JP2001256930A - Method of manufacturing tubular bulb - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method of manufacturing a tubular bulb, allowing the manufacture of a lead wire with less deformation and reducing the mounting malfunction of a stem. SOLUTION: The method of manufacturing the tubular bulb comprises a stem mounting process of transferring a preset-shape lead wire 8, to which plural types of wire materials 8a, 8b, 8c are welded in the longitudinal direction, to a tubular bulb stem 7. A continuous wire 11 consisting of the plural lead wires 8 continuously welded in the longitudinal direction is cut right before transfer to the tubular bulb stem 7 to form the lead wire 8.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a bulb such as a light bulb, a fluorescent lamp, and a cathode ray tube.

[0002]

2. Description of the Related Art Generally, as shown in FIG. 6, a method of manufacturing a tube uses a lead wire 1 having a predetermined shape in which three types of wires 1a, 1b, and 1c are welded in a longitudinal direction. A storage step of storing a plurality of lead wires 1 in a cylindrical storage box 2, and moving the lead wires 1 to a predetermined position by swinging the bottomed cylindrical storage box 2 about a fulcrum 2a by a driving unit; After
A step of grasping and extracting one lead wire 1 from the plurality of lead wires 1 stored in the storage box 2 by the chuck 3, and a cylindrical guide 40 for removing the extracted lead wire 1
And the lead wire 1 is dropped by its own weight, transferred to the tube stem 4, and a stem mounting step of sealing the tube stem 4 and the lead wire 1 is provided.

[0003]

However, in such a method for manufacturing a tube, when the lead wire 1 is manually refilled into the storage box 2 in the storage step, it is easy to remove one lead wire thereafter. For this reason, each lead wire 1 is held down by hand so that the height position of each lead wire 1 from the bottom surface of the storage box 2 is constant. However, since the lead wire 1 is thin, the lead wire 1 may be bent. As a result, in the pulling process, one lead wire 1 cannot be pulled out from the plurality of lead wires 1 by the chuck 3, or even if the bent lead wire 1 can be pulled out, the cylindrical guide 40 cannot be pulled out. Even if the lead wire 1 that is caught or bent in the middle of the process can be transferred to the stem 4 for the bulb, a product defect such as the lead 1 being sealed in a bent state on the stem 4 for the bulb. (Hereinafter referred to as "stem mount failure").

[0004] The present invention has been made to solve such a problem, and a lead wire with less deformation can be manufactured.
Another object of the present invention is to provide a method for manufacturing a tube in which stem mounting defects are reduced.

[0005]

SUMMARY OF THE INVENTION A method of manufacturing a tube according to the present invention is directed to a tube having a stem mounting step of transferring a lead wire of a predetermined shape in which at least two kinds of wires are welded in a longitudinal direction to a tube stem. In the method of manufacturing a sphere, a continuous wire in which a plurality of the lead wires are continuously welded in the longitudinal direction,
The lead wire is cut just before being transferred to the tube stem.

According to this method, a lead wire with little deformation can be manufactured because there is no storing step of the prior art.

The lead wire is transferred to the tube stem by the lead wire holding means.

According to this method, it is possible to reliably transfer the lead wire with little deformation to the tube stem.

Further, the continuous line is corrected to be substantially straight by the continuous line correcting means.

According to this method, the deformation of the lead wire can be further reduced.

[0011]

Embodiments of the present invention will be described below with reference to the drawings.

A fluorescent lamp manufactured by the method for manufacturing a tube according to the embodiment of the present invention has a structure as shown in FIG.
A glass cylindrical bulb 6 having a phosphor 5 on an inner peripheral surface;
A bulb stem 7 having a flare portion 7a heat-fused to the end of the bulb 6, two lead wires 8 sealed to the bulb stem 7 and projecting to the inside and outside; And a filament 9 connected to each end of a lead wire 8 projecting to the side.

The lead wire 8 is formed of three portions having different diameters and materials, and the thickest portion is the inner wire 8a and the thinnest portion is the central wire 8b sealed in the stem 7. The second thickness diameter portion is the outer side wire 8c
It is. The three types of wire rods 8a, 8b, 8c are made of nickel, nickel, and nickel in consideration of conductivity, adhesion to glass, durability, and the like.
Copper or the like is used.

The stem mounting step of the method for manufacturing a tube according to the embodiment of the present invention will be described with reference to the lead wire supply device shown in FIGS. Further, the method of manufacturing the bulb includes a sealing step and an exhausting step for manufacturing the fluorescent lamp after the stem mounting step described below, and this step is the same as the conventional fluorescent lamp manufacturing method. And the description is omitted.

