JPH0624784Y2 - Circuit board inspection device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Purpose of Invention] (Field of Industrial Application) The present invention relates to a circuit board inspection device for inspecting a double-sided circuit board in which various electronic parts are mounted on both sides of the circuit board, and particularly to a circuit. The present invention relates to an improvement of a structure for preventing an erroneous withdrawal of a drawer plate that is mounted on a holding member and horizontally withdrawn above a holding member toward the front side.

(Prior Art) This type of circuit board inspection device that has been already proposed performs continuity inspection on a circuit board with a large number of contact pins as an object to be inspected in which various electronic components are attached only on one surface of the circuit board. .

That is, the above-described circuit board inspecting apparatus elastically implants a large number of contact pins on a pin board, and the contact pins are mounted on one surface of the circuit board to project from other electronic components mounted on the circuit board. The conductor portion of the surface is pressed up and down from above or below, so that an electrical continuity test is performed.

In this way, the circuit board as the object to be inspected has the protrusions of various electronic components formed on only one surface thereof, and the other surface of the circuit board forms the inspection circuit surface. From the other side of the body, the circuit board is brought into contact with the circuit board for measurement and inspection.

However, various electronic components used in recent circuit boards are inevitably required to be arranged in high density in order to achieve ultra-miniaturization, which causes mounting on the front and back of the circuit board, that is, on both sides. Since the double-sided circuit boards are used, it is desired that the double-sided circuit boards be tested for continuity simultaneously from above and below in a single process.

Therefore, the applicant of the present invention has proposed a circuit board inspection apparatus capable of conducting a continuity test from both the upper and lower sides of a double-sided circuit board simultaneously and in one step at a time, as disclosed in Japanese Patent Laid-Open No. 61-223666. .

This inspection apparatus includes a fixed plate that holds an upper pin board having downward contact pins at a predetermined position, and a movable plate that is attached with a lower pin board having upward contact pins and that is driven up and down at a position below the fixed plate. A holding member which is arranged between the fixed plate and the movable plate so as to be able to move up and down and is supported in a floating state by compression springs which are respectively interposed between the fixed plate and the movable plate and between the movable plate and the holding member; And a draw-out plate which is attached to the front side so as to be able to be drawn out horizontally and on which the circuit board is positioned and fixed on the upper surface. It is like this.

(Problems to be Solved by the Invention) By the way, in the conventional circuit board inspecting apparatus, there is a method of fixing the drawer plate to the holding member by a locking mechanism so that the drawer plate is not pulled out during the inspection of the circuit board. Although it is adopted, the operator sometimes forgets that the inspection is in progress and carelessly releases the lock mechanism to pull out the drawer plate. In this case, a correct inspection result cannot be obtained, and the pin tip or the inspection surface of the substrate may be damaged, making it unusable.

The present invention has been made in view of the present situation, and an object thereof is to provide a circuit board inspection apparatus capable of completely preventing the drawer plate from being pulled out during the inspection.

[Constitution of device]

(Means for Solving the Problems) In the present invention, the holding member is provided with a stopper for preventing the drawer plate from being pulled out to the front side, and the stopper is provided for raising the movable plate from the lowermost standby position. It is characterized by having an interlocking mechanism that operates in conjunction with each other.

(Operation) In the circuit board inspecting device according to the present invention, when the movable plate is lowered to the lowermost standby position, the interlocking mechanism causes the stopper to operate toward the release side and pull out the drawer plate to the front side. Tolerate. On the other hand, when the movable plate starts to move up, the interlocking mechanism causes the stopper to operate toward the locking side and prevents the drawer plate from being pulled out to the front side. Therefore, even if the lock mechanism is accidentally released during the temporary inspection, the drawer plate is not pulled out to the front side.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, reference numeral 1 denotes a flat support base. For example, four guide struts 2 are planted in each corner of the support base 1, and the upper portions of these guide struts 2 are The fixed plate 3 is fixed horizontally. And on this fixed plate 3,
An upper pin board 5 in which a large number of downward facing contact pins 4 are vertically penetrated is detachably attached.

On the other hand, below the fixed plate 3, each of the guide columns 2
A movable plate 7 for supporting the lower pin board 6 is fitted in the lower pin board 6 slidably in the vertical direction, and a large number of contact pins 8 are vertically penetrated through the lower pin board 6 so as to face upward. Moreover, it is provided so as to rise and fall elastically.

Further, between the upper pinboard 5 and the lower pinboard 6, a flat holding member 9 having a large opening in the central portion is slidable in the vertical direction on each of the columns 2 via a boss 9a. The holding member 9 and the movable plate 7 are fitted.
As shown in FIG. 2, a coil-shaped lower compression spring 10 and a coil-shaped upper compression spring 11 are interposed between the holding member 9 and the fixed plate 3, respectively. Thus, the holding member 9 is held in the floating position.

