JPH0452936B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for correctly loading a document onto a scanning drum in a scanner for printing plate making as specified, and particularly relates to a device for correctly loading a document onto a scanning drum as specified. This invention relates to an angle setting device that allows accurate and easy angle setting.

In color separation work using a scanner for printing plate making, it is necessary to attach a color original such as a color film to the scanning drum of the scanner. At this time, the angle at which the color original is attached to the scanning drum is determined by Must be set correctly as specified.

Setting the angle at which the document is pasted is generally referred to as angle setting, but conventionally, this angle setting has relied entirely on the operator's visual estimation. In other words, the angle of inclination of the figure drawn on the block mount is measured with a protractor, etc., and based on that measurement, the angle of the manuscript is determined in the same way with a protractor, etc.
It was attached to the scanning drum.

However, this visual measurement method requires skill, is inefficient, has low accuracy, is difficult to maintain, and is prone to scratches on the surface of the scanning drum.

By the way, one of the pre-processing steps required prior to color separation using a scanner, like this angle adjustment, is a so-called magnification measurement operation, and a device called a magnification measuring machine is widely used for this purpose.

Therefore, a method of performing angle adjustment using this magnification measuring machine was proposed a long time ago, and has become widely adopted.

However, there are two types of this method,
One is a method that uses the function of the magnification measuring machine as it is, and the other is a method that adds auxiliary equipment to it and uses it.First, an example of the former will be explained using Figures 1 to 4. do.

The original is set on a magnification measuring machine, and the projected image I of the original is made to match the corresponding image on the master mount B (FIG. 1) to measure the magnification. At this time, the master mount B is kept fixed at a fixed position, and only the projected image I of the original is rotated to match it.

Two lines L orthogonal to each other are hand-drawn on the block mount B in alignment with the frame (edge) of the projected image I of the original image (FIG. 2).

Remove the original F that has been set in the magnification measuring machine, place it on the block mount B, align the edges of the document F with the two handwritten lines L drawn on the block mount B, In this state, a mark M indicating the horizontal position is handwritten on the edge of the document F (FIG. 3).

Using a grid film S or the like, paste the original F onto the scanning drum D of the scanner at a predetermined position so that the horizontal mark M on the original is parallel to the horizontal reference line G of the drum D (Fig. 4). ).

However, as described above, this method involves most of the manual work, resulting in poor working efficiency, and also has the following drawbacks.

(b) It is difficult to maintain accuracy, which requires careful work.

(b) It is necessary to mark directly on the original film, which causes problems in managing the original, and there is a risk of dust adhesion and damage.

(c) It is necessary to draw a reference line on the block mount (or a copy thereof), which increases the number of man-hours.

(d) Extra grid film, etc. is required, and handling thereof requires extra effort.

Next, an example of the latter method using an auxiliary device will be explained with reference to FIGS. A square ruler is provided that is movable and can be rotated to any angle.
This is used to adjust the angle of the original, and the process is as follows. In addition, a magnification measuring machine equipped with such auxiliary equipment,
For example, it is known under the trade name "Scan Mount" (manufactured by Dainippon Screen Co., Ltd.).

Attach the block mount B to the right angle ruler T with pins, etc., place it on the block mount mounting table, project the image I of the original image onto it, and match the pattern on the block mount B and the original image I. let At this time, without moving the original, move the block base B together with the square ruler T to change its position and angle so that they match (Fig. 5).

While keeping the square ruler T stationary, remove the document F along with its holder H, press it against the reference surface of the square ruler T, and in this state stick the document F to the square ruler T with tape or the like. (Figure 6).

The square ruler T with the original F pasted thereon is moved onto the transparent film M without changing its angle, and the original F is replaced with the film M (FIG. 7).

The film M to which the original F is pasted is wound around the scanning drum D of the scanner, and the original F and film M are attached to the scanning drum D together (FIG. 8).

Although this method eliminates the need for marking work on the mount and manuscript, it still requires a considerable amount of manual labor and has the following drawbacks.

(b) Since it must be attached to a right-angle ruler, it is difficult to maintain accuracy using a thin paper mount, making it difficult to use for copying, and it is usually supplied drawn on cardboard. The original stencil must be used as is, making it difficult to maintain its quality.

(b) Similarly, punch holes are required on the stencil mount, which changes the stencil mount.

(c) Skill is required to maintain accuracy.

(d) There is a lot of pasting and replacing of originals, which can easily damage them.

SUMMARY OF THE INVENTION An object of the present invention is to provide a low-cost angle setting device that eliminates the drawbacks of the prior art described above and allows highly accurate angle setting to be easily performed without requiring any skill.

In order to achieve this object, the present invention is characterized in that the reference line and original pasting line necessary for angle adjustment are automatically drawn on the transparent film as a result of the magnification measurement operation using a magnification measuring device. shall be.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The scanner document angle setting device according to the present invention will be described in detail below with reference to illustrated embodiments.

FIG. 9 is an external view showing one embodiment of the present invention.
2 represents the entire scanner document angle setting device, 2 is a workbench, 3 is a support, 4 is a projection lens, and 5
is a document holder, 6 is a lamp house, 7 is an operation control panel, 8 is a magnification display, 9 is an X-Y plotter, 10
is an angle indicator. Incidentally, B represents a copy mount, and I represents a projected image of the original.

The workbench 2 has a workpiece mount B placed on its surface so that work such as magnification measurement can be carried out efficiently, and it also functions as a stand for the entire apparatus.

The projection lens 4, the original holder 5, and the lamp house 6 are held together by the support 3, and the magnification measurement is performed using the surface of the copy mount B placed on the workbench 2 as the projection surface of the image of the original. The original placed in the original holder 5 is illuminated by a light source installed in the lamp house 6 through a suitable condenser lens, and the projected image I of the image is projected onto the printing plate. It is designed to be projected onto the surface of B. Further, the projection lens 4, the original holding part 5, and the lamp house 6 are configured to be movable up and down along the support 3, and are moved up and down by operating a switch on the operation control panel 7. A projection image I obtained by reducing or enlarging the image to an arbitrary size over a predetermined range can be formed on the surface of the block base B. Then, the distance between the projection lens 3 and the copy mount B and the distance between the document and the original are taken in by a linear encoder or the like, and the magnification is calculated by calculation and displayed on the magnification display 8. It's getting old.

Therefore, if you set the original, create its projected image I on the surface of the block mount B, and match it with the figure drawn on the block mount B, the magnification will automatically change to the magnification indicator 8. is obtained, and the magnification measurement can be completed. Note that such an automatic magnification measuring device is well known.

FIG. 10 is an enlarged view of the central part of the original holder 5, in which a shows the front view and b shows the side view. It is designed so that it can be inserted into and removed from a holding part 62 which has a U-shaped side surface and is provided inside, and contains document scissors 51, rotary encoder 52, etc. on the outside. An adjustment knob 53 protrudes.

FIG. 11 is a diagram showing the inside of the document holder 5.
A is a side sectional view, b is a view of a part of the interior seen from below, and FIG. The ring-shaped rotating frame 54 is rotatably held by the round hole 5b of the partition plate 5a of the document holder 5, and a gear portion 54a formed on the lower outer circumference thereof is connected to the shaft of the rotary encoder 52. The attached gear 52a and the gear 53a attached to the shaft of the knob 53 mesh with each other. Therefore, when the knob 53 is rotated, the rotation frame 5 is rotated through the gear 53a and the gear portion 54a.
4 rotates, and the rotation is further transmitted to the rotary encoder 52 via the gear 52a, and data representing the rotation angle of the rotation frame 54 is extracted as an electrical signal.

The document scissors 51, as shown in FIG. 13, are made by connecting two transparent plates 51a and 51b made of glass or plastic plates with a hinge, between which a document F such as a color film is held. It functions to hold it in the rotating frame 54 while holding it in a flat surface.

Therefore, the document F is held in the document holder 5, set in the holding part 62 at the bottom of the lamp house as shown in FIG. By projecting the image onto the surface of the image, the image I can be rotated to any desired angle by adjusting the knob 53, and the resulting angle can be input to the internal calculation section as an electrical signal.

