JPS5946718A - Method of adjusting automatic assembling of contact member - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for automatically assembling a contact member in order to keep the contact pressure constant and the stroke required to open the contact constant in a device having electrical contacts. It is.

Important quality items when assembling relays, limit switches, magnetic throat switches, etc. are to maintain a constant contact point when the contact is closed, and to maintain the stroke required to open the contact ( In some cases, the amount of displacement of a moving member is kept constant in order to

Conventionally, after assembling the relay parts, the contact pressure and the stroke were manually measured and corrected alternately and repeatedly. This adjustment took a lot of time and was considered a big problem.

In particular, when driving the terminal into the base, there is a problem in that the driving dimensions vary due to springback (return due to the elasticity of the object) that is typical of this type of driving work.

It is an object of the present invention to provide a method for automatically and quickly adjusting this type of contact pressure and stroke.

An example will be described below. In this embodiment, the structure of a relay as a product is shown in FIGS. 1 and 2.

2 is a first terminal made of metal, and 2 is a second terminal, which are press-fitted (implanted) into a slit formed in the base 3 made of resin. 4 is an armature made of spring material and connected to the first terminal 1; 5 is a movable contact that is coupled to the armature 4, and 6 is a fixed contact that is coupled to the second terminal 2.

7 is a plunger whose one end is in contact with the core 9, and is moved upward by the magnetic force of the coil 8 (Fig. 1 shows the plunger when the contact is ON).
state), and is pushed out by the spring 10 (Fig. 2 shows the contact OFF state).

In the state shown in FIG. 1, the movable contact 5 and the fixed contact 6 are in contact with a constant force due to the restoring force of the armadure 4. Also, at this time, the protrusion 1 formed between the plunger and armadure 4
1 (integrated with Armadure 4) there is a certain gap a
(same as the previous stroke) is required. In order to make this stroke a constant, dimension 5, which is the sum of the distance C of the tip of the plunger 7 relative to the base 3 (which can be easily made constant) and the stroke a, must be kept constant.

Next, in the state shown in Fig. 2, the excitation 1 of the coil 8 is ψJ,
The plunger 7 pushes down the spring 6 and the protrusion 11 by the spring 10 to open the contact points 5 and 6. At this time, in order to ensure that the contact opens, the [)" method at the moment the contact separates, that is,
The positional dimension of the plunger 7 with respect to the base 3 and the force W applied to the protrusion 11 at the moment when the contact points are separated must be constant values.

Note that the five dimensions shown in FIGS. 1 and 2 indicate one dimension between the upper end 3a of the base 3 and the protrusion 11, and 1] is a variable.

In order to obtain the above group (=J condition, apply a load to the protrusion 11 and set the 5 dimensions at the moment when the contact separates, as well as the compression depth of the first terminal 1 and the second terminal 20 into the base 3 so that the load W becomes constant. Therefore, it becomes necessary to open the gateff&j.

The device that adjusts this is the first termidil press-fitting part (
(Fig. 3) and the second terminal press-fit part (Fig. 4).

In FIG. 3, reference numeral 12 is a pulse motor, which lowers a pusher (pressing tool) 13 via a feed screw 13.

A weight lever 15 is swingably attached to the racket 16 via a fulcrum 17, and applies a load to the armature 4 by its own weight. Way I Lever 1
The tip of the armature 4 contacts the protrusion 11'' and applies a load equal to the instantaneous load (denoted as Wb) when the contact 5.6 is opened.
is giving to

Reference numeral 18 is a non-contact type gear/knob dimension measuring device that measures the gap dimension G with respect to the weight lever 15. This monument! By measuring the Yasobu dimension G, the five dimensions under the load wb are indirectly measured. The following measurements of dimensions refer to such measurements.

At the first terminal press-fitting part, adjusting press-fitting is performed by the method described in the next section so that the five dimensions under the wb load are constant.

In the press-fitting part of the second terminal 2 (FIG. 4), a pulse motor 19 moves the pusher 22 up and down via the feed screw 20 and the insulating collar 21. 23 is a weight lever, and the bracket 2 is positioned relative to the base 3.
4 via a fulcrum 25. The tip of the weight lever 23 comes into contact with the protrusion 11'' and applies a constant force wb (determined by the mass of the weight).

A contact pin 26 is attached to the bracket throat 24 via an insulator 27, and contacts the first terminal l with a weak force.

Next, the operation of the device will be described. Figure 5 shows the operation of the first terminal press-fit section (Figure 3).

In this case, (1) the position P1 where the button shear 14 of the first terminal 1 hits, and the gap between the projection 11 and the gluing method;
and (2) Button shear 14 due to deformation during press-fitting.
difference between the amount of descent and the amount of displacement of the protrusion 11), and (3
) The amount of springback of the first terminal terminal after the button 14 is released is detected and adjusted even though it is a clear 'A' product. This adjustment press-fit will be explained in detail below.

(1st press-fitting stem SI),) With the first terminal I shallowly press-fitted into the base 3 using the pusher 14 (NeT Pa)l, measure the 5 dimensions from the gap dimension G as described above, Further press fitting (Pb) is performed taking into account the difference to the target value (b), the amount of springback, and the deformation of the material. After this press-fitting, the 50th dimension is measured again in the same manner.

At this time, the ratio between the press-fitting and sending-out displacement MX of the bushing 14 and the displacement b o of the protrusion 11 due to the displacement MX is calculated by a microcomputer (not shown) and stored. Incidentally, the displacement amount X of the pusher 4 during press-fitting and sending out can be determined from the number of revolutions of the pulse motor 12.

(Second press-fitting step 5P2) Next, as shown in FIG. 5(b), return the bushing 14 until it is separated from the first terminal I, and after it is separated, the protrusion 11 is Next, calculate the return ms due to the spring bank of The return amount s1 is estimated in consideration of the return ls, and the bushing I4 is lowered as shown in FIG. 5(C), and the first terminal 1 is press-fitted (Pc).

After that, when the shisosha 14 is returned and separated from the ff1l terminal 1, the Sl springback returns and the b2τJ method of the protrusion 11 to which the load consisting of wb is applied is the target b-tJ.
Consistent with law [b).

Next, regarding the operation of the 2nd terminal 2 press-fit part (Fig. 4),
(In Figure ff14, when the feed screw 20 is rotated by the ζ pulse motor 19 and the zep sociator 22 is lowered and moved forward, the second terminal 2 is press-fitted and the gap between the movable contact 5 and the fixed contact 6 is closed. The contact 5.6 becomes smaller and the contact 5.6 closes.The moment the contact 5.6 closes can be detected by electrical continuity between the busher 22 and the contact pin 2G.

From this state, the second terminal 2 is further press-fitted by an appropriate amount of spring back.

Next, when the pusher 22 is returned, the pusher 22 is released from the second terminal 2, and the weight lever 23 to which the load wb was applied is removed from the protrusion 11, the state shown in Fig. 1 is reached, and the required contact pressure is 5 dimensions are obtained.

According to the above method, compared to assembling a relay using the conventional method, the variation range of the load applied to the protrusion due to the plunge at the moment of opening the contact is halved, and the variation range of the b1 method in Figure 1 is reduced to 10 minutes compared to the conventional method. I was able to make it number 1.

Therefore, the variation in stroke a is also small. Furthermore, the adjustment time that used to take 30 seconds by hand can now be done in less than 3 seconds.

Note that the present invention can also be applied to assembling microswitches, limit switches, magnetic switches, etc. that have electrical contacts.

Although the non-contact gap size measuring device 18 was mentioned in the description of the embodiment, it is possible to use a commercially available device, for example, a device made by a U.S. manufacturer that uses eddy current loss for detection. (To RAM 8N 5CIENC
ES C0RIIOR8 TOIN) H model, K
D-2310-IU can be used - 4 times.

Further, for the suffling back of the 162 terminal 2, after the movable contact 5 and the fixed contact 6 are brought into electrical contact, an additional tJ is added by appropriately anticipating (taking into account) the amount of spring bank. For the second terminal, even if the first method varies slightly, it has little effect on relay performance.

As described above, in the method of the present invention, the protrusion (1) of the armadure (4) having spring characteristics that holds the movable contact
While applying a constant pressure (wb) to 1), the ff! 1 terminal (1) is driven into the base (3) in several steps without considering the spring bank and deformation, and the position of the protrusion (work 1) relative to the base (3) is adjusted to a predetermined value after springback. After the process, a second terminal (2) that holds a fixed contact in a direction approaching the armadure (4) with the constant pressure (wb) still applied is inserted into the base (3), and the fixed contact Since there is a process of stopping the driving after the terminal and the movable contact are electrically connected, the driving of the first terminal is done in several stages, and the next driving height is determined by considering the previous springback. Therefore, the position of the first terminal with respect to the base is determined at noon (1 noon).

Furthermore, since the first terminal is driven in while applying a constant pressure to the armature, the position of the first terminal relative to the base can be made accurate while contact pressure is being applied.

For example, without applying constant pressure to the armature,
Even if the position of the terminal is determined, the position of the first terminal with respect to the base may be misaligned in the completed state where contact pressure is applied.

Furthermore, since the positioning of the second terminal is performed based on the accurately positioned first terminal using electrical continuity, the assembly adjustment can be completed easily and quickly. be.

[BRIEF DESCRIPTION OF THE DRAWINGS] Fig. 1 shows a diagram of a relay assembled by an embodiment of the method of the present invention in an ON state (Fig.
FF state schematic diagram, Fig. 3 shows the first terminal driving state of the relay. 4 schematic soil diagram Fig. 4 shows the relay second terminal tJ stuck state, Fig. 1 schematic diagram, Fig. 5 FIG. 3 is a schematic explanatory diagram illustrating the notes above for each input step. 4... Armature, 11... Protrusion, 1... First
Terminal, 3...base, 2...second terminal. Representative Patent Attorney Takashi Okabe

Claims (1)

[Claims] A first contact having a movable contact (5) and a fixed contact (6), respectively.
Base terminal (1) and second terminal (2) (
3), while applying a constant pressure (wb) to the protrusion (11) of the armature (4) having spring characteristics that holds the movable contact, the first Terminal (1
) to the base (3) while considering springback and deformation.
) in several steps to bring the position of the protrusion (11) relative to the base (3) to a predetermined value after the spring bank, and then the armadure (4) with the constant pressure (wb) still applied. A contact member automatic having the step of driving a second terminal (2) that holds the fixed contact in a direction approaching the base (3) and stopping the driving after the fixed contact and the movable contact are electrically connected. Assembly is an adjustment method.