JP3494358B2 - Method and apparatus for assembling aperture grill - Google Patents

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art Inside a color picture tube, a grid-shaped aperture grill is used as an electrode for selecting an electron flow emitted from an electron gun for each color. While the aperture grill is extremely precise and precise, it is a large component whose size is almost equal to the screen size of a color picture tube, so it is easy to distort during assembly, and various conventional It has been devised.

A conventional assembling method of the aperture grill and its assembling apparatus will be described below with reference to FIGS.
FIG. 7 shows a shape before assembly of an aperture grille 100 similar to that disclosed in Japanese Patent Application No. 9-358129 filed by the present applicant. For convenience of description below, as shown in FIG. 7, a long aperture grill 100 including 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 the figure, 3 is a bending frame for giving a required curved surface to the flat aperture grill 1, and 4 is a connecting frame for connecting the two bending frames 3.
The bending frame 3 and the connecting frame 4 are integrally welded as shown in the figure to form the aperture grill frame 2.

FIG. 8 shows details of the flat aperture grill 1. The flat aperture grill 1 has at least one set of positioning holes 5 and a long axis in the X direction at the center of the edge in the X direction (edge in the width direction) in addition to the central grid portion (also referred to as the last slit). At least 2 to 4 elliptical width direction pull holes 13 are machined. The slits 6 and the 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 grille 100 disclosed in the above-mentioned application. To assemble the aperture grill 100, first, the curved frame 3 is placed on the base 99 with the curved surface facing upward and positioned. After that, the bending frame 3 is pressed by a pressing block (not shown) from the side direction (the arrow indicated as pressing in the drawing), and the bending frames 3 are deformed so as to approach each other within the elastic deformation range. At this time, the connecting frames 4 are distorted in the direction away from each other.

Next, as shown in FIG. 10, while keeping the flat aperture grill 1 horizontal, the positioning pin 19 and the width direction pulling pin 14 are inserted into the positioning holes 5 and the width direction pulling hole 13. 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 tension in the Y direction (width direction) to the flat aperture grill 1.

Next, the four corners of the flat aperture grill 1 are provided with an eccentric roller 17 and a concentric roller 1 as shown in FIG.
Two sets of four and four chuck mechanisms 15 are gripped. Then, as shown in FIG. 12, two chuck mechanisms 15 facing each other in the X direction are connected by an air cylinder 98 in a state of being floated from a base 99, and these are placed on a guide 97 which can freely move in the X direction. Is separated from the base 99 and the pulling force of the air cylinder 98 acts as an internal force. As a result, tension is applied to the flat aperture grill 1 in the X direction only as an internal force, and no unnecessary force is applied between the flat aperture grill 1 and the outside (for example, the base 99). Therefore, displacement in the length direction (X direction) is prevented. You can

The chuck mechanisms 15 on both sides of the flat aperture grill 1 approach each other in the X direction, and the eccentric roller 1
Flat aperture grill 1 between 7 and concentric roller 18
When sandwiched, the eccentric roller 17 is rotated to grip the flat aperture grill 1. Concentric roller 18
Since the stopper cannot rotate in the direction in which the flat aperture grill 1 comes off, gripping is completed.

After the gripping by the chuck mechanism 15 is completed, the chuck mechanisms 15 move in directions opposite to each other in the X direction and generate tension in the flat aperture grill 1 in the X direction. Since the chuck mechanism 15 can apply uniform tension over the entire length of the grip portion, wrinkles and scratches do not occur on the flat aperture grill 1. After that, the pressures of the positioning pin 19 and the width direction pulling pin 14 air cylinder (not shown) are equalized on both sides to cancel the positioning reference. However, since the chuck mechanism 15 is constrained in the degree of freedom in the Y direction, and the positioning pin 19 and the width direction pulling pin 14 are constrained in the degree of freedom in the X direction, the state in which tension is applied remains unchanged. The positioning of the flat aperture grill 1 is maintained.

With the structure in which the flat aperture grill 1 is pulled in both the XY directions, the positioning hole 5 of the flat aperture grill 1, the Y direction pulling hole 13, and the chuck are pushed when the aperture grill frame 2 to be described later is pushed up. Useful wrinkles and scratches are prevented from being generated in the vicinity of the opened portion, and the flat aperture grill 1 and the aperture grill frame 2 are prevented from being displaced from each other.

Next, as shown in FIG. 12, the aperture grill frame 2 is pushed up by a mechanism (not shown) such as a pressing device. In this state, after welding in the vicinity of 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 in close contact with each other. At this time, the positioning pin 19
The widthwise pulling pin 14 prevents the flat aperture grill 1 from freely rising due to friction between the positioning hole 5 and the widthwise pulling hole 13. The catch due to this friction cannot be said to be uniform in all the pins, so that the flat aperture grill 1 is distorted. Then, as the aperture grille frame 2 rises, the aperture grille frame 2 and the flat aperture grille 1 are then welded over the entire length of the frame by the welding device 10.
Weld by.

After the welding is completed, the chuck mechanisms 15 approach each other in the X direction, whereby the eccentric roller 17 and the concentric roller 18 rotate to release the grip of the grill. Also,
The assembling of the aperture grille 100 is completed by cutting out the periphery of the flat aperture grill 1 along the cut slit 6 and the perforations 7.

The welding method for pushing up the aperture grille frame 2 and welding the flat aperture grille 1 is to weld the curved frame 3 from one end to the other end at once, or from an intermediate position (also referred to as a welding division position). There are two types of distribution welding, in which welding is started, welding is performed up to one end, and then welding is performed again from the intermediate point to the opposite end. The distribution welding has a long cycle time, but has an advantage that variations in the last slit width are reduced.

[0015]

Since the conventional apparatus and method for assembling the aperture grille are configured as described above, when the flat aperture grille is supplied and placed on the plate, the flat aperture grille's There is a problem in that the end portion jumps up, the height of the flat aperture grill varies greatly, the insertion into the gap between the eccentric roller and the concentric roller of the chuck mechanism becomes uncertain, and a clamping error occurs. Further, when pushing up the aperture grille frame, there is a problem that the flat aperture grille is caught in the pulling pin due to the friction between the flat aperture grille and the pulling pin, causing a displacement and a twist.

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

The present invention has been made to solve the above problems, and an assembling apparatus for an aperture grill for surely assembling a flat aperture grill and an aperture grill frame to prevent wrinkles and strut defects from occurring. And an assembling method.

[0018]

SUMMARY OF THE INVENTION An aperture grill assembling apparatus according to the present invention comprises a rectangular thin metal plate and at least one pair of positioning holes at its widthwise edges, and at least two.
A flat aperture grill having a pair of width direction pulling holes, an aperture grill assembling device for assembling an aperture grill by welding to a curved frame of an aperture grill frame, the device having suction means for sucking the flat aperture grill. A grill set plate for adsorbing the flat aperture grill to determine its set height, and at least a pair of first engaging with the positioning holes for determining the longitudinal position of the flat aperture grill and applying tension in the width direction. Pins and at least two pairs of second pins engaged in the widthwise pull holes to apply widthwise 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 are provided.

Further, at least one of the first pin and the second pin is provided with a sliding means whose position freely rises as the flat aperture grill rises.

The sliding means may be the first pin or the second pin.
This is due to the compression spring loaded on the pin and the linear motion bearing.

In addition, an aperture grill assembling method according to the present invention uses the aperture grill assembling apparatus.
Te, after pressing the welding means in the vicinity of the center of the widthwise end edges of the flat aperture grille, a step of causing run empty towards the welding device in the middle of the edges not flush the welding current, the air A step of starting welding from any welding start position while running in the running direction and welding up to one end of the widthwise end edge, and returning the welding backward to the position before the start position and then returning the welding device It includes a step of idling toward the welding start position, and a step of starting welding from the welding start position and running to the other end of the width direction edge while running in the idling direction.

[0022]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiment 1. FIG. 1 shows an aperture grill assembly apparatus (also referred to as a mask setting section) according to Embodiment 1 of the present invention. In each of the following drawings, the same reference numerals as those in the drawings for explaining the conventional example indicate the same or corresponding portions, and thus detailed description thereof will be omitted.

Reference numeral 23 denotes a grill set plate for sucking the flat aperture grill 1 by suction means to determine the set height, 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 the first pin for applying tension in the Y direction, and 25 is the width direction pull hole 13
Is a second pin for inserting tension in the Y direction. Both the first pin 24 and the second pin 25 are
It has a structure (referred to as a sliding means) that is held by a linear motion bearing 28 and can freely slide 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 diagram showing a process in which the flat aperture grill 1 is set on the grill set plate 23, then 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. A suction device (suction means) such as a convum is connected to the through hole 26 of the grill set plate 23. By sucking the end of the flat aperture grill 1 as shown in FIG. Prevents rising and positions accurately. At the same time, the chuck mechanisms 15 approach each other to grip the flat aperture grill 1. Then, as shown in FIG. 2C, the chuck mechanism 15 retracts and a tensile force is applied in the X direction.

FIG. 3A shows a state in which a 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 grille 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 vertically held by the linear motion bearing 28, and their own weight is almost supported by the compression spring 9. Therefore, the first pin 24 and the second pin 25 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 passively rises due to friction with the hole of the flat aperture grill 1. This prevents unnecessary stress from being applied to the flat aperture grill 1.

After the flat aperture grill 1 is completely attached to the aperture grill frame 2, the welding electrode 10
Welded by. When the aperture grill is assembled and removed, the first pin 24 and the second pin 25 return to their original up and down position by the compression spring 9.

The method of pushing up the aperture grille frame 2 is as follows. When the flattened aperture grille 1 is pushed up once and the flat aperture grille 1 comes into contact with the curved frame 3, only its contact points are welded, and then the aperture grille frame 2 is pushed up again, and the entire length of the curved frame 3 is pushed up. Weld the rest after the contact. The first pin 24 and the second pin 25 ascend together with the flat aperture grill 1 each time the thrust is pushed up.

