JPS62135071A - Trimming machine for printing plate making - Google Patents

Abstract

PURPOSE:To improve the efficiency of trimming lay-out work and to make the machine smaller in size by calculating the trimming data of an original based on the inputs from a data tablet, an input unit and a position detector with the center-position data of a projected image for reference. CONSTITUTION:When the positional signals of two points (l) and (m) are inputted from a rotary encoder 34 and a linear encoder 35 to an arithmetic and control unit 20, the unit 20 starts the arithmetic operation, and calculates the center-position data of the projected image I based on the positional data of the two points L and M on the data tablet 11. From this center-position data, respective points A-D on the tablet 11, and the positional data of the two points (l) and (m) on a scanner-scanning drum 31, the positional data of respective points (a)-(d) are calculated as the trimming data. Thereafter, the unit 20 controls the drum 31 to rotate to read the picture data of the original F from a scanning head 32, and controls so that only the picture data within a trimming range is stored in an external storage device 21.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a device for reading image data that has been trimmed by a scanner in printing plate making.

(Prior Art) In recent years, layout systems in which a computer is used to perform layout work necessary for printing plate making have come into widespread use. In such a system, a rotating drum-shaped scanner is used to read image data from a document, and the read image data is temporarily stored in a memory such as a magnetic disk pack in preparation for subsequent processing. It was like that.

By the way, the above-mentioned layout work is performed by trimming only the necessary range of the document surface and specifying the position on the image surface of one page. Retrieve the image data that has been imported into the computer and display it on the display, move the cursor image representing the trimming range and the image of the document arbitrarily on the display screen, and place the image of the document at the position specified on the layout designation sheet. The method used was to incorporate the elements one by one.

(Problems with the prior art) However, in this conventional method, since the image data of the document is read without trimming, a large amount of unnecessary image data is read, and a large storage capacity is required. The positioning work requires skill and time, and it is easy to make errors in positioning, making accurate layout difficult, and the system tends to be expensive because it requires a display device with special functions for layout. There was a drawback.

Separately, when reading a document with a scanner, the dimensions of the portion of the document to be trimmed are measured in advance, taking into account the magnification ratio of the scanner, and this dimension data is input to the keyboard, etc. at the position to be trimmed on the scanner. A method is also known in which image data is read after being specified. However, this method has the disadvantage that it requires a great deal of skill and time to measure dimensions and specify positions.

(Purpose of the invention)
.

The present invention was made in view of the above problems, and instead of trimming the image of the original on the display,
To provide a device that efficiently and quickly creates trimming data before a scanner reads an image of a document, and allows the scanner to read image data trimmed based on the trimming data.

(Summary of the Invention) To achieve this object, the present invention provides a projection device that projects an image of a document onto a specified layout sheet at a desired magnification ratio, and a position indicating the area and trimming range of the image projected on the specified layout sheet. a data tablet for inputting data; an input device for inputting the magnification; a position detection device for detecting the position of the document set on a scanner drum; an arithmetic control device that calculates center position data of the projected image based on an input and calculates trimming data of the document using the center position data as a reference; A trimming device for printing plate making is provided, which includes a scanner that performs trimming and reading, and a storage device that stores image data read by the scanner.

(Example) Embodiments of the present invention will be described below based on open planes.

FIG. 1 is an external view showing an example of a trimming device for printing plate making according to the present invention. In the figure, 1 represents a magnification measuring device, 2 is a workbench, 3 is a column, 4 is a projection lens, 5 is a document holder, 6 is a lamp house, 10 is a magnification display, 11 is a data tablet, 12 is a cursor, 13 is the menu, 2
0 is an arithmetic control unit, 21 is an external storage device, 22 is a keyboard, 23 is a switch, 31 is a scanner scanning drum, 3
2 is a scanning head, 33 is a magnifying glass, 34 is a rotary encoder, and 35 is a linear encoder. Arithmetic control bag W2
0 has a magnification measuring device 1, an external storage device 21, and a keyboard 2.
2, a switch 23, a scanning end 32, a rotary encoder 34, and a linear encoder 35 are connected.

Note that F is a document, B is a designated layout sheet, and ■ is a projected image of the document F set in the document holder 5.

A holder holding member 7 for setting the document holder 5 is provided at the bottom of the lamp house 6, and further below the holder holding member 7, a projection lens 4 fixedly supported by a support member 9 is arranged, and the holder holding member 7 and the support member 9 The space between them is covered with a bellows-shaped protective cover 8. The lamp house 6 and the support member 9 are movably supported by the support column 3, and a data tablet 11 is embedded in the surface of the workbench 2. The layout designation sheet B is placed on the surface of the data tablet 11. Therefore, the document F placed in the document holder 5 is illuminated by a light source provided in the lamp house 6 through an appropriate condenser lens, and a projected image of the image ■ is projected onto the surface of the assigned sheet B. It has become so.

