JPH0897551A - Board holding jig - Google Patents

Abstract

PURPOSE: To provide a board holding jig for soldering which has a simple constitution and can press down discrete parts having very different heights under optimum pressure even when the parts are closely arranged. CONSTITUTION: A board holding jig is provided with a rotary frame 13 which supports a printed circuit board 6 mounted with discrete parts 9 and can be inverted, the lid 15 of the frame 13 which is provided with a plurality of spring- equipped pins 14 which are planted at prescribed intervals and fix the parts 9 by pressing the parts 9 against the board 6, rotary holding section 12 which inverts the frame 13 and holds the frame 13 and lid 15 in openable states, and position fixing means 11 which fixes the position of the frame 13.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a jig for holding discrete components on a printed circuit board (hereinafter referred to as a "substrate holding jig") in the soldering work of the discrete components to the printed circuit board.

[0002]

2. Description of the Related Art Conventionally, an electronic device such as a personal computer has a built-in printed circuit board to which discrete components having leads such as a semiconductor integrated circuit and a capacitor are circuit-connected. In this printed circuit board assembly process,
Since it is difficult to insert leads into the board, it is not possible to automate the assembly like chip parts, and discrete parts are manually mounted and soldered on a printed board. Therefore, in order to improve workability, a substrate holding jig is usually used.

Regarding this substrate holding jig, an actual flat plate 5-0
An example disclosed in Japanese Patent Publication No. 95078 will be described with reference to the drawings. As shown in FIG. 4, the handle 1
Is fixed to the fixed frame 2 by the lock mechanism 3, the printed board 6 is placed on the rail 8 of the rotary frame 7 with the lid 4 opened by the spring 5, and the discrete component 9 is mounted according to the circuit. Then, when the lid 4 is closed, the discrete component 9 is pressed and supported by the sponge 10 mounted at a predetermined position on the inner surface of the lid 4. Next, the lock mechanism 3 is released from the handle 1, the rotating frame 7 is rotated 180 degrees, and the handle 1 is fixed to the side opposite to the position where the discrete component 9 is mounted. Soldering is performed in this state, and after the soldering is completed, the lock mechanism 3 is released, the rotary frame 7 is returned to the original position, the lid 4 is opened, and the soldered printed circuit board 6 is taken out.

[0004]

However, when soldering is performed by using the substrate holding jig having the above-described structure, the discrete components usually have different outer dimensions, and in particular, the discrete components having a large height difference are used. When soldering printed circuit boards that are placed close to each other, the sponge cannot be pressed down sufficiently and discrete components with a low height are soldered, so when the printed circuit board is turned upside down, it rises or comes off. In some cases, there is a problem that soldering failure occurs.

In order to solve this problem, sponges having various thicknesses are prepared, and depending on the printed board,
There has been a problem that a laborious preparation work of replacing a sponge having an optimum thickness at an optimum position is required, and that a work of attaching an elongated sponge is very difficult.

In order to solve the above-mentioned problems, an object of the present invention is to provide a simple structure, and even if discrete components with a large difference in height are arranged close to each other, they can be pressed down with the optimum pressure. It is to provide a substrate holding jig.

[0007]

SUMMARY OF THE INVENTION According to the present invention, a reversible rotating frame for supporting a printed circuit board on which discrete components are mounted and a discrete component mounted on the printed circuit board are pressed and fixed onto the printed circuit board. A lid equipped with a plurality of spring-loaded pins that are planted at predetermined intervals,
There is provided a substrate holding jig comprising: a rotation supporting portion that holds the rotation frame and the lid so as to be openable and closable, and a position fixing unit that fixes the position of the rotation frame. Also,
The spring-loaded pin includes a pressure adjusting means for the discrete component, and the rotating portion includes a rotation supporting portion having one side of the rotation frame as a rotation axis and a base plate for horizontally supporting the rotation frame. It is desirable to provide the position fixing means. Further, the substrate holding jig for densely arranging the pins on a lid at a predetermined interval is provided.

[0008]

According to the above construction, the spring-loaded pin at a position corresponding to each discrete component on the printed circuit board is adjusted to be pressed according to the height of each discrete component, so that the lid can be closed. Since individual discrete components can be pressed into the printed circuit board with the optimum pressure, it is possible to prevent defects due to floating and falling of the discrete components.

Further, since the pins are pressed by the thin spring-loaded pins, it is possible to individually press the optimum pressed parts even for discrete components which are arranged very close to each other and have a large height difference. Furthermore, the pressure adjusting means can be prepared simply by adjusting the length of the spring.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In the figure, the same parts as those in the conventional example are designated by the same reference numerals and the description thereof will be omitted.

As shown in FIG. 1, the substrate holding jig of the present invention includes a rotating frame 13 which is held on a base plate 11 by a rotation supporting portion 12 so that it can be turned upside down by being rotated 180 degrees, and this rotating frame. A lid 15 that is openably and closably attached to a plurality of springs 13 and has a plurality of spring-loaded pins 14, 14, ... Arranged relatively densely in a matrix and is attached so as to be pressed inward.
And a lock mechanism 16 for fixing the lid 15 and the rotary frame 13 in a closed state.

