JPH11224111A - Programmable controller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a programmable controller which simplifies the structure of its housing and can easily be assembled by storing a size-reduced printed board and is easy to maintain. SOLUTION: This programmable controller consists of a base 1 which consists of a bottom plate 11 and peripheral walls 12 and is constituted by forming engagement holes 17 in the peripheral walls 12 on both the sides, projecting fitting arms 13 for fitting to at least two panels from the peripheral walls 12, forming tapped holes 16 for printed board fixation in the front side of the bottom plate 11, and providing a fitting part 20 for fitting to a rail on the back side, a cover 6 which consists of a front plate 61 and peripheral walls 62 and is constituted by forming recessed parts 63a and 63b for exposing terminal bases at an upper and a lower part and projecting engagement pieces 64 having engagement claws projecting out atop from the internal surfaces of the peripheral walls 12 on both the sides to the opposite sides of the front plate 11, and a printed board 4 where a CPU, an input/output circuit, etc., are constituted by mounting electric components, etc., and the terminal bases are fitted at the upper and lower parts, and the printed board 4 is fixed to the front side of the base 1, the cover 6 is mounted thereupon by engaging the engagement claws of the engagement pieces 64 with the engagement holes 17 of the base 1, and the terminal bases are exposed through the recessed parts 63a and 63b of the cover 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a programmable controller, and more particularly to a programmable controller housing and a printed circuit board which are significantly smaller than conventional programmable controllers.

[0002]

2. Description of the Related Art Programmable controllers (hereinafter, referred to as PCs), which include a CPU unit, an input / output unit, a power supply unit, and perform sequence control of a control target, have recently been widely used in various fields.

[0003]

Although such a PC differs depending on the number of objects to be controlled, the length of the bottom of the housing (the surface to be attached to the panel) is generally 100 to 300 mm.
A considerably large one with a horizontal length of 300 to 500 mm and a height (projection length from the panel surface) of about 100 to 150 mm has been practically used. For this reason, the occupied area of the panel is large,
In addition, the equipment protrudes greatly from the panel surface, so that the equipment is large and requires a large installation area. In addition, the structure of the housing is complicated, and many man-hours are required for assembling and the like, and the cost of a mold for molding a synthetic resin is also expensive.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and has a simple structure of a housing, can accommodate a small-sized printed circuit board, can be easily assembled, and can be easily maintained. The purpose is to obtain a PC.

[0005]

SUMMARY OF THE INVENTION A programmable controller according to the present invention comprises a bottom plate and a peripheral wall, a locking hole is provided in each of the peripheral walls on both sides, and a mounting arm for mounting from the peripheral wall to at least two panels. Has a screw hole for fixing the printed circuit board on the front side of the bottom plate,
On the back side, a base provided with a mounting part to the rail, the front plate and the peripheral wall are considerably formed with recesses for exposing the terminal block vertically, and from the inner surface of the peripheral wall on both sides to the opposite side of the front plate. A cover on which a locking piece having a locking claw projecting outward at a tip portion is provided, and a CPU on which electronic components and the like are mounted,
An input / output circuit and the like are formed, and a printed circuit board having a terminal block attached to the upper and lower sides. The printed circuit board is fixed to the front side of the base. A locking claw is fitted and locked in a locking hole of the base, and the terminal block is exposed from a concave portion of the cover.

Further, on both sides of the concave portion provided on the cover, substantially U-shaped locking pieces are provided for locking the terminal block when the cover is mounted on the base. Further, the terminal block attached to the above-mentioned printed circuit board is configured to be detachable.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a plan view of an embodiment of the present invention, FIG. 2 is a side view thereof, FIG. 3 is a bottom view, FIG.
FIG. 5 is an exploded perspective view of FIG. In the figure, 1 is a base, 4 is a printed circuit board fixed to the base 1, and 6 is a cover which covers the printed circuit board 4 and is detachably attached to the base 1. Hereinafter, each of the above members will be described in detail.

