JP2653429B2 - Bulb holder for cathode ray tube - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a bulb holder for a cathode ray tube used in a sealing step of welding and sealing a neck portion of a bulb for a cathode ray tube and a stem portion of an electron gun. .

(Prior Art) As a conventional bulb holder used in a cathode ray tube sealing step, there is a structure described in, for example, Japanese Utility Model Application Laid-Open No. 58-178263.

FIGS. 5 and 6 show the structure of such a valve holder.
This will be described with reference to the drawings.

5 and 6, when the valve 11 is fixed, the valve 11 is first placed on the receiving base 12, and the neck portion is centered by the neck chuck 13 provided on the receiving base 12. Next, a corner of the valve 11 is pressed by the pusher 15 so that the outer periphery of the valve 11 comes into contact with three valve stoppers 14 provided facing the outer periphery of the valve 11. By this operation, the centering of the valve 11 and the positioning in the rotation direction about the pipe axis are performed. In addition, the sealing position in the tube axis direction (hereinafter referred to as a sealing length) is determined by the position of the pedestal 12 with reference to the position of the electron gun 16.

(Problems to be Solved by the Invention) However, since the conventional valve holder shown in FIGS. 5 and 6 has the above-described configuration, the valve size,
If any one of the deflection angle and the sealing length is different, the valve holder itself must be replaced or adjusted. For this reason, there are problems such as the need for a valve holder corresponding to the number of pipe types, and the need for a pipe-type select conveyor in an automated line.

However, in the structure described in the above-mentioned publication, two types of valve stoppers are arranged at the positions of the respective valve stoppers so as to protrude in opposite directions, and one or the other of the two types of valve stoppers is selectively used. By doing this, it is possible to handle two types of pipes, but it can only handle two types of pipes, and when handling different types of pipes, the above-described replacement and adjustment are required There is a problem. In addition, the two valve stoppers at each position must be manually selected, and incorrect selection may result in poor positioning of the valve.

In the valve sealing step, the valves are sequentially held in a plurality of valve holders arranged along the periphery of the rotary table which is intermittently fed, and the intermittent feed of the rotary table causes the neck portion of the valve and the stem portion of the electron gun. Are sequentially sealed.

In such a sealing step, when trying to seal a valve of a different pipe type, in the valve holder described in the above publication, after stopping the feed of the rotary table,
There is a problem that adjustment of the valve stopper and the like must be performed manually.

In addition, in the sealing process, since a plurality of valve holders are arranged on a rotary table, downsizing and weight reduction of the valve holders are indispensable. Therefore, application of a mechanism that involves an increase in size and weight, for example, a pipe type It is considered difficult to apply a mechanism for automatically chucking different valves.

SUMMARY OF THE INVENTION An object of the present invention is to provide a cathode ray tube bulb holder that can be used in a multi-tube type, in which the positioning and holding of the bulb can be automatically performed in accordance with the type of the bulb, and the size and weight can be reduced. To provide.

(Means for Solving the Problems) A bulb holder for a cathode ray tube according to the present invention is provided with a rotation direction positioning mechanism for performing centering and positioning in a rotation direction about a tube axis according to the type of bulb, and a rotation direction positioning mechanism. A tube axis direction positioning mechanism for moving the mechanism in the direction of the tube axis of the valve to perform positioning in the tube axis direction, wherein the rotation direction positioning mechanism is provided with a receiving portion through which a neck portion of the valve is inserted to support the valve. A base, a neck chuck provided on the receiving base, for centering the neck of the valve, and a valve stopper opposed to four sides of the outer periphery of the valve and arranged symmetrically with respect to a center point for centering the valve And an expansion / contraction mechanism disposed around the cradle and configured to symmetrically expand / contract the opposed valve stopper with respect to the center point. Is provided.

