JP3619232B2 - Printing plate pasting method and apparatus - Google Patents

Description

[0001]
[Field of the Invention]
The present invention relates to production of a printing plate in which a plate is bonded to a mount film. In particular, the present invention relates to a method and apparatus for quickly and accurately aligning and attaching a plate to a mount film.
[0002]
[Prior art]
When performing multicolor printing on a sheet for a cardboard box, a plurality of printing plates having convex surfaces corresponding to the respective colors are required.
As shown in FIG. 5, the printing plate (1) is formed by bonding the plate (18) to the mount film (11), but the plate (18) is accurately positioned with respect to the mount film (11). If there is no print, a deviation occurs between adjacent colors when printing is performed, and printing reproduction that is faithful to the original drawing cannot be performed, or a color loss portion occurs.
[0003]
The applicant has previously proposed an apparatus for accurately positioning and sticking the plate (18) to the mount film (11) as shown in FIG. 7 (Patent Document 1).
The apparatus includes a work table (3), a plurality of cameras (4) (41) (42) movable in a horizontal plane above the work table, and a plurality of monitors (5) (51) corresponding to each camera. ) (52).
[0004]
A plurality of mount films (11) provided with a plurality of first alignment marks (81) (81) (81) are set at predetermined positions on the work table (3) and are arranged above the work table (3). Each camera (4) is moved to a position just above each first alignment mark (81) of the mount film (11), and the first alignment mark (81) is monitored as an image first alignment mark (81a). (5) Display in (51) and (52).
On the screens of the monitors (5), (51), and (52), a cross-shaped alignment mark (80) is displayed at a fixed position separately from the first image alignment mark (81a). The camera position is manipulated to align the first image mark (81a) on the monitor with the fixed alignment mark (80).
In FIG. 7, the right monitor (5) is in a state where the positions of the fixed alignment mark (80) and the first image alignment mark (81a) match, and the other two monitors (51) and (52) are fixed alignment marks ( 80) and the position of the first image alignment mark (81a) do not match.
[0005]
On all the monitors (5) (51) (52), the positions of the fixed alignment mark (80) and the first image alignment mark (81a) are matched, and then the plate (18) is mounted on the mount film (11). The second alignment mark (82) of the plate (18) is captured by the cameras (4) (41) (42), and the image second alignment mark (82a) (82a) ( 82a) (82a).
While looking at the fixed alignment marks (80), (80), and (80) on the monitors (5), (51), and (52), the operator moves the plate (18) on the mount film (11) to display the second alignment image. The marks (82a) (82a) (82a) are aligned with the fixed alignment marks (80) (80) (80).
When the position of the plate (18) is determined, the plate (18) is attached to the mount film (11) to complete the printing plate (1).
[0006]
[Problems to be solved by the invention]
In the plate pasting device, each camera (4) (41) (42) is slidably moved in the X-axis direction, which is the longitudinal direction of the work table (3), on the rails (43) (44) (45). The work table (3) is arranged so as to be slidable in the Y-axis direction, which is the short direction of the work table (3), and the camera (4) (41) (42) is moved in the XY-axis direction by power drive or manually. Can do.
However, when the cameras (4), (41), and (42) are moved by power drive, they run with respect to the individual rails (43), (44), and (45) and the individual camera cameras (4), (41), and (42). A driving device is required, and a collision prevention device between rails is also required, so that the pasting device becomes complicated and large.
Also in power drive, since the operator operates to determine the stop position of the cameras (4) (41) (42), skill is required for the operation.
[0007]
When the cameras (4), (41), and (42) are moved manually, the rails (43), (44), and (45) must be moved in the X-axis direction, which requires a lot of labor.
The rails (43), (44), and (45) must be high enough not to interfere with the worker who works standing up, but the cameras (4), (41), and (42) are placed on the back side of the rail. When moving to, the work table (3) may get in the way and the operator's hand may not reach. In this case, it is difficult to align the camera with the first alignment mark (81) of the mount film (11) by using a stepladder or forcibly working on the work table (3). Also, it takes time and effort.
[0008]
Regardless of whether the camera is positioned for power or manual driving, if the moving speed of the camera (4) is increased, the fixed mark (80) on the monitor (5) is printed. It becomes difficult to align the image first alignment mark (81a) of (18). Therefore, the camera (4) must be moved at a low speed, and there is a problem that the work efficiency of the alignment is extremely bad. .
