JP2000294125A - Method and apparatus for assembling aperture grille - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an apparatus and a method for assembling an aperture grille surely assembling a flat aperture grille with an aperture grille frame and preventing wrinkles or strut failure from being generated. SOLUTION: In this apparatus, first and second pins 14 and 15 are held by a direct action bearing 28 to be vertically movable and are supported by a compression spring 9 to be the floating state. Thereby, as a flat aperture grille 1 is rising, the first pin 24 is freely arisen by its friction with a positioning hole. The second pin 25 is also freely arisen by its friction with a width direction tension hole 13 so that distortion is not generated in the flat aperture grille 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for assembling an aperture grill used as a color selection electrode of a color picture tube.

[0002]

2. Description of the Related Art A grid-shaped aperture grill is used inside a color picture tube as an electrode for selecting an electron flow emitted from an electron gun by color. Aperture grills are extremely precise and extremely dimensional.On the other hand, the size of the aperture grille is almost the same as the screen size of the color picture tube. Something has been devised.

A conventional method of assembling an aperture grill and an assembling apparatus for the same will now be described with reference to FIGS.
FIG. 7 shows a shape of an aperture grille 100 similar to that disclosed in Japanese Patent Application No. 9-358129 filed by the present applicant before assembly. For the sake of convenience in the following description, as shown in FIG. 7, a long aperture grill 100 composed of a flat aperture grill 1 made of a rectangular thin metal plate and an aperture grill frame 2 assembled in a rectangular frame shape. The direction is X, the width direction is Y, and the direction perpendicular to these is Z.

In FIG. 1, reference numeral 3 denotes a curved frame for providing a required curved surface to the flat aperture grille 1, and reference numeral 4 denotes a connecting frame for connecting the two curved frames 3.
The curved frame 3 and the connection frame 4 are integrally welded as shown in FIG.

FIG. 8 shows details of the flat aperture grill 1. The flat aperture grille 1 has at least one set of positioning holes 5 at the center of the edge in the X direction (edge in the width direction) and a long axis in the X direction, in addition to the central lattice portion (also called the last slit). At least two to four width-direction tension holes 13 having an elliptical shape are machined. The slits 6 and perforations 7 at both ends are for cutting off these line portions at the time of completion of assembly.

FIG. 9 is a view showing a method of assembling the aperture grill 100 disclosed in the above-mentioned application. To assemble the aperture grille 100, first, the curved frame 3 is placed on the base 99 with the curved surface facing upward and positioned. After that, the bending frames 3 are pressed by a pressing block (not shown) from the side direction (arrows described as pressing in the figure), and the bending frames 3 are deformed so as to approach each other within the elastic deformation range. At this time, the connection frames 4 are distorted in directions away from each other.

Next, as shown in FIG. 10, the positioning pins 19 and the width direction tension pins 14 are inserted into the respective positioning holes 5 and the width direction tension holes 13 while keeping the flat aperture grill 1 horizontal. And a pair of positioning pins 1
The 9 and 2 pairs of width direction pulling pins 14 respectively move to the outside of the base 99 to apply a tension in the Y direction (width direction) to the flat aperture grill 1.

Next, the four corners of the flat aperture grill 1 are connected to an eccentric roller 17 as shown in FIG.
The two sets of four chuck mechanisms 15 each consisting of 8 hold. Then, as shown in FIG. 12, the two chuck mechanisms 15 facing each other in the X direction are connected by an air cylinder 98 floating from the base 99, and these are placed on a guide 97 that can freely move in the X direction. Then, the air cylinder 98 is separated from the base 99 so that the pulling force of the air cylinder 98 acts as an internal force. Thereby, only the tension in the X direction is applied to the flat aperture grill 1 as an internal force, and no useless force acts on the flat aperture grill 1 with the outside (for example, the base 99), thereby preventing displacement in the length direction (X direction). I can do it.

The chuck mechanisms 15 on both sides of the flat aperture grill 1 approach each other in the X direction, and
Flat aperture grill 1 between roller 7 and concentric roller 18
Is held, the eccentric roller 17 is rotated to grip the flat aperture grill 1. Concentric roller 18
Cannot be rotated by the stopper in the direction in which the flat aperture grille 1 comes out, so that the grip is completed.

[0010] After the gripping by the chuck mechanism 15 is completed, the chuck mechanisms 15 move in opposite directions in the X direction to generate tension in the flat aperture grill 1 in the X direction. Since the chuck mechanism 15 can apply a uniform tension over the entire length of the grip portion, the flat aperture grill 1 does not generate wrinkles or scratches. Thereafter, the pressure of the positioning pin 19 and the pressure of the air cylinder (not shown) for the width direction pulling pin 14 are made equal on both sides to eliminate the positioning reference. However, since the degree of freedom of the chuck mechanism 15 is restricted in the Y direction, and the positioning pin 19 and the width direction tension pin 14 are restricted in the degree of freedom in the X direction, the tension is applied to the chuck mechanism 15 in a state where tension is applied. The positioning of the flat aperture grill 1 is maintained.

