JPH03297051A - Pinch seal machine - Google Patents

Abstract

PURPOSE:To enhance the quality and the yield from the production line by arranging pinchers as opposed so that they advance between three or more burners arranged radially at equal angle intervals, and interrupting combustion at the burners with the motions of the pinchers sensed. CONSTITUTION:A pinch seal machine according to the present invention is composed of three or burners 3 arranged radially at equal angle intervals and pinchers 4 arranged being opposed so that they advance between the burners 3 to generate pressure contact of a glass tube for sealing G which has been heated, wherein the burners 3 are so controlled as to interrupt the combustion through sensing of the motions of the pinchers 4. Therein the glass tube G is heated uniformly to achieve less unevenness of the heating temp., and it is not required to put the direction of heating with the burners 3 identical to the direction of pressure contacting by the pinchers 4, and further the burners 3 interrupt the combustion upon sensing the motions of the pinchers 4, so that pressure contact can be made at the same time substantially as completion of the heating resulting in elimination of time loss. This allows maintaining stable sealing conditions, improves the quality, and enhances the yield.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a pinch sealing machine used for forming a positive sealing part of a light bulb.

[Prior art and its problems]

For example, in a tubular halogen incandescent light bulb used as an exposure light source in an electrophotographic copying machine, a filament assembly is placed inside a quartz glass tube for an enclosure, and both ends of the quartz glass tube are pinch-sealed to form a positive seal. is formed. This pinch sealing operation is performed using a pinch sealing machine equipped with a burner that heats the glass tube and a pincher that presses the heated glass tube.

The conventional pinch seal machine will be explained based on Fig. 7.
A quartz glass tube G for an enclosure, in which a filament assembly is disposed, is held vertically by a holder 110, and its lower end is pinch-sealed. At this time, in order to prevent oxidation of the filament assembly, a pair of burners 101 and 1 are attached to a rotating plate 10G through which nitrogen gas is flowing from a branch pipe II extending laterally from the glass tube G.
A pair of pinchers 102 are arranged opposite to each other with the glass tube G at the center, and are driven by a link mechanism 105.
102 is also disposed below the burners 101, 101, facing each other in the same direction. When the glass tube G is heated to a predetermined temperature by the burners 101, 101, the first air cylinder 1
03 is activated. Therefore, the rotating plate 106 rotates around the shaft 106a, and the burners 101, 101 also rotate and spring up. At the same time, an air cylinder (not shown) is activated, and the pinchers 102, 102 are heated up to the heating value. At the same time, the second air cylinder 104 is activated, and the link mechanism 105 rotates around the shaft 105a, causing the pinchers to heat up to the heating value. −
102 and 102 approach each other and press the heated glass tube G to form a flat press-sealed portion.

In this way, since there is a pair of burners (two burners), the part directly in contact with the flame becomes high temperature, and there is a temperature difference between the part perpendicular to the burner and the part that is perpendicular to the burner, but it is necessary to press the high humidity part with pinchers. For this reason, the portion of the glass tube heated by the burner and the portion pressed by the pincher are in the same direction, making it impossible to arrange the burner and pincher in a crossed manner. In other words, after heating, the burner moves and the pinchers move to that position. Therefore, it is difficult to accurately adjust the burner operating position and the pincher operating position, the operating mechanism is complex, and vibrations are large during movement, and it takes 0.4 seconds from heating to crimping. It takes a certain amount of time, and there is a time loss. Moreover,
Since the burner is moved by an air cylinder, the time it takes to move the burner varies depending on changes in air pressure and room temperature. For this reason, a glass tube heated to a high temperature of about 2500℃,
Since nitrogen gas flows inside, the temperature rapidly drops during this time, and the time loss varies, making it impossible to maintain stable sealing conditions. Also, since there are two burners.

The heating temperature of the glass tube was uneven, and cracks sometimes appeared when the tube was crimped, resulting in a low yield in the pinch sealing process.

[Purpose of the invention]

SUMMARY OF THE INVENTION Therefore, it is an object of the present invention to provide a pinch sealing machine that can maintain stable sealing conditions with less uneven heating temperature, no time loss from heating to compression, and has a high yield.

[Structure of the invention and its effects]

The pinch sealing machine of the present invention includes three or more burners radially arranged at equal angles so that flames are radiated toward a glass envelope tube held vertically, and one burner 171. ) Pinchers are arranged opposite to each other so as to press the glass tube for the enclosure heated at an advance of η, and the burner is controlled so as to detect the movement of the pinchers and interrupt the combustion. It is characterized by:

That is, three or more burners are arranged radially at equal angles, and the flames are radiated toward the glass tube, so that the glass tube is heated uniformly and unevenness in heating temperature is reduced. Therefore, it is not necessary to match the direction of heating with the burner and the direction of pressure bonding with the pinchers, and the pinchers can move forward between the burners to pressure bond the glass tube. Therefore, there is no need to move the burner after heating is completed, there is no need to adjust the burner operating position and the pincher operating position, and there is no need for complicated waste equipment drying. and,
The burner detects the movement of the pincher and interrupts combustion, so it can be crimped almost at the same time as heating is completed, eliminating time loss, allowing stable sealing conditions to be maintained, improving quality, and making cracks less likely to occur. Manufacturing yield is also improved. [Examples] The present invention will be specifically described below based on examples shown in the drawings.

In FIG. 1, a quartz glass tube G for an enclosure, in which a ficimen 1 assembly is arranged, is held vertically by a holder 9, and the lower end of the glass tube G is pinch-sealed. Then, the lead of the filament assembly protruding from the lower end opening of the glass tube G is held in the chuck 9 so that the metal foil of the filament assembly is located at the lower end of the glass tube G.
1 is holding it. The holders 9 are arranged in a line.

Each time the pinch sealing work is completed, it moves sequentially in the direction of the arrow.

The base 1 is placed near the holder 9.

A pair of rails 11 are provided on the upper surface of the base 1 facing the holder 9, and the movable table 2 is disposed so as to be movable along the rails 11. A cam motor 61 is attached to the base 1, and a rotating shaft 64 of the cam 6 is connected to a clutch 63 and a reducer 6.
It is connected to the cam motor 61 via 2. The cam 6 has a substantially all-concave shape, and its peripheral surface is a cam profile. The rotation shaft 64 has a rotation detection plate 71 in which a large number of small through holes 72 are bored on the same circumference near the outer circumference.
is fixed. In addition, a U-shaped rotational position detection sensor 7 consisting of a floodlight lamp and a pulse count sensor is installed.
are attached to sandwich the rotation detecting plate 71, so that when the cam 6 rotates, the rotating plate can be detected.

A plate 21 in which a U-shaped notch 21a is formed is attached to the end of the moving table 2.

Then, on play 1-21 around the notch 21a,
4 burners 3 where the flame is formed by oxygen gas and hydrogen gas
are arranged radially at equal angles so that the flame radiates toward the center of the four burners 3. The number of burners 3 may be three or more, and in any case, the glass tube G at the center of the burners 3 can be uniformly heated. Further, a water-cooled pincher holder 42 is attached to a pair of sliding tables 41, and the pincher 4 is fixed on top of this pincher holder 42. and,
The moving table 41 is movably arranged along the rail 22, and the pinchers 4, 4 move toward and away from the burners 3. In other words, even when the pinchers 4 move, the burners 3 The burner 3 and pincher 4 are arranged on one plate 21 surface, and the pincher 4 moves on the plate 21 surface. Since it moves, there is no need to adjust the burner operating position and the pincher operating position. Note that piping for cooling water and gas is not shown.

