KR100236409B1 - Shadow mask mounting device - Google Patents

Abstract

1. TECHNICAL FIELD OF THE INVENTION

In the manufacturing process of a color CRT, it is a device which attaches a shadow mask to the panel of CRT.

2. The technical problem to be solved by the invention

It provides a shadow mast mounting apparatus that can improve the work efficiency by shortening the cycle time of the carry-in and out to the shadow mask attachment position of the panel panel panel corners are formed.

3. Summary of Solution to Invention

A pair of conveyors (7, 7) arranged in parallel on both sides of the attachment position to attach the shadow mask to the faner, and the panel between the two conveyors over the upper position and the attachment position beyond the conveying surface of the pair of conveyors. Panel lifting mechanisms 10A and 10B for lifting and lowering, and a positioning unit J for positioning the panel and the shadow mask disposed in correspondence with the corner portions of the panel and the shadow mask, respectively, and the panel includes both conveyors. When moving up and down (7,7), each conveyor (7,7) has a structure which retracts to both outer sides.

4. Important uses of the invention

It is used in the manufacturing process of color CRT.

Description

Shadow Mask Mounting Device

TECHNICAL FIELD This invention relates to the apparatus which attaches a shadow mask to the panel of a CRT in the manufacturing process of a CRT.

Conventionally, in the manufacturing process of the color CRT, a shadow mask in the form of a mesh is mounted inside the panel of the CRT to apply three primary colors of photosensitive paint by one color, and a shadow mask is mounted on the panel for each color to be applied.

In the shadow mask mounting operation, for example, a shadow mask mounting apparatus as described in Japanese Patent Application Laid-Open No. 4-77411 is used. In this apparatus, as shown in FIG. Panel P by protruding the panel pins P 'each protruding from the inner side of the four sides into the hole of the panel pins of the elastic pieces M' formed on the outside of the four sides of the shadow mask M, respectively. The shadow mask M is positioned and mounted at a predetermined position within the dot).

In the apparatus, panels without a shadow mask are conveyed by a pair of roller conveyors to just above the shadow mask attachment position, and then their roller conveyors are lowered to bring the panel on the roller conveyor to the panel centering support at the panel attachment position. After moving up and positioning by the positioning unit, the shadow mask which has been supplied and positioned before is attached to the bottom of the panel. The panel having the shadow mask mounted thereon is moved from the panel centering support to the roller conveyor by the pair of roller conveyors to be lifted out of the apparatus.

In recent years, color CRTs are being enlarged in accordance with high-definition such as hi-vision, and in order to cope with them in the CRT manufacturing process, panel pins are installed at corners of the inner surface of the panel, and corners of the shadow mask outer surface facing the panel pins are provided. The elastic piece is arranged in the part.

However, in a panel provided with panel pins at the corners, when attaching the shadow mask to the panel, it is necessary to install a positioning unit for positioning the panel and the shadow mask to each other in a diagonal direction outside the four corners of the panel. In this case, the roller conveyor and the positioning unit interfere with each other in the structure of lifting and lowering the roller conveyor as described in Japanese Patent Application Laid-Open No. 7-77411.

On the other hand, as a device for attaching a shadow mask to a panel provided with panel pins at the corners, as described in Japanese Patent Application Laid-Open No. 4-209439, the panel and the shadow mask are moved from above by a ceiling conveying device. After bringing it into the shadow mask mounting device, and attaching the shadow mask to the panel, the ceiling conveying device allows the shadow mask-mounted panel to be taken out of the shadow mask mounting device again by the ceiling conveying device. Since the vacuum suction pad for gripping and conveying is used, the conveying speed cannot be increased due to problems such as the fluctuation of the panel hanging, and the time required for the vacuum suction pad to be vacuumed when the panel is sucked and held. Therefore, there was a problem that the cycle time became long.

Therefore, the present invention solves the problems of the prior art as described above, and provides a shadow mask mounting apparatus that can improve the work efficiency by reducing the cycle time of import and export to the shadow mask attachment position of the panel with the corner panel pin is installed. Main purpose is to provide.

1 is a plan view showing an embodiment of a shadow mask mounting apparatus of the present invention,

2 is a sectional view seen from the arrow direction at the position A-A of FIG. 1,

3 is a cross-sectional view showing the structure of the roller conveyor,

4 is a side view of the panel lifting mechanism,

5 is a plan view of the panel lifting mechanism,

6 is a sectional view seen from the arrow direction at the position B-B in FIG. 1,

7 is a diagram illustrating an example of a connection structure between a conventional panel and a shadow mask.

