JPH0263192A - Electronic control equipment - Google Patents

Abstract

PURPOSE:To mount and dismount each unit on and from a case easily and correctly by inserting the unit into the case from an opening of the case so that a fitting protrusion of a spring board fits in a notch of the case by the bounding force and is fixed an by taking off the unit from the case by pushing buttons on both sides. CONSTITUTION:In a fastening mechanism 32, a notch 70 is made on an edge 35 of surface panels 20, 30 and 40 of input, output and CPU units 2, 3 and 4 for housing a push button 33 and the push button 33 is incorporated in a supporting board 71, which has dovetails 72 projecting from each inner face of the surface panels 20 and 30 which are placed inside of the edge 35, by inserting an installation board 36. At the center of the installation board 36, a curved spring board 37 is formed by cutting off from the installation board 36 while the push button 33 is formed on a free edge. On the spring board 37 just below the button 33, a fitting protrusion 38 is formed. When incorporating the units 2, 3 and 4 into a case 1, the fitting protrusions 38 is fit in a fitting section 1b, which is established on the wall of the case 1, for fixing the units 2 and 3 in the case 1.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to electronic control devices such as programmable controllers, and more specifically, to unit-type input sections, output sections, etc. that constitute the devices, and to electronic control devices such as programmable controllers. It is attached to the mounting structure of the wiring board.

[Prior Art] For example, most cases of programmable controllers are now made of synthetic resin, and these cases include a power supply unit and an input unit that incorporates a specific electrical control circuit. Usually, the required number of units, the required number of output units, and the CPU unit are integrated into one unit, and when setting the control program, the program setting device is connected to the CPU unit via the connection cable. Connect and configure.

[Problems to be Solved by the Invention] The conventional electronic control equipment as described above has the following problems, and an early solution has been desired.

(1) Since set screws are used to install each unit, it takes time to maintain and inspect each unit, and in particular, the input unit and output unit are often removed, making their handling cumbersome. Ta.

(2) As the number of units increases, the case inevitably becomes longer (for example, some cases reach a length of 50 co+). However, since the case is molded from synthetic resin and has a thin wall thickness (generally about 2 to 3 m+w), the central part may warp outward in an arc shape, which is not preferable.

(3) Normally, one motherboard (printed wiring board) is fixed to the bottom of the case to which printed wiring boards installed in each unit are connected, but as mentioned above, the case is made of synthetic resin. It expands and contracts depending on the ambient temperature (for example, in the case of a case with a length of 435 m1, the ambient temperature is 115°C
When the temperature changes by ~65°C, there is an expansion/contraction of ±2 degrees). On the other hand, motherboards are made of materials that are hardly affected by temperature changes, such as glass epoxy resin, so
Changes in temperature can cause the case and the motherboard attached to it to deform and sometimes break.

The present invention has been made to solve the above problems, and is an electronic control device in which each unit can be easily and reliably attached and detached, and each unit and the motherboard are not affected even if the case expands and contracts due to temperature changes. The purpose is to obtain.

[Means for Solving the Problems] The electronic controller according to the present invention is capable of transmitting and receiving signals between a required number of input unit units and a required number of output unit units incorporating specific electric circuits, and a program setting device. A CPU unit and a power supply unit are installed in parallel so that they can be removed into the case from the opening of the case, and a control program setting device is installed in the CPU unit so that it can be removed. In a control device, an engaging protrusion is formed on the outer surface of a leaf spring that always springs outward, and a locking mechanism equipped with a push button that is pressed from the outside to the inside is installed in the input unit and the output unit. A notch is formed on the surface panel of the unit and the CPU unit, and the engagement protrusion of the spring plate engages with the spring plate when the input section unit, output section unit, and CPU unit are inserted through the opening of the case. It is formed on the inner surface of the case.

Furthermore, in the electronic controller described above, a substantially C-shaped hook is inserted between the units incorporated in the case, and the engaging parts provided above and below the hook are engaged with the upper and lower edges of the opening of the case. Further, in the control device, the boss provided at the bottom of the case is fitted into a through hole provided on the motherboard, and the boss provided on both sides of the boss is fixed. A tall boss is slidably fitted into a long hole provided on the motherboard.

[When the working unit is inserted through the opening of the case, the engaging protrusions of the spring plate will engage and be fixed in the notch of the case due to their elastic force. Also, when taking out the unit from the case, By pressing the push button, the engagement is released and it can be pulled out.

Furthermore, by engaging the engaging portions of the hooks with the upper and lower edges of the case, it is possible to prevent the case opening from warping.

