JPH0116258Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to the improvement of an encapsulation machine that encapsulates and assembles a pair of lead pieces into a glass tube in the production of encapsulated contacts, and particularly for reed switches intended to improve the precision of contact gaps. Regarding the inclusion machine clamper.

FIG. 1 is a diagram showing how a lead piece is attached to an encapsulation machine when a conventional switch is encapsulated, and FIG. 2 is a diagram illustrating the problem.

In FIG. 1, 1 and 2 are both lead pieces, and 3 is a lead material (circular cross section) whose ends 1a and 2 are flattened and molded.The tips 1a and 2a of the lead pieces 1 and 2 are shown at a predetermined length from both the upper and lower directions as shown in the figure. The switch contact portions are formed by slightly overlapping and facing each other while maintaining a predetermined gap 10, and 5 and 9 are the corresponding portions of the lead piece chuck of the encapsulation machine.

A sectional view of the contact portion 3 taken along the line A--A in the figure is shown in 6, and a sectional view of the parts 5 and 9 of the lead piece chuck taken along the line BB in the figure is shown in 7.

In such a conventional lead piece chuck, for example, the part 9 of the lead piece chuck is composed of a V-shaped groove 8 and a corresponding convex part 9a for clamping and fixing the circular cross section of the lead piece 1. Therefore, when the lead piece 1 is accurately fed onto the center line of the groove 8, the holding stability of the lead piece 1 is good.

However, the material feeding position of the lead piece 1 is not in the groove 8.
If there is any deviation from the center line, rotational deviation will occur during chuck, resulting in a change in the gap 10 at the contact portion.

This state will be explained below with reference to FIG.

In the figure, A represents the occurrence of rotational deviation, and B represents the change in contact gap.

In the diagram A showing the part of the cross-sectional view 7 in FIG. In this case, the plate-shaped tip portion 1a of the lead piece 1 shown by the broken line is oriented in the vertical direction in the drawing as the normal direction.

Here, when the lead piece chuck 9 is moved in the direction of arrow P and the lead piece 1 is pushed toward the back of the groove 8, the lead piece 1 is pushed by the convex part 9a and rotates in the direction R shown in the figure. It reaches the position surrounded by the groove walls shown in Figure B and is clamped and fixed, but at this stage the plate-shaped tip 1a of the lead piece 1 shown by the broken line is oriented vertically in the original plane of the paper, which indicates the normal direction. On the other hand, it is rotated by an angle θ in the R direction.

This phenomenon also occurs with respect to the lead piece 2 which is clamped and fixed to the part 5 of the lead piece chuck.
The tip portions 2a of are rotated by an angle θ in the same direction.

In Figure B, which explains the change in gap, A shows the case where the contact part 3 in Figure 1 is normal, and the lead piece 1 is
The gap 10 between and 2 is the predetermined gap dimension g
represents a state in which they are located parallel to each other while maintaining the
(b) Lead pieces 1 and 2 are at an angle θ in the same direction.
It shows the state where it is rotated.

In this case, the normal gap dimension g and the vertical gap dimension between lead pieces 1 and 2 after rotation.
The relationship g′=gcosθ holds between g′.

Therefore, the occurrence of the angle .theta. reduces the normal gap dimension g, which in turn causes deterioration in the characteristics of the reed switch and a decrease in manufacturing yield.

The purpose of the present invention was to solve the above-mentioned problems, and in order to achieve the purpose, the circular cross section of the lead piece held in the correct position and direction by the loader is divided into two flat surfaces. The clamping structure makes it easy to ensure highly accurate contact gap dimensions.

An embodiment of the present invention will be described below with reference to FIG. 3, which is a perspective view showing an example of the main part of the clamper of an encapsulating machine, and FIG. 4, which is a plan view of the chuck section viewed from the vertical direction.

In this figure, the part related to the lead piece 1 is described for ease of understanding, but the lead piece chuck corresponding to the lead piece chuck corresponding to the corresponding part 9 in FIG. As shown in section 5, although the directions are reversed in the vertical direction, the corresponding positional relationship is maintained and they are arranged in exactly the same configuration.

The conventional V-shaped chuck configuration has been changed to include lead piece 1.
As shown in FIGS. 3 and 4, in this application, one side is a flat receiving surface 11a of the desk 11, and the other side is a flat holding surface 12a,
3a, for example, two upper and lower clamp pieces 12,
It consists of 13 parts.

