JPH07161297A - Method and device for preliminary working of cathode-ray tube - Google Patents

Abstract

PURPOSE:To attain sealing accurately without cutting off a neck tube, in a gas sealing process after inserting an electron gun. CONSTITUTION:A neck tube cutting off position is set with a reference line 34 on a funnel 24 serving as the reference. An internal surface of a yoke part 26 is brought up by a head 22 and positioned to fix a neck tube. A cut-in is formed in a neck tube internal surface by a cutter part 46 to cut off a neck tube external surface heated by a gas burner.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to preprocessing for mounting an electron gun on a cathode ray tube, and more specifically to a method and apparatus for preprocessing a cathode ray tube relating to a technique for cutting a neck tube during a cathode ray tube manufacturing process. Is.

[0002]

2. Description of the Related Art Generally, a cathode ray tube before an electron gun is incorporated has a seal edge surface (SE surface: Seal Edg).
e surface: A cylindrical neck tube is sealed to the reduced diameter portion of the funnel portion provided with the face plate butting and sealing surface) opposite to the SE surface. This neck tube has
Sufficient length is given to facilitate dimensioning for positioning the electron gun, and in order to facilitate insertion of the electron gun, the flare portion is enlarged by expanding the opening to a trumpet shape. Has been formed. For this reason, after the insertion of the electron gun, a process of cutting off unnecessary portions of the neck tube is required after performing sealing by gas processing.

[0003]

However, in such a conventional electron gun sealing process, after inserting the electron gun into the neck tube, the flare portion of the neck tube is set to the lower side and the neck tube is closed with a gas burner. In the process of heating and cutting off the unnecessary part of the neck tube, the scattering of the film-shaped glass not only causes a serious defect that it adheres to the shadow mask and causes clogging, but it is also important as an environmental problem. Issues that must be raised have been raised.

Therefore, in order that the neck tube can be sealed without being cut off, the dimensional accuracy of the funnel is increased to minimize the variation, and the straight tubular neck tube without flare is accurately cut into a certain size. Requires connection to funnel.

In this case, dimensional accuracy control in the manufacturing process of the funnel and neck tube becomes an important issue. However, in a normal funnel pressing device, the roundness of the diameter-reduced portion (yoke) of the funnel is different, and good accuracy cannot be obtained in the dimension when the connecting end of the neck tube is shaped. Moreover, it is difficult to say that the accuracy of the cutting device for a normal neck tube is sufficient. Therefore, comprehensively sealing the neck pipe to the funnel by adding the neck pipe and satisfying the height dimension from the reference line to the open end of the neck within the predetermined accuracy includes an error during the addition process. , Yield and Bonnie management are very difficult.

According to the present invention, in the gas sealing step after inserting the electron gun, the neck tube can be sealed without being cut off, and the factor causing the variation in the manufacturing step can be eliminated, so that the conventional productivity is not deteriorated. It is an object of the present invention to provide a good quality cathode ray tube with Bonnie control by pre-processing with high accuracy.

[0007]

In order to achieve the above object, the present invention provides a cathode ray tube after connection with a neck tube, which is an uninspected product in which the seal edge surface of the funnel is unpolished and the dimension of the product is not measured. On the funnel, change the reference line to eg EIA
J standard specification line, positioning the reference line of the cathode ray tube as a reference point, measuring in the height direction of the cathode ray tube from the reference line to set the cutting position of the neck tube, and setting in the step It is characterized in that it comprises a step of cutting the neck tube at the cut position and a step of baking the cut surface of the neck tube.

Therefore, a self-propelled roller conveyor for horizontally placing and transferring the funnel with the seal edge surface facing downward, and the cathode ray tube are lifted from the roller conveyor, and the reference line specified on the funnel is predetermined. The apparatus is composed of a member that moves to the reference position of 1. and a member that cuts the neck tube at a predetermined height set from the reference position. This apparatus includes a burner for convoluting the cut surface, which is provided with double concentric tip rows corresponding to the inner diameter and the outer diameter of the neck tube.

[0009]

The reference line specified on the funnel of the cathode ray tube after the neck tube is connected (in the present invention, a state in which the neck tube is connected to the funnel is called a cathode ray tube) is designated by EI.
By using the AJ standard reference line, the relative position with the electron gun is determined. Therefore, by setting the cutting position of the neck tube with this reference line as a reference point, the attachment position of the electron gun can be uniquely and accurately determined.

The electron gun can be easily inserted by rolling the cut surface of the neck tube with a burner. Moreover, since the burner is equipped with double tips that match the inner and outer diameters of the neck tube, foaming or coloring does not occur due to glazing even when heated for a short time, and the product value is not impaired.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a cathode ray tube pre-processing apparatus according to the present invention will be described below with reference to the drawings. FIG. 1 is a front view of a neck tube cutting device 1 that cuts the neck tube at a predetermined height from a reference line. 10 is a cathode ray tube 1 to be processed
It is a roller conveyor that transfers 2 and runs just below the processing table 14. In the present embodiment, the workpiece is illustrated as moving by its own weight on the inclined surface that descends in the traveling direction, but a self-propelled type in which the individual rollers 16 rotate by power may be used. Reference numeral 18 denotes a funnel lifting cylinder provided with a piston 20 which is controlled to move in and out vertically by air pressure.

The roller conveyor 10 is provided with a gap in the operating range of the piston 20. The head 22 at the tip of the piston 20 is positioned below the roller conveyor 10 in a rest state, and receives the signal that the transferred cathode ray tube 12 has stopped at a fixed position. It is formed so as to be fitted inside the reduced-diameter yoke portion 26 and to support the funnel 24 from the inside so that the CRT 12 can be moved up and down. Reference numeral 28 is a measuring rod which works in conjunction with the potentiometer 30 to control the moving distance of the head 22. Reference numeral 32 denotes a yoke ring, which abuts the outer surface of the yoke portion 26 and cooperates with the measuring rod 28 to set the position of the reference line 34.

Reference numerals 36 and 36 denote support plates for sandwiching and fixing the neck pipe 38 from both sides, which are opened and closed by a cylinder 40 which is installed on the working table and operated by air pressure. A V-shaped notch is provided on the edge of the support plate 36 that abuts on the neck tube, and the neck tube is automatically centered when the neck tube 38 is clamped. A cutter head 42 is capable of vertically moving the cutter rod 44 in the vertical direction, and its stop position can be controlled.
Further, the cutter rod 44 is mounted with a cutter portion 46 for engraving a scratch mark at a predetermined position on the tube wall of the neck tube 38, and is driven to rotate normally and reversely by a rotary drive device 48.

The cutter portion 46, as shown in detail in FIG. 2, has a diamond cutter foil 50 attached thereto in a known and replaceable manner. The cutter wheel 50 is attached by a known means so that the blade edge of the cutter escapes when the cutter rod 44 rotates in the reverse direction and bites into the wall of the neck tube 38 when the cutter rod 44 rotates in the normal direction. In order to prevent the biting resistance from exceeding a predetermined value, a torque limiting member is provided at the joint portion between the rotary drive device 48 and the cutter rod 44. Reference numeral 52 is an air jet nozzle, which sends compressed air through a conduit 54 and blows off dust such as cutting powder scattered during the cutting work so that it does not remain on the neck pipe wall and is fused to the pipe wall in the next heating step. Prevent.

On the working table 14, the outer surface of the neck tube 38 is heated to generate stress due to residual working strain of the tube wall, and is connected to a burner (not shown) for cutting off unnecessary portions of the neck tube and an intake pipe 56. A nozzle (not shown) that sucks and discharges the cutting dust of the glass fine powder is provided.

A glazing device 2 for shaping the cut end of the neck pipe 38 is arranged downstream of the roller conveyor 10 in parallel with the neck pipe cutting device 1. FIG. 3 shows a front view of the glazing device 2. Similarly to the case of the neck tube cutting device 1, the glazing device 2 is also provided with a funnel elevating cylinder 62 below the working table 60, and a piston 64 that is vertically controlled by air pressure.

As with the neck tube cutting device 1, the roller conveyor 10 running below the processing table 60 has a gap in the operating range of the piston 64. Piston 64
The head 66 of the front end of the CRT is positioned below the roller conveyor 10 in the rest state, and the CRT 12 transferred after finishing the cutting process of the neck tube 38 receives the signal that the CRT 12 is stopped at the fixed position, and then the CRT 12 is moved. The configuration in which the head 66 is moved up and down and the moving distance of the head 66 is controlled by the measuring rod 68 and the potentiometer 70 is exactly the same as in the case of the neck tube cutting device 1.

Reference numerals 72 and 74 are concentric and stepped yoke rings having different inner diameters.
The cathode ray tube 12 is fixed by abutting the outer surface of 6 and sandwiching the yoke portion with the head 66 that pushes up the yoke portion 26 from the inside. The yoke rings 72 and 74 having different inner diameters are brought into contact with two portions on the outer side of the yoke portion 26, and the intermediate position of these contact portions is pressed from the inner side by the head 66 against the yoke rings 72 and 74. 38 is vertically self-aligned.

Reference numeral 76 is a glazing burner for rolling and rolling the cut surface of the neck tube, which is set to a predetermined height from the yoke ring 72 and is rotated in one direction by a motor 78 while maintaining the height. FIG. 4 is an enlarged cross-sectional view of the glazing burner 76, and FIG. 5 is a plan view of the glazing burner 76 of FIG. 4 viewed from below (arrow A). Reference numeral 80 denotes a joint including a connection screw 82 for connecting to the gas pipe, a gas passage 84, and a space provided with a cap screw 86 on the peripheral wall. The nozzle tip holder 88 is screwed into the space by screwing the outer screw 90 into the cap screw 86 of the joint 80 and until the surface 92 on the gas introduction side is in close contact with the abutment surface 94 defining the space end of the joint 80. Can be fixed by.

Further, a space 96 having an enlarged diameter is provided between the gas passage 84 and the contact surface 94, and the nozzle tip holder 88 is provided.
Gas is distributed to the plurality of nozzle tips 102 embedded on the circumference of concentric circles 98 and 100 (see FIG. 5) provided in two rows. The nozzle tip 102 embedded in the nozzle tip holder 88 is provided with a gas passage 104 in the center as shown in an enlarged sectional view of FIG. Notch 108, reduced diameter space 110, through hole 112
Are air paths that together help the combustion of gas. The diameters of the two rows of concentric circles 98 and 100 in which the nozzle tips 102 are arranged correspond to the outer diameter and the inner diameter of the neck tube 38.

Next, the procedure for processing the neck tube using the CRT tube pre-processing apparatus according to the present invention will be described. First, a reference line 34 (see FIG. 1) serving as a reference is marked on the outer surface of the yoke portion. The cathode ray tube 12 in which the neck tube 38 is sealed to the funnel 24 is arranged in the roller conveyor 1 with the seal edge side facing downward.
Transported by 0.

When a sensor (not shown) detects the Braun tube 12 just below the processing table 14 of the neck tube cutting device 1, for example, a stopper (not shown) is projected above the transfer surface of the roller conveyor to allow the Braun tube 1 to move.
Stop 2. Next, the operation of the piston 20 causes the head 22 to protrude from between the rollers 16 to support the inner surface of the yoke portion 26 and ascend to the yoke ring 32.
The outer surface of 6 is brought into contact, and the reference line 34 sets a reference line in the height direction.

When the cylinder 40 is operated, the neck tube 38 is sandwiched between the support plates 36, 36, and vertically aligned and fixed. The cutter rod 44 is lowered by the rotation driving device 48 while rotating the cutter portion in the reverse direction, and the neck tube 3
8 and is stopped at a defined height above the reference line 34. During this time, since the cutter blade is in the escape direction, it does not damage the neck tube.

At this stop position, the cutter rod 44 is rotated forward by 360 °, and a linear scratch mark is formed on the inner surface of the neck tube 38. The position of this scratch mark is located at the exact cut-off distance from the reference line 34. As a result, the cutter portion 46 is raised while the cutter rod 44 is rotated in the reverse direction of the cutter blade again. During operation of the cutter rod 44, dust such as cutting dust is blown off by the air flow from the air ejection nozzle 52, and is sucked by the decompression pump via the intake pipe 56.

After the cutter portion 46 has separated from the neck tube and has been lifted, a flame of a gas burner (not shown) is applied to the outer surface of the neck tube 38 to cut unnecessary portions of the neck tube by the stress of internal strain. After that, the cylinder 40 operates and the support plates 36, 36
Releases the neck tube 38. Then, the piston 20 is pulled in by the operation of the lifting cylinder 18, and the head 22 holds the yoke portion 26 from the inside and the roller conveyor 1
As it descends to a position below 0, the cathode ray tube 12 is returned onto the roller conveyor 10 and transferred to the next glazing device 2.

CRT 12 with the neck tube 38 cut off
However, when the roller conveyor 10 comes directly under the processing table 60 of the glazing device 2, a sensor (not shown) detects the position and operates the stopper in the same manner as in the case of the neck cutting device 1 to stop the CRT 12. . Next, the elevating cylinder 62 operates to cause the piston 64 to project, and the head 66 raises the cathode ray tube 12 by supporting the inner surface of the yoke from between the rollers 16.