* Explanation of symbols for main parts of the drawings

1: shadow mask mounting device 2: body frame

3: slide frame 4: linear guide

5: Ball screw 6: Linear guide

7: Roller Conveyor 7A: Roller Support Frame

7B: Roller shaft 7C: Carrying roller

7D: Sprocket 7E: Chain

8: Conveyor Frame 9: Cylinder Device

10A, 10B: Panel lifting mechanism 11: Ball screw

12A, 12B: Linear Guide 13A, 13B: Moving Frame

14A, 14B: Linear Guide 15A, 15B: Cylinder Device

16A, 16B: Platform 17A, 17B: Panel support

S: Stopper surface G: Panel oil surface

18 lifting rod 19: mask holding area

21: mask holder 22: movable frame

25: pressing projection body 26: positioning projection body

27: movable table 28: linear guide

29 cylinder device 30 centering pin

31: rotating arm 32: cylinder device

33: mask holder J, K: positioning unit

For this purpose, the shadow mask mounting apparatus of the present invention firstly attaches the shadow mask to the panel by engaging the elastic pieces attached to the outside of the corner portions of the shadow mask to the panel pins protruding inside the corner portions of the CRT panels. A shadow mask mounting apparatus having a mechanism, comprising: a pair of conveyors arranged in parallel on both sides of an attachment position for attaching a shadow mask to a panel, an upper position beyond the carrying surface of the pair of conveyors, and the attachment position And a positioning unit for positioning the panel and the shadow mask disposed around the attachment position corresponding to corner portions of the panel and the shadow mask, respectively, for lifting the panel between the two conveyors. Conveyors support the lower edges of the two opposite sides of the panel from both sides. Over a transport approach each other to allow the transport position, the lift panel to the support panel in the sphere passing through the up and down away from the retracted position to the both outer sides are free to advance and retreat the configuration.

Second, the shadow mask mounting apparatus of the present invention, by fitting the elastic mask attached to the outside of the corner portion of the shadow mask to the panel pin protruding inside the corner portion of the panel of the CRT and the mechanism of attaching the shadow mask to the panel A shadow mask mounting apparatus having a mechanism for attaching a shadow mask to a panel by engaging an elastic piece attached to the outside of the four sides of a shadow mask with a panel pin protruding from the inside of the four sides, and attaching the shadow mask to the panel. A pair of conveyors arranged in parallel on both sides of the attachment position, a panel elevating mechanism for lifting the panel up and down between the conveyors over the attachment position and the attachment position beyond the conveying surface of the pair of conveyors, the panel and the shadow mask Disposed around the attachment position corresponding to the corner portion and the center of the four sides of And a positioning unit for positioning the panel and the shadow mask, wherein the pair of conveyors have a conveying position approaching each other so that the lower edges of the two sides facing the panel can be supported and conveyed from both sides, and the panel lift Advancing and retreating are comprised freely over the retracted position separated to both sides so that the panel supported by the sphere can pass up and down between them.

In each of the shadow mask mounting apparatuses, the pair of conveyors have a conveying position approaching each other so as to support and transport the lower edge portions of two opposite sides of the panel on both sides, and the panel supported by the panel lifting mechanism is between. Is supported on each of the pair of slide frames to freely move forward and backward across the retracted positions spaced apart from each other so as to pass up and down, and the pair of slide frames face each other in the same direction as the opposite direction of the pair of conveyors. It is preferable that the opposing interval is comprised so that adjustment is possible.

The panel on which the shadow mask is mounted is supported by the lower edge portions of two sides facing the pair of conveyors, respectively, and is brought in above the shadow mask attachment position. Subsequently, the panel lifting mechanism is raised to lift the panel from the conveying surface of the pair of conveyors, and both conveyors move to the retracted positions on both sides.

The panel passed from the pair of conveyors to the panel elevating mechanism passes downwards between the pair of conveyors with opposing gaps on both sides and moves to the shadow mask attaching position, where it is positioned by the positioning unit, and the shadow mask is attached in advance. A shadow mask supplied below the position and positioned by the positioning unit is loaded into the shadow mask at the bottom of the panel.

