JPS6356355A - Soldering device - Google Patents

Abstract

PURPOSE:To incline the center transfer chain holding a printed board and to miniaturize the device with its soldering by dividing the transfer chain into the front step and rear step, inserting the center transfer chain between both transfer chain and lifting the front end and rear end thereof individually. CONSTITUTION:A transfer chain is divided into the front step transfer chain 51A and rear step transfer chain 51B. The center transfer chain 12 is then inserted between the divided transfer chain 51A and 51B, rods 29, 29 are connected via guide plates 22A, 22A and supporting plate 20 to the guide rail 13 of the center chain 12 and the cams 35, 35 vertically moving the rods 29, 29 and the motor 44 to rotate the cams 35, 35 are provided. A printed board 1 is then subjected to a soldering treatment by individually descending and scending respectively the front end and rear end of the center transfer chain 12. On the other hand, the air cylinder moving to the rear part and front part the sprocket opposing to the rear end and front step of the center transfer chain 12 of the sprocket to travel the front step and rear step transfer chains 51A, 51B is provided. Consequently the center transfer chain 12 can freely be moved vertically.

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 conveying chain reaches the position of the solder bath. The present invention relates to a soldering device that performs necessary processing on printed circuit boards.

[Conventional technology]

FIG. 5 is a configuration diagram of the main parts of an example of a conventional carrier-less soldering device, in which 1 is a printed circuit board, 2 is an electronic component mounted on the printed circuit board, and 3 is a lead wire of the electronic component 2. , 4 is a conveyor chain that rotates in the horizontal direction. Reference numeral 5 designates a holding claw for holding the printed circuit board 1 fixed to the conveyance chain 4, 6 a guide rail for the conveyance chain 4, 7 a solder bath that can be moved up and down, and 8 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. Until then, soldering was performed using JZM in the direction of arrow A.

[Problem that the invention seeks to solve]

For this reason, a large-output drive device and mounting device are required to raise and lower the soldering bath 7, so the entire soldering device is manufactured in a large size.

There were problems such as the cost and labor required for installation, etc. Also, when soldering to the printed circuit board 1 using the conventional carrier-less soldering device described above, the printed circuit board 1 must be lowered and raised while tilting. In order to sufficiently vent the gas and cut the solder, the printed circuit board 1 cannot be lowered or raised unless the conveyor chain 4 is gently sloped.

Transport chain 4 for lowering and raising the printed circuit board 1
There was a problem in that the length of the soldering pad became long and the shape of the entire device became large.

This invention was made to solve the above nine problems, and it is possible to arbitrarily control the posture of the printed circuit board held by the holding claws by lowering the conveying chain. The purpose of soldering is to obtain equipment.

[Means for solving problems]

The soldering device according to the present invention divides the conveyance chain into a front conveyance chain and a rear conveyance chain in the running direction of the printed circuit board, and solders the printed circuit board between these divided reconvey chains. In order to perform the attachment, the transfer chain is moved from the front conveyor chain to the rear conveyor chain L-7,1:
Insert the central conveying chain that conveys the board, and in order to lower and raise the front and rear ends of the central conveying chain separately in the running direction of the printed circuit board, guide them to the guide rails of the central conveying chain. A first drive device is provided, which connects the rods through a plate and a support plate, and includes cams that move these rods up and down, and a motor that rotates these cams. Of the sprockets that run the front-stage conveyance chain and the rear-stage conveyance chain rearward and forward, 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. Therefore, a second drive device is provided that includes a rod attached to each sprocket and an air cylinder that moves the rod in and out.

[Function] □ 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 the soldering is completed, the printed circuit board is moved to the soldering device. Raise the board to return to its original position. Also, when the central conveyor chain descends and moves upward, the second
The drive device operates to widen the gap between the front and rear conveyor chains, so that the central conveyor chain does not come into contact with the ends of the front and rear conveyor chains.

〔Example〕

FIGS. 1(a) and 1(b) 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;
5 is a sprocket, 16 is a drive gear for driving the central conveying chain 12, 17 is a drive shaft to which the drive gear 16 is attached, 18 is a roller chain, 19 is a motor, 2o
21 is a support plate, 21 is a screw length, and 22A is a guide plate screwed onto the screw rod 21, which moves in accordance with the width of the printed circuit board 1 and determines the position of the central conveyance chain 12 in the width direction.

22B is a guide plate loosely fitted to the screw rod 21;
Reference numeral 3 denotes a guide shaft into 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. 26 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 that loosely fits the hinge 28, and 30 connects the hinge 28 and rod 29. The pin 31 is an outer cylinder that slidably supports the rod 29, and the pin 32 is a support base to which the outer cylinder 31 is attached, and is fixed to a fixed frame 33 of the soldering device 11 via a mounting port 34. 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 of the roller 38, and 40 is the opening/end 2.
9, 41 is a drive gear for the camshaft 36, 42 is a drive shaft, 43 is a roller chain, 44 is a motor,
45 is a sprocket attached to the screw rod 21, 46
is Laura Chen. In this way, Fig. 1(a), (
In b), the entire first drive device 47 for lowering and raising the central conveying chain 12 is shown. 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゜51A in Figure 11 (a),
Plan view showing the configuration of the portion 51B, FIGS. 3(a) and 3(b)
), (C) show the main parts of Figure 2, and Figure 3 (a)
is a side view, Figure 3(b) is a front view, and Figure 3(c) is a third
FIG. 3 is a cross-sectional view taken along line II in FIG. In these figures, the same reference numerals as in FIG.
1B is provided at the front. Reference numeral 52 denotes a holding claw of each of the conveying chains 51A and 51B, 53 an air cylinder provided in the horizontal direction, 54 a rod, 55 a fixture attached to the rod 54, and 56 a sprocket attached to the fixture 55. , 57 is the air cylinder 53
58 is a guide member for the rod 54; 59 is an air cylinder provided in the height direction; 60 is a rod; 61 is a fixture; 62 is a sprocket attached to the fixture 61; fixed sprocket,
Reference numeral 64 represents a mounting plate for fixing the cylinder 59, and reference numeral 65 represents a drive sprocket for each of the transport chains 51A, 51B. In this way, Fig. 2, Fig. 3 (a), (b), (c)
66 indicates a second driving device that moves the sprocket 56.

Next, the operation will be explained.

The printed circuit board 1 with the electronic components 2 mounted thereon is held by the holding claws 52 of the preceding conveyance chain 51A, and is held by a fluxer (not shown).
It travels in the direction of arrow B through the preheater. Then, in front of the solder bath 7, the roller chain 1 is driven by the motor 9.
8. Drive shaft 17. It transfers to the holding pawl 13 of the central conveying chain 12 running in the direction of arrow B via the gear 16.

At this time, the air cylinders 53 of each of the conveyor chains 51A and 51B operate, and the rod 54
When retracted inward, the sprocket 56 of the front conveyance chain 51A moves in the direction opposite to the direction of arrow B via the fixture 55, and the sprocket 56 of the rear conveyance chain 51B moves in the direction of arrow B (as shown by the two-dot chain line in FIG. 4). position) and when the central conveying chain 12 is lowered (raised), the central conveying chain 1
2 and sprocket 15 so as not to obstruct their passage. 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 extension tool 61, so that the preceding conveyance chain 51A does not slacken.

Next, the rotation of the motor 44 causes the drive shaft 42. The cam 35 rotates via the camshaft 36. Then, due to the rotation of the cam 35, the rod 29. Hinge 28. Support plate 20. The central conveyance chain 12 is lowered via the guide plates 22A, 22B and the guide rail 14.

Therefore, as shown in FIG. 4, the central conveying 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, and then the front of the central conveying chain 12 is raised upward to return to the original horizontal position. Transport chain 1 with printed circuit board 1 in the center
2 to the conveyor 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 conveyor chain 51A, 51B. Since each sprocket 56.62 operates in the opposite manner to that described above, each sprocket 56.62 returns to its original solid line position.

Next, the printed circuit board 1 is smoothly transferred from the central conveyance chain 12 to the subsequent conveyance chain 51B, and is further conveyed and moved to the next stage cooling device (not shown).

〔Effect of the invention〕

As explained above, the present invention divides the conveyance chain into a front-stage conveyance chain and a rear-stage conveyance chain with respect to the running 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 conveying chain that conveys the printed circuit board from the preceding conveying chain to the succeeding conveying chain is inserted, and the front and rear ends of this central conveying chain are lowered separately with respect to the traveling direction of the printed circuit board. In order to raise the rods, the rods are connected to the guide rails of the central conveying 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 In order to move the sprockets backwards and forwards in the running direction of the printed circuit board, a second drive device was provided that included a rod attached to each sprocket and an air cylinder that moved the rod in and out. K, ,J=! '/ can be moved up or down to l;Itb at a position corresponding to the equipment required for the soldering process. Therefore, compared to conventional carrier-less soldering equipment in which the solder bath is moved downward by 100 degrees, the entire soldering equipment can be made smaller, reducing the labor and costs of manufacturing, installation, etc. Can be done.

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]

Figures 1 (a) and (b) are a side view and a front view showing an embodiment of the present invention, Figure 2 is a plan view showing the configuration of the conveying chain in Figure 1, and Figure 3 (a). . (b) and (C) show the main parts of Figure 2, and Figure 3 (
Figure 3 (a) is a side view, Figure 3 (b) is a side view, Figure 3 (C) is a sectional view taken along line I-I in Figure 3 (a), and Figure 4 shows the operation of the conveyor chain and printed circuit board. The explanatory diagram shown in FIG. 5 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 tank, 8 is a solder melt, 11 is a soldering rack, and 12 is a conveyor chain in the center.
13.52 is a holding claw, 14 is a guide rail, 15 is a sprocket, 16.41 is a drive gear, 17.42 is a drive shaft, 20 is a support plate, 21 is a screw rod, 22A, 22B are guide plates, 23 is a guide Axis, 24A, 24B are gears, 28
is a hinge, 29.54 is a rod, 31 is an outer cylinder, 35 is a cam, 36 is a camshaft, 37 is a bearing, 38 is a roller, 40 is a connecting plate, 43 is a roller chain, 44 is a motor, 47 is a first Drive device, 51A is a front conveyance chain, 51B is a rear conveyance chain, 53 is an air cylinder, 55 is a fixture,
Reference numeral 56 designates a subblock I., 57 a supplementary issue board, and 66 a second driving device.

Claims (1)

[Claims] In a soldering device in which a printed circuit board is held by holding claws of a conveyor chain provided on both sides and soldered in a soldering bath, the conveyor chain is connected to an earlier conveyor chain and a later conveyor chain in the running direction of the printed circuit board. and a central conveyance chain that conveys 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 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 installed on the guide rail of the central conveyance chain. A first drive device is provided, which includes cams connecting the rods through the central conveying chain and a motor for rotating the cams, respectively, for moving the rods up and down, and a motor for rotating the cams. Among the sprockets that run 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 soldering device characterized by comprising a second drive device including a rod attached to each of the sprockets and an air cylinder for moving the rod in and out.