JPH0156866B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a printed circuit board gripping mechanism, which is used to grip a printed circuit board in order to solder it in a solder tank after inserting an electronic component into the printed circuit board. This invention relates to an improvement of a gripping tool holding mechanism.

[Prior art] In a conventional printed circuit board soldering device,
As a method of gripping a printed circuit board with a printed circuit board gripping tool, it is common to grip the printed circuit board in the longitudinal direction, and rarely in the lateral direction. Then, the printed circuit board is gripped using one of these methods, and the printed circuit board is soldered in a solder tank.

[Problems to be Solved by the Invention] When soldering printed circuit boards using the method described above, the insertion pitch for electronic components inserted into printed circuit boards has recently become narrower and narrower. There were cases where the IC lead wires were shot out. In other words, a problem arises in that molten solder adheres across the lead wires of the IC.

On the other hand, when workers perform soldering work manually, they must carefully take their time while considering the orientation of the IC inserted on the printed circuit board. The workability of the attachment work was significantly deteriorated.

Therefore, the main purpose of the present invention is to eliminate the above-mentioned drawbacks by drastically reducing soldering defects, that is, shorts, which occur when soldering is performed using a printed circuit board soldering device, and A printed circuit board grip holding mechanism that enables safe and efficient soldering of high-quality printed circuit boards without relying on the know-how of skilled workers, making it a more versatile printed circuit board soldering device. The goal is to provide the following.

[Means for Solving the Problems] The present invention includes a shaft attached via a bearing to a movable end of a drive device that moves linearly, a T-shaped plate that supports this shaft and provides a swinging motion, and a T-shaped A cam plate with an arc-shaped oblong hole that can be rotated around pins fitted into holes near both ends of the bottom of the plate, and a printed circuit board that is attached to the tip of the shaft to grip the printed circuit board. In a printed circuit board soldering device equipped with a gripping tool, a screw is provided that can rotate on a straight line passing through the axis of the shaft and passing through the center of the printed circuit board to be soldered, and the mounting center of the printed circuit board gripping tool with respect to the shaft is This is a printed circuit board grip holding mechanism in which a center knob that can be attached to the tip of the shaft with a screw or the like is provided so that it is aligned in a straight line.

[Operation] In this invention, the arrangement of the leads of the electronic component inserted into the printed circuit board is examined, and the soldering direction is determined so that short defects will not occur during soldering.
Loosen the screw on the center knob, attach the printed circuit board to the printed circuit board gripper so that a predetermined angle is formed between the printed circuit board and the shaft, and fix the screw.

[Embodiment] Fig. 1 is a front view showing an embodiment of the present invention, Fig. 2 is a side sectional view, and Fig. 3 similarly shows the operation of the soldering device and the process of soldering a printed circuit board. FIG. 4 is a schematic process diagram showing the printed circuit board grip holding mechanism at a right angle (90°) to the shaft.
FIG. 5 is a plan view showing the printed circuit board gripping mechanism attached to the shaft and θ(0<
FIG. 3 is a plan view of the device installed in a state where θ<90°).

First, the configuration of a printed circuit board soldering apparatus will be described with reference to FIGS. 1 and 2. The printed circuit board soldering apparatus includes a vertically extending base 11. This base 11 has a guide 13
A slide base 14 having a U-shaped cross section is mounted so as to be guided by the cylinder 12 and movable vertically by the cylinder 12. An air cylinder 15 is attached to one end of the upper portion of the slide base 14 for causing a T-shaped plate 18, which will be described later, to move in a fan shape. A bearing 16 is screwed to the tip of the cylinder rod of the air cylinder 15. A shaft 17 whose one end is connected to the cylinder 15 is supported by the bearing 16 . Furthermore, two T-shaped plates 18, 18 are attached to the shaft 17 with a predetermined interval therebetween. Holes for fulcrums are formed near both ends of the lower portion of this T-shaped plate 18. A cam plate 19 is inserted between the two T-shaped plates 18, 18, and this cam plate 19 is attached to the slide base 1.
4 by screws. In addition, the cam plate 19
A long arc-shaped hole is formed in the T-shaped plate 18 to match the pitch of the fulcrum hole, and whose radius is the length from the center of each fulcrum hole to the center of the other hole. ing. And T-shaped board 1
Support pins 20 and 20a pass through a pair of holes formed in the lower part of the cam plate 8 and an arcuate long hole of the cam plate 19, respectively.