FIG. 14 is a diagram showing an embodiment of a processing system for signals from the rotary encoder 52. Data given from the rotary encoder 52 is input to the calculation unit 12 via the signal input unit 11. At this time, the acquisition of data by the calculation unit 12 and the start of calculation processing are controlled by push button switches etc. provided on the operation control panel 7.
A drive signal is outputted to the X-Y plotter 9, a display signal is outputted to the angle indicator 10, etc.

Next, the operation of determining the angle according to this embodiment will be explained.

Place the original mount B (or a copy thereof) on the workbench 2, and at the same time set the original F such as color film in the original holder 5, and place the original image I on the surface of the original mount B. to be projected.

A magnification adjustment switch provided on the operation control panel 7 is operated to match the design of the original image I with the layout designation graphic drawn on the block mount B. Incidentally, the matching of the positions at this time is performed by shifting the master mount B on the workbench 2.

After completing the above operations, the magnification display switch on the operation control panel 7 is operated, and the magnification at that time is displayed on the magnification display 8.

As already explained, these operations are almost the same as in the case of a known magnification measuring machine, and therefore, the following operations are not necessary for documents that do not require angle adjustment.

Once the pattern matches and the magnification is determined, next operate the knob 53 to rotate the image I so that the horizontal and vertical edges of the image I match the horizontal and vertical specified lines on the block mount B. In this state, the reference angle setting switch on the operation control panel 7 is pressed, and the data given by the rotary encoder 52 at this time is taken into the calculation unit 12 as reference angle data.

The knob 53 is operated again to rotate the image I, and the design of the image I is again made to match the designated figure drawn on the stencil mount B. Then, in this state, the angle calculation switch on the operation control panel 7 is pressed to cause the data obtained by the rotary encoder 52 at this time to be taken into the calculation section 12 as measured angle data.

When the reference angle data and the measurement angle data are inputted in this way, the calculation unit 12 starts processing these data at this point, calculates rotation angle data representing the rotation angle of the document, and calculates the rotation angle data representing the rotation angle of the document. It is displayed on the angle display 10 and stored in the memory.

Here, when the gauge output switch on the operation control panel 7 is operated, the data from the memory is
The signal is sent to the control circuit of the Y plotter 9, thereby starting the graphic output operation by the X-Y plotter 9, and a hard copy on which a predetermined angle indicating gauge graphic is drawn is completed.

FIG. 15 shows an example of a hard copy output from the X-Y plotter 9. In the figure, P is a transparent film base such as polyester film,
R, A, and U are each drawn on the base and are straight lines, and R
is a reference line, A is an angle designation line, and U is an orthogonal line.
Incidentally, an X-Y plotter that outputs a hard copy of a figure based on such a transparent film is well known.

In this way, the transparent hard copy as shown in FIG. 15 outputted from the X-Y plotter 9 is as follows.
It is called an angle indicating gauge and is represented by Q.

Next, the method of determining the angle of a document using this angle instruction data Q will be explained with reference to FIG.

(a) Scan the reference line R of the angle indication gauge Q on the drum D.
In this state, only the upper end of the angle indicating gauge Q is attached to the scanning drum D.

(b) Place the original F under the angle indicator Q, place it on the surface of the scanning drum D, and align the edge of the original F with the angle indicator line A and the orthogonal line U drawn on the angle indicator Q. Perform positioning and angle adjustment.

(c) While keeping the original F in place, adhere the original F to the surface of the scanning drum D using adhesive tape or the like, remove the angle indicating gauge Q, and complete the angle setting of the original F.

Therefore, according to this embodiment, there is no need to draw any instruction lines or marks by hand, which simplifies the work, and because there is no risk of deterioration in accuracy due to handwriting, highly accurate angle determination can be easily performed. be able to.

1 Furthermore, according to this embodiment, there is no need to replace the original F at all, so there is almost no risk that the original F will be soiled or damaged, and the original mount B
Since there is no need to make holes in the material, it is possible to work by copying it.

