JP2990242B2 - Cream solder printing system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention uses a screen plate having a printed pattern opening on a printed wiring board before mounting circuit elements such as chip-shaped electronic components on the board. And a cream solder application device for screen printing cream solder.

[0002]

2. Description of the Related Art As a conventionally known cream solder applying apparatus or printing apparatus, a spatula-shaped sliding plate as a squeegee for screen printing is reciprocally slid on the screen plate to thereby prepare a screen plate in advance. The one in which cream solder is printed on a printed wiring board arranged on the lower surface side of the screen plate through the print pattern opening of the screen plate while stretching a relatively large amount of cream solder piled on the top, for example, , Tokuho 1-1
No. 9375, for example.

[0003]

In the above-mentioned conventional cream solder application apparatus, the mass of cream solder is previously piled on the screen plate as described above. Of course, there is an inconvenience that the printing is inevitably exposed to the atmosphere even during printing, and the volatile components are solidified due to volatilization and oxidation thereof, so that the printing result is likely to be adversely affected.

In addition, since cream solder is printed by reciprocating motion of the spatula-shaped sliding plate, the finished state of printing is not uniform in every operation, and sometimes more cream solder is printed than necessary. This causes a so-called bleeding phenomenon in which cream solder is printed on unnecessary portions on the wiring board.

[0005] Further, in this type of conventionally known solder paste, the solder paste in the solder paste before printing is regularly or periodically applied to the solder paste before printing in order to maintain the uniformity of the kneading state of the solder particles and the flux in the solder paste. However, the progress of solidification or oxidation with the passage of time during that time was unavoidable, and as a result, the printing results had to be unstable and non-uniform. .

On the other hand, if oxidation, solidification, etc. of the cream solder is observed in the artificial kneading operation as described above, even if a considerable amount of cream solder remains at that time,
In order to prevent the subsequent printing from being deteriorated by using it, the remaining cream solder must be removed from the screen plate, new cream solder must be supplied, and printing work must be resumed. Was discarded as industrial waste, which was economically disadvantageous.

Further, during the above-described artificial kneading operation or the supply and disposal of the cream solder, the printing operation of the cream solder must be temporarily stopped, and the stop time follows the printing operation. An unbalanced work waiting time is generated in each process, and as a result, this is a source of time loss that affects the entire assembly work of the printed circuit board.

The present invention has been made to solve the above-mentioned disadvantages or disadvantages of the prior art.
The cream solder used for printing is stored in the apparatus main body in a state where the contact with the outside air is cut off, and an appropriate amount of the cream solder is supplied to the screen plate at each printing, so that the screen printing on the printed circuit board can be performed. Accordingly, it is a main object of the present invention to provide a cream solder applying apparatus capable of realizing a drastic improvement in efficiency of screen printing operation and printing accuracy and uniformization of printing quality. .

[0009]

Means for Solving the Problems In order to achieve the above object, a cream solder applying apparatus for applying cream solder to a printed circuit board through a screen plate having a plurality of openings having a required print pattern is provided. A pair of front and rear sliding plates that are brought into contact with the surface of the screen plate at the bottom, and a horizontally elongated supply formed between the pair of sliding plates and opened and closed by one of the sliding plates. A housing having a mouth, and a chamber capable of storing cream solder discharged and supplied onto the screen plate through the supply port in a state in which contact with the outside air is blocked; and the one sliding plate. Operatively connected, the supply port is normally closed, and the cream solder stored in the chamber is supplied onto the screen plate at each coating operation. It is opened so as to, and instrumentation comprising a supply port closing mechanism operable to maintain the open state
A main body and a drive mechanism for moving the main body along the upper surface of the screen plate, and the pair of front and rear sliding plates are slightly lower than the bottom surface of the housing.
Each time the coating process is performed,
The screen with the load on the device
Has a horizontal sliding surface that can be slid horizontally on the plate
A pair of left and right sliding pieces are projected downward from the pair of front and rear sliding plates.
In the form of being almost in contact with the left and right sides of the
Oppositely installed on both left and right sides of the housing bottom,
Slides horizontally on the screen plate together with the sliding piece of
Of the pair of front and rear sliding plates to be moved, the squeegee
And the cream solder supplied from the supply port by the contact load of the rear sliding plate is forcibly fed into the opening of the screen plate.