That is, on the lower plate 7a forming a part of the movable plate 7,
As shown in FIG. 2, a pair of guide pins 12 are erected upward, and the holding member 9 located right above the guide pins 12 is provided with a pair of guide pins 13. It is planted so as to penetrate vertically. Further, in the portion of the fixing plate 3 located right above each guide pin 13,
A pair of guide pins 14 are vertically provided. Each lower compression spring 10 is elastically interposed between each guide pin 12 and each of the guide pins 13 so as to be interposed between the holding member 9 and the movable plate 7. The upper compression springs 11 are mounted between the holding member 9 and the fixed plate 3 between the guide pin 14 and the upward projecting portion of each guide pin 13. Have been intervened. These compression springs 10 and 11 are set such that the spring force of the lower compression spring 10 is stronger than the spring force of the upper compression spring 11.

As shown in FIG. 1, a pair of guide members 15 each having a notched tubular shape are provided in parallel on both sides of the upper surface of the holding member 9 with the notched portions facing each other. Guide shafts 17 integrated with a drawer plate 16 forming a support frame for a circuit board W, which will be described later, are slidably engaged in the horizontal direction, whereby the drawer plate 16 is installed when the circuit board W is attached or detached. It can be pulled out to the front side of. A handle 18 for sliding the drawer plate 16 is provided on the front end face of the drawer plate 16, and the guide plate 15 slides on both ends of each of the guide shafts 17 by contacting the end face of the guide member 15. Stoppers 19 and 20 for restricting the range are provided respectively.

The drawer plate 16 is provided with an opening, which is slightly smaller than the circuit board W, in the center thereof, and the circuit board W is positioned and fixed on the opening through a positioning pin or the like (not shown). It has become. The drawer plate 16 is also provided with a lock mechanism (not shown) for fixing the drawer plate 16 to the holding member 9 at the lock position where the drawer plate 16 is pushed right below the fixed plate 3.

A stopper 22 is supported on one boss 9a of the holding member 9 through two split mounting pieces 21 as shown in FIGS.
Operates by interlocking the movable plate 7 with the interlocking mechanism 23, which will be described later, and prevents the drawer plate 16 from being pulled out during the inspection.

That is, as shown in FIG. 3, the stopper 22 includes a pin sliding cylinder 22a, a stopper pin 22b slidably arranged in the pin sliding cylinder 22a, and the stopper pin 22b. The stopper pin 22b is composed of a spring 22c for urging in a direction projecting from the moving cylinder 22a, and the stopper pin 22b is pushed from the pin sliding cylinder 22a by the urging force of the spring 22c as shown in FIG. It projects to the front of 19 and can prevent the drawer plate 16 from being drawn out even if the lock mechanism is released.

In addition, the interlocking mechanism 23 has the structure shown in FIGS.
As shown in the figure, a cylindrical main body 23b is attached to the lower end of a predetermined guide column 2 via a mounting bracket 23a. Inside the main body 23b, a pin from a slot 24 provided in the main body 23b is inserted. A stopper 23c from which 25 projects is arranged slidably. The stopper 23c is connected to the stopper pin 22b via a wire 27 inserted in the flexible jacket 26, and is constantly urged by the spring 22c in a direction to be pulled upward. As a result, as shown in FIG. 5, the pin 25 is in pressure contact with the lower surface of the movable plate 7, and the stopper 23c is in contact with the movable plate 7.
It slides in the main body 23b according to the up and down movement, and the movement is transmitted to the stopper pin 22b via the wire 27.

As shown in FIG. 2, a motor 28 with a brake is installed on the upper surface of the rear part of the support base 1. The motor 28 is rotatably mounted on the support base 1 via a bracket 29. A cam plate 31 that drives one end of the lever 30 is provided. The other end of the actuating lever 30 elastically contacts the contact member 32 provided on the lower surface of the lower plate 7a of the movable plate 7 by the spring force of the compression springs 10 and 11. The movable plate 7 is moved up and down along the guide column 2 by the rotation of the operating lever 30 accompanying the activation of the motor 28.

Next, the operation of this embodiment will be described.

When inspecting a circuit board W as an object to be inspected, first, a lock mechanism (not shown) is released to fix the drawer plate 16 to the holding member 9.
It is possible to slide against. Then, the handle 18 is grasped and the drawer plate 16 is horizontally drawn to the front side, and the predetermined circuit board W is positioned and fixed on the drawer plate 16. And then
The drawer plate 16 is pushed onto the holding member 9 and locked at the lock position.

Then, the motor 28 is started to rotate the cam plate 31 in a predetermined direction. Then, the operation lever 30 whose one end is in contact with the cam surface of the cam plate 31 is rotated, and the operation lever 30 is rotated.
The other end of the movable plate 7 pushes the movable plate 7 upward. When the movable plate 7 rises, the holding member 9 is passed through the lower compression spring 10.
Is also pushed upward, and this pushing force is transmitted to the upper compression spring 11.

