JPH043055B2 - - Google Patents

Description

[Detailed Description of the Invention] (a) Field of Industrial Application The present invention relates to a method for molding a bulb for an annular fluorescent light, and more specifically, the present invention relates to a method for molding a bulb for an annular fluorescent light, and more specifically, it involves shaping a straight bulb into an annular shape while continuously moving it in a horizontal state. Regarding the method.

(b) Prior Art In the conventional manufacturing process for annular fluorescent lights, the method of forming a tube or bulb into an annular shape involves placing a number of chucks that hold one end of the bulb around the outer periphery of a turret that rotates intermittently, spaced apart in the circumferential direction. The chuck holds the upper end of the valve so that the valve is vertical, and a heating device is installed around the outer periphery of the turret to heat the valve when the turret is intermittently stopped. is heated, and when the bulb comes out of the heating device and stops intermittently at the forming position, a winding drum holding one end of the bulb is rotated and raised to form the heated bulb into an annular shape. However, in such a conventional method, since the valve must be wound up when the turret is intermittently stopped, there is a problem in that the manufacturing speed is low and efficiency cannot be improved.

As a method to solve such problems, as described in Japanese Patent Publication No. 52-18513,
A method has been proposed in which two bulbs are held at a time by a chuck and molded two at a time, but this method requires intermittent rotation of the turret to heat and mold the bulbs one after another, making it slow. Atsup has its limits.

(c) Problem to be solved by the invention The problem to be solved by the invention is to heat the valve while supporting it in a horizontal position and continuously moving it, and to continuously move the valve after heating in a horizontal position by continuously rotating the turret. The aim is to improve the molding speed of the valve by molding the valve into an annular shape using a winding drum attached to the turret while conveying the valve.

(d) Means for Solving the Problems The present invention provides a method for forming an annular fluorescent light bulb in which a straight glass bulb is heated and then formed into an annular shape, in which the bulb is supported horizontally. The valve is heated by being continuously moved through the heating furnace, the heated valve is supported horizontally by a continuously rotating turret, and the winding drum attached to the turret is continuously transferred. It is configured to be wound and molded into an annular shape.

(e) Examples A method of molding a bulb for an annular fluorescent light according to the present invention will be described below with reference to the drawings.

FIG. 1 schematically shows an apparatus 1 for carrying out the method for forming an exhaust pipe according to the invention. In the figure, reference numeral 2 denotes a transfer device that transfers the valves in a horizontally lying state at predetermined intervals, 4 a heating device disposed above the transfer device, and 6 a molding machine.

As shown in FIG. 3, the transfer device 2 includes a pair of endless chains 23 and 24 guided by a pair of guide plates 21 and 22 and connected to each other by a plurality of connecting rods 25 arranged at predetermined intervals. It is constructed by arranging two double chain conveyors 20 in parallel. As shown in Fig. 1, each chain of this double chain conveyor is hooked on one drive sprocket (double type) 26 and one idle sprocket (double type) 27, and is rotated in a fixed direction by the action of these sprockets. It is becoming more and more like this.

Each connecting rod 25 has, as shown in FIG.
A pair of support blocks 28 and 29 are mounted to which are substantially horizontally mounted a pair of long mounting rods 30 extending substantially perpendicular to the direction of travel of the chain. Between the tip of the attachment rod 30 and the tip of a similar attachment rod of another double chain conveyor (not shown), a pair of support rods 31 (only one is shown) are installed parallel to each other and parallel to the attachment rod 30. It is attached via 32.

As shown in FIG. 3, a valve a is placed on the pair of support rods 31 in a horizontal position. Both ends of the valve are support rods 3
It is held by valve chucks 33 disposed near both ends of the valve 1. This valve chuck 33 is of a known structure in which the tube body is held in place by a pair of holding claws that can be opened and closed, and the valve chuck 33 is a link between the links of the chain to which the mounting rod 30 and the support rod 31 are attached. (not shown). One valve chuck (right or left in Figure 3) is installed with some play so that it can be held even if the valve is extended.

The heating furnace 4 is provided in the middle of the transfer device,
It has a known structure including a furnace body disposed above and below the tube transfer path and a plurality of burners attached to the furnace body.

As shown in FIG. 2, the molding machines 6 are arranged facing each other and separated from each other (at a distance larger than the length of the valve), and are rotatable with the same axis line by supports 61 and 62, respectively. It is equipped with a pair of turrets 63 and 64 supported by.
These turrets 63 and 64 are synchronously rotated in the same direction and at the same speed by a drive mechanism of a known structure (not shown).

On the periphery of one turret 63, a plurality of winding drums 65 having a structure similar to the winding drum of a conventional valve molding machine are provided at intervals in the circumferential direction. Each winding drum is conventionally provided with a chuck (not shown) for gripping one end of the valve. The other turret 64 has a turret 6
A rod 66 is attached to each position corresponding to the position of the winding drum No. 3 so as to be movable in a direction parallel to the axis of rotation. At one end of each rod 66 on the turret side there is a chuck 67 for gripping the other end of the valve.
is installed.

In the above configuration, the valves a are held horizontally by the transfer device 2 and sequentially sent in the direction of the arrow x, and are heated to a predetermined temperature while passing through the heating device 4. The heated valve a is delivered to the chuck (not shown) of the take-up drum 65 of the turret 63 of the molding machine 6 and the chuck 67 of the turret 64, and is held by these chucks, and is rotated in the direction of arrow Y by continuous rotation of the turret. are sent continuously. As shown in FIG. 3, a method of transferring the valves from the transfer device 2 to each chuck of the molding machine 6 is as shown in FIG. 33
At the same time as opening, the transfer plate 7 is moved and the end is inserted into the chuck of the winding drum of the molding machine which is open and waiting, and the other chuck 67.

When the valve a is held in the chuck of the molding machine and the turrets 63 and 64 begin to rotate, the winding drum begins to rotate at a peripheral speed faster than the speed of the chuck 67.
Rolling and forming is started from one end of the valve (the right end in FIG. 2), and the forming is performed while continuously moving due to the continuous rotation of the turret. When winding and molding begins, the other end of the valve moves toward one end while being held by the chuck as the molding progresses.

The valve that has been completely rolled and formed is removed from the chuck of the forming machine at the discharge position and sent to the subsequent process.

Note that, as in the past, _N2 gas is fed from an exhaust pipe chuck 68 that moves in pair with the valve chuck 67 to apply pressure inside the valve to prevent the softening valve from collapsing during molding.

(f) Effects A turret equipped with a large number of winding drums is continuously rotated, and the heated and softened valve is continuously transferred and rolled up, which eliminates the conventional intermittent drive,
High-speed molding is possible compared to fixed-position molding.

[Brief explanation of drawings]

FIG. 1 is a schematic illustration of an apparatus for carrying out the method of molding a bulb for a fluorescent light according to the present invention, FIG. 2 is an elevational view of the molding machine, and FIG. 3 is a diagram showing a bulb transfer device. 1... Molding device, 2... Transfer device, 4... Heating device, 6... Molding machine, 63, 64... Turret, 65... Winding drum.

Claims (1)

[Claims] 1. In a method for forming an annular fluorescent light bulb in which a straight glass bulb is heated and then shaped into an annular shape, the bulb is supported horizontally and continuously moved through a heating furnace. The method is characterized in that the heated bulb is supported in a horizontal state by a continuously rotating turret, and is continuously transferred while being wound into an annular shape by a winding drum attached to the turret. A method of molding a bulb for annular fluorescent lights.