JP2002225221A - Screen printing machine and screen printing method - Google Patents

Abstract

[PROBLEMS] To provide a screen printing machine and a screen printing method capable of improving productivity in a printing step in a cream solder printing step or the like in a circuit mounting step. SOLUTION: A plurality of stages 4 which can be moved to the carry-in position P1, the print position P2, and the carry-out position P3 are prepared in one screen printing machine 21, and a step of actually printing and other steps are performed. By carrying out in parallel and at the same time, it is possible to increase the ratio of time involved in the actual production amount, without burdening a large amount of capital investment, maintenance work, screen 2, installation area, etc. In addition, productivity can be increased by using a conventional method that is not anxious about the method.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screen printing machine and a screen printing method used in a cream solder printing step or the like in a circuit mounting step of an electronic component, and more specifically, to improve productivity at a low cost. It relates to the improvement for

[0002]

2. Description of the Related Art In the field of electronic circuit formation, in a circuit mounting process of an electronic component in which an electronic component is soldered and mounted on a substrate, cream solder is previously printed in a predetermined pattern at a predetermined position on the substrate by a screen printer. The mainstream is a cream solder printing process, where electronic components such as chip components are mounted in the next mounting process, and then the board is sent to a reflow oven where the cream solder is melted and soldered in the oven. .

Hereinafter, an example of a conventional screen printing machine used in such a cream solder printing process will be described with reference to the drawings.

FIG. 8 is a schematic plan view of a conventional screen printing machine, FIG. 9 is a schematic plan view of the screen printing machine shown in FIG. 8 with a screen omitted, and FIG. 10 is a diagram of the screen printing machine shown in FIG. FIG. 11 is a schematic front view, and FIG. 11 is a flowchart showing a processing cycle of a stage in the screen printing machine shown in FIG.

In FIGS. 8 to 10, reference numeral 1 denotes a substrate, 2 denotes a screen on which a pattern 7 is attached, 8 denotes a position confirmation camera for confirming the position of the substrate 1 with respect to the screen, and 3 denotes a screen supplied to the screen 2. Cream solder, 4
Is a stage for positioning and fixing the substrate 1 and moving up and down to just below the screen 2, 5 is a cream solder 3 on the screen 2
Is extended on the screen 2. The squeegee 5 is provided so as to be able to ascend and descend above the screen 2, and is provided so as to be horizontally movable in contact with the surface of the screen 2 when descending.

Reference numeral 9 denotes a carry-in conveyor for carrying the substrate 1 into the stage 4, and reference numeral 10 denotes a carry-out conveyor for carrying the substrate 1 from the stage 4. In addition, reference numeral 12 denotes a stage in which the stage 4 is moved between the carry-in conveyor 9 and the carry-out conveyor 10 in two directions, that is, a horizontal direction and a vertical direction in FIG. This is horizontal driving means for moving. Reference numeral 13 denotes a rotation drive unit that rotates the stage 4 in a horizontal plane.

Reference numeral 14 denotes a reference position for attaching the pattern 7 to the screen 2. Reference numeral 15 denotes a lifting drive unit that raises and lowers the stage 4 to a predetermined printing position near the lower surface of the screen 2.

Reference numeral 16 denotes a positioning control means for controlling the operations of the horizontal drive means 12, the rotary drive means 13, and the elevation drive means 15 to move and adjust the position of the stage 4.

The positioning control means 16 confirms the position of the substrate 1 with respect to the screen 2 by the position confirmation camera 8 when the substrate 1 is carried into the stage 4, and also preliminarily teaches the dimensions of the substrate 1 and the position on the screen 2. The center position of the pattern 7 on the screen 2 is calculated from the pasting reference position 14 so that the center position of the pattern 7 matches the center position of the substrate 1 and the inclination in the horizontal plane also matches. Then, a command to move the stage 4 is issued to the horizontal drive means 12 and the rotary drive means 13.

Reference numeral 11 denotes a positioning reference position when the substrate 1 is positioned and fixed on the stage 4. Pattern 7
Reference position 14 and positioning reference position 1 for substrate 1
1 overlaps with each other at the same position in a planar shape during printing.

As shown in FIG. 11, the conventional screen printing machine 19 having the above configuration repeats the processing in the order of the loading step, the printing step, and the unloading step.

