JP3387761B2 - Ink removal device for printed circuit boards - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for removing ink from a printed circuit board, and more particularly, to a side surface of the printed circuit board when the ink applied to the surface of the printed circuit board is removed in a step of filling a through hole. The present invention relates to an ink removing device for a printed circuit board that can remove the ink that has overflowed.

[0002]

2. Description of the Related Art In a through-hole printed circuit board in which a double-sided pattern of an insulating base material is conducted by forming plating in the through-hole, the plating in the through-hole is temporarily protected against an etching solution. To
Filling holes with ink is performed.

Usually, this ink hole filling is performed by a roll coating method or the like, but it is necessary to remove excess ink that does not contribute to hole filling from the surface of the printed circuit board. Therefore, conventionally, as illustrated in FIG. 4, a pair of upper and lower rubber squeegees 1 and 1 are provided so as to be substantially orthogonal to the transport direction A of the printed circuit board P, and the printed circuit board P coated with the ink is provided in the upper and lower rubber squeegees 1. The excess ink is removed from the surface of the printed circuit board P by passing the space.

[0004]

According to this, although excess ink is removed from the surface of the printed circuit board P,
A part of it protrudes to the side surface of the printed circuit board P as indicated by R in the figure. If this is left as it is, it is solidified in an indefinite shape in, for example, a drying process, and adversely affects positioning and polishing of the substrate in each of the subsequent processes.

For this reason, conventionally, after the ink R protruding to the side surface of the substrate is heated and hardened, it is either scraped off manually or the side surface of the substrate is covered with a masking tape before the ink hole is filled, and the masking tape is removed after the ink hole is filled. I try to peel it off.

However, according to the former scraping,
Not only does this require a considerable amount of labor, but there is also the problem that the shavings redeposit on the substrate. Further, even if this shaving is carried out by a processing machine, the squeezing-out ink must be removed to the extent that the substrate itself is also removed, so that the size of the product is reduced.

In the case of the latter masking tape,
There is no shavings or product size reduction, but it takes longer to adjust the tape correctly and another problem is that used tape is generated as waste. Become.

The present invention has been made in order to solve such a problem, and its purpose is to mechanically remove excess ink protruding from the side surface of a printed circuit board in a step of filling an ink hole in a through hole. An object of the present invention is to provide an ink removing device for a printed circuit board that can be surely removed.

[0009]

In order to achieve the above object, the present invention provides a printed circuit board for removing ink protruding from a surface of the printed circuit board to a side surface of the printed circuit board in a step of filling a through hole with ink. An ink removing device, wherein an ink scraping member arranged so as to abut a side surface of the printed circuit board conveyed by a predetermined conveying means, and the ink scraping member with respect to a conveying direction of the printed circuit board. A motor that rotates in the opposite direction,
And a squeegee member that comes into contact with the peripheral surface of the ink scraping member.

According to this structure, the ink scraping member that rotates in the reverse direction with respect to the conveying direction of the printed circuit board collects the ink from the side surface of the substrate, and the ink attached to the ink scraping member is scraped off by the squeegee member. Be done. Therefore, the ink does not redeposit on the side surface of the substrate. In this case, a roller is used as the ink scraping member, but a caterpillar or a chain may be used.

In this case, the ink scraping member may be provided at a fixed position, but it is preferable that the ink scraping member further comprises a reciprocating driving means for contacting and separating from the side surface of the printed circuit board. It is possible to deal with printed circuit boards having different width dimensions.

At least the surface of the ink scraping member is preferably made of an elastic material such as rubber in order to make good contact with the side surface of the substrate, and a sponge-like porous material is used to increase the amount of ink collected (adhered). An elastic body is particularly preferable. Further, in order to prevent abrasion of the ink scraping member, the ink scraping member may be a hard member such as metal, wood or synthetic resin, and preferably metal, especially metal whose surface is plated or fluorinated. It is suitable for preventing this.

The ink scraping member may be oriented such that its axis is orthogonal to the printed board, but preferably the upper part of the axis is inclined obliquely toward the upstream side in the conveying direction of the printed board. well when being, according to this, even when the amount of ink protrudes on the substrate side is large, without pushing back the ink to the substrate surface, it can be removed reliably. The present invention can also be applied to the removal of the resist ink protruding from the edge of the substrate during screen printing.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, in order to better understand the technical idea of the present invention, preferred embodiments thereof shown in the drawings will be described.

