JPH059189B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a printed circuit board conveying device that engages a printed circuit board in an engagement groove of a guide rail and sequentially and intermittently conveys the printed circuit board.

[Conventional technology]

FIG. 8 is a side sectional view showing an example of a conventional steam soldering device, in which 1 is a printed circuit board, 2 is a chip component, 3 is a solder paste applied in advance to the printed circuit board 1, and 4 is a vapor phase soldering device. , 5 is a storage tank, and 6 is a heat transfer liquid, of which Fluorinert (trade name of Sumitomo 3M Ltd.), which is a fluorine-based inert liquid, is used as an example. 6
a is the vapor of the heat transfer liquid 6, and the solder paste 3
has a temperature higher than the melting point of 7 is a heater,
8 is a heating liquid tank; 9 is an entrance for carrying the printed circuit board 1; 10 is an entry passage serving as a transport path for the printed circuit board 1; 10a is an inclined surface of the entry passage 10; 11 is an exit; 12 is the same. Reference numeral 12a denotes an inclined surface of the carry-out side passage 12, 13 a cooler, 14 a cover for recovering the steam 6a discharged from the carry-in port 9 and the carry-out port 11, and 15 the printed circuit board. This is a conveyance chain as a means for conveying 1. Furthermore, the conveyor chain 15 may be replaced by a belt conveyor. 1
6 is a sprocket of the conveyance chain 15, and in the case of a belt conveyor, a roller is used.

Since the conventional vapor phase soldering apparatus 4 is configured as described above, the printed circuit board 1 is engaged with the holding claws (not shown) of the conveyor chain 15 or placed on a belt conveyor and conveyed. , heater 7
After the solder paste 3 is melted by the vapor 6a of the heat transfer liquid 6 heated by the heat transfer liquid 6 and soldering is performed, the melted solder solidifies and the chip part 2 is fixed to the printed circuit board 1 and carried out. Further, the steam 6a was cooled by the cooler 13 and recovered as a liquid.

[Problem that the invention seeks to solve]

By the way, in the conventional vapor phase soldering device 4, the vapor 6a is cooled to become a liquid heat transfer liquid 6, and then transferred to a conveyor chain (or belt conveyor) 15.
Attach to. Therefore, as the conveyance chain 15 runs, the heat transfer liquid 6 is discharged from the outlet 11 to the outside of the vapor phase soldering apparatus 4, making it impossible to recover it. Therefore, there is a problem that the expensive heat transfer liquid 6 is consumed a lot, which is uneconomical and increases the product cost.

This invention was made to solve the above problems, and by providing a guide rail in the conveyance path that engages and conveys the printed circuit board, the heat transfer liquid is discharged to the outside of the vapor phase soldering apparatus. An object of the present invention is to provide a printed circuit board conveyance device that prevents the occurrence of

[Means for solving problems]

The printed circuit board conveyance device according to the present invention includes:
A guide rail provided with an engagement groove for engaging the printed circuit board along the conveyance path of the printed circuit board, an elongated shaft body provided parallel to the guide rail, and a shaft body arranged at predetermined intervals in the longitudinal direction of the shaft body. A plurality of engaging pieces are fixed in series to transport the printed circuit board, and the shaft body is reciprocated by a predetermined distance in the longitudinal direction, and also rotates forward and backward by a predetermined angle in the circumferential direction around the axis of the shaft body. The device is equipped with a driving means that engages and disengages the printed circuit board from the engagement piece by rotating it, thereby sequentially and intermittently conveying the printed circuit board.

[Effect]

In this invention, since the printed circuit board is engaged with the engagement groove of the guide rail provided in the conveyance path and conveyed, the heat transfer liquid adhering to the engagement groove is conveyed without being discharged to the outside. It is dripped into the channel and returned to the heated liquid tank where it is collected.

