JPH0344095A - Screen printer corresponding to through-hole printing - Google Patents

Abstract

PURPOSE:To improve a through-hole printing forming rate uniformly extending over the whole through-holes of a print by gradually forming the pin-holes of a current regulating plate, to which a plurality of the pin-holes are shaped in a matrix form, toward the printing finishing side from the printing starting side of the print in small size and inclining the current regulating plate in high height on the printing standing starting side of the print. CONSTITUTION:A suction block 19 for holding a print 1, a suction port 10 formed to the bottom of the suction block 19, a suction device 11 piped to the suction port 10, and a current regulating plate 20, to which a plurality of pin-holes 21 are shaped in a matrix form between the suction port 10 and the print 1 positioned and fixed onto the suction block 19, are provide. The flow rate of suction is increased regarding the low section of suction pressure on the printing starting side by making the pin-holes 21a on the printing starting side of the current regulating plate 20 larger than the pin-holes 21b on the printing finishing side and bringing the printing starting side of the current regulating plate 20 near to the print 1. Accordingly, a through-hole printing forming rate on the printing starting side can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention mainly relates to a screen printing machine compatible with through-hole printing that prints thick film circuit forming paste and the like with high precision.

BACKGROUND OF THE INVENTION In recent years, various improvements have been made to screen printers capable of through-hole printing to print with high precision as circuit boards on which electronic components are mounted become finer.

For example, with the miniaturization of circuits in conductor printing, the hole diameter of the through-pole conductor that connects double-sided circuits is also becoming smaller. Reliability of hole suction printing accuracy is also important.

Hereinafter, the above-mentioned conventional screen printing machine compatible with through-hole printing will be described with reference to the drawings.

FIG. 8 is a schematic cross-sectional view of the main parts of a conventional screen printing machine compatible with through-hole printing. In FIG. 8, 1 is a printing material, 2 is a through hole formed in the printing material 1, 3 is a screen plate, 4 is a printing squeegee, 5 is a printing paste, arrow A is the printing direction of the printing squeegee 4, 6 is a scraper for returning the printing paste 5 to its original position after printing;
7 is a suction block for holding the printing material 1, and 8 is a rectifying plate. FIG. 9 is a plan view of the current plate 8, in which a plurality of small holes 9 having the same diameter are arranged in a matrix. In FIG. 8, 10 is a suction port provided on the bottom of the suction block, and 11 is a suction device. The suction device 11 is
It is composed of a pressure gauge 12, a throttle valve 13, a suction ON/OFF switching valve 14, and a suction blower 15, and the suction pressure is adjusted by adjusting the throttle valve 13 while reading the value of the pressure gauge 12. 16a
and 16b is a muffler. 17a, 17b.

17c indicates the suction direction.

The operation of the conventional screen printer capable of through-hole printing shown in FIGS. 8 and 9 and configured as described above will now be described.

The printing material 1 is placed on the suction block 7 by a positioning device (
(not shown), and in this state, the suction ON/OFF switching valve 14 is turned on (in the OFF position B in the figure) to start suction. Thereafter, while scraping the top surface of the screen plate 3 in the direction of the arrow X with the printing squeegee 4 so as to press the screen plate 3 against the printing material 1, the printing paste 5 is applied to the opening of the screen plate 3 (not shown).
The paste is transferred (printed) to the printing material 1. After printing is completed, the suction ON/OFF switching valve 14 is turned OFF, and the printing paste is returned to its original position using the scraper 6. As a result, the printing paste 5 printed on the through hole 2 is moved by the suction pressure of the suction blower 15, as shown in FIG.
Through-hole printing such as 18a and 18b is performed on the side surface of the through-hole 2. Reference numeral 18a indicates the through-hole printing state of part A on the printing start side, and reference numeral 18b shows the through-hole printing state of part B on the printing end side.

Problems to be Solved by the Invention However, in the above-mentioned configuration, as shown in FIG.
Through-hole printing formation rate (indicates the through-hole printing formation rate with respect to the thickness of the printing substrate 1. Therefore, a through-hole printing formation rate of 100% means that the entire side surface of the through-hole 2 of the printing substrate 1 is printed. > is not uniform. On the printing start side, as shown in 18a, the through-hole printing formation rate is poor, and on the printing end side, as shown in 18b, the printing paste is excessively suctioned to the back side of the printing material l. In addition, when the suction pressure is increased to make the through-hole printing formation rate on the printing start side 100%, the through-hole printing state on the printing end side becomes printing paste as shown in 18c in Fig. 11. is suctioned more excessively than in the state 18b in Fig. 10, and the printing is not uniform.
Causes holes to become clogged. In the worst case, by increasing the suction pressure, separation of the screen plate 3 from the printing material 1 becomes extremely difficult, and bleeding of printed circuits on the surface of the printing material 1 occurs, resulting in printing defects. Conversely, if the suction pressure is lowered in order to make the through-hole printing formation rate on the printing end side 100%, the through-hole printing state on the printing start side will change as shown in 18d in Fig. 12. Paste 5 does not cut through the hole, causing hole clogging. The following are possible causes of these problems. Indeed, rectifier plate 8
By providing this, it is possible to obtain a fairly uniform suction pressure over the entire through hole 2 of the printing material 1 when the printing material 1 is simply positioned and fixed on the suction block 7 before printing. However, after printing starts, the printing paste 5 is printed on the side of the through-hole 2 in order from the printing start side. Since the pressure is higher than that on the printing start side, there is a problem in that the through-hole printing formation rate is different between the printing start side and the printing end side.

Means for Solving the Problems In order to solve the above-mentioned problems, the screen printing machine for through-hole printing of the present invention has a square-shaped printing material holding suction block that holds the end surface of the printing material, and a printing material holding suction block. 7. Suction port provided at the bottom and piping connected to the suction port. A rectifying plate with a plurality of small holes arranged in a matrix is provided between the suction device and the printed material positioned and fixed on the suction port and the printed material holding suction block.
It has a configuration in which the size gradually decreases from the print start side of the print material to the print end side, and the rectifying plate is tilted higher toward the print start side of the print material.

Function The present invention has the above-mentioned configuration, so that the small holes in the current plate are made larger than the small holes on the print end side to compensate for the lower suction pressure on the print start side, and the print start side of the current plate is tilted higher. By bringing it closer to the printing material, it is possible to increase the suction flow rate, and as a result, it is possible to increase the through-hole printing formation rate on the printing start side, and
The higher suction pressure on the printing end side can be compensated for by lowering the suction flow rate by making the small holes in the rectifier plate smaller than on the printing start side and moving the rectifier plate farther away from the printing material than on the printing start side. As a result, it is possible to reduce the amount of excessive suction of printing paste on the printing end side, so it is possible to uniformly improve the through-hole printing formation rate over the entire through-hole of the printing medium.

EXAMPLE A screen printer compatible with through-hole printing according to a first example of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic cross-sectional view of the main parts of a screen printing machine compatible with through-hole printing in a first embodiment of the present invention. or,
Components having the same functions as the conventional screen printing machine for through-hole printing (Fig. 8) are designated by the same reference numerals as in the schematic cross-sectional view of the main parts of the conventional screen printing machine for through-hole printing shown in Fig. 8. , the explanation of the same components will be omitted and the operation will be explained in a simplified manner.

In FIG. 1, one is a suction block for holding the printing material 1, and 20 is a current plate. FIG. 2 is a plan view of the current plate 20, in which a plurality of small holes 21 are arranged in a matrix. Based on the diameter of the small holes 21 arranged in the center of the current plate 20, the small holes 21a on the printing start side
The diameter of the small hole 21b is large, and the diameter of the small hole 21b on the printing end side is small, and the diameter of the small hole 21b is formed to become smaller gradually from the printing start side to the printing end side. In addition, in FIG.
is attached to the suction block 19 with the printing start side tilted high with the central portion as a fulcrum.

22a, 22b, and 22c indicate the suction direction. Components with other symbols that are not explained in FIG. 1 have the same symbols and the same functions as those in FIG. 8, which is a schematic cross-sectional view of main parts of a conventional screen printing machine compatible with through-hole printing.

The operation of the screen printer capable of through-hole printing in the first embodiment of the present invention shown in FIGS. 1 and 2 and constructed as described above will be described.

The printing paste 5 is transferred from the opening of the screen plate 3 while pushing the screen plate 3 against the printing material 1 with the printing squeegee 4 in the direction of the arrow X, and the printing paste 5 transferred onto the through hole 2. While suctioning with the suction device 11, a printing pattern is printed on two sides of the printing material 1 positioned and fixed on the suction block 19,
At the same time, suction printing is performed on the side surface of the through hole 2.

As described above, according to the first embodiment of the present invention, the printing substrate 1
Suction block 19 for holding the suction block 19
A plurality of small holes 21 are provided between the suction port 10 provided at the bottom of the screen, the suction device 11 piped to the suction port 10, and the printing material 1 positioned and fixed on the suction port 10 and the suction block 19.
The current plate 20 includes a rectifier plate 20 provided in a matrix shape.
Based on the diameter of the small holes 21 arranged in the center of 0,
The small holes 21 of the current plate 20 are formed so that the small holes 21a on the printing start side have a large diameter, and the small holes 21b on the printing end side are small, so that the small holes 21a on the printing start side become gradually smaller from the printing start side to the printing end side, and By tilting the rectifying plate 20 higher towards the printing start side of the printing material 1, as shown in FIG.
By making the hole 21b larger than the small hole 21b on the printing end side and bringing the printing start side of the rectifying plate 20 closer to the printing medium 1, the suction flow rate can be increased, and as a result, the through-hole printing formation rate on the printing start side can be increased. In addition, the small hole 21b on the printing end side of the rectifying plate 20 is smaller than the small hole 21a on the printing start side to compensate for the high suction pressure of the printing finished steel, and
By moving the printing end side of the rectifying plate 20 away from the printing material 1, the suction flow rate can be lowered, and as a result, it is possible to reduce the amount of excessive printing paste suction on the printing end side. As shown in the through-hole printing state 18e shown, it is possible to uniformly improve the through-hole formation rate for any of the through-holes 2 on the printing substrate 1.

Regarding the through-hole printing compatible screen printing machine according to the second embodiment of the present invention, the components have the same functions as the first embodiment of the present invention and the conventional through-hole printing compatible screen printing machine shown in FIG. are given the same reference numerals as those of the first embodiment of the present invention and the conventional screen printing machine compatible with through-hole printing, explanations of the same components are omitted, and operation explanations are simplified. This will be explained with reference to FIG. FIG. 5 is a schematic cross-sectional view of the main parts of a screen printer compatible with through-hole printing in a second embodiment of the present invention. In FIG. 5, 23 is a suction block for holding the printing material 1, and 24 is a slide rectifying plate. FIG. 6 is a plan view of the slide rectifier plate 24.

As shown in FIG. 6, the slide rectifying plate 24 has a plurality of small holes 25 arranged in a row in the direction in which the printing squeegee 4 contacts the screen plate 3. As shown in FIG. In FIG. 5, the slide baffle plate 24 is slidably moved in the direction of arrow A. 26a to 26c indicate the suction direction. Components with other symbols have the same symbols and functions as those in the first embodiment and the conventional screen printing machine compatible with through-hole printing.

The operation of the screen printer capable of through-hole printing in the second embodiment of the present invention shown in FIGS. 5 and 6 and constructed as described above will be described.

While pushing the screen plate 3 against the printing material 1 with the printing squeegee 4 in the six directions of the arrows, transfer the printing paste 5 from the opening (not shown) of the screen plate 3, and at the same time transfer the printing paste 5 to the slide rectifying plate 24. Slide the printing squeegee 4 at the same speed in the moving direction so that the small hole 25 is directly below the printing squeegee 4, and suck the printing paste 5 transferred onto the through hole 2 with the suction device ll. At the same time, a printing pattern is printed on the upper surface of the printing material 1 positioned and fixed on the suction block 23, and suction printing is performed on the side surface of the through hole 2.

As described above, according to the second embodiment of the present invention, the printing material ■
Suction block 23 for holding the suction block 23
A plurality of small holes 9 are formed in a matrix between the suction port 10 provided at the bottom of the screen, the suction device piped to the suction port 10, and the printing material 1 positioned and fixed on the suction port 10 and the suction block 23. A slide baffle plate 24 is provided with a plurality of small holes 25 of the same diameter in a line in the direction in which the printing squeegee 4 contacts the screen plate 3, and the small holes of the slide baffle plate 24 are always printed. In the direction of movement of the printing squeegee 4 (arrow X direction) so that it is directly below the squeegee 4,
By configuring the slide rectifying plate 24 to be able to slide at the same speed as the printing squeegee 4, only the through hole 2 of the printing material 1 located directly above the small hole 25 provided in the slide rectifying plate 24 can be moved. Since the suction pressure is constant without being affected by the through-holes that have already been printed, the through-hole printing formation rate can be adjusted to the through-hole printing rate of substrate 1, as shown in the through-hole printing state of 18e shown in Fig. 4. Any through hole 2 can be uniformly improved.

Regarding the through-hole printing compatible screen printing machine according to the third embodiment of the present invention, components having the same functions as the first and second embodiments of the present invention and the conventional through-hole printing compatible screen printing machine will be explained below. The first aspect of the present invention is as follows. The same reference numerals as those of the second embodiment and the conventional screen printing machine compatible with through-hole printing will be used, explanations of the same components will be omitted, and the operation will be simplified and explained with reference to FIG. 7. . FIG. 7 is a schematic cross-sectional view of the main parts of a screen printer compatible with through-hole printing in a third embodiment of the present invention. In FIG. 7, 27 is a suction device, 1
3a is a throttle valve, 28 is a throttle valve 1 to adjust the suction pressure.
A control motor that opens and closes 3a, 29 a suction pressure measuring device for measuring suction pressure, and 30 processing a signal output from the suction pressure measuring device 29, so that the suction pressure value of the suction pressure measuring device 29 is determined by the suction pressure setting. This is a control unit that outputs an appropriate rotation speed to the control motor 28 so that it is always constant with respect to the pressure value.

31a, 31b, and 31c indicate the suction direction. Components with other symbols have the same symbols and functions as those in the first and twenty-seventh embodiments and the conventional screen printing machine compatible with through-hole printing.

The operation of the screen printer capable of through-hole printing in the third embodiment of the present invention shown in FIG. 7 and configured as described above will be described.

While pushing the screen plate 3 against the printing material 1 with the printing squeegee 4 in the direction of the arrow X, transfer the printing paste 5 from the opening (not shown) of the screen plate 3 and onto the through hole 2. While suctioning the transferred printing paste 5 with a suction device 27, a printing pattern is printed on the upper surface of the printing material 1 positioned and fixed on the suction block 7, and suction printing is performed on the side surface of the through hole 2. At this time, the suction pressure measuring device 29 measures the suction pressure during printing.
The control unit 3 constantly measures the suction pressure value so that it does not change.
0 to the control motor 28, and adjusts the opening/closing degree of the throttle valve 13a to keep the suction pressure constant at all times.

As described above, according to the third embodiment of the present invention, the printing substrate 1
The suction block 7 and the suction block 8 for holding the lock 7 The suction port 10 provided at the bottom of the lock 7, the suction device 27 piped to the suction port 10, the suction port 10 and the suction block 7
A rectifying plate 8 having a plurality of small holes 9 arranged in a 7-trix pattern is provided between the print substrate 1 positioned and fixed above, and a suction device 27 is installed, a suction blower 15 and a suction ON/OFF switching valve 14, A throttle valve 13a, a control motor 28 that opens and closes the throttle valve 13a, two suction pressure measuring devices that measure suction pressure, and a signal output from the suction pressure measuring device 29 are processed to determine the suction pressure value of the suction pressure measuring device 29. By configuring the control unit with a control unit that outputs an appropriate rotation speed to the control motor 28 so that the suction pressure becomes constant with respect to the set suction pressure value, the suction pressure value can be adjusted while constantly measuring the suction pressure during printing. The suction pressure can be constantly adjusted by outputting an appropriate rotational speed from the control unit 30 to the control motor 28 and adjusting the opening/closing degree of the throttle valve 13a so that the suction pressure does not change, as shown in FIG. 4], 8
As in the through-hole printing state of e, it is possible to uniformly improve the through-hole printing formation rate for any through-hole 2 on the printing material 1.

Effects of the Invention As described above, the present invention provides a square-shaped printing material holding suction block that holds an end surface of a printing material, a suction port provided at the bottom of the printing material holding suction block, and a suction device piped to the suction port. A rectifying plate with a plurality of small holes arranged in a matrix is provided between the suction port and the printing substrate positioned and fixed on the printing substrate holding suction block, and the small holes of the rectifying plate are connected to the printing start side of the printing substrate. Through-hole printing is formed in the middle of printing, starting from the print start side, by gradually forming smaller holes from the printing end side to the printing end side, and by tilting the rectifying plate higher toward the print start side of the printing target. As the suction pressure increases moment by moment, the small holes in the rectifier plate are made smaller than the small holes on the printing end side to account for the lower suction pressure on the print start side, and the print start side of the rectifier plate is This can be done by increasing the suction flow rate by tilting it higher and bringing it closer to the printing material, and as a result, it becomes possible to increase the through-hole printing formation rate on the printing start side. In addition, the higher suction pressure on the printing end side can be compensated for by lowering the suction flow rate by making the small holes in the rectifier plate smaller than on the printing start side, and by moving the rectifier plate farther away from the printing material than on the printing start side. As a result, it is possible to reduce the amount of excessive suction of printing paste on the printing end side, so it is possible to uniformly improve the through-hole printing formation rate over the entire through-hole of the printing medium.

[Brief explanation of drawings]

FIG. 1 is a schematic cross-sectional view of the main parts of a screen printing machine compatible with through-hole printing according to the first embodiment of the present invention, FIG. 2 is a plan view of the rectifying plate in FIG. 1, and FIG. A diagram showing the relationship between suction pressure and suction flow rate, Fig. 4 is a state diagram of through-hole printing showing the optimum through-hole printing formation rate, and Fig. 5 is a screen printing machine compatible with through-hole printing in the second embodiment of the present invention. A schematic sectional view of the main parts of
Figure 6 is a plan view of the slide rectifying plate in Figure 5;
The figure is a schematic cross-sectional view of the main parts of a screen printing machine compatible with through-hole printing according to the third embodiment of the present invention, and FIG. 8 is a schematic cross-sectional view of the main parts of a conventional screen printing machine compatible with through-hole printing. is a plan view of the rectifying plate in Fig. 8, and Fig. 10 is a plan view of the rectifying plate in Fig. 8.
Fig. 11 is an enlarged detailed view of the through-hole printing state when the suction pressure is high, and Fig. 12 is an enlarged detailed view of the through-hole printing state when the suction pressure is low. . 1... Printing material, 3... Screen plate, 4... Squeegee, 5... Printing paste, 10... Suction port, 11 .27...
Suction device, 19.23...Suction block, 20
．． 24... Rectifier plate, 21° 21a, 21b, 2
5=-・small hole.

Claims (4)

[Claims] (1) Apply printing paste on the screen plate to the through hole of the printing material with a through hole formed therein by scraping it with a squeegee, and at the same time print on the side of the through hole while suctioning. A printing compatible screen printing machine, comprising: a square-shaped printing material holding suction block that holds an end surface of the printing material; a suction port provided at the bottom of the printing material holding suction block;
A suction device having the suction port piped therein; and a rectifying plate having a plurality of small holes arranged in a matrix between the suction port and the printing material positioned and fixed on the printing material holding suction block; A screen printing machine compatible with through-hole printing, characterized in that the small holes in the rectifying plate are formed gradually smaller from the printing start side of the printing material to the printing end side. (2) A screen printing machine compatible with through-hole printing according to claim 1, characterized in that the rectifying plate is tilted high toward the printing start side of the printing medium. (3) Apply printing paste on the screen plate to the through-hole of the printing material with a through-hole formed therein using a squeegee, and at the same time print on the side of the through-hole while suctioning. A printing compatible screen printing machine, comprising: a square-shaped printing material holding suction block that holds an end surface of the printing material; a suction port provided at the bottom of the printing material holding suction block;
a suction device piped to the suction port; a rectifying plate having a plurality of first small holes arranged in a matrix between the suction port and the printing material positioned and fixed on the printing material holding suction block; A slide rectifier plate is provided with a plurality of second small holes of the same diameter in at least one row in the direction in which the squeegee contacts the screen plate, and the second small holes of the slide rectifier plate are always directly below the squeegee. A screen printing machine compatible with through-hole printing, characterized in that the slide baffle plate can be slid in the direction of movement of the squeegee at the same speed as the squeegee. (4) Apply printing paste on the screen plate to the through hole of the printing material with a through hole formed therein by scraping it with a squeegee, and at the same time print on the side of the through hole while suctioning. A printing compatible screen printing machine, comprising: a square-shaped printing material holding suction block that holds an end surface of the printing material; a suction port provided at the bottom of the printing material holding suction block;
A suction device piped to the suction port, and a rectifying plate having a plurality of small holes arranged in a matrix between the suction port and the printing material positioned and fixed on the printing material holding suction block, The device consists of a suction blower and a suction O
It is composed of an N/OFF switching valve, a suction pressure adjustment throttle valve, a control motor that opens and closes the suction pressure adjustment throttle valve, a suction pressure measuring device that measures the suction pressure, and a control section, and the control section is , processes the signal output from the suction pressure measuring device, and constantly outputs an appropriate rotation speed to the control motor so that the suction pressure value of the suction pressure measuring device is constant with respect to the set suction pressure value. A screen printing machine that supports through-hole printing.