JPH03215754A - Inspection device for packaged printed board - Google Patents

Abstract

PURPOSE:To improve the safety by moving down a pressing base slowly in balance relation with a balancer, locking it with a locking pin at a specific position close to the printed board, and elevating a board fitting base with a cylinder. CONSTITUTION:The printed board 7 is placed on an inspection base 10 and a rotary handle 12a is rotated to adjust the height position of the board 7 finely. Then an up/down driving means 9 moves down the pressing base 2 slowly toward the board 7 in relation with the balancer 3 and a detection switch 11a is turned on at the specific position. Then a plunger 11b is driven and a hook 11f is engaged with the projection part of the pressing base 2. Then the means 9 is put in operation to elevate the board fitting base 8, whose the top surface is pressed against a pressing pin 6a. Terminal legs of electronic components mounted on the board 7 and a circuit pattern are pressed against the inspection pin 10b of an inspection base 10 to measure a voltage and a current at a position where the board comes into contact with the pin 10b. Thus, a hand is never caught on the board and the safety can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an apparatus for inspecting pattern bridging on a printed circuit board on which electronic components are mounted, defects in the mounted electronic components, and the like.

[Prior Art] As shown in FIG. 6, a conventional inspection device of this type includes a press base C equipped with a press pin b that presses a predetermined location of the print substrate Fia toward the bottom surface; A board mounting base d for mounting the printed circuit board a at a predetermined position facing the pressing pin b of the pressing stage C, and an inspection pin e that contacts the wiring pattern of the printed circuit board +i a on this board mounting base d.
It is composed of

Then, by operating an operating member such as a switch,
Either one or both of the press base C and the board mounting base d is raised and lowered by an air cylinder or a hydraulic cylinder f, and the press pin b is placed at a predetermined position on the printed circuit board a′, for example,
Since the printed circuit board a is pressed against the inspection pin e by coming into contact with a position other than the electronic component mounted on the printed circuit board a, the inspection pin e is connected to the terminal leg of the mounted electronic component or a predetermined wiring pattern. Contact position.

In this state, a voltage is applied to the printed circuit board a from a predetermined inspection pin e, and the voltage and current of each part of the printed circuit board a are passed through the detection pin to an inspection circuit incorporating a computer. This test is to perform the following tests.

(Problems to be Solved by the Invention) In such a mounted printed circuit board inspection device, an air cylinder,
Mechanical driving force such as a hydraulic cylinder e is used, and the lifting and lowering is performed by an operator operating an operating member such as a hook that operates these.

By the way, in order to perform the above-mentioned work, the operator must set the printed circuit board tia on the board mount d and then operate the operation members to perform the inspection work, but the operator may become fatigued due to long hours of work, etc. , due to lack of attention, etc., the user accidentally operated the operating member with one hand inserted between the printed circuit board a and the pressure pin b, and the hand was caught between the printed circuit board a and the pressure pin B, resulting in injury. There were problems such as doing this.

In addition, the driving force that forces the press pins B to pinch the printed circuit board A is close to 1 ton, which can lead to serious injuries and serious accidents, causing major problems in terms of the working environment. Ta.

The present invention is intended to solve the above-mentioned problems, and its purpose is to lower the pressure table slowly so that even if your hand is caught between the pressure pin and the printed circuit board, you will not be injured. In addition, there is no risk of getting your hands caught in the position where the pressing pin contacts a predetermined position on the printed circuit board, so we have created an inspection device for mounted printed circuit boards that will not cause injury in this case. It is not intended to be provided.

[Means to solve the problem]

The inspection device for a mounted printed circuit board of the present invention is intended to achieve the above-mentioned object, and its means include a press table having a press pin that gently descends in relation to a parallelizer, and a press table that is lowered to a predetermined position. Then, the locking mechanism moves to engage the hook and prevent the pressing table from rising, and the locking mechanism moves toward the pressing table fixed, bringing the pressing pin into contact with the top surface of the printed circuit board, and the reaction force causes the pressing pin to contact the top surface of the printed circuit board. The tester is equipped with a board mounting base for press-contacting test pins to a printed circuit board.

[Function] The inspection device for a mounted printed circuit board of the present invention configured as described above lowers the press base gently due to the balance relationship with the balancer, and when it descends to a predetermined position close to the printed circuit board, the lock pin is activated. In this state, the board mount to which the printed circuit board is attached is raised by a cylinder, and the test pin is brought into reliable contact with a predetermined measurement point on the printed circuit board.

[Embodiment of the Invention] Hereinafter, an embodiment of the inspection apparatus for a mounted printed circuit board according to the present invention will be described with reference to FIGS. 1 to 5.

(2) is a base frame on which two guide balls 1a are fixed between the left and right upper and lower parts of the front, and two guide balls 1b are suspended from the rear left and right upper parts; 3 is a balancer that is guided so as to be raised and lowered by the guide bar 1b. The balancer 3 and the press base 2 are connected by a pair of connecting bands 4 such as chains, and the connecting band 4 is attached to a chain wheel IC rotatably attached to the upper surface of the base frame l. It is wrapped. Then, the press base 2 and balancer 3
Since the weight of the press base 2 is approximately the same as that of the press base 2,
can be moved up and down with very weak force.

Further, the balancer 3 is attached with a vertical drive means 5 such as a small diameter air cylinder or a hydraulic cylinder whose one end is attached to the base frame 1.
When the press base 2 is expanded by an operating means (not shown), the press base 2 is lowered, and when it is contracted, the press base 2 is raised.

Reference numeral 6 denotes a pressing plate to which a pressing pin 6a is attached, and is detachably attached to the lower surface of the pressing table 2 described above. The pressing pins 6a implanted in the pressing plate 6 have different arrangement relationships depending on the type of printed circuit board 7 to be inspected. Therefore, when changing the type of printed circuit board 7 to be inspected, It is something to be replaced.

