JP2000006367A - Printing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the positional accuracy for printing in a printing device of such a system that a sheetlike plate is set across the inside of a sheet frame to perform printing. SOLUTION: A printing plate 1 is set across the inside of a sheet frame 2, which is, in turn, fitted into the inside of a support frame 4. A work 10 is set on an XYθ table 51. Near the end part of the surface of the work 10, reference marks 21 for position regis ration are previously formed, and marks 22 for position registration are previously formed on the back face of the printing plate 1. In addition, plural units of camera 23, 24 are arranged above the printing plate 1 against each of the marks 21, 22. Further, on the side face of the sheet frame 2, an adjusting screw 31 for a horizontal direction is set and an adjusting screw 32 for a height direction is set on the lower face of the sheet frame 2. The relative position of the sheet frame 2 to the support frame 4 is finely adjusted by adjusting the projection amount of each of the adjusting screws 31, 32.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printing apparatus,
In particular, the present invention relates to a configuration for improving the positional accuracy of printing in a printing apparatus that uses a sheet-shaped plate and performs printing by stretching the inside of a sheet frame.

[0002]

2. Description of the Related Art FIG. 6 shows an example of a schematic configuration of a conventional screen printing machine. The sheet-like plate 1 is stretched inside the seat frame 2 via the support sheet 3. The seat frame 2 is mounted inside the support frame 4 and is supported on an inner edge of the support frame 4. Pneumatic cylinders 7 and 8 are arranged above the seat frame 2, and the seat frame 2 is fixed to the support frame 4 by these pneumatic cylinders 7 and 8. A table 13 is arranged below the plate 1 so as to face the plate 1.
Set on top of.

[0003] By pressing the plate 1 from the back side using a squeegee 11, the surface (lower side) of the plate 1 is moved to the work 1 side.
0, and then the squeegee 11
When the ink is moved in a direction parallel to the surface of the plate 1, the ink attached to the surface of the plate 1 is transferred onto the work 10 and printing is performed.

[0004] A stopper 14 is provided near an end of the upper surface of the table 13. The work 10 is positioned by pressing the end of the work 10 against the stopper 14. However, the accuracy of the shape of the end of the work 10 is usually not so high, and there is a limit to the uniformity of the pressing conditions of the work 10 against the stopper 14. Therefore, it is not easy to position the work 10 with respect to the plate 1 with high accuracy.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems relating to the accuracy of positioning of a printing position in a conventional printing apparatus, and an object of the present invention is to use a sheet-like plate. Another object of the present invention is to provide a configuration for realizing high printing position accuracy in a printing apparatus of a type in which the printing is performed by stretching the inside of a sheet frame.

[0006]

According to the present invention, there is provided a printing apparatus comprising: a sheet frame on which a sheet-like plate is stretched inward; a support frame mounted outside the sheet frame and supporting the sheet frame from a lower surface and side surfaces. A moving table on which a printing material is placed and whose position can be adjusted in a plane parallel to the surface of the printing material; and a moving table arranged above the plate and provided on the surface of the printing material. First position measurement means for detecting the positions of a plurality of reference marks, and second position measurement for detecting the positions of a plurality of alignment marks provided above the plate and provided on the back side of the plate Means,
A printing apparatus that performs printing by pressing the plate against the surface of the printing medium, wherein a plurality of first adjustments are provided on a side surface of the sheet frame, and a tip of the first adjustment protrudes outward from a side surface of the sheet frame. A screw, a first lock mechanism provided for each of these first adjustment screws, for restricting rotation of each first adjustment screw, and a first lock mechanism provided on the lower surface of the seat frame. A plurality of second adjustment screws projecting downward,
A second lock mechanism provided for each of these second adjustment screws, for restricting rotation of each of the second adjustment screws, and the seat frame of each of the first adjustment screws and each of the second adjustment screws. The relative position of the sheet frame with respect to the support frame is adjusted by adjusting the amount of protrusion from the support frame, thereby finely adjusting the relative position of the plate with respect to the second measuring means.

