JPH0329014B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a heat sealing device used for sealing a glass bulb such as an electron tube and a sealed component such as an electron gun.

[Technical background of the invention and its problems] Conventionally, when sealing a glass bulb such as an electron tube and an electron gun, the glass bulb is held in a bulb holder, while the electron gun is attached to the tip of a mount holder. The sealing area of the glass bulb is then surrounded by crossfires made up of a combination of several single burners, and the area around the sealing area is uniformly heated and welded. things were being done.

The welding device used in such a method is as follows: (a) As shown in FIG. 3, a pair of line burners 1, 1 are arranged with the sealing part 2a of the glass bulb 2 in between, with the nozzle 1a side facing each other; A device configured to rotate these line burners 1, 1 around the sealing part 2a as shown by the arrow to uniformly heat and weld the sealing part, and (b) FIG. As shown in the figure, a pair of line burners 1, 1 are arranged with the nozzle 1a side facing each other with the sealing part 2a of the glass bulb 2 in between, and these line burners 1, 1 are fixed, and the glass bulb 2 is As shown by the arrow, a device is used that is configured to rotate around the neck portion to uniformly heat and weld the sealing portion.

However, in these conventional devices, either the line burner 1, 1 or the glass bulb 2
Because it is structured to rotate one of the
There has been a problem in that welding accuracy tends to deteriorate due to non-uniform heating due to misalignment of the tip of the burner frame, mechanical fluctuations in the initial setting position of the glass bulb, etc.

In addition, in such a method, the burner rotation mechanism,
This requires complex mechanisms such as a fuel supply mechanism to the rotating burner and a rotating mechanism for the glass bulb, which makes the entire device complex and makes maintenance difficult.

[Object of the Invention] The present invention has been made to solve these conventional problems, and an object of the present invention is to provide a heat sealing device that has a simplified burner rotation mechanism and is capable of high-precision welding. shall be.

[Summary of the Invention] That is, the heat sealing device of the present invention includes: a bulb holder that holds a glass bulb; a mount holder that holds a sealed component in a sealed portion of the glass bulb held by the bulb holder; A heat sealing apparatus comprising a burner having a plurality of nozzles arranged surrounding a sealed portion of a glass bulb, and a rotation drive device that rotates the burner along the outer periphery of the glass bulb. A ring-shaped line burner has a plurality of nozzles arranged inward on the same circumference at approximately equal intervals, and the rotation drive device rotates the ring-shaped line burner at a predetermined rate along the outer periphery of the glass bulb. By using a swinging device that rotates forward and backward within an angle, it is possible to prevent uneven heating due to misalignment of the tip of the burner frame, and a decrease in welding accuracy due to mechanical fluctuations in the initial setting position of the glass bulb. This is a simplified version of the configuration.

[Embodiment of the Invention] An embodiment of the present invention will be described below as shown in the drawings.

FIG. 1 is a side view showing the configuration of an embodiment of the present invention;
FIG. 2 is a plan view showing the main parts thereof.

In these figures, 3 is a bulb holder that holds a glass bulb 4 like a brown tube, and includes a horizontal support part 3a that holds the panel part of the glass bulb 4 and a vertical support part 3b that supports the base of the funnel. The glass bulb 4 is held substantially vertically with its neck facing downward.

5 is a known ring-shaped line burner,
A large number of nozzles 5a are arranged on the same circumference at approximately equal intervals in the direction of the cutting line of the sealed portion.

Reference numeral 6 denotes a rocking device for the ring-shaped line burner 5, which includes a turntable 7, a support shaft 8 having a through hole in the center, the upper part of which is fixed to the turntable 7, and the lower part rotatably supported. It is comprised of a forward/reverse mechanism 9 that rotates the turntable 7 forward and backward within a predetermined rotation angle, and a vertical drive mechanism 10 that moves the turntable 7 up and down.

The turntable 7 has a disc shape with a through hole in the center, and horizontally supports the ring-shaped line burner 5 via a support 7a.

The support shaft 8 is vertically supported by a bearing 11 fixed within the machine frame, and the upper end is connected to the turntable 7.
A cam follower 13 of the vertical drive mechanism 10 is fitted into a cylindrical cam follower receiver 12 that is coaxially fitted and fixed into a through hole of the cylindrical cam follower receiver 12 whose lower end is fixed to its outer periphery.
It is rotatably supported by.

The forward/reverse mechanism 9 includes two guide rods 1 fixed to the edge of the turntable 7 parallel to its rotation axis.
4, a slider 15 slidably attached to these guide rods 14, and one end of which is attached to the slider 1.
5, the apex of the L shape is rotatably supported on a pedestal 17 fixed under the machine frame, and one end of the L shape is pivotally connected to the other end of the link 16, An L-shaped lever 19 with a cam follower 18 provided at the other end of the L-shaped lever, a heart cam 20 that swings the cam follower 18 of the L-shaped lever 19 within a predetermined rotation angle α, and a motor 21 that rotates this heart cam 20. It is configured.