[0010] Further , the cream solder applying apparatus of the present invention.
Has the required printed pattern on the printed circuit board.
Through a screen plate with multiple openings
A solder paste application device for applying solder
A pair of front and rear slides that are brought into contact with the upper surface of the screen plate
A moving plate, formed between the pair of sliding plates, and
Horizontal supply that can be opened and closed by one sliding plate
And the inside through the supply port.
The cream solder discharged and supplied onto the clean plate
C equipped with a chamber that can be stored in a state where contact is interrupted
A housing, operatively connected to the one sliding plate,
Keep the supply port closed under normal conditions and apply each time
Cream stored in the chamber during the working process
Opening to supply solder on the screen plate; and
Supply port opening / closing mechanism that operates to maintain the open state
And a screen version of the device body
And a drive mechanism to move it along the top surface.
The cream contained in the chamber of the housing
Float a float on the surface of the solder and check the position change
The remaining amount of the cream solder is detected by the sensor.
With a sensor mechanism configured to detect
The chamber in response to a signal from the sensor mechanism.
Was designed to automatically supply cream solder to
The combination of the cream solder replenishing device
It is a feature .

[0011] Other than the cream solder application device according to the present invention
Regarding the structural features of the above, each item of claims 3 to 6 is described.
Please refer to .

[0012]

In the apparatus according to the first aspect, the main body of the apparatus is a screen.
When the solder is moved along the upper surface of the screen plate , the cream solder in the chamber is supplied to the upper surface of the screen plate through the horizontally-long supply port , and the cream solder is moved along with the movement of the apparatus body.
The screen plate in a state where the load of the device body is shared equally
Integrated with the pair of left and right sliding pieces that slide horizontally on top
Uniformly it is forced into the print pattern openings of the screen plate by the rear sliding plate to slide, is caused to print on a substrate disposed on the lower surface side of the screen plate through the pattern openings. The operation of the device according to the other claims will be described later in connection with the embodiments.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the accompanying drawings showing an embodiment thereof.

In the cream solder application apparatus according to the present invention, a top surface of a screen plate S having a housing A forming a main body of the device and a plurality of printed pattern openings S 'arranged on a printed circuit board P is provided. The housing A has creamy solder, that is, a solder alloy powder and a liquid flux having a relatively high viscosity mixed therein. A chamber A1 capable of storing the above-mentioned one in a state where the contact with the outside air is cut off,
A pair of front and rear sliding plates 1 and 2 that are brought into contact with the upper surface of the screen plate S at the bottom, and are formed between the pair of sliding plates 1 and 2 and are opened and closed by one of the sliding plates. And a horizontally-long supply port A2 for discharging and supplying the cream solder 3 accommodated in the chamber A1 to the upper surface of the screen plate S.

In the illustrated example, as shown in FIGS. 1 and 2, the housing A has a block-shaped front wall 4 having a projecting portion 4 'projecting obliquely downward and rearward. A block-shaped rear wall 5 having a narrow vertical width, side walls 6 respectively fixed to both end surfaces of the front wall and the rear wall, an upper lid 7 attached to the top of the front wall 4, the rear wall 5 and the side wall 6, An inner lid 8 attached to the inside of the upper lid, a bottom wall 9 fixed to the side wall 6, and a slidable front-rear direction between a guide surface 9 'of the bottom wall 9 and a lower surface 5' of the rear wall 5. Is formed by the slider 10 inserted into the slider 10. Of the pair of front and rear sliding plates 1 and 2, the front sliding plate 1 is fixed to the rear surface of the overhang portion 4 'of the front wall 4, and the rear sliding plate 2 is fixed to the front surface of the slider 10. The supply port A2 is opened and closed by the rear sliding plate 2 as the slider 10 slides in the front-rear direction. The supply port A2, which can be opened and closed, is opened and closed by the operation of a supply port opening / closing mechanism B described below.