According to the printing apparatus of the present invention, a plurality of reference marks provided in advance on the surface of the printing medium are detected by the first position measuring means, and provided in advance on the back surface of the printing plate. By detecting a plurality of alignment marks by the second position measuring means and adjusting the relative position of the moving table with respect to the plate based on the data, the printing object can be accurately positioned with respect to the plate. Can be matched.

Further, the relative position of the seat frame with respect to the support frame is adjusted by using each of the first adjusting screws and each of the second adjusting screws, whereby the plate is positioned relative to the second position measuring means. Since the position of the alignment mark on the back surface can be accurately adjusted, the position measurement of the alignment mark by the second position measuring means can be performed with high accuracy, and the alignment accuracy of the printing medium with respect to the plate can be improved. It can be maintained with high accuracy. Thus, printing with high positional accuracy can be realized.

[0009]

FIG. 1 shows an example of an offset printing press according to the present invention. In the drawing, 1 is a sheet-like plate, 2 is a sheet frame, 4 is a support frame, 10 is a work (substrate to be printed), 51 is an XYθ table (moving table), 21 is a reference mark, 22 is an alignment mark, and 23 is Camera (first position measuring means), 24 is a camera (second position measuring means), 31 is a horizontal adjusting screw (first adjusting screw), 32 is a height adjusting screw (second adjusting screw) , 3
Reference numeral 3 denotes a lock nut (first lock mechanism), and reference numeral 34 denotes a lock nut (second lock mechanism).

The sheet-shaped plate 1 is stretched inside the seat frame 2 via the support sheet 3. The seat frame 2 is mounted inside the support frame 4 and is supported on an inner edge of the support frame 4. Above the seat frame 2, pneumatic cylinders 7, 8 are arranged.
Is fixed to the support frame 4 by the pneumatic cylinders 7 and 8. A table 13 is arranged below the plate 1 so as to face the plate 1, and the work 10 is set on the table 13.

In this example, a roller 12 is used instead of the squeegee 11 shown in FIG. The surface of the plate 1 is pressed against the work 10 by pressing the plate 1 from the back side using the roller 12, and then the roller 12 is rolled in a direction parallel to the surface of the work 10. The ink that has adhered to the surface (lower surface side) is transferred onto the work 10 and printing is performed.

The table 13 is fixed on the XYθ table 51. Table 51 is driven by actuators 52, 53, and 54 provided on the lower surface side of the table 13 in a plane parallel to the surface of the work 10.
Can be moved and rotated in two axial directions.

A plurality of reference marks 21 are formed in advance near the end of the surface of the work 10 for positioning at the time of printing. On the other hand, a plurality of alignment marks 22 are similarly formed in advance on the back surface (upper surface side) of the plate 1. Further, openings 25 are formed in advance on the periphery of the plate 1 at positions corresponding to the respective reference marks 21 on the surface of the work 10. These marks 21, 2
2, a camera 23 and a camera 2 are provided above the plate 1.
4 are arranged in plurality. Camera 23
Are respectively connected to the work 10 through the openings 25 described above.
The camera 24 observes each of the alignment marks 22 on the back surface of the plate 1, respectively. When printing on the work 10, the plate 1 is transferred to the work 1.
Before lowering the roll 12 so as to make it come into contact with zero, the position of the reference mark 21 on the front surface of the work 10 is measured by the camera 23, and the position of the alignment mark 22 on the back surface of the plate 1 is measured by the camera 24. Based on this measurement result, the XYθ table 51 is driven so that the reference mark on the front surface of the work 10 with respect to the alignment mark 22 on the back surface of the plate 1 comes to a predetermined position, and the work 1
Adjust the 0 position.

For example, the magnification of the measuring system including the cameras 23 and 24 is 90 times, and the center positions of the reference mark 21 and the alignment mark 22 are
In the range of ± 0.2 mm from the central axis of the above, the above positioning operation can be completed in a required time of about 1 second. In addition, the amount of deviation of the center position is ± 0.
If it exceeds 2 mm, it is necessary to repeat the positioning operation or reset the work 10.

Further, depending on the depth of focus of the cameras 23 and 24, the position of the reference mark 21 or the alignment mark 22 is determined by the position of the focal point of the cameras 23 and 24 in a generally used commercially available measuring system. ± 0.5mm from
If it is within the range, accurate positioning can be performed. However, when the above value exceeds ± 0.5 mm, the reference mark 21 or the alignment mark 2
Since the image 2 is deformed or its outline becomes unclear, a positioning error occurs.

Therefore, in the printing apparatus of the present invention,
A plurality of horizontal adjusting screws 31 are provided on each side surface of the seat frame 2, and the tips of the adjusting screws 31 project outward from the side surfaces of the seat frame 2 to form the support frame 4.
It comes to hit inside. Similarly, a plurality of height-adjusting screws 32 are provided on each lower surface of the seat frame 2, and the tips of these adjusting screws 32 project downward from the lower surface of the seat frame 2, and are provided inside the support frame 4. It comes to hit the edge.

FIGS. 2 and 4 show a horizontal adjusting screw 31.
And details of the mounting portion. A plurality of cases 35 are embedded in each of the frames 2a, 2b, 2c, and 2d constituting the four sides of the seat frame 2, and the adjustment screws 31 are attached to the cases 35, respectively. At the tip of each adjusting screw 31, a metal bronze 41 made of a soft and wear-resistant nickel-based bronze alloy is embedded so as to prevent the inner surface of the support frame 4 from being worn. By manipulating the amount of rotation of each adjustment screw 31, each adjustment screw 31
Of the front end of the seat frame 2 (the frame 2a) can be adjusted. Further, a lock nut 33 (first lock mechanism) having a hexagonal hole 33a for restraining the movement of each adjustment screw 31 is screwed into the outer periphery of each adjustment screw 31 to prevent loosening after the adjustment. ing.

FIGS. 3 and 4 show an adjusting screw 32 in the height direction.
And details of the mounting portion. Similarly to the above, a plurality of cases 36 are embedded in the frame bodies 2a and 2c constituting the sides of the seat frame 2, and the adjustment screws 32 are attached to these cases 36, respectively. A claw metal 42 is embedded at the tip of each adjustment screw 32.
By manipulating the amount of rotation of each adjustment screw 32, the amount of protrusion of the tip of each adjustment screw 32 from the lower surface of the seat frame 2 (frame 2a) can be adjusted. Further, a lock nut 34 (second lock mechanism) having a hexagonal hole 34a for restricting the movement of each adjustment screw 32 is screwed into the outer periphery of each adjustment screw 32.

As shown in FIG. 4, the adjusting screws 31a and 31a
By manipulating the protrusion amount such as b, the camera 24a
(24b) center and alignment mark 22a (22
The distance Y (Z) between the center line 61a (61b) passing through the center of b) and the line 63 connecting the tips of the adjusting screws 31a and 31b.
Can be adjusted with high accuracy.

Similarly, by manipulating the amount of protrusion of the adjusting screws 31g, 31h, etc., a center line 61a (61b) passing through the center of the camera 24a (24b) and the center of the alignment mark 22a (22b) is adjusted. 31g and 31
The distance W (X) from the line 64 connecting the tips of h can be adjusted with high accuracy.

As shown in FIG. 5, each adjusting screw 32a
To adjust the distance U (V) between the alignment mark 22a (22b) on the back surface of the plate 1 and the line 67 connecting the tips of the adjusting screws 32c and 32f with high precision by manipulating the protrusion amounts of h. Can be.

For example, in the case of multi-color intaglio direct printing (drinking printing), a large number of sheet frames 2 are prepared, and after the ink is filled in the grooves of the plate surface, the sheet frames 2 are sequentially replaced while performing a curing process. , Multi-color printing can be performed with high accuracy.

In the printing apparatus of the present invention, the seat frame 2 can be easily mounted on the support frame 4, and the positioning of the seat frame 2 can be performed in a short time with high accuracy. Therefore, intaglio direct printing with high accuracy and stable quality can be realized with high efficiency.

As the printing plate 1, in addition to the intaglio printing plate used in the above description, a relief printing plate, planographic printing plate, waterless planographic printing plate, sheet-like ink transfer body (blanket) and the like can be used. Also, in the above example, an example is shown in which an optical detector is used as the first and second position measuring means.
Various position measuring means such as a magnetic detection method using a magnetic mark can be applied. Furthermore, in the above example, the first and second lock mechanisms are hexagonal holes 3
Although the example in which the lock nuts 33 and 34 with 3a and 34a are used has been described, the present invention is not limited to this, and various types such as a set screw method that presses the first and second adjustment screws 31 and 32 from the side may be used. Can be changed.

[0025]

According to the printing apparatus of the present invention, a sheet frame on which a sheet-like plate is stretched can be easily and accurately mounted on a support frame provided on the printing press body. Therefore, high-quality printing with excellent positional accuracy can be performed.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a schematic configuration of a printing apparatus according to the present invention.

FIG. 2 is a partial sectional view showing a schematic configuration of a mounting portion of a horizontal adjusting screw used in the printing apparatus of the present invention (C-C in FIG. 4);
C line sectional view).

FIG. 3 is a partial sectional view showing a schematic configuration of a mounting portion of a height adjusting screw used in the printing apparatus of the present invention (B-B in FIG. 4);
B sectional view).

FIG. 4 is a perspective view showing a configuration of a seat frame used in the printing apparatus of the present invention.

5 is a sectional view of the seat frame shown in FIG. 4 taken along line AA.

FIG. 6 is a longitudinal sectional view showing a schematic configuration of a conventional printing apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... plate, 2 ... seat frame, 2a, 2b, 2c, 2d ... frame, 3 ... support sheet, 4 ... support frame, 7 ... pneumatic cylinder, 8 ... ..Pneumatic cylinder, 10 ... Work (substrate to be printed), 11 ... Squeegee, 12 ... Roll, 13 ... Table, 14 ... Stopper, 21 ... Reference mark, 22 ... · Positioning mark, 23 ··· camera (first position measuring means), 24 ··· camera (second position measuring means), 25 ··· opening, 31 ··· horizontal adjustment screw ( 32: height adjustment screw (second adjustment screw), 33: lock nut (first lock mechanism), 34: lock nut (second lock mechanism), 35 , 36 ... case, 41, 42 ... claw metal, 51 ... XYθ table (Moving table), 52, 53, 54 ... actuators.

Claims (1)

[Claims] 1. A sheet frame on which a sheet-shaped plate is stretched inward, a support frame mounted on the outside of the sheet frame and supporting the sheet frame from a lower surface and a side surface, and a printing material is placed on the support frame. A moving table capable of adjusting the position in a plane parallel to the surface of the printed matter; and a first table disposed above the plate and detecting positions of a plurality of fiducial marks provided on the surface of the printed matter. And second position measuring means arranged above the plate and detecting the positions of a plurality of alignment marks provided on the back side of the plate. In a printing device that performs printing by pressing against the surface of the printed matter, a plurality of first adjustment screws provided on the side surface of the seat frame, the tip of which protrudes outward from the side surface of the seat frame, A first lock mechanism provided for each of these first adjustment screws, for restricting the rotation of each first adjustment screw, provided on the lower surface of the seat frame, and having a tip extending downward from the lower surface of the seat frame. A plurality of second adjusting screws protruding, and a second lock mechanism provided for each of the second adjusting screws and restraining rotation of each of the second adjusting screws. By adjusting the amount of protrusion of each of the second adjustment screws from the seat frame, the relative position of the seat frame with respect to the support frame is adjusted, thereby finely adjusting the relative position of the plate with respect to the second measuring means. A printing apparatus for performing the following.