JPS60140629A - Manufacture of circular fluorescent lamp - Google Patents

Abstract

PURPOSE:To enable the speed of forming a holding concave part to be increased by horizontally holding a straight tublar bulb while rotating it and gradually pressing a formation jig from one direction to a periphery of the end part for forming the concave part by turns down to the prescribed depth. CONSTITUTION:When a straight tublar bulb 1 immediately after stem sealing process is carried to its home position while rorating by a carrier body 8 a roller 9 standing by under said position rises to hit the periphery of an end part, in softened state, of the bulb 1, while the roller 9 starts the driven rotation according to the self rotation force of the bulb 1. Then the roller 9 moves a little in the carrier direction of the bulb 1 while slowly rising and meanwhile the roller 9 gradually presses the periphery of the end part of the bulb 1 for giving a concavity and when the roller 9 rises up to the prescribed height, the concave part 2 is formed on the periphery of the bulb end part. Next, the roller 9 descends to get to its home position while waiting for the bulb 1 coming subsequently being forwarded continuously.

Description

DETAILED DESCRIPTION OF THE INVENTION A. Field of Industrial Application This invention is used for manufacturing annular fluorescent lamps, and is particularly applicable to gripping the end of a straight tube bulb when bending the straight tube bulb into an annular shape. The present invention relates to a method of forming a recess used for

Conventional technology The manufacturing of annular fluorescent lamps generally involves a process of applying a fluorescent film to the inner circumferential surface of a straight tube bulb and firing it, a step of sealing a stem having electrodes at both openings of the straight tube bulb, and a step of sealing a stem having electrodes at both openings of the straight tube bulb. The process of heating and softening the tubular valve and bending it into an annular shape using a two-part bending drum, exhausting the impurity gas inside the bent annular valve and activating the electrode, followed by the necessary inertization process. The exhaust process involves filling with gas, etc., and the finishing process involves attaching a cap to the annular valve. The above bending process is carried out by gripping one end of the straight valve with a chuck, gripping the other end with the gripping claw of the bending drum, and rotating and lifting the bending drum along the straight valve. It will be done. Immediately after the stem sealing process is completed, recesses (2) (2) are formed on the outer periphery of both ends of the straight pipe valve, as shown in Figure 1, so that the chuck and curved drum can be gripped well. There is. In addition, (3
) (3) is a stem sealed at both ends of the straight pipe valve (1), (4) (4) is an electrode connected to the tip of the strut wire extended by the stem (3) (3), ( 5) is an exhaust pipe extending from one stem (3).

The above-mentioned sealing of the stem and formation of the recess are performed in an integrated manufacturing line as shown in FIGS. 2 to 4. First, as shown in Figure 2, hold the straight pipe valve (1) vertically, insert the stem (3) into its lower end, and apply the burner flame (
6) to weld the tip of the flared part (3") of the stem (3) to the straight valve (1). Then, the end is sufficiently heated to melt the outer periphery of the softened lower end of the valve. 3rd to
As shown in the figure and FIG. 4, the desired recess (2) is formed at once by pressing the recess forming molds (7) (7) which are divided into two in the axial direction. Similarly, the stem (2) is sealed at the other end of the straight pipe valve (1) to form a recess (2).

Problems to be Solved by the Invention The above-mentioned conventional recess forming method is difficult to implement if the valve feed is continuous, so the valve feed is performed intermittently. Therefore, it is difficult to speed up the formation of four parts,
This was one of the factors that made it difficult to mass-produce the entire annular fluorescent lamp. Further, it is necessary to prepare the recess forming molds (7) (7) according to the valve size, making management of changes in valve size complicated.

20.Means for Solving the Problems The present invention, as a means for solving the above-mentioned problems, provides a system in which the straight pipe valve after stem sealing is held approximately horizontally and rotated, while the end of the straight pipe valve is rotated. To provide a method of gradually pressing a shaping jig against an outer periphery from one direction to sequentially form recesses to a predetermined depth. By using the rotation of a straight pipe valve to form a recess in this way, it is possible to continuously feed the straight pipe valve, and it is also possible to change the valve size with a single shaping jig.
The above problems are solved.

E. Example Fig. 5 and Fig. 6 show a specific example of an apparatus for carrying out the method of the present invention. A conveying body such as a roller conveyor that continuously feeds in the orthogonal direction, and (9) a shaping jig made of a material that does not damage the glass surface of the bulb (1), such as graphite paper, placed below the conveying body (8). For example, it is a circular shaping roller. The shaping roller (9) has its central axis (10
) is rotatably pivoted and held on a bearing stand (11) to perform the following movements. The shape of the outer circumferential cross-section of the shaping roller (9) corresponds to the desired recess (2) formed at the end of the straight pipe valve (1).
) according to the outer circumferential cross-sectional shape.

