JPH0513028B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a printed circuit board in a carrier-less soldering device that is capable of transporting a printed circuit board engaged with holding claws of a transport chain while holding the printed circuit board at a constant level. This invention relates to a holding device.

[Conventional technology]

5, 6a and 6b show an example of a printed circuit board holding device in a conventional carrierless soldering device, FIG. 5 is a side view, and FIG. 6a is a sectional view taken along the - line in FIG. 5. , FIG. 6b is a sectional view taken along the - line in FIG. 5. In these figures, 1 is a printed circuit board, 2 is an electronic component, 3 is a lead wire of the electronic component 2, 4 is a conveyance chain for conveying the printed circuit board 1, 4a is one connection part of the conveyance chain 4, and 5 is the first holding claw, the details of which are shown in FIG. 6a. Reference numeral 6 denotes a claw portion formed on the first holding claw 5 and on which the side edge of the printed circuit board 1 is placed, and 7 is a first rod, the lower end of which is fixed integrally with the first holding claw 5. At the same time, the intermediate part is fitted into one connecting part 4a of the conveyance chain 4,
Further, the upper portion is screwed into a nut 8 having a threaded portion. Reference numeral 9 denotes a chain guide for guiding the conveyance chain 4.

In FIG. 5, reference numeral 11 denotes second holding claws, which are arranged alternately with the first holding claws 5 in the running direction of the conveyance chain 4, the details of which are shown in FIG. 6b. Reference numeral 12 denotes a pressing surface formed on the lower surface of the second holding claw 11, which is formed so as to press the printed circuit board 1 downward. 13 is the second rod,
Its lower end portion is integrally fixed to the second holding claw 11, and its intermediate portion is inserted through the other connecting portion 4b of the conveyance chain 4 so as to be vertically movable.
Reference numeral 14 denotes an engaging body provided to pull up the second holding claw 11, and 14a indicates an inclined surface 15, which is a spring fitted between the second holding claw 11 and the connecting portion 4b of the conveyance chain 4. , second holding claw 11
It is provided so as to bias downward. The upper part of the second rod 13 is threaded and the nut 16
The engaging body 14 is fixed by screwing.

In this way, the printed circuit board 1 is held by the first holding claw 5.
The spring 1 of the second holding claw 11 is placed on the claw portion 6 of the
Because it is pressed by the downward pressing force of 5,
The printed circuit board 1 is securely held by the respective holding claws 5 and 11.

[Problem that the invention seeks to solve]

By the way, in the conventional printed circuit board holding device as described above, a gap is provided between the conveyance chain 4 and the chain guide 9 in order to make the conveyance chain 4 run smoothly, but the dimensional accuracy of the conveyance chain 4 and Due to the difference in dimensional accuracy with the chain guide 9, the gap may become large. For this reason,
When the traveling conveyance chain 4 changes up and down, the traveling level of the conveying chain 4 also changes in the vertical direction, so the traveling level of the printed circuit board 1 also changes in the vertical direction according to the conveying chain 4, so that the running level remains constant. There was a problem that the level could not be obtained.

In this way, if the soldering surface of the printed circuit board 1 cannot always be maintained at a constant level with respect to the level of the solder melt flowing from the solder bath and the cutting level of the cutter device,
There were problems in that the solder melt adhered unevenly in the solder bath, and that the lead wire 3 could not be cut to the exact length with the cutter device.

This invention was made in order to solve the above problems, and even if the level of the traveling conveyance chain changes, the running level of the printed circuit board does not change and can always be maintained at a constant level. The object of the present invention is to obtain a printed circuit board holding device for a carrier-less soldering device.

[Means for solving problems]

A printed circuit board holding device in a carrierless soldering apparatus according to the present invention includes a first rod that is vertically movably inserted into one connecting portion of a conveyance chain that travels while being engaged with a chain guide.
A first holding claw for placing the side edge of the printed circuit board is fixed to the lower end of the first rod, and a second rod is inserted into the other connecting portion of the conveyance chain so as to be movable up and down. A second holding claw that presses the printed circuit board placed on the holding claw from above is provided at the lower end of the second rod, and the first holding claw and the second holding claw are aligned in the running direction of the conveyance chain. The chain guide is provided alternately with protrusions that serve as the reference level for the printed circuit board, and protrudes inward from the chain guide, and furthermore, an engaging plate is provided to keep the printed circuit board at a constant level and allow it to travel. It is fixed integrally with the first rod, and the engagement plate is placed on the protrusion.

[Effect]

In this invention, after the printed circuit board is placed on the first holding claw, the printed circuit board is mounted on the conveyance chain and fixed to the first rod by pressing the printed circuit board with the second holding claw. The engagement plate is placed on the protrusion of the chain guide, and one connecting portion of the conveyance chain is inserted through the first holding pawl so that it can move up and down. The printed circuit board always maintains a constant level even when moving up and down.

〔Example〕

FIGS. 1a and 1b are front views showing an embodiment of the present invention. In these figures, the same reference numerals as in FIGS. 6a and 6b indicate the same parts, and the first holding claw 5 shown in FIG. 1a and the second holding claw 11 shown in FIG. 1b are different from conventional ones. As in the example shown in Fig. 5, conveyor chain 2
They are arranged alternately with respect to one running direction. 2
1a One connection part of the conveyance chain 21, 21
b is the other connecting portion of the conveyance chain 21, 22
is a first rod, which is fixed integrally with the first holding claw 5, and whose intermediate portion is fitted to one connecting portion 21a of the conveyance chain 21 so as to be vertically movable;
Furthermore, a threaded portion is formed at the upper portion and is screwed into the nut 8. 23 is a chain guide for guiding the conveyance chain 21; 23a is a protrusion serving as a reference level for the printed circuit board 1; the chain guide 23 is provided so as to protrude inward; Reference numeral 24 denotes an engagement plate that is fixed integrally with the first rod 22, and is placed on the protrusion 23a that protrudes inwardly of the chain guide 23, so that the printed circuit board 1 is always held at a constant level while traveling. It is something. 25 is a color.

In addition, in FIG. 1b, the second rod 13 is inserted through the other connecting portion 21b of the conveyance chain 21 so as to be able to move up and down. .

Next, the operation will be explained.

The operation of the printed circuit board holding device shown in the embodiment shown in FIGS. 1a and 1b is almost the same as the conventional example shown in FIGS. Engagement plate 24 fixed to first rod 22
The weight of the printed circuit board 1, the first holding claw 5, the first rod 22, etc. keeps the printed circuit board 1 placed on the protrusion 23a, which is the reference level of the printed circuit board 1. It is movable up and down with respect to the rod 22. Therefore, as shown in FIG.
4 is held constant. FIG. 3 is a front view showing another embodiment of the present invention, in which the same reference numerals in FIG. 1 indicate the same parts, 31 is a first holding claw, 32
33 is a collar portion integrally formed with the first holding claw 31; 34 is the first holding claw 3;
1. An engaging portion formed integrally with the collar portion 33.

The operation is the same as the embodiment shown in FIG. Note that FIG. 4 shows a state in which the conveyance chain 21 of FIG. 3 has been moved upward.

Therefore, even in the other embodiments shown in FIGS. 3 and 4, the running level of the printed circuit board 1 is maintained constant even if the conveyance chain 21 moves upward.

〔Effect of the invention〕

As explained above, the present invention has a first rod that is vertically movably inserted into one connecting portion of a conveyance chain that travels while being engaged with a chain guide.
A first holding claw for placing the side edge of the printed circuit board is fixed to the lower end of the first rod, and a second rod is inserted into the other connecting portion of the conveyance chain so as to be movable up and down. A second holding claw that presses the printed circuit board placed on the holding claw from above is provided at the lower end of the second rod, and the first holding claw and the second holding claw are aligned in the running direction of the conveyance chain. The chain guide is provided alternately with protrusions that serve as the reference level for the printed circuit board, and protrudes inward from the chain guide, and furthermore, an engaging plate is provided to keep the printed circuit board at a constant level and allow it to travel. Since it is fixed integrally with the first rod and the engagement plate is placed on the protrusion, even if the level of the traveling conveyance chain changes in the vertical direction, the running level of the printed circuit board does not change and is always at a constant level. can be maintained. Therefore, in the solder bath, adhesion of solder melt and
In addition, the cutter device has the advantage of being able to cut lead wires to uniform lengths, resulting in a printed circuit board of good quality.

[Brief explanation of drawings]

Figures 1a and b are front views showing one embodiment of the invention, Figure 2 is a diagram showing the state after the conveyance chain in Figure 1a has moved, and Figure 3 is another embodiment of the invention. FIG. 4 is a diagram showing the state after the conveyance chain in FIG. 3 has moved. FIGS. 5 and 6 a and b show an example of a printed circuit board holding device in a conventional carrierless soldering machine. It shows,
5 is a side view, FIG. 6a is a sectional view taken along the - line in FIG. 5, and FIG. 6b is a sectional view taken along the - line in FIG. In the figure, 1 is a printed circuit board, 2 is an electronic component, 3 is a lead wire, 5 is a first holding claw, 11 is a second holding claw, 13 is a second rod, 21 is a conveyance chain,
21a and 21b are connecting parts, 22 is a first rod,
23 is a chain guide, 23a is a protrusion, and 24 is an engagement plate.

Claims (1)

[Claims] 1. A first rod is vertically movably inserted into one connecting portion of a conveyance chain that travels while being engaged with a chain guide, and a side edge of a printed circuit board is placed on the lower end of this first rod. A second rod is inserted into the other connecting portion of the conveyance chain so as to be vertically movable, and presses the printed circuit board placed on the first holding claw from above. Holding claws are provided at the lower end of the second rod, and the first holding claws and the second holding claws are provided alternately with respect to the running direction of the conveyance chain. A protrusion serving as a reference level is provided to protrude inward of the chain guide, and furthermore, an engagement plate for keeping the printed circuit board at a constant level and traveling is fixed integrally with the first rod. A printed circuit board holding device in a carrierless soldering apparatus, characterized in that the engaging plate is placed on the protruding portion.