Reference numeral 8 denotes a board mounting table which is guided in a vertically movable manner by the guide pole 1a of the base frame 1 described above, and which is moved up and down by a vertical drive means 9 such as an air cylinder or a hydraulic cylinder;
Reference numeral 10 denotes a holding member 10 which is an inspection stand replaceably attached to the board mounting stand 8 and which holds the printed circuit board 7.
Inspection pins 10 are formed and come into contact with terminal legs and wiring patterns of electronic components mounted on the printed circuit board 7.
b is planted. This inspection table 10 has the above-mentioned pressure +
Similar to 5.6, the arrangement relationship differs depending on the type of printed circuit board 7 to be inspected, and therefore, it should be replaced when the type of printed circuit board 7 to be inspected is changed.

Reference numeral 11 denotes a lock groove that prevents the pressing table 2 from rising when the pressing table 2 is lowered to a predetermined position;
A detection switch lla that is turned on when the press base 2 is lowered to a predetermined position, a plunger 1lb that is energized when the detection switch lla is turned on, one end of which is pivotally supported by the suction rod 11c of the plunger llb, and the other end is an arm lid pivotally supported by the base frame l, a connecting lever lie having one end pivotally supported by the suction rod 11c of the plunger, one end being pivotally supported by the other end of the connecting lever lie, and the other end being pivotally supported by the connecting lever lie. and a hook llf pivotally supported by the base frame 1 (see FIG. 4).

Then, when the press base 2 is lowered to a predetermined position, that is, 10 to 15 m above the upper surface of the printed circuit board 7, the detection switch 11a is turned on and the suction rod IC of the plunger llb protrudes from this locking groove. , the hook llf is displaced via the connecting lever lie and engaged with the protrusion 2a of the lowered press base 2, thereby locking the press base 2 so that it does not move upward due to the pressing force from below.

12 is an adjustment mechanism for adjusting the height of the board mount 8, and includes a rotary handle 12a protruding from the base frame 1, a worm 12b fixed to the rotary handle 12a, and meshing with the worm 12b. The rotating shaft 12d rotates in conjunction with the rotation of the wheel 12c and can move freely in the vertical direction, and on which the board mounting base 8 described above is supported. Also,
Male thread 12 formed at the lower part of this rotating shaft 12d
e is screwed into the female thread 9b of the lifting rod 9a of the vertical drive means 9, and the worm 12b, wheel 12c and rotating shaft 12d are surrounded by a frame 12f, which is Base frame 1 mentioned above
installed on.

Then, when the rotary handle 12a is rotated, the worm 1
2b, and the rotating shaft 12d is rotated via the wheel 12c, so the rotating shaft 12d rises due to the relationship between the male screw 12e and the female screw 9b, so the board mounting base 8 that is pivotally supported on the rotating shaft 12d It moves up and down with respect to the ascending rod 9a according to the amount of rotation of the rotary handle 12a.

Next, to explain the operation based on the above-mentioned configuration, first, the printed circuit board 7 is placed on the inspection table 0, and then the height position of the printed circuit board 7 is finely adjusted by rotating the rotary handle 12a. do.

Next, when the vertical drive stage 5 is operated and extended, the press base 2 starts to gently descend toward the printed circuit board 7 in relation to the balancer 3, and when it descends to a predetermined position, it hits the detection switch lla. The detection switch lla is turned on. Therefore, the plunger llb is driven to engage the hook llf with the protrusion 2a of the press base 2. In this state, the press pin 6a implanted in the press base 2 is fixed at a position 10 to 15 m above the top surface of the printed circuit board 7.

Next, when the vertical drive means 9 is operated, the board mounting base 8
rises and presses the top surface of the printed circuit board 7 against the pressing pins 6a. Therefore, the terminal legs and circuit patterns of electronic components mounted on the printed circuit board 7 are
It is pressed against the test pin fob and can measure the voltage and current at the position where it makes contact with the test pin fob.

[Effects of the Invention] As described above, in the present invention, the pressure table is slowly lowered to a position close to the printed circuit board, so even if the worker accidentally places his or her hand on the printed circuit board during this work, there is no chance of injury. Also, since there is no space to insert your hand when the pressure base is in the locked position, there is no risk of injury even if the board mounting base is raised by the cylinder. It has the effect that there is no such effect.

[Brief explanation of drawings]

The figures show an embodiment of the printed circuit board inspection device of the present invention, in which Fig. 1 is a front view, Fig. 2 is a side view, Fig. 3 is a rear view,
FIG. 4 is an enlarged side view showing the locking mechanism of the press base, FIG. 5 is a partially sectional side view of the elevation adjustment mechanism of the board mounting base, and FIG. 6 is a front view of a conventional example. 2... Pressing stand, 3... Palancer, 6... Pressing plate,
6a...Press pin, 7...Printed circuit board, end...board mounting stand, 9...vertical drive means, 10...inspection table,
10b...Inspection pin, 11...Lock mechanism, llf
...Hook, 12... Lifting adjustment mechanism. 1C 1C I Figure 2 Figure 3 Figure 5

Claims (1)

[Claims] A press base having a press pin that slowly descends in relation to the balancer; a locking mechanism that operates when the press base descends to a predetermined position and engages a hook to prevent the press base from rising; and a locking mechanism that locks the base. Inspection of a mounted printed circuit board, characterized by comprising: a board mounting table that moves toward a press base that has been placed, brings a press pin into contact with the top surface of the printed circuit board, and presses the test pin against the printed circuit board by the reaction force thereof. Device.