In other words, the numeral 14 shown in FIG. 3 is a loader that feeds the lead piece 1 to the lead piece chuck portion, and the end face of the loader 14 on the receiving surface 11a side of the chuck stand 11 is provided with, for example, a lead piece. A recess 14a having a size that allows accurate positioning of the plate-shaped tip 1a of No. 1 in the vertical (up and down in the paper) direction, and the recess 14
A plurality of through holes (not shown) are provided that penetrate the inside of the loader 14 from a, and the other ends of the through holes are connected to a vacuum pump (not shown).

The lead piece 1' supplied here is transferred to the loader 14.
In this state, the lead piece 1' is moved in the direction of the desk 11 located in front along the dashed line 15 until the circular cross section portion of the lead piece 1' comes into contact with the flat receiving surface 11a of the desk 11. .
The lead piece 1' at this point is shown as lead piece 1 in FIG.

Next, two clamp pieces 12 having holding surfaces 12a and 13a parallel to the receiving surface 11a,
13 in the direction of the desk 11 at the same time, the circular cross section of the reed piece 1 is placed on the receiving surface 11.
The structure is such that it is clamped and fixed between a and a.

In this case, since the receiving surface 11a that clamps the circular cross-sectional portion of the lead piece 1 and the holding surfaces 12a and 13a parallel to the receiving surface 11a are both flat surfaces,
There is no occurrence of rotational deviation θ at the time of chuck due to deviation in the material supply position as explained in FIG. On the other hand, the same applies to the lead piece 2 that is paired with the lead piece 1.

This means that the plate-shaped tip 1 of each lead piece 1, 2
This means that the lead pieces 1 and 2 are transferred from the loader to the chuck part while the parts a and 2a are held in the direction that ensures the normal contact gap dimension g.

Furthermore, since the chuck structure has a simpler shape consisting of a flat receiving surface and a holding surface compared to the conventional complicated shape consisting of a V-shaped groove and a convex portion, the heat applied to the chuck portion during sealing is reduced. Dissipation is greater than in the past, and distortion caused by heat in the chuck portion can be reduced.

Therefore, in the past, the chuck part was repaired or replaced after a certain period of work, but since the chuck part is less deformed and clamping accuracy can be maintained over a long period of time, it is possible to maintain clamping accuracy over a long period of time. The machine can save time and effort in maintenance management.

From this point of view, the present invention has great practicality.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing how a lead piece is attached to an encapsulation machine when enclosing a conventional switch, Fig. 2 is a diagram illustrating a problem, Fig. 3 is a perspective view showing an example of the main part of the clamper of an encapsulation machine, and Fig. 4 The figure is a plan view of the chuck section viewed from the vertical direction. In the figure, 1, 1', 2 are lead pieces, 1a, 2a are plate-shaped tips, 3 is a switch contact part, 5, 9 are the relevant parts of the lead piece chuck, 6 is a cross-sectional view of the switch contact part, 7 is a lead A sectional view of the parts 5 and 9 of one chuck, 8 is a concave groove, 9a is a convex part, 10 is a contact gap, 11 is a chuck base, 11a is a receiving surface, 12,
13 is a clamp piece, 12a, 13a are holding surfaces, 1
Reference numeral 4 indicates a loader, 14a indicates a recess, and 15 indicates a chain line.

Claims (1)

[Claims for Utility Model Registration] A pair of lead pieces made by crushing and molding one end of a lead material with a circular cross section are each chucked by a clamper, and the clamper is moved in a predetermined direction to be inserted into an enclosure tube. In the reed switch encapsulation machine, the pair of lead pieces have flattened portions facing each other in parallel to form a switch contact portion having a predetermined gap and overlap, wherein the clamper is configured to at least touch the flattened portions of the lead pieces. a movable loader that holds the lead piece; a chuck stand having a flat receiving surface on which the circular cross-section portion of the lead piece comes into contact; a clamp piece having a holding surface, the loader moves while holding the flattened portion of the lead piece to bring the circular cross-sectional portion into contact with the receiving surface of the chuck stand; A reed switch encapsulant clamper, characterized in that the reed piece is held so as to form a switch contact portion by moving the clamp piece and pressing and chucking the circular cross-sectional portion against the receiving surface.