JPS60140627A - Manufacture of circular fluorescent lamp - Google Patents

Abstract

PURPOSE:To decrease the generation of molding failure in a circular fluorescent lamp, by providing an adjusting process for the change of mutual distance between the lower ends of glass bulbs on the basis of the position where the lower end of one of glass bulbs is located. CONSTITUTION:Straight glass pipe bulbs 1, 2 are simulteneously heated and softened. At the lower ends 7, 8 of the glass bulbs 1, 2, semi-fixed holders 9, 10 are provided, and when a manufacturing machine is driven, said bulbs are shaken and the distance (b) between the lower ends 7, 8 grows larger than the distance (a) between the upper ends 3, 4. In the next process, the holders 9, 10 are dismounted and other holders (A), (B) are forced to support the lower ends 7, 8. In this case, on the basis of a holder (A) which supports the position corresponding to the lower end 8 of the glass bulb, a holder (B) which supports the position corresponding to the other lower part 7 is forced to approach the holder (A) side and the distance between the lower ends is mechanically adjusted to grow into approximately the same distance as the distance between the upper ends 3, 4. Next, the lower ends 7, 8 are grisped by the chuck of a circular molding drum, and the glass bulbs are wound around the molding drum and then molded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an improvement in a method for manufacturing annular fluorescent lamps in which two or more straight glass pulp tubes are heated and softened and wound around a ring-forming drum to form a ring.

[Technical background of the invention and its problems]

When manufacturing annular fluorescent lamps, the phosphor coating on the inner surface may be damaged by cash on delivery.
- After sealing the installed stem, the straight glass pulp is heated and softened and wound around a ring-forming drum to form it into a ring shape, and then the exhaust, electrode activation.

It is completed after going through processes such as enclosing mercury and an easily dischargeable electrical element.

Recently, the above-mentioned annular fluorescent lamp manufacturing equipment has been improved in the direction of automatic, high-speed mass production, and two parts are loaded onto the manufacturing machine.
Methods in which two or more lamps are transported and processed at the same time (such as the double boat method) have come into use. This method can manufacture a large number of lamps in a short period of time, but in the manufacturing equipment that heats and softens the straight glass pulp and wraps it around a ring-forming drum to form a ring, it is not possible to produce a large number of lamps in a short period of time. The upper end C3L (4) of the straight glass pulp (11, (2) is supported by a holder f51. (61) integrally fixed to a head (not shown), and when softened by heating, the straight glass pulp (11 , (Although the lower ends (71, (81) of 21 are supported by the supports (91, (10),
The supports (91, (10) are semi-fixed so as not to resist the elongation of the glass bulbs (11, (21) due to heating), so the machine is driven and the straight glass bulbs (1
), (2) are transported to the next process in the direction of the middle mark (71, (81) tend to shake and bend slightly backwards, for example, as shown in the figure, two glass bulbs In the case of , the distance between the upper end (31, f41 (al) and the lower end (
71, (When comparing the spacing (8+) with bl, there was a tendency for (b) to be larger than (al).If the spacing between the two glass bulbs differs between the upper and lower ends in this way, heating The glass bulb (
When the lower end (71, T8) of (21) is gripped by the chuck of the ring-shaped drum, the chuck and the lower end (71, T8)
, (81 was misaligned and gripping was not performed completely, resulting in a problem that manufacturing defects and molding defects frequently occurred during ring forming.

The deviation in the distance between the upper and lower ends of the glass bulb is not necessarily constant depending on the glass bulb's wall thickness, elongation due to heating, or the glass bulb, so the above deviation is also not constant, which is a major problem in ring forming processing using high-speed machines. Met.

[Purpose of the invention]

The present invention was made in view of the above-mentioned problems, and it is possible to accurately grasp the lower end of the glass bulb with the chuck of the annular drum regardless of the wall thickness or elongation of the straight glass bulb, resulting in manufacturing defects. It is an object of the present invention to provide an improved method for manufacturing an annular fluorescent lamp that is less likely to cause molding defects.

[Summary of the invention]

4. The present invention is fixed at the upper end and supported vertically.4. The above-mentioned glass produced in the step of simultaneously heating and softening the bulbs on two or more straight glass bulbs, and the step of transferring the two or more heated and softened straight glass bulbs to a position where they are wrapped around a ring-forming drum. This method of manufacturing an annular fluorescent lamp includes the step of adjusting the mutual distance between the lower ends of the bulbs with reference to the position of the lower end of one of the glass bulbs.

[Embodiments of the invention]

The details of the present invention will be explained.

At least two straight glass bulbs (11, f21) having phosphor coatings on their inner surfaces are vertically supported at the upper ends of the glass bulbs (31, (41) by a holder integrally fixed to the head as shown in the attached diagram above. is maintained.

In this state, the straight glass pulps m and (2' are simultaneously heated and softened. The lower ends of the glass bulbs (71 and (8'l)
are provided with semi-fixed supports (91, (10)), which are swung when the manufacturing machine is driven, and the lower ends (7),
(81 interval (bl is the upper end (31, (4) interval (al
Become bigger.

In the next step, the supports (91, (10) are removed and the supports (9) are removed.

(10) was supporting the lower end of the glass bulb (71, (
8) is supported by another support (Al, (B). At that time, with reference to the support (3) that supports the position corresponding to the lower end (8) of the glass bulb, the other lower end ( A support (Bl) that supports the position corresponding to 7)
the upper end (3) of the glass bulb close to the support (8) side.
1. Mechanically adjust the spacing to be approximately equal to the spacing of (41).Since the glass bulbs (1) and (21) are heated and softened, no resistance will occur during the above adjustment.Continuing,
Glass bulb fl), (The lower end (71, f81 of 21 is grasped with the chuck of the ring forming drum and the glass bulb is wrapped around the above forming drum nine times to form it. The lower end (7) of the glass bulb is the other lower end IQ+6) l--M3 pigeon 44 straight I 11 I J, 1 door T prostitute t71 or old coins can be easily done,
Next, the support (Bl) is brought close to the support (5) as a reference and stopped at a predetermined position, which can be easily done by setting a stopper.

By providing ring-forming drums at predetermined intervals with respect to the position of the support (At), the chuck of the drum can very reliably grip the lower end of the glass bulb and perform ring-forming.

In addition to the above, it is also possible to move the support tool (Bl) to a predetermined position by separating the support tool (Bl) from the support tool fAl based on the support cause.

〔Effect of the invention〕

The present invention provides at least two vertically supported
The mutual spacing between the lower ends of the glass bulbs that occurs during the step of simultaneously heating and softening two or more straight glass pulps and the step of transferring the two or more heat-softened straight glass pulps to a position where they are wound around a ring-forming drum. This method of manufacturing an annular fluorescent lamp is characterized by the step of adjusting the change in the position of the lower end of one glass bulb with reference to the position of the lower end of one of the glass bulbs. The occurrence of the drum chuck being misaligned with the lower end of the glass bulb and the chuck not being able to grip the lower end of the glass pulp has been completely eliminated, and therefore manufacturing defects and molding defects during ring forming have been completely eliminated. (It has become possible to mold annular fluorescent lamps using high-speed machines with extremely high yields.)

[Brief explanation of the drawing]

The figure shows the positional deviation of the lower end of the glass bulb during the heating softening process of the straight tube lath bulb. 1.2...Straight glass pulp 3.4...Top end of glass bulb 7.8...
... Lower end of glass bulb 5.6 ... Holder 9.10 ... Support agent Patent attorney Noriyuki Chika (and one other person) Procedural amendment (method) % formula % 1 , Indication of the case Japanese Patent Application No. 1982-245172 2 Name of the invention Method for manufacturing annular fluorescent lamp 3 Person making the amendment Relationship to the case Patent applicant (307) Toshiba Corporation 4, Agent Address: 105 Tokyo No. 1-1, Shibaura-chome, Minato-ku, March 27, 1982 (Shipping date) 7. Contents of amendment (1) "Diagram" on page 7, line 10 of the specification is corrected to "Figure 1." (2) Correct the drawing as shown in the attached sheet. that's all

Claims (1)

[Claims] The process of simultaneously heating and softening at least two or more straight glass pulps whose upper ends are fixed and supported vertically, and the process of transferring the heated and softened straight glass pulps to a position where they are wound around a ring-forming drum. 1. A method for manufacturing an annular fluorescent lamp, comprising the step of adjusting a change in the mutual spacing between the lower ends of the glass bulbs with reference to the position of the lower end of one of the glass bulbs.