The base 1 is composed of a bottom plate 11 and a peripheral wall 12 and is integrally formed of synthetic resin. On the diagonal line, a screw insertion hole 1 for inserting a screw for mounting to a panel is provided.
A mounting arm 13 having a protrusion 4 is provided, and one screw insertion hole 14 is an elongated hole. In addition, this screw insertion hole 1
Four or more mounting arms 13 with four may be provided. Reference numerals 15 denote studs projecting from the four corners on the front side of the bottom plate 11, each having a screw hole 16 for fixing the printed circuit board 4. Reference numeral 17 denotes a locking hole provided on the peripheral wall 12 on both sides, and a locking claw of a locking piece of the cover 6 described later is locked.

Reference numeral 20 denotes a PC provided on the back side of the bottom plate 11.
A rail mounting portion for mounting the mounting concave portion 21 on the rail, having a locking portion 22 at the upper edge portion, a mounting concave portion 21 provided substantially in the lateral direction at a substantially central portion, and a mounting concave portion 2 from the lower edge portion of the mounting concave portion 21.
A mounting recess 23 provided on the same plane orthogonal to 1;
A sliding member 30 is vertically slidably mounted in the mounting recess 23. As shown in FIG. 7, the mounting recess 23 is provided with guide grooves 24 on both side walls, and a wedge-shaped projection 25 having a high mounting recess 21 side is provided substantially at the center of the bottom. Reference numeral 26 denotes a pair of planar triangular stoppers provided on both lower sides of the protrusion 25 so as to face each other with the apex inside.

As shown in FIG. 7, the sliding member 30 is provided on both sides with a sliding portion 31 which fits into the guide groove 24 of the mounting concave portion 23, and the lower surface of the tip is cut off to lock. A part 32 is formed. Reference numeral 33 denotes a hollow portion provided at a central portion, and a resilient substantially C-shaped locking piece 34 having an upper portion integrally formed with an upper edge portion of the hollow portion 33 in the hollow portion 33.
Is provided. Reference numerals 35 and 36 are provided on the rear side, and when the sliding member 30 is mounted on the sliding concave portion 23, the protrusions 25 are provided.
And a relief groove which does not interfere with the stopper 26.

In the rail mounting portion 20 as described above,
When the PC is mounted on the rail, first, as shown in FIG. 8A, the sliding member 30 is slid downward until the upper edge of the hollow portion 33 contacts the projection 25. Thereby, the locking piece 34 is elastically deformed and pressed against the top of the stopper 26,
The sliding member 30 is held in that position. Next, as shown in FIG. 9, the locking portion 23 provided on the upper edge of the mounting concave portion 21 of the base 1 is fitted to one flange 39a of the rail 38, and the bottom portion is in contact with the other flange 39b.

When the sliding member 30 is slid upward as shown in FIGS. 8 (b) and 9, the locking portion 32 provided at the distal end is engaged with the other flange 39b of the rail 38. Stop. At this time, the locking piece 34 returns to the original state and locks on the upper slope of the stopper 26, the sliding member 30 is held at that position, and the PC is securely mounted on the rail 38. P
When removing C from the rail 38, if the sliding member 30 is strongly pulled and slid downward, the locking portion 32 comes off from the flange 39b of the rail 38, so that it can be easily removed.

As shown in FIGS. 5 and 6 (FIG. 6 shows the front side of the printed circuit board 4, that is, the cover 6 side), the printed circuit board 4 is formed in a size that can be attached to the base 1. A CPU, an input / output circuit, and the like are formed by mounting electronic components and the like (not shown). Reference numeral 41 denotes cutouts provided at both ends, and reference numeral 42 denotes a cutout provided in the base 1 corresponding to the screw hole 16. The screw insertion holes 43 are terminal block connection portions provided on the upper and lower sides on the front side, and a plurality of connection pins 44 are protrudingly provided.

Reference numerals 45a and 45b denote terminal blocks to which input / output lines are connected. The terminal block 45a indicates a normal state.
“b” indicates a state where the image is rotated 90 ° from the normal position. Reference numeral 46 denotes a fitting groove provided in the longitudinal direction of the mounting surface and removably fitted to the terminal block mounting portion 43 of the printed circuit board 4, and has a plurality of pin insertion holes (FIG. (Not shown). 47 is a connection port to which an input (or output) wire is connected, and 48 is a set screw for the input (or output) wire. In addition, 49 is a communication connector mounted on the front side of the printed circuit board 4, and 50 is a mode switching switch.

