JP3434974B2 - I / O unit structure in numerical controller - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to improvement of I / O unit structure in a numerical controller.

[0002]

2. Description of the Related Art As a method of mounting an I / O unit on a distribution board, a method of screwing a casing of the I / O unit directly to the distribution board or an I / O unit mounted on a DIN rail installed on the distribution board is used.
A method is known in which a through groove provided in the casing of the / O unit is fitted to fix the both.

According to the method of screwing the casing of the I / O unit directly to the distribution board, the I / O unit can be mounted in a narrow space, but many screws are required. Therefore, it is difficult to attach and detach the I / O unit. On the other hand, with the configuration using the DIN rail and the through groove, the I / O unit can be easily attached and detached without using screws, but because the DIN rail is placed on the distribution board side, both sides of the casing are installed. It requires a certain amount of free space, and it is not always possible to deploy various electrical components in a densely packed form.

Since each of them has advantages and disadvantages, a screw type I / O unit is used or a DIN rail type I / O unit is used.
Whether or not to use the O unit depends on the final design concept, but the structure of the I / O unit must be changed accordingly. As a practical matter, the shape of the casing itself does not differ significantly even if the installation concept is different, it is just a minor change, but since the final product shape is different, two production lines are required and The manufacturing cost tends to increase.

Further, in the conventional I / O unit, since the distribution board side and the I / O unit are always connected via the extension cable, the extension cable and the extension from the external device are started. There is also a problem that the distribution board is crowded with cables and the like.

[0006]

SUMMARY OF THE INVENTION It is an object of the present invention to address multiple mounting methods in a single configuration,
Another object of the present invention is to provide an I / O unit structure in a numerical control device that can reduce the congestion of cables on the distribution board.

[0007]

According to the present invention, a terminal for connecting to a connector on a distribution board side is provided on a first surface of a rectangular parallelepiped casing containing a circuit for data input / output, and the terminal is provided on the distribution board. and engaging means for engaging the locking means is provided with, the
The second surface parallel to the first surface has a through hole that fits with the mounting rail.
Through hole and screw fastening hole for directly fixing the casing
And a terminal for connecting to a connector provided at the end of another extension cable is provided on the third surface, and each of the terminals is electrically connected through the data input / output circuit. The above object has been achieved by the characteristic constitution.

[0008] With the above configuration, to maintain compatibility with the mounting method of the past, further, with respect to the distribution board that conforms to the I / O unit structure, as unnecessary intervention extension cable, electrical And mechanical connection can be achieved at the same time. The omission of the extension cable between the I / O unit and the distribution board leads to the relief of the congestion of the cables on the distribution board.

Further, by providing a screw fastening hole for directly fixing the casing on one surface of the polyhedron casing having no terminals, it is possible to deal with the conventional mounting method by screwing.

Further , the second surface parallel to the first surface is mounted.
To fix the through groove that fits the mounting rail and the casing directly
Mounting structure by providing a screw fastening hole for
Expanded the freedom of choice.

[0011]

DETAILED DESCRIPTION OF THE INVENTION An embodiment of the present invention will be described below with reference to the drawings. 1 and 2 are perspective views showing the appearance of a casing 1 of an I / O unit according to an embodiment to which the structure of the present invention is applied.

1 and 2, the same casing 1 is shown, but in FIG. 1, exclusively, a through groove 3 for fitting with a DIN rail 2 and a screw fastening hole 4 for direct fixing are provided. With respect to the surface 1a, in FIG. 2, the terminal group 7 connected to the connector 6 on the distribution board 5, and the engagement pieces 10 engaged with the holes 8 and 9 as the locking means on the distribution board 5. , 11 on which the surface 1b is provided.

As shown in FIGS. 1 and 2, the casing 1 of this embodiment is formed in a flat rectangular parallelepiped shape as a whole, and has an outer peripheral surface 1a formed by covering left and right side surfaces 1c and 1d and an outer peripheral portion thereof. , 1b, 1e, 1f.

As shown in FIG. 2, a rectangular notch 12 for internally fitting the connector 6 mounted on the distribution board 5 is formed at the center of the surface 1b of the casing 1, and the notch 12 is formed.
A terminal group 7 that is electrically connected to the terminal group of the connector 6 is arranged at a position inwardly retracted from the surface of the surface 1b by the thickness of the connector 6.