Then, this substrate holding jig is used as follows. First, with the lid 15 opened (not shown), the printed circuit board 6 is placed on the rotary frame 13 and the discrete component 9 is mounted according to the circuit. Then, the lid 15 is closed, and the lid 15 is rotated by the lock mechanism 16 to rotate the frame 1.
Fix to 3. Then, the discrete component 9 is pressed and supported on the printed circuit board 6 by the plurality of spring-loaded pins 14, 14 ... Arranged in a matrix on the lid 15 and mounted so as to be pressed inward. .

Then, as shown in FIG. 2, with the lid 15 closed, the rotary frame 13 is rotated by 180 degrees about the rotary support portion 12, and the printed circuit board 6 on the side opposite to the position where the discrete component 9 is mounted. Rotation frame 1 so that the side of
Turn 3 over and fix. In this state, the leads of the discrete component 9 protruding on the back surface of the printed circuit board 6 and the circuit on the printed circuit board 6 are soldered, and after the soldering is completed, the rotary frame 13 is rotated by 180 degrees around the rotary support portion 12. Turn it back to its original state, release the lock mechanism 16,
The lid 15 is opened, and the soldered printed circuit board 6 is taken out.

According to this embodiment, the mounting and soldering of the discrete component on the printed circuit board can be held horizontally on the base plate simply by rotating the rotary frame 180 degrees like opening and closing the door. Workability is improved because it can be carried out.

As shown in FIG. 3, each of the plurality of spring-equipped pins 14 is provided with an adjusting nut 17 for adjusting the length of the spring as independent pressure adjusting means. By adjusting the length of the spring of the spring-loaded pin 14 according to the height of the discrete component 9 to be pressed, the individual discrete component 9
Since each of them is pushed into and held by the printed circuit board 6 with an optimum pressing force, the discrete component 9 does not rise or fall off from the printed circuit board 6 due to reversal at the time of soldering. Therefore, it is possible to prevent the occurrence of defective soldering and to easily adjust the spring.

As described above, the rotary frame for holding the printed circuit board is
The example in which the substrate holding jig having a structure in which one side of the rotating frame is rotated by 180 degrees and inverted and the adjusting nut for adjusting the length of the spring is used has been described, but the present invention is limited to the example described above. However, the present invention can be applied to a substrate holding jig having a structure in which the central portion of a rotary frame shown in the conventional example is rotated 360 degrees about a rotary shaft, and a pneumatic spring or the like that uses air pressure as a pressure adjusting means for a spring-loaded pin Any adjustable spring can be used. Also, since the spring-loaded pins are relatively densely erected in a matrix, even if the positions of discrete components on the printed circuit board differ depending on the product,
There is no need to change the position of the spring-loaded pin each time, and the complexity is eliminated.

[0017]

According to the present invention, the spring-equipped pin at a position corresponding to each discrete component is adjusted to be pressed according to the height of each discrete component, so that it is optimal only by closing the lid. Since individual discrete parts can be pressed into the printed circuit board by pressing,
It is possible to prevent the occurrence of defects due to floating or falling of parts.
Further, since the spring-loaded pin is used for pressing, it is possible to cope with a discrete component having a large height difference which is arranged very close to each other. Furthermore, the pressure adjusting means can be prepared simply by adjusting the length of the spring.

[Brief description of drawings]

FIG. 1 is a perspective view of a substrate holding jig according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a usage state of a substrate holding jig according to an embodiment of the present invention.

FIG. 3 is a side view of a main part of a spring-loaded pin according to an embodiment of the present invention.

FIG. 4 is a perspective view of a conventional substrate holding jig.

[Explanation of symbols]

 6 Printed Circuit Board 9 Discrete Parts 11 Base Plate 12 Rotation Support Section 13 Rotating Frame 14 Spring Pin 15 Lid 16 Lock Mechanism 17 Adjustment Nut

Claims (4)

[Claims] 1. A reversible rotating frame for supporting a printed circuit board on which discrete components are mounted, and discrete components mounted on the printed circuit board are planted at predetermined intervals so as to be fixedly fixed on the printed circuit board. A substrate comprising: a lid including a plurality of spring-loaded pins; a rotation support portion that holds the rotation frame and the lid so that the rotation frame can be opened and closed; and a position fixing unit that fixes the position of the rotation frame. Holding jig. 2. The substrate holding jig according to claim 1, wherein the plurality of spring-equipped pins are provided with pressure adjusting means for the discrete components. 3. The rotating part comprises a rotating support part having one side of the rotating frame as a rotation axis, and a position fixing means composed of a base plate for horizontally supporting the rotating frame. Item 1. A substrate holding jig according to item 1. 4. The substrate holding jig according to claim 1, wherein the spring-loaded pins are erected on the lid at predetermined intervals.