JPS58100492A - Automatic soldering device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic warping prevention mechanism for a printed circuit board in a soldering apparatus.

As an automatic soldering device for printed circuit boards, there is a main conveyor K installed on the left and right sides of each device, and a supporting member provided on the main conveyor holds the left and right edges of the printed circuit board while soldering. There are two types of equipment: equipment that performs various processing steps necessary for soldering, and equipment that attaches a printed circuit board to a carrier and completes soldering by transporting the carrier.

The latter device is used for soldering printed circuit boards with a relatively large area by applying a mechanism to prevent warpage of the printed circuit board to the carrier itself. The work of engaging the mechanism with the central part of the front edge of the printed circuit board is complicated and unsatisfactory in terms of work efficiency.

In addition, the former does not use a carrier and directly holds the printed circuit board, so 1. The work efficiency is relatively good, but 4. There is no mechanism to prevent warping of the printed circuit board, so heating with a preheater, heating at the time of soldering, and If warping occurs due to the weight of the electrical components attached, it will not only be difficult to solder properly, but also cause problems such as the printed circuit board falling off the device, so it is important to minimize warping. Each had drawbacks, such as the fact that they could only be used in small areas.

The present invention provides an automatic warp prevention (correction) mechanism for the former type of soldering device that does not use a carrier, thereby making it possible to solder a wide area of printed circuit boards, and providing a device that can measure work efficiency. It is.

To explain one embodiment of the present invention with reference to the drawings, Figure 1 shows a generally known automatic soldering device, in which (1) is a flux application tank, and (2) is a tank for dispersing organic matter from insects. Preheater, (3) is preliminary solder bath, (4)
is a lead wire cutter, (5) is a flux coating tank, (6) is
is a preheater, (7) is a solder plate, and (8) is a printed board i. aυ and a are the bullet substrates according to the present invention (
8) automatic anti-slip mechanism, (//S# (/, /A)
# (/c)(/J) Consists of a set of anti-slip bodies.

Next, the details of this anti-slip mechanism 0υ and a will be explained with reference to the figures.

Anti-slip body (//a), (//A), (/Jsu,
(/JA) Since it has the structure of almost all PI-, (//
I will explain the structure of the α-ri as a representative, but before that, I will explain the main conveyance body.
The main transport body that circulates in the horizontal direction is installed separately on both sides of an automatic soldering device consisting of the following members; only one side of it is shown in Figure 1, and the other side is omitted. It is.

The chain block of this main carrier Q7J has a large number of upper sides of support rods 0 of each fil, and each support rod α
At the inner end of the lower side of the board (8), there is a drum-shaped gripping member (a) for clamping both sides of the board (8).

Since the main carrier Q3 equipped with this support rod 0 is already in general use, a detailed explanation will be omitted. And the connecting shaft Q of each chain block of this main transport body α! 9 is extended upward, and a connecting plate is loosely fitted into each of the extended connecting shafts α9 so as to be vertically movable with a rotation stopper structure.

Next, the anti-slip body (//a) will be explained. This body is constructed as described below.

aη is a plywood board kept horizontal, and the base plate αη is engaged with the soldering device on the guide side which is mounted on a shaft parallel to the conveyance direction of the main conveyance body α2, and the base plate αη is It is guided so that it can reciprocate over a certain distance, that is, from the upper side to the lower side of the solder baths (3) and (7).

At the bottom of the inner end and the bottom of the outer end of this plywood aη, excitation magnets (A) are provided, and one magnet a! When J is excited, the connecting plate is attracted to it, and the base plate αη, more specifically, the warpage prevention body (//) is moved together with the main conveyor a′JJ, and the other! When the magnet ■ is excited, K is attracted to the magnet (2G) and the warpage prevention body (// is restored). The magnets α and ■ of each magnet are set to -1 so that they can be instantly switched by an electric circuit.

A grooved guide body (A) is vertically disposed on the base plate aη, and the guide body (roller) K and elevating body (C) are attached so as to be movable up and down. A cylinder ■ equipped with an ascent and descent speed regulator (to) and an @ is connected to the end of a connecting rod that protrudes horizontally on the outside of this elevating body (c), and the elevating and lowering of this cylinder Due to the action, the above-mentioned elevating body (2)
is moved up and down by a predetermined stroke using the guide body (2) as a guide.

tiInside the elevating body (c) above, there is a horizontal telescoping rod (c).
is provided, and a cylinder holder equipped with an ascending and descending speed regulator (-tb) is installed vertically above the tip, and a cylindrical body (to) is installed below the tip. Si1
It is located Km coaxially with the cylinder.

As is clear from the figure, this cylinder has a rotatable upper part with a fan-shaped engagement claw r31) at the lower end, and also has a rotatable upper part. The rod (b) end of the cylinder rod is rotatably inserted into the hole (b) provided in the upper part of the rad. And this rod (b)
A bottle (to) is provided at the end of the
is fitted into a spiral groove C119 provided on the half circumference of the hole (to) of the rod (to), and the rod (B) of the cylinder (2) is fitted into a keyway with respect to the cylinder body (to) K. Since the structure prevents rotation, the vertical movement of the rod (to) is prevented. Due to the related structure of the bottle (to) and the spiral groove (to), the rod with the engaging pawl GD is /1 It is configured to rotate back and forth.

Each break prevention body (//su, (tth), (/Jsu, (
The l-cori is constructed as described above, but next, to explain its function in Figure 5 (//su, (tth) K), (//@) and (11b) are semicircular tanks. On the upper side, they are in the relative position as shown in the figure.

Then, the printed circuit board (8) enters in the direction of the arrow, and the optical axis of the phototube device (b) arranged above and below is aligned with the printed circuit board IN.
(8) When the tip end is disconnected and the printed circuit board (8) advances by a distance preset by the electric, ie, shift register circuit, the magnet 0 of the anti-slip body (//a) is excited. , the connecting plate (LE is this magnet) of the main transport body a3 is attached, and the warpage prevention body (// is moved along with the main transport body a2.
The cylinder (c) and rod (b) of a) are lowered,
This rod (to) is set in a 9-bin can, and the action of the spiral groove (to) of the machitsudo (2) causes the rod (2) to rotate /If (b), so that the rod (0) is moved at a constant stroke (to). ...about 10
m) to place the engaging claw 6υ on the lower surface of the printed circuit board (8), thereby correcting the warping caused by the heating of the preheater and the weight of the attached electrical parts.

Then, the rear end of the printed circuit board (8) passes through the optical axis of the phototube device, this optical axis is electrically connected, and the printed circuit board (8) is further moved by a distance set in advance by the electrical or shift resist circuit. As it moves forward, the magnet 0 on one side of the anti-slip body (//) is excited, and in the same way as above, this anti-slip body (ti) is connected to the main carrier α, and at the same time as it starts moving, the cylinder Then, by the action of another cylinder, the rod (2) is rotated and moved up by a distance, and the printed circuit board (8) is moved to the lower side of the rear end. Correct contact warping.

In this way, when the preliminary or main soldering work is completed with the front and rear center parts of the printed circuit board (8) supported by the engaging claws, (//s, (11 rods C33
is lowered at the same time by the action of the cylinder rod, and simultaneously rotates by the action of the spiral groove (end), and the engaging pawl o1
) to escape outside the silhouette range of the printed circuit board (8).

゛ Next, by the action of the other cylinder (5), (//a) and (//A) are simultaneously raised by the distance of the bird, and at the rising end - the magnet (19) is de-energized, (//α ) and (// are insulated from the main transport body a2. The magnet (a) on the side after this insulation is switched and excited at the same time as the magnet al is insulated, and (//a) and (ll are simultaneously insulated from the main transport body a2. body (2υ) and returned to its original position, specifically, at the top of the solder tank (3) and (7).
Become.

That is, when one of the deflection prevention bodies (11b) reaches the home position, the magnet (1) of this body is de-energized, and (11b) stops at its position t~. In other words, it is the state shown in Figure 15. The other Seven Mysterious Prevention Body (//a) continued to return, and reached 15
At the - position in the diagram! As soon as the magnet (2) is de-energized and stops, it stops at a position where it has descended by the stroke of the bird due to the effect of cylinder punishment, and is ready for the next work.

Thereafter, similar actions are used to automatically and continuously correct and prevent distortion of the printed circuit board. In addition, - is printed, board (8
) is set to be approximately the same length as the In addition, the warpage prevention body (l stiffness λ (l stiffness) has exactly the same effect as above, so its explanation will be omitted. The position is changed so that it is longer than the length a of the printed circuit board. Also, at about -14 = /-Jm, the tip of the printed circuit board (8) is in the center of the rod 03KIi of (//a) and (/J). This is to prevent

As described above, according to the present invention, with a simple configuration, soldering is performed while correcting the distortion caused by the heating by the preheater and the weight of the electrical components, and furthermore, the distortion caused by heating the solder tank is forcibly prevented. However, automatic continuous soldering of printed circuit boards can be performed, and good soldering can be achieved by using a soldering device that does not use a carrier, which previously only used small-area printed circuit boards, when soldering large boards. It has excellent features such as being able to perform tasks efficiently and efficiently.

[Brief explanation of the drawing]

Figure 1 is a layout explanatory diagram showing the entire device, Figure 11 is a front view of the anti-slip body which is the main part of the device of the present invention, Figure 13 is a plan view of the same, and Figure 1 is a diagram showing the rotation mechanism of the engaging claw. The partially cutaway front view and S figure shown are operation explanatory views.

Claims (1)

[Claims] In automatic soldering equipment that does not use a carrier for holding and transporting printed circuit boards, during the soldering process or lead wire terminal cutting process that requires prevention of board warpage, The fourth feature is that it is equipped with an automatic warpage prevention mechanism that can be moved forward and back using another conveyor, and that can accommodate any size printed circuit board and any conveyance speed. automatic soldering equipment.