Further, an L-shaped engaging piece 10 whose tip is bent inward is provided integrally with the casing 1 at the upper end of the surface 1b, and at the position of the lower end of the surface 1b. An engaging piece 11 having a wedge-shaped projection 13 protruding outwardly at its tip is integrally provided with the casing 1.

The rising of the flexible arm 14 of the engaging piece 11 is not on the surface 1b but on the surface 1f, which is also the surface 1b and the surface 1.
A position far away from the contact portion with f (step A in the figure
Above), the span of the flexible arm 14 of the engaging piece 11 is provided with sufficient span for elastic deformation.

The engaging pieces 10 and 11 are engaging means for connecting to the holes 8 and 9 on the distribution board 5.

The vertical width of the hole 8 which is one of the locking means on the distribution board 5 is slightly wider than the vertical width of the tip of the engaging piece 10, so that the tip of the engaging piece 10 is easy. It is possible to rush into the hole 8. In addition, the connector 6 on the distribution board 5
The positional relationship of the hole 8 with respect to the distance between the lower edge 8a of the hole 8 and the tip of each terminal of the connector 6 is determined by the relationship between the inner corner 10a of the engaging piece 10 and the lower edge 8a of the hole 8. The distance from the inner corner portion 10a of the joint piece 10 to the tip of each terminal of the terminal group 7 is adjusted so as to be completely the same.

Therefore, the terminals of the connector 6 and the terminals of the terminal group 7 can be securely secured only by crimping the casing 1 to the distribution board 5 with the engaging piece 10 hooked on the lower edge 8a of the hole 8. Can be positioned and joined.

Generally speaking, regarding the detaching work of the connectors, it is correct to carry out the detaching work by applying a tensile or compressive force along the axial direction while keeping the parallel state of both terminals. As far as this embodiment is concerned, the distance between the hole 8 and the connector 6 and the engagement piece 1
The distance between 0 and the terminal group 7, that is, the radius of gyration of the movement trajectory of the tip of the terminal group 7 is formed to be much longer than the effective length of the terminal itself. Even if the terminal is attached and detached by dynamic operation, there is no problem such as disconnection or breakage due to bending or biting of the terminal.

On the other hand, as for the position of the hole 9 which is the other locking means on the distribution board 5, the casing 1 is shaken with the inner corner 10a of the engaging piece 10 being crimped to the lower edge 8a of the hole 8. It is adjusted so that the inclined surface portion of the wedge-shaped projection 13 of the engagement piece 11 on the casing 1 side abuts the lower edge 9a of the hole 9 when the lower end portion is moved and pressed against the distribution board 5.

The slope portion of the wedge-shaped projection 13 is the lower edge 9a of the hole 9.
When the lower end portion of the casing 1 is further pressed against the distribution board 5 in a state of contacting with, the flexible arm 14 of the engaging piece 11 is bent, and the slanted surface portion thereof is slidably contacted with the lower edge 9a, The wedge-shaped protrusion 13 projects into the hole 9. Then, when the connection between the connector 6 and the terminal group 7 is completed and the wedge-shaped projection 13 completely penetrates the hole 9, the flexible arm 14 elastically returns to its original shape, and the rising portion of the wedge-shaped projection 13 becomes a hole. The casing 1 is fixed by catching on the lower edge 9a of the casing 9.

That is, the engaging piece 10 has a hole 8 in the distributor 5.
And a function of preventing the casing 1 from being laterally displaced with respect to the distribution board 5, and a function of preventing the upper end of the casing 1 from being separated from the distribution board 5. The engaging piece 11 has a function of preventing the lower end portion of the casing 1 from being displaced laterally with respect to the distribution board 5, and prevents the lower end portion of the casing 1 from being separated from the distribution board 5. There is a function to do.

Therefore, as long as the casing 1 is suspended and mounted on the distribution board 5 in the normal mounting direction as shown in FIG. 1, there is no force for shearing the terminals between the connector 6 and the terminal group 7. Does not work.