As shown in FIG. 1, a lead wire supply device according to the present invention includes a continuous wire 11 in which a plurality of lead wires 8 are continuously welded in a longitudinal direction, and a supply reel on which the continuous wire 11 is wound. A straightening means 13 for straightening the continuous line 11; a transfer means 15 for holding the continuous line 11 with the first holding means 14 and transferring the continuous line 11 by a predetermined size; A guide 16 for regulating the position, a cutter 17 for cutting the continuous wire 11 to form the lead wire 8 having a predetermined size and shape, and a second holding means 18 for holding one end of the continuous wire 11 are sequentially provided. They are arranged and arranged.
The second holding means 18 for holding the lead wire 8 cut by the cutter 17 is provided with a pin 18 as shown in FIG.
a about 90 degrees, and the positioning holes 19a
In the Z direction, and insert the lead wire 8 into the positioning holes 19a and 19b on the block 19 via the tube stem 7. The sensor 20 shown in FIG.
And the cutter 17 is operated in the Y direction to form the lead wire 8. The sensor 21 shown in FIG. 2 detects that the lead wire 8 has been inserted to a predetermined depth of the positioning hole 19a.

The continuous wire 11 has three types of wires 8a, 8b,
8c are sequentially welded in the longitudinal direction to produce lead wires 8 of a predetermined shape, and subsequently, a plurality of lead wires 8 are continuously welded in the longitudinal direction. For example, the illustrated continuous line 11 is composed of three types of wires 8a, 8b, 8c, 8a, 8b, 8c, 8
a, 8b, 8c.

The correcting means 13 includes a grooved roller 13a.
Are arranged in a zigzag pattern, and the gap between the opposing rollers 13a is individually adjusted so that the continuous line 11 wound on the supply reel 12 is substantially straightened.

The transfer means 15 comprises a first holding means 14 for holding the continuous wire 11, a belt 15a and a motor 15b for reciprocating the first holding means 14 in the X direction by a predetermined dimension. ing.

In the stem mounting step of the method of manufacturing a tube according to the present invention, first, as an initial state, the tip of the continuous line 11 from the supply reel 12 is inserted into the hole 16a of the guide 16 through the straightening means 13 and the first holding means 14. Insert

At this time, the first holding means 14 is connected to the continuous line 11
And is located on the supply reel 12 side. The cutter 17 and the second holding means 18
It is waiting in an open state so as not to hinder the movement of No. 1. The continuous line 11 that has passed through the straightening means 13 is straightened substantially linearly.

Next, after the continuous line 11 is grasped and held by the first holding means 14, the continuous line 11 is moved in the direction of the tube stem 7 by the transfer means 15, and the diameter of the continuous line 11 is By detecting the step A, the continuous line 11 is moved by a predetermined length.

Next, after holding the leading end of the continuous line 11 by the second holding means 18 and holding it, the cutter 17
Cut 1 At this time, as shown in FIG. 3, what is held by the second holding means 18 is the lead wire 8 formed in a predetermined size and shape.

Next, the lead wire 8 is transferred to the tube stem 7. That is, as shown in FIG. 2, the second holding means 18 holding the lead wire 8 is moved about 90 degrees around the pin 18a.
The lead wire 8 is inserted into the positioning hole 19a on the block 19 via the stem 7 for the tube by rotating the rod 8 degrees and then moving in the Z direction. At this time, the second holding means 18 is stopped at a predetermined position in the Z direction by detecting with the sensor 21. As a result, the lead wire 8 can be arranged at a predetermined position with respect to the tube stem 7.

Next, the first holding means 14, the cutter 17 and the second holding means 18 are returned to the initial state, and the same steps are repeated. Finally, the lead wire 8 is inserted into the positioning hole 19b on the block 19. I do.

Next, the operation and effect of the first embodiment of the present invention will be described.

The method of manufacturing a tube according to the present invention has a problem that the lead wire is bent by cutting the continuous wire 11 immediately before transferring the continuous wire 11 to the tube stem 7 to form the lead wire 8. Since there is no housing step, the lead wire 8 with less deformation can be manufactured.

Further, since the lead wire 8 is supplied to the predetermined position of the tube stem 7 by the second holding means 18, the lead wire 8 with little deformation is surely supplied to the predetermined position of the tube stem 7. And the number of defective stem mounts can be reduced.

Further, since the continuous wire 11 is straightened by the straightening means 13 in a substantially straight line, the deformation of the lead wire 8 can be further reduced, and the defective stem mounting can be further reduced.

In the above embodiment, the welding order of the continuous wire 11 is determined by the order of the wires 8a, 8b, 8c, 8a, 8b, 8c,
8a, 8b, 8c, but not limited to this, the wires 8a, 8b, 8c, 8c, 8b, 8a, 8a,
A continuous line such as 8b and 8c may be used. Further, although the continuous wire 11 is composed of three types of wires, the present invention is not limited thereto, and the continuous wire 11 may be composed of a plurality of types of wires such as two types of wires and four types of wires.

Although the description has been made using the continuous wire 11 wound on the supply reel 12, the present invention is not limited to this, and the continuous wire 11 wound and stored in a storage box may be used.
The supply reel 12, a continuous wire 11 manufactured by directly welding wires 8a, 8b, 8c without using a storage box.
May be used.

The transfer means 15 is composed of a first holding means 14 for holding the continuous line 11, a belt 15a and a motor 15b for reciprocating the first holding means 14 by a predetermined size. However, the present invention is not limited to this. As shown in FIG. 5, rubber rollers 30, 31 having a large frictional resistance sandwiching the continuous line 11, and rotating the rubber roller 30 forward or reverse to move the continuous line 11 by a predetermined dimension. Motor 32 and rubber roller 31 with respect to rubber roller 30
May be used with a spring 33 for pressing against a constant pressure. According to this embodiment, the rubber roller 3
Since the continuous line 11 can be moved by the rotation of 0 and 31, the size of the apparatus can be reduced.

Although the method of directly inserting the lead wires into the positioning holes 19a and 19b has been described with the method of performing the lead wires directly by the second holding means 18, the present invention is not limited to this. The method may be performed indirectly by dropping under its own weight via a conventional cylindrical guide 40 shown in FIG.

For cutting the continuous line 11, the cutter 1
7, the method is described in a mechanical manner. However, the present invention is not limited to this, and a method in which the method is performed thermally using laser light or the like may be used. According to this embodiment, since the continuous wire 11 can be blown off by light heat, the deformation of the lead wire can be reduced and the noise can be reduced.

Further, the above-described manufacturing method has been described for a fluorescent lamp, but the present invention is not limited to this and can be applied to a light bulb and the like.

[0035]

As described above, according to the method of manufacturing a tube of the present invention, a continuous wire in which a plurality of lead wires are continuously welded in a longitudinal direction is cut immediately before being transferred to a tube stem. By forming the lead wire, a lead wire with less deformation can be manufactured.

Further, by transferring the lead wire to the tube stem by the holding means, it is possible to reduce stem mounting defects.

In addition, by correcting the continuous line into a substantially straight line by the correcting means, it is possible to further reduce defective stem mounting.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a lead wire supply device for explaining a supply step of a method of manufacturing a tube according to a first embodiment of the present invention.

FIG. 2 is a diagram showing a supply state of a lead wire to a tube stem in the apparatus.

FIG. 3 is a diagram showing a state in which a continuous wire is cut and formed into a lead wire in the apparatus.

FIG. 4 is a sectional view showing a fluorescent lamp manufactured by the method for manufacturing a tube of the present invention.

FIG. 5 is a perspective view showing another lead wire supply device used in the method for manufacturing a bulb of the present invention.

FIG. 6 is a view for explaining a supply step of a conventional method of manufacturing a bulb.

[Explanation of symbols]

 7 Stem for tube 8 Lead wire 8a, 8b, 8c Wire rod 11 Continuous wire 12 Supply reel

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor, Seimichi Tani, 1-1, Yukicho, Takatsuki-shi, Osaka, Japan Matsushita Electronics Industrial Co., Ltd. (72) Keizo Okasaka 1-1, Yukicho, Takatsuki-shi, Osaka, Matsushita Electronics Industrial Co., Ltd. F-term (reference) 5C012 AA01

Claims (3)

[Claims] 1. A method for manufacturing a tube, comprising a stem mounting step of transferring a lead wire of a predetermined shape in which at least two types of wires are welded in a longitudinal direction to a tube stem.
A method for manufacturing a tube, comprising cutting a continuous wire in which a plurality of the lead wires are continuously welded in a longitudinal direction immediately before transferring the lead wire to the tube stem. 2. The method according to claim 1, wherein the lead wire is transferred to the tube stem by the lead wire holding means. 3. The method according to claim 1, wherein the continuous line is corrected to be substantially linear by the continuous line correcting means.