FIG. 1 is a schematic perspective view of an embodiment according to the present invention, and FIG. 2 is a front view of the same embodiment as seen from a downstream side in a transport direction A of a printed circuit board P. As shown in FIG. 1, this embodiment is provided with a pair of upper and lower rubber squeegees 1, 1 which are arranged so as to be substantially orthogonal to the conveyance direction A of the printed circuit board P as in the conventional case.

For the convenience of drawing, the rubber squeegees 1 and 1 are not shown in FIG. In addition, the printed circuit board P
After filling the ink holes in the through holes, place the rubber squeegee 1 in a horizontal state by a conveying means such as a roller conveyor.
Although it is passed between the two, the transport means is also omitted in the drawing.

According to this embodiment, the rubber squeegee 1, 1
A pair of left and right ink scraping rollers 2, 2 arranged as ink scraping members on the downstream side of the printed circuit board P in the transport direction A, and motors 3, 3 for rotationally driving the ink scraping rollers 2, 2. Is equipped with. That is, the ink scraping rollers 2 and 2 are driven by the drive shaft 3 of the motors 3 and 3.
a, 3a is coaxially attached, and its axis X-
The printed circuit board P is arranged so as to come into contact with the side surface of the printed circuit board P at both sides of the transport path with the X being vertical.

In this case, each ink scraping roller 2, 2
The rotation direction of is opposite to the transport direction A of the printed circuit board P. In FIG. 1, since the printed circuit board P is conveyed in the left direction A, one ink scraping roller 2 located on the front side in the drawing rotates clockwise, whereas the other ink scraping roller 2 is counterclockwise. Directional rotation.

Squeegee members 4 and 4 which are in contact with the peripheral surfaces of the ink scraping rollers 2 and 2 are provided. In addition, the squeegee members 4 and 4 are provided with an ink scraping roller 2 and an ink scraping roller 2 through an appropriate supporting arm (not shown).
It is held so as to be in contact with the peripheral surface of No. 2.

Each of the ink scraping rollers 2 may have a simple cylindrical shape, a drum shape as shown in FIG. 2, or a V-shaped groove shape, but at least the surface thereof is made of an elastic material such as rubber. In particular, a sponge-like porous elastic body is preferable. The ink scraping roller 2 may be a metal roller, but in that case, it is preferable that the surface thereof be plated or treated with fluorine. That is, an elastic body is excellent in ink removal performance,
In the case of metal, it is excellent in wear prevention.

On the other hand, each squeegee member 4 has a shape (male-female relationship) that matches the peripheral shape of the ink scraping roller 2, but the ink scraping roller 2 is made of an elastic material such as rubber or sponge. In some cases, the scraping surface of the squeegee member 4 may be slanted, and the scraping surface may be abutted more strongly below the ink scraping roller 2 than above.

Further, the squeegee member 4 itself may be tilted at a predetermined angle (preferably within a range of 40 degrees) with respect to the axis line XX of the ink scraping roller 2. That is, by tilting the upper side of the squeegee member 4 to the upstream side in the transport direction A of the printed circuit board P, it is possible to easily collect the scraped ink.

Further, with the squeegee member 4 parallel to the axis XX of the ink scraping roller 2 or with its upper side tilted as described above, the side opposite to the scraping surface of the squeegee member 4 is shown. May be inclined to the upstream side in the transport direction A of the printed circuit board P.

In any case, the inclination angle is within the range of 40 degrees. If the inclination angle exceeds 40 degrees, the contact force with respect to the ink scraping roller 2 is weakened and the squeegee member 4 itself becomes large, which is not preferable. Although one squeegee member 4 is assigned to each ink scraping roller 2 in this embodiment, a plurality of squeegee members 4 may be provided depending on the case.

In this embodiment, each motor 3 of the ink scraping roller 2 has an air cylinder (reciprocating driving means) 5.
It is mounted on a moving table 6 connected to the. The moving table 6 is moved in a direction orthogonal to the conveyance direction A of the printed circuit board P, so that each ink scraping roller 2 can come into contact with and separate from the side surface of the printed circuit board P. A solenoid may be used instead of the air cylinder 5.

Next, the operation of this embodiment will be described. First, in the standby state, each ink scraping roller 2
Is pulled back by the air cylinder 5 to a position away from the conveyance path of the printed circuit board P.