The cover 6 is composed of a front plate 61 and a peripheral wall 62 and is formed integrally with a transparent or partially transparent synthetic resin. The upper and lower peripheral walls 62 have terminal blocks 45a and 45b provided on the printed circuit board 4. Recesses 63a for exposing the
63b are provided, and are formed substantially in an H-shape on the front as a whole. Reference numeral 64 denotes a plurality of locking pieces which have locking claws projecting outward at the distal end thereof and extend rearward (opposite to the front plate) from the inside of the peripheral walls 62 on both sides.
2 and is locked in a locking hole 16 provided in the hole 2.

Reference numeral 65 denotes a substantially U-shaped locking piece having an inclined locking claw at an inner end portion and having elasticity provided on both sides of the concave portion 63. Reference numeral 66 denotes an exposed window of the communication connector 49 mounted on the printed circuit board 4, 67 denotes an exposed window of the mode changeover switch 50, and 68 denotes a ventilation hole for cooling electronic components mounted on the printed circuit board 4.

Next, an example of a procedure for assembling the PC including the base 1, the printed circuit board 4 and the cover 6 as described above will be described. (1) The printed circuit board 4 with the terminal blocks 45a and 45b connected to the terminal block connecting portion 43 is placed on the base 1, and the screws 51 are inserted into the screw holes 42 provided at the four corners of the printed circuit board 4. 16 and fix the printed circuit board 4 to the base 1. After the printed circuit board 4 is fixed to the base 1, the terminal blocks 45a and 45b may be connected to the terminal block connecting portion 43.

Next, the cover 6 is placed on the base 1.
At this time, the terminal blocks 45a, 4
5b is located in the upper and lower recesses 63a, 63b of the cover 6, the communication connector 49 faces the exposure window 66, and the mode changeover switch 50 faces the exposure window 67. When the cover 6 is lowered, the locking claws of the locking pieces 64 are locked in the locking holes 17 provided in the peripheral wall 12 of the base 1, and the cover 6 is mounted on the base 1 with one touch.

At this time, the recesses 63a, 63b of the cover 6
Are provided on both sides of the terminal blocks 45a and 45b, and are elastically deformed. When the cover 6 is mounted on the base 1, the locking pieces 65 return to the original state. 45
a, 45b are locked on the upper surfaces of both ends (see FIG. 1). The communication connector 49 and the mode changeover switch 50 are exposed from the exposure windows 66 and 67 and can be operated from outside.

According to the embodiment, the PC assembled in this manner has a height of 93 mm, a width of 84 mm, and a height of 27 mm.
As a result, the size was significantly reduced as compared with the conventional PC. Also, in assembling, the cover 6 can be attached to the base 1 with one touch without using any screws except for fixing the printed circuit board 4 to the base 1 with screws, thereby simplifying the assembling work and reducing the number of assembling steps. Can be. Furthermore, the terminal blocks 45a and 45b can be attached to and detached from the printed circuit board 4 simply by removing the cover 6, and the printed circuit board 4 can be attached to and detached from the base 1 simply by removing the cover 6, so that attachment and detachment and internal The electric circuit can be easily checked, and the maintenance is extremely easy.

In order to attach the above-mentioned PC to the panel, the bottom plate 11 of the base 1 is brought into contact with the panel 1 and the mounting arm 1
3 may be fixed to the panel by screws inserted into the screw insertion holes 14 provided in the panel 3. In order to mount the PC on the rail, the rail mounting portion 20 provided on the base 1 in the manner described above is used.
Can be operated.

FIGS. 10 to 12 show another example of the present invention. In the example of FIG. 10, when a tall component is mounted on the printed circuit board 4 in the PC of FIG. 12, the ventilation hole 68 is provided, and the printed circuit board 4 and the cover 6 having the same structure as described above are mounted on the base 1.

In the example of FIG. 10, the printed board 4 having a smaller width (width) than that of the PC of FIG. 1 is used, so that the base 1 and the cover 6 are longer than the PC of FIG. It is the same but formed with a narrow width. Further, FIG.
In the example of (1), when there are many control targets, the terminal blocks 45a and 45b need to be large (long), so that the vertical length is the same and the horizontal width is wider than the PC of FIG. In this case, the mounting arms 13 for mounting on the panel are provided at four locations, and the mounting recesses 23 of the rail mounting portion 20 are also provided at two locations.

[0024]

The programmable controller according to the present invention comprises a bottom plate and a peripheral wall, and has a locking hole in each of the peripheral walls on both sides, and mounting arms for attaching to at least two panels are projected from the peripheral wall. On the front side of the bottom plate, there is a screw hole for fixing the printed circuit board, and on the back side, a base provided with a mounting part to the rail, and the front plate and the peripheral wall, considerably to expose the terminal block up and down A recess is formed,
A cover on which a locking piece having a locking claw protruding outward at a distal end portion from the inner surface of each of the peripheral walls on the opposite side of the front plate, an electronic component or the like is mounted, and a CPU, an input / output circuit, etc. Is formed, consists of a printed circuit board with a terminal block attached to the top and bottom, the printed circuit board is fixed to the front side of the base, the cover is fitted with one touch from above and the locking claw of the locking piece is Since the terminal block is mounted by being locked in the locking hole and the terminal block is exposed from the concave portion of the cover, a small-sized printed circuit board having a simple structure can be housed and easily assembled.

A substantially U-shaped locking piece is provided on both sides of the recess provided in the cover to be locked to the terminal block when the cover is mounted on the base, so that the terminal block can be stably held. Can be.

The terminal block mounted on the printed circuit board is
Since the terminal block is detachable, the terminal block can be attached and detached only by removing the cover without removing the printed circuit board, so that maintenance is easy.

[Brief description of the drawings]

FIG. 1 is a plan view of an embodiment of the present invention.

FIG. 2 is a side view of FIG.

FIG. 3 is a bottom view of FIG. 1;

FIG. 4 is a bottom view of FIG. 1;

FIG. 5 is an exploded perspective view of FIG.

FIG. 6 is a front perspective view of the printed circuit board of FIG. 5;

FIG. 7 is an explanatory diagram of a rail mounting portion in FIG. 1;

FIG. 8 is an explanatory diagram of an operation of the rail mounting portion of FIG. 1;

FIG. 9 is an operation explanatory view of the rail mounting portion of FIG. 1;

FIG. 10 is a perspective view of another example of the present invention.

FIG. 11 is a perspective view of another example of the present invention.

FIG. 12 is a perspective view of another example of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Base 13 Mounting arm 16 Screw hole 17 Locking hole 20 Rail mounting part 4 Printed circuit board 42 Screw insertion hole 43 Terminal block mounting part 45a, 45b Terminal block 6 Cover 63a, 63b Recess 64 Locking piece 65 U-shaped locking Piece

Claims (3)

[Claims] The present invention comprises a bottom plate and a peripheral wall, and a locking hole is provided in each of the peripheral walls on both sides, and at least two locking holes are formed from the peripheral wall.
A base provided with mounting arms for mounting to two panels, having a screw hole for fixing a printed circuit board on a front side of the bottom plate, and a mounting portion for mounting to a rail on a rear side; Recesses for exposing the terminal block are formed considerably above and below the peripheral wall, and a locking piece having a locking claw projecting outward at the tip from the inner surface of the peripheral wall on both sides opposite to the front plate protrudes. And a printed board on which electronic components and the like are mounted, a CPU, an input / output circuit, etc. are formed, and a terminal block is attached to the top and bottom, and the printed board is fixed to the front side of the base, The cover is fitted from above, the locking claw of the locking piece is locked and mounted in the locking hole of the base, and the terminal block is exposed from the concave portion of the cover. Programmable controller. 2. The device according to claim 1, wherein a substantially U-shaped locking piece is provided on both sides of the concave portion provided in the cover to be locked to the terminal block when the cover is mounted on the base. Programmable controller. 3. The programmable controller according to claim 1, wherein the terminal block attached to the printed circuit board is configured to be detachable.