The hanger 1 is fixed to the other end of the shaft 17 with a screw or the like. The hanger 1 is attached with one fixing screw 2.
A retaining plate 3 is attached so as to be rotatable around the center. A center knob 4 is fixed to this holding plate 3 with a screw or the like. A printed circuit board gripper 5 is attached to the center knob 4. That is, the center knob 4 loosely fits into the inner diameter of the handle portion 5a of the printed circuit board gripping tool 5, and a straight line passes through the center of the surface of the printed circuit board gripped by the printed circuit board gripping tool 5 and the center of the fixing screw 2. The printed circuit board gripper 5 is attached so as to be aligned on top. Furthermore, the hanger 3 is provided with two gripping tool holders 6, 6 for supporting the printed circuit board gripping tool 5, and the distance between these gripping tool holders 6, 6 is adjusted by butterfly bolts 7. Fixed afterwards. A printed circuit board 8 is attached to the printed circuit board gripper 5, and this printed circuit board 8 is attached to a solder tank 9 in which molten solder 10 is stored.
soldering.

In order to solder a printed circuit board using the printed circuit board soldering device equipped with the printed circuit board gripper holding mechanism configured as described above, first, the arrangement of the leads of the electronic components inserted into the printed circuit board 8 is performed. Investigate the soldering direction and determine the soldering direction that will not cause shot defects.

Next, loosen the fixing screw 2 of the printed circuit board holding mechanism in accordance with the soldering direction mentioned above, and then
As shown in FIG. 5, rotate the shaft 17.
The holding plate 3 is fixed by tightening the fixing screw 2 so that there is an angle of θ ₁ between the holding plate 3 and the printed circuit board 8. In the printed circuit board gripping mechanism set in this way, the printed circuit board 8 is gripped by the printed circuit board gripping tool 5, and the handle portion 5a of the printed circuit board gripping portion 5 is fitted into the center knob 4 attached to the holding plate 3.
And it is supported by two gripping tool receivers 6.

From this preparatory stage, we move on to the main soldering work. The process of soldering work will be explained below with reference to FIG. FIG. 3a shows the standby position of the soldering device, and FIG. 3b shows the timing of starting soldering. When the operator turns on the start switch (not shown) of the soldering equipment,
Air cylinder 12 is energized and the cylinder rod extends. Along with this, the slide base 14 is lowered, and the printed circuit board 8 is also lowered together with a series of mechanical parts mounted on the slide base 14. Then, the left end of the printed circuit board 8 is immersed in the surface of the molten solder 10 in the solder bath 9.

Next, the cylinder rod of the air cylinder 15 is gradually extended, and the shaft 17 is pushed to the right via the bearing 16 screwed to the tip of the cylinder rod. At this time, shaft 17
The T-shaped plate 18 fixed to the cam plate 19 is rotatably attached to the cam plate 19 by two fulcrum pins 20, 20a, so the shaft 17
0 as a fulcrum, it moves to the right while drawing an arc whose radius is a straight line connecting the centers of both the fulcrum pin 20 and the shaft 17.

Therefore, the hanger 1 fixed to the shaft 17 moves to the right while swinging about the center of the shaft 17. As a result, a holding plate 3 is attached to the hanger 1 with an angle θ ₁ by a fixing screw 2, a printed circuit board gripper 5 supported by a center knob 4 and a gripper receiver 6, and a Since the printed circuit board 8 is held on the same plane as the fulcrum pin 20,
When the printed circuit board 8 is positioned flush with or parallel to the surface of the molten solder 10 with its left end as a fulcrum, the entire lower surface of the printed circuit board 8 is immersed in the surface of the molten solder 10 . In other words, the state shown in FIG. 3c is reached.

