JPH03297052A - Pinch seal machine - Google Patents

Abstract

PURPOSE:To provide a pincher machine having a small inertia under movement by driving pinchers through a cam and a link mechanism, mounting the cam and a motor for driving it on a base frame, and thereby reducing the weight of the moving parts. CONSTITUTION:Three or more burners 3 are furnished, and pinchers 4 move between them. Therein no driving mechanism for moving the burners 3 is required. The pinchers 4 are driven through a cam 6 and a link mechanism 5, wherein the link mechanism 5 turns in butt contact with the periphery of the cam 6, so that their butt contacting and separation can be obtained simply. Accordingly the burners 3 and pinchers 4 and the link mechanism 5 can be installed on a traveling table 2, and the driving mechanism including cam 6 and motor 61 mounted on a base frame 1. This reduces the weight of the moving parts of the pinch seal machine, which can thus be achieved with a small inertia under movement.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a pinch sealing machine used for forming a crimp seal 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 the enclosure, and both ends of the quartz glass tube are pinch-sealed to form a crimp seal. is forming. This pinch sealing operation is performed using a pinch sealing machine equipped with a burner that heats the glass tube and a pair of pinchers that press the heated glass tube.

In a conventional pinch sealing machine, two burners are arranged opposite to each other, and a timer is used to heat the crimp-sealed portion of the glass tube for a predetermined period of time, and then the pincher is disposed opposite to each other to crimp it. Therefore, the part where the flame shines directly becomes high temperature and there is a temperature difference with the part perpendicular to the burner, but it is necessary to press the high temperature part with pinchers. For this reason, the part of the glass tube heated by the burner and the part crimped by the pinchers are in the same direction, making it impossible to cross the burner and pinchers.In other words, the burner moves after heating and the pinchers moves to that position. Therefore, a drive mechanism for moving the burner and the pincher, and a drive mechanism for moving the pincher toward and away from each other are required, and a drive mechanism consisting of an air cylinder and a link is provided.

By the way, when automating the pinch seal work.

It is necessary to arrange holders in a row on the conveyor, and to move the pincher and burner relative to the glass tubes held in a vertical position by the holders. That is, the pincher and burner advance toward the conveyor to position the glass tube between the burners, and once the pinch seal is completed, the pincher
The burner moves back and the holder moves to the next process. Therefore, a movable table on which a burner and a pincher are arranged is slidably arranged on a base, and this movable table is slid back and forth.The drive mechanism for the pincher and burner consists of an air cylinder and a link. must also be placed on the moving platform.

For this reason, the weight of the moving part becomes large and a large amount of power is required to drive the moving platform, but since the inertia during movement is large, it is difficult to move with large acceleration and decelerate rapidly. This is an obstacle to cycling up. Furthermore, there is a problem in that the vibration during movement is large and it is difficult to stop the device accurately at a predetermined position. Furthermore, since the air cylinder also moves, it is necessary to use a long, flexible air hose for piping, and as the air cylinder bends each time it is moved, the lifespan of the air hose is shortened.

[Purpose of the invention]

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a pinch sealing machine in which moving parts are lightweight and have small inertia during movement.

[Structure of the invention and its operation]

The configuration of the present invention is a pinch seal machine in which pinchers arranged opposite to each other press a glass tube for a seal heated by a burner to form a crimped seal, and a movable table is slidably disposed on a base. The moving table is provided with a pair of pinchers that move between three or more burners and a link mechanism that drives the pinchers, and the base is provided with a plate-shaped cam and a link mechanism that drives the cam. When the rotating motor is attached and the moving stage slides to position the envelope glass tube between the pinchers, the link mechanism abuts against a predetermined position on the cam circumference, and the pinchers approach as the cam rotates. It is characterized by a separation movement.

In such a pinch sealing machine of JITl construction, first, since there are three or more burners and the pincher moves between the burners, there is no need for a drive mechanism for moving the burners. Then, the pincher is
The cam is plate-shaped, and the link mechanism rotates against the circumferential surface of the cam, so it is easy to connect and separate the link mechanism and the cam, and the burner and pincher are mounted on the moving table. A link mechanism can be attached, and a drive mechanism such as a cam and a motor can be attached to the base. In other words, since the force 11 and the drive mechanism such as the motor can be separated from the movable table, the movable part becomes lightweight and the inertia during movement is small, resulting in various advantages.

〔Example〕

The present invention will be specifically described below based on embodiments shown in the drawings.

FIG. 1 shows the pinch sealing machine of the present invention in a standby state.
A quartz glass enclosure with an assembly placed inside the filament 1. The glass tube G is held vertically by a holder 9, and the lower end of the glass tube G is pinch-sealed. Then, attach the metal foil of the assembly to the filament 1 so that it is positioned at the lower end of the glass tube G.

A chuck 91 grips the lead of the filament assembly protruding from the lower end opening of the glass tube G.

The holders 9 are arranged in a line on a conveyor (not shown), and are sequentially moved in the direction of the arrow each time a pinch sealing operation is completed.

The base 1 is fixedly arranged near the holder 9, and 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 arranged so as to be slidable along the rails 11. has been done. On base 1.

A motor 61 is attached to the rotating shaft 6 of the plate-shaped cam 6.
4 is connected to a motor 61 via a clutch 63 and a reducer 62 whose rotational speed can be freely controlled. power ts
G is symmetrical with respect to the one-rotation axis 64, and is approximately gourd-shaped, and the circumferential surface thereof is a cam profile.

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

On the plate 21 around the notch 21a, four burners 3, in which flames are formed with oxygen gas and hydrogen gas, are arranged radially at equal angles, and the flames are directed toward the center of the four burners 3. It is designed to radiate light. In addition, a water-cooled pincher holder 4 is mounted on a pair of sliding tables 41.
2 is fixed, and the pincher 4 is fixed to the pincher holder 42.
is installed. Then, the moving table 41 is connected to the rail 2
2, the pinchers 4.4 pass between the burners 3 and move towards and away from them;
Note that piping for cooling water and gas is not illustrated.

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 table 41 of the pincher 4, and a cam follower 51 is attached to the other end. Further, a spring 52 is disposed between the links 5.5, and as shown in FIG. 51.51 is the force l
It is designed to firmly abut against the circumferential surface of the cam profile by sandwiching the x6. Therefore, cam 6
When the link 5 rotates, the link 5 rotates around the shaft 53, and when the cam follower 51.51 collides with the cam 6 in the longitudinal direction, the pinchers 4, 4 approach, and when they collide with the cam 6 in the longitudinal direction. However, the shape of the cam 6 is similar to that of the pinchers 4, 4.
When it approaches, it decelerates, and then holds it in a crimped state for a while,
It is designed to rapidly dissociate after normality is completed. Furthermore, since the cam 6 is symmetrical about the U rotation axis 64, the left and right links 6.6 synchronize and perform the same symmetrical movement.

In this way, the drive v1 of the cam 6, motor 61, etc.
Since the structure is attached to the base 1, the movable parts including the movable base 2 and the pinchers 4 attached to the movable base 2 are lightweight. Furthermore, since an air cylinder is not used, there is no need for an air hose with a short lifespan.

Then, the movable table 2 slides in the direction of the holder 9 by a drive mechanism (not shown), and as shown in FIG. , cam follower 51.
51 accurately abuts the cam 6 at a predetermined position. At this time,
Since the movable part is lightweight, the movable table 2 moves with high acceleration, rapidly decelerates, and stops accurately and quietly at a predetermined position. Then, the burner 3 is ignited, and the four flames F surround the glass tube G to uniformly heat it.

When the glass tube G rises to a predetermined temperature of about 25oO℃, the burner 3 extinguishes the flame, and at the same time, the clutch 63 connects almost at the same time as the extinguishment, the cam 6 rotates, and the pincher 4.4 decelerates. The heated glass tube G is pressed and held for a short time to form a flat crimp-sealed portion in which the metal foil of the filament assembly is embedded.

Even after crimping is completed, the cam 6 continues to rotate, and the pincher 4
, 4 rapidly disengage and return to their original positions, clutch 6
3 separates and the cam 6 stops.

After that, the moving table 2 moves back and returns to the state shown in Fig. 1, but
At this time as well, the movable table 2 moves with high acceleration, rapidly decelerates, and stops. On the other hand, the holder 9 also moves and the glass tube G to be processed next is placed in the notch 21 of the plate 21.
One cycle is completed by stopping before a.

〔Effect of the invention〕

As explained above, in the pinch sealing machine of the present invention, the pincher is driven by a cam and a link mechanism, and the cam and its driving mechanism, such as the motor, are mounted on the base.
The moving parts are lighter, the moving platform moves with large accelerations and decelerations, stops, cycles up, and moves quietly without vibrations.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of the standby state of the pinch sealing machine. FIG. 2 is an explanatory diagram of the operating state. 1... Base 2... Moving base 3... Burner 4... Pincher 5... Link 6... Cam 6
1...Motor 9...Holder G...Glass tube for enclosure

Claims (1)

[Claims] In a pinch sealing machine in which pinchers arranged opposite to each other press a glass tube for a seal heated by a burner to form a crimped seal, a movable table is slidably disposed on a base. The moving table is provided with a pair of pinchers that move between three or more burners and a link mechanism that drives the pinchers, and the base is provided with a plate-shaped cam and a motor that rotates the cam. is attached, and when the moving table slides and the glass envelope tube is positioned between the pinchers, the link mechanism abuts against a predetermined position on the cam circumference, and the pinchers move toward and away from each other as the cam rotates. A pinch seal machine featuring: