JPH069739B2 - Warpage correction device for printed circuit board in carrierless soldering machine - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a printed circuit board in a carrierless soldering apparatus that corrects a warp generated in the printed circuit board in a soldering process of the printed circuit board on which electronic components and the like are mounted. The present invention relates to a warp correction device.

[Conventional technology]

Conventionally, in a process of soldering a printed circuit board on which an electronic component having a lead wire is mounted, the printed circuit board is largely warped and deformed due to a thermal effect of a solder melt or the like.
Therefore, since the cutter device in the next stage cannot perform uniform cutting, a warp correction device for a printed circuit board as shown in FIG. 6 has been used.

FIG. 6 is a schematic configuration diagram showing a conventional lower warp compensator for a printed circuit board, where 1 is a printed circuit board, 1a is an edge portion of the printed circuit board 1 in the traveling direction, 2 is an electronic component, 3 is the electronic component. 2 lead wires, 4 is a transport chain that engages the printed circuit board 1 to run, 5 is a cutter, 6, 7
Are both lower warp correctors provided below the traveling printed circuit board 1 to correct the downward curving of the printed circuit board 1 from above the printed circuit board 1 to above. Note that FIG. 6 shows an example in which the lower warp correctors 6 and 7 are used in a cutter device. Further, the lower warp corrector 6 has pins 6b radially provided on the circumferential surface of the rotary shaft 6a, and 6c is a bearing for supporting the rotary shaft 6a. The lower warp compensator 7 has a rotary plate 7 on the rotary shaft 7a.
b is provided, and 7c is a bearing that supports the rotary shaft 7a.

[Problems to be Solved by the Invention]

As described above, in the conventional lower warp correctors 6 and 7 of the printed circuit board 1, since the central portion of the lower surface of the printed circuit board 1 is curved downward, the lower warp corrector 6 is brought into contact with the pin 6b of the lower warp corrector 6. The lower warp compensator 7 is brought into contact with the rotary plate 7b to perform the warp correction from below, but when the central portion of the printed circuit board 1 is curved upward, the correction cannot be performed, so that the printed circuit board 1 cannot be corrected. There is a problem that the warp is not completely corrected, and the lead wire 3 is not evenly cut due to the vibration caused by the rotation of the cutter 5, or the lead wire 3 is cut obliquely, so that a clean cut surface cannot be obtained. there were.

The present invention has been made to solve the above problems, and an object of the present invention is to correct the warp of the printed circuit board by pressing the upper surface of the printed circuit board with a pin that contacts the upper surface of the printed circuit board. In addition, in a carrierless soldering device that is configured to correct the warp of the printed circuit board by pressing the printed circuit board from both the upper surface and the lower surface and to prevent the vibration of the printed circuit board when the lead wire is cut by the cutter. An object is to obtain a warp correction device for a printed circuit board.

[Means for Solving the Problems]

A warp correction device for a printed circuit board in a carrierless soldering device according to the present invention includes a pin for pressing the upper surface of a traveling printed circuit board from above to a lower side, a movable plate with the pin attached, and a movable plate that can move up and down. An upper warp compensator composed of a drive device that moves up and down, a slide plate on which the upper warp compensator is mounted, and a slide base on which the slide plate is slidably attached in a direction orthogonal to the traveling direction of the printed circuit board, The slide base comprises a traveling device that reciprocates in parallel with the traveling direction of the printed circuit board.

Further, in order to correct the downward warp of the printed circuit board, a pressing tool composed of a pin or a rotating plate for pressing the lower surface of the printed circuit board from the lower side to the upper side, a rotary shaft equipped with this pressing tool, A lower warp compensator including a bearing supporting a rotating shaft is provided below a printed circuit board on which the lower warp compensator runs.

[Action]

In the present invention, when the drive device of the upper warp corrector is activated, the pins are lowered by the lowering of the movable plate to press the upper surface of the printed circuit board. Further, the slide base moves together with the printed circuit board by driving the traveling device.

Further, when the traveling printed circuit board comes into contact with the pressing tool of the lower warp corrector, the warp of the printed circuit board is corrected by the rotation of the pressing tool.

Further, by pressing the upper surface and the lower surface of the printed circuit board, vibration of the printed circuit board is prevented when the lead wire is cut by the cutter.