The panel equipped with the shadow mask is lifted up to the upper position beyond the conveying surface of the pair of conveyors by the panel elevating mechanism, and then the opposing intervals of both conveyors are moved to the conveying position. The panel lifting mechanism is then lowered to lower the panel equipped with the shadow mask on both conveyors, and the panel is supported by a pair of conveyors and taken out from the shadow mask mounting apparatus.

EXAMPLE

EMBODIMENT OF THE INVENTION Below, one Example of this invention is described based on drawing. FIG. 1 is a plan view showing one embodiment of the shadow mask mounting apparatus of the present invention, and FIG. 2 is a sectional view seen in the direction of an arrow at the position AA line of FIG. 1, wherein the shadow mask mounting apparatus 1 has a corner portion of a panel pin. The shadow mask mounting apparatus 1 can be attached to both the panel formed in the panel and the panel provided at the center of four sides.

As shown in FIG. 2, on the main frame 2 of the shadow mask mounting apparatus 1, a pair of slide frames 3 are respectively supported by the linear guide 4 in the opposite direction and freely slide the ball screw. The actuator using (5) can be moved symmetrically to change the opposing interval.

On each slide frame 3, the slide is freely provided with the conveyor frame 8 which supports the roller conveyor 7 via the linear guide 6. As shown in FIG.

The roller conveyors 7 and 7 are for carrying in the panel which is not equipped with the shadow mask, and for carrying out the panel after the shadow mask is mounted. As shown in FIG. 3, the slide frame 3 together with the conveyor frame 8 is shown. By the cylinder device 9 provided in the), it is possible to slide in the same direction as the slide frame 3, that is, the direction orthogonal to the conveying direction. The roller conveyors 7 and 7 each have a narrow roller support frame 7A fixed to the upper surface of the conveyor frame 8, and a plurality of roller shafts 7B are freely rotatable along the longitudinal direction thereof.

At the end of the roller shaft 7B of each of the opposing groups of the pair of roller conveyors 7 and 7, a conveying roller 7C having a collar portion for restricting the movement of the panel to be transported in the left and right directions is attached. At the same time, the sprocket 7D is attached to the outer end and between the sprockets 7D of the roller shaft 7B adjacent to the conveying direction of each roller conveyor 7, as shown in FIG. Similarly, the chain 7E for interlocking motion is wound. And when one of the roller shafts 7B is driven by the drive source which is not shown in figure, each conveyance roller 7C is comprised so that it may rotate simultaneously.

As shown in FIG. 1, panel elevating mechanisms 10A and 10B for exchanging panels between a pair of roller conveyors 7 and 7 are provided before and after the conveying direction of the roller conveyors 7 and 7, respectively. . As shown in FIG. 4, the front panel elevating mechanism 10A and the rear panel elevating mechanism 10B are connected to the main body via linear guides 12A and 12B to allow the ball screw 11 to approach and detach from each other. It is provided on the movable frames 13A and 13B supported on the frame 2, respectively.

As shown in FIG. 4 and FIG. 5, the panel lifting mechanisms 10A and 10B are each provided by linear guides 14A, 14A, 14B and 14B which are arranged on the left and right sides of the movable frames 13A and 13B, respectively. The slide is freely supported in the up and down direction, and has lifting platforms 16A and 16B which are driven up and down by the cylinder devices 15A and 15B, and a pair of left and right panel support holes at the upper ends of the respective lifting platforms 16A and 16B ( 17A, 17A, 17B, 17B) are attached.

In the pair of front panel support holes 17A and 17A, an inclined stopper surface S and a panel support surface G for stopping the panel conveyed on the roller conveyor 7 at a predetermined position are formed. Moreover, only the panel support surface G is formed in a pair of back panel support opening 17A, 17B. Although not shown, each of the panel support holes 17A and 17B is supported by the lifting tables 16A and 16B via a floating mechanism using coil springs, so that the impact when lifting the panel is alleviated. Moreover, the positioning unit K mentioned later is provided on the front and back movable frames 12A and 12B.