In the loading step, first, the stage 4 is moved to the loading position on the loading conveyor 9 side (the position indicated by the position P1 in FIG. 9).
Then, the substrate 1 is carried into the stage 4 from the carry-in conveyor 9, and the substrate 1 is positioned and fixed at a predetermined position on the stage 4 (step S111). Then, the position of the substrate 1 with respect to the screen 2 is confirmed by the position confirmation camera 8 (step S112).

In the printing step, first, the stage 4 is horizontally moved by a distance L1 from the carry-in position so that the substrate 1 is located immediately below the printing position (the position indicated by the position P2 in FIG. 9).
The horizontal movement operation at this time is performed by the positioning control means 16 and the horizontal driving means 12 based on the output of the position confirmation camera 8 so that the center position of the pattern 7 and the center position of the substrate 1 coincide. An instruction is output to the means 13. When the horizontal movement is completed, the positioning control unit 16 issues a command to the lifting / lowering driving unit 15 to raise the substrate 1 to a position immediately below the screen 2. The horizontal movement and the vertical movement immediately below the screen constitute a substrate position correcting operation (step S113). Then, when the substrate position correcting operation is completed and the substrate 1 is positioned directly below the screen 2, the squeegee 5 moves forward on the screen 2 to one side,
The cream solder 3 is printed / applied to the substrate 1 (the squeegee 5 that has moved forward moves backward during the next printing and returns to the original print standby position) (step S114). Then, when the printing is completed, plate lifting for lowering the substrate 1 to the carry-out height is performed by the lifting drive means 15 (step S11).
5).

In the unloading step, the positioning control means 16 activates the horizontal drive means 12 and the rotary drive means 13 to move the stage 4 returned to the unloading height by the separation of the plate to the unloading position (on the unloading conveyor 10 side). (The position indicated by a position P3 in FIG. 9) is horizontally moved by a distance L2. Then, the substrate 1 on the stage 4 is carried out by the carry-out conveyor 10.

[0015]

By the way, until now,
In the circuit mounting process of electronic components, in order to improve the productivity of the electronic component mounting board, improvements mainly for improving the mounting speed of the electronic component on the board 1 have been accumulated, and corresponding results have been obtained. . However, in order to further improve productivity in the future, it is required to improve not only the mounting speed of electronic components but also the processing efficiency in the cream solder printing process described above.

[0016] The following two proposals have been examined to meet the demand for improving the processing efficiency in the cream solder printing process.

One is a proposal for improving the processing efficiency by simultaneously performing a plurality of printing steps. Specifically, the number of screen printing machines is increased to a plurality of screen printing machines, and a plurality of screen printing machines are operated simultaneously. Or to one screen printing machine,
A new screen printing machine equipped with multiple sets of print heads, stages, screens, etc., has been developed to operate each print head simultaneously.

The other is a proposal to improve the processing efficiency by increasing the operation speed of the movable part in the screen printing machine. Specifically, the proposal is to increase the speed of the movement of the print head and the printing plate. The purpose of the present invention is to increase the speed of moving the stage when moving away or when loading or unloading a substrate.

However, in the case of the former proposal, the equipment cannot be realized unless the equipment is large and there is not enough installation space in a factory or the like. In addition, the equipment investment is expensive, the economic burden is increased, and the maintenance is difficult. Problems such as doubling of work arise.

In the case of the latter proposal, it is not enough to simply improve the mechanical parts of the movable part and the driving source, and at present, the characteristics of the cream solder and the mechanism of the filling process have not been sufficiently elucidated. In addition, there is a possibility that a new problem such as deterioration of the quality of cream solder may occur due to speeding up of the plate separation and the like, and there is great anxiety in the construction method.

The present invention has been made in view of the above circumstances, has a small increase in installation space, has a light economical burden due to capital investment, etc., does not significantly increase maintenance work, and is inexpensive. Provided is a screen printing machine and a screen printing method that can improve the productivity of solder printing and do not increase the speed at which the influence on the properties of cream solder remains uncertain, and thus have high reliability for quality control and the like. The purpose is to do.

[0022]

The object of the present invention is to provide a screen printing machine for forming a pattern on a substrate by printing cream solder on a substrate positioned and fixed on a stage with a screen and a squeegee, A plurality of stages for positioning and fixing the substrate, a carry-in conveyor for carrying the substrate in a predetermined carrying direction to the stage positioned at the carry-in position, and the substrate on the stage positioned at the carry-out position in the carrying direction. The unloading conveyor for unloading along the stage, a single screen arranged at a printing position set above the horizontal movement range of each stage, and the position of the substrate loaded on the stage at the unloading position with respect to the screen are confirmed. A camera for position confirmation and a horizontal movement on the screen while touching the surface of the screen. A squeegee for printing and applying solder to a substrate at a printing position, lifting drive means for moving each stage up and down from a horizontal movement height from the loading position to the unloading position to a printing position near the lower surface of the screen, and the loading position and the unloading position Horizontal drive means for horizontally moving each stage between the positions, rotation drive means for rotating each stage in a horizontal plane, and the pattern pasting reference position on the screen and the dimensions of the substrate from the pattern on the screen. A center position is calculated, and a movement operation of the stage by the horizontal driving unit and the rotation driving unit is controlled such that the center position of the pattern is aligned with the center position of the substrate sent to a printing position. Positioning control means, wherein each of the stages includes a loading position, a printing position, and a discharging position. Navigate to, while the one stage is subjected to print processing in the printing position,
This is achieved by a screen printing machine characterized in that the movement of each stage is controlled so that another stage completes the unloading process at the unloading position or the loading process at the loading position.

Another object of the present invention is to provide a screen printing machine for forming a pattern on a substrate by printing cream solder on a substrate positioned and fixed on a stage with a screen and a squeegee. A plurality of stages, a carry-in conveyor for carrying the substrate into the stage positioned at the carry-in position along a predetermined carrying direction, and carrying out the substrate on the stage positioned at the carry-out position along the carry direction. Position confirmation for confirming the position of the carry-out conveyor, the single screen provided at the printing position set above the horizontal movement range of each stage, and the substrate with respect to the screen of the substrate carried into the stage at the carry-in position. The camera is horizontally moved on the screen while contacting the surface of the screen, and the cream solder on the screen is marked. A squeegee that prints and coats the substrate at the position, lifting and lowering drive means for raising and lowering each stage from a horizontal movement height from the carry-in position to the carry-out position to a print position near the lower surface of the screen, Horizontal drive means for horizontally moving in two directions, that is, a direction orthogonal to the transport direction, rotation drive means for rotating each stage in a horizontal plane, and supporting each stage at a predetermined separation distance in the horizontal plane, Index rotation driving means for moving each stage to a carry-in position, a print position, and a carry-out position by a rotation operation, and calculating a center position of the pattern on the screen from a pattern pasting reference position on the screen and dimensions of the substrate. So that the center position of the pattern coincides with the center position of the substrate sent to the printing position. Positioning control means for controlling the movement of the stage by the horizontal drive means and the rotation drive means and the index rotation drive means, the positioning control means, each stage, the carry-in position, printing position, unloading position Move in order, while one stage is undergoing print processing at the print position,
This is achieved by a screen printing machine characterized in that the movement of each stage is controlled so that another stage completes the unloading process at the unloading position or the loading process at the loading position.

The object of the present invention is to provide a loading step in which a substrate to be subjected to printing processing is loaded into a stage moved to a loading position, and a substrate on the stage moved from the loading position to a printing position. A screen printing machine that performs a printing process of applying cream solder by a screen and a squeegee mounted at a printing position, and an unloading process of unloading a substrate on a stage moved from the printing position to an unloading position. A screen printing method for printing and forming a cream solder pattern thereon, wherein a single screen printing machine is provided with a plurality of stages that can be moved to the carry-in position, the print position, and the carry-out position. One stage finishes the unloading process and the loading process during the printing process, and there is no space in the printing process due to the time required for the loading and unloading processes. As described above, the loading step for each stage,
This is achieved by a screen printing method characterized by setting the start timing of the printing step and the unloading step.

The screen printing method of the present invention can be easily implemented by using the above-described screen printing machine according to the present invention.

When the printing process is performed in one stage, the required time in the printing process is about 5 to 6 of the total required time when the loading process, the printing process, and the unloading process are sequentially performed.
It is about a percentage. Therefore, in the conventional screen printing machine having only one stage, the printing process is stopped during the time required for the carry-in process and the carry-out process, and only about 50 to 60% of the total required time is reduced to the actual production volume. Not involved in

However, in the screen printing machine and the screen printing method having the above-described configurations, while one stage is performing the loading process and the unloading process, another stage is performing the printing process, and the printing process is not vacant. Does not occur, the total required time is related to the actual production amount, and the production amount can be greatly improved to about 1.8 to 2 times the conventional amount.

Moreover, in terms of equipment, it is only necessary to add a stage and a drive mechanism to the conventional screen printing machine, so that the installation space is small and the economical burden due to capital investment is reduced. In addition, the maintenance work does not increase so much, and the productivity of cream solder printing can be improved at low cost.

In addition, for the moving parts, etc., the operation speed is not increased so that the influence on the properties of the cream solder remains unaffected, and the conventional operation speed which does not cause any inconvenience in the method can be achieved. There is no anxiety about the like, and high reliability equivalent to the conventional one can be maintained.

[0030]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a screen printing machine and a screen printing method according to the present invention will be described below in detail with reference to the drawings.

FIGS. 1 to 4 show a first embodiment of a screen printing machine according to the present invention. FIG. 1 shows a first embodiment of the present invention.
FIG. 2 is a schematic plan view of the screen printing machine according to the embodiment.
FIG. 3 is a schematic plan view of the screen printing machine shown in FIG. 1 with the screen omitted, FIG. 3 is a schematic front view of the screen printing machine shown in FIG. 1, and FIG. It is a flowchart which shows a processing process cycle.

The screen printing machine 21 of the first embodiment
Is a printing machine that prints cream solder 3 on a substrate 1 positioned and fixed on a stage 4 with a screen 2 and a squeegee 5. Compared with a conventional screen printing machine, two printing presses 4 for positioning and fixing the substrate 1 are provided. Correspondingly, the horizontal drive means 23 for horizontally moving the stage 4 between the carry-in position P1 and the carry-out position P3, and the positioning control means for controlling the movement operation of the stage 4 via various drive units. 25, but the other configuration is the same as the conventional one.

In the screen printing machine 21 of the first embodiment, the same components as those of the conventional screen printing machine are denoted by the same reference numerals, and description thereof will be omitted or simplified.

The horizontal drive means 23 horizontally moves each stage 4 by a linear motor. A reaction table 23a on which each stage 4 is mounted has a reaction rail 23b serving as a moving path of the stage embedded therein. Each stage 4 can move in sequence to the carry-in position P1, the position P4 immediately below the print position P2, and the carry-out position P3 along the reaction rail 23b. When returning from the carry-out position P3 to the carry-in position P1, the stage 4 is directly below the print position. Detour 23 deviating from position P4
Return with c.

The carry-in conveyor 9 carries the substrate 1 into the stage 4 positioned at the carry-in position P1 along the predetermined carrying direction, and the substrate 1 on the stage 4 positioned at the carry-out position P3 along the prescribed carry direction. Unloading conveyor 1 to unload
0, a single screen 2 provided at a print position P2 set above the horizontal movement range of each stage 4, a screen 2 of the substrate 1 carried into the stage 4 at the carry-in position P1
A position confirmation camera 8 for confirming the position of the solder paste 3 on the screen 2 while moving horizontally on the screen 2 while contacting the surface of the screen 2.
The squeegee 5 and the like for printing and applying to the two substrates 1 have the same configuration as a conventional screen printing machine.

For each stage 4, the printing position P2 near the lower surface of the screen 2 is determined from the horizontal movement height.
Lifting drive means 15 for raising and lowering to each stage, and each stage 4
Is provided with a rotation drive means 13 for rotating in a horizontal plane.

The positioning control means 25 calculates the center position of the pattern 7 on the screen 2 from the pattern pasting reference position 14 on the screen 2 and the dimensions of the substrate 1, and sends the center position of the pattern 7 to the printing position P2. The point that the movement of the stage 4 by the horizontal drive means 23 and the rotation drive means 13 is controlled so as to be in a posture corresponding to the center position of the substrate 1 is the same as the conventional one.

Positioning control means 25 in this embodiment
In addition, each stage 4 has a carry-in position P1 and a print position P
2. Move sequentially through the unloading position P3, and while one stage 4 is undergoing the printing process at the printing position P2, the remaining stages 4 complete the unloading process at the unloading position P3 and the loading process at the loading position P1. Thus, the movement of each stage 4 is controlled.