Furthermore, as the cylinder rod of the air cylinder 15 extends, the shaft 17, which had been moving in an arc with the fulcrum pin 20 as a fulcrum, will now move in an arc with the fulcrum pin 20a as a fulcrum, starting from the state shown in FIG. 3c. Start. As a result, the state shown in FIG. 3d is reached, and the printed circuit board 8 is soldered.

Next, when the air cylinder 12 suctions, the slide base 14 rises. On the other hand, air cylinder 1
5 is suctioned with a slight delay, and as a result, the shaft 17 moves to the left end and returns to the state shown in FIG. 3a.
Soldering of the printed circuit board 8 is completed.

In other words, the printed circuit board soldering device, which conventionally had only one direction for soldering the printed circuit board 8 or two directions by changing the gripping direction by 90 degrees, now has soldering characteristics based on the arrangement of the electronic components of the printed circuit board 8. By installing the printed circuit board gripper holding mechanism of the present invention, which can freely change the soldering direction of the printed circuit board 8, soldering work can be performed with very few defects caused by shorts between the leads of electronic components. can be made to do so.

Moreover, the number of man-hours for correction work, which was conventionally required as a post-soldering process, can be significantly reduced, and the soldering work for any printed circuit board 8 can be performed efficiently.

The fixing screw 2 may be used as a positioning pin by using a magnet on either of the contact surfaces of the hanger 1 and the retaining plate 3, and the center knob 4 and the retaining plate 3 may be magnetized.
may be configured integrally.

[Effects of the Invention] As described above, according to the present invention, a screw is provided that can rotate on a straight line passing through the axis of the shaft and the center of the printed circuit board to be soldered, and A center knob that can be attached to the tip of the shaft with a screw etc. is provided so that the mounting center is on a straight line, and the holding direction of the printed circuit board gripping tool can be changed arbitrarily, ensuring uniform quality of soldered printed circuit boards. This allows for efficient soldering work that corresponds to the arrangement of the leads of electronic components inserted into a printed circuit board, without relying on the know-how of the operator. Furthermore, the number of man-hours required for post-process correction work can be significantly reduced. Therefore, defects such as shorts can be reduced in soldering by the printed circuit board soldering device, and printed circuit boards can be soldered with high quality and efficiency.

[Brief explanation of drawings]

FIG. 1 is a front view showing an embodiment of the present invention mounted on a printed circuit board soldering device.
FIG. 2 is also a side sectional view. FIG. 3 is a schematic process diagram showing the operation of the soldering device and the process of soldering a printed circuit board. FIG. 4 is a plan view showing an embodiment of the present invention mounted at right angles (90 degrees) to the shaft of a soldering device. FIG. 5 is a plan view showing the state in which it is attached at an angle θ. In the figure, 1 is a hanger, 2 is a fixing screw, and 3 is a hanger.
is a holding plate, 4 is a center knob, 5 is a printed circuit board gripping tool, 6 is a gripping tool holder, 7 is a butterfly bolt, 8 is a printed circuit board, 9 is a solder tank, 10 is molten solder, 11 is a base, 12 and 15 are air 13 is a guide, 14 is a slide base, 16 is a bearing, 17 is a shaft, 18 is a T-shaped plate, 19 is a cam plate, and 20 is a fulcrum pin.

Claims (1)

[Scope of Claims] 1. A shaft attached via a bearing to a movable end of a drive device that moves linearly; a T-shaped plate that supports the shaft and provides a swinging motion to the shaft;
A cam plate in which an arc-shaped oblong hole is formed so as to be rotatable about pins fitted in holes near both ends of the lower part of the T-shaped plate as a fulcrum, and a cam plate attached to the tip of the shaft to grip a printed circuit board. In the printed circuit board soldering apparatus, the printed circuit board gripping tool is provided with a screw rotatable on a straight line passing through the axis of the shaft and passing through the center of the printed circuit board to be soldered; A printed circuit board holding tool holding mechanism, characterized in that a center knob that can be attached to the tip of the shaft with a screw or the like is provided so that the center of attachment of the tool to the shaft is on the straight line.