Next, a pair of substantially dogleg-shaped links 5 are rotatably attached to the movable table 2 about a shaft 53 erected thereon. One end of the link 5 is pivotally supported by the sliding base 41 of the pincher 4, and a cam follower 51 is attached to the other end. Further, a spring 52 is arranged between the links 5, 5, and the elastic force of the spring 52 causes the cam followers 51, 51 to firmly abut against the circumferential surface of the cam 6. Therefore, when the force ts G rotates, the link 5 rotates, and when the cam followers 51, 51 collide with each other in the longitudinal direction of the cam 6, the pinchers 4, 4 approach, and when they collide with the cam 6 in the longitudinal direction, they separate. 6 In other words,
The movement of the pinchers 4, 4 is linked to the rotation of the cam 6,
Since the rotating plate of the cam 6 is detected by the sensor 7,
The movement of the pinchers 4, 4 is also detected by the sensor 7.

Then, the movable table 2 is moved in the direction of the holder 9 by the engine end (not shown), and as shown in FIG.
Located in the center of the cam follower 51.51
collides with the cam 6 at a predetermined position. The following operating order is the 5th
Explaining based on the flowchart shown in Figure (A),
First, the burner 3 is ignited, and as shown in Fig. 3, the four-wooden flame F surrounds the glass tube G and heats it uniformly.
At the same time, the timer operates, and after a predetermined time, the cam motor 6
1 starts, and sensor 7 starts counting pulses. That is, the sensor 7 detects the movement of the pincher 4, and when the pincher 4 reaches a position immediately before crimping the glass tube G, the burner 3 is extinguished based on the signal from the sensor 7. Then, as shown in Fig. 4, the pinchers 4, 4 press the heated glass tube G, and a flat crimped sealing part in which the metal foil of the filament assembly is embedded is formed, and a pinch seal is formed on one end side. is completed.

In this way, there is no time loss from heating to crimping, and crimping can be carried out at a constant heating temperature, so together with the fact that the glass tube G is heated uniformly, cranking is less likely to occur, and sealing conditions can be met. There is no variation and quality is improved. Furthermore, since there is no temperature drop between heating and compression bonding, there is an advantage that the maximum heating temperature is low.

Even when crimping is completed, the cam 6 continues to rotate, and the pincher 4
, 4 are separated and returned to their original positions, the clutch 63 is separated and the cam 6 is stopped. Thereafter, the moving table 2 moves back and returns to the state shown in FIG. 1, the holder 9 also moves, and the glass tube G to be processed next stops in front of the cut 21a of the plate 21, completing one cycle. .

Note that instead of the rotational position detection sensor 7 consisting of a floodlight lamp and a pulse count sensor, as shown in FIG.
A microswitch 8 for confirming the position of the pinchers may be arranged on the plate 21 to directly sense the movement of the link 5 to detect the movement of the pinchers 4. The flowchart in this case is shown in FIG. ), the pincher 4 presses the glass tube G immediately after the burner 3 is extinguished.

〔Effect of the invention〕

As explained above, the pinch sealing machine of the present invention includes three or more burners arranged radially at equal angles so that the flame is radiated toward the glass tube for the enclosure, and the pinch sealing machine moving between the burners. The burner is controlled to detect the movement of the pinchers and interrupt combustion, so that the glass tube is evenly heated and , time loss from heating to crimping is eliminated. Therefore, stable sealing conditions can be maintained, quality is improved, cracks are less likely to occur, and manufacturing yields are also improved.

[Brief explanation of the drawing]

1 and 2 are perspective views of an embodiment of the present invention, FIG. 3 is an explanatory diagram of a heated state, FIG. 4 is an explanatory diagram of a crimped state, FIG. 5 is a flowchart, and FIG. 6 is another embodiment. FIG. 7 is an explanatory diagram of a conventional example.

Claims (1)

[Claims] Three or more burners radially arranged at equal angles so that flames are radiated toward a glass envelope tube held vertically; A pinch sealing machine comprising pinchers arranged opposite to each other so as to press a heated glass sealing tube, the burner being controlled to detect movement of the pinchers and interrupt combustion. .