The above-described screen printing machine 21 includes a loading step of receiving the board 1 to be subjected to the printing process to the stage 4 moved to the loading position P1, and a printing process from the loading position P1 to the printing position P1.
A printing step of applying cream solder 3 to the substrate 1 on the stage 4 moved to the position 2 by the screen 2 and the squeegee 5 provided at the printing position P2;
And the unloading step of unloading the substrate 1 on the stage 4 moved from the unloading position P3 to the unloading position P3 is performed using the two stages 4. Specifically, as shown in FIG. 4 is a loading process for each stage 4 so that the other second stage 4 completes the unloading process and the loading process during the printing process, so that the printing process does not have a space due to the time required for the loading process and the unloading process. , The start timing of the printing process and the unloading process are set.

When the printing process is performed only by one stage 4, the required time in the printing process is about 50 to 60% of the total required time when the loading process, the printing process, and the unloading process are sequentially performed. is there. Therefore, in the conventional screen printing machine 21 having only one stage 4, the printing process is suspended during the time required for the carry-in process and the carry-out process, and only about 50 to 60% of the total required time is reduced. Not involved in production.

However, in the screen printing method using the screen printing machine 21 according to the first embodiment, while one stage 4 performs the loading process and the unloading process, another stage 4 performs the printing process. Since no space is generated in the printing process, the total required time is related to the actual production amount, and the production amount can be greatly improved to about 1.8 to 2 times the conventional amount.

In addition, in terms of equipment, the stage 4 and its driving mechanism need only be added to the conventional screen printing machine 21, so that the installation space is not increased, and
The economical burden due to capital investment and the like is light, the maintenance work is not increased so much, and the productivity of cream solder printing can be improved at low cost.

In addition, since the speed of the movable portion and the like is not increased because the influence on the characteristics of the cream solder 3 remains unaffected, the conventional operation speed can be achieved without any inconvenience in the construction method. There is no concern about management and the like, and high reliability equivalent to the conventional one can be maintained.

FIGS. 5 to 7 show a second embodiment of the screen printer according to the present invention, and FIG. 5 shows the second embodiment of the present invention.
FIG. 6 is a schematic plan view of the screen printing machine according to the embodiment, and FIG.
And FIG. 7 is a schematic front view of the screen printing machine shown in FIG. 5 with the screen omitted.

The screen printing machine 31 of the second embodiment
Are two stages 4 for positioning and fixing the substrate 1, a carry-in conveyor 33 for carrying the substrate 1 along the predetermined carrying direction to the stage 4 positioned at the carry-in position P1, and a stage 4 positioned at the carry-out position P3. An unloading conveyor 35 for unloading the upper substrate 1 in a predetermined transport direction, a single screen 2 arranged at a printing position P2 set above the horizontal movement range of each stage 4, and an unloading position P1
And a position confirmation camera 8 for confirming the position of the substrate 1 carried into the stage 4 with respect to the screen 2, and moving the cream solder 3 on the screen 2 by moving horizontally on the screen 2 while contacting the surface of the screen 2. A squeegee 5 for printing and applying to the substrate 1 at the printing position P2, an elevating drive means 15 for moving each stage 4 up and down from a horizontal movement height from the loading position P1 to the unloading position P3 to a printing position P2 near the lower surface of the screen 2. A horizontal drive unit 37 for horizontally moving each stage 4 in two directions, that is, a direction in which the substrate 1 is transported and a direction orthogonal to the transport direction; a rotary drive unit 13 for rotating each stage 4 in a horizontal plane; And a positioning control unit 39 for controlling the moving operation of the first embodiment. The basic configuration is substantially the same as that of the first embodiment.

However, in the case of the present embodiment, an index rotation driving means 41 is provided. The index rotation drive means 41 supports the two stages 4 at a predetermined separation distance on a table 41b rotatable around a central axis 41a in a horizontal plane. The two stages 4 are supported at positions opposing each other with the center axis 41a interposed therebetween. One stage 4 is positioned at the carry-in / out position P5 by the 180 ° rotation of the table 41b, and the other stage 4 is It is positioned at the position P6 immediately below printing.

The carry-in / out position P5 is a carry-in position for receiving the substrate 1 from the carry-in conveyor 33, and the carry-in / out position P5
Is also used as a carry-out position for carrying out. The carry-in conveyor 33 and the carry-out conveyor 35 are formed so as to be able to advance and retreat toward the carry-in / out position P5. As shown in FIG. 5, when the table 41b is rotated, the carry-out conveyor 33 and the carry-out conveyor 35 are out of the rotation range of the table 41b. To leave.

The positioning control means 39 calculates the center position of the pattern on the screen 2 from the reference position for pasting the pattern on the screen 2 and the dimensions of the substrate 1, and the center position of the pattern is sent to the printing position. The horizontal driving means 3 is set so as to have an attitude matching the center position.
7 and the movement of the stage 4 by the rotation driving means 13 and the index rotation driving means 41 are controlled. Further, the positioning control means 39 of the present embodiment indicates that each stage 4 sequentially goes around the carry-in / out position P5 and the print position P6, and while one stage 4 is undergoing print processing at the print position P6, the other stage 4 4 controls the movement of each stage 4 so that the carry-out process and the carry-in process at the carry-in / out position P5 are completed.

Also in the case of the second embodiment, specifically,
As in the case of the first embodiment, as shown in FIG. 4, one of the first stages 4 is operated during the printing process.
After completing the unloading and loading processes, make sure that there is no space in the printing process due to the time required for the loading and unloading processes.
The start timings of the loading / unloading process and the printing process are set for each stage 4.

In the case of the second embodiment, as in the case of the first embodiment, the increase in installation space is small, the economical burden due to capital investment and the like is small, and the maintenance work is also significantly increased. Without this, the productivity of cream solder printing can be improved at low cost.

In addition, the speed of the movable portion and the like is not increased so that the influence on the characteristics of the cream solder 3 remains unreliable, and the conventional operation speed can be achieved without concern about the construction method. There is no concern about management and the like, and high reliability equivalent to the conventional one can be maintained.

Further, in the case of the second embodiment, the index rotation driving means 41 is employed to exchange the stages 4 between the carry-in / out position P5 and the printing position P6 by rotating the table 41b. As compared with the case where the stage is sequentially moved to the carry-in position P1, the print position P2, and the carry-out position P3 by linear movement, the moving range of the stage is narrower, and the size of the entire apparatus can be reduced.

In the second embodiment, the carry-in / out position is used as the carry-in position and the carry-out position. However, even when the stage is horizontally moved by rotating the table 41b, the carry-in position and the carry-out position are used. May be set independently of each other.

In each of the above embodiments, two stages are used.
A configuration using three or more stages is also possible.

The specific configuration of the horizontal drive means for horizontally moving each stage is not limited to the configuration disclosed in the above embodiment, and various known means can be used. For example, a configuration of a free flow system, a configuration in which a plurality of XY tables are combined, or the like can be adopted.

[0056]

According to the screen printing machine and the screen printing method of the present invention, while one stage is performing the loading process and the unloading process, another stage is performing the printing process. Since no space is generated, the total required time is related to the actual production amount, and the actual operation time of the printing process is about 50 to 60% of the total required time. By comparison, the production amount can be greatly improved to about 1.8 to 2 times the conventional amount.

Moreover, in terms of equipment, only a stage and its drive mechanism need to be added to the conventional screen printing machine, so that an increase in installation space is small, and the economic burden due to capital investment and the like is reduced. In addition, the maintenance work does not increase so much, and the productivity of cream solder printing can be improved at low cost.

In addition, for the movable parts, etc., since the speed is not increased so that the influence on the properties of the cream solder remains unaffected, it is possible to achieve the conventional operating speed which is not uneasy in the construction method. There is no anxiety about the like, and high reliability equivalent to the conventional one can be maintained.

[Brief description of the drawings]

FIG. 1 is a schematic plan view of a first embodiment of a screen printing machine according to the present invention.

FIG. 2 is a schematic plan view of the screen printing machine shown in FIG. 1 in a state where a screen is omitted.

FIG. 3 is a schematic front view of the screen printing machine shown in FIG.

FIG. 4 is a flowchart showing a processing cycle of a stage in the screen printing machine shown in FIG. 1;

FIG. 5 is a schematic plan view of a second embodiment of the screen printing machine according to the present invention.

6 is a schematic plan view of the screen printing machine shown in FIG. 5 in a state where a screen is omitted.

FIG. 7 is a schematic front view of the screen printing machine shown in FIG.

FIG. 8 is a schematic plan view of a conventional screen printing machine.

9 is a schematic plan view of the screen printing machine shown in FIG. 8 in a state where a screen is omitted.

FIG. 10 is a schematic front view of the screen printing machine shown in FIG.