By the way, since the upper end of the upper compression spring 11 is in contact with the fixed plate 3 and the spring force of the upper compression spring 11 is set to a weaker value than the spring force of the lower compression spring 10,
When the movable plate 7 starts to move upward, the upper compression spring 11 first starts to be compressed. At this time, the lower compression spring 10 is hardly compressed, so that the lower pin board 6 of the movable plate 7 is not compressed.
The relative distance between the upward contact pin 8 and the circuit board W on the holding member 9 hardly changes. On the other hand, the circuit board W on the holding member 9 is compressed by the compression of the upper compression spring 11.
The distance between the upper pin board 5 and the downward contact pin 4 gradually decreases, and finally the inspection point on the upper surface of the circuit board W contacts the downward contact pin 4. The contact pressure between the downward contact pin 4 and the circuit board W is normally obtained by pressing a pressing pin (not shown) provided on the upper pin board 5 to the circuit board W.
The upper compression spring 11 stops the compression after that.

When the movable plate 7 further rises in this state, the lower compression spring 10 starts to be compressed, and finally the upper end of the upward contact pin 8 comes into contact with the inspection point on the lower surface of the circuit board W.

When the upward contact pin 8 contacts the circuit board W with a predetermined contact pressure, the motor 28 is braked and the motor 2 is stopped.
8 stops. Then, the circuit board W is measured in this state, and after the measurement, the brake is released, the motor 28 is driven again, and the operating lever 30 starts to rotate in the opposite direction. Then, the movable plate 7 begins to descend due to the spring pressure of both compression springs 10 and 11, and stops at the lowest position to complete the inspection.

By the way, as described above, the pin 25 protruding from the stopper 23c of the interlocking mechanism 23 is in contact with the lower surface of the movable plate 7, and is constantly pulled upward by the urging force of the spring 22c of the stopper 22. Therefore, when the movable plate 7 descends to the lowest position, the stopper 23c moves downward in the main body 23b, and this movement is transmitted to the stopper pin 22b of the stopper 22 via the wire 27, and the stopper pin 22b is attached to the spring 22c. The pulling plate 16 is allowed to be pulled out to the front side by being retracted into the pin sliding cylinder 22a against the force.

On the other hand, when the movable plate 7 starts to rise from the lowest position, the stopper 23c also rises in the main body 23b, and this movement is transmitted to the stopper pin 22b via the wire 27, and the stopper pin 22b is the pin sliding cylinder. 22a to stopper 19
Project to the front of. Therefore, even if an attempt is made to pull out the pull-out plate 16 to the front side, the stopper 19 will cause the stopper pin 22b.
And the drawer is blocked.

In the above-described embodiment, the movement of the movable plate 7 is transmitted to the stopper 22 via the wire 27, but a linkage mechanism composed of a ring mechanism, electric means or the like may be used.

[Effect of device]

As described above, according to the present invention, the holding member is provided with the stopper that prevents the drawer plate from being pulled out to the front side, and this stopper is operated by the interlocking mechanism that interlocks with the rise of the movable plate from the lowest position. Even if you accidentally try to pull out the drawer plate during inspection, you can completely prevent the drawer plate from being pulled out, and you can prevent damage to the contact pins or the circuit board that accompanies pulling out the drawer plate. it can.

[Brief description of drawings]

FIG. 1 is a front view of a circuit board inspection apparatus showing an embodiment of the present invention, FIG. 2 is a right side view of FIG. 1, and FIG. 3 is II of FIG.
I-III line enlarged sectional view, FIG. 4 is an enlarged view of a part of FIG. 1,
FIG. 5 is an enlarged sectional view showing details of the interlocking mechanism, FIG. 6 is a left side view of FIG. 5, and FIG. 7 is a sectional view taken along line VII-VII of FIG. 3 ... Fixed plate, 4, 8 ... Contact pins, 5 ... Upper pinboard, 6 ... Lower pinboard, 7 ... Movable plate, 9
...... Holding member, 10 ...... Lower compression spring, 11 ...... Upper compression spring, 15 ...... Guide member, 16 ...... Drawer plate, 17 ......
Guide shaft, 19, 22, 23c ... Stopper, 22a ...
... Pin sliding cylinder, 22c ... Spring, 23 ... Interlocking mechanism, 23b ... Main body, 24 ... Slit, 25 ...
Pin, 27 ... Wire, W ... Circuit board.

Claims (1)

[Scope of utility model registration request] 1. A fixed plate for holding an upper pin board having downward contact pins in a predetermined position, and a movable plate to which a lower pin board having upward contact pins is attached and which is driven up and down at a position below the fixed plate. A holding member which is arranged between the fixed plate and the movable plate so as to be able to move up and down and is supported in a floating state by compression springs which are respectively interposed between the fixed plate and the movable plate and between the movable plate and the holding member; And a draw-out plate which is attached to the front side so as to be able to be drawn out horizontally and on which the circuit board is positioned and fixed on the upper surface. In the circuit board inspection device, the holding member is provided with a stopper for preventing the drawer plate from being drawn out to the front side, and the stopper is provided from the lowermost standby position of the movable plate. Circuit board inspection apparatus characterized by comprising an interlocking mechanism for operating in conjunction with the above descending.