JPS59150351A - Inspecting device for printed circuit board - Google Patents

Abstract

PURPOSE:To elevate the working efficiency by automatically fixing a substrate to start inspection work as soon as a detection switch detects that the printed circuit board is inserted into a positioning pin exactly. CONSTITUTION:An opening 4 is provide on the top board 3 of a case 1 and a slide plate 5 is arranged near the lateral and longitudinal rims thereof. A pair of slots 12 are provided on the width-wise rim of the slide plate 5 and a vertically movable keep plate 15 is fitted loosely thereinto 12 so that the slide plate 5 is retained at a specified position against a tensile force of a pull spring 11. A printed circuit board 54 is placed on the top board 3 covering the opening 4 and as a pin plate 19 is moved to an upper position, the tip of a check pin 33 is pressed on the substrate 54 by the elasticity of a compression spring 37. Where four positioning pins 40 are at a specified upper position, respective microswitches 52 are opened while they are closed where the pins are at a lower position. This enables automatic detection and holding of the pins at the specified positions.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention inspects the circuits of a printed circuit board positioned at a predetermined height on a top plate by bringing a large number of check bins into relatively elastic contact from below. The present invention relates to an improvement of a printed circuit board inspection device.

Since the circuit of a printed circuit board is usually a complicated network circuit,
To partially perform various checks on a circuit, the number of check bins may reach 80. Moreover, since these circuits are generally printed on a reduced scale, the operation of the test equipment must be extremely precise to ensure that the large number of check bins described above are crimped at a given circuit location.

Therefore, in order to mount a printed circuit board on an inspection device, first position the printed circuit board accurately on the inspection device, then fix the printed circuit board using a fixing means, and then insert a check bin into the printed circuit board from below. By making elastic contact, inspection preparation is completed.

Therefore, if all of these operations are performed manually, the operations will be complicated, reducing work efficiency, and there is a risk that the precision of mounting the printed circuit board may also decrease.

Therefore, in the present invention, when the printed circuit board is accurately inserted into the positioning bin, the detection switch immediately detects this,
To provide a printed circuit board inspection device that automatically drives the drive device of the fixing means to accurately fix the printed circuit board, and at the same time brings a check pin into elastic contact with the printed circuit board, thereby enabling immediate inspection work. It is.

An embodiment of the present invention will be described below with reference to FIGS. 1A to 7.

In the plan view of the device shown in FIG. 1A, the front part (lower part in the figure) of the case (1) of the device is provided with an inclined surface, and an operation switch (2) for turning on and off the excitation coil is provided. There is. This excitation coil moves a movable iron piece connected to some of the check pins (G) to be described later, and moves some of the check pins (G) to and from the printed circuit board fixed to the device as appropriate. , which facilitates circuit inspection.

A rectangular opening (4) is provided in the center of the top plate (3) provided on the top surface of the case (1), and a pair of rectangular openings (4) are provided near the left and right edges and front and rear edges of this opening (4), respectively. A slide plate (5) is provided. And this slide board (5)
are guided by a slide guide (8) disposed at the longitudinal end of the slide plate (5), and can move parallel to each other along the left-right and front-back axes of the opening (4).

Each of the pair of slide plates (5) has a clamping body (9) as shown in FIG. ) is installed.

Further, the opposite width edges of the pair of slide plates (5) are connected to the top plate (5) via a pair of tension springs Uυ.
3), and this tension spring U is thus urged to move each pair of slide plates (5) away from each other. Further, the width edge of the slide plate (5) is provided with a pair of slots (121) as shown in Fig. 1A, Fig. 1B, Fig. 2A, or Fig. 2B, and a push plate movable in the vertical direction. (1ω is loosely fitted into this slot (121,
The slide plate (5) is constructed so as to be able to remain in place against the tension of the tension spring (11).

In addition, this pushing plate (151 has a slot (1) and a tapered part (aη) in sliding contact with the bottom part (161) as shown in FIG. As mentioned above, the upper part fits into the slot (Q21), and the lower end fits into the pin plate (tl!lI) that can move up and down.
1) Fixed within.

Therefore, when the pin plate (19) is in the lower position in the case (1) as shown in FIG. 2A, the narrow part (22) formed at the upper end of the push plate (14)
The distance between each pair of slide plates (5) is maximized by the tension of the tension spring (ul).

Also, the pin plate (19) rises from the state shown in Fig. 2A, and the
In the case of the state shown in the figure, the push plate (19 taper part η
is in sliding contact with the bottom αe of Let, and slides the left and right slide plates (5) toward each other against the tension of the tension spring Uυ.

By the way, the above vertical movement of the pin plate (19) is shown in Fig. 2A, Fig.
This is carried out by the lifting device shown in FIGS. B, 6, 4A, and 4B.

In other words, the rotation axis (26) is connected to the left and right walls (
,! A pair of disks are supported by a rotary shaft, and ω is the axis of rotation (2
It is fixed to the end of e.

Further, the disk (a position a predetermined distance apart from the center of the two seagulls) and the pin plate (a pair of guide plates (to) disposed at the left and right ends of 19 are connected by a link c11).

In addition, a pulley (B) is fixed to one end of the rotating shaft (To),
4A or 4B between this pulley (5) and the pulley (to) of the air solenoid 64 fixed to the wall (c).
As shown in the figure, the belt O is wrapped around the belt.

Next, as shown in FIG. 1A, a large number of check pins are installed at predetermined positions of the pin plate (11) so as to be able to move up and down accurately with respect to the pin plate (19). That is, as shown in FIG. 2A or FIG. 2B, the check pin □□□ is inserted into the guide hole (compression spring G7 loosely fitted into the hole and wound around the check pin (C)) provided in the pin plate Q'J. is interposed between the 7-lunge (to) and the pin plate H.

Therefore, as will be described later, if the printed circuit board (B) is placed on the top plate (β) covering the opening (4) and the temporary bin l is moved to the upper position shown in FIG. 2B, Check pin (
The tip of the connector 67) is pressed against the printed circuit board 5 by the elasticity of the compression spring 67).

Next, four positioning bins (4G
Regarding this positioning pin (4), it is fixed to the pin plate H as shown in FIG. It is configured to be able to slide up and down.

In other words, a 7 flange (44) is fixed to the axially intermediate portion of the positioning pin (4Q), a support tube (50) is inserted from above into the locating pin (4G), and the support tube 601 is fixed by the 7 flange (44). Then, attach the sleeve (41) via the positioning pin (the upper part of 4G is the support tube 60).
In the upper large diameter part (43), and the lower part is the sleeve (43).
1) Guide each in the lower small diameter part (481).

In addition, the spring (4) is housed in the large diameter part (431), and the stepped part (45) in the large diameter part (4) and the flange (44) serve as spring seats, so that the compressive load is borne. It can be so.

In addition, there are 7 lunges (4
7), and then tighten the positioning pin (401) and sleeve (41).
) so that a predetermined initial compressive load can be obtained when they are assembled together.

°In addition, a small diameter part (No. 481 screw) is cut into the lower part of the sleeve G11), and after inserting this small diameter part (48) into the hole (to) provided in the pin plate (to), screw the thread into the above threaded part. ) (4
1 and tighten it so that the positioning pin (4G) can be fixed to the pin plate (t'J).

Furthermore, on the bottom of the pin plate (11), attach the bracket G.
The four microswitch switches 4 are fixed via υ, and each actuating lever 53 of these four microswitches 621 is used.
When the free ends of the locating pins (40) are in a predetermined upper position (
In other words, when the microswitch 621 is in the open state (as indicated by the solid line in FIG. 5), the microswitch 15B is in the closed state (as indicated by the imaginary line in FIG. 5). Configure it as follows.

By the way, in order to inspect a printed circuit board (goods) using the apparatus configured as described above, first open the opening (4) on the top plate (3) of the apparatus in the state shown in Figure 1A or Figure 2A. Cover the printed circuit board! 54).

In this case, the four positioning pins (4 (I) erected from the pin temporary housing 9 and the ends of the four guide holes drilled in the printed circuit board (54) corresponding to the positioning pins (40) are fitted into each other. Since the printed circuit board 54) is aligned, the positioning of the printed circuit board 54) can be performed extremely accurately.

In this case, 4 positioning pins (4G is a spring (42
1 and stops at a position where the weight of the printed circuit board (54) and the reaction force of the spring 0 are exactly balanced. pin(
If you set a height difference between the two in advance so that there is still a difference in height between the two and There's nothing to do.

In addition, when the four positioning pins are lowered together as described above, each lever (5) is pushed by each positioning pin (4G) and displaced downward, so the four microsinches (5) are in the closed state. .

Therefore, the four microswitches G connected to the four positioning pins are connected in series as shown by symbols (FM, ) to (Sw4) in the circuit diagram shown in Figure 6, and the air solenoid If the solenoid (S) of a solenoid valve (not shown) inserted into the supply/discharge pipe (34) and a power source are connected to this to form a circuit as shown, the printed circuit board 64) will be tilted or biased. When supported by the four positioning pins (4G), all four microswitches are closed, so the solenoid (S) is activated, and the solenoid valve resists the spring (not shown). Then, by switching the solenoid valve, the air solenoid (34) starts to move forward through a predetermined stratum corneum.

