JPH024391B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a printed circuit board for a carrierless soldering device in which a conveyance chain is provided with holding claws that press and hold the printed circuit board upward, downward, and diagonally downward. This invention relates to a holding device.

[Conventional technology]

FIG. 5 is a front view showing an example of holding claws of a conventional carrierless soldering device, in which 1 is a printed circuit board, 2 is an electronic component, 3 is a lead wire, and 4 is a holding claw that holds the side edge of the printed circuit board 1. , 5 is an engagement groove of the holding claw 4, and 6 is a rod, the lower end of which is fixed to the holding claw 4, and the upper end thereof to the connecting portion 7a of the conveyance chain 7.

In this way, when holding the printed circuit board 1 in the engagement groove 5 of the holding claw 4, move the movable conveyance chain 7 in the width direction of the printed circuit board 1, that is, in the direction perpendicular to the running direction of the printed circuit board 1 (arrow A direction), and held the printed circuit board 1 only from the lateral direction (direction of arrows A and B).

For this reason, the printed circuit board 1 is not held down from above or below, so the holding state is unstable, and there is also a gap between the edge of the printed circuit board 1 and the bottom 5a of the engagement groove 5. In this case, since the printed circuit board 1 is placed on the holding claw 4,
The state in which the printed circuit board 1 was held had become even more unstable. Therefore, when soldering, there is a problem that the printed circuit board 1 may be displaced, resulting in poor soldering.

Therefore, the present inventor proposed a printed circuit board holding device for a carrierless soldering machine that solved the above problems (Utility Application No. 59-180813 (Utility Model Application No. 61).
-97364)).

6a and 6b are front views showing essential parts of the printed circuit board holding device of the carrierless soldering apparatus disclosed in the above-mentioned Utility Model Application No. 59-180813, and the same reference numerals as in FIG. 5 indicate the same parts. First, in FIG. 6a, 11 is a first holding claw, 12 is a claw portion formed on the first holding claw 11 and rests the side edge of the printed circuit board 1, and 13 is a rod whose lower end is It is fixed integrally with the first holding claw 11, and the intermediate part is fitted to the connecting part 7a of the conveyance chain 7 so as to be movable up and down. Furthermore, a threaded part is formed in the upper part, and the cap nut 14 is screwed into the middle part. are combined. A compression spring 15 is fitted between the connecting portion 7a of the conveyance chain 7 and the cap nut 14, and urges the first holding claw 11 to be held in the upper position. Further, t indicates the thickness of the printed circuit board 1. In FIG. 6b, 21 is a second holding claw, and 22 is an inclined surface formed on the side of the second holding claw 21 that holds the printed circuit board 1, as shown by arrows C and D. It is formed to press diagonally downward. 23 is a rod, the lower end of which is fixed integrally with the second holding claw 21, the middle part of which is inserted into the connecting part 7a of the conveyance chain 7, and the upper part of which is formed with a threaded part. 7
It is fixed to the connecting part 7a of.

FIG. 7 is a side view showing the arrangement of the holding claws 11 and 21 shown in FIGS. 6a and 6b, in which the first holding claws 11 and the second holding claws 21 are arranged alternately.

Figures 8a, b, and c show the main parts of the soldering device. Figure 8a is a plan view, Figure 8b is a sectional view taken along the - line of Figure 8a, and Figure 8c is a cross-sectional view of the soldering device. Figure 8a
FIG. In these figures, the same reference numerals as in FIGS. 6a and 6b indicate the same parts, 31 is a chain cover, 31a is a guide piece that guides the conveyance chain 7, 32 is a sprocket of the conveyance chain 7, and 33 is the sprocket. 3
2 is a bolt for mounting, 34 is a nut for fixing the bolt 33, 35 is a collar, 36 is a rotating plate,
It serves as a driving means for pushing down the first holding pawl 11 when the conveyance chain 7 engages with the sprocket 32, and is fixed integrally with the sprocket 32. Reference numeral 37 denotes an inclined surface formed below the circumferential portion of the rotating plate 36, with which the top of the cap nut 14 of the first holding claw 11 engages. A slide plate 38 determines the position of the sprocket 32, and the sprocket 32 and the rotary plate 36 are attached to each other by bolts 33 and nuts 34. Reference numeral 39 denotes an engagement plate, which is formed at one end of the slide plate 38 and is in contact with an adjustment bolt 40 for strengthening or weakening the tension of the conveying chain 7. Reference numeral 41 denotes a holder that holds the bolt 40 by threading, and 42 a long hole that allows the slide plate 38 to move together with the bolt 33, which is formed in the chain cover 31. 43 is a long hole formed in the slide plate 38 to guide the movement of the slide plate 38; 44 is a pin engaged with the long hole 43;
is attached to.