On the other hand, as shown in Figs. 1 and 2, the shadow mask is a mask support (attached to the upper end of each of the four lifting rods 18 which are driven up and down synchronously in the shadow mask mounting apparatus 1 ( 19) From above, it is to be carried in by the conveying apparatus or manpower which is not shown in figure. In addition, with respect to the shadow mask carried over the mask supporter 19, the mask centering mechanism 20 enters inward from the bottom, corrects the position of the shadow mask, and attaches it to the elastic piece attached to the outside of the shadow mask. The formed panel pin engaging hole is configured to be positioned so as to face a predetermined direction. As the mask centering mechanism 20, one having a structure disclosed in Japanese Patent Application Laid-Open No. 4-77411 is used.

As shown in FIG. 6, around the mask centering mechanism 20, the mask holder 21 which holds the elastic piece attached to the outer side of the corner part of a shadow mask from a diagonal direction is four corner parts of a shadow mask. Four sets are installed to correspond to each. The four sets of mask holders 21 are attached together with the mask centering mechanism 20 to an elevating frame 22 which is freely supported on the main frame 2 of the shadow mask mounting apparatus 1.

The mask holder 21 has a movable frame 24 which is driven back and forth in a diagonal direction by the cylinder device 23 on the lifting frame 22, and is formed in a corner portion outside the shadow mask on the movable frame 24. Positioning stones for positioning the panel by engaging the pressing projections 25 for pressing and holding the elastic pieces from the outside and the panel pins protruding into the panel when the shadow mask is mounted on the panel. The base 26 is provided.

At each of the outer positions of the four sets of mask holders 21 described above, the movable table 27 is supported on the main body frame 2 via the linear guide 28, and is moved forward and backward by the cylinder device 29. It is possible to move. On each movable table 27, a positioning unit J is provided.

The positioning unit (J) has a centering pin (30) which is free to go in and out in the same direction as the moving direction of the movable table (27), and the mask on the mask support (19) (see FIGS. 1 and 2). Panel pins are formed in the resilient pieces of the four corner portions of the shadow mask positioned at the centering mechanism 11 to engage the centering pins 30 from all directions so as to precisely position the shadow mask. have.

In addition, three of the four positioning units J provided on the movable table 27 are provided with a rotation arm 31 above the centering pin 30. The pivot arm 31 has a panel pin guide groove not shown at the front end, as disclosed in Japanese Unexamined Patent Publication No. 4-77411, and retracts outward from the centering pin 30. The cylinder device 32 is rotated at a position rotated downwardly and at a position rotated upwardly.

The front end portion of the pivot arm 31 is formed in a hook shape so as to face in a substantially vertical direction at a position rotated inwardly upwards, and the panel is pressed against the shadow mask to raise the above-mentioned panel lifting mechanisms 10A and 10B. In the state supported by the panel support holes 17A and 17B, the panel pin guide groove is engaged with the panel pin so that the panel is positioned at a predetermined position.

As shown in FIG. 1 and FIG. 2, the shadow mask of the form in which elastic pieces are respectively provided in the center part of four sides is hold | maintained in four directions front, back, left, and right around the mask centering mechanism 20 mentioned above. In order to do this, four sets of mask holders 33 having the same structure as the mask holder 21 described above are provided.

Further, the positioning units K having the same structure as the positioning unit J correspond to the outside of the four mask holders 33, respectively, on the left and right slide frames 3 and 3 shown in FIG. And mounted on the front and rear movable frames 13A and 13B shown in FIG.

Next, the operation of attaching the shadow mask to the panel where the panel pins are provided at the corners by the shadow mask mounting apparatus 1 described above will be described. The shadow mask is placed on the four mask supports 19 in the elevated position as shown in FIG. 2 by a conveying device such as an industrial robot or a lifter having a gripper, or by an attraction force.

Subsequently, these mask supporters 19 are lowered to the position of the mask centering mechanism 20, and the mask centering mechanism 20 is intruded from the lower side of the shadow mask to the inside thereof. Here, the mask centering mechanism 20 performs a centering operation, and preliminary positioning of the shadow mask is performed.

Further, after the movable table 27 shown in FIG. 6 is positioned in the diagonal direction in accordance with the size of the shadow mask, the centering pins 30 protrude toward the diagonal center side, respectively, to each elastic piece of the shadow mask. Precise positioning of the shadow mask is achieved by engaging the formed panel pin engaging holes.

Next, after adjusting the position of the movable frame 24 of the mask holder 21 by the cylinder apparatus 23 to a position suitable for the size of the shadow mask, the lifting frame 22 is raised at the position shown in FIG. The engagement recesses (not shown) formed at the upper ends of the positioning projections 26 are engaged with the centering pins 30 from below.

When the crimp protrusions 25 are pressed against the elastic pieces of the shadow mask at this position, the shadow mask is held by each crimp protrusions 25 of the four mask holders 21. The centering pin 30 retracts to the support position where the shadow mask is held in the mask holder 21.

On the other hand, the panel for mounting the shadow mask is carried into the center of the shadow mask mounting apparatus 1 by a pair of roller conveyors 7 and 7. The pair of roller conveyors 7 and 7 are carried into the center of the shadow mask mounting apparatus 1. The distance between the pair of roller conveyors 7 and 7 is adjusted by the ball screw 5 to adjust the position of the pair of slide frames 3 and 3 in advance so as to fit the panel size. The stopper surface S of the support opening 17A is in the position which protrudes above the conveyance surface between the said roller conveyors 7,7, and is front of the panel which moves forward on the roller conveyors 7,7. The end stops at a position in contact with the stopper surface.

Subsequently, the front and rear lifting platforms 16A and 16B are synchronously lifted by the cylinder devices 15A and 15B, and the respective panel support surfaces G of the front and rear left and right four panel supporters 17A, 17A, 17B, and 17B. It rises above this conveyance surface and lifts the lower surface of the panel from above the conveyors 7,7.

Next, the pair of roller conveyors 7 and 7 are moved to both outer sides by the cylinder apparatus 9 shown in FIG. 3, and the panel conveyors 7 and 7 are moved down by synchronizing with the platform 16A, 16B. ) To the bottom.

Subsequently, among the four sets of positioning units J shown in FIGS. 1 and 6, the rotation arm 31 disposed above the three centering pins 30 rotates upward from the cylinder device 32. Then, the panel pin guide grooves formed at the front end thereof are engaged with the panel pins protruding inside the corners of the panel to position the panels. After the positioning operation, the pivot arm 31 rotates downward again to return to the original position. In addition, the rotation arm 31 is not provided in all four positioning units J in order to avoid the mounting error of a panel pin, and only two rotation arms 31 oppose the diagonal direction of a panel. You may install it.

Next, when the lifting frame 22 is raised, the shadow mask is raised in the state held by the crimp protrusion 25 via the elastic piece, and the four panel support holes 17A, 17A, 17B, and 17B are raised. It penetrates from below the inside of the panel supported on the panel support surface (G), and the engaging recess of the upper end of the positioning protrusion engages with the panel pin of the panel so that the engaging hole of the elastic piece can correspond exactly. Is determined.

After the positioning is completed, when the pressing piece 25 is retracted outward to open the elastic piece, the elastic piece is deformed by its elasticity, and the panel pin is hooked to the panel pin hole to engage the panel. The shadow mask is attached.

Next, the four panel supporters 17A, 17A, 17B, and 17B are raised again to lift the lower surface of the panel on which the shadow mask is mounted, from the conveying surface of the roller conveyors 7, 7 to the top, and then to FIG. The cylinder device 9 shown in the figure is returned, and the conveyance rollers 7C of the roller conveyors 7 and 7 of both sides are moved so that they may mutually approach to the position just under the panel bottom surface. Thereafter, the four panel support ports 17A, 17A, 17B, and 17B are lowered in the city to support the panel on the conveying rollers 7C of the roller conveyors 7, 7. At this time, each stopper surface S of a pair of front panel supporters 17a and 17A immerses below the roller conveyors 7,7.

Subsequently, when the roller conveyors 7 and 7 are driven, the panel on which the shadow mask is mounted is carried out toward the front of the shadow mask mounting apparatus 1.

In the shadow mask mounting apparatus 1 of the present embodiment, in the case of attaching the shadow mask having the elastic pieces arranged at positions corresponding to the panel pins to the panel in which the panel pins are formed at the central portions of the four sides, the mask holder 21 is provided. The mask holder 33 can be used instead of the < RTI ID = 0.0 > 1) < / RTI > and the positioning unit K can be used instead.

In addition, in the case where the shadow mask mounting apparatus is used for the panel exclusively in which the panel pins are frosted, the mask holder 33 and the positioning unit K can be omitted to simplify the structure.

In the above-mentioned embodiment, although a roller conveyor is used as a pair of conveyor used for carrying in / out of a panel, you may use a conveyor of another type | mold which can carry and convey a panel to a conveyance surface, such as a belt conveyor and a slut conveyor.

In addition, in the shadow mask mounting apparatus of the present embodiment, a conveyor frame that can be moved back and forth in the same direction is supported on each of these slide frames by using a pair of slide frames capable of changing the mutually opposite intervals with respect to the main frame. You may comprise so that only one of a slide frame or a conveyor frame may move.

In addition, in the case of corresponding to a plurality of panels having different widths, the means for advancing or displacing the conveyor frame only advances and moves between the two exact positions, the conveying position and the retracting position, and does not require exact positioning accuracy. Since the positioning unit is provided on the slide frame as a means for adjusting the opposing intervals of the frames, it is necessary to use one having a high positioning accuracy so as to be able to stop at a precise position symmetrically from the center position of the apparatus. Therefore, as in the present embodiment, it is preferable to design and manufacture the drive control means by arranging the forward and backward drive means exclusively for the conveyor frame on the slide frame and independent of the means for adjusting the opposing interval of the slide frame.

As described above, according to the shadow mask mounting apparatus of the present invention, even when the shadow mask is mounted on a panel of the type in which the panel pins are provided inside the corners, the conveying of the panel to and from the device is efficiently carried out using a conveyor. It is possible to solve the problem, and the cycle time can be shortened as compared with carrying out the panel from the upper side of the apparatus using a conventional vacuum suction pad, thereby improving the work efficiency.

In addition, by installing both of the positioning unit for positioning the panel and the shadow mask at the corner portion and the positioning unit for positioning at the center of the four sides around the attachment position, the panel pin is provided inside the corner portion. It can cope with both kinds of panel of the type provided in the inside of 4 center part of a side, and can improve versatility.

Moreover, when advancing and supporting each of a pair of conveyors on the slide frame which can adjust an opposing space | interval freely, the space | interval of the said pair of conveyors can be changed according to the panel size which conveys, and it can cope with the panel of various sizes. have.

Claims (3)

A shadow mask mounting apparatus having a mechanism for attaching a shadow mask to a panel by engaging an elastic piece attached to the outside of a shadow mask with a panel pin protruding inside the corner portion of the CRT panel, wherein the shadow mask is attached to the panel. A pair of conveyors arranged in parallel on both sides of the attachment position to attach, a panel lift mechanism for elevating the panel between both conveyors over the attachment position and the upper position beyond the conveying surface of the pair of conveyors, the panel and the shadow mask A positioning unit for positioning the shadow mask and the panel disposed around the attachment position corresponding to the corners of the pair, wherein the pair of conveyors support the lower edges of the two opposite sides of the panel on both sides and are conveyed. Supported to the conveyance position and the panel lifting mechanism to approach each other so that Over the retracted position away from the both outer sides to the panel passes between the up and down the shadow mask mounting apparatus is characterized in that the advance and retreat are free configuration. A mechanism for attaching a shadow mask to the panel by engaging the elastic pieces attached to the outside of the shadow mask with the panel pins protruding inside the corners of the CRT panel and the shadows on the panel pins protruding inside the center of the four sides of the panel. A shadow mask mounting apparatus having a mechanism for attaching a shadow mask to a panel by engaging an elastic piece attached to an outer side of a center of four sides of the mask, the shadow mask mounting apparatus being disposed in parallel on both sides of an attachment position for attaching the shadow mask to the panel. A pair of conveyors, a panel elevating mechanism for elevating the panel between the two conveyors over an upper position beyond the conveying surface of the pair of conveyors and the attachment position; Positioning between the shadow mask and the panel disposed around the attachment position The pair of conveyors include a conveying position approaching each other so that the lower edges of the two sides facing the panel can be supported and conveyed from both sides, and the panel supported by the panel elevating mechanism passes up and down between them. Shadow mask mounting apparatus, characterized in that the retreat is freely configured over the retracted position spaced apart from both sides so as to be possible. The said pair of conveyors are conveyance positions which approached each other so that the lower edge parts of two opposing sides of a panel may be supported and conveyed on both sides, and the panel supported by the said panel elevating mechanism is between them. Is supported on each of the pair of slide frames to freely move forward and backward across the retracted positions spaced apart from each other so as to pass up and down, and the pair of slide frames face each other in the same direction as the opposite direction of the pair of conveyors. A shadow mask mounting apparatus, characterized in that the opposite interval is adjustable.

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