The forward rotation of and is transmitted to the rotating shaft (26) via the bell (32), and the rotating shaft (to) rotates counterclockwise from the position of FIG. 4A to the position of FIG. 4B. It is rotated 90° forward. As a result, the pin plate (to) rises from the lower position shown in FIG. 2A to the upper position shown in FIG. 2B.

Therefore, the printed circuit board (56 or 4 positioning pins)
40, and at the same time the slide plate (5)
They start sliding toward each other. And the pin plate (I
When I reaches the position shown in FIG. 2B, the printed circuit board 5
4) is held between the top and bottom by the substrate holder ao and the support cylinder 6, and the right and left and front and back sides are held by the holding bodies (9), so that it is securely fixed on the apparatus.

Note that if the top surface of the printed circuit board 64 comes into contact with the board holder (10) during the lifting process of the pin plate (1),
The printed circuit board 64) is prevented from rising, and the support tube (5) is pushed deeper into the sleeve (4I) by the printed circuit board G.

Therefore, the four positioning pins (4f) descend while resisting the force of the spring, and the height difference that existed between the tips of the multiple check pins and the upper end surface of the support tube 6 gradually disappears. Therefore, the tips of the plurality of check pins (, 33) are connected to the wiring pattern 6 provided on the bottom surface of the printed circuit board (54).
It will be strongly pressed into the predetermined position of ω.

If a measuring device is connected to the terminal (6) arranged on the rear surface of case +1 and connected to the plurality of check pins θ■ by conductor wires (a), the circuit between the ends of each check pin can be established. The situation can be freely inspected using measuring equipment. In this case, if the check pin (to) whose vertical position can be controlled is brought into contact with and separated from the wiring pattern (g) by operating the operation switch (2), various circuit tests can be easily performed.

In addition, in FIG. 6, the microswitches (S
The limit switch (R8W) inserted in parallel with Wl) to (SW4) is <1. as shown in FIGS. 2A and 2B. The wall (located above the pin plate)
C) is fixed.

When the pin plate (1!J) is in the position shown in Figure 2A, the limit switch (R8W) is in the open state, and when the pin plate (Ll) starts rising as above, the limit switch (R3W) is in the open state.
If the solenoid (swl) is adjusted so that it contacts the pin temporary → and becomes closed, even if one of the switches (swl) to (history 2) opens unexpectedly due to vibration, the solenoid ( The energization to S) is not hindered, and the ascending movement of the bottle temporary housing 9, once started, is continued smoothly.

Next, when you want to remove the printed circuit board 4) from the device after completing the inspection, press the push button switch ) of the circuit branched from near the power supply (8) in the circuit shown in Figure 6. ), a circuit is formed that returns to the power source via the timing relay (RL), and the relay contact (RLl)
will be closed, so even if you release your hand from the push button switch (6) and the push button switch (B) opens,
The timing relay (RL) continues to be energized.

In addition, since the relay contact (RL1) becomes the above-mentioned closed state and the relay contact (RL2) becomes open state at the same time, the solenoid (S) is cut off from the power source, and the solenoid valve is returned to the double-acting state by the spring. Can be switched. Then, by switching the solenoid valve, the air solenoid (34) starts to rotate backward (reversely) through a predetermined angle. Then, the rotation of the backward rotation 3 is transmitted to the rotation @f26), and the rotating shaft (20 rotates clockwise from the position of Fig. 4B to the position of Fig. 4A)
0° return rotation (reverse rotation). As a result, the pin plate (19) is returned from the position shown in FIG. 2B to the position shown in FIG. 2A.

After this, the time set in the timing relay (RL) has elapsed, and the relay contact (RL,) becomes open, and at the same time, the relay contact (RL2) also becomes closed.

As a result, the circuit shown in FIG. 6 completely returns to its initial state, and when a new printed circuit board (54) is placed on the device, the printed circuit board (54) is automatically fixed again and one or more forces are applied. The check pin (to) is securely crimped onto the printed circuit board.

By the way, the above-mentioned embodiment uses an air solenoid (C34) to automate the lifting device (c).
Compressed air (Ma,
It is difficult to maintain a constant state of supply. Therefore, if the lifting device (c) is configured so that it can be switched manually depending on the situation, the operating rate of the inspection device will be significantly improved.

Manual device (GO) shown in Figures 1A to 4B! Well, the rotation axis (on one end of 261)
) so that it can be attached and detached freely.
As shown in Figure 7, the hole with a bottom (64
) is drilled and a grip bar +65 is fitted into this hole (64).
1, pass through the bottom of the ω hole (goods) and insert the bolt (61
19 and is assembled by screwing them together.

In addition, this) 1-dle haze and the rotating shaft (c) have a chrysanthemum seat surface (67) carved on the end surface where they come into contact with each other, and the rotating shaft (4
) and tighten the bolt 6υ in the axial direction of /%
7)" /L/ (goods) is fixed to the rotating shaft (c). In this way, when torque is applied to the handle haze, this torque is reliably transmitted to the rotating shaft (2!) by the meshing chrysanthemum seat surface (goods). Ru.

The above handle fi2) can be easily removed from the rotating shaft (20) by attaching and detaching the bolt (6υ), so during normal automatic operation, it can be removed and placed without causing any danger. Removal also has the effect of making packaging much easier, especially when transporting the device.

Although the present invention has been described above with reference to examples, the above-mentioned examples do not limit the present invention, and various changes can be made based on the technical idea of the present invention. For example, the positioning bin tap and check bin (3 moats) may be installed on the top plate (3).In this case, the lifting device (c)
is a means for lowering the printed circuit board (5) placed on the positioning pin (4) from above the check pin (33) and fixing or unfixing it at the position where it contacts the check pin system. It just has a function.

In addition, the number of positioning pins (41) may be 6 or 4 or more.In this case as well, microswitches (5) are arranged for each positioning pin (4t), so they are connected in series. The number of 6 microswitches increases or decreases in accordance with the number of positioning pins (401).

Furthermore, in the embodiment, the drive device includes an air solenoid (34).
However, it is also possible to use a reciprocating drive device, such as a motor, in place of the air solenoid (34). Alternatively, an ordinary electric motor may be used.G1゜The printed circuit board inspection device according to the present invention relatively elastically contacts a large number of check pins from below to a printed circuit board positioned at a predetermined height position on a top plate. The printed circuit board inspection apparatus for inspecting the circuit of the printed circuit board includes a positioning pin for inserting and positioning the printed circuit board, a detection switch for detecting the printed circuit board inserted into the positioning pin, and a detection switch for detecting the printed circuit board inserted into the positioning pin. The present invention is configured to include a drive device that is driven by the detection of the printed circuit board by the switch and brings the plurality of check pins into relatively elastic contact with the printed circuit board from below.

Therefore, according to the present invention, it is confirmed that the printed circuit board is inserted into the positioning pins accurately, and the check pins are automatically brought into elastic contact with the printed circuit board, so that the mounting of the printed circuit board to the inspection device and the Dogs help improve work efficiency by making test preparation work easier and more accurate.

[Brief explanation of the drawing]

Figures 1A and 1B are plan views of the printed circuit board inspection device, and Figure 1A is the state before the printed circuit board is placed;
Figure 1B shows a state in which the printed circuit board is held in the inspection device.
2A and 2B are vertical cross-sectional views of the printed circuit board inspection device, in which FIG. 2A is the state before the printed circuit board is placed, FIG. 2B is the state where the printed circuit board is held in the inspection device, and FIG. The figure is a partially cutaway side view of the same inspection device as above, FIGS. 4A and 4B are perspective views showing the part that holds the printed circuit board, and FIG. 4A shows a state in which the printed circuit board is not yet held by the inspection device. Figure 4B shows the state in which the printed circuit board is held in the inspection device, Figure 5 is an explanatory diagram of the positioning pin operating mechanism, Figure 6 is an electric circuit diagram for controlling the lifting device, and Figure 7 is the manual device. FIG. 3 is an exploded perspective view. Also, in the symbols used in the drawings, (3)......Top plate (c)...
・・・・・・・・・Lifting device (to)・・・・・・・・・
・・・・・・Check pin (34)・・・・・・・・・・・・
・Air solenoid (40・・・・・・・・・・・・・
・6 positioning pins・・・・・・・・・・・・Micro inch (54)・・・・・・・・・・・・・・・Printed circuit board. Agents: Masaru Saturn, Yoshio Tsunekami, Toshiki Sugiura (1) Procedural amendment March 25, 1980 To the Commissioner of the Japan Patent Office 2 Name of the invention Tachimi Saito 34-55 Aizu-cho, Shirakawa City, Fukushima Prefecture 6, Amendment The number of inventions increases due to 7, drawings subject to amendment -

Claims (1)

[Claims] In the printed circuit board inspection device, the circuit of the printed circuit board is inspected by bringing a large number of check bins into relatively elastic contact from below with the printed circuit board positioned at a predetermined height on the top board. A positioning bin for inserting and positioning a printed circuit board, a detection switch for detecting the printed circuit board inserted into the positioning bin, and a detection switch that detects the printed circuit board to drive the above-mentioned numerous check bins relative to the printed circuit board from below. 1. A printed circuit board inspection device characterized by comprising a driving device that makes elastic contact with the printed circuit board.