JPH06166166A - Printed matter transport device of screen printer - Google Patents

Abstract

PURPOSE:To provide a printed matter transport device of a screen printer which is capable of transporting printed matter ranging from minimum to maximum in such a manner that printed matter, a screen plate and a squeegee are all centered, then positioning/fixing them and, allowing pressure to be applied well in balance during printing, with high printing accuracy and stability. CONSTITUTION:The printed matter transport device of screen printer is composed of robots 32, 34 which activate a loader part 24 and an unloader part 26 so that the center of a state part 23 for width adjustment based on a center transport reference and the center of the loader part 24 for width adjustment based on a lateral transport reference are matched. Thus it is possible to align the centers of a screen plate 26 and printed matter always so that data can be printed with high printing accuracy due to well-balanced pressure application.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fully automatic screen printing apparatus for printing a printing paste such as a conductor paste or cream solder with high accuracy on an object to be printed such as a printed circuit board in the electronic circuit board mounting process.

[0002]

2. Description of the Related Art In recent years, a screen printing machine has been used in a cream solder printing process in a circuit mounting process of an electronic component. Correspondingly, high precision printing of cream solder has been required. Hereinafter, an example of a conventional printing material conveying device for a screen printing machine will be described with reference to the drawings.

In FIG. 5, 1 is a printed material, 2 is a stage portion for positioning and fixing the printed material 1, 3 is a loader portion for carrying the printed material 1 into the stage portion 2, and 4 is a stage portion 2.
Unloader unit for carrying out the printed substrate 1 in
Reference numeral 5 denotes a screen plate, and the printing pattern of the screen plate 5 is attached such that the end face of the object 1 to be printed on the stage 2 and the front line of the printing pattern of the screen plate 5 are aligned so that they can be conveyed. It corresponds to a predetermined minimum size to a maximum size of the printed matter 1, and at the maximum, the center of the substrate 1 and the center of the screen plate 5 are aligned (hereinafter, printing of the screen plate 5 is performed. The stage part 2 supports the front end surface of the printing target 1 and a fixed rail 6 having a conveying means, and the other end surface of the printing target 1, and the fixed rail. 6, a movable rail 7 having a conveying means capable of reciprocating in a direction (hereinafter, Y direction) substantially perpendicular to the conveying direction, a ball screw 8 connected to the movable rail 7, and a ball. A bearing 9, 10 fitted with a di-8 rotatably, a drive source 11 for operating the movable rail 7,
A pulley 12 connected to the ball screw 8, a pulley 13 connected to the drive source 11, a belt 14 for transmitting power between the pulleys 12 and 13, a control device 15a for controlling the drive source 11, and a movable rail 7 are supported. Guide 16a,
16b, located between the fixed rail 6 and the movable rail 7,
It is composed of a suction block (not shown) having a plurality of holes connected to a negative pressure source such as a vacuum pump (not shown) (hereinafter, the transfer reference of the stage unit 2 is referred to as the front transfer reference). ). The loader unit 3 supports a front end surface of the printing target 1 and has a fixed rail 17 having a conveying unit.
And a movable rail 18 that supports the other end surface of the printed material 1 and that is movable in parallel with the fixed rail 17 in the Y direction according to the dimensions of the printed material 1 and that has a conveying means.
A robot 19 that reciprocates the movable rail 18 in the Y direction.
(Hereinafter, the transport standard of the loader unit 3 is referred to as the front standard). The unloader unit 4 supports the front end surface of the printing target 1, and also supports the fixed rail 20 having a conveying means and the other end surface of the printing target 1, and
It is parallel to the fixed rail 20 according to the size of the substrate 1 and Y
Movable rail 2 that can be moved in any direction and that has a conveying means
1 and a robot 22 that reciprocates the movable rail 21 in the Y direction (hereinafter, the transport standard of the unloader unit is referred to as the front standard). Further, a printing paste (not shown) is supplied on the screen plate 5, and the printing paste (not shown) is printed on the substrate 1 above the stage portion 2 while contacting the screen plate 5. There is a squeegee (not shown), and the squeegee (not shown) is arranged so that the center of the substrate 1 and the center of the squeegee 1 coincide with each other when the substrate 1 has the maximum size. In addition, a transport line (not shown) in the front-back process in the transport device of the conventional screen printing machine is a front transport reference that can be width-adjusted with the front end surface of the printing target 1 as a reference.