The flat aperture grill 1 is structured to be pulled in both the X and Y directions, so that when the aperture grill frame 2 described later is pushed up, the positioning holes 5 of the flat aperture grill 1, the Y-direction pull holes 13, and the chuck Unnecessary wrinkles and scratches are prevented from being generated in the vicinity of the cut portion, and the displacement of the flat aperture grill 1 and the aperture grill frame 2 is prevented.

Next, as shown in FIG. 12, the aperture grille frame 2 is pushed up by a pressing mechanism (not shown). In this state, after welding near the apex, the aperture grille frame 2 is further pushed up until the curved surface of the aperture grille frame 2 and the flat aperture grille 1 are completely adhered. At this time, the positioning pin 19
And the width direction tension pin 14 prevents free rise of the flat aperture grill 1 by friction with the positioning hole 5 and the width direction tension hole 13. Since the catch due to the friction is not uniform in all the pins, the flat aperture grill 1 is distorted. Thereafter, as the aperture grill frame 2 is raised, the aperture grill frame 2 and the flat aperture grill 1 are connected to the welding device 10 over the entire length of the frame.
By welding.

After the welding is completed, the eccentric roller 17 and the concentric roller 18 rotate when the chuck mechanism 15 approaches each other in the X direction, and the grip of the grill is released. Also,
By cutting the periphery of the flat aperture grill 1 along the cutting slit 6 and the perforation 7, the assembly of the aperture grill 100 is completed.

The welding method for welding the flat aperture grille 1 by pushing up the aperture grille frame 2 includes a method for welding from one end to the other end of the curved frame 3 at one time, and a method for welding from an intermediate position (also referred to as a welding division position). There are two types of distributed welding: starting welding, welding to one end, and then welding again from the middle point to the opposite end. Distributive welding has advantages such as a longer cycle time but less variation in the last slit width.

[0015]

The conventional apparatus and method for assembling an aperture grille are constructed as described above. Therefore, when a flat aperture grill is supplied and placed on a plate, the flat aperture grill is assembled. There was a problem that the end portion jumped up, the height of the flat aperture grill had a large variation, and the insertion of the chuck mechanism into the gap between the eccentric roller and the concentric roller became uncertain, which caused a clamping error. Further, when the aperture grill frame is pushed up, there is a problem in that the flat aperture grill is caught by the tension pin due to friction between the flat aperture grill and the tension pin, resulting in displacement and twisting.

Further, when performing distributed welding, if an excessive current flows at the welding division position or there is a slight shift between the two electrode pressing positions, there is a problem that wrinkles and pitch unevenness occur. Was.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an assembling apparatus for an aperture grill which reliably assembles a flat aperture grill and an aperture grill frame to prevent wrinkles and strut defects. And an assembling method.

[0018]

An apparatus for assembling an aperture grill according to the present invention comprises a rectangular thin metal plate, and has at least one pair of positioning holes at its widthwise edge and at least two holes.
An aperture grill assembling apparatus for assembling an aperture grill by welding a flat aperture grill having a pair of width direction tension holes to a curved frame of an aperture grill frame, comprising: suction means for absorbing the flat aperture grill. A grill set plate for sucking the flat aperture grill to determine the set height thereof, and at least one pair of first plates engaged with the positioning holes to determine a longitudinal position of the flat aperture grill and apply a tension in the width direction. A pin, and at least two pairs of second pins that are engaged with the width direction tension holes to apply width direction tension to the flat aperture grille;
A mechanism for pressing the curved frame against the flat aperture grill; and welding means for welding the flat aperture grill to the aperture grill frame.

In addition, at least one of the first pin and the second pin has a sliding means whose position can be freely raised as the flat aperture grill is raised.

The sliding means may be a first pin or the second pin.
And a linear motion bearing.

Further, in the method of assembling the aperture grill according to the present invention, after the welding device is pressed near the center of the edge in the width direction of the flat aperture grill, the welding device is connected to the center of the edge without passing a welding current. A process of starting the welding from an arbitrary welding start position while running in the direction of the free running and welding to one end of the width direction edge, and performing the welding up to just before the starting position. After running and returning, a step of idling the welding device toward the welding start position, starting welding from the welding start position while running in the direction of the idling to the other end of the width direction edge. Welding step.

[0022]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 FIG. 1 shows an aperture grille assembling apparatus (also referred to as a mask setting section) according to Embodiment 1 of the present invention. In the following drawings, the same reference numerals as those in the description of the conventional example denote the same or corresponding parts, and a detailed description thereof will be omitted.

Reference numeral 23 denotes a grill set plate for determining the set height by sucking the flat aperture grill 1 by suction means, and 24 is inserted into the positioning hole 5 of the flat aperture grill 1 to position the flat aperture grill 1 in the X direction. And 25 is a first pin for applying tension in the Y direction, and 25 is a width direction tension hole 13.
And a second pin for applying tension in the Y direction. The first pin 24 and the second pin 25 are both
A structure (referred to as sliding means) that is held by the linear motion bearing 28 and that can slide freely in the Z direction while moving in the Y direction for generating tension. Reference numeral 26 denotes a through hole provided in the grill set plate 23, which communicates with a vacuum suction device described later.

FIG. 2 is a view showing a process in which the flat aperture grill 1 is set on the grill set plate 23, then is gripped by the chuck mechanism 15, and tension is applied in the X direction. First, in FIG. 2A, the flat aperture grill 1 is placed on the grill set plate 3. The through-hole 26 of the grill set plate 23 is connected to a suction device (suction means) such as a convum, and the end of the flat aperture grill 1 is turned up by sucking the end of the flat aperture grill 1 as shown in FIG. Prevent climbing and position accurately. At the same time, the chuck mechanisms 15 approach each other and grip the flat aperture grill 1. Then, as shown in FIG. 2C, the chuck mechanism 15 retreats and a tensile force is applied in the X direction.

FIG. 3A shows a state in which the tension in the X direction is applied as shown in FIG. 2C as viewed from the X direction. Thereafter, as shown in FIG. 3B, the aperture grill frame 2 is pushed up by a pressing mechanism (not shown),
FIG. 3 shows a state in which the flat aperture grill 1 is in close contact with the aperture grill frame 2. The first pin 24 and the second pin 25 are freely held up and down by a linear motion bearing 28, and their own weight is almost supported by the compression spring 9, so that they are in a floating state, and the aperture grill frame 2 is When pushed up, each of the first pin 24 and the second pin 25 is passively raised by friction with the hole of the flat aperture grille 1. As a result, unnecessary stress is not applied to the flat aperture grill 1.

After the flat aperture grill 1 is completely adhered to the aperture grill frame 2, the welding electrode 10
Welded. When the aperture grille is assembled and removed, the first pin 24 and the second pin 25 are returned to the original vertical position by the compression spring 9.

The method of pushing up the aperture grille frame 2 is as follows. When the flat aperture grille 1 comes into contact with the curved frame 3 once, the contact is welded only. Weld the rest after contact. The first pin 24 and the second pin 25 move up together with the flat aperture grill 1 every time this pushing is performed.

The first pin 24 and the second pin 25
Has been described as being supported by the compression spring 9, but its own weight may be supported by air pressure, hydraulic pressure, electromagnetic force, or the like. The linear motion bearing 28 may be replaced with a low friction material such as Teflon as long as it is a means for reducing the friction at that portion.

Embodiment 2 4 and 5 are views showing a welding process of the flat aperture grill 1 and the aperture grill frame 2 according to the present invention. FIG. 4 shows the first half of the welding process, and FIG. 5 shows the second half of the welding process.

In the drawing, reference numeral 40 denotes a welding division position (also referred to as a welding start position) of distributed welding, and reference numeral 41 denotes a position where the welder 10 is first pressed before the first half of the welding starts. Reference numeral 42 denotes an idle running section in which the welding device 10 (welding means) idles without passing a welding current.

When the welding is started from the vicinity of the center of the aperture grille frame 2 as distribution welding, FIG.
In the above, after the welding electrode 10 is pressed to the pressing position 41, the welding electrode 10 is caused to run idle without flowing a current for a certain section or for a certain period of time, and starts welding after reaching the welding start position 40. After the welding of one side (the first half) is completed, the welding of the other part is performed by lowering the welding electrode to a position (a range where welding has already been performed) before the position 40 where welding has been started earlier in FIG. Similarly, the vehicle is run idle, and begins to flow current from a position where it has not been welded before, and the whole is welded. During the idle running of the welder 10, stress and distortion due to friction between the flat aperture grill 1 and the curved frame 3 are removed, and welding without distortion can be performed.

FIG. 6 is a flowchart showing an assembling method according to the second embodiment to assist understanding of this step. In (ST1) of FIG. 6, the welder 10 is pressed near the center of the width direction edge of the flat aperture grill 1. In (ST2), the welding device 10 is caused to run idle for a certain time or a certain distance. In (ST3), an arbitrary welding start position 4
Welding starts from 0 and welds to the end in the width direction. (S
At T4), the vehicle travels backward to the position before the welding start position 40, returns, and runs idle toward the welding start position 40. (ST5)
Then, welding is started from the welding start position 40 toward the other end.