Incidentally, the first pin 24 and the second pin 25
It has been described that is supported by the compression spring 9, but its own weight may be supported by pneumatic 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 the 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 figure, reference numeral 40 indicates a welding division position (also referred to as welding start position) of distribution welding, and 41 indicates a position at which the welder 10 is first pressed before the start of welding in the first half. Reference numeral 42 denotes an idle running section in which the welder 10 (welding means) is run idle without passing a welding current.

In the case of starting the welding from the vicinity of the center of the aperture grille frame 2 as distributed welding as shown in FIG.
At this point, after the welding electrode 10 is pressed by the pressing position 41, the welding electrode 10 is idled for a certain period of time or for a certain period of time without flowing an electric current, and welding is started after reaching the welding start position 40. After the welding on the one side (first half) is completed, the welding on the other part is performed by lowering the welding electrode before the position 40 where welding is started earlier in FIG. 5 (the range where welding is already performed). In the same manner, let it run idle and start passing an electric current from the point where it entered the area where welding was not done first, and weld the whole. While the welder 10 is idle, the stress and strain due to the friction between the flat aperture grill 1 and the curved frame 3 can be removed and welding can be performed without strain.

In order to help understanding of this process, FIG. 6 shows a flowchart of the assembling method according to the second embodiment. In (ST1) of FIG. 6, the welder 10 is pressed near the center of the widthwise end edge of the flat aperture grill 1. In (ST2), the welder 10 is idled for a fixed time or a fixed distance. At (ST3), arbitrary welding start position 4
Welding starts from 0 and welds to the end in the width direction. (S
At T4), the vehicle runs backward to the position before the welding start position 40 and 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]

According to the aperture grill assembling apparatus of the present invention, since the end portion of the flat aperture grill is sucked and fixed by the suction device provided on the set plate, the set position of the flat aperture grill end portion is accurately determined. The gripping of the flat aperture grill by the chuck mechanism can be reliably performed.

Further, since the first pin and the second pin freely move up with the rise of the flat aperture grille, when pushing up by the aperture grille frame, stress is not applied to the second pin and the flat aperture is prevented. Since it does not stress the grill, the occurrence of defective last slits can be reduced.

Further, since the first pin and the second pin are in 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 the welding means is idle for a fixed time or a fixed section, the welding is carried out, so that wrinkles and unevenness of the welding start point can be prevented. .

[Brief description of drawings]

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

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

FIG. 3 is an explanatory view of the operation of the bending frame of the assembly device of FIG. 1 pushing up the flat aperture grille.

FIG. 4 is an explanatory diagram of the first half of the method for assembling the aperture grille according to the 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 for assembling the aperture grille according to the 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 device.

10 is a diagram illustrating the operation of the assembling apparatus in FIG.

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

12 is an explanatory view of the operation of the aperture grill frame pushing up the flat aperture grill in the assembly device of FIG. 9. FIG.

[Explanation of symbols]

1 flat aperture grille, 2 aperture grille frame, 3 curved frame, 4 connecting frame,
5 Positioning Holes, 9 Compression Springs, 10 Welders, 13 Width Direction Tension Holes, 14 Width Direction Tension Pins, 15 Chuck Mechanism, 19 Positioning Pins,
23 grill set plate, 24 first pin,
25 second pin, 26 through hole (suction means), 2
8 linear motion bearings (sliding means), 40 welding split positions (welding start position), 99 base, 100 aperture grille

─────────────────────────────────────────────────── --- Continuation of the front page (56) References JP-A-62-132832 (JP, A) JP-A-8-167376 (JP, A) JP-A-8-124480 (JP, A) JP-A-7- 211229 (JP, A) (58) Fields surveyed (Int.Cl. ⁷ , DB name) H01J 9/14

Claims (4)

(57) [Claims] 1. A flat aperture grill, which is made of a rectangular thin metal plate and has at least one pair of positioning holes at its widthwise edges and at least two pairs of widthwise pulling holes, is welded to a curved frame of an aperture grille frame. An apparatus for assembling an aperture grill for assembling an aperture grill, comprising: a grill set plate having suction means for sucking the flat aperture grill to suck the flat aperture grill to determine a set height thereof; At least one pair of first pins that are fitted together to determine the longitudinal position of the flat aperture grill and apply tension in the width direction, and engage the width pull holes to apply tension in the width direction to the flat aperture grill. At least two pairs of second pins and the curved frame are An apparatus for assembling an aperture grill, comprising: a mechanism for pressing the aperture grille; and a 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 is provided with a sliding means whose position freely rises as the flat aperture grill rises. Grill assembly device. 3. The sliding means is the first pin or the second pin.
The apparatus for assembling an aperture grill according to claim 2, further comprising a compression spring loaded on the pin and a linear motion bearing. 4. A set of aperture grilles according to claim 1.
A method of assembling an aperture grill using a standing device, comprising:
After pressing the welding means in the vicinity of the center of the widthwise end edges of the flat aperture grille, a step of causing run empty towards the welding device in the middle of the edges not flush the welding current, No run this empty After starting the welding from any welding start position while running in the direction and welding to one end of the width direction edge, after returning to the front of the welding position by running backward,
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 idling direction and welding to the other end of the width direction edge A method for assembling the aperture grill, which is characterized by: