JP3011603U - Electronic device terminal block mounting structure - Google Patents

Abstract

(57) [Summary] [Purpose] The terminal block can be held with a simple structure.
Furthermore, to obtain a terminal block mounting structure for electronic equipment that does not damage even if a large pressing force is applied to the terminal block. [Configuration] Two printed circuit boards 7 and 9 in the case body 1
Are arranged in parallel with each other at a distance narrower than the width of the lower surface of the terminal block 12, and the terminal block 12 is placed on one printed circuit board 9 and electrically connected to the other printed circuit board 7.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a terminal block mounting structure for an electronic device such as a programmable controller or a counter.

[0002]

[Prior art]

 FIG. 3 is an exploded perspective view showing an example of a conventional electronic device. In the figure, reference numeral 1 is a case main body made of a box-shaped resin molded product having an opening at the bottom, a display part 14 is provided on one side of the front face, and a vertical outlet having a wiring outlet 16 on the other side. A wall 15 is provided. Reference numeral 17 denotes a panel formed between the display portion 14 and the vertical wall 15, and as shown in FIG. 4, an insertion hole 18 into which a part of a terminal block 12 described later is inserted is provided, and a lower surface thereof is provided. A hook 19 having a step portion 20 is provided along the longitudinal direction of the insertion hole 18.

Reference numerals 7 and 9 denote two printed boards that are provided upright on a bottom plate 21 on which a power supply circuit, an arithmetic circuit, etc. are provided, 8 terminals formed by printed wiring, and 11 a mother printed board (not shown). Connector 22 and a display unit 22. Although not shown, the front surface of the case body 1 is closed by a cover.

In the electronic apparatus configured as described above, a part of the terminal block 12 is inserted into the insertion hole 18 from the front of the panel 17, and the lower surface thereof is placed on the stepped portion 20 of the hook 19. Then, the printed circuit boards 7 and 9 are inserted from the lower opening of the case body 1, the terminals 8 are connected to the terminal block 12, and the display unit 22 is inserted into the display unit 14 to attach the bottom plate 21 to the case. It is fixed to the main body 1. Then, external wiring such as a power line and a signal line is connected to each terminal fitting 13 of the terminal block 12, and a cover is covered.

[0005]

[Problems to be solved by the device]

 When connecting an external wire such as a power line to the terminal fitting 13 of the terminal block 12, a large pressing force is applied to the terminal block 12 when the screw of the terminal fitting 13 is tightened. When the terminal block is held only by the terminals 8, the pressing force may cause the terminal block to tilt, resulting in poor connection with the terminal 8 or the printed circuit board 7 to tilt. Therefore, as described above, the hook 19 having the stepped portion 20 is provided on the lower surface of the panel 17, and the terminal block 12 is supported by this stepped portion 20, and as described above, the pressing force is applied to the terminal block 12. Even if the terminal block 12 and the printed circuit board 7 are broken, the terminal block 12 and the printed circuit board 7 are prevented from inclining and the connection failure is prevented.

However, in the electronic device as described above, since the hook 19 having a complicated shape is provided on the lower surface of the panel 17, the die for molding the case body 1 becomes expensive, and therefore, the mold is expensive. Product cost inevitably increased. Further, since the terminal block 12 is supported only by the hooks 19, the pressing force is limited, and there is a possibility that the hooks 19 may be damaged if a large pressing force is applied to the terminal block 12.

The present invention has been made to solve the above problems, and can hold a terminal block with a simple structure, and there is no risk of damage even if a large pressing force is applied to the terminal block. The purpose is to obtain a terminal block mounting structure for an electronic device.

[0008]

[Means for Solving the Problems]

 The electronic device terminal block mounting structure according to the present invention is such that two printed circuit boards are arranged in a case body in parallel with each other at a distance narrower than the width of the lower surface of the terminal block, and the terminal block is mounted on one of the printed circuit boards. And is electrically connected to the other printed circuit board.

[0009]

[Action]

 A large amount of pressing force is applied to the terminal block when connecting the external wiring, but this pressing force can be received by one or two printed circuit boards, so the terminal block may tilt, and this may cause a connection failure. There is nothing to do.