The vertical drive mechanism 10 includes a cam follower 13 that is engaged with a cam follower receiver 12 at one end of the L shape, and an L-shaped lever 23 whose apex is pivoted to a support base 22 provided below the machine frame. This L-shaped lever 2
The air cylinder 24 has an L-shaped other end attached to the operating end of a piston 24a.

Reference numeral 25 denotes a mount holder that is disposed through the support shaft 8, and is configured to be capable of being raised and lowered by an up-and-down drive mechanism (not shown) with an electron gun 26 attached to its upper end.

Although not shown, a flexible tube for gas supply is connected to the ring-shaped burner 5, and the flexible tube opens when the vertical drive mechanism is in the vertical position.
A solenoid valve is provided which is closed when in the lowered position. Further, the ring-shaped burner 5 is provided with a pilot burner to which gas is supplied through a flexible tube of a separate system.

Next, the operation of the heat sealing apparatus of the present invention will be explained.

First, the glass bulb 4 is attached to the bulb holder 3, and the electron gun 26 is attached to the tip of the mount holder 25, which is in the lowered position, and raised.
It is held in a predetermined sealing part within the neck part. Next, the air cylinder 24 is operated and the ring-shaped burner 5 is
is raised to a predetermined sealing part of the neck part of the glass bulb 4, the motor 21 is driven to swing the ring-shaped line burner 5 within a predetermined rotation angle α, and gas is supplied to the ring-shaped line burner 5. to uniformly heat the sealed portion of the glass bulb 4.

After heating and sealing the sealing part in this way, the ring-shaped burner 5 and the mount holder 25 are lowered in the reverse order to the above, and the neck part of the glass bulb 4 below the welding part is moved from the mount holder 25. Remove it and prepare for sealing the next glass bulb 4.

Since the heat sealing device of the present invention is configured as described above, neither the bulb holder nor the ring-shaped line burner requires a rotation mechanism, so the entire device can be configured simply. Fuel gas can be supplied to the ring-shaped line burner using conventional flexible tubes. Furthermore, since the burner is ring-shaped, even if the rotation angle is small,
The entire circumference of the welded part can be heated uniformly, and the rotation angle of the ring-shaped line burner can be small, improving welding accuracy.

[Effects of the Invention] As explained above, the heat sealing device of the present invention can heat the sealing portion of a glass bulb with high precision, has a simple configuration, and is easy to operate and maintain. I can do it.

[Brief explanation of drawings]

Fig. 1 is a side view of an embodiment of the present invention, Fig. 2 is a plan view showing the main parts thereof, Fig. 3 is a plan view schematically showing the main parts of a conventional heat sealing device, and Fig. 4 FIG. 2 is a plan view schematically showing the configuration of another conventional heat sealing device. 3...Bulb holder, 4...Glass bulb,
5... Ring type line burner, 6... Rocking device,
7... Turntable, 8... Support shaft, 9... Forward/reverse mechanism, 10... Vertical drive mechanism, 11... Bearing, 12... Cam follower support, 13, 18...
Cam follower, 14... Guide rod, 15... Slider, 16... Crank arm, 19, 23
... L-shaped lever, 20 ... Heart cam, 21 ...
Motor, 24...Air cylinder, 25...Mount holder, 26...Electron gun.

Claims (1)

[Claims] 1. A bulb holder that holds a glass bulb;
a mount holder that holds a sealed part in a sealed part of a glass bulb held in the bulb holder; a burner having a plurality of nozzles arranged surrounding the sealed part of the glass bulb; In the heat sealing apparatus, the burner is a ring-shaped line burner in which a plurality of nozzles are arranged inward on the same circumference at approximately equal intervals. and a heat sealing apparatus characterized in that the rotation drive device is a swing device that rotates the ring-shaped line burner forward and reverse within a predetermined rotation angle along the outer periphery of the glass bulb. 2. A rocking device includes a turntable on which a ring-shaped line burner is mounted, a support shaft whose upper part is fixed to the turntable and whose lower part is rotatably supported, and one end of which is attached to the turntable or support shaft in the vertical direction. 2. The heat sealing apparatus according to claim 1, comprising: a crank arm pivotally mounted to allow relative movement of the crank arm; and a drive mechanism for reciprocating the crank arm. 3. The heat sealing device according to claim 1 or 2, wherein the mount holder is provided with a drive mechanism that moves the tip up and down toward the sealed portion of the glass bulb held in the bulb holder. mounting device. 4. The heat sealing device according to any one of claims 1 to 3, wherein the sealed component is an electron gun.