The supply port opening / closing mechanism B for opening / closing the supply port A2 is rotatably mounted on the side wall 6 of the housing A in the illustrated example, and is rotated about a horizontal axis by a driving device (not shown). The rotating arm 11 includes a rotating shaft 11 that is driven to rotate, and an operating arm 12 whose upper end is fixed to the rotating shaft and whose lower end is operatively connected to the rear portion of the slider 10. The movement of the slider 10
Moves forward and retreats, and accordingly, the rear sliding plate 2 moves forward and backward, contacts the front sliding plate 1 in the case of forward movement, closes the supply port A2, and in the case of backward movement, The supply port A2 is opened apart from the moving plate 1. And the supply port opening / closing mechanism B
In the normal state, that is, the supply port A2 is closed at the time of non-coating operation, is opened at each coating operation, and operates so as to maintain the open state. Also, the pair of front and rear sliding plates 1 described above,
2 slides on the screen plate S only when the housing A is moved forward to apply the cream solder 3, and the rear sliding plate 2
Is designed to function as a squeegee for forcibly feeding the cream solder 3 discharged and supplied from the supply port A2 into the opening S1 of the screen plate. As shown in FIGS. 1 and 2, the pair of front and rear sliding plates 1 and 2 respectively project slightly below the bottom surface of the housing A. other
On the other hand, in FIGS.
In the state where the load of the device main body is equally shared
Horizontal sliding that can be slid horizontally on the screen plate S
A pair of left and right sliding pieces having a surface 15A.
Is formed into a kind of sled when viewed from the side. this
A pair of left and right sliding pieces are a pair of sliding plates 1 and 2 described above.
On the left and right end faces of the lower projecting portions 1A and 2A, respectively.
The housing S on the left and right sides of the bottom of the housing S
They are installed facing each other. Therefore, the main body of the device
The pair of left and right sliding pieces 15, 15 are equally shared.
In a horizontal state on the screen S, that is, a constant horizontal
It can be moved while maintaining the degree of
The pair of sliding plates 1 and 2 also slide on the screen plate S horizontally.
Therefore, the rear sliding plate 2 as a squeegee
As a result of sliding with a uniform contact load against plate S, supply
The cream solder 3 supplied from the mouth A2 is
Printing can be performed evenly in the opening S1.
It is possible to Rukoto to obtain a good printing results with no irregularities. Ma
In addition, the pair of front and rear sliding plates are substantially parallel and oblique to each other.
It is disposed so as to be inclined rearward, and the supply port A2 is opened.
Supply the cream solder 3 in the chamber A1 at the time of opening
You can feed straight to the mouth diagonally backward
It is being done.

In the chamber A1 of the housing A, a rotary roller 13 for kneading the cream solder 3 stored in the chamber and feeding the kneaded solder 3 onto the screen plate S from the supply port A2 is provided. The roller 13 is driven to rotate by a rotation driving mechanism (not shown) attached to the housing A. A pipe 14 for circulating hot water as heating means for keeping the cream solder 3 contained in the chamber A1 at an optimum temperature is provided inside the rotating roller 13 in an axial direction.

