JPS622449A - Manufacture of bulb stem - 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 [Technical Field of the Invention] The present invention relates to an improvement in a method for removing unnecessary portions of acta lead planted on a button stem.

[Technical background of the invention and its problems]

For example, in order to increase the light emitting area of a tube such as a fluorescent lamp, attempts have been made to use a button stem instead of the conventional flare stem.

Generally, button stems are manufactured by melting short glass tubes with a burner and molding them into circular glass plates, but the reeds planted on the button stems are placed at equal intervals along the circumference of the glass disk. If the number is small, it is difficult to form a button stem into a circular shape, making it difficult to seal the button stem with a glass bulb in the subsequent process. However, in many cases, such as fluorescent lamps, only two lead wires are required for functionality, so lead wires other than the two necessary lead wires are only needed on the button stem molding, and are used in the lamp exhaust process and at the base. The outer leads of the lead wires were cut off after molding because they would get in the way during the attaching process. The outer lead can be cut by mechanically cutting the outer lead exposed from the button stem using nippers or cutters, or by exposing the welding point between the Dumet wire and the outer lead on the acter lead side of the button stem, and then swinging the acter lead. A method has been used in which the outer lead is broken at the welding point. In the former case, when the outer lead is mechanically cut with nippers or cutters, the impact tends to cause minute cracks on the button stem at the base of the outer lead. This method has drawbacks such as causing problems such as this and requiring time and effort to maintain the cutting blade. In addition, in the latter case, a lead wire must be specially manufactured that has a mechanically weak connection at the welding point between the Dumet wire and the outer lead, and it takes time and effort to break the outer lead. If the connection at the welding point is not mechanically weak, cracks will occur in the button stem when the outer lead is broken, and the same problem as described above will likely occur.

[Purpose of the invention]

The present invention has been made to address the above-mentioned problems in the prior art, and an object of the present invention is to provide a method for manufacturing a tube stem, which allows easy removal of unnecessary outer leads planted on a button stem with a small number of man-hours. shall be.

[Summary of the invention]

The present invention is a method for manufacturing a tube stem, characterized in that unnecessary outer leads of a button stem are removed by cutting.

[Embodiments of the invention]

The details of the present invention will be explained with reference to examples.

The button stem 0 used in a tube, such as a fluorescent lamp, has a plurality of leads, for example four, on a glass disc (1), as shown in the plan view seen from the inner lead side in Figure 3. Line (2), (21, (3), (3
i are evenly arranged and planted with respect to the center of the disk (1). The above lead wires (2), (21, (3)
, (3F disk) On the inner lead side of 1) there is a raised glass boss (6) for the purpose of reliably pressurizing the lead wire for melting and fixing. α is the exhaust hole.The lead wires that connect the tungsten filament and support the electrode are (2) and (2), and (3) and (a'> are the lead wires that do not support the electrode. It is configured as follows.

Therefore, at least the outer leads of leads #(3) and (3) are unnecessary and are preferably removed. As described above, a short glass tube is placed on the lower mold α1 shown in FIG. 1 placed on the bed of the button stem machine, and the lead wires (21, (25, (3), Hole of lower mold αυ (Q3 in Fig. 1, (1
3) shows a part of it. ) and rotates in the direction of the arrow in Fig. 1, the glass tube is heated and melted by a burner (not shown), and then pressed from above to below by an upper mold (not shown) to form a button stem (141). 26) is the exhaust pipe.Next, the hole in the lower mold (11) of the button stem machine, for example αa,
(The push-up bins ae and αD attached to the push-up member (Is) are pushed upward from the bottom of 13, and the button stem I in Figure 1 is pushed up from the push-up bin (le,
(I7) shows the state of being lifted in the direction of arrow (Bl, (B1). During this time, the lower mold α
υ and the button stem I are rotating in the direction of the arrow (A1). The narrow line part is exposed. In this state, aim the burner (21) at the outer lead α seconds and α yu from the gap between the disc (1) of the button stem α4) and the lower mold αυ. Figure 2 shows This is a plan view of the button stem I viewed from the outer lead side.The burner (21
) shows the state in which the incident light (22) is shining on it. When the incident light (22) of the burner (21) hits the thin wire portions (2), -, the thin wire is easily fused and cut because it is, for example, Dumet, which is an iron-nickel alloy wire coated with copper and has a diameter of about 0.4U.

Since the button stem I is rotating in the direction of the arrow (Q) in Fig. 2, the incident light (22) of the burner (21) is at the outer lead portion α.
Ne4s1. ■, - are uniformly hit, but it is an outer lead decoy.

([j is the material, for example, nickel, and the diameter, for example.
Since the wire is about 0.75 m or 1 fi or more, it will not be fused by the above heating. Therefore, only the outer leads I side i side of the desired lead wires (3) and (3) can be removed. Note that the button stem αω is immediately after being burned by the burner (21) K to melt the glass and form the glass disc (1) as described above.
The button stem (14) itself is hot.

There is no possibility that undesired strain stress will be generated on the button stem side due to lead wire heating by the burner (21), and cracks will not occur in the glass. Note that the outer lead (11, ad) inside the lower mold that has been fused can be easily removed mechanically. Figure 4 shows an example of a lead wire that is fused on the actor lead side.
The thin wire (24) such as Dumet connected to (23) is (
It can be two parts as shown in figure A1, or it can be three parts with the outer lead (25) connected to the end of the thin wire (24) as shown in figure B1, and the length of the thin wire part is approximately the same as the lead wire on the side that is not fused. If it is twice as large, for example about 6n or more, it is sufficient to achieve the object of the present invention.

Note that the present invention is not limited to the case where two outer lead side lead wires are fused with four lead wires as in the embodiment, but can be applied to any button stem with a plurality of lead wires and the number of leads required to be fused. is possible.

In addition, in the above embodiment, the stem in the button stem machine is raised by pushing up the lead wire, but this is not limited to this; it is also possible to push up the exhaust pipe section or the lower mold side that holds the glass disc and constitutes the stem head. It may also be made to descend. In addition, the outer lead that is cut at 0 m is not made with a small diameter,
The outer lead on the side to be fused and cut may be made of a metal with a lower melting point than that on the side to remain (so that it can be blown out in a shorter time).

Further, while rotating the button stem, the burner may be used to fuse only the do, and in this case, it is applicable when the same lead wire as the one to be left is used.

Further, the outer lead is not limited to being cut by gas burner &C, but may be cut by laser, arc discharge, etc. By these means, the outer lead protruding from the glass disk can be made extremely short.

Furthermore, fusing is not limited to cutting on a stem machine.
For example, after the stem is completed, the work may be carried out with the glass disk portion heat-shielded.

〔Effect of the invention〕

The present invention is a method for manufacturing a tube stem, which is characterized by cutting off and removing unnecessary outer leads of a button stem, and since the outer leads are not cut with nippers or cutters, the attachment of the outer leads is done at the roots. There is no cracking on the button stem, and the method of weakening the welding point of the acta lead and breaking the outer lead eliminates the need to specially manufacture the lead wire with the weak welding point.1
The outer lead can be easily removed by fusing and removed, reducing the number of man-hours, reducing the number of defects, and improving the quality of the stem, which has a special effect.

[Brief explanation of drawings]

Figure 1 is a sectional view (line 1-1 in Figure 2) showing the button stem of a button stem machine used in an example of the manufacturing method of the present invention in a raised state; FIG. 3 is a plan view of the state in which the thin wire portion is fused and cut, as seen from the outer lead side of the button stem. Fig. 3 is a chigaki diagram of the button stem viewed from the inner lead side, and Fig. 4 is a front view of an example of the lead wire used at the point where the lead wire on the outer lead side applied to the present invention is fused. . 1...Glass disk, 2,3...
Lead. 14...Button stem, 16,17...
...Keihin thrusting up. 18, 19...Outer lead.

Claims (1)

[Claims] A method for manufacturing a tube stem, characterized in that unnecessary outer leads of a button stem having a plurality of lead wires planted on a glass disc are removed by fusing.