By the way, in the above embodiment, as explained in FIG. 16, when pasting the original F onto the scanning drum D using the angle indicating gauge Q, this gauge Q is removed after pasting is completed. As explained above, the original F is affixed to the angle indicator gauge Q in advance using the angle indicator line A and the orthogonal line U, and then the gauge Q to which the original F is affixed is attached to the scanning drum D. , the reference lines R and G may be affixed so that they match, and the reading scan may be performed without removing the gauge Q.

In addition, this angle indication gauge Q is connected to the angle indication line A drawn on it, the orthogonal line U, and the reference line R.
Needless to say, if these lines are no longer needed, they can be used repeatedly by erasing them with a solvent or the like. Also, the orthogonal line U among the lines drawn on this angle indicator gauge Q is only provided for the convenience of positioning the document F, and has no direct relation to setting the angle, so this orthogonal line U is not necessary. Needless to say, the drawing may be omitted if necessary.

As explained above, according to the present invention, it is possible to automatically obtain the gauge necessary for angle determination with almost the same work as measuring the magnification of the original, without the need for handwriting or re-pasting the original. ,
A document angle setting for scanners that eliminates the shortcomings of the conventional technology, allows high-precision angle adjustment while minimizing deterioration in the quality of the document and plate mount, and provides the excellent effects listed below. The device can be easily provided.

(1) An angle indicator gauge that clearly indicates the pasting angle is automatically obtained, and the angle of the document can be determined using this gauge, so accuracy and work efficiency are greatly improved.

(2) Angle measurement is performed simply by matching figures, requiring no skill at all, and is easy to operate.

(3) It can be integrated with a magnification measuring machine, does not require extra space, and can perform angle measurement at the same time as magnification measurement.

(4) The drawn and output angle indication gauge can be used repeatedly by performing drawing line erasing processing, which is economical.

[Brief explanation of the drawing]

Figures 1 to 4 are explanatory diagrams showing an example of the conventionally used angle adjustment work, and Figures 5 to 8 are explanatory diagrams showing another example of the conventional angle adjustment work. 9 is a perspective view showing an embodiment of the scanner document angle setting device according to the present invention, FIGS. 10a and 10b are enlarged views showing a part of the embodiment centering on the document holder, and FIG. Figures a and b are detailed explanatory views of the document holder, 12th
The figure also shows an exploded view of the original holder, Fig. 13 is a perspective view showing an example of the original scissors, Fig. 14 is a block diagram showing one embodiment of the signal processing system, and Fig. 15 shows an implementation of the angle indicator gauge. An explanatory diagram showing an example, FIG. 16 is an explanatory diagram of a document pasting operation using an angle indicating gauge according to an embodiment of the present invention. 2...Work table, 5...Document holder, 7...Operation control panel, 8...Magnification display, 9...X-Y plotter, 10...Angle display, 51...Document scissors,
52... Rotary encoder, 53... Knob for rotating the document, 54... Rotating frame.

Claims (1)

[Scope of Claims] 1. In a document angle setting device for a scanner, which sets the angle of a document by matching an optically projected image of a document pattern with a layout designation figure based on a plate mount, an optical system for projecting a document pattern image is provided. a rotation angle detection means that generates an electrical signal representing the rotation angle from a predetermined angular position of the document with the optical axis of the original as the rotation axis; and a graphic drawing means that outputs a hard copy based on the electrically input data. and operating the graphic drawing means based on the angle data calculated from the electrical signal to obtain a hard copy graphic for determining the document mounting angle for the scanner. Setting device. 2. The document angle setting device for a scanner according to claim 1, wherein the rotation angle determining means is constituted by a rotary encoder that detects the rotation angle of the document holder within the document surface. 3. A document angle setting device for a scanner according to claim 1, wherein the graphic drawing means is constituted by an X-Y plotter. 4. The document angle setting device for a scanner according to claim 1, wherein the hard copy figure is constructed based on a transparent film. 5. A document angle setting device for a scanner according to claim 1, characterized in that at least one of an analog display and a digital display for inputting the angle data is provided. 6. The document angle setting device for a scanner according to claim 1, wherein the optical system for projecting a picture image of the document is configured to be used in common with a magnification measuring device for a scanner.