The operation of the conventional printing material conveying device for a screen printing machine having the above-described structure will be described below. In the conventional printing material conveying device of the screen printing machine, the fixed rails 6, 17, 20 are arranged so that the conveying width can be changed according to the size of the printing material 1 in order to match the front conveyance reference of the front and rear processes (not shown). With reference to, the movable rails 7, 18, and 21 are varied to adjust. In the stage unit 2, the operation is performed by controlling the movable rail 7 of the stage unit 2 according to the size of the printed material 1 by the control device 15
The drive source 11 is controlled by a to rotate the ball screw 8 and move the movable rail 7 in the Y direction to adjust the conveyance width.
Further, the operation of the movable rail 18 of the loader unit 3 and the movable rail 21 of the unloader unit 4 adjusts the conveyance width by operating the robots 19 and 22 in the Y direction according to the size of the printing target 1.

Thereafter, the substrate 1 conveyed to the loader section 3 from the apparatus (not shown) in the previous step is transferred from the fixed rail 17 and the movable rail 18 of the loader section 3 to the fixed rail 6 and the movable rail 7 of the stage section 2. After being conveyed, the printing block 1 is positioned and fixed by a suction block (not shown), and then a printing operation is performed to print paste (not shown) on the printing plate 1.
Is printed. After that, the printed substrate 1 is conveyed from the stage unit 2 to the unloader unit 4 and the unloader unit 4
The fixed rail 20 and the movable rail 21 are carried out to a device (not shown) for the next step.

[0006]

However, in the above-mentioned configuration, the loader portion 3, the stage portion 2, and the unloader portion 4 can change the carrying width according to the size of the material to be printed 1 in accordance with the carrying line in the front-back process. Movable rails 7, 18, 21 with fixed rails 6, 17, 20 as reference
Since it is a front conveyance reference that varies, the screen plate 5 is restricted by the front conveyance reference. Therefore, at the maximum size of the substrate 1, the center of the substrate 1 coincides with the center of the squeegee (not shown) and the center of the screen plate 5, but when the substrate 1 has a size other than the maximum size, Since the center, the center of the squeegee (not shown) and the center of the screen plate 5 do not coincide,
There is a problem in that stable and high-precision printing cannot be performed because a balanced pressure is not applied.

In view of the above problems, the present invention has a center of the substrate 1 and a squeegee (not shown) of the substrate 1 from the minimum size to the maximum size without being restricted by the front conveyance standard of the front-back process line (not shown). (2) The center of the screen plate 5 and the center of the screen plate 5 are aligned and fixed so that the pressure is balanced during printing, thereby enabling highly accurate and stable printing. The purpose is to provide a device.

[0008]

According to the present invention, in a screen printing machine, the center of a printing pattern is processed so as to coincide with the center of a screen plate, and the positioning means makes it possible to position the printed material and the printing pattern at the same position. The stage section is arranged in the stage, and the positions of the loader section and the unloader section are reciprocally moved from the position at the time of transfer so that the positions of the transfer rails of the loader section and the unloader section coincide with the transfer rails of the stage section. This is possible, or the position of the stage part can be reciprocally moved from the position at the time of conveyance to a position where the material to be printed and the print pattern match.

[0009]