The present invention clarifies a plate attaching method and apparatus that can solve the above-mentioned problems all at once.
[0009]
[Patent Document 1]
Japanese Patent Application No. 2001-179940
[Means for Solving the Problems]
The plate pasting apparatus of the present invention includes a work table (3) for pasting the plate (18) to the mount film (11),
A transparent plate (6) arranged to be movable up and down above the work table (3);
A plurality of cameras (4), (41), (42) placed freely above the transparent plate (6) with the lens facing downward;
Monitors (5) (51) (52) for displaying images of signals from the cameras (4) (41) (42);
A mark corresponding to the first alignment mark (81) of the mount film (11) is stored in advance, and the stored alignment mark (8) is moved on the monitor (5) (51) (52). A computer (7) having image matching means for aligning with the image first alignment mark (81a) captured by the cameras (4) (41) (42);
A transparent plate ( 6 ) arranged to be movable up and down above the work table ( 3 ) ;
The plurality of cameras ( 4 ), (41), and (42) are placed on the transparent plate ( 6 ) so that they can be freely moved manually by the operator.
[0011]
The method of attaching the plate of the present invention is as follows:
The plurality of second alignment marks (82) formed on the plate (18) are aligned with the plurality of first alignment marks (81) formed on the mount film (11), and the plate (18 )
Mounting the mount film (11) on the work table (3);
The transparent plate (6) arranged so as to be movable up and down above the work table (3) is lowered until it approaches the mount film (11), and a plurality of cameras (4) (41) (42) are placed on the transparent plate (6). ) and placed by located near the operator manually mounts the film (11) on the first Go mark (81) step,
The process of raising the transparent plate (6) together with the camera to a height where the focus of the camera lens matches the mount film (11);
The first alignment mark (81) of the mount film (11) captured by the camera (4) is stored in the computer (7) in advance on the monitor (5) displayed as the image first alignment mark (81a). The stored registration mark (8) is moved by the image matching means of the computer (7) and superimposed on the image first registration mark (81a), and the other first registration mark (81) (81) of the plate (18). Similarly, the step of aligning the memory alignment mark (8) (8) with the first image alignment mark (81a) (81a) on the monitor (51) (52),
The plate (18) is placed on the mount film (11), the second alignment mark (82) of the plate (18) is captured by the cameras (4) (41) (42), and the image second alignment mark (82a) (82a ) (82a) is displayed on the monitor (5), and the mount film (11) while viewing each memory alignment mark (8) (8) (8) and the second image alignment mark (82a) (82a) (82a) Correcting the position of the plate (18) and aligning each image second alignment mark (82a) (82a) (82a) with the corresponding storage alignment mark (8) (8) (8);
A process of attaching the aligned plate (18) to the mount film (11),
including.
[0012]
[Action and effect]
When the cameras (4) (41) (42) are moved to the first alignment marks (81) of the mount film (11) on the work table (3), the movement is performed on the transparent plate (6) at the lowered position. , The operator can work easily in a sufficiently reachable position.
The cameras (4), (41), and (42) do not need to be placed directly above the first alignment mark (81) of the mount film (11), and the cameras (4), (41), and (42) correspond. Any position can be used as long as it captures the first mark (81) and can be displayed on the monitor (5) (51) (52) as the first image mark (81a) (81a) (81a). Yes.
[0013]
The seemingly inefficient means of manually moving the cameras (4), (41) and (42) on the transparent plate (6) is also the target that is the first alignment mark (81) on the mount film (11). Since the cameras (4), (41), and (42) need only be roughly registered with respect to the position, the placement efficiency of the cameras (4), (41), and (42) is the same as that of the conventional apparatus and the conventional method of FIG. As described above, the lens center of the cameras (4), (41), and (42) is accurately positioned at a position directly above each first alignment mark (81) on the mount film (11). Can be done.
According to the method of the present invention, when only the time required for positioning the plate (18) on the mount film (11) is compared with the case of using the conventional apparatus of FIG. Thus, it can greatly contribute to shortening the manufacturing time of the entire printing plate (1).
This is also stored in the computer (7) in advance on the monitors (5) (51) (52) which display the first alignment mark (81) of the mount film (11) as the image first alignment mark (81a). This was realized by superimposing the stored memory mark (8) on the first image mark (81a) by the image matching means of the computer (7).