FIG. 9 is an explanatory diagram showing the mode of operation of each holding claw 11, 21 when the conveyance chain 7 engages with and disengages from the sprocket 32. In order to prevent it from coming into contact with the holding claw 11, the inner part of the rotation is cut out to form a notch 21a.

Next, the operation will be explained.

In FIG. 9, when the conveyance chain 7 travels in the direction of arrow _E1 , the cap nut 14 of the first holding claw 11
The top of the is a rotary plate 3 rotating in the _two directions of arrow E.
It engages with the inclined surface 37 of No. 6. Next, the rotating plate 36
Due to the rotation, the top of the cap nut 14 is pushed down by the inclined surface 37 and presses the compression spring 15. Therefore, the first holding claw 11 is lowered to the position indicated by the two-dot chain line in FIG. 6a and the position shown in FIG. 8b.
At this time, when the printed circuit board 1 is inserted in the direction of arrow _E3 , the side edge of the printed circuit board 1 will be inserted into the first holding claw 1.
It is placed on the claw part 12 of 1. At this time, the second holding claw 21 does not move in the vertical direction, so it does not engage with the printed circuit board 1. Next, when the conveyance chain 7 further travels and the top of the cap nut 14 separates from the inclined surface 37, the pressure on the cap nut 14 is released and the first holding claw 11 is raised by the restoring force of the compression spring 15. Return to original position. At the same time, the printed circuit board 1 also rises and engages with the inclined surface 22 of the second holding claw 21. For this reason, printed circuit board 1
are pressed vertically and laterally by the upward pressing force of the compression spring 15 of the first holding claw 11 and the inclined surface 22 of the second holding claw 21, so that the printed circuit board 1 is pressed against each holding claw 11. , 12.

In addition, in FIGS. 8a and 8b, in order to strengthen the tension of the conveyor chain 7, push the engagement plate 39 by rotating the bolt 40 on the chain cover 31 and move the slide plate 38 in the direction of arrow F. Therefore, the sprocket 3 can be connected via the bolt 33.
2 also moves in the same direction, so the conveyance chain 7 is strongly stretched. Furthermore, in order to loosen the tension on the conveyor chain 7, it is sufficient to turn the bolt 40 in the opposite direction to that described above, and as a result, the slide plate 38 slides due to the restoring force of the conveyor chain 7 which is stretched, and the sprocket 32 is moved. It moves in the direction opposite to the direction of arrow F, and the tension of the conveyor chain 7 is loosened.

[Problem that the invention seeks to solve]

By the way, the printed circuit board holding device in the carrierless soldering device shown in Utility Application No. 59-180813 proposed earlier is such that the upper surface of the printed circuit board 1 is
Since the lower surface 1a of the printed circuit board 1 comes into contact with the inclined surface 22 of the holding claw 21, the level of the lower surface 1a of the printed circuit board 1 changes depending on the thickness t of the printed circuit board 1. That is, as the thickness t of the printed circuit board 1 increases, the level of the lower surface 1a decreases, and as the thickness t of the printed circuit board 1 decreases, it increases. Therefore, with respect to the level of the lower surface 1a of the printed circuit board 1, the level of the solder melt surface in the solder tank (not shown) and the cutting level at which the lead wire 3 is cut by the cutter device change and are not constant, so it is necessary to adjust the level. There was a problem that required a lot of work.

Further, as shown in FIG. 9, if the insertion speed of the printed circuit board 1 in the direction of arrow _E3 is faster than the traveling speed of the conveyance chain 7, the front of the printed circuit board 1 has already separated from the inclined surface 37 of the rotary plate 36. The rear part of the printed circuit board 1 is located on the lower surface of the claw part 12 of the first holding claw 11 that is rising and does not engage with the first holding claw 11. is placed on the top surface of the For this reason, the printed circuit board 1 is not engaged in a positive state, resulting in problems such as the printed circuit board 1 falling off, being bent, and being damaged, and defective products being produced.

This invention was made to solve the above problem, and the bottom surface of the printed circuit board is held at a constant level by placing the bottom surface of the printed circuit board on a fixed holding claw. be.

[Means for solving problems]

The printed circuit board holding device in the carrierless soldering apparatus according to the present invention is provided with a first holding claw for placing the side edge of the printed circuit board on the lower end of the rod fixed to the connecting section of the conveying chain. A rod is provided so as to be movable up and down relative to the printed circuit board and always positioned below, and when the rod movable up and down is lowered relative to the printed circuit board placed on the first holding claw, the printed circuit board is moved upwardly and downwardly. A second holding claw that presses the substrate from above to below is provided at the lower end of the vertically movable rod, and the first holding claw and second holding claw are provided alternately at the connecting portion of the transfer chain. , further provided with a guide piece for lowering and raising the rod having the second holding claw fixed to the lower end, and further provided with rotation means for holding the second holding claw in the raised position and rotating in the circumferential direction. It is something that

[Effect]

In this invention, when the second holding pawl comes to the position where the printed circuit board is mounted due to the movement of the conveyance chain, the drive device is actuated to pull up the rod and raise the second holding pawl. Next, after placing the printed circuit board on the first holding claw, the rod is removed from the drive device, so the second holding claw is lowered.
The second holding claw presses the printed circuit board from above to below.