Furthermore, the center of the motherboard is fixed to the case, and both sides of the motherboard are slidably attached to the case.
Even if the case expands or contracts due to changes in ambient temperature, the motherboard will not be affected.

[Embodiment of the invention] Fig. 1 is a perspective view showing an embodiment of the invention, and Fig. 2 is a perspective view showing an embodiment of the invention.
FIG. 2 is a perspective view of the main parts with a portion of the figure removed. In these figures, each unit is formed to a specific size, so the required number of input units 2, 2, output units 3, 3, and power supply units 5 are attached to case 1 with an open front. After that, there is a CP having a connection section 41 for transmitting and receiving signals with a control program setting device 6, which will be described later.
It is constructed by attaching a control program setting device (hereinafter simply referred to as a setting device) 6 to the upper surfaces of the U unit 4 and the power supply unit 5.

In addition, each surface panel 20, 30, 40, 50, 80 of the case 1, each unit 2, 3, 4.5, and setting device 6 is molded from synthetic resin, and each surface panel is equipped with the necessary electrical parts,
As shown in part in FIG. 2, printed wiring boards 31 incorporating necessary electric circuits are attached to each of them. In addition, in order to attach each surface panel 20° 30 to the case 1, the printed wiring board 31 is engaged with the engagement groove (12 in Fig. 5) installed in the vertical direction on the internal side surface of the case 1, and then A card edge 31a formed on a part of the wiring board 31 is connected to a connector 91 provided on a motherboard (9 in FIG. 7) provided in the case 1 to construct a necessary control circuit.

The power supply unit 5 is fixed to the case l with screws 51 as shown in FIG. Locking mechanism 32 provided on the side wall of Go. (Push button 3 to enable it to be locked to the case 1 and to operate the locking mechanism 32.61
3.62 for each surface panel 20.30.40. (They are provided to protrude from the side walls of the io.

As will be explained in detail later, the locking mechanism 32 is configured so that it always springs outward due to its own elasticity. When engaged, the locking mechanism 32 elastically engages with a predetermined engagement portion 1b formed in the notch 1a of the case 1, and to release the engagement, the push button 33 is turned inward from the outside. The locking mechanism 32 protruding outward is retracted inward by pressing the locking mechanism 32, and is disengaged from the engaging portion 1b of the case 1 and pulled upward, thereby attaching each unit 2, 3.4 to the case. 1
It can be removed from.

The locking mechanism 61 and push button 62 of the setting device 6 are also similar to the locking mechanism 32 and push button 33 described above, but in the case of this locking mechanism 61, The setting device 6 is configured to be inserted into the engagement hole 52, and the setting device 6 has a surface panel 60 with various types of holes 63,
In addition to various electrical parts that correspond to the display window 64 that displays the program and sequence status, a necessary connector edge 65 is provided on the back side, so that the locking mechanism 61 of the setting device 6 can be connected to the power supply unit 5. When inserted and locked into the engagement hole 52, the connector edge 65 is inserted into the CP
It is inserted into the connector 41 of the U unit 4 to connect the setting device 6 and the electric circuit inside the case 1.

Incidentally, as shown in FIG. 7, the case 1 includes a printed circuit board 10 to which the CPU unit 4 is connected and a connector 10a.
, a connector lOc for enabling electrical connection with the flexible substrate 10b1 and other similar electronic control equipment.
, lOd are provided on the side of the case 1. 10
e, lOf is the connector 10c.

This is a through hole formed corresponding to the installation position 10d, and is for passing a connector cable through when connecting to other electronic control equipment.

When the case 1, each unit 2, 3.45, and each surface panel 20.30.40.50.60 of the setting device 6 are molded from synthetic resin as described above, the locking mechanism 32□61 is attached to each surface. It is difficult to form it integrally with the panel. For this purpose, each locking mechanism 32.81 is adapted to be attached to each front panel 20.30.40.60, respectively.

3 and 4 are perspective views showing an example of the locking mechanism 32.61. First, the locking mechanism 32 shown in FIG.
A notch 70 for accommodating the push button 33 is provided at the end 35 of 0.30.40, and the push button 33 is placed in the notch 70, and each surface panel 2 at a position inside the end 35
The mounting plate 36 is inserted and assembled into a support plate 71 having a dovetail groove 72 protruding from the inner surface of the support plate 71. In addition, in order to improve the elasticity of the push button 33, a curved spring plate 37 cut out from the mounting plate 36 is provided at the center of the mounting plate 36 (an example is shown in which the spring plate 37 is integrally formed with the mounting plate 36 from synthetic resin). ) is formed. Further, a push button 33 is formed at the free end of this spring plate 37. An engagement protrusion 38 is formed on the spring plate 37 directly below the push button 33, and this engagement protrusion 38 connects the units 2, 3.4 to the case 1.
When assembled into the case 1, the units 2 and 3 are elastically engaged with an engaging portion 1b provided on the wall of the case 1, and the units 2 and 3 are engaged and fixed to the case 1.

In order to prevent the mounting plate 36 assembled into the support plate 71 from falling off the support plate 71, an engaging protrusion 39 is provided on the back surface of the base of the spring plate 37 of the mounting plate 36, and the mounting plate 3G is inserted into the dovetail groove 72. When it is slid and assembled, the engagement protrusion 39 slides along the support plate 71, and when the mounting plate 36 reaches a predetermined position, the engagement protrusion 39 engages with the fitting recess 73 provided in the support plate 71. do. At this time, the push button 33 is housed in the notch 70. Note that this locking mechanism 32 is similarly adopted as a locking mechanism of the connection unit 4.

FIG. 4 shows a locking mechanism 61 of the setting device 6. This locking mechanism 61 has a notch 68 formed in the side wall B7 of the setting device 6, the size of which allows the push button 62 to fit. Projections 69, 69 having dovetail grooves 6B, 6B formed on the inner surfaces of the side walls on both the left and right sides are provided, and the push button mounting plate 75 is fitted and attached between the projections 89, 69.

The left and right sides of the push button mounting plate 75 are formed in a dovetail shape 75a, and the center of the push button mounting plate 75 is formed into a dovetail shape 75a.
A spring plate 76 is cut out from the spring plate 5 and integrally formed with the push button 62 from synthetic resin, and is formed so as to extend from the upper side of the push button mounting plate 75. An engaging protrusion 78 is provided. When this engaging protrusion 78 is inserted and assembled into the engaging hole 52 of the power supply unit 5 shown in FIG. The device 6 is held on the power supply unit 5 as shown in FIG.

The push button mounting plate 75 has a dovetail groove 6B with a protrusion 89.09,
In order to prevent the button from falling between the protrusions 69 and 69, an engaging protrusion 77 is provided on the push button mounting plate 75. The engaging protrusion 77 is designed to engage with a groove 87a formed on the inner surface of the side wall 67 of the setting device 6 when the push button mounting plate 75 is assembled between the protrusions 89 and 89.

FIG. 5 is a perspective view of another embodiment of the invention.

In this embodiment, the center of the opening of the long case 1 made of synthetic resin is curved outward and deformed into an arc shape, thereby preventing each unit, especially the unit near the center, from falling off the case 1. Therefore, a hook 8 is installed between the units 2 and 3 near the center of the opening. As shown in FIG. 6, this hook 8 is a thin plate with approximately C.
The engaging portions 81.81a are formed in the shape of a letter, and the length g between the engaging portions 81.81a is equal to the height h between the edges 11 of the opening of the case 1. This is what I did.

Such a hook 8 is inserted between the units 2 and 3 at approximately the center in the length direction of the case 1, and is inserted into the engaging portion 81.
81a is engaged with the edge 11 of the opening, thereby preventing the opening of the case 1 from warping.

Note that a plurality of hooks 8 may be attached in the length direction depending on the size of the case 1.

FIG. 7 is a plan view showing still another embodiment of the present invention. As mentioned above, since the case 1 is made of synthetic resin, it expands and contracts as the ambient temperature changes, but the motherboard 9, which is fixed to the bottom of the case and to which the printed wiring boards 31 of each unit 2.3 are connected, does not change due to temperature changes. On the other hand, since it hardly expands or contracts, if the case 1 expands or contracts, the case 1 or the motherboard 9 will be deformed or damaged.

Therefore, in the present invention, as shown in FIG. 8(a),
A two-stage boss 14 consisting of a large-diameter portion 15 and a small-diameter portion 16 is provided protruding approximately at the longitudinal center of the portion of the bottom plate 13 of the case 1 where the motherboard 9 is attached, and a two-step boss 14 consisting of a large diameter portion 15 and a small diameter portion 16 is provided on both sides thereof at appropriate intervals. As shown in FIG. 8(b), the large diameter portion 15 of the boss 14
A two-stage boss 17 consisting of a large diameter part 18 having the same height as that of the main body and a small diameter part 19 which is higher than the small diameter part 16 is provided in a protruding manner. On the other hand, the motherboard 9 is provided with a through hole 92 that fits into the boss 14 at a position corresponding to the boss 14, and a long hole 93 that is long in the horizontal direction is provided at a position that corresponds to the boss 17. Then, the through holes 92 of the motherboard 9 are fitted into the bosses 14, and the elongated holes 93 are fitted into the bosses 17, respectively.
Screw bolts 94°95 into holes 7.

As a result, the central part of the motherboard 9 is fixed to the boss 14 by the bolt 94, while the both sides are free with respect to the case 1. As the case 1 expands and contracts, the bolt 95 is inserted into the elongated hole 94. the motherboard 9, and does not affect the motherboard 9 at all.

Therefore, the motherboard 9 is always held in a fixed position,
Case 1 and the motherboard will not be distorted or damaged.

[Effects of the Invention] As described above, the electronic control device according to the present invention has an engaging protrusion formed on the outer surface of the leaf spring that always springs outward, and
A locking mechanism equipped with a push button for pressing from the outside to the inside is assembled into a human power unit, an output unit, and a C.
It is formed on the front panel of the PU unit, and when the input section unit, output section unit, and CPU unit are inserted through the opening of the case, the engagement protrusion of the spring plate engages with the notch by its elastic force. Since it is formed on the inner surface of the case, when installing the input unit, output unit, or CPU unit, you can simply push it in through the opening of the case, and when removing it, pinch the push buttons on both sides with your thumb and middle finger. This can be done by pressing the button, disengaging it, and pulling it out, so it can be attached and detached with a single touch. Therefore, there is an advantage that maintenance and inspection of the electric circuits included in each unit can be performed quickly.

Further, the present invention provides that at least one location along the length of the case has approximately C.
By inserting a letter-shaped hook and engaging it with the upper and lower edges of the case, even if the case is long, there is no risk of the central part warping and deforming into an arc shape, making it easy to attach and detach the attached unit. There's nothing to do.

Furthermore, the motherboard installed at the bottom of the case is fixed to the case at approximately the center in the longitudinal direction, and is slidably attached to the case on both sides, so even if the case expands or contracts due to temperature changes, the motherboard will remain intact even if the case expands or contracts due to temperature changes. is not affected by this, so there is no risk of deformation or damage to the case or motherboard, which is a great benefit.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing one embodiment of an electronic control device according to the present invention, FIG. 2 is a perspective view of the main part with a part of FIG. 1 removed, and FIGS. FIG. 5 is a perspective view showing another embodiment of the present invention; FIG. 6 is a perspective view of an example of a hook used in the embodiment shown in FIG. FIG. 7 is a schematic plan view for explaining still another embodiment of the present invention, and FIGS. 8(a) and 8(b) are enlarged sectional views of essential parts thereof. In the figure, 1 is a case, 1a is a notch, 1b is an engaging part, 2 is an input section unit, 3 is an output section unit, and 4 is a CP
U unit, 5 is a power supply unit, 6 is a control program setting device, 8 is a hook, 9 is a motherboard, 11 is an edge,
14.17 is the boss, 20.30°40, 50.80 is the front panel, 10.31 is the printed wiring board, 32.61
is the locking mechanism, 33.35 is the end, 36 is the mounting plate, 3g,
39.77, 78 are engagement protrusions, 41 is a connector, 52
, 73 is an engagement hole, 52a is an engagement portion, 76 is a spring plate, 65
is the connector edge, 86.72 is the dovetail groove, 67 is the side wall, 6
7a is a groove, 68.70 is a notch, 71 is a support plate, 75
75a is a dovetail shape, 81.81a is an engaging portion, 93 is an elongated hole, and 94.95 is a screw.

Claims (3)

[Claims] (1) A CPU unit having a required number of input units incorporating a specific electric circuit, a required number of output units, and a connection unit for exchanging signals with a program setting device;
In an electronic control device in which a power supply unit and a power supply unit are installed in parallel so that they can be removed into the case from an opening of the case, and a control program setting device is made removable from the CPU unit, An engaging protrusion is formed on the outer surface of the leaf spring, and a locking mechanism equipped with a push button for pressing from the outside toward the inside is formed on the surface panel of the input section unit, the output section unit, and the CPU unit. Further, when the input section unit, the output section unit, and the CPU unit are inserted through the opening of the case, a notch is formed in the inner surface of the case, with which the engagement protrusion of the spring plate engages with its elastic force. Characteristic electronic control equipment. (2) A substantially C-shaped hook is inserted between the units incorporated in the case, and engaging portions provided above and below the hook are engaged with the upper and lower edges of the opening of the case. The electronic control device according to claim 1, characterized in that: (3) The through hole provided on the motherboard is fitted into the boss provided approximately at the center of the length of the bottom of the case to secure the case, and the boss provided on the motherboard is provided on both sides of the boss higher than the boss provided on both sides of the case. 2. The electronic control device according to claim 1, wherein the elongated hole is slidably fitted into the elongated hole.