[0014]
Further, as in the conventional apparatus of FIG. 7, the cameras (4) (41) (42) are moved in the Y-axis direction on a plurality of rails (43) (44) (45) that slide in the X-axis direction. In the present invention, the camera (4), (41), and (42) can be simply placed on the transparent plate (6) that moves up and down as compared with the case of making it possible to simplify the configuration of the apparatus.
[0015]
Embodiment
FIG. 5 shows the printing plate (1), which is configured by attaching the plate (18) to the mount film (11).
The length L in the short direction of the mount film (11) corresponds to the circumference of a plate cylinder (not shown) of a corrugated cardboard printing apparatus on which the printing plate (1) is wound and mounted.
A terminal rod (12) is fixed to one side edge in the longitudinal direction of the mount film (11), and two positioning holes (14) and (15) are opened close to the terminal rod (12).
[0016]
As shown in FIG. 1, the mount film (11) is preliminarily drawn with a development view (16) of the cardboard box and three first alignment marks (81) for alignment when the plate (18) is attached. It is.
[0017]
As shown in FIGS. 1 and 5, the plate (18) has elasticity formed by a known method using an ultraviolet curable resin, and has a land portion (18b) on a rectangular base sheet (18a). And the convex marking surface (18c) is formed on this land part (18b).
On the plate (18), three second alignment marks (82) are three-dimensionally formed so as to be able to overlap each first alignment mark (81) of the mount film (11). Each second alignment mark (82) is formed lower than the convex marking surface (18c) in order to prevent adhesion of ink.
The plate (18) is provided with an adhesive layer on the entire back surface, and the adhesive layer is covered with a release paper that can be divided into a plurality of pieces.
[0018]
The plate (1) requires the number of inks used for multicolor printing, and the shape and position of the convex surface (18c) of the plate (18) of each plate depends on the color of the ink. Of course, the positions of the second alignment marks (82), (82), and (82) of the plate (18) are common.
[0019]
FIG. 1 shows an attaching device (2) for aligning and attaching the plate (18) to the mount film (11).
The work table (3) for attaching the plate (18) has a large number of small-diameter suction holes (33) regularly opened on a horizontally long rectangular mounting surface (30).
By operating a switch (not shown), a suction force acts on each suction hole (33), and the mount film (11) can be sucked and held on the mounting surface (30).
Two positioning protrusions (31) and (31) are provided on the mounting surface (30) so as to approach the front end on the side where the operator stands. The protrusions (31) and (32) can be fitted into the holes (14) and (15) of the mount film (11) to position the mount film (11).
[0020]
A transparent plate (6) with a frame (61) is disposed above the work table (3) so as to be movable up and down. The transparent plate (6) is connected to an elevating drive device (not shown), and the surface of the table (3) is placed along the elevating guides (62) (62) by operating a switch (not shown). Ascend or descend in parallel with (30).
[0021]
On the transparent plate (6), the same number of cameras (4) (41) (42) as the number of the first alignment marks (81) of the mount film (11) are placed so that the lenses face directly below. The cameras (4), (41), and (42) are merely placed on the transparent plate (6), and can be moved to any position on the transparent plate (6) by hand.
[0022]
In the embodiment, the height from the floor on which the worker stands to the mounting surface (30) of the work table (3) is about 90 cm, and the transparent plate (6) is lowered to a position about 20 cm higher than the mounting surface (30). Then, it rises to a position 95 cm higher from the mounting surface (30).
Even if the transparent plate (6) is lowered, there is a 20 cm margin in the height direction with respect to the mounting surface (30) between the mounting surface (30) and the transparent plate (6). This is a safety measure for preventing a hand or a foreign object from being caught.
Further, if the transparent plate (6) is lifted by 95 cm from the mount (30), there is no possibility that the operator will be disturbed or collide with the transparent plate (6) during work.
The cameras (4), (41), and (42) on the transparent plate (6) are set so that the mount film (11) on the mounting base (30) is in focus at the raised position of the transparent plate (6). ing.
[0023]
In the back of the work table (3), monitors (5) (51) (52) for displaying images of signals from the cameras (4) (41) (42) are arranged.
Images are enlarged and displayed on the monitors (5), (51), and (52).
A computer (7) is connected to the cameras (4) (41) (42) and monitors (5) (51) (52).
The computer (7) includes image matching means, which is one of image processing means, and known template matching means in the embodiment, and displays pre-stored stored figures on the monitors (5) (51) (52). The memory figure is moved independently to the position of the new figure captured by the cameras (4), (41), and (42) and displayed on the monitors (5), (51), and (52). Can be superimposed.