When the casing 1 is attached to the distribution board 5 in an irregular manner, for example, the casing 1 is turned upside down and attached to the distribution board 5, or the casing 1 is attached to the distribution board 5. In the case where it is necessary to perform another cable attachment / detachment work in this state, a force that pushes up the casing 1 from the bottom to the top may act in the direction of FIG. In the case where the casing 1 is mounted on the distribution board 5, the overall size is adjusted so that the lower surface 15a of the base 15 that serves as the mounting base of the connector 6 comes into close contact with the wall surface 12a of the notch 12 on the casing 1 side. Therefore, the force that pushes up the casing 1 from the bottom to the top is supported by the contact surface between the base 15 and the notch 12, and it is possible to sufficiently withstand such a force.

When removing the casing 1 from the distributor 5, the hand is extended to the rear side of the distributor 5 to lift the wedge-shaped projection 13 of the engaging piece 11 to remove it from the hole 9, and the engaging piece 11 is separated. After pulling out from the board 5, the entire casing 1 is slid upward so that the locking piece 10 is pulled out from the hole 8. Further, as described above, since the flexible arm 14 of the engagement piece 11 has a sufficient span, the flexible arm 14 can be moved to the rear side of the distribution line board 5 without the need to turn the hand. It is possible to remove the casing 1 by releasing the engagement between the wedge-shaped projection 13 and the lower edge 9a of the hole 9 simply by pressing the finger against the main body of the casing 1.

As shown in the example of FIG. 1, if the distribution board is constructed corresponding to the casing 1 of the embodiment, that is, the distribution board 5 in which the connector 6 is mounted and the holes 8 and 9 are provided. , Fig. 2
The mechanical connection between the distribution board 5 and the casing 1 and the electrical connection between the connector 6 of the distribution board 5 and the terminal group 7 of the casing 1 are simultaneously achieved without using the extension cable 22 as shown in FIG. Therefore, as much as the extension cable 22 does not intervene, the congestion degree of the extension cable near the distribution board can be alleviated as compared with the conventional connection method.

The through groove 3 serving as the second mounting means and the screw fastening hole 4 serving as the third mounting means are shown in FIG.
As shown in, the casing 1 is provided on the surface 1a parallel to the surface 1b on which the terminal group 7 is provided.

The width of the through groove 3 is DI fixed to the distribution board side.
The upper side wall 3a is formed to have a size substantially equal to the vertical width of the N rail 2, and a reverse taper-shaped slope that fits the upper edge of the DIN rail 2 is formed, while the lower side wall 3b is formed. ,
In order that the through groove 3 can be freely engaged with and disengaged from the DIN rail 2,
An outer open slope is formed. Further, on the upper part of the through groove 3, there is formed a projection 3c for sandwiching the upper edge of the DIN rail 2 with the side wall 3a (see FIG. 3). Furthermore,
On the side wall 3b side, a locking claw 16 for fixing the lower edge of the through groove 3 to the lower edge of the DIN rail 2 with the side wall 3a hooked on the upper edge of the DIN rail 2 is provided. It is provided integrally.

The locking claw 16 is a notch 20 of the casing 1.
A flexible arm 17 provided inside, a wedge-shaped projection 18 formed on the upper surface of the tip portion thereof, and a notch 1 for tool hooking integrally formed on the lower surface of the tip portion of the flexible arm 17.
9, the flexible arm 17 has a span sufficient for elastic deformation, like the engaging piece 11 described above. The relationship of the wedge-shaped projections 18 with respect to the lower edge of the DIN rail 2 is that the engagement piece 1 with respect to the lower edge 9a of the hole 9 in the dividing line board 5 is.
This is the same as the relationship of the wedge-shaped projection 13 of 1.

The locking claw 16 may be completely integrated with the casing 1 made of synthetic resin (plastic),
Alternatively, only the locking claw 16 may be separately configured and attached to the casing 1 in a nested manner. For example, a slit is provided in a portion 21 of the casing 1 shown in the drawing,
It is possible to press-fit and attach the base of the flexible arm 17 of the locking claw 16 to this portion. It should be noted that the casing 1 itself is a plastic molded product having a left-right two-part configuration, and a circuit board for data input / output is sandwiched inside the casing 1 to form concavo-convex fittings provided on the mating surfaces of both main bodies that are divided into two parts. It is assembled together by the joint, and no screws for assembly are used.