At the end of the piston 64 set by the measuring rod 68, the head 66 presses the two outer surfaces of the yoke portion 26 into the inside of the yoke rings 72 and 74, so that the neck tube 38 is vertically aligned and fixed. To be done.
At this time, the glazing burner 76 is located above the neck tube 38, at a spaced position facing the cut surface at a predetermined height such that the tip of the flame from the nozzle tip 102 reaches the cut surface of the neck tube 38, and is vertical. It is rotating around its axis.

FIG. 7 shows an ignited glazing burner 7
When the flame of No. 6 is jetted downward from a predetermined height and the cut surface of the neck pipe 38 located at a predetermined distance below the tip opening 102 and directed upward is heated, the neck pipe 38 is heated. It is shown in cross section. Since the glazing burner 76 is rotated by the motor 78, the cut surface of the neck tube 38 is uniformly heated. Further, since the glazing burner 76 has the nozzle tips 102 arranged on the two rows of concentric circles 98 and 100 corresponding to the outer diameter and the inner diameter of the neck tube 38, the cut surface of the neck tube is heated in a short time. However, glazing can be performed without causing defects such as foaming or coloring, and the electron gun can be easily inserted.

FIG. 8 is a longitudinal sectional view showing a cross section of a neck tube 38 having an end portion 38a rounded into a shape that allows easy insertion of an electron gun. Each operation of the neck tube cutting device 1 and the glazing device 2 described above can be electrically performed automatically by sequence control.

[0030]

As described above, the pre-processing method and apparatus for a cathode ray tube according to the present invention does not seal the funnel and the neck tube whose dimensions are accurately determined separately, but the funnel and the neck tube. After sealing, the neck tube was cut according to the standard dimension from the reference line as the reference point, so in the process of cutting off unnecessary parts of the neck tube after inserting the electron gun, There is no concern that the scattering will damage the shadow mask, and environmental problems can be improved. Moreover, in the gas sealing process after inserting the electron gun in the customer process, it is possible to provide a good quality cathode ray tube with minimal variation in dimensional accuracy that can be sealed without cutting off the neck tube.

[Brief description of drawings]

FIG. 1 is a front view of a neck tube cutting device according to the present invention.

FIG. 2 is an enlarged sectional view of a cutter portion in the neck tube cutting device according to the present invention.

FIG. 3 is a front view of a glazing device according to the present invention.

FIG. 4 is an enlarged sectional view of a glazing burner in the glazing device according to the present invention.

5 is a plan view of the glazing burner of FIG. 4 as seen from below (arrow A).

FIG. 6 is an enlarged sectional view of the nozzle tip of the glazing burner according to the present invention.

FIG. 7 is a side view showing a part in section for explaining the operation of the glazing burner according to the present invention.

FIG. 8 is a cross-sectional view showing a cut portion of a neck tube which is rolled by a glazing burner according to the present invention.

[Explanation of symbols]

 1: Neck tube cutting device 2: Glazing device 10: Roller conveyor 12: Braun tube 14: Processing table 18: Lifting cylinder 20: Piston 22: Head 24: Funnel 26: Yoke part 32: Yoke ring 34: Reference line 36: Support Plate 38: Neck Tube 40: Cylinder 46: Cutter 48: Rotational Drive 60: Processing Table 62: Lifting Cylinder 64: Piston 66: Head 72: Yoke Ring 74: Yoke Ring 76: Glazing Burner 78: Motor 88: Nozzle Tip holder 102: Nozzle tip

Claims (4)

[Claims] 1. The funnel seal edge surface is unpolished,
The step of locating the reference line on the funnel of the cathode ray tube after connecting the neck tube, which is an uninspected product whose dimensions have not been measured, and positioning the reference line of the cathode ray tube as a reference point, and the height direction of the cathode ray tube from the reference line. A Braun tube characterized in that it comprises a step of measuring the cutting position of the neck tube, a step of cutting the neck tube at the cutting position set in the step, and a step of baking the cutting surface of the neck tube. Pre-processing method. 2. The preprocessing method for a cathode ray tube according to claim 1, wherein the reference line is specified as an EIAJ standard reference line. 3. The funnel seal edge surface is unpolished,
Braun tube after connection of the neck tube, which is an uninspected product of unmeasured product dimensions, the seal edge surface is directed downward, a roller conveyor for horizontally mounting and transferring, and the Braun tube is lifted from the roller conveyor, Preliminary processing of a cathode ray tube comprising a member for moving a reference line specified on the funnel to a predetermined reference position and a member for cutting the neck tube at a predetermined height set from the reference position. apparatus. 4. A spare for a cathode ray tube according to claim 3, further comprising a concentric double row of chips corresponding to an inner diameter and an outer diameter of the neck tube, the burner including a burner for rounding a cut surface. Processing equipment.