In the present invention, the enlarged graphic of the first alignment mark (81) of the mount film (11) is stored in the computer (7) as the alignment mark (8).
[0024]
Next, the work procedure of sticking the plate (18) to the mount film (11) using the sticking device (2) will be described.
With the transparent plate (6) raised, the mount film (11) is placed on the work table (3), and the protrusions (31), (31) on the table (3) are positioned in the positioning holes (14) of the mount film (11). ) (15).
A suction force is applied to the suction hole (33) to hold the mount film (11) on the mounting surface (30) of the work table (3) without bending.
[0025]
The transparent plate (6) is lowered, and the camera (4) (41) (42) placed on the transparent plate (6) is manually attached by the operator to each first alignment mark (81) on the mount film (11). Since the transparent plate (6) to be moved to the vicinity of the position is close to the mount film (11), the cameras (4), (41), and (42) can be easily and quickly moved to the vicinity of each first alignment mark (81). Can be positioned. .
As shown by the two-dot chain line in FIG. 3, the camera lens center P is positioned from the center of the first alignment mark (81) with the camera (4) moved to the first alignment mark (81) side. The allowable range that may be shifted is a range in which the camera (4) can move up and capture the first alignment mark (81) and project it on the monitor (5). It is desirable that the entire first alignment mark (81) is reflected on the monitor (5), but an image with a part missing is also possible.
[0026]
Raise the transparent plate (6) together with the camera.
The camera lens is focused on the mount film (11), and the first alignment mark (81) (81) (81) of the mount film (11) captured by the camera (4) is displayed as the first image alignment mark (81a). As (81a) and (81a), the images are separately enlarged and projected on the three monitors (5), (51), and (52) (FIG. 4a).
On each monitor (5) (51) (52), a memory mark (8) stored in advance is displayed. Next, the stored matching mark (8) is moved on the monitors (5), (51), and (52) by the template matching means of the computer (7), and the first matching marks (81a) (81a) (81a) of the images are moved. The storage mark (8) is superimposed on the image, and the first image mark (81a) is not visible on the monitors (5), (51), and (52) (FIG. 4b).
[0027]
The plate (18) is put on the mounting position of the mount film (11) with the approximate register.
The second alignment marks (82), (82), and (82) of the plate (18) are captured by the cameras (4), (41), and (42), and the image second alignment marks (52) are displayed on the monitors (5), (51), and (52). 82a) (FIG. 4c).
While observing each memory alignment mark (8) (8) (8) on the monitor (5) and the second image alignment mark (82a) (82a) (82a), the plate (18) is moved to obtain the second image alignment image. The marks (82a) (82a) (82a) are aligned with the positions of the memory alignment marks (8) (8) (8) (FIG. 4d).
On the monitors (5), (51) and (52), the image first alignment mark (81a) of the mount film (11) overlaps with the memory alignment mark (8), and the image first alignment mark (81a) is overlapped. ) And the memory registration mark (8) are at the same position.
Therefore, if the three stored mark marks (8), (8), and (8) and the three second image mark marks (82a), (82a), and (82a) of the plate (18) coincide, The three second alignment marks (82), (82), and (82) correspond to the three first alignment marks (81), (81), and (81) on the mount film (11).
The alignment can be performed while looking at the enlarged marks (8) (81a) (82a), so that the plate (18) can be positioned on the mount film (11) without any error.
[0028]
Once the position of the plate (18) is determined, hold the plate (18) by hand so that the position of the plate (18) does not shift, peel off the release paper on the back of the plate (18), and mount with the adhesive layer Adhere to film (11).
[0029]
For each plate (18) having a different ink color, the plate is attached to a different mount film (11).
In the embodiment, even when the work of pasting one plate is finished, the memory alignment marks (8), (8), and (8) on the monitors (5), (51), and (52) remain at the work end position. It has been programmed.
Therefore, if the plate is attached to a different mount film (11) for each plate (18) having a different ink color, the mount film (11) is positioned and placed on the work table (3). For the second and subsequent mount films (11), the transparent plate (6) is lowered, the positions of the cameras (4) (41) (42) are moved, and the memory registration mark (8) and the plate (18) by template matching are used. The image matching step of the image second alignment mark (82a) is not required.
In the case of single color printing, only one printing plate (1) is required. Therefore, when the mount film (11) is placed on the work table (3), alignment on the work table (3) is unnecessary.