The apparatus main body is suspended on a guide rail (not shown) so as to be horizontally movable and vertically movable, and is separated upward from the screen plate S at rest or during non-coating as shown in FIG. When the application operation is started, it is lowered from the standby position to the position shown in FIG. 4, that is, the horizontal movement start position for the application operation. When the apparatus main body is lowered from the standby position and set at the movement start position, the rotating roller 13 starts rotating clockwise in FIG. 1 and the supply port A2 which has been closed until then is moved to the supply port opening / closing mechanism B. Is released as shown in FIG. Next, the apparatus main body is moved to the arrow X in FIG.
, Ie, in the printing direction, the cream solder 3 stored in the chamber A1 inside the apparatus main body is supplied from the opened supply port A2 to the upper surface of the screen S, and the upper surface of the screen plate is removed. Screen printing is performed on the substrate P of the cream solder by a sliding plate 2 as a sliding squeegee. And the main body of the device is
As shown in FIG. 6, the screen A is advanced while performing screen printing, and when approaching the position shown in FIG. 6 which is the end point, the supply port A2 which has been opened until then is closed by the supply port opening / closing mechanism B, and the screen plate S The supply of the cream solder 3 to the upper surface is stopped, and the rotation of the rotating roller 13 is stopped. Next, the apparatus main body is raised from the end point position with the supply port A2 closed, and returned to the standby position for the next printing operation.

The slider 10 has a protrusion 10A at the front end thereof, and the protrusion slides on the outer peripheral surface of the rotary roller 13 when the supply port A2 is open as shown in FIG. Accordingly, a guide path A3 for guiding the cream solder 3 in the chamber A1 to the supply port A2 is provided between the roller outer peripheral surface and the rear sliding plate 2 together with the front sliding plate 1. When the supply port A2 is closed, the state of sliding contact with the outer peripheral surface of the roller is released. The rotating roller 13 is adapted to be rotated at a predetermined speed during the coating operation, and the cream solder 3 in the chamber A1 is well kneaded by the action pressure due to the rotation, while maintaining a viscosity suitable for screen printing. In addition to supplying the cream solder 3 to the upper surface of the screen plate S, the supply from the opened supply port A2 is promoted, so that an appropriate amount of the cream solder 3 can be stably supplied at each coating operation. It has become.

In the present invention, the housing A
Flow on the surface of cream solder 3 stored in member A1
(Not shown), and change the position
The remaining amount of the cream solder
A sensor mechanism configured to detect (not shown)
) And responds to signals from the sensor mechanism.
To automatically supply cream solder to the chamber.
Combined with a cream solder replenishing device configured to
It is desirable to have a configuration. This way, Cree
Automatic solder replenishment without manual intervention
As a result, continuous operation of the machine is possible and printing efficiency is reduced.
Can be raised step by step . In the present invention,
Ream solder 3 was stored in a state where contact with outside air was cut off
An inert gas such as nitrogen gas is sealed in the chamber A1.
It is preferable to adopt a configuration in which a combination of the above devices is combined . This
The solidification or acidification of the cream solder before printing
It is possible to further enhance the effect of preventing the formation phenomenon . Ma
The cream solder printing apparatus according to claim 4 and claim 5.
, The rear sliding plate 2 for opening and closing the supply port A2 is
The slider 10 is fixed to the front end of the slider 10 which is reciprocated in the rear direction.
It is possible to open and close the supply port smoothly.
It becomes possible. Still further, according to the invention of claim 6,
In the case of a solder coating device, a pair of front and rear sliding plates 1 and 2
They are arranged almost parallel to each other and at an angle
When the supply port A2 is opened, the cream solder 3 of the chamber A1 is removed.
So that it can be fed linearly obliquely rearward toward the supply port.
Flow resistance of the cream solder is reduced.
In addition, the smooth discharge supply becomes possible .

An embodiment of the present invention will now be described with reference to the drawings.
However , the present invention is not limited to the embodiment.
Without departing from the spirit of the invention as set forth in the appended claims.
To the extent possible, with various modifications.
It can be. Next, I will describe the modified examples.
You . For example, in order to know the cream solder remaining in the apparatus main body, Rukoto using a transparent material on the side wall to the front wall or the like, the temperature of the location where the printing operation, the printed circuit to be working conditions and printed such humidity A mechanism that adjusts the degree of opening of the supply port, the temperature of hot water circulating inside the rotating roller, the rotation speed of the rotating roller, etc. to determine the optimal amount, temperature, and kneading state of the cream solder according to the type of substrate, etc. To add a mechanism to change the rotation speed of the rotating roller for each work process in one printing operation, always knead the cream solder before printing, and set a path for circulating hot water in front. Either the wall, the rear wall, or a combination thereof including the inside of the rotating roller, and instead of circulating hot water, providing a heating mechanism such as a heater can be cited.

[0022]

EFFECTS OF THE INVENTION Since the cream solder applying apparatus according to the present invention is configured as described above, it is possible to solve the above-mentioned disadvantages or disadvantages of the prior art and to use cream for printing. The solder is stored in the main body of the apparatus in a state where the contact with the outside air is cut off, and an appropriate amount of the solder is supplied to a screen plate at each printing, so that screen printing can be performed on a printed circuit board .
In addition to being able to dramatically improve the efficiency of screen printing work and printing accuracy, and achieve uniform printing quality, etc.
As described above, many remarkable effects can be obtained.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional side view of a main part showing a state in which a supply port of an embodiment of a cream solder applying apparatus according to the present invention is closed.

FIG. 2 is a vertical sectional side view showing a main part of the embodiment of FIG. 1 in which a supply port is open.

FIG. 3 is a schematic side view showing the operation sequence of the device.

FIG. 4 Same as above.

FIG. 5 Same as above.

FIG. 6 Same as above.

[Explanation of symbols]

S screen version. S1 Print pattern opening. P Printed circuit board. A Housing. A1 chamber. A2 Supply port. B Supply port opening / closing mechanism. 1 Front sliding plate. 2 Rear sliding plate (squeegee). 3 Cream solder. 10 Slider. 13 rotating roller. 15 left and right pair of sliding pieces .

Continuation of front page (56) References JP-A-5-57870 (JP, A) JP-A-5-200976 (JP, A) JP-A-4-284249 (JP, A) JP-A-1-205592 (JP) , A) JP-A-4-242993 (JP, A) JP-A-63-202088 (JP, A) JP-A-62-81092 (JP, A) Fully open Showa 57-83842 (JP, U) Really open show 62-173929 (JP, U) Hikaru 2-115439 (JP, U) (58) Fields surveyed (Int. Cl. ⁶ , DB name) B41F 15/40-15/46 B41F 15/08 303 H05K 3 / 12 610 H05K 3/34 505

Claims (6)

