JP2002370197A - Trimming device and trimming method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a trimming method and a device capable of improving productivity by easily separating a product part from belt-like metallic sheets arranged in a plurality in the lengthwise direction by etching the product part. SOLUTION: In manufacturing a shadow mask by etching, this trimming device is provided with a receiving tray 110 for receiving the metallic sheet connected to an unnecessary part 195 by a trimming line part 181 composed of an intermittent half etching part in a lengthwise directional edge part of the product part 190 on the metallic sheet 180, and separating the mutual product parts by a through hole 182 along a metallic sheet side curved surface-like surface, a presser roller 120 for pressing the product part to the receiving tray side when pulling the unnecessary part along a trimming line, and an unnecessary part separating part for pulling and separating the unnecessary part. A metallic sheet side curved surface shape of the receiving tray is formed in the shape of plucking off when pulling the unnecessary part.

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 trimming a product such as a shadow mask, and more particularly, an unnecessary portion is provided between product portions in a direction orthogonal to a longitudinal direction thereof, and the product portion is imposed. In a state of being continuously arranged in the longitudinal direction, with a strip-shaped metal sheet provided by etching a plurality of product portions, a side portion of each product portion orthogonal to the longitudinal direction is formed in the longitudinal direction with a through hole. It is separated from the unnecessary portion or product portion adjacent thereto, and the longitudinal side of the product portion is connected to the unnecessary portion by a trimming line portion composed of an intermittent half-etched portion, and a predetermined direction orthogonal to the longitudinal direction. The present invention relates to a trimming apparatus and method for separating a product part from a metal sheet that is continuously connected to intermittent half-etched portions at positions.

[0002]

2. Description of the Related Art In recent years, mass production of a shadow mask for a color TV (cathode ray tube) has been progressing along with an increase in the usage thereof, and depending on the purpose of use, there has been a demand for a finer or larger size. Such a shadow mask is generally made of a metal plate 600 that is continuous in a band shape (see FIG. 5).
(A)), which is processed by an integrated line of photo-etching processing. In a simple manner, the metal plate 600 is continuously or intermittently moved in a hoop shape in which a band is stretched. , Plate making, etching,
An outer peripheral portion of a product portion (referred to as a shadow mask) 611 of each shadow mask is held by the metal plate 600, and the shadow mask 61 is attached to the metal plate 600.
The outer shape processing is performed with 1 imposed. (FIG. 5
(B)) Then, as shown in FIG. 5C, the metal plate material 600 is once cut, and each shadow mask 611 is separated from the cut metal sheet (FIG. 5D). (Offline method) is generally adopted. The metal sheet cut from the metal plate 600 is shown in FIG.
As shown in (b), one shadow mask (single imposition)
5 (c) and (b) as shown in FIGS. 5 (c) and 5 (a). One sheet (metal sheet 610). As the trimming method, an outer peripheral line of the shadow mask (also referred to as a trimming line 614) including a half-etched portion and / or a through-hole portion is provided in advance on the outer periphery of the shadow mask by etching. A method of holding the product part of the shadow mask by a holding mold suitable for the trimming line (which is also called a trimming line), and a method in which a person lifts an unnecessary metal plate part 612 and separates the metal part 612 from the product part. A method of bending an unnecessary metal plate portion 612 up and down has been adopted.

For example, a hoop-shaped work having a plurality of shadow masks imposed thereon is cut on a production line by a slitter 210 and a cutting cutter 220 as shown in FIG. Shadow mask 28
1 after obtaining the metal sheet 280 having
82 was trimmed. FIG. 3B shows a metal sheet 2.
In FIG. 3B, reference numeral 281 denotes a shadow mask, 285 denotes a through hole, and 286 denotes an intermittent half-etched portion. The intermittent half-etched portion is a portion where the half-etched portion and the through-hole portion are alternately continuous. In this case, the slitter 210 is not used for the slitting process, and only the cutting using the cutting cutter is performed.
As shown in FIG. 4A (corresponding to FIGS. 5C and 5A), a metal sheet 280A having a plurality of impositions may be obtained.
As shown in FIG. 3A, when performing a slitter process by a slitter following the integrated line of the photoetching process, the trimming process by the slitter is further performed separately, so that the number of steps is increased and the processing cost is increased. There was a problem.

On the other hand, as shown in FIG. 4A, when a plurality of metal sheets 280A which are imposed are trimmed on a plane to remove an unnecessary portion at the center between shadow masks 281 which are product portions. As shown by the dotted arrow C1 in FIG. 4 (a), the unnecessary portion 282 is pulled, and the trimming form does not come off. Therefore, as shown in FIG. 4 (d), the broken portion 316 is turned up and the broken surface is wavy. appear. Here, the “outside edge” means that the unnecessary portion 282 outside the product portion is pulled and the half-etched portion 286 is intermittent.
4 (a), the wire is broken while pulling outward from the product part as shown by a dotted arrow C2 in FIG. 4A. Usually, a broken part 315 is formed as shown in FIG. There is no effect of breaking on When the unnecessary portion 282 is