FIG. 11 is a flowchart showing a processing cycle of a stage in the screen printing machine shown in FIG. 8;

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 board 2 screen 3 cream solder 4 stage 5 squeegee 8 position confirmation camera 9 carry-in conveyor 10 carry-out conveyor 13 rotation drive means 15 elevating drive means 21 screen printing machine 23 horizontal drive means 23a table 23b reaction rail 25 positioning control means 31 screen printing Machine 33 carry-in conveyor 35 carry-out conveyor 37 horizontal drive means 39 positioning control means 41 index rotation drive means 41a central axis

Claims (3)

[Claims] A substrate fixed to a stage is fixed on a stage.
What is claimed is: 1. A screen printing machine for printing cream solder on a screen and a squeegee to form a pattern on a substrate, comprising: a plurality of stages for positioning and fixing the substrate; And a carry-out conveyor for carrying out the substrate on the stage positioned at the carry-out position along the carrying direction, and a printing position set above the horizontal movement range of each stage. A single screen, a position confirmation camera for confirming the position of the substrate carried into the stage at the carry-in position with respect to the screen, and the screen moving horizontally on the screen while contacting the surface of the screen. A squeegee for printing and applying the cream solder on the substrate at the printing position, and moving each stage out of the loading position Lifting drive means for raising and lowering from the horizontal movement height to the position to the printing position near the lower surface of the screen, horizontal driving means for horizontally moving each stage between the carry-in position and the carry-out position, and each stage in a horizontal plane. Rotation driving means to rotate in, calculate the center position of the pattern on the screen from the pattern pasting reference position on the screen and the dimensions of the substrate,
Positioning control means for controlling the movement of the stage by the horizontal driving means and the rotation driving means, so that the center position of the pattern is aligned with the center position of the substrate sent to the printing position, The positioning control means, each stage sequentially moves the carry-in position, the print position, the carry-out position, and while one stage is undergoing print processing at the print position, the other stage carries out carry-out processing at the carry-out position. A screen printing machine characterized by controlling the movement of each stage so as to complete the loading process at the loading position. 2. A substrate positioned and fixed on a stage,
What is claimed is: 1. A screen printing machine for printing cream solder on a screen and a squeegee to form a pattern on a substrate, comprising: a plurality of stages for positioning and fixing the substrate; And a carry-out conveyor for carrying out the substrate on the stage positioned at the carry-out position along the carrying direction, and a printing position set above the horizontal movement range of each stage. A single screen, a position confirmation camera for confirming the position of the substrate carried into the stage at the carry-in position with respect to the screen, and the screen moving horizontally on the screen while contacting the surface of the screen. A squeegee for printing and applying the cream solder on the substrate at the printing position, and moving each stage out of the loading position Lifting drive means for raising and lowering from a horizontal movement height up to the position to a printing position near the lower surface of the screen, and horizontal drive means for horizontally moving each stage in two directions, a transport direction of the substrate and a direction orthogonal to the transport direction. A rotation driving means for rotating each stage in a horizontal plane, and an index for supporting each stage at a predetermined separation distance in the horizontal plane and moving each stage to a carry-in position, a print position, and a carry-out position by its own rotation operation. Rotation driving means, calculating the center position of the pattern on the screen from the pattern pasting reference position on the screen and the dimensions of the substrate, the center position of the pattern to the center position of the substrate sent to the printing position The horizontal drive unit, the rotation drive unit, and the index rotation drive unit are configured to have the same posture. Positioning control means for controlling the movement operation of the stage, wherein each of the stages sequentially moves in a carry-in position, a print position, and a carry-out position, and one stage receives print processing at a print position. A screen printing machine characterized in that the movement of each stage is controlled so that another stage completes the unloading process at the unloading position and the unloading process at the unloading position. 3. A loading step of receiving a substrate to be subjected to a printing process to the stage moved to the loading position, and a screen provided at the printing position for the substrate on the stage moved from the loading position to the printing position. And a printing process of applying cream solder by a squeegee, and an unloading process of unloading the board on the stage moved from the printing position to the unloading position, with one screen printing machine, the pattern of the cream solder on the board. A screen printing method for forming a print, wherein a single screen printing machine is provided with a plurality of stages movable to the carry-in position, the print position, and the carry-out position, and one stage is used during a printing process. Each stage completes the unloading process and the loading process, so that there is no space in the printing process due to the time required for the loading process and the unloading process. Entry process, the printing process, a screen printing method characterized by setting the start timing of the unloading step.