〔Example〕

FIGS. 1 to 4 show an embodiment of the present invention, and show an example in which it is used in a cutter device. FIG. 1 is a side view, and FIGS. 2 to 4 are all FIG. It is the front view, side view, and perspective view which expanded and showed the principal part. In these figures, the same reference numerals as those in FIG.
Reference numeral 1 is a soldering device, 12 is a holding claw for engaging and holding the printed circuit board 1, and 13 is a chain guide of the transport chain 4. Reference numeral 21 denotes an upper warp compensator for preventing the printed circuit board 1 from warping upward or for compensating the printed circuit board 1 warped upward, and 22 denotes a cylinder of the upper warp compensator 21, such as an air cylinder. used. Two
Reference numeral 3 denotes a rod of the cylinder 22, which has a piston which is not attached to the inside of the cylinder 22.
A drive device that reciprocates the rod 23 is configured by the rod 2 and the rod 23. 24 is a fixture integrally fixed to the upper end and the lower end of the rod 23, and 25 is a slide plate attached to the fixture 24.
In FIG. 4 and FIG. 4, it is shown in a mode in which the position shown by the solid line in FIG. 2 is moved to the vertical position shown by the chain double-dashed line. 26
Is a fixing screw of the slide plate 25, 27 is a support tool rotatably attached to the slide plate 25, 28 is a mounting screw of the support tool 27, and 29 is a vertical movement fixed to the support tool 27. Movable plate, 30 is a fixing screw of the movable plate 29, 31 is a base 31 to which the movable plate 29 is attached
Pins attached to the lower surface of the printed circuit board 1 on the upper surface,
Reference numeral 33 denotes a mounting screw mounted on the upper surface of the pedestal 31, which is slidably inserted into the long hole 29a of the movable plate 29, so that the pedestal 31 is located between the position shown by the solid line in FIG. 3 and the position shown by the chain double-dashed line. Can be set to any position. 34 is the pedestal 3
1 is a nut for fixing 1, 35 is a mounting bolt for attaching the upper warp compensator 21 to a slide plate 41 described later, and 36 is a pipe for alternately sucking and discharging air or the like for operating the rod 23. The movable plate 29 may be directly attached to the rod 23, and the pin 32 may be directly attached to the movable plate 29.

Reference numeral 42 denotes a slide base on which the slide plate 41 is slidably attached in a direction perpendicular to the traveling direction of the printed circuit board 1, and 43 denotes a slide base 42 on which the slide base 42 is placed.
Is a guide rail on which the carriage travels, 44 is a holding plate for mounting the slide plate 41 on the slide base 42, and 45 is the holding plate 4
4 is a fixing screw for fixing 4; 46 is a push screw for fixing the slide plate 41 after the slide plate 41 is set at a desired position; 47 is a mounting piece attached to the slide base;
Reference numeral 8 denotes an endless running chain that runs the slide base 42, and a part of the running chain is fixed to a mounting piece 47. 49
Is a motor that rotates in the forward and reverse directions to drive the traveling chain 48 in the forward direction of arrow A and in the opposite direction. The traveling chain 48 and the motor 49 form a traveling device.

Reference numeral 51 denotes an encoder for detecting the traveling speed of the printed circuit board 1, which is for synchronizing the traveling speed of the slide table 42 with the traveling speed of the printed circuit board 1. Reference numeral 52 detects that the front edge 1a of the printed circuit board 1 in the traveling direction (direction of arrow A) has traveled to the front pin 32, operates the upper warp compensator 21, and starts the motor 49. The first detector 53, 53 is the lead wire 3
Is detected and the slide base 42 is detected, and the second detector 54 for stopping the motor 29 and rotating it in the opposite direction detects that the slide base 42 has returned to the initial position. Is a third detector that stops the rotation of the motor 29.

Next, the operation will be described.

First, the push screw 46 is loosened and the slide plate 41 is slid to set the movable plate 29 at a predetermined position, then the nut 34 is loosened, the mounting screw 33 is moved, and the pin 32 is brought into contact with the predetermined position of the printed circuit board 1. Set to touch.

Next, the encoder 5 detects the traveling speed of the first printed circuit board 1 which is engaged with the holding claws 12 and has traveled in the direction of arrow A.
The motor 49 sets the rotation speed so that the slide base 42 travels at the same speed as the printed circuit board 1 as detected by the motor 1. Next, the front edge 1a of the printed circuit board 1 is the first
Simultaneously with the detection by the detector 52, the lower end of the pin 32 comes into contact with the upper surface of the printed board 1 by lowering the slide plate 41 to the position of the chain double-dashed line in FIG. The upper surface of the printed board 1 is pressed. Therefore, the warp of the printed circuit board 1 which is warped upward is corrected. Next, the upper warp corrector 21 is moved to the arrow A.
When the pin 6b of the lower warp corrector 6 contacts the printed circuit board 1 when it moves in the direction, the pin 6b rotates.
b is sequentially brought into contact with the printed circuit board 1 to correct the warp of the printed circuit board 1, and then the lead wire 3 is cut by the cutter 5. The printed circuit board 1 after the lead wire 3 is cut further abuts on the rotating plate 7b of the lower warp compensator 7, and the warp of the printed circuit board 1 is corrected by the rotation of the rotating plate 7b.