[0030]
In the practice of the present invention, the number of the first alignment mark (81) of the mount film (11) and the number of the second alignment mark (82) of the plate (18) are not limited to three, but two or more. The positioning accuracy improves as the number increases, but three or four are desirable from the viewpoint of workability. The number of cameras may correspond to the number of second alignment marks (82) on the plate (18).
[0031]
However, the number of monitors (5), (51), and (52) does not correspond to the number of cameras (4), (41), and (42), and the screen of one monitor is divided into a plurality of screens. The alignment marks (8) (82) and (8) (82) can be seen on a single monitor.
[0032]
The above description of the embodiments is for explaining the present invention, and should not be construed as limiting the invention described in the claims or reducing the scope thereof. In addition, the configuration of each part of the present invention is not limited to the above embodiment, and various modifications can be made within the technical scope described in the claims.
[Brief description of the drawings]
FIG. 1 is a perspective view of a plate pasting apparatus.
FIG. 2A is an explanatory diagram of a state in which a transparent plate and a camera are raised, and FIG. 2B is an explanatory diagram of a state in which a transparent plate and a camera are lowered.
FIG. 3 is an explanatory diagram for moving the camera to the vicinity of the first alignment mark on the mount film;
4A and 4B show the state of the monitor, in which FIG. A shows a state where the memory alignment mark and the first image alignment mark are shown on the monitor, and FIG. B shows a state where the storage alignment mark overlaps the first image alignment mark. FIGS. 4 and 6 show a state in which the second image mark of the plate is further reflected in the state of FIG. B, and FIG. 4 shows a state where the second image mark overlaps the lower side of the storage mark.
FIG. 5 is a perspective view of a printing plate.
FIG. 6 is a perspective view of a mount film.
FIG. 7 is a perspective view of a pasting apparatus previously proposed by the applicant.
[Explanation of symbols]
(1) Plate (11) Mount film (2) Pasting device (3) Work table (4) Camera (5) Monitor (6) Transparent plate (7) Computer (8) Memory alignment mark (81) First alignment mark (82) Second go mark

Claims (2)

To the first alignment mark (81) on the mount film (11),
In the method of aligning a plurality of second alignment marks (82) applied to the plate (18) and attaching the plate (18) to the mount film (11),
Mounting the mount film (11) on the work table (3);
The transparent plate (6) arranged so as to be movable up and down above the work table (3) is lowered until it approaches the mount film (11), and a plurality of cameras (4) (41) (42) are placed on the transparent plate (6). ) Is placed near each first alignment mark (81) on the mount film (11) manually by the operator ,
The process of raising the transparent plate (6) together with the camera to a height where the focus of the camera lens matches the mount film (11);
The first alignment mark (81) of the mount film (11) captured by the camera (4) is stored in the computer (7) in advance on the monitor (5) displayed as the image first alignment mark (81a). The stored registration mark (8) is moved by the image matching means of the computer (7) and superimposed on the image first registration mark (81a), and the other first registration mark (81) (81) of the plate (18). Similarly, the step of aligning the memory alignment mark (8) (8) with the first image alignment mark (81a) (81a) on the monitor (51) (52),
The plate (18) is placed on the mount film (11), the second alignment mark (82) of the plate (18) is captured by the cameras (4) (41) (42), and the image second alignment mark (82a) (82a ) (82a) is displayed on the monitor (5), and the mount film (11) while viewing each memory alignment mark (8) (8) (8) and the second image alignment mark (82a) (82a) (82a) Correcting the position of the plate (18) and aligning each image second alignment mark (82a) (82a) (82a) with the corresponding storage alignment mark (8) (8) (8);
A process of attaching the aligned plate (18) to the mount film (11),
How to paste a plate containing A work table (3) for attaching the plate (18) to the mount film (11);
Multiple cameras (4) (41) (42) with the lens facing down,
Monitors (5) (51) (52) for displaying images of signals from the cameras (4) (41) (42);
A mark corresponding to the first alignment mark (81) of the mount film (11) is stored in advance, and the stored alignment mark (8) is moved on the monitor (5) (51) (52). A plate pasting apparatus comprising a computer (7) having an image matching means for aligning with the first image alignment mark (81a) captured by the cameras (4) (41) (42) ,
A transparent plate (6) arranged to be movable up and down above the work table (3);
A plurality of cameras (4), (41) and (42) are placed on the transparent plate (6) so that they can be freely moved manually by an operator apparatus.

Images