〔Example〕

1A and 1B are front views of essential parts showing an embodiment of the present invention, and the same reference numerals as in FIG. 5 indicate the same parts. First, in FIG. 1a, 51 is a first holding claw, 52 is a claw portion formed on the first holding claw 51 and rests the side edge of the printed circuit board 1, and 53 is a rod, the lower end of which is It is fixed integrally with the first holding claw 51, and the intermediate part is fitted into the connecting part 7a of the conveyance chain 7. Furthermore, a threaded part is formed in the upper part and is screwed into the nut 54. In FIG. 1b, reference numeral 61 denotes the holding claw shown in FIG. 2, and 62 a pressing surface formed on the lower surface of the second holding claw 61, which is formed to press the printed circuit board 1 downward. Reference numeral 63 denotes a rod, the lower end of which is fixed integrally with the second holding claw 61, and the intermediate portion inserted through the connecting portion 7a of the conveyance chain 7 so as to be movable up and down. Reference numeral 64 is an engaging body provided to pull up the second holding claw 61 and fixed integrally with the rod 63;
The second holding claw 61 is held downward by a compression spring fitted between the holding claw 61 and the connecting portion 7a of the conveyance chain 7. Engagement body 64
A thread is formed on the upper part of the engaging body 6 with a nut 65.
4 is fixed.

FIG. 2 is a side view showing the arrangement of the holding claws 51 and 61 shown in FIGS. 1a and 1b, and the first holding claws 51 and the second holding claws 61 are arranged alternately.

Figures 3a, b, c, d, and e show the main parts of the soldering device, with Figure 3a being a plan view and Figure 3b being a top view.
is a cross-sectional view taken along the - line in Figure 3 a, Figure 3 c is a cross-sectional view taken along the - line in Figure 3 a, Figure 3 d is a cross-sectional view taken along the - line in Figure 3 a, and Figure 3 e is a cross-sectional view taken along the - line in Figure 3 a. 3
FIG. 3 is a sectional view taken along the - line in FIG. In these figures, the same reference numerals as in FIGS. 1a, b, 8a-c, and 9 indicate the same parts, 71 is a chain guide, 72 is a chain cover, and 73 is a guide piece of the chain cover 71. , 74 are rotating plates, which serve as rotating means for holding and rotating the second holding pawl 61 in the raised position in the circumferential direction when the conveyance chain 7 engages with the sprocket 32.
2 are fixed together. 75 is the rotating plate 7
The second engagement part is formed below the circumferential part of
The holding claw 61 engages with the inclined surface 64a of the engaging body 64. 76 is the engaging body 64 of the second holding claw 61
This is an inner guide piece that raises the second holding claw 61 while engaging with the chain guide 71, and is formed in a long shape and attached to the chain guide 71. Reference numeral 76a denotes a sloped portion formed on the upper surface of the guide piece 76, which is formed in order to pull up the second holding claw 61 and engage it with the engaging portion 75 of the rotary plate 74. Reference numeral 77 denotes an outer guide piece, which is fixed to the chain cover 72. Further, the outer guide piece 77 is also formed with a sloped portion 77a at a position corresponding to the inner guide piece 76. Reference numeral 77b denotes a projecting portion formed on the side surface of the guide piece 77 for guiding the second holding claw 61 to the engaging body 75 of the rotary plate 74 and engaging it therein.

FIG. 4 is an explanatory diagram showing the mode of operation of each holding claw 51, 61 when the conveyance chain 7 engages with and disengages from the sprocket 32. In order to prevent it from coming into contact with the holding claw 51, the inner part of the rotation is cut out to form a notch 61a.

Next, the operation will be explained.

In FIG. 4, when the conveyance chain 7 travels in the direction of arrow _E1 , the engaging body 64 of the second holding claw 61 engages with each guide piece 76, 77, and at the same time, the inclined surface 64a of the engaging body 64 moves with each guide piece. 76, 77 on the slope portions 76a, 77a, and
By pulling up the first rod 63 and pressing the compression spring 66, the second retaining pawl 61 is placed in the position indicated by the two-dot chain line in FIG. 1b and in the position shown in FIG. 3b. Next, the engaging portion 7 of the rotary plate 74 runs horizontally on each of the guide pieces 76 and 77, and is guided by the protruding portion 77b of the outer guide piece 77 and rotates in the direction of arrow _E2 .
5. At this time, mark the printed circuit board 1 with the arrow
When inserted in the _E2 direction, the side edges of the printed circuit board 1 are placed on the claw portions 52 of the first holding claws 51. At this time, since the second holding claw 61 is pulled upward, it does not engage with the printed circuit board 1.
Next, the conveyance chain 7 further travels, and the engaging body 64 of the second holding claw 61 engages the engaging portion 75 of the rotary plate 74.
After it comes off, it engages with each guide piece 76, 77,
The second holding claw 61 is held in the raised position. Next, the engaging body 64 engages each guide piece 76, 77.
When the engaging body 64 is disengaged after descending the slope portions 76a and 77a, the compression spring 15
The restoring force causes the second holding claw 61 to rise and return to its original position. Therefore, the printed circuit board 1 is pressed downward by the downward pressing force of the compression spring 66 of the second holding claw 61, so that the printed circuit board 1 is securely held by each of the holding claws 51, 61. Ru.

〔Effect of the invention〕

As explained above, the present invention provides a first holding claw for placing the side edge of the printed circuit board on the lower end of the rod fixed to the connecting part of the conveying chain, and is movable up and down with respect to the connecting part of the conveying chain. A rod is provided so that the rod is always positioned downward, and when the vertically movable rod is lowered, the printed circuit board is directed downward from above with respect to the printed circuit board placed on the first holding claw. A second holding pawl for pressing is provided at the lower end of the vertically movable rod, and the first holding pawl and the second holding pawl are alternately provided at the connecting portion of the conveying chain, and A guide is provided to lower and raise the rod with the second holding claw fixed to the lower end, and a rotating means is provided to hold the second holding claw in the raised position and rotate it in the circumferential direction. The printed circuit board is automatically held from both the horizontal and vertical directions, and the mounting of the printed circuit board is ensured.The printed circuit board does not shift or move during the soldering process, and the printed circuit board is fixed. Since the soldering surface and the cutting surface of the printed circuit board are placed on the first holding claw that has a fixed solder melt level and the cutting level even if the thickness of the printed circuit board changes, level is maintained. Furthermore, even if the insertion speed of the printed circuit board becomes faster than the traveling speed of the conveyance chain, since the printed circuit board advances at the point where the second holding claw is pulled up, there is no problem with engagement by the second holding claw, etc. It has the following advantages.

[Brief explanation of drawings]

Figures 1a and b are front views of essential parts showing one embodiment of the present invention, Figure 2 is a side view showing the arrangement of the holding claws in Figures 1a and b, Figures 3a, b, c, d and e show the main parts of a soldering device in an embodiment of the present invention, FIG. 3a is a plan view, and FIG. 3b is a third
Figure 3c is a sectional view taken along the - line in Figure 3a, Figure 3d is a sectional view taken in Figure 3a.
3e is a sectional view taken along the - line in FIG. FIGS. 6a and 6b are front views showing an example of holding claws of a soldering device; FIGS. The figure is a side view showing the arrangement of the holding claws in Figures 6a and b, and
Figures a, b, and c show the main parts of a soldering device according to an embodiment of the present invention. FIG. 8c is a sectional view taken along the - line in FIG. 8a, and FIG. 9 is an explanatory diagram showing the mode of the holding claws in FIGS. 6a and 6b. In the figure, 1 is a printed circuit board, 7 is a conveyance chain, 7
a is a connecting portion, 51 is a first holding claw, 52 is a claw portion,
53, 63 are rods, 61 is a second holding claw, 62
is a pressing surface, 64 is an engaging body, 66 is a compression spring, 74
75 is a rotating plate, 75 is an engaging portion, 76 and 77 are guide pieces, 76a and 77a are sloped portions, and 77b is a projecting portion.

Claims (1)

[Claims] 1. In a carrier-less soldering device that performs soldering processing while a printed circuit board is removably held in a holding claw of a conveyance chain while running, a side edge of the printed circuit board is attached to the lower end of a rod fixed to a connecting portion of the conveyance chain. A rod is provided so as to be movable up and down with respect to the connecting portion of the conveyance chain and always positioned downward, and the rod is placed on the first holding pawl. a second holding claw is provided at the lower end of the vertically movable rod for pressing the printed circuit board from above to below when the vertically movable rod descends; The first holding claws and the second holding claws are provided alternately at the connecting portion of the conveyance chain, and further a guide piece is provided for lowering and raising the rod having the second holding claws fixed to the lower end thereof. What is claimed is: 1. A printed circuit board holding device for a carrier-less soldering apparatus, further comprising a rotating means for holding said second holding claw in a raised position and rotating it in a circumferential direction.