Since the projection lens 4, document holder 5, and lamp house 6 can be moved up and down along the support 3, they can be moved up and down by operating a switch on the operation control panel (not shown) of the magnification measuring device 1. As a result, it is possible to form a projection image ■, which is an image of the document F reduced or enlarged to an arbitrary size over a predetermined range, on the surface of the designated layout paper B, and at this time, the projection lens 4 and the designated layout paper A magnification is calculated by taking in the distance between B using a linear encoder or the like and performing arithmetic processing, and the value is displayed on the magnification display 10.

Therefore, if you set the original F in the original holder 5 and match its projected image ■ with the figure drawn on the designated layout sheet B, the magnification will be automatically displayed on the magnification display 10 and you can measure the magnification. It can be terminated. Note that such an automatic magnification measuring device is well known.

The scanner scanning head 32 is disposed near the circumferential surface of the scanner scanning drum 31 and is configured to read image data of the document F set on the scanning drum 31 and input it to the arithmetic and control unit 20 . This input image data of the original document F is recorded in the external storage device 21. The rotary encoder 34 is connected to the rotating shaft of the scanner scanning drum 31, and the linear encoder 35 is connected to a magnifying glass disposed near the circumferential surface of the scanner scanning drum 31. Also,
This magnifying glass is movable in the axial direction of the scanner scanning drum 31. Therefore, by moving the magnifying glass, rotating the scanner scanning drum 31, and positioning a desired point on the document F directly below the magnifying glass 33, the position of the desired point on the document F on the scanner scanning drum is lowered. It can be detected by the clear encoder 34 and the linear encoder 35.

Next, the operation will be explained.

First, after storing the document holder 5 with the document F in the holder holding member 7, the layout designation paper B is placed at a predetermined position on the workbench 2 in which the digitizer 11 is embedded.

Next, the image of the original F is projected onto the designated layout sheet B, and a switch on the operation control panel (not shown) of the magnification measuring device 1 is operated to make the projected image I of the original F and the designated layout sheet B. Match the stopper types. At this time, the magnification value of the document F is displayed on the magnification display 10.

Next, the position data of the image area of the projection image I and the position data of the trimming range are input using the cursor 12, and the magnification ratio is input.

FIG. 2 shows the state of the projected image (■) on the layout designation paper B. In the figure, E is the stopper shape drawn on the layout designation paper B, and the coordinate values of the four vertices A, B, C, 017) of the stopper shape E are 4(XI, Yl), (X2.Y2), (X3), respectively. .Y3)
, (X4.Y4), and the two diagonal vertices of the projected image ■, M
(7) Set the coordinate values to 4 each (X5.Y5), (X6.Y6)
, the projected image ■ coincides with the plug shape E, and the position data of the image area of the projected image ■ is input by inputting two points and the coordinate value of M using the cursor 12, and the trimming range is The input of the position data is the 4 vertices A, B, C of the stopper type E.
, D using the cursor 12. The magnification can be changed manually by inputting the coordinate values of This is performed by inputting information using a keyboard 22 connected to the control device 20. Moreover, the input of this magnification ratio may be performed by directly inputting a signal from a linear encoder for magnification measurement provided in the magnification measuring device 1 to the arithmetic and control device 20 .

Next, the document F is removed from the document holder 5 and pasted onto a predetermined position on the scanner scanning drum 31, and the positional data of the document F on the scanner scanning drum 31 is input to the arithmetic and control unit 20.

FIG. 3 shows the state of the document F on the scanner scanning drum 31. In the figure, 1 and m are original PiF
The coordinate values on the scanner drum are (x5.V5) and (x6.y6), respectively.

Further, a, b, c, and d indicate the four vertices of the trimming range of the document F shown by broken lines, and their coordinate values on the scanner scanning drum are (xl, yl), (x2.y2), (x3), respectively.
．． y3) and (x4.y4). The position data of the original F on the scanner scanning drum 31 is input using the magnifying glass 33.
This is done by moving the drum 31 and aligning the points l and m of the document F with the center position of the magnifying glass 33, and operating the switch 23 when -it is reached. With this operation, two points 1. The position signal of m is sent to the arithmetic and control unit 2.
It will be input as 0.

When the desired data is input to the arithmetic and control device 20 in this way, the arithmetic and control device 20 starts calculations and creates a projected image based on the positional data of the two points M on the data tablet 11! Calculate the center position data of, and use this center position data,
Each point A, B, C, D on the data tablet 11 and the two points 1. on the scanner scanning drum 31. From the position data of m, position data of each point a, b, c, and d shown in FIG. 3 is calculated as trimming data. Next, the arithmetic and control unit 2
0 rotates the scanner scanning drum 31, reads the image data of the original F from the scanning head 32 based on the above trimming data, and only the image data within the trimming range is stored in the external storage device 21.

FIG. 4 is a flowchart showing the processing in the arithmetic and control unit 20.

First, by operating the cursor 12 as described above, the position data of the two points of the projection image ■, M, and the coordinate values of the four vertices ASB, C, and D of the calibration E are input (S
l). Next, the magnification ratio of the original F is input by operating the cursor 12 or the keyboard 22 (S2
). Next, two points 1 of the document F on the scanner scanning drum 31 are transferred from the row encoder 34 and the linear encoder 35.
Position data of t and m is input (S3).

When these inputs are completed, the center position data of the projected image I is calculated (S4).The center position data is calculated by using the coordinates (XO, YO) of the midpoint P of the two points shown in Fig. 2. This is done by calculating. (S4). , :,, :”t
”The coordinate value of p (XO,'IQ) is XO= (X6-X5
) /2 YO= (Y6-v5) /2 is expressed.

Next, position data of points a, b, c, and d shown in FIG. 3 are calculated as trimming data (S5).

At this time, 2 points 1. If the midpoint of m is p and its coordinate values on the scanner scanning drum 31 are (xo, yO), then xo=(x6 x5)/2 yo=(y6 y5)/2. Therefore, the coordinate values (xi, yl) of a are xl = xo-((
XO-XI) / Ct]yl=yO-C(YO-Yl
) /α]. Similarly, the coordinate values of s, c, d (x2.y2), (x3.y3), (x4.y4
) is calculated.

When the calculation of trimming data is completed in this way,
The image data of the document F is read by rotating the scanner scanning drum 31 (S6). This image data is read from the portions surrounded by broken lines with a, b, c, and d as vertices in FIG. This is done by the scanning head 32 reading the image. The image data read by the scanning head 32 is sequentially stored in the external storage device 21 (S7).

The image data stored in the external storage device 21 is output to an exposed film placed on an exposure drum (not shown) disposed to read the image data, and this exposed film is used as a printing film original plate.

(Effects of the Invention) As described above, in the present invention, position data is input from a data tablet provided on the projection table of the document when measuring the magnification of the document, which is performed prior to the color separation work of the scanner, and the position data is inputted at this time. The trimming data is calculated by simply inputting the magnification ratio and positioning the document using a magnifying glass when the document is set on the scanning drum of the scanner, and only the image data of the document within the trimming range can be read. In addition to being able to complete the import of all the data necessary for layout, trimming layout work that previously required skill and time can be done extremely quickly and efficiently. No special display device is required,
Furthermore, since only the necessary image data is read, the image storage device does not need to be enlarged, and a rotary drum scanner, which has been widely used in the past, can be used as the scanning section for reading image signals from the original. Since no special reading/scanning unit is required, the device is less expensive.

[Brief explanation of drawings]

Fig. 1 is an external view showing an example of the trimming device for printing plate making of the present invention, and Fig. 2 is a projected image on the layout designated paper B! 3 is an explanatory diagram showing the state of the document F on the scanner scanning drum 31, and FIG. 4 is a flowchart showing the processing in the arithmetic and control unit 20. 1... Magnification measuring device 2... Workbench 3... Support 4... Projection lens 5... Document holder 6... Lamp house 10... Magnification display 11... Data tablet 12 ...Cursor 13...Menu 20...Arithmetic M control device 21...External storage device 22...Keyboard 23...Switch 31...Scanner scanning drum 32...Scanning head 33...・Magnifying glass 34...Rotary encoder 35...Linear encoder B...Layout designation sheet F...Manuscript ■...Projected image Patent applicant Dai Nippon Printing Co., Ltd. Agent Patent attorney Atsumi Konishi Figure 3 Figure 4

Claims (1)

[Claims] A projection device that projects an image of a document onto a designated layout sheet at a desired scaling factor, a data tablet that inputs position data indicating an area and a trimming range of the image projected onto the designated layout sheet, and inputs the scaling factor. an input device for
a position detection device that detects the position of the document set on a scanner drum; and a position detection device that calculates center position data of the projected image based on inputs from the data tablet, the input device, and the position detection device; an arithmetic and control device that calculates trimming data of the document based on the arithmetic and control device; a scanner that trims and reads the image data of the document based on the calculation results of the arithmetic and control device; and a memory that stores the image data read by the scanner. A trimming device for printing plate making, characterized in that it is equipped with a trimming device.