According to the present invention, the loader section and the unloader section based on the front side are arranged so that the center of the printed material on the stage section and the loader section are different from the stage section based on the central conveyance standard.
Either move the unloader section so that the center of the printed material is aligned, or make sure that the stage section, which is the same reference as the loader section and unloader section, matches the center of the printed material on the stage section and the center of the screen plate. By moving the center of the screen plate and the center of the printing pattern, the transport reference of the loader and unloader section is set to the same front reference as the line in the front-back process, and regardless of the size of the print target. Since the printing can be performed so that the center of the printed matter, the center of the screen, and the center of the squeegee coincide with each other, the pressure of the squeegee applied during printing becomes uniform, and stable high-precision printing is possible.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to the drawings on a printing material conveying device for a screen printing machine. First, FIG. 1 is a schematic plan view of a main part of a screen printing apparatus according to a first embodiment of the present invention.
Further, the components having the same functions as those of the conventional substrate conveying device for a screen printing machine in FIG. 5 are designated by the same reference numerals as the schematic plan view of the main part of the conventional substrate conveying device for a screen printer shown in FIG. Therefore, description of the same components will be omitted, and the operation description will be simplified. In FIG. 1, reference numeral 23 denotes a stage portion for positioning and fixing the printing material 1, 24 is a loader portion for loading the printing material 1 into the stage portion 23, 25 is an unloader portion for unloading the printing material 1 in the stage portion 23, and 26 is With the screen plate, the printing pattern of the screen plate 26 is pasted from the minimum size of the printable substrate 1 that can be carried, with reference to the center of the printing plate 1 on the stage portion 23 and the center of the printing pattern of the screen plate 26. It supports up to the maximum size (hereinafter, screen version 2
The paste reference of the print pattern of No. 6 is called the central reference). The stage portion 23 is provided at the center of the screen plate 26 and the substrate 1.
The conveyance width is parallel and the position where the center of the
Movable rails 27a and 27b that can be changed in a direction (hereinafter, Y direction) substantially perpendicular to the conveyance direction of the substrate 1, and the stage unit 2
A ball screw 28 having screws in the forward and reverse directions with respect to the middle point for moving the movable rails 27a and 27b of No. 3 symmetrically, and a controller 15b for controlling the drive source 11.
Guides 29a and 29b for supporting the movable rail 27a,
Guides 30a and 30b for supporting the movable rail 27b,
Bearings 9 and 10, drive source 11, pulleys 12 and 13,
14 and a suction block (not shown) (hereinafter, the transport standard of the stage unit 26 is referred to as the central transport standard). The loader unit 24 reciprocates the table 31 that supports the fixed rail 17 and the movable rail 18, and the robot 32 that reciprocates the table 31 and aligns the center of the substrate 1 and the center of the screen plate 26 in the front-side loader unit 24.
And fixed rail 17, movable rail 18, robot 19
(Hereinafter, the transport standard of the loader unit 24 is referred to as the front transport standard). The unloader unit 25 includes a table 33 that supports the fixed rail 20 and the movable rail 21,
The robot is configured to reciprocate the table 33 to align the center of the object to be printed 1 in the unloader unit 25 on the front side with the center of the screen plate 26, a fixed rail 20, a movable rail 21, and a robot 22. (Less than,
The transport standard of the unloader unit 25 is referred to as the front transport standard). A printing paste (not shown) is supplied on the screen plate 26, and the printing paste (not shown) is printed on the substrate 1 above the stage portion 23 while contacting the screen plate 26. There is a squeegee (not shown), and the center of the stage portion 23 and the center of the squeegee (not shown) are arranged to coincide with each other.

The operation of the screen printing apparatus having the above-described structure according to the embodiment of the present invention will be described below.

The fixed rail 1 in front of the screen plate 26, which is the central reference, is fixed to the stage portion 23 which is synchronized with the center of a squeegee (not shown) in the Y direction.
The loader section 24 and the unloader section 25 that move the movable rails 18 and 21 on the basis of Nos. 7 and 20, and the position of the center of the substrate 1 in the loader section 24 and the unloader section 25 is the stage section. The loader section 24 and the unloader section 25 are moved in the Y direction so as to be aligned with the center of 23 and the center of the screen plate 26. 2 (a) to 2 (e) are operation diagrams of the first embodiment of the printing material conveying device for a screen printing machine, and FIG. 1 and FIGS. 2 (a) to 2 (e) are shown. It demonstrates using. First, before carrying in the material to be printed 1, the movable rails 27a and 27b of the stage unit 23 are controlled in advance by the control device 15b according to the size of the material to be printed 1 by controlling the drive source 11 to rotate the ball screw 28 to move the movable rails 27a and 27b. Move symmetrically to adjust the conveyance width. The movable rails 18 of the loader section 24 and the movable rails 21 of the unloader section 27 are also adjusted by the robots 19 and 22 in accordance with the dimensions of the material to be printed 1. After that, as shown in FIG. 2A, the substrate 1 is carried into the rails 17 and 18 of the loader unit 24 from the apparatus of the previous step (step 1), and then the robot 32 is transferred to the robot 32 as shown in FIG. 2B.
Thus, the table 31 is moved in the Y direction so that the center of the substrate 1 and the center of the stage portion 23 (screen plate 26) are aligned with each other (step 2). Next, as shown in FIG. 2C, the substrate 1 is conveyed to the movable rails 27a and 27b of the stage portion 23, where the substrate 1 is positioned and fixed by a suction block (not shown), and then the printing operation is performed. Printed material 1
A printing paste (not shown) is printed on (step 3). After that, as shown in FIG. 2D, the table 33 is moved in advance in the Y direction by the robot 34 so that the midpoint between the fixed rail 20 and the movable rail 21 coincides with the center of the stage unit 23 (screen plate 26). The printed substrate 1 is conveyed to the unloader unit 25 (step 4), and the robot 34 returns the table 33 to the reference position for conveying the substrate with another device as shown in FIG.
The material to be printed 1 is unloaded (step 5).