[0033]

In the apparatus for assembling an aperture grill according to the present invention, since the end of the flat aperture grill is sucked and fixed by the suction device provided on the set plate, the set position of the end of the flat aperture grill is accurately determined. In addition, the flat aperture grill can be reliably held by the chuck mechanism.

Further, since the first pin and the second pin rise freely with the rise of the flat aperture grill, no stress is applied from the second pin when pushing up by the aperture grill frame, and the flat aperture is not affected. Since no stress is applied to the grill, the occurrence of the last slit defect can be reduced.

Further, since the first focus and the second pin constitute a floating state by the structure of the linear motion bearing and the compression spring, the effect can be obtained with a simple structure.

Further, according to the method of assembling the aperture grill of the present invention, since welding is performed after the welding means is run for a predetermined time or in a predetermined section, wrinkles and unevenness at the welding start point can be prevented. .

[Brief description of the drawings]

FIG. 1 is a schematic view of an apparatus for assembling an aperture grill according to the present invention.

FIG. 2 is an explanatory view of an operation in which the assembling apparatus of FIG. 1 sucks a flat aperture grill.

FIG. 3 is an explanatory view of an operation in which a curved frame of the assembling apparatus in FIG. 1 pushes up a flat aperture grill.

FIG. 4 is an explanatory diagram of a first half of a method of assembling an aperture grill according to a second embodiment.

FIG. 5 is an explanatory diagram of the latter half of the method for assembling the aperture grille according to the second embodiment.

FIG. 6 is a flowchart of a method of assembling an aperture grille according to a second embodiment.

FIG. 7 is a configuration diagram of an aperture grill.

FIG. 8 is a configuration diagram of a flat aperture grill.

FIG. 9 is a configuration diagram of a conventional aperture grill assembly apparatus.

FIG. 10 is a view for explaining the operation of the assembling apparatus of FIG. 9;

FIG. 11 is a configuration diagram of a chuck mechanism of the assembling apparatus of FIG. 9;

FIG. 12 is an explanatory view of an operation in which the aperture grill frame pushes up the flat aperture grill in the assembling apparatus of FIG. 9;

[Explanation of symbols]

1 flat aperture grille, 2 aperture grille frame, 3 curved frame, 4 connecting frame,
5 positioning hole, 9 compression spring, 10 welder, 13 width direction tension hole, 14 width direction tension pin, 15 chuck mechanism, 19 positioning pin,
23 grill set plate, 24 first pin,
25 second pin, 26 through-hole (adsorption means), 2
8 linear motion bearing (sliding means), 40 welding division position (welding start position), 99 base, 100 aperture grill

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Shoichiro Hara 2-3-2 Marunouchi, Chiyoda-ku, Tokyo F-term (reference) 5C027 HH23 in Mitsubishi Electric Corporation

Claims (4)

[Claims] 1. A flat aperture grill made of a rectangular thin metal plate and having at least one pair of positioning holes and at least two pairs of width direction tension holes at widthwise edges is welded to a curved frame of the aperture grille frame. An assembling device for assembling the aperture grille, comprising a suction set for sucking the flat aperture grille, a grill set plate for sucking the flat aperture grille and determining a set height thereof, and a positioning set hole. At least a pair of first pins that are combined to determine a longitudinal position of the flat aperture grill and apply a tension in the width direction, and are engaged with the tension holes in the width direction to apply a tension in the width direction to the flat aperture grill. At least two pairs of second pins and the curved frame An assembly device for an aperture grill, comprising: a mechanism for pressing the flat aperture grill on the aperture grill; and welding means for welding the flat aperture grill to the aperture grill frame. 2. The aperture according to claim 1, wherein any one of the first pin and the second pin includes a sliding means whose position is freely raised as the flat aperture grill is raised. Grill assembly equipment. 3. The sliding means according to claim 1, wherein said sliding means comprises said first pin or said second pin.
The assembly device for an aperture grill according to claim 2, further comprising a compression spring loaded on the pin and a linear motion bearing. 4. After the welding means according to claim 1 is pressed near the center of the widthwise edge of the flat aperture grill, the welding device is emptied toward the center of the edge without passing a welding current. A step of running, starting welding from an arbitrary welding start position while running in the direction of the idle running, welding to one end of the width direction edge, and running backward and returning to just before the start position. After that, a step of idling the welding device toward the welding start position, and a step of starting welding from the welding start position while running in the direction of the idling and welding to the other end of the width direction edge. A method of assembling an aperture grill, comprising: