JPH01253448A - Screen printer - Google Patents

Abstract

PURPOSE:To transfer a base plate to a correct position without need of high grade control technology, and to make a printer compact, by transferring the base plate to a printing position by means of a turntable which holds the base plate on it by sucking and intermittently turns in one direction. CONSTITUTION:A base plate 81 is provided with two holes 82 in it, and placed and held on the porous plate of a base plate holder 7 by sucking. A turntable 1 is turned by 90 deg. counterclockwise to transfer the base plate holder 7 from the supply position A to the position B, and then the coordinates of the holes 82 on the base plate 81 are detected by CCD cameras 2a and 2b. The turntable is controlled as specified according to the deviations of the coordinates, and a printing head frame 4 is horizontally moved to locate a screen at the printing position C. Then, the turntable 1 is turned by 90 deg. counterclockwise to transfer the base plate holder 7 to the printing position C, and the printing head frame 4 is moved downward to locate the screen at a height suitable for printing, so that an image is printed on the base plate 81 on the base plate holder 7 by a squeeging unit 5.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a screen printing machine suitable for printing substrates such as green sheets (unfired ceramic substrates).

[Prior Art] Conventionally, for example, as disclosed in Japanese Patent Publication No. 55-44474, a printer is mounted at a printing position that is positioned at a predetermined position with respect to a screen and is mounted below the screen.
A worker set the board to be printed on the table that was being used for screen printing.

[Problems to be Solved by the Invention] However, such a semi-automatic printing machine has a drawback in that it is difficult to increase the number of sheets printed per unit time.

For example, as disclosed in Japanese Unexamined Patent Publication No. 61-287294, a fully automatic printing machine in which the board is transferred to the printing position using a conveyor has been proposed. However, when using a conveyor type, a substrate transfer line must be constructed to cross the printing position, and therefore a large floor area is required. In addition,
Although it is necessary to accurately transfer the substrate at the printing position, using the compare method has the disadvantage that sophisticated control technology must be provided.

This defense focuses on the above, and as a result of intensive studies from various angles to solve this problem, as a means of transporting the substrate to the printing position, the substrate is held by suction, and the substrate is intermittently rotated in one direction. He discovered that it would be better to use a turntable with

[Means for solving the problem] That is, the screen mark Jal'l m according to the present invention
The present invention is characterized in that the substrates to be printed are held by suction, and the substrates can be successively transferred to a printing position via a turntable that is driven to rotate intermittently in one direction. .

[Example] Hereinafter, an example will be described based on the drawings. In FIG. 1, 1 is a turntable, 2a and 2b are CCD cameras, 3 is an image processing device, 4 is a print head frame body, and 5 is a squeegee unit. are shown respectively, and turntable 1 is the second
As shown in the figure, a substrate holder 7 attached to the upper surface of the disk 6, a disk receiver fixed to the lower surface of the disk 6 and fitted to the table shaft 8, An intake passage connecting tool 10 is located below the board holder 7 and is fixed to the lower surface of the disk 6, and a disk is connected to the disk so as to close a through hole 11 formed concentrically with the center of the disk 6. 6 and the intake passage 1 bored in the disc receiver.
3 and the intake passage 1 bored in the intake passage connecting tool 10
4 and a conduit 15 that is piped between the two via a suitable pipe joint such as a nipple.

The disk receiving collar is attached to the table shaft 8 via a locking jig 16 fixed to the table shaft 8 so as to be able to rotate together with the table shaft 8. Further, the table shaft 8 is connected to one output shaft of a torque motor 18 fixed to the machine frame 17 via a bolt 20.

Thus, the turntable 1 can be rotated by operating the torque motor 18, and while the table 1 is rotating, the disc receiver 9 is rotated by the intake passage connecting circle fitted to the table shaft 8. It rotates while contacting the upper surface of the plate 21.

The air passage connecting disk 21 is urged upward by an elastic body (compression coil spring) 25 inserted between a groove 22 provided therein and a spring 211 provided in the support base 23. It is press-contacted to the lower surface of the disk receiver 9, and is fitted and attached to a bottle (not shown) provided upright on the support plate 23, that is, it can move up and down but cannot rotate. is installed on.

Further, the support base 23 is fixed to the upper end of a plurality of stays 26 fixed to the machine frame 17, and the pipe line 27 is connected to an intake passage 36 formed in the intake passage connecting disk 21. A suitable pipe joint such as a nipple is disposed between the two and the suction port of a vacuum pump (not shown).

For this reason, the vacuum pump can be operated to draw air from the top surface of the substrate holder 7, but the substrate holder 7 is connected to the holder base 28 fixed to the disk 6 and to the top surface of this base 28. The perforated plate support frame 29 and this support frame 29
and a perforated plate 30 fixed to the cage base 2.
An intake passage 31 bored in the disk 8 is connected to an intake passage 32 bored in the disk 6.

In addition, in FIG. 2, only one substrate holder 7 is shown, or there are 11 substrate holders 7 on the disk 6.
are mounted at equal distances from the center of the table axis 8, and are mounted at 90 degree intervals from each other.
That is, in FIG. 1, the substrate holder 7 is located at positions A, B, and D, and at a position C (printing position) below the screen attached to the print head frame 4 (
Fig. 3 Sanpuku).

Further, the turntable 1 is intermittently rotated in the direction of the arrow shown in FIG. 1, but at this time, it is maintained at a constant level by the roller guide means 33.

The roller guide means 33 is constructed by mounting rollers 35 on a bracket 34 fixed to the machine frame 17, and
, C.

Next, referring to the squeegee unit 5 attached to the print head frame 4, this unit 5 is attached to the frame of the print head frame 4, as shown in FIG. 1.3.・One end is fixed to 10 and fl! ! Ball spline t whose end is fixed to the right frame 41! 1114
2a, 42b, a frame 43 attached to both shafts 42a, 42b via a ball screw mechanism, and this frame 43.
Head fixed to (1 structure 14 and bracket t15
The air cylinder 46 is fixed to the right frame 41 via the air cylinder 46. Note that the piston rod of the air cylinder 46 and a bracket 47 fixed to the frame 43 are connected via a joint 48.

Therefore, the head mechanism 44 can be moved horizontally by moving the piston rod of the air cylinder 46 in and out.
You will be guided and moved.

The head mechanism 44 also includes a pair of air cylinders 50 and 51 in a housing 49 fixed to the frame 43.
52 through the air cylinder 50.
The scraper 53 can be moved up and down via an air cylinder 51.

For this reason, when the screen 54 is positioned in a predetermined position relative to the substrate that is suction-held by the substrate holder 7 and transferred to the mark 1j position C, and an appropriate amount of paste is supplied onto the screen 54, the air is The squeegee 52 is moved downward by the cylinder 50, and then the head mechanism 44 is horizontally moved to the right by the air cylinder 46, so that the substrate can be printed in a predetermined manner.

Note that when the head tFHI 444 is moved to the right by a predetermined stroke, the squeegee 5 is moved by the air cylinder 50.
2 is moved upward and the squeegee 52 is moved upward, the air cylinder 51 moves the scraper 53 downward, and the air cylinder 46 moves the head mechanism 44 horizontally to the left to return to its original state. When the scraper 53 is returned to the position, the air cylinder 51 moves the scraper 53 upward. In addition, screen 5
The frame body 55 to which the print head frame 4 is mounted is pressed against and fixed to the print head frame body 4 via four air cylinders 56.

Next, a support mechanism 60 supporting the print head framework 4
Specifically, this support structure 60 is composed of an XYθ table 61 and a lifting device 62, as shown in FIG. 4.5. Specifically, the XYθ table 61 is guided by a fixed table 63 fixed to the machine frame 17 and two rails 64 fixed to the table 63, and is moved in the Y-axis direction. In B-
A Y table 65 mounted so as to be movable in the D direction)
and is guided by two rails 66 fixed on this table 65 in the X-axis direction (A-C direction in the first direction)
The X table 67 is mounted so as to be movable to the gauging 68 fixed on the table 67, and the θ day pull 71 is mounted so as to be rotatable via bearings 69, 70, etc. It is configured. Note that each table is supported via a ball spline thruster connected to the output shaft of a servo motor and a ball screw mechanism.

, 2, the Y table 65 can be controlled to move to a predetermined position via a servo motor 72 fixed on the fixed table 63, and a servo motor (not shown) fixed on the Y table 65 can control the movement of the Y table 65 to a predetermined position. The X table 67 can be controlled to move to a predetermined position via a motor, and the θ table 71 can also be controlled to rotate at a predetermined angle via a servo motor 73 fixed on the X table 67.