As described above, according to this embodiment, the loader section 24 and the unloader section 22 based on the front conveyance reference are arranged with respect to the stage section 23 based on the center, and the center of the substrate 1 and the loader section 27 of the stage section 23 are compared. Since the printed matter 1 of the unloader section 28 and the unloader section 28 are movable so that the centers thereof match, the screen plate 26 can be attached so that the center of the printing pattern is the center, and the loader section 24 and the unloader section 25 can be attached.
While the conveyance reference of No. 1 is the same as the conveyance reference of other lines, the center of the substrate 1 and the center of the screen plate 26, that is, the center of the squeegee (not shown) match regardless of the size of the substrate 1. As described above, the pressure of the squeegee (not shown) applied to the printing object 1 at the time of printing is balanced, and stable and highly accurate printing can be performed.

Next, a second embodiment of the present invention will be described with reference to the accompanying drawings, which shows a printing material conveying device for a screen printing machine. First, FIG. 3 is a schematic plan view of a main part of a screen printing apparatus according to the second embodiment of the present invention. Further, the components having the same functions as those of the conventional substrate conveying device for a screen printing machine in FIG. 5 are designated by the same reference numerals as the schematic plan view of the main part of the conventional substrate conveying device for a screen printer shown in FIG. Therefore, description of the same components will be omitted, and the operation description will be simplified. In FIG. 3, reference numeral 35 denotes a stage portion for positioning and fixing the print substrate 1, 3 is a loader portion, 4 is an unloader portion, 26 is a screen plate stage portion 35, a fixed rail 6, a movable rail 7 and a suction block (not shown). A table 36 supporting the table 36, a robot 37 for moving the table 36, a fixed rail 6, a movable rail 7,
Ball screw 8, bearings 9 and 10, drive source 11, pulleys 12 and 13, belt 14, and controller 15a.
And a suction block (not shown). The loader unit 3 includes a fixed rail 18, a movable rail 19, and a robot 20. The unloader unit 4 is composed of a fixed rail 21, a movable rail 22 and a robot 23. A printing paste (not shown) is supplied on the screen plate 5, and a squeegee for printing the printing paste (not shown) on the printing object while contacting the screen plate 5 above the stage portion 2. (Not shown), which is positioned so that the center of the substrate 1 and the center of the squeegee (not shown) coincide with each other when the substrate 1 has the maximum size.

The operation of the printing material conveying device for a screen printing machine constructed as described above will be described below.
The loader unit 3, the unloader unit 4, and the stage unit 38 are
Fixed rails 6, 18 in front of the size of the substrate 1
With reference to 21, the movable rails 7, 19 and 22 to be moved later are moved to perform the width-shifting operation. The stage unit 38 is movable in the Y direction so that the center of the printing plate 1 of the stage unit 38 and the center of the screen plate 29 coincide with the screen plate 29 that is the center reference.

FIGS. 3 (a) to 3 (e) are operation diagrams of the second embodiment of the printing material conveying device for a screen printing machine, and FIGS. 3 and 4 (a) to 4 (e) are shown. It demonstrates using. First, before the substrate 1 is carried in, the control unit 15 controls the drive source 11 of the movable rail 7 of the stage unit 38 in advance according to the size of the substrate 1, and the ball screw 8 is rotated to move the movable rail 7 in the Y direction. Move to adjust the transport width. The movable rails 18 of the loader unit 4 and the movable rails 22 of the unloader unit 3 also adjust the conveyance width by operating the robots 20 and 23 in the Y direction according to the dimensions of the printing target 1. Thereafter, as shown in FIG. 4A, the substrate 1 is carried into the fixed rail 17 and the movable rail 18 of the loader section 3 from the device (not shown) in the previous step (step 6), and then, in FIG. ), It is conveyed to the fixed rail 6 and the movable rail 7 of the stage part 35, and the print substrate 1 is positioned and fixed there by a suction block (not shown) (step 7). Thereafter, as shown in FIG. 4C, the table 36 is moved in the Y direction by the robot 37 so that the center of the substrate 1 positioned and fixed to the stage portion 35 coincides with the center of the screen plate 26, and printing is performed there. The operation is performed and the printing paste (not shown) is printed on the substrate 1 (step 8). After that, as shown in FIG. 4D, the stage unit 35 is returned to the transportation reference (step 9), and the printed substrate 1 is movable with the fixed rail 21 of the unloader unit 4 as shown in FIG. 4E. It is carried out from the rail 22 to an apparatus (not shown) for the next process (step 10).