Further, the cathode ray tube bulb holder of the present invention is disposed on the rotating table, a plurality of the cathode ray tube bulbs are positioned and held, and the cathode ray tube bulb neck and the electron gun stem portion are intermittently fed by the rotating table. A cathode-ray tube holder used in a sealing step of sealing a cathode-ray tube, wherein a rotation direction positioning mechanism for performing centering and positioning in a rotation direction about a tube axis according to the type of the bulb for the cathode ray tube; A tube axis direction positioning mechanism for performing positioning in the tube axis direction by moving a positioning mechanism in the tube axis direction of the valve, wherein the rotation direction positioning mechanism is inserted through a neck portion of the valve and supports the valve. A pedestal, a neck chuck provided on the pedestal for centering a neck portion of the valve, A valve stopper opposed to four sides of the outer periphery of the valve and arranged symmetrically with respect to a center point for centering the valve; and a valve stopper arranged around the pedestal and allowing the opposed valve stopper to move with respect to the center point. And an enlarging / reducing mechanism for performing symmetrical enlarging / reducing operation.

(Function) In the bulb holder for a cathode ray tube according to the present invention, the valve is supported by the pedestal of the rotation direction positioning mechanism, the neck of the valve is centered by the neck chuck, and the valve is moved by the valve stopper which is expanded and contracted by the expansion and contraction mechanism. Centering by tightening from all sides and positioning in the rotational direction about the pipe axis. further,
The rotation direction positioning mechanism that positions and holds the valve by the tube axis direction positioning mechanism is moved in the tube axis direction of the valve,
Set the sealing length in the tube axis direction to an arbitrary length. This provides a multi-tube type bulb holder for a cathode ray tube which can automatically perform positioning and holding of the valve according to the type of the bulb. In addition, by disposing the expansion and contraction mechanism around the pedestal, the expansion and contraction mechanism can be disposed without affecting the pedestal into which the neck portion of the valve is inserted, and the expansion and contraction mechanism can be efficiently disposed and downsized. .

In addition, such a compact and lightweight cathode ray tube bulb holder can be applied to a sealing process of sealing the neck portion of the cathode ray tube bulb and the stem portion of the electron gun by intermittent feeding of the rotary table, The sealing process of valves of different pipe types can be performed automatically and continuously.

(Embodiment) An embodiment of the present invention will be described below with reference to FIG. 1 to FIG.

In FIG. 1, reference numeral 19 denotes a rotation direction positioning mechanism for centering the valve 11 and positioning the valve 11 in the rotation direction. A detailed structure will be described below with reference to FIGS. 2 and 3.

Reference numeral 20 denotes a frame-like frame, and two slide bars 2 on four sides thereof.
Reference numerals 1 and 22 are provided so as to be able to move in parallel toward a predetermined center point 23. A valve stopper 24 is provided on the inner side of each of the slide bars 21 and 22 so as to oppose the outer four sides of the valve 11.

Reference numeral 26 denotes an expansion / contraction mechanism that causes the valve stoppers 24 for the four sides to expand / contract symmetrically with respect to the predetermined center point 23, respectively.
The outer periphery of the valve 11 is brought into contact with four sides. here,
The predetermined center point 23 is a point at which the center of the pipe axis of the valve 11 should coincide in a tightened and fixed state described later.

Reference numerals 27 and 28 denote rotating rings whose center of rotation is the center point 23.
One rotating ring 27 is connected to a short-side slide bar 21 via a rod 29, and the other rotating ring 28 is connected to a long-side slide bar via a rod 30. Connects to bar 22. These rotating rings 27 and 28 can be rotated independently of each other, and the
The corresponding slide bars 21, 22 are moved symmetrically with respect to the center point 23 via 9, 30. Therefore, the valve stoppers 24 provided on the slide bars 21 and 22 also expand and contract symmetrically with respect to the center point 23 as described above. Further, springs 32 are respectively stretched between the rotating rings 27 and 28 and the frame body 20, and the rotating rings 27 and 28 rotate rightward in the drawing by the springs 32, that is, slide bars. 21 and 22 and a valve stopper 24 integral therewith is subjected to a force in a direction of moving toward the center point 23.