(57) [Claims] 1. A cream solder applying apparatus for applying cream solder to a printed circuit board through a screen plate having a plurality of openings having a required print pattern, the bottom being in contact with the upper surface of the screen plate. A pair of front and rear sliding plates, a horizontally long supply port formed between the pair of sliding plates, and opened and closed by one of the sliding plates. A housing provided with a chamber capable of accommodating cream solder discharged and supplied onto the screen plate through an opening in a state where the solder is kept out of contact with the outside air; and a housing operatively connected to the one sliding plate, wherein the supply opening is provided. Closed under normal conditions,
An apparatus main body including a supply port opening / closing mechanism that opens to supply the cream solder stored in the chamber onto the screen plate at each application operation, and operates to maintain the open state ; and the apparatus main body. And a drive mechanism for moving the pair of front and rear sliding plates from the bottom surface of the housing.
Each time the application work
In the process, the load of the device body is shared equally
A horizontal slide on the screen plate
A pair of left and right sliding pieces having a sliding surface are
The left and right sides of the downward projecting part of the plate are almost in contact with each other.
In opposite directions on the left and right sides of the housing bottom
The screen is integrally formed with the pair of left and right sliding pieces.
Of the pair of front and rear sliding plates that are slid horizontally on the plate, cream solder supplied from the supply port is forcibly fed to the opening of the screen plate by the contact load of the rear sliding plate as a squeegee. A cream solder application device, characterized in that it is configured to be put in . 2. A cream solder applying apparatus for applying cream solder to a printed circuit board through a screen plate having a plurality of openings having a required print pattern, wherein a bottom portion of the cream solder applying device is in contact with a surface of the screen plate. A pair of front and rear sliding plates, a horizontally long supply port formed between the pair of sliding plates, and opened and closed by one of the sliding plates. A housing having a chamber capable of accommodating cream solder discharged and supplied onto the screen plate through a port in a state in which contact with outside air is cut off, and operatively connected to the one sliding plate, and the supply port is in a normal state. Is closed, and the cream solder stored in the chamber is opened to be supplied onto the screen plate at each coating operation, and the opened state is maintained. Supply opening and closing mechanism
And a drive mechanism for moving the device body along the upper surface of the screen plate, and the cream contained in the chamber of the housing.
Float a float on the surface of the solder and check the position change
The remaining amount of the cream solder is detected by the sensor.
With a sensor mechanism configured to detect
The chamber in response to a signal from the sensor mechanism.
Was designed to automatically supply cream solder to
A cream solder application device characterized by having a configuration in which a cream solder supply device is combined . 3. A cream solder applying apparatus for applying cream solder to a printed circuit board via a screen plate having a plurality of openings having a required print pattern, wherein a bottom portion is in contact with an upper surface of the screen plate. A pair of front and rear sliding plates, a pair of sliding plates, and a horizontally-long supply port formed between the pair of sliding plates and opened and closed by one of the sliding plates. A housing provided with a chamber capable of accommodating cream solder discharged and supplied onto the screen plate through an opening in a state where the solder is kept out of contact with the outside air; and a housing operatively connected to the one sliding plate, wherein the supply opening is provided. Closed under normal conditions,
An apparatus main body including a supply port opening / closing mechanism that opens to supply the cream solder stored in the chamber onto the screen plate in each coating operation step, and operates to maintain the open state; It consists of a drive mechanism for moving the main body along the upper surface of the screen plate, and cuts off the contact between the cream solder and the outside air.
An inert gas such as nitrogen gas is placed in the chamber
A cream solder application device, characterized in that it has a configuration in which a device for enclosing solder is combined . 4. A cream solder applying apparatus for applying cream solder to a printed circuit board via a screen plate having a plurality of openings having a required print pattern, wherein a bottom portion is in contact with an upper surface of the screen plate. A pair of front and rear sliding plates to be urged, and a horizontally long supply port formed between the pair of sliding plates and opened and closed by a rear sliding plate among them. A housing having a chamber capable of accommodating cream solder discharged and supplied onto the screen plate through a port in a state of blocking contact with the outside air, and a housing operatively connected to the rear sliding plate, wherein the supply port is provided. Closed under normal conditions,
An apparatus main body including a supply port opening / closing mechanism that opens to supply the cream solder stored in the chamber onto the screen plate in each coating operation step, and operates to maintain the open state; A drive mechanism for moving the main body along the upper surface of the screen plate, wherein the housing has a front wall, a rear wall, and side walls fixed to both end surfaces of the front wall and the rear wall, respectively. A top lid attached to the top of the wall, a bottom wall fixed to the side walls, and a slidably fitted front and rear direction between the bottom wall and the rear wall. And a slider that is reciprocated in the direction, wherein the rear slide plate is fixed to a front end of the slider. 5. The cream solder application device according to claim 4, wherein the supply port opening / closing mechanism is rotatably attached to both side walls of the housing, and is rotated around a horizontal axis by a driving device. A driving shaft, an upper end portion of which is fixed to the rotating shaft, and a lower end portion of which includes an operating arm operatively connected to a rear portion of the slider. The swing of the operating arm causes the slider to move forward and backward, Along with this, a rear solder plate is moved forward and backward to open and close the supply port, and the cream solder application device is characterized in that it is provided. 6. A pair of front and rear sliding plates are disposed substantially parallel to each other and obliquely inclined rearward, and when the supply port is opened, cream solder in the chamber is inclined obliquely rearward toward the supply port. The cream solder application device according to any one of claims 1 to 6, wherein the device can be fed linearly.