Straight pipe valve (1) immediately after stem sealing in carrier (8)
When the valve (1) is rotated and conveyed to a fixed position, the roller (9) waiting under the positionalon rises and removes the softened end of the valve (1) as shown in Fig. 7 (A). Upon reaching the outer periphery, the roller (9) begins to rotate due to the rotational force of the valve (1). Then, the roller (9) gradually rises and moves a little in the conveying direction of the valve (1), and during this time, the roller (9) gradually presses the outer periphery of the end of the valve (1) to create a dent, and the roller (9) 9) rises to a predetermined height d as shown in FIG. 7(B), a recess (2) with a depth d is formed on the outer periphery of the valve end. Next, the roller (9) descends, leaves the valve (1), returns to its original position, and waits for the next continuously fed valve (1).

In the above operation, if there is a change in the valve size, it is sufficient to change the upward stroke of the roller (9) in accordance with this change. Further, although the valve (1) is continuously fed, it is also possible to form the recessed portion by the roller (9) even if the valve (1) is fed intermittently, and in this case, this can be achieved by simply moving the roller (9) up and down. In addition, although the above operation is an example of forming a recess at one end of the valve (1), the formation of a recess at the other end is performed in the same way, and the recesses (2) (2) at both ends are formed at the same time or sequentially at different positions. It is formed. More rollers (9)
In addition to driven rotation, the valve (4) can also be actively rotated by a driving source, and thereby the rotation of the valve (4) can be assisted.

Next, modified examples of the shaping jig used in the present invention will be explained with reference to FIGS. 8 to 11.

FIG. 8 shows an example in which the recess (2) is formed by a recess (2) of a valve (1) and rollers (12) that come into contact with the outer peripheral surface on both sides of the recess (2). FIG. 9 shows an example in which the recess (2) is formed by a roller (13) having a double chevron-shaped outer periphery cross section that contacts the recess (2) of the valve (1) and the outer peripheral edge of the end of the valve. Such rollers (12) and (13) enable better shaping of the valve end, and in particular rollers (13) in FIG.
) is effective in preventing deformation of the valve edge portion due to shrinkage immediately after stem sealing.

The shaping jig shown in Figure 1O and Figure 11 is composed of a fixed rail member (14).
is arranged in the direction of conveyance of the valve (1), the cross-sectional shape of the upper part is the same as the cross-sectional shape of the roller (9) in FIG. 6, and the height of the upper end is set gradually higher in the direction of conveyance of the valve. In this case, the end of the valve (1) comes into contact with the upper end of the rail member (14) from the lowest point P1 and is then rotated while being pressed by the rail member (14), gradually forming a deeper recess;
Then, the highest point P2 (Pi
The desired recess (2) is formed at the stage when the head distance from d) leaves point d). In this way, the shaping jig can remain fixed, which is advantageous in terms of equipment, and further increases the speed.

As described above in detail, according to the present invention, it is possible to speed up the formation of the gripping recess on the outer periphery of the end of a straight tube bulb, thereby improving mass productivity in manufacturing annular fluorescent lamps. In addition, by adjusting the height of the shaping jig, changes in valve size can be easily accommodated, making equipment management easier.

[Brief explanation of the drawing]

FIG. 1 is a partial cross-sectional side view of a straight tube bulb for manufacturing an annular fluorescent lamp, and FIGS. 2 and 3 show a stem sealing process and a recess forming process for explaining a conventional method for manufacturing an annular fluorescent lamp. 4 is a bottom view of the valve shown in FIG. 3, FIG. 5 is a schematic front view showing a specific example of an apparatus for carrying out the method of the present invention, and FIG. 6 is a view taken from line A-A in FIG. 5. Side view, 7th
The figures are enlarged views of each operation stage in Figure 6, and Figures 8 to 11.
The figures are for showing three modified examples of the shaping jig used in the present invention. Figures 8 and 9 are side views of the two sides, Figure 10 is a front view of another example, and Figure 11 is a front view of another example. 10 is a sectional view taken along line BB in FIG. 10. FIG. (1) - straight pipe valve, (2) - recess, (9), (1
2), (13), (14) - Shaping jig. Continued from page 1 0 Inventor Naomichi Kumagaya 1-1 Umeda, Kita-ku, Osaka
0 Nyx Co., Ltd. Inventor: 1) Manabu Tsugumi 8-17 Nyx Co., Ltd., 1-10 Umeda, Kita-ku, Osaka NEC Home Elect

Claims (1)

[Claims] +11 In a method of forming valve gripping recesses on the outer periphery of both ends of a straight pipe valve in which a stem having electrodes at both ends is enclosed, the straight pipe valve is held substantially horizontally and rotated; 1. A method of manufacturing an annular fluorescent lamp, characterized in that the recesses are sequentially formed to a predetermined depth by pressing a shaping jig against the outer periphery of the end of the shaped bulb from one direction.