[0010]

【Example】

 FIG. 1 is a perspective view schematically showing an embodiment of the present invention. In the figure, reference numeral 1 denotes a case main body made of a box-shaped resin molded product having an open front surface, a bottom plate provided with an outlet (not shown) for a connector, and an inner wall facing each other with a pair of concave shapes. Guide grooves 3, 3, 4, 4 are provided in parallel. The interval between the guide grooves 3, 3 and 4, 4 is smaller than the width of the lower surface of the terminal block 12 described later. Reference numeral 5 is a step portion into which a cover (not shown) provided in the opening is fitted, and 6 is a locking hole into which a locking piece provided in the cover is locked. Reference numerals 7 and 9 denote printed boards on which printed wiring is provided and a large number of electric components are mounted, for example, a power supply circuit and an arithmetic circuit are formed. And is housed in the case body 1. As shown in FIG. 2, a terminal 8 to which a later-described terminal block 12 is connected by printed wiring is provided at the upper end of one printed circuit board (hereinafter referred to as printed circuit board 7). ..

A connector 10 for electrically connecting the two printed boards 7 and 9 is provided on the surface of one of the printed boards (eg, 9) facing the other printed board (eg, 7). Further, a connector (not shown) which is attached to the bottom of the case body 1 at the lower part of one of the printed circuit boards (for example, 9) and which is exposed from the opening and is connected to, for example, a mother printed circuit board (not shown). Terminal) is provided. The display unit may be provided on either one of the printed circuit boards 7 or 9 as required. Furthermore, the distance between the two printed circuit boards 7 and 9 is narrower than the width of the terminal block 12 as described above, and when the terminal block 12 is connected to the printed circuit board 7, the upper end of the printed circuit board 9 is The height is selected so that it contacts the lower surface of the table 12.

Reference numeral 12 denotes a terminal block to which external wiring is connected. As shown in FIG. 2, a connection hole provided on one side of the lower surface is inserted into the terminal 8 of the printed circuit board 7 and connected to a power supply circuit or the like. . At this time, the other side of the lower surface is placed and supported on the printed circuit board 9. Although not shown, the opening of the case body 1 is closed by the cover as described above.

In the present embodiment configured as described above, a large pressing force is applied to the terminal block 12 when connecting the external wiring to the terminal block 12, but the terminal block 12 is supported by the printed circuit board 9, and Since the pressing force applied to the terminal block 12 is received by the two printed circuit boards 7 and 9, there is no risk of the terminal block 12 tilting or connection failure, and the terminal block 12 is damaged like a conventional hook. Nothing. The external wiring connected to the terminal block 12 is taken out from the case body 1 or the cover, or the wiring outlets (not shown) provided in both the case body 1 and the cover.

Further, in this embodiment, since the front surface of the case body 1 is opened, the inside of the case body 1 can be inspected by simply removing the cover, and the printed circuit boards 7 and 9 can be directly opened. As it can be pulled out, maintenance is extremely easy.

In the above description, the present invention is applied to the electronic device including the case body 1 as shown in FIG. 1, but the present invention is not limited to this, and is shown in FIG. 3, for example. Also in the conventional electronic equipment, the present invention is applied to other electronic equipment having other structures, such as supporting the terminal block 12 by one or two printed boards erected on the bottom plate 21 without the hook 19. can do.

Further, in the above-described embodiment, the terminal 8 is provided on the printed circuit board 7 and the terminal block 12 is connected to the terminal 8. However, the terminal 8 of the printed circuit board 7 is omitted and the terminal block 12 is omitted. The terminal metal fitting 13 may be connected to the printed board 7, or the terminal block 12 may be connected to the printed board 9.

[0017]

As described above in detail, in the electronic device terminal block mounting structure according to the present invention, the two printed circuit boards are arranged in the case body substantially in parallel with each other at a distance narrower than the width of the lower surface of the terminal block. Since the terminal block is placed on one printed board and electrically connected to the other printed board, the structure of the case body can be simplified. Therefore, the molding die is simple and inexpensive, and the product cost can be reduced. Further, since the pressing force applied to the terminal block when connecting the external wiring is received by the one or two printed circuit boards, the terminal block does not tilt or the connection failure does not occur.

[Brief description of drawings]

FIG. 1 is a perspective view schematically showing an embodiment of the present invention.

FIG. 2 is an explanatory view of the operation of the main part of FIG.

FIG. 3 is an exploded perspective view of an example of a conventional electronic device.

FIG. 4 is an explanatory view of the operation of the main part of FIG.

[Explanation of symbols]

 1 Case body 3,4 Guide groove 7,9 Printed circuit board 8 terminals 12 Terminal block 13 Terminal fittings

Claims (1)

[Scope of utility model registration request] 1. An electronic device in which an external wiring is connected to a printed circuit board provided in a case body through a terminal block provided in the case body, wherein two printed circuit boards are provided in the case body. Electronic devices characterized in that the terminals are arranged in parallel with each other at a distance narrower than the width of the lower surface of the terminal block, and the terminal block is placed on one printed circuit board and electrically connected to the other printed circuit board. Terminal block mounting structure.