33 is a cradle, which is the conventional cradle shown in FIG. 5 and FIG.
It is almost the same as 12, and has a neck chuck 34 integrally. The support plate portion 33a of the receiving table 33 is also used to support the above-described rotating rings 27 and 28. A rotation direction positioning mechanism 19 is provided around the receiving table 33.

Returning to FIG. 1, reference numeral 35 denotes a tube axis direction positioning mechanism, which moves the above-described rotation direction positioning mechanism 19 along the tube axis direction of the valve 11 (vertical direction in the drawing), and at any position (height). It is configured to be able to stop at. That is, reference numeral 36 denotes a gantry, and a slide guide 38 for guiding and supporting a rod 37 integrated with a lower part of the rotation direction positioning mechanism 19 so as to be able to move up and down is provided at the upper part.

Numeral 39 denotes a ball screw, which is attached to the lower side of the gantry 36 in a vertical direction, and is rotationally driven by a directly connected pulse motor 40. The ball screw 39 is screwed with a female screw body 41 integrated with the lower end of the rod 37, and the female screw body 41 is rotated by its rotation.
The rod 37 and the rotation direction positioning mechanism 19 integrated therewith are moved up and down via the.

In the above configuration, when loading the valve 11, first, the slide bars 21, 22 are pulled outward, and all the valve stoppers 24 are expanded in all directions. In this state the valve
11 is loaded onto the receiving table 33 from above, and the neck chuck 34 performs centering and holding of the neck portion.

Next, when the slide bars 21 and 22 are returned, the valve stopper 2
4 contacts the four sides of the outer periphery of the valve 11, tightens the valve 11 by the force of the spring 32, performs centering and positioning in the rotation direction, and finally holds the valve 11.
Here, the slide amount of the slide bars 21 and 22 and the number and height of the valve stoppers 24 are designed according to the common pipe type of the valve 11 to be held.

Next, the valve 11 is moved in the tube axis direction to set the sealing length. That is, by operating the pulse motor 40 and rotating the ball screw 39, the slide guide 38
The rod 37 guided and supported by the shaft and the rotation direction positioning mechanism 19 integrated therewith also move up and down. Therefore, the valve 11 held by the rotation direction positioning mechanism 19 also moves along the pipe axis direction. In this case, if the amount of movement from a predetermined position (origin) is set in advance for each pipe type, the sealing length is automatically set simply by inputting the pipe type data of the valve 11 to be held. be able to.

Next, FIG. 4 shows another embodiment. In this embodiment,
This is an example of a case where the rotation direction positioning mechanism 19 and the tube axis direction positioning mechanism 35 are configured on an intermittently driven rotary table 43 used in a mass production system. In this example, a gear 44 is used instead of the pulse motor for driving the ball screw 39.
And a ratchet 45.

In this configuration, the intermittent operation of the rotary table 43 causes the gear 44 to mesh with a pulse motor (not shown) provided at a specific position and a gear driven by the gear, thereby driving the ball screw 39 to rotate and moving the valve 11 up and down. To set the sealing length. The ratchet 45 is for preventing the valve 11 from descending naturally by its own weight,
When driving, the ratchet 45 is released by an external operation.

That is, this embodiment is applied to a mass production system in which a plurality of valves 11, an electron gun structure, and the like are arranged on a rotary table 43 and a predetermined process is performed at each position by an intermittent feeding operation.

In the bulb holder for a cathode ray tube as described above, the valve 11 is supported by the pedestal 33 of the rotation direction positioning mechanism 19, the neck portion of the bulb 11 is centered by the neck chuck 34, and the expansion and contraction operation is performed by the expansion and contraction mechanism 26. The stopper 11 is used to center the valve 11 by tightening it from all directions and perform positioning in the rotational direction about the tube axis.Furthermore, the rotational direction positioning mechanism 19 that positions and holds the valve 11 by the tube axis direction A multi-tube type shared type that can be moved in the tube axis direction and the sealing length in the tube axis direction can be set to any length, so that the positioning and holding of the valve 11 can be performed automatically according to the tube type Can be provided. Therefore, there is no need to replace a valve holder according to a production pipe type or to provide a select conveyor for each pipe type in an automation line as in the related art, thereby improving productivity in multi-pipe production.

