JP3303177B2 - Screen printing method, mask used in the printing method, and apparatus for mounting and fixing printed material - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screen printing method suitable for printing a group of line figures which are parallel to each other and have a small distance from each other, and an entire pattern having the groups at predetermined positions on a single printing material. The present invention relates to a mask used in the screen printing method and an apparatus for mounting and fixing a printing material suitable for performing the screen printing method.

[0002]

2. Description of the Related Art In screen printing, cream solder, ink, and the like are placed on a mask having a predetermined pattern formed by a large number of screen holes, and squeegees are slid into contact with each other to extrude cream solder, ink, etc. from the screen holes to form a mask. This is a printing method in which the image is transferred to a printing material fixed below.

In such a conventional method, for example, FIG.
As shown in FIG. 1, an entire pattern C composed of a number of figures B, B, B,.
Also, when printing a group of line figures D that are parallel to each other and have a narrow interval, a screen hole in which a group of line figures are mixed in the whole pattern is formed as shown in FIG. Printing will be performed using a mask.

However, in the case of such a mask, since the squeegee slides uniformly on the entire surface of the entire pattern, the applied amount of cream solder, ink, or the like is too large in the portion of the group of line figures D. Will be. Further, because of this, cream solder, ink, and the like spread laterally on the back side of the mask, and since these line figures have extremely small intervals, adjacent lines may be connected to each other.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and has been made in consideration of the above-mentioned problems, and a group of line figures and an entire pattern are separately printed before and after, and a cream solder is formed on the group of line figures. Screen printing that makes it possible to print the whole pattern including a group of line figures clearly without bleeding on one sheet of printing material, by making the application amount of ink or the like smaller than that of the whole pattern. It does not provide a law.

Another object of the present invention is to provide a mask used in the screen printing method according to the present invention and a device for mounting and fixing a printing material suitable for performing the screen printing method according to the present invention.

[0007]

SUMMARY OF THE INVENTION Accordingly, the gist of the present invention is that a group of line figures which are parallel and have a small mutual interval and a whole pattern including the same at a predetermined position are printed on one sheet. In a screen printing method for printing a group of line figures, a mask provided with the screen holes for printing the group of line figures separated from the screen holes for printing the whole pattern is used. Screen printing method, wherein the printing is performed with a small amount of coating, and then the entire pattern is printed so that cream solder, ink, etc. of a group of linear figures applied to the printing material do not adhere to the back surface of the mask. It is in.

Further, in carrying out the above printing method, a group of screen holes for printing a line figure which are parallel and at a small interval from each other, and a screen hole for printing the whole pattern are provided at required intervals. Further, the portion of the screen hole for printing of the group of line figures is made thin by shaving the surface side on which the cream solder, the ink, etc. are placed, while the group of line figures between the printing screen holes of the whole pattern is formed. It is preferable from the viewpoint of working efficiency to use a screen printing mask characterized in that the printing object surface side of the portion to be printed is cut deeper than the thickness of the portion of the screen hole for printing the group of line figures.

Further, in carrying out the printing method, a base, a transport belt disposed on the base,
A first mounting table and a second mounting table which are disposed at a predetermined distance below the conveyor belt and are respectively lifted and lowered at a predetermined timing by a lifting cylinder, and the first and second mounting tables are provided on the front surface of the base. The second mounting table includes a pair of holding members that are disposed before and after each of the printing materials in the conveyance direction of the printing material, and are moved up and down at a predetermined timing by an elevating cylinder, and hold the printing material conveyed by the conveyance belt from the front and rear directions. It is also preferable to use a printing-substrate mounting / fixing device for screen printing in terms of work efficiency.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show a mask (metal mask) suitable for use in the present invention.
Has a screen hole 2 for printing a group of line figures which are parallel to each other and has a small distance from each other on the left side of the center, and a screen hole 3 for printing the entire pattern on the right side of the center.

The printing screen holes 2 for the group of line figures are made thin by shaving the surface on which the cream solder, ink, etc. are placed, while the printing screen holes 3 for the whole pattern are formed. The printing material surface side of the portion where a group of line figures is printed is cut deeper than the thickness of the portion of the screen hole 2 for printing the group of line figures. In addition, 4 and 5 respectively show the cut-out portions.

In the screen printing method according to the present invention, a group of line figures are first printed on a printing object by using the mask 1 through the screen holes 2 for printing a group of line figures, and thereafter the entire pattern is printed. The whole pattern is printed by the screen holes 3 for use.

When a squeegee (not shown) slides on the mask 1, a portion of the screen hole 2 for printing a group of line figures is made thin by shaving the surface on which cream solder, ink, etc. are placed. Therefore, the amount of cream solder, ink, etc. extruded from the screen hole is small, so that they do not spread on the back side of the mask 1.

