JPH019317Y2 - - Google Patents

Description

[Detailed Description of the Invention] A. Field of Industrial Application The present invention is utilized in an annular fluorescent lamp bending device that manufactures an annular fluorescent lamp by bending a straight tube bulb into an annular shape.

B. Prior art The general manufacturing process of an annular fluorescent lamp will be explained from FIGS. 1 and 2. 1 is a turntable;
A large number of sets of two heads 2, 2 are arranged at equal intervals around the outer circumference, and each set of heads 2, 2 is rotated intermittently at the arrangement pitch to move one set of heads 2, 2 to the first position.
Sequentially feed from P ₁ to each subsequent position P ₂ , P ₃ . . . When a pair of heads 2,2 is in the first position _P1 , two straight tubular valves 3,3 are supplied. These straight tube-shaped bulbs 3, 3 have a fluorescent film formed on their inner peripheral surfaces, and a stem having electrodes at both ends is sealed, and an exhaust pipe 4, 4 extending from the stem at the upper end is connected to the head 2, 2. At the same time, by gripping the concave portion on the outer circumference of the upper end of the valve with the chucks 5, 5, the straight tubular valves 3, 3 are held suspended vertically, and in that state, they are moved to the subsequent positions P ₂ , P ₃ .
It is sent intermittently to... For example, the third position
A heating furnace 6 is provided at the ninth position P ₃ to P ₉ , and the two straight tubular valves 3 , 3 heated and softened here are heated to the 2nd position at the 10th position P ₁₀ after leaving the heating furnace 6 .
It is simultaneously bent into an annular shape by two bending drums 7, 7. The curved annular valves 3', 3' are
At each position after position _P11 , various processes such as thermal decomposition by electrode energization, exhaust, mercury supply, gas supply, and tip-off of the exhaust pipe are performed in sequence, and finally the product is taken out from the turntable 1.

For example, a burner group (not shown) is installed in the heating furnace 6, and the bulbs 3, 3 are heated by the burner flame. This valve heating is performed in stages at all positions from the third position _P3 to the ninth position _P9 . Further, although the heating furnace 6 has a bottom, an opening 8 is formed at the bottom in the ninth position _P9 , and a pair of mounting pins 9, 9 are inserted through this opening 8, as shown by the arrows in FIG.
9th position P Go up at ₉ and move to 9th position
It is inserted into the lower end of the straight tubular valves 3, 3 brought in at P ₉ to position the valves 3, 3, and then moved to the 10th position together with the same valves 3, 3.
It moves horizontally in parallel to P ₁₀ , and when the lower end of the straight tubular valves 3, ₃ is checked by the curved drums 7, 7 at the 10th position P 10, it descends and moves away from the valves 3, 3, and returns to the 9th position. Return to P ₉ .

Each music drum 7, 7 in the 10th position P ₁₀ is 2
It has a split structure and is always in a separated state (the fourth
), when the two straight tube valves 3, 3 are carried into the 10th position P ₁₀ , the curved drums 7, 7 are overlapped and the lower ends of the valves 3, 3 are positioned by the mounting pins 9, 9. Chuck the recessed part on the outer periphery with the chuck claw 10,
10, and as shown in FIGS. 5 and 6, it is rotated and raised along the valves 3, 3 to bend the straight tube-shaped valves 3, 3 into an annular shape.

Here, the curved drum 7, which grips the concave portion of the lower end outer periphery of the valves 3, 3 with chuck claws 10, 10,
For example, there is a device shown in FIG. 3 as a device for raising the device 7 while rotating it. In FIG. 3, reference numeral 7 denotes a curved drum, and the curved drum 7 is pivotally supported by a movable block 12. And movable block 1
A guide rail (not shown) that guides the movement of the movable block 1 is vertically installed on the frame 13.
2 is movable up and down along the guide rail.

A pair of sprockets 14 and 15 are driven by hydraulic cylinders (not shown), and are supported by support stands 16 and 17 fixed to the frame 13, respectively. are involved. Although not shown, the movable block 1 is moved based on the movement of the chain 18.
There is a mechanism for raising the rotor 2 and rotating the curved drum 7, and by this mechanism, the curved drum 7 is raised and rotated based on the rotation of the sprockets 14 and 15. Reference numeral 19 designates a speed regulating valve connected to the hydraulic system of the hydraulic cylinder, and its operating portion 19' abuts against a cam 20 coaxially connected to the sprocket 14, and is controlled by the cam 20.

In other words, when the curved drum 7 is raised and rotated to wind up the valve 3, if the curved drum 7 rotates at a constant speed from the beginning of winding the valve 3 to the end of winding, the valve 3 will be Impact is applied and it is destroyed. Therefore, the rotation of the bending drum 7 must be controlled so that it rotates slowly at the beginning of winding the valve 3, rotates quickly during winding, and rotates slowly again at the end of winding.

That is, since the curved drum 7 rotates based on the rotation of the sprocket 14, the curved drum 7 can be rotated by controlling the hydraulic cylinder that drives the sprocket 14.
The rotation speed of will also be controlled.

The drive control of such a hydraulic cylinder is
This is performed by hydraulic system control based on the speed regulating valve 19 that comes into contact with the cam 20.

However, when the same cam 20 is used for valves 3 of different lengths, the position of the cam 3 at the beginning of winding changes due to the difference in valve length, so the speed at which the valve 3 winds up changes slightly, resulting in a change in bending. The shape is not stable.

Therefore, it is necessary to prepare in advance the optimum cam according to the length of the straight tubular valve, and to replace the cam each time the type is changed.

C. Purpose of the invention The purpose of the invention is to create an annular fluorescent lamp that can perform optimal bending work depending on the length of a straight tube bulb with a simple configuration, and that can extremely simplify the work of changing types. The goal is to provide equipment.

D. Structure of the invention The device for bending an annular fluorescent lamp according to the invention bends a straight tubular bulb in a heated and softened state into an annular shape using a bending drum whose winding speed is controlled by a cam linked to a hydraulic mechanism. The cam is characterized in that a crescent-shaped abutment cam is attached to the cam so that its attachment position can be changed.

E. Embodiment An embodiment of the annular fluorescent lamp bending device according to the present invention will be described starting with a speed control cam included therein. As shown in FIG. 7, the cam 21 is a conventional cam 20 in which abutment cams 22, 22 are attached so that the mounting positions thereof can be changed, so that the shape of the cam curve can be changed as appropriate. That is, the two crescent-shaped abutting cams 22, 22 shown in the figure have elongated holes 22a, 22a formed at one end of each, and bolts 23, 23 inserted into the elongated holes 22a, 22a.
By screwing the two contact cams 22, 22 onto the cam 20, one end of each of the two contact cams 22, 22 is disposed on the cam 20.
And each other end 22 of the two contact cams 22, 22
b, 22b are rotatably attached to the cam 20. That is, by loosening the bolts 23, 23, each of the contact cams 22, 22 can be partially rotated within the range of the elongated holes 22a, 22a using the respective ends 22b, 22b as a fulcrum, and from this, a predetermined cam curve can be achieved. The respective abutment cams 22, 22 may be fixed to the cam 20 by tightening the bolts 23, 23 at the positions where the abutting cams 22, 22 are formed.

If the cam 21 thus obtained is coaxially connected to the sprocket 14 in the conventional manner as shown in FIG. 8, an embodiment of the annular fluorescent lamp bending device according to the present invention will be obtained.

The elongated hole 22 of each contact cam 22, 22 is
By moving the mounting positions of a and 22a, the shape of the cam curve may be modified as appropriate so that a predetermined speed control can be obtained.

F. Effects of the invention According to the invention, when controlling the speed of a curved drum using a cam that is linked to a hydraulic mechanism including a hydraulic cylinder, the cam curve can be modified or changed as appropriate using a stop cam. Therefore, when changing the type of valve to be bent, there is no need to select and replace a predetermined cam each time, greatly improving work efficiency.

[Brief explanation of the drawing]

Fig. 1 is a schematic plan view of an annular fluorescent lamp manufacturing apparatus, Fig. 2 is an enlarged partial cross-sectional front view of the heating furnace of the apparatus shown in Fig. 1, and Fig. 3 is a schematic side view of a conventional annular fluorescent lamp bending apparatus. Figure 4 is a partial plan view of the valve exiting the heating furnace in the apparatus shown in Figure 1 and the chuck claw of the curved drum that grips the lower end of the valve;
6 and 6 are cross-sectional views in various operating states of bending a straight tube bulb into an annular shape, and FIG. 7 is a plan view of a cam for speed control included in the annular fluorescent lamp bending device according to the present invention. , FIG. 8 is a partial schematic side view of an embodiment of the annular fluorescent lamp bending device according to the present invention. 3... Straight tubular valve, 7... Drum, 21...
Cam, 22... guess cam.

Claims (1)

[Scope of utility model registration request] In a device that bends a straight tubular valve heated and softened into an annular shape using a bending drum whose hoisting speed is controlled by a cam linked to a hydraulic mechanism, a crescent-shaped abutment cam is attached to the cam and the mounting position is changed. 1. A bending device for an annular fluorescent lamp, characterized in that the bending device is attached so that the lamp can be bent.