JP2540575Y2 - Transfer equipment for automatic soldering equipment - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transfer device for an automatic soldering device, and more particularly to a chain rail on which a chain on which a printed circuit board is loaded is guided by constantly applying a tensile force to the chain rail due to aging and temperature. The present invention relates to a transfer device of an automatic soldering device that automatically absorbs the elongation of the printed circuit board to prevent warping of the chain rail and prevents the transfer trajectory of the printed board from being curved.

[0002]

2. Description of the Related Art Printed circuit boards are usually loaded and conveyed on a pair of chains traveling in the same direction at the same speed. In the conventional conveying device, however, the chains are wound around a plurality of sprockets fixed to a base. Thus, the sprocket is rotated by a driving device such as a motor, and the chain is guided and run by a chain rail.

However, according to the conventional conveying device, the chain rail is constantly exposed to a high temperature of about 250 ° which is the soldering temperature. Although it is absorbed by the elongation absorption mechanism, elongation itself is allowed.However, since it elongates in a high temperature state, its own weight and the weight of the chain or the board act downward, so in a part with a long span, solder During the attaching work, the chain rail may warp downwardly, and in such a case, the transfer trajectory of the substrate also curves downwardly convex, so that soldering conditions may change, There is a drawback that the soldering performance varies and the defective soldering rate increases.

[0004]

SUMMARY OF THE INVENTION The present invention has been made to eliminate the above-mentioned drawbacks of the prior art, and has as its object to provide a chain rail on which a chain for transporting a substrate is guided and travels. To keep the chain rail in tension by pulling the chain rail so as to always apply a pulling force to the chain rail, thereby preventing the chain rail from warping downward at a high temperature during the soldering operation. And to prevent the transfer trajectory of the substrate from being curved convexly downward, so that the soldering conditions are not changed so that stable soldering performance is always obtained.

[0005]

SUMMARY OF THE INVENTION In short, the present invention relates to a transfer device of an automatic soldering device for loading and transferring a printed circuit board on a pair of chains wound around a plurality of sprockets and traveling in the same direction at the same speed. A chain rail on which at least a pair of the sprockets of the plurality of sprockets are rotatably mounted and arranged to extend and contract in a direction parallel to the running of the chain; and pulling the chain rail, always pulling the chain rail. And a tension applying device for applying a force.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on an embodiment shown in the drawings. Referring to FIGS. 1 to 4, the transfer device 1 of the automatic soldering device according to the present invention includes a chain rail 2 and a tension applying device 3.

Referring to FIG. 1, first, an automatic soldering device 4
Will be described. The housing 5 of the automatic reflow soldering apparatus 4 has pre-heating chambers PH ₁ , P
A heating chamber 8 divided into H ₂ , a reflow soldering chamber RF, and a slow cooling chamber CL is formed, and the structures of the respective chambers are substantially the same except that the internal temperature is different.

In the preheating chambers PH ₁ and PH ₂ , the reflow soldering chamber RF and the annealing chamber CL, a pair of known endless chains 9 as an example of the transfer device 1 are fixed to the support rails 10 so as to penetrate the preheating chambers PH ₁ and PH ₂ . Many fixed sprockets 1
1. Idle sprocket 12 and driving sprocket 1
It is wound around 3 and arranged.

An endless chain 19 is wound between a sprocket 15 fixed to a rotating shaft 14 of a driving sprocket 13 and a motor sprocket 18 of a motor 16, and the motor 16 rotates the pair of endless chains 9.
Is configured to travel.

Then, the substrate (not shown) carried in the carry-in station 20 is carried rightward in the drawing, and sequentially carried to the preheating chambers PH ₁ and PH ₂ , the reflow soldering room RF and the annealing room CL. And is carried out to the carry-out station 21.

Referring to FIGS. 2 to 4, the chain rail 2 is for applying tension to a pair of endless chains 9 and has a T-shaped groove 2a formed therein. 2a is provided with a support rail 10 formed in the same shape.
Of the chain rail 2 is slidable in the running direction of the chain 9 (directions of arrows A and B).

An idle sprocket 12 is rotatably mounted on the chain rail 2 by means of a shaft 22 so that the idle sprocket 12 can move together with the chain rail 2 in the direction of arrow A or B.

The tension applying device 3 is for applying tension to the chain 9, and a first embodiment of the present invention is shown in FIG.
Referring to FIG. 3, a pair of winding transmission members 28 are wound around pulleys 25 and 26 rotatably mounted on shafts 23 and 24, one end of which is connected to the chain rail 2.
The other ends are respectively fixed to the weights 29, and are configured to always pull the chain rail 2 in the direction of the arrow A by the force in the direction of the arrow C due to gravity, and always apply a constant tension to the chain rail.

The tension applying device 3 according to the second embodiment of the present invention comprises:
4 and 5, a male screw 33 having a handle 32 fixed to one end is screwed to a female screw 31 having a square hole guide portion 31a fixed to the base 30.

At the end of the male screw 33, a square hole guide portion 31a is provided.
A spring holding block 34 that is slidably fitted to is mounted rotatably. A tension spring 3 as an example of an elastic member is provided between the spring holding block 34 and the chain rail 2.
5, the chain rail 2 is pulled in the direction of arrow A to constantly apply a constant tension to the chain rail.
5 can be changed.

The present invention is configured as described above,
Hereinafter, the operation will be described. 1 to 5, a motor (16) is rotated to drive a pair of endless chains (9) through an endless chain (19) and a driving sprocket (13), and a substrate (not shown) loaded from a loading station (20) is moved to the right in the drawing. After soldering while transporting in the direction,
It is carried out to the carry-out station 21.

Here, when the chain rail 2 is elongated due to heating or change over time due to soldering, in the first embodiment, the weight 29 descends in the direction of arrow C and pulls the chain rail 2 in the direction of arrow A. The elongation of the chain rail 2 is absorbed. In this case, the weight 29 is slightly lowered, but the acceleration of the gravitational force acting on the weight does not change depending on its position, so that exactly the same tension is still applied to the chain rail 2.

Therefore, even if the chain rail 2 warps downwardly due to its own weight or the weight of the chain 19 and the substrate, the tension caused by the weight 29 resists the warping, and the chain rail 2 almost projects downward. And will always be kept straight.

Therefore, the board can be stably transferred without the board's transfer trajectory curving downward, thereby preventing a change in the soldering conditions due to the warpage of the chain rail, and ensuring good soldering at all times. Performance is guaranteed.

Also in the second embodiment, when the chain rail 2 is extended, the extension of the chain rail is absorbed by the tension spring 35, and the tension is still applied to the chain rail.

In this case, unlike the first embodiment, the tension of the tension spring 35 is slightly reduced, so that the tension is reduced. However, the change is very small and does not pose a problem in practical use. If the tension is insufficient, it is of course possible to rotate the handle 32 to slightly increase the tension of the tension spring 35 to compensate for the decrease in tension. The presence of the tension of the tension spring 35 prevents the chain rail 2 from warping downward during soldering, and the same operation and effect as in the first embodiment can be obtained.

According to the present invention, as described above, the chain for transporting the substrate is guided and the chain rail that travels is pulled to always apply a tensile force to the chain rail. This has the effect of preventing the chain rail from warping downward at high temperatures during the soldering operation. Therefore, there is an effect that the soldering conditions are not changed and stable soldering performance is always obtained.

[Brief description of the drawings]

FIG. 1 is an overall front view of an automatic soldering apparatus.

FIG. 2 is an overall front view of the tension applying device according to the first embodiment.

FIG. 3 is a perspective view of a main part of the tension applying device according to the first embodiment.

FIG. 4 is a front view of a main part of a tension applying device according to a second embodiment.

FIG. 5 is a perspective view of a partly broken main part of a tension applying device according to a second embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Conveying device of an automatic soldering apparatus 2 Chain rail 3 Tension applying device 9 Chain 11 Sprocket 25 Idle roller 26 Idle roller 28 Winding transmission member 29 Weight 31 Female screw 33 Male screw 35 Tension spring as an example of an elastic member

Claims (3)

(57) [Scope of request for utility model registration] 1. A transfer device of an automatic soldering apparatus for loading and transferring a printed circuit board on a pair of chains wound around a plurality of sprockets and traveling in the same direction at the same speed, wherein at least one pair of the plurality of sprockets is provided. A chain rail on which the sprocket is rotatably mounted so as to be extendable and contractible in a direction parallel to the running of the chain, and a tension applying device for pulling the chain rail and constantly applying a tensile force to the chain rail. A transfer device for an automatic soldering device, comprising: 2. The automatic soldering device according to claim 1, wherein the tension applying device is a weight having a winding transmission member fixed at one end to the chain rail via an idle roller. Equipment transport device. 3. The automatic soldering device according to claim 1, wherein the tension applying device is an elastic member having one end fixed to the chain rail and the other end engaged with a female screw screwed into a male screw. Conveyor for mounting equipment.