JPH0469505B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention provides a method for lowering and raising the printed circuit board, when the printed circuit board being conveyed while being held by the holding claws of the conveyance chain reaches the position of the solder bath. The present invention relates to a soldering device that performs predetermined processing on printed circuit boards.

[Conventional technology]

FIG. 5 is a configuration diagram of the main parts showing an example of a conventional carrierless soldering device, in which 1 is a printed circuit board;
2 is an electronic component mounted on the printed circuit board 1;
3 is a lead wire of the electronic component 2; 4 is a transport chain that rotates in the horizontal direction; 5 is a holding claw that holds the printed circuit board 1 fixed to the transport chain 4; 6 is a guide rail of the transport chain 4; 8 is a solder bath that can be moved up and down, and 8 is a solder melt.

In this way, since the printed circuit board 1 is held by the holding claws 5, it is not possible to transport the printed circuit board 1 and lower it to the position corresponding to the solder bath 7. The soldering process was carried out by raising it in the direction of arrow A until the end of the process.

[Problems to be Solved by the Invention] For this reason, a drive device and a mounting device with a large output are required to raise and lower the solder bath 7, so the entire soldering device becomes large and difficult to manufacture.
There were problems such as the cost and effort required for installation.

In addition, when soldering the printed circuit board 1 with the conventional carrier-less soldering device described above, in order to lower and raise the printed circuit board 1 at an incline to sufficiently vent gas and cut the solder, the conveyor chain 4 must be gently moved. Since the printed circuit board 1 cannot be lowered or raised unless it has a certain slope,
There was a problem in that the length of the transport chain 4 for lowering and raising the printed circuit board 1 became longer, and the overall shape of the soldering apparatus became larger.

This invention has been made to solve the above problems, and provides a soldering device in which the posture of a printed circuit board held by holding claws can be controlled arbitrarily by lowering and raising a conveying chain. With the goal.

[Means for solving problems]

The soldering device according to the present invention divides the conveyance chain into a front-stage conveyance chain and a second-stage conveyance chain with respect to the running direction of the printed circuit board, and solders the printed circuit board between these two divided conveyance chains. In order to perform this, a central conveyance chain that conveys the printed circuit board from the previous conveyance chain to the latter conveyance chain is inserted, and the front and rear ends of this central conveyance chain are lowered separately in the direction of travel of the printed circuit board. In order to raise the rods, the rods are connected to the guide rails of the central conveyance chain via guide plates and support plates, respectively, and each rod is provided with cams that move these rods up and down and a motor that rotates these cams. On the other hand, among the sprockets that run the front-stage conveyance chain and the rear-stage conveyance chain behind and in front of the central conveyance chain, the side facing the rear end and front end of the central conveyance chain is provided. In order to move each sprocket backward and forward in the running direction of the printed circuit board, a second drive device is provided which includes a rod attached to each sprocket and an air cylinder for moving the rod in and out.

[Effect]

In this invention, when the printed circuit board arrives at the soldering device, the first drive device is activated to lower the central conveying chain to perform soldering, and after soldering is completed, the printed circuit board is raised to the initial position. Return to position. Also, when the central conveyance chain descends or rises, the second drive device operates to widen the gap between the front and rear conveyance chains.
Make sure that the central conveyance chain does not touch the ends of the front and rear conveyance chains.

〔Example〕

FIGS. 1a and 1b are a side view and a front view showing an embodiment of the present invention. In these figures, the same reference numerals as in FIG. 5 indicate the same parts, 11 indicates the main parts of the soldering device, and 12 indicates a central conveying chain provided on both sides of the printed circuit board 1, which rotates in the horizontal direction. do. 13 is a holding claw, 14 is a guide rail for the central conveyance chain 12, 15 is a sprocket, 16 is a drive gear for running the central conveyance chain 12, 17 is a drive shaft to which the drive gear 16 is attached, and 18 is a roller chain. , 19 is a motor,
20 is a support plate, 21 is a screw rod, 22A is a guide plate screwed onto the screw rod 21, and the printed circuit board 1
to determine the axial position of the central conveying chain 12. 22B is the screw rod 2
The guide plate 23 loosely fitted in the guide plate 1 is a guide shaft on which the guide plate 22A is loosely fitted and the guide plate 22B is fixed, and is fixed to the support plate 20. 24
A and 24B are removable gears, and when the threaded rod 21 is lowered, the gear 24B is separated from the gear 24A to prevent the roller chain 25 from slackening. 2
6 is a motor, 27 is a fixed shaft fixed to the support plate 20, 28 is a link-shaped hinge fitted to the fixed shaft 27, 29 is a rod into which the hinge 28 is loosely fitted, and 30 is connected to the hinge 28. A pin 31 connects the rod 29; 31 is an outer cylinder that slidably supports the rod 29; 32 is a support base to which the outer cylinder 31 is attached, and is fixed to the fixing frame 33 of the soldering device 11 via a mounting bolt 34. has been done. 35 is a cam, 36 is a camshaft, and 37 is a bearing for the camshaft 36, which is fixed to the mounting base 32. 38 is a roller rotated by the cam 35, 39 is a bearing for the roller 38, 40 is a connecting plate that connects the rod 29, 41 is a drive gear for the camshaft 36, 42 is a drive shaft, 43 is a roller chain, and 44 is a motor, 4
5 is a sprocket attached to the screw rod 21;
46 is a roller chain. Thus, FIGS. 1a and 1b show the entire first drive device 47 for lowering and raising the central conveying chain 12. Further, 51A is a front-stage conveyance chain, and 51B is a rear-stage conveyance chain, the details of which are shown in FIGS. 2 and 3.

Figure 2 shows each conveyor chain 12, 51 in Figure 1a.
A, 51B is a plan view showing the structure of the portion 51B, and FIGS. 3a, b, and c show the main parts of FIG. Figure c is the third
FIG. 3 is a sectional view taken along the - line in FIG. In these figures, the same symbols as in Fig. 1 indicate the same parts,
The front-stage transport chain 51A is provided at the rear of the solder bath 7 with respect to the running direction of the printed circuit board 1 (direction of arrow B), and the rear-stage transport chain 51B is provided at the front. 52 denotes each of the conveyance chains 51A, 5
1B is a holding claw, 53 is an air cylinder provided in the horizontal direction, 54 is a rod, and 55 is the rod 54.
a fixture attached to the fixture; 56 is the fixture attached to the fixture 55;
57 is a mounting plate for fixing the air cylinder 53; 58 is a sprocket attached to the rod 5;
4 a guide member, 59 an air cylinder provided in the height direction, 60 a rod, 61 a fixture, 62
63 is a sprocket attached to the fixture 61, 63 is a fixed sprocket, 64 is a mounting plate for fixing the cylinder 59, and 65 is a drive sprocket for each of the conveyance chains 51A, 51B. Thus, in FIGS. 2, 3a, 3b, and 3c, reference numeral 66 designates the second drive device for moving the sprocket 56.

Next, the operation will be explained.

The printed circuit board 1 with the electronic component 2 mounted thereon is held by the holding claws 52 of the preceding transport chain 51A and travels in the direction of the arrow B through a fluxer and a preheater (not shown). Then, the motor 19 is placed in front of the solder bath 7.
is transferred to the holding pawl 13 of the central conveyance chain 12 running in the direction of arrow B via the roller chain 18, drive shaft 17, and gear 16. At this time, the air cylinders 53 of the conveyance chains 51A and 51B are activated, and when the rod 54 is retracted into the air cylinders 53, the sprocket 56 of the preceding conveyance chain 51A is moved in the opposite direction of arrow B via the fixture 55. In this direction, the sprocket 56 on the side of the rear conveyance chain 51B moves in the direction of arrow B (the position indicated by the two-dot chain line in FIG. 4), and the sprocket 56 on the side of the conveyance chain 51B in the latter stage moves in the direction of arrow B (the position indicated by the two-dot chain line in FIG. Do not obstruct the passage of 15. At the same time, when the air cylinder 59 is operated and the rod 60 is retracted into the air cylinder 59, the sprocket 62 is lowered via the fixture 61, so that the preceding conveyance chain 51A does not slacken.

Next, the rotation of the motor 44 causes the cam 35 to rotate via the drive shaft 42 and the camshaft 36. Then, as the cam 35 rotates, the central conveyance chain 12 is lowered via the rod 29, the hinge 28, the support plate 20, each guide plate 22A, 22B, and the guide rail 14.

Therefore, as shown in FIG. 4, the central conveyance chain 12 descends while its front direction in the direction of arrow B is inclined downward. Next, the central conveying chain 12
is placed in a horizontal position, and the printed circuit board 1 is immersed in the solder melt 8. Then, the front of the central conveyance chain 12 is raised upward to return to the original horizontal position, and the printed circuit board 1 is immersed in the solder melt 8. It is located so that it can be easily transferred from the chain 12 to the conveyance chain 51B. At this time, the printed circuit board 1 moves to a position in front of the central conveyance chain 12.

At the same time, each air cylinder 53, 59 of each conveyance chain 51A, 51B, each sprocket 56,
Since sprocket 62 operates in the opposite manner to that described above, each sprocket 56, 62 returns to its original position as indicated by the solid line.

Next, the printed circuit board 1 is transferred to the central transport chain 1.
2 to the downstream conveyance chain 51B, and further conveyed to the next stage cooling device (not shown).

〔Effect of the invention〕

As explained above, the present invention divides a conveyance chain into a front-stage conveyance chain and a rear-stage conveyance chain with respect to the traveling direction of the printed circuit board, and solders the printed circuit board between the two divided conveyance chains. In order to carry out the process, the central conveyance chain that conveys the printed circuit board from the former conveyance chain to the latter conveyance chain is inserted, and the front and rear ends of this central conveyance chain are lowered separately in the running direction of the printed circuit board. In order to raise the rods, the rods are connected to the guide rails of the central conveyance chain through guide plates and support plates, respectively, and a second motor is equipped with cams that move these rods up and down and motors that rotate these cams. On the other hand, among the sprockets that run the front-stage conveyance chain and the rear-stage conveyance chain behind and in front of the central conveyance chain, each sprocket on the side opposite to the rear end and front end of the central conveyance chain is provided. In order to move the sprockets backwards and forwards in the running direction of the printed circuit board, a second drive device including rods attached to each sprocket and an air cylinder for moving the rods in and out is provided. The lift can be moved up and down freely at positions corresponding to the equipment necessary for the soldering process. For this reason, compared to conventional carrier-less soldering equipment that moves the solder bath up and down, the entire soldering equipment can be made smaller, reducing the labor and costs involved in manufacturing and installation. .

In addition, since it is now possible to tilt the printed circuit board at a large angle and freely lower and raise it, it is possible to sufficiently remove air from the soldering surface of the printed circuit board and cut the solder, and to transport the printed circuit board. Since the distance can be shortened, the soldering device can be downsized.

In addition, the printed circuit board can be smoothly and reliably transferred from the front conveyance chain to the central conveyance chain, and from the central conveyance chain to the rear conveyance chain.

Further, by changing the shape of the cam, there are advantages such as the ability to freely change the processing time for lowering and raising the printed circuit board and for soldering.

[Brief explanation of the drawing]

1A and 1B are a side view and a front view showing an embodiment of the present invention, FIG. 2 shows the main parts of Fig. 2, Fig. 3 a is a side view, Fig. 3 b is a side view, Fig. 3 c is a sectional view taken along the - line of Fig. 3 a, and Fig. 4 shows the conveyance chain and print. FIG. 5, which is an explanatory diagram showing the operation of the board, is a configuration diagram of a main part of an example of a conventional soldering device. In the figure, 1 is a printed circuit board, 7 is a solder bath, 8 is a solder melt, 11 is a soldering device, 12 is a central conveyance chain, 13 and 52 are holding claws, 14 is a guide rail, 15 is a sprocket, 16, 41 is a drive gear, 17 and 42 are drive shafts, 20 is a support plate, 2
1 is a screw rod, 22A, 22B are guide plates, 23 is a guide shaft, 24A, 24B are gears, 28 is a hinge, 29, 54 are rods, 31 is an outer cylinder, 35 is a cam, 36 is a camshaft, 37 is a bearing , 38 is Laura,
40 is a connecting plate, 43 is a roller chain, 44 is a motor, 47 is a first drive device, 51A is a front-stage conveyance chain, 51B is a rear-stage conveyance chain, 53 is an air cylinder, 55 is a fixture, 56 is a sprocket,
57 is a mounting plate, and 66 is a second driving device.

Claims (1)

[Claims] 1. In a soldering device in which a printed circuit board is held by holding claws of a conveyance chain provided on both sides and soldered in a solder bath, the conveyance chain is connected to the preceding conveyance chain with respect to the running direction of the printed circuit board. a central conveyance chain for transporting the printed circuit board from the former conveyance chain to the latter conveyance chain in order to solder the printed circuit board between the two divided conveyance chains; In order to insert the chain and lower and raise the front end and the rear end of the central conveyance chain separately with respect to the traveling direction of the printed circuit board, a guide plate and a support plate are respectively provided on the guide rail of the central conveyance chain. A first drive device is provided, which connects the rods through the central conveyor chain and includes cams for moving the rods up and down, and a motor for rotating the cams, while a first drive device is provided at the rear and front of the central conveying chain. Among the sprockets for running the front-stage conveyance chain and the rear-stage conveyance chain, each sprocket on the side opposite to the rear end and front end of the central conveyance chain is moved backward and forward in the running direction of the printed circuit board. ,
A second rod comprising a rod attached to each sprocket and an air cylinder for moving the rod in and out.
A soldering device comprising: a drive device.