Further, when the whole pattern is printed next, the printing material hole side of the portion where the group of line figures is printed between the screen holes 3 for printing the whole pattern is the screen hole 2 for printing the group of line figures. Since it has been shaved deeper than the thickness of the portion, the already applied cream solder, ink and the like do not contact the mask 1.

Further, when printing using the mask 1, if two printing materials are set under the mask 1 and printing is performed at the same time, and after printing, the printing materials are sequentially moved to the right side, so that the work is facilitated. . What is suitable for carrying out this is the apparatus for mounting and fixing a printing material shown in FIGS.

In the figure, reference numeral 6 denotes a base. The base 6 is provided with a horizontally elongated hole 6a on the front surface.
Reference numerals 7 and 7 denote transport belts disposed on the upper portion of the base 6, and 8 and 8 denote pulleys thereof. Reference numeral 9 denotes a first mounting table disposed below the conveyor belt 7. 10 is the first
The cylinder is a cylinder for moving the mounting table 9 up and down at a predetermined timing, and is fixed vertically to the base 6. The upper end of the piston rod 10 a of the cylinder 10 is connected to the lower surface of the first mounting table 9.

Reference numerals 11 and 11 denote guide posts suspended from the lower surface of the first mounting table 9, and are slidably fitted into guide sleeves 12 and 12 provided on the base 6. 13a is a tray fixed to the lower surface of the first mounting table 9, and 13b is a tray fixed to the upper surface of a second mounting table described later.

Reference numeral 14 denotes a portion below the conveyor belt 7,
The second mounting table is disposed at a predetermined distance from the first mounting table 9. Reference numeral 15 denotes a cylinder for moving the second mounting table 14 up and down. 15a is a piston rod of the cylinder 15. Reference numerals 16 and 16 denote guide posts, and 17 and 17 denote guide sleeves.

Reference numerals 18 and 19 denote a pair of holding members disposed before and after the first mounting table 9 in the direction in which the printing material is conveyed. 20
Is a cylinder that raises and lowers the one holding member 18 at a predetermined timing, and 21 is a connecting rod. Reference numeral 22 denotes a cylinder for raising and lowering the other holding member 19 at a predetermined timing, and reference numeral 23 denotes a connecting rod. Reference numeral 24 denotes a cylinder which is horizontally fixed to the connecting rod 23 and moves the holding member 19 in a horizontal direction at a predetermined timing.

Reference numerals 25 and 26 denote fixing pins 25a and 26a.
And a pair of fixing members disposed between the pair of holding members 18 and 19, which are used when a hole is formed in an object to be printed such as a printed circuit board. The pair of fixing members 25 and 26 are connected to cylinders 29 and 30 via connecting rods 27 and 28, respectively. The cylinder 2
Numerals 9 and 30 are used to raise and lower the pair of fixing members 25 and 26 at a predetermined timing.

Reference numeral 31 denotes a support member for the cylinders 20 and 29. A projection 31a is provided at the rear portion so as to movably fit into the long hole 6a of the base 6. 32 is the cylinder 2
2, 30 support members, the rear of which has a long hole 6
A projection 32a is provided so as to be movably fitted to a. These support members 31, 32 can be moved in the horizontal direction according to the pitch of the pattern.

Reference numerals 33 and 34 denote a pair of holding members disposed before and after the second mounting table 14 in the conveying direction of the printing material. 3
Reference numeral 5 denotes a cylinder for raising and lowering the one holding member 33 at a predetermined timing, and reference numeral 36 denotes a connecting rod. Reference numeral 37 denotes a cylinder that raises and lowers the other holding member 34 at a predetermined timing, and 38 denotes a connecting rod. Also, 39
Is a cylinder fixed horizontally to the connecting rod 38 and moving the holding member 34 horizontally at a predetermined timing.

Reference numerals 40 and 41 denote a pair of fixing members having fixing pins 40a and 41a and disposed between the pair of holding members 33 and 34. Further, the pair of fixing members 40, 4
Reference numeral 1 denotes cylinders 44 and 45 via connecting rods 42 and 43, respectively.
Connected to.

Reference numeral 46 denotes a support member for the cylinders 35 and 44. A projection 46a is provided at the rear portion so as to movably fit into the long hole 6a of the base 6. 47 is the cylinder 3
7 and 45, and a long hole 6 of the base 6 at the rear.
A protrusion 47a is provided so as to be movably fitted to a.

The operation of the printing-substrate mounting / fixing device is as follows. The holding members 18 and 33 on the front side in the transport direction are raised by a signal from the supply side of the print substrate, and stop the print substrate (print substrate) transported by the transport belt 7. At this time, the operation of the transport belt 7 also stops. Next, the other holding members 19 and 34 are raised,
After it has been completely lifted, it is moved forward by the cylinders 24 and 39, respectively. As a result, the printing material is clamped between the pair of clamping members 18, 19, 33, 34.

Next, the first mounting table 9 and the second mounting table 14 are raised to support the printing material from below. Then, in this state, the mask and squeegee descend, and cream solder,
Printing is performed by the squeegee slidingly contacting the mask on which the ink or the like is placed.

At this time, using the mask 1, the screen holes 3 for printing the entire pattern are placed on the first mounting table 9, and the screen holes 2 for printing a group of line figures are placed on the second mounting table 14. If it is positioned and printed, it is possible to print on two printing materials simultaneously. Then, after the printing, if the printing medium is sequentially transferred to the mounting table on the front side in the transport direction,
The pattern shown in FIG. 6 can be automatically printed.

The operation after printing will be described.
First, each member is separated from the printing substrate by the reverse procedure. Next, the conveyance belt 7 starts operating again, and moves the printing medium forward. Then, the holding members 18, 33 on the front side in the transport direction are raised again at a predetermined timing, and thereafter, the printing material is fixed by the same procedure as described above.

[0029]

According to the printing method of the present invention, it is possible to print a whole pattern including a group of line figures which are parallel and have a narrow interval from each other, without bleeding on a printing material. Further, by using the mask and the printing material placing and fixing device according to the present invention, printing can be automatically and continuously performed, which is extremely effective in mass production.

[Brief description of the drawings]

FIG. 1 is a front view of a mask used in a screen printing method according to the present invention.

FIG. 2 is a back view of a mask used in the screen printing method according to the present invention.

FIG. 3 is a front view of a printing material placing and fixing device used in the screen printing method according to the present invention.

FIG. 4 is a side view of a printing-substrate mounting and fixing device used in the screen printing method according to the present invention.

FIG. 5 is a plan view of a printing-substrate mounting and fixing device used in the screen printing method according to the present invention.

FIG. 6 is a front view of a printing object in a state where an entire pattern including a group of line figures is printed.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Mask 2 Screen hole for printing a group of line figures 3 Screen hole for printing of whole pattern 4, 5 Shaved portion 6 Base 6a Slot 7, 7 Conveyor belt 9 First mounting table 10 Cylinder 14 Second mounting table 15 Cylinder 18, 19 A pair of holding members 20 Cylinder 22 Cylinder 24 Cylinder 25, 26 A pair of fixing members 29 Cylinder 30 Cylinder 31, 32 Cylinder supporting member 33, 34 A pair of holding members 35 Cylinder 37 Cylinder 39 Cylinder 40, 41 A pair of fixing Member 44 Cylinder 45 Cylinder 46, 47 Cylinder support member

────────────────────────────────────────────────── ─── Continued on the front page (51) Int.Cl. ⁷ identification symbol FI // H05K 3/12 H05K 3/12 (58) Fields investigated (Int.Cl. ⁷ , DB name) B41F 15/00-15 / 44 B41M 1/12 B41N 1/24

Claims (4)

(57) [Claims] 1. A screen printing method for printing a group of line figures which are parallel and have a small interval therebetween and a whole pattern including the same at a predetermined position on one sheet of printing material. Using a mask provided with holes and printing screen holes for the whole pattern separated, first, a group of line figures were printed with a smaller application amount of cream solder, ink, etc. than the whole pattern, and then applied to the substrate A screen printing method characterized by printing a whole pattern while preventing cream solder, ink or the like of a group of line figures from adhering to the back surface of a mask. 2. A printing screen hole for printing a group of line figures which are parallel and closely spaced from each other, and a printing screen hole for printing a whole pattern are provided at a required interval, and the screen screen for printing said group of line figures is provided. The portion of the hole is made thinner by shaving the surface side on which the cream solder, ink, etc. are placed, while the surface of the printing material surface of the portion for printing a group of line figures between the printing screen holes of the entire pattern is A screen printing mask characterized in that the mask is cut deeper than the thickness of a portion of a screen hole for printing a group of line figures. 3. A group of line figures which are parallel and have a narrow distance from each other.
Screen holes for printing, and a screen
Holes with a mask provided at the required interval.
Printing substrate placement used in screen printing method for printing
A fixing device, comprising: a base, a conveyor belt disposed above the base, and a predetermined distance below the conveyor belt, each of which is lifted and lowered at a predetermined timing with a lifting cylinder. The first mounting table and the second mounting table to be moved, and the front and rear sides of the base and the first and second mounting tables are disposed before and after in the transport direction of the printing material. An apparatus for mounting and fixing a printing material for screen printing, comprising a pair of holding members that lifts and lowers the printing material conveyed by a conveyance belt from the front and rear directions. 4. A pair of fixing members, which move up and down at a predetermined timing with a lifting cylinder and insert a fixing pin into a perforated portion of a printing medium, are disposed on the front surface of the base between the pair of holding members. 4. The apparatus for mounting and fixing a printing medium for screen printing according to claim 3.