Printed circuit board P coated with hole-filling ink
When the rubber squeegees 1 and 1 are passed between the rubber squeegees 1 by unillustrated conveying means and ink arrives from the surface thereof, the ink scraping rollers 2 are rotated by the motor 3 in the direction opposite to the conveying direction A, and the air cylinders are rotated. It is moved (advanced) to the operating position where it comes into contact with the side surface of the printed circuit board P by 5.

As a result, the printed circuit board P passes through between the ink scraping rollers 2 while both side surfaces thereof are in contact with each other, but when the rubber squeegees 1 and 1 pass, the printed circuit board P has an extra portion protruding from the side surface thereof. The different ink R is scraped by the reverse rotation of each ink scraping roller 2.

The ink adhered to each ink scraping roller 2 by this scraping is written off from the peripheral surface by the squeegee member 4 which is in contact with the roller 2. Therefore, the ink scraped by the ink scraping roller 2 does not adhere to the printed circuit board P again. When the printed circuit board P passes between the ink scraping rollers 2, the air cylinder 5 operates and each ink scraping roller 2 is pulled back to the original standby position.

As shown in FIG. 3, the ink scraping roller 2 may be tilted with respect to the printed circuit board P. That is, by tilting the upper part of the axis line XX of the ink scraping roller 2 to the upstream side in the transport direction A of the printed circuit board P, even if the amount of the ink R protruding to the side surface of the substrate P is large, the ink R Can be reliably removed without pushing back to the front surface side of the substrate P.

Although the ink scraping roller 2 is reciprocally moved by the air cylinder 5 as the reciprocating driving means in the above embodiment, it may be fixedly arranged at a position in contact with the side surface of the printed circuit board P. Good. Further, the squeegee member 4 may be a squeegee roller which rotates in the reverse direction or in the normal direction with respect to the ink scraping roller 2.

The present invention can be applied not only to the removal of the hole-filling ink in the above-mentioned embodiment, but also to the removal of the resist ink protruding from the edge of the printed circuit board to the side surface at the time of screen printing. It is not necessary to use the rubber squeegee 1 together as in the embodiment.

[0033]

As described above, according to the present invention,
It is possible to automatically and cleanly remove excess ink protruding from the edge of the printed circuit board to the side surface thereof in the ink hole filling step of the through hole or the screen printing step.

[Brief description of drawings]

FIG. 1 is a schematic perspective view of an embodiment according to the present invention.

FIG. 2 is a front view of the same embodiment as seen from the downstream side in the printed board carrying direction.

FIG. 3 is a schematic diagram showing a state in which the ink scraping roller of the embodiment is arranged so as to be inclined with respect to a printed circuit board.

FIG. 4 is a perspective view showing a conventional example.

[Explanation of symbols]

P printed circuit board R extra ink 1 rubber squeegee 2 Ink scraping roller 3 motor 4 Squeegee member 5 Air cylinder 6 mobile platform

─────────────────────────────────────────────────── ─── Continuation of front page (56) References JP-A-8-2804 (JP, A) JP-A-8-336951 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) H05K 3/00-3/46

Claims (5)

(57) [Claims] 1. An ink removing device for a printed circuit board, which removes ink protruding from a surface of the printed circuit board to a side surface of the printed circuit board in a step of filling an ink hole in a through hole, the device being carried by a predetermined carrying means. An ink scraping member arranged so as to come into contact with the side surface of the printed circuit board, and a motor that rotationally drives the ink scraping member in a direction opposite to the transport direction of the printed circuit board.
An ink removing device for a printed circuit board, comprising: a squeegee member that comes into contact with a peripheral surface of the ink scraping member. 2. The ink removing device for a printed circuit board according to claim 1, further comprising a reciprocating drive means for bringing the ink scraping member into contact with and away from the side surface of the printed circuit board. 3. The ink removing device for a printed circuit board according to claim 1, wherein at least the surface of the ink scraping member is made of an elastic material such as rubber. 4. The ink removing device for a printed circuit board according to claim 1, wherein at least the surface of the ink scraping member is made of metal. 5. The ink scraping member is characterized in that an upper part of an axis thereof is inclined in an oblique direction toward an upstream side in a conveying direction of the printed circuit board.
The ink removing device for a printed circuit board according to any one of 1.