As described above, according to the present embodiment, the center of the object 1 to be printed on which the front reference stage portion 35 is located on the stage portion as well as the loader portion 3 and the unloader portion 4 are aligned with the center of the printing pattern of the screen plate 26. Stage part 3
2 is movable, the screen plate 26 is attached so that the center of the screen plate 23 becomes the center of the printing pattern.
Also, while keeping the transport standard of the loader unit 24 and the unloader unit 25 the same as the transport standard of other lines, the center of the substrate 1 and the center of the screen plate 26 regardless of the size of the substrate 1, That is, a squeegee (not shown)
Since the centers of the squeegees can be moved so as to coincide with each other, the pressure of a squeegee (not shown) applied to the printing target object 1 at the time of printing is balanced, and stable and highly accurate printing can be performed.

[0018]

According to the present invention having the above-described structure, the loader section and the unloader section based on the front side are arranged such that the center of the printed matter on the stage section and the loader section and the unloader section are covered with respect to the stage section based on the center conveyance. By moving so that the center of the printed matter matches, or by moving the stage part of the same front reference as the loader part and the unloader part so as to match the center of the printed material on the stage part and the center of the screen plate, By aligning the center of the screen plate with the center of the printing pattern, keeping the transport standard of the loader and unloader section the same as the front-back process line, the center of the substrate and the screen regardless of the dimensions of the substrate. Since the center of the squeegee and the center of the squeegee can be printed so that they match, the pressure applied by the squeegee during printing is uniform. It becomes, thereby enabling stable high-precision printing.

[Brief description of drawings]

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

FIG. 2 (a) is a state diagram showing an operation flow step 1 in the first embodiment of the present invention (b) is a state diagram showing an operation flow step 2 in the first embodiment of the present invention (c) State diagram showing operation flow step 3 in the first embodiment of the present invention (d) is a state diagram showing operation flow step 4 in the first embodiment of the present invention (e) is the first embodiment of the present invention State diagram showing operation flow step 5 in FIG.

FIG. 3 is a schematic plan view of a main part of a printing material conveying device for a screen printing machine according to a second embodiment of the present invention.

4A is a state diagram showing an operation flow step 6 in the second embodiment of the present invention, FIG. 4B is a state diagram showing an operation flow step 7 in the second embodiment of the present invention, and FIG. State diagram showing operation flow step 8 in the second embodiment of the present invention (d) is a state diagram showing operation flow step 9 in the second embodiment of the present invention (e) is the second embodiment of the present invention State diagram showing operation flow step 10 in FIG.

FIG. 5 is a schematic plan view of a main part of a conventional material conveying device for a screen printing machine.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Printed material 11 Drive source 15b Control device 17,20 Fixed rail 18,21 Movable rail 19,22,32,34 Robot 23 Stage part 24 Loader part 25 Unloader part 26 Screen version 27a, 27b Movable rail 28 Ball screw

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takao Naito 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (2)

[Claims] 1. An object to be printed, comprising: a means for carrying an object to be printed, which comprises a pair of carrying routes having a variable carrying width; a stage section having positioning means for the object to be printed; and a carrying means similar to the stage section. In a screen printing machine having a loader part for supplying the stage part to the stage part, an unloader part for discharging from the stage part, and a screen plate having a print pattern for printing cream solder only at a predetermined position on the substrate. The center of the printing pattern is processed so as to match the center of the screen plate, and the positioning means arranges a stage part at a position where the printed material and the printing pattern match, and the loader part and the unloader part are arranged. The loader section and the unloader section so that the position of the transfer rail of the same is aligned with the transfer rail of the stage section. The apparatus for transporting an object to be printed of a screen printing machine, characterized in that the position of can be reciprocated from the position at the time of transportation. 2. A conveyance means for a printing medium, which comprises a pair of conveyance rails having a variable conveyance width, a stage section having positioning means for the printing medium, and a conveyance means similar to the stage section. A loader unit for supplying a printed matter to the stage unit, a transfer unit similar to the stage unit, an unloader unit for discharging from the stage unit, and a cream solder for printing the cream solder only at a predetermined position on the substrate. In a screen printing machine provided with a screen plate having a printing pattern, the center of the printing pattern is processed so as to match the center of the screen plate, and the position of the stage part at a position where the printing material and the printing pattern match. An object-to-be-conveyed device for a screen printing machine, which is capable of reciprocating from a position at the time of conveyance.