〔Example〕

FIG. 1 is a side sectional view schematically showing an embodiment of the present invention, FIG. 2 is a plan view showing an enlarged main part of FIG. 1, and FIG. 3 is a side sectional view taken along the - line in FIG. ,
Fig. 4 is a view seen from the printed circuit board exit side in Fig. 2, Fig. 5 is a side view showing a further enlarged part of the printed circuit board delivery device, and Fig. 6 is a cross section taken along the - line in Fig. 5. 7 are side views showing details of the guide rail. In these figures, the same reference numerals as in FIG. 8 indicate the same parts, 1a indicates the front end of the printed circuit board 1 in the transport direction (direction of arrow A), and 1b indicates the rear end. 21 shows the entire vapor phase soldering device. 22 is the printed circuit board 1
Fixed side and movable side guide rails for transporting
24 is a wheel provided to place the printed circuit board 1 in the engagement groove 23 and transport it smoothly; 25 is a wheel provided to engage the fixed side guide rail 22; Fixed base attached, 26
27 is a rotatable screw rod to which the movable bearing 26 is screwed to set the holding width of the printed circuit board 1; 28 is a rotatable screw rod to which the fixed base 25 is fixed; Movable bearing 2
6 and a fixed shaft slidably fitted together; 29 a handle for rotating the screw rod 27; 30 a sprocket fixed to the screw rod 27; 31 a printed circuit board 1 engaged with the guide rail 22; This is a printed circuit board feeding device that feeds out printed circuit boards intermittently, and its details are shown in FIGS. 5 and 6. 32 is a pedestal of the printed circuit board feeding device 31; 33 is a screw rod for moving the pedestal 32 in a direction perpendicular to the conveyance direction (arrow A direction) of the printed circuit board 1 according to the holding width of the printed circuit board 1; 34, 35; is the screw rod 3
3 is a sprocket fixed to the sprocket; 36 is a roller chain connecting the sprockets 30 and 34;
37 is a board of the printed circuit board feeding device 31, 38 is a connecting plate that connects and fixes the base 32 and the board 37, and 39 is a long shaft whose axial direction extends toward the guide rail 22 and the printed circuit board. 1
It is provided parallel to the conveyance direction (direction of arrow A). 40 is a cylinder provided on the outer periphery of the shaft body 39;
Figure 5 shows the details. As shown in FIG. 6, the shaft 39 is designed so that the ridgeline of the shaft 39 does not come into contact with the inner circumference of the cylinder 40. 41 is the cylinder 40
Flanges 42 formed at both ends of the cylinder 4
A notch formed in the longitudinal direction of the shaft body 39 allows an engagement piece 46 (described later) to pass therethrough by movement of the shaft body 39. 43 is a bearing fixed to the flange 41 of the cylinder 40; 44 is a wheel provided on the bearing 43 and runs on the shaft body 39; 45 is a wheel attached to the pedestal 32 and runs on the outer periphery of the cylinder 40. A plurality of engaging pieces 46 are attached to the shaft body 39 in series at predetermined intervals (pitch P), and when engaged, push the rear end portion 1b of the printed circuit board 1 and transport it. 47 is a connecting plate attached to the end of the shaft body 39;
8 is a bearing fixed to the connecting plate 47, and 49 is a shaft that is fitted into the bearing 48 and freely slides in the axial direction. The connecting plate 47, the bearing 48, and the shaft 49 form a connecting means for connecting the shaft body 39 and the substrate 37. 50 is a bearing rotatably attached to one end of the shaft 49, and 51 is a roller chain to which the bearing 50 is attached. 52 is a sprocket, 52A is a driving sprocket, and 52B, 52C, and 52D are driven sprockets. 53 is a motor attached to the base plate 37 and serves as a driving means for driving the roller chain 51; 54 is a truck; 55 is a wheel of the truck 54; 56 is a guide rail on which the truck 54 runs; 57 is the base plate 37 and the truck A connecting rod 58 is a roller chain.

In the printed circuit board feeding device 3 configured as described above, first, the handle 29 is turned to rotate the screw rod 27 and the movable bearing 26 is moved to adjust the guide rail 22 to the holding width of the printed circuit board 1.
Furthermore, since the sprocket 30 of the screw rod 27 also rotates, the screw rod 33 rotates via the roller chain 36 and sprocket 34, and the base 32 and the base plate 37 are rotated.
moves simultaneously with the movable bearing 26.

Further, due to the rotation of the sprocket 35, the loading side passage 1 shown in FIG. 1 is opened via the roller chain 58.
0 and the respective movable bearings 26 (four in FIG. 1) provided in the discharge side passage 12 are moved simultaneously.

Next, when the bearing 50 is in the position of the driving sprocket 52A as shown in FIG.
3 and causes the roller chain 51 to travel clockwise, the bearing 50 travels in the direction of arrow A.
Then, connect motor 5 at sprocket 52B.
3 is stopped, the engaging piece 46 moves by one pitch P in the direction of arrow A.

At this time, the tip end 1a of the printed circuit board 1 is inserted into the engagement groove 23 of the guide rail 22 on the side of the loading port 9 and abuts against the engaging piece 46 on the side of the loading port 9. Next, the motor 53 is driven again, and the roller chain 5
1 is run clockwise, the bearing 50 descends from the sprocket 52B position, and the bearing 50 moves down from the sprocket 52B position.
It will be in position C. At this time, as shown in FIG. 4, the engaging piece 46, the connecting plate 47, the bearing 48, and the shaft 49 rotate clockwise around the shaft body 39, with the bearing 48 sliding on the shaft 49, and the solid line The engagement piece 46 moves away from the position where it engages the printed circuit board 1 from the position indicated by the two-dot chain line. Then,
Since the roller chain 51 moves further, the bearing 5
0 moves in the direction opposite to the direction of the arrow A and reaches the position of the sprocket 52D as shown in FIG. Next, the bearing 50 is attached to the sprocket 5.
When the engaging piece 46 rises from the position 2D and reaches the position of the sprocket 52A, the engaging piece 46 rotates counterclockwise as shown in FIG. 4, so that it engages with the rear end 1b of the printed circuit board 1. Next, as the bearing 50 moves from the sprocket 52A in the direction of arrow A in the same manner as described above, the engaging piece 46 pushes the rear end portion 1b of the printed circuit board 1 and transports the printed circuit board 1 in the direction of arrow A. By repeating the above operations, the printed circuit boards 1 are inserted one after another, and the pitch P
It is transported intermittently. The printed circuit board 1 that has been soldered is then taken out from the outlet 11.

Further, the vapor 6a of the heat transfer liquid 6 enters the engagement groove 23 and is cooled and liquefied, but in this invention, the printed circuit board 1 runs on the wheels 24 of the guide rail 22 and the wheels 24 rotate. As shown in FIG. 7, the heat transfer liquid 6 becomes liquid in the engagement groove 23.
The liquid drips through the gap 22a between the guide rail 22 and the wheel 24 into each of the passages 10 and 12 as shown by arrow B, thereby draining the liquid. Next, heat transfer liquid 6
The water flows on the inclined surfaces 10a and 12a of each passage 10 and 12, enters the storage tank 5, and is collected.

〔Effect of the invention〕

As explained above, the present invention includes a guide rail provided with an engagement groove for engaging a printed circuit board along a conveyance path of the printed circuit board, an elongated shaft body provided parallel to the guide rail, and a long shaft body provided in parallel with the guide rail. A plurality of engaging pieces are fixed in series at predetermined intervals in the longitudinal direction of the shaft to allow the printed circuit board to be conveyed; By rotating the printed circuit board by a predetermined angle in the circumferential direction in the forward and reverse directions, the printed circuit board is engaged with and disengaged from the engagement piece, and the printed circuit board is sequentially and intermittently conveyed. Since the heat transfer liquid can be recovered without being discharged to the outside and there is almost no need to replenish expensive heat transfer liquid, it is economical and has the advantage of reducing the cost of the product.

[Brief explanation of drawings]

FIG. 1 is a side sectional view showing a schematic configuration of an embodiment of the present invention, FIG. 2 is a plan view showing an enlarged main part of FIG. 1, and FIG. 3 is a side view taken along the - line in FIG. 2. 4 is a view from the printed circuit board unloading port side in FIG. 2, FIG. 5 is a side view showing a further enlarged part of the printed circuit board feeding device, and FIG.
7 is a side view showing details of the guide rail, and FIG. 8 is a side view showing an example of a conventional vapor phase soldering apparatus. In the figure, 1 is a printed circuit board, 2 is a chip component, and 3
5 is a storage tank, 6 is a heat transfer liquid,
7 is a heater, 8 is a heating liquid tank, 10 is a carry-in side passage,
12 is a carry-out passage, 13 is a cooler, 21 is a vapor phase soldering device, 22 is a guide rail, 23 is an engagement groove, 24 is a wheel, 31 is a printed circuit board feeding device, 32 is a pedestal, 37 is a board, 38 is a connecting plate,
39 is a shaft body, 40 is a cylinder, 42 is a notch, 46 is an engaging piece, 47 is a connecting plate, 48 is a bearing, 49 is a shaft,
50 is a bearing, 51 is a roller chain, 52A, 5
2B, 52C, and 52D are sprockets, and 53 is a motor.

Claims (1)

[Claims] 1. A heating liquid tank that stores a heat transfer liquid having a boiling point higher than the melting point of the solder paste applied to the printed circuit board in advance, and melts the solder paste of the printed circuit board with the generated steam by heating the heat transfer liquid; Used in a vapor phase soldering device comprising an input side passage and an output side passage connected to the heating liquid tank and serving as a conveyance path for the printed circuit board, and a cooler provided above the heating liquid tank to cool the steam. The printed circuit board conveyance device comprises a guide rail provided with an engagement groove for engaging the printed circuit board along a conveyance path of the printed circuit board, and an elongated shaft body provided parallel to the guide rail. ,
A plurality of engaging pieces are fixed in series at predetermined intervals in the longitudinal direction of the shaft body to transport the printed circuit board; The printed circuit board is characterized by comprising: a driving means for sequentially and intermittently conveying the printed circuit board by engaging and disengaging the printed circuit board from the engagement piece by rotating the printed circuit board forward and backward by a predetermined angle in a circumferential direction around the center. Board transport device.