Note that during this rotation control, the θ table 71 is guided and rotated by a rail 74 fixed on the X table 67.

On the other hand, the elevating device 62 is composed of a bracket 75 fixed on the θ table 71, an air cylinder 76 fixed to the bracket 75, and an air cylinder 77 fixed to the tip of the piston rod of the air cylinder 76. The tip of the piston rod of the air cylinder 77 is fixed to the print head frame 4.

Therefore, during printing, the print head frame 4 can be moved downward via the air cylinder 77 to position the screen 54 at a height suitable for printing (see Figure 3). The screen 54 can be moved to its original upper position by moving the framework 4 upwards.

Note that the print head frame body 4 has four guide shafts 78a to 78a.
The substrate holder 78d (two mounted in the front and rear directions in FIG. 4) moves up and down, and this control is performed every time the substrate holder 7 is transferred to the printing position Wc. While the screen 54 is being moved to the upper position, the screen 54 is aligned with the substrate being transferred to the printing position C via the XYθ table 61. The upper ends of the guide shafts 78a to 78d are fixed to the print head frame 4 and are supported by the θ table 71 so as to be able to move up and down. At this time, it is moved to a higher position via the air cylinder 76.

In FIG. 5, reference numeral 79 indicates a stopper fixed to the bracket 75, and reference numeral 80 indicates a stopper fixed to the air cylinder 77, which are made of a cushioning material.

Next, print! Regarding r3a+, the substrate 81 such as a green sheet (unfired ceramic substrate) to be stamped is fed by the operator onto the substrate holder 7 that has been transferred to the position A. Two holes 82 are bored in the substrate 81, and the substrate 81 is placed on the perforated plate 30 of the substrate holder 7 and held under suction.

Subsequently, the turntable 1 is rotated 90 degrees counterclockwise,
The substrate holder 7 at supply position A is transferred to position B. Then, the position coordinates of the hole 82 in the substrate 81 are detected by the COD cameras 2a and 2b, which are mounted and positioned at a predetermined position via an appropriate bracket, and the signal is sent to the image processing device 3, which determines the reference position coordinates. and the detected position coordinates are displayed, and based on the deviation of both position coordinates,
The Yθ table 61 is controlled in a predetermined manner. As a result, the print head frame 4 is moved from the reference position to a predetermined position in the horizontal direction, and the screen 54 is positioned at the printing position Nc.

Subsequently, the turntable 1 is rotated 90 degrees counterclockwise,
When the substrate holder 7 at position B is transferred to printing position C,
The print head framework 4 is moved downward via the air cylinder 76, and the screen 54 is positioned at a height suitable for printing. Thereafter, as described above, the substrate 81 on the substrate holder 7 is printed via the squeegee unit 5, and then, when the printing hand frame 4 is moved to the original upper position, the turntable 1 is rotated counterclockwise. The substrate holder 7 is rotated by 90 degrees, and thus the substrate holder 7 at position C is transferred to the unloading position, where an operator removes the substrate 81 on the substrate holder 7.

In this way, the substrates 81 can be successively supplied onto the substrate holder 7, which is transferred from the take-out position to the supply position A, for continuous screen printing. Note that after printing, the print head frame 4 is moved to its original upper position.
It is moved to a predetermined position in the horizontal direction via the XYθ table 61 and returned to the reference position.

[Effects of the Invention] In the present invention, the above-mentioned IJ is provided so as to be able to suction and hold the substrate and transport the substrate to the printing position via a turntable that is intermittently rotated in one direction. As a result, the equipment can be made smaller, requiring less floor space for installation, and the board can be accurately transferred to the printing position without the need for advanced control technology. obtain.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of the screen printing machine, Fig. 2 is a longitudinal sectional view of the turntable mounting part, Fig. 3 is a longitudinal sectional view of the squeegee unit mounting part, and Fig. 4 is a front view of the print head frame support mechanism. , FIG. 5t is a vertical sectional view of FIG. 4. l... Turntable, 7... Board holder, 81.
・・Substrate, C・・Printing position

Claims (1)

[Claims] A screen printing machine characterized by being configured to suction and hold substrates to be printed and to transport the substrates one after another to a printing position via a turntable that is driven to rotate intermittently in one direction.