When the casing 1 is mounted on the DIN rail 2 on the distributor by utilizing the through groove 3, first, the through groove 3 is used.
The side wall 3a of the casing is hooked on the upper edge of the DIN rail 2, and then the lower end of the casing 1 is pressed against the DIN rail 2 so that the wedge-shaped projection 18 of the locking claw 16 is attached to the DIN rail 2.
So that it engages with the lower edge of.

In addition, when removing, a tool such as a flat-blade screwdriver is inserted into the notch 19 for hooking the tool of the locking claw 16 and the flexible arm 17 is pulled down from above to make the wedge-shaped projection 18 DIN. After separating from the lower edge of the rail 2 and pulling the lower end of the casing 1 away from the DIN rail 2, the side wall 3a of the through groove 3 is pulled out from the upper edge of the DIN rail 2 by sliding the entire casing 1 upward. To do. The gap between the lower end of the tool catching notch 19 and the bottom 20a of the notch 20 is sufficient to pull down the wedge-shaped projection 18 and separate it from the lower edge of the DIN rail 2. The work of removing the wedge-shaped projections 18 can be easily performed, and moreover, the flexible arm 1
7 bends to the maximum extent allowed by the gap, and the lower end of the tool hooking notch 19 is the bottom 20 of the notch 20.
Since the span and the material of the flexible arm 17 are adjusted so that the bending amount of the flexible arm 17 falls within the elastic deformation range even when it hits a, the flexible arm 17 may be broken or buckled. It is possible to reliably prevent damage.

When the casing 1 is mounted on the DIN rail 2, the upper edge and the lower edge of the DIN rail 2 are both through-grooves 3.
Since the side walls 3a and 3b of the casing 1 come into close contact with the base corner portions thereof, the casing 1 can withstand both the load from above and the force acting by pushing up from below.

Further, the slope of the side wall 3a and the projection 3c are DIN
Since the upper edge of the rail 2 is elastically sandwiched, DIN
The lateral displacement of the casing 1 with respect to the rail 2 can be suppressed. That is, strictly speaking, the side wall 3a is hooked on the uppermost edge portion of the DIN rail 2 and the DIN rail 2
The height of the protrusion 3c is adjusted so that a certain amount of gap is generated between the lower edge of the DIN rail 2 and the lower edge of the through groove 3 when the tip of the protrusion 3c is in contact with the surface of the upper edge of the protrusion 3c. Further, from this state, the wedge-shaped projection 18 of the locking claw 16 is D
When the lower end of the casing 1 is pressed against the DIN rail 2 to a position where it engages with the bottom edge of the IN rail 2, the through groove 3
Is a concave bend, specifically, a bend that deforms the through-groove 3 into a right-opening bracket "(" shape in FIG. 3, and the repulsive force due to this elastic deformation and the side wall 3a, the protrusion 3c, and the wedge-shaped protrusion 18 are generated.
The three-point support by means that the casing 1 is fixed to the DIN rail 2 so as not to laterally shift.

The locking claw 16 is only required to prevent the side wall 3b of the through groove 3 from separating from the lower edge of the DIN rail 2.

When the casing 1 is mounted on the distribution board side by using the DIN rail 2, the casing 1 and the distribution board are not electrically coupled with each other, and therefore the extension cable 22 from the distribution board 22 is used. It is necessary to connect the connector 23 provided at the end of the to the terminal group 7 of the casing 1. Of course,
The pin arrangement of this connector 23 is the same as that of the connector 6 described above.

Screw fastening hole 4 serving as a third mounting means
Is provided by being punched in a flange portion 24 projecting from the outer peripheral portion of the surface 1a of the casing 1, and is screwed from the casing 1 side through a tapping screw or the like into a screw hole on the distribution board side to form a casing. 1 can be directly attached to the distributor. The tip of the locking claw 16 is the surface 1 of the casing 1.
Since it is provided so as to be flush with a or to be retracted from that, it does not interfere with screwing, and if there is a space for superimposing the surface 1a of the casing 1 on the surface of the distribution board, screwing is possible. With this, the casing 1 can be easily attached. Of course, even if there are no screw holes, tapping screws can be easily drilled on the surface of the splitter board by post-processing with a hand drill, etc., if there is a suitable space. Even when the casing 1 is fixed directly to the distributor with screws,
Similarly to the above, since the casing 1 and the distribution board are not electrically connected by themselves, the connector 23 provided at the end of the extension cable 22 from the distribution board is connected to the casing 1 by itself.
Need to be connected to the terminal group 7.

The surface on which the screw fastening hole 4 is provided and the surface on which the through groove 3 is provided do not necessarily have to be on the same surface, but by providing these on the same surface, the remaining two surfaces on the casing 1, that is, On the surfaces 1e and 1f, it is possible to arrange a large number of terminal groups 25a and 25b for extension cables used for connection with an external device and terminal groups for extension cables 26a and 26b.

[0040]

According to the I / O unit structure of the present invention,
Since a single casing structure can handle mounting rails, screws, and even dedicated mounting structures, the user is free to select a mounting structure that suits their needs from these mounting structures. O-unit installation work can be performed. In particular, when a dedicated mounting structure is applied, an extension cable for connecting the distribution board and the I / O unit is not needed, so that congestion of the extension cable on the distribution board can be alleviated. Also, the manufacturer does not need to divide the production line depending on the mounting structure, and the manufacturing line can be unified for the casing of the I / O unit to reduce the manufacturing cost, so various mounting methods are possible. The I / O unit can be provided at a low price.

[Brief description of drawings]

FIG. 1 is a perspective view showing an appearance of a casing of an I / O unit according to an embodiment to which a structure of the present invention is applied.

FIG. 2 is a perspective view showing the outer appearance of the casing of the I / O unit of the same embodiment from another angle.

FIG. 3 is a diagram showing a simplified state of engagement between a through groove and a DIN rail.

[Explanation of symbols]

1 I / O unit casing 1a Surface 1b provided with through groove and screw fastening hole 1b Surface provided with terminals for connecting to connector of distribution board and engaging means 1c Left side surface 1d Right side surface 1e Outer peripheral surface 1f Outer peripheral surface 2 DIN rail 3 Through groove 3a Side wall 3b Side wall 3c Protrusion 4 Screw fastening hole 5 Distribution board 6 Connector fixed to distribution board 7 Terminal group 8 hole (locking to connect to connector fixed to distribution board) Means) 8a Lower edge 9 Hole (locking means) 9a Lower edge 10 Engagement piece (engagement means) 10a Inner corner 11 Engagement piece (engagement means) 12 Cutout 12a Wall surface 13 Wedge-shaped projection 14 Flexible arm 15 Base 15a Lower surface 16 Locking claw 17 Flexible arm 18 Wedge-shaped projection 19 Tool catching notch 20 Notch 20a Bottom 21 (slit) 22 Extension cable 23 Connector 24 Flange 25a Terminal group 25b Terminal group 26a extension cable 26b extension cable

─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-5-88726 (JP, A) JP-A-63-88605 (JP, A) Fukukaihei 6-30802 (JP, U) (58) Field (Int.Cl. ⁷ , DB name) G05B 19/18-19/46 B23Q 15/00-15/28 H05K 7/02-7/10

Claims (2)

(57) [Claims] 1. An I / O unit structure for a numerical control device, which has a rectangular parallelepiped casing containing a data input / output circuit, wherein the casing has a first surface and a terminal connected to a connector on a distribution board side. When, an engagement means for engaging the locking means provided in the partial lines platen provided, the first parallel to the plane second face, the through grooves and said to be fitted with the mounting rail Fastening screws to fix the casing directly
A hole for use is provided, a terminal for connecting to a connector provided at the end of another extension cable is provided on the third surface, and each of the terminals is electrically connected through the data input / output circuit. An I / O unit structure in a numerical controller characterized by the above. 2. The numerical controller according to claim 1, wherein a screw fastening hole for directly fixing the casing is provided on one of the faces of the casing where the terminal is not provided. I / O unit structure.