Moreover, the shape of the valve 11 has a space around the neck portion with respect to the panel portion, and that space is effectively used,
Expansion mechanism 26 with cradle 33 and neck chuck 34, etc.
The cathode ray tube bulb holder can be reduced in size and weight.

(Effects of the Invention) According to the present invention, the valve is supported by the pedestal of the rotation direction positioning mechanism, the neck of the valve is centered by the neck chuck, and the valve is moved in all directions by the valve stopper that is expanded and contracted by the expansion and contraction mechanism. From the center of the valve, and perform positioning in the rotational direction about the tube axis.Furthermore, the rotational direction positioning mechanism that positions and holds the valve by the tube axis direction positioning mechanism is moved in the direction of the tube axis of the valve. The sealing length can be set to an arbitrary length, and therefore, it is possible to provide a bulb holder for a multi-tube type cathode ray tube which can automatically perform positioning and holding of the bulb according to the bulb type. Moreover,
The valve has a space around the neck part with respect to the panel part, and the space can be effectively used, and the expansion and contraction mechanism can be arranged together with the cradle and the neck chuck, so that the size and weight can be reduced. .

Further, the cathode ray tube bulb holder which can be reduced in size and weight can be applied to a sealing step of sealing the neck portion of the bulb for the cathode ray tube and the stem portion of the electron gun by intermittent feeding of the rotary table. Various kinds of valve sealing processes can be performed automatically and continuously.

[Brief description of the drawings]

FIG. 1 is a front view showing an embodiment of a cathode ray tube bulb holder according to the present invention, FIG. 2 is a plan view of a rotation direction positioning mechanism, FIG. 3 is a front view of a rotation direction positioning mechanism, and FIG. FIG. 5 is a front view of a conventional apparatus, and FIG. 6 is a plan view of the conventional apparatus. 11 ... Valve, 16 ... Electron gun, 19 ... Rotation direction positioning mechanism, 23 ... Center point, 24 ... Valve stopper, 26 ... Expansion / retraction mechanism, 33 ... Cradle, 34 ... Neck chuck, 35 …… tube axis direction positioning mechanism, 43 …… rotary table.

Claims (2)

(57) [Claims] 1. A rotating direction positioning mechanism for performing centering and positioning in a rotating direction about a tube axis in accordance with a tube type of a cathode ray tube bulb, and moving the rotating direction positioning mechanism in the tube axis direction of the bulb. And a tube axis direction positioning mechanism that performs positioning in the tube axis direction.The rotation direction positioning mechanism is provided on the pedestal through which a neck portion of the valve is inserted to support the valve. A neck chuck for centering the neck portion of the valve; a valve stopper opposed to four sides of the outer periphery of the valve and symmetrically arranged with respect to a center point for centering the valve; A cathode-ray tube, comprising: an expansion / contraction mechanism for symmetrically enlarging / reducing the opposed valve stopper with respect to the center point. Valve holder. 2. A seal for positioning and holding a plurality of cathode ray tube bulbs on a rotary table, and sealing the neck of the cathode ray tube bulb and the stem of the electron gun by intermittent feed of the rotary table. In the cathode ray tube bulb holder used in the process, a rotation direction positioning mechanism that performs centering and positioning in the rotation direction about the tube axis according to the type of the bulb for the cathode ray tube; and A tube axis direction positioning mechanism for moving the tube in the tube axis direction to perform positioning in the tube axis direction, the rotation direction positioning mechanism comprising: a pedestal through which a neck portion of the valve is inserted to support the valve; A neck chuck provided on the base and centering a neck portion of the valve; and opposed to four sides of an outer periphery of the valve A valve stopper arranged symmetrically with respect to a center point for centering the valve, and an expansion / contraction mechanism arranged around the receiving table and configured to operate the opposed valve stopper symmetrically with respect to the center point. A bulb holder for a cathode ray tube, comprising: