JPH0126747B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an apparatus for manufacturing a flat mask of a shadow mask for a color cathode ray tube.
The present invention relates to a device that performs a coating operation in which micropores are filled with a coating liquid such as varnish.

[Technical background of the invention]

In general, flat masks for color cathode ray tubes are manufactured by applying a photosensitive liquid to a strip of material such as an iron plate, printing a desired pattern on the strip, and then performing a printing and etching process.

Incidentally, in recent years, as typified by display tubes, the hole pitch and hole diameter of flat masks are finer than those for consumer use, and as in the conventional etching process, etching is performed from the top and bottom surfaces of a strip at the same time. If holes are made by spraying etching liquid, the quality of the unevenness is poor and it is almost impossible to produce good quality products. In particular, it is difficult to drill holes smaller than the thickness of the board using conventional methods.

Therefore, a so-called two-stage etching method is used. In other words, the upper surface or both sides of the strip is slightly etched in the first step, then washed with water and dried, and only the top surface where the holes were made in the first step is filled with a coating solution such as varnish.After drying, the bottom surface is etched in the second half of the etching step. A flat mask is manufactured by etching the mask until the holes penetrate through it, and then removing the varnish and the resist. By doing so, it is possible to reduce variations in the diameter of the micropores and obtain a flat mask with good unevenness quality.

FIGS. 1 and 2 show a state in which the first stage etching process in the two-stage etching process has been completed. The strip 1 made of iron plate is etched at a constant speed (usually 1 to 3 m/s) using an etching device.
min) and is held horizontally and sent continuously,
A desired pattern 2 is etched. That is, the resist 3 is placed on the upper and lower surfaces of the strip 1.
4 is adhered in a desired pattern, holes 5 are made only on the upper surface by etching in the previous step, and a coating liquid 6 such as varnish is applied to the holes 5 on the upper surface. Note that the hole shape 7 in the middle of etching in the latter stage is indicated by a dotted line in FIG.

In such a two-stage etching process, when the holes 5 made in the previous stage are filled with a coating liquid 6 such as varnish, an apparatus as shown in FIG. 3 has conventionally been used. In this device, an endless conveyor belt 12 is stretched around rollers 11 arranged above and below the front stage, and a take-up roller 13 for adjusting the tension of the conveyor belt 12 is brought into contact with one side of the conveyor belt 12. A driving device (not shown) is connected to the roller 11 of the roller 11, and the strip 1 is supported on the upper side of the conveyor belt 12 and conveyed at a constant speed.

Further, a spray gun 14 is provided above the conveyor belt 12 so as to be able to reciprocate in a lateral direction orthogonal to the direction in which the strip 1 travels.

Then, the strip 1 is continuously conveyed at a constant speed by the conveyor belt 12, and the spray gun 14 is reciprocated in the lateral direction, so that a coating liquid 6 such as varnish is applied only to the upper surface of the strip 1 over the entire area. Apply.

In this case, if the coating liquid 6 such as varnish gets around the bottom surface of the strip 1, the part to which this coating liquid 6 has adhered will not be etched in the subsequent etching process and will be defective. Standing,
It is necessary to prevent the coating liquid 6 from getting around the lower surface of the strip 1.

Therefore, a feeding device 16 for the roll-shaped shielding paper 15 is disposed at the rear of the conveyor belt 12, and a winding device 17 is disposed at the front, and the shielding paper 15 is disposed between the conveyor belt 12 and the strip 1. By inserting the strip 1 and the shielding paper 12 through the guide roller 18 and feeding the strip 1 and the shielding paper 12 synchronously, it is possible to prevent the coating liquid 6 from going around from both side edges of the strip 1 to the lower surface.

[Problems with background technology]

However, according to such a method, the shielding paper 15
The same length as the processing length of the strip 1 is required, and a large amount of shielding paper 15 is consumed, resulting in high running costs.Furthermore, when the roll paper is about to run out, the device must be stopped and a new roll paper inserted. In addition to poor work efficiency, troubles such as paper cuts are likely to occur, and the operating rate of the equipment is poor.

[Purpose of the invention]

The present invention is an attempt to solve the above-mentioned problem, and the present invention reliably prevents coating liquid such as varnish from going around to the lower surface of the strip by the conveyor belt itself, and prevents it from being shielded as in the past. By not using paper, it is possible to eliminate the need to replace shielding paper, improve the operating rate of the device, and enable stable operation over a long period of time.

[Summary of the invention]

The present invention provides a flat mask manufacturing apparatus that supports and conveys a strip on which a desired pattern has been etched on a conveyor belt, and applies a coating liquid onto the upper surface of the strip using a spray gun. The conveyor belt is divided into both sides, and the position of the conveyor belts on both sides can be freely adjusted in the width direction, so that the position of the conveyor belts on both sides can be set according to the width of the strip. It is something.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIGS. 4 and 5.

In FIG. 4, reference numeral 21 denotes a conveying device, and this conveying device 21 has spline shafts 22 horizontally mounted in parallel and rotatably at the front, rear, upper and lower parts, and each of the spline shafts 2
2, rollers 23 on both sides are supported by spline fitting so as to be fixed in the rotational direction and movable in the lateral direction, and a groove 24 is formed in the center of the outer peripheral surface of the rollers 23 on both sides. Further, a conveyor belt 25 consisting of an endless magnetic belt split on both sides is stretched around each of the rollers 23 on both sides. The matching protrusions 26 are integrally provided in a protruding manner. Further, a spline shaft 27 is horizontally suspended at the front of the conveyor belts 25 on both sides, and take-up rollers 28 that are in contact with the outer surfaces of the belts 25 on both sides are fixed in the rotational direction by spline fitting on both sides of the spline shaft 27. and is supported so as to be movable in the lateral direction.

Further, as shown in FIG. 5, each spline shaft 22 is rotatably supported by bearings 29 on both sides, and a motor 31 is connected to the outer end of one spline shaft 22 via a coupling ring 30. connected. Furthermore, the rollers 23 on each side are as follows:
A ball spline 34 is provided at the center via a key 32 and a stop shaft 33, and is fitted to the spline shaft 22 via the ball spline 34.

A positioning device 35 is provided for the roller 23. In this positioning device 35, a guide shaft 37 and a threaded shaft 39 having opposite threaded portions 38 on both sides are supported between bearings 36 on both sides in the vicinity of the spline shaft 22,
A coupling ring 4 is attached to the outer end of this screw shaft 39.
A motor 41 is connected via 0. Also,
The movable brackets 42 on both sides are supported by the guide shaft 37 so as to be movable forward and backward, and the movable brackets 42 on both sides are hinged to the threaded portions 38 on both sides of the screw shaft 39 so as to be movable forward and backward. The rollers 23 on both sides above
An engaging element 43 consisting of a pair of rollers that abuts on both sides of is provided. Further, the motor 4 is placed facing the moving part of the movable bracket 42 on one side.
Proximity switches 44, 45, and 46 are provided to control 1.

Although not shown, the take-up rollers 28 on both sides are also provided with positioning devices similar to those described above.

The positioning device 35 of each roller 23 and the screw shaft 39 of the positioning device of the take-up roller 28 are designed to rotate synchronously via interlocking mechanisms such as sprockets and chains.

Further, as shown in FIGS. 4 and 5, a spray gun 47 is provided above the conveyance device 21 so as to be able to reciprocate in a lateral direction perpendicular to the direction in which the strip 1 travels.

Then, the motor 31 is driven to rotate one spline shaft 22 and the rollers 23 on both sides thereof, and the conveyor belts 25 on both sides are rotated synchronously, and the above-mentioned belt-shaped object supported on the upper side of the rotation is rotated. 1 is continuously conveyed at a constant speed, and at the same time, the spray gun 47 is reciprocated in the lateral direction to apply a coating liquid 48 such as varnish to the upper surface of the strip 1 over the entire area.

At this time, the belt-shaped body 1 made of an iron plate has its lower surface on both sides connected to a conveyor belt 2 made of magnetic belts on both sides.
5 and is sent with both side edges of the strip 1 aligned with the outer edges of the conveyor belts 25 on both sides, and the varnish etc. from the spray gun 47 wraps around the bottom side of the strip 1. It prevents

Furthermore, when the width dimension of the strip 1 changes, the motor 41 of the positioning device 35 is driven, the screw shaft 39 is rotated, the movable brackets 42 on both sides are moved toward each other or away from each other, and the engager 43, and when the rollers 23 on both sides reach a predetermined position, proximity switches 44, 45, 46 set to a predetermined width are activated.
is activated, the motor 41 is stopped, and the rollers 2 on both sides are
3 in a predetermined position, and in this way, the strip 1
The positions of the rollers 23 on both sides are changed according to the width dimension of the band 1, and the edges on both sides of the strip 1 are aligned with the outer edges of the conveyor belts 25 on both sides. In this case, the take-up rollers 28 are also lost and positioned together with the rollers 23 on both sides.

Note that the concave groove 24 of each roller 23 and the conveyor belt 2
By engaging with the protrusions 26 of No. 5, it is possible to prevent the conveyor belt 25 from meandering.

〔Effect of the invention〕

According to the present invention, the conveyor belts on both sides are positioned according to the width of the belt-like object, and the belt-like object is conveyed in a state where both side edges of the belt-like object match the outer edges of the conveyor belts on both sides. The belt can reliably prevent coating liquids such as varnish from getting around to the bottom side of the strip, and by not using conventional shielding paper, running costs can be reduced, and it is easier to replace the shielding paper. This eliminates the need for paper cuts and accidents such as paper cuts, which improves the operating rate of the device and allows it to operate stably over a long period of time.

In addition, by forming the conveyor belt with a magnetic belt, it has good adhesion with the belt-shaped object, and it is possible to more reliably prevent varnish from getting around to the lower surface. Meandering of the conveyor belt can be prevented by providing protrusions and grooves on the rollers and engaging them.

[Brief explanation of drawings]

Fig. 1 is a perspective view of a strip forming a flat mask, Fig. 2 is an enlarged sectional view thereof, Fig. 3 is a perspective view of a conventional device, and Fig. 4 is a perspective view showing an embodiment of the device of the present invention. FIG. 5 is a sectional view of a part thereof. DESCRIPTION OF SYMBOLS 1... Band-shaped body, 2... Pattern, 23... Roller, 24... Concave groove, 25... Conveyance belt, 26...
...Protrusion, 47...Spray gun, 48...Coating liquid.

Claims (1)

[Scope of Claims] 1. A flat mask manufacturing apparatus that supports and conveys a strip on which a desired pattern has been etched on a conveyor belt, and applies a coating liquid onto the upper surface of the strip using a spray gun, An apparatus for manufacturing a flat mask, characterized in that the conveyor belt for the belt-shaped body is formed in sections on both sides, and the conveyor belts on both sides are provided so that their positions in the width direction can be freely adjusted. 2. The flat mask manufacturing apparatus according to claim 1, wherein the conveyor belt is formed of a magnetic belt. 3. A patent claim characterized in that the conveyance belt has at least one protrusion formed on the side opposite to the conveyance surface of the strip, and the protrusion engages with a groove of a roller that supports the conveyance belt. An apparatus for manufacturing a flat mask according to item 1 or 2.