Next, after the load line 3 is cut, the slide base 42 is stopped by being detected by the second detector 53, and the rod 23 is actuated to move the pin 32 upward. Leave. However, the printed circuit board 1 continues to run in the direction of arrow A and is unloaded.

Next, when the slide base 42 is stopped, the motor 49 is rotated in the reverse direction to move the slide base 42 in the direction opposite to the arrow A direction. Next, when the slide base 42 returns to the initial position, the third detector 54 detects the slide base 42 and stops it.

Next, as shown in FIG. 5, the second running printed board 1 is initially soldered in the same operation as above by the other upper warp compensator 21 provided correspondingly, and then initially. Return to the position. When the slide base 42 returns, that is, when traveling in the direction opposite to the arrow A direction,
By increasing the reverse rotation speed of the motor 49 so as to return at a high speed, the third printed circuit board 1 can be dealt with immediately.

Since the warp corrector 21 is provided on both sides of the printed circuit board 1 of the soldering device 11 in the traveling direction as shown in FIG. 5, the slide plate 25 is set obliquely with the bin 32 facing downward. It is a thing. This is because when the upper warp correctors 21 on both sides run in opposite directions, the support 2
7 and the movable plate 29 are prevented from colliding with each other. Therefore, the slide plate 25 may be set in the vertical direction if it is provided only on one side, that is, on the right side or the left side in FIG.

〔The invention's effect〕

As described above, the present invention includes an upper portion including a pin that presses the upper surface of a traveling printed circuit board downward from above, a movable plate that is vertically movable, to which the pin is attached, and a drive device that vertically moves the movable plate. A warp compensator, a slide plate on which the upper warp compensator is mounted, a slide base on which the slide plate is slidably mounted in a direction perpendicular to the traveling direction of the printed circuit board, and this slide base is mounted in the traveling direction of the printed circuit board. Since it consists of a traveling device that reciprocates in parallel with, it is possible to correct the upward warp of the printed circuit board, and the leads after being soldered to the printed circuit board mounted with electronic components having lead wires When cutting the wire with a cutter device, the upper and lower surfaces of the printed circuit board are suppressed, so there is no vibration and the warp of the printed circuit board is accurately compensated. Is an advantage that enables highly accurate cutting.

[Brief description of drawings]

FIG. 1 is a side view showing an embodiment of the present invention, and FIGS. 2 to 4 are front views showing enlarged main parts of FIG.
FIG. 5 is a side view and a perspective view, FIG. 5 is a schematic front view showing an arrangement of an upper warp compensator, and FIG. 6 is a schematic configuration diagram showing a conventional lower warp compensator of a printed circuit board. In the figure, 1 is a printed circuit board, 2 is an electronic component, 3 is a lead wire, 4 is a transport chain, 5 is a cutter, 6 and 7 are lower warp correctors, 11 is a soldering device, 12 is a holding claw, and 13
Is a chain guide, 21 is an upper warp corrector, 22 is a cylinder, 23 is a rod, 25 is a slide plate, 27 is a support tool, 29 is a movable plate, 31 is a pedestal, 32 is a pin, 41 is a slide plate, and 42 is a slide. Table, 43 is a guide rail, 4
Reference numeral 8 is a traveling chain, and 49 is a motor.

Claims (1)

[Claims] 1. A carrierless soldering apparatus for running a printed circuit board placed on a holding claw of a transport chain to solder an electronic component and cutting a lead wire of the electronic component with a cutter. An upper warp compensator consisting of a pin for pressing the upper surface of the printed circuit board downward from above, a movable plate with the pin attached up and down, and a drive device for moving the movable plate up and down, and an upper warp compensator. A mounted slide plate, a slide base on which the slide plate is slidably attached in a direction perpendicular to the traveling direction of the printed circuit board, and a traveling device that reciprocates the slide table parallel to the traveling direction of the printed circuit board. A pressing tool composed of a pin or a rotating plate for pressing the lower surface of the printed circuit board from below to above; and a rotating shaft equipped with the pressing tool, PCB warpage correcting apparatus in the carrier-less soldering apparatus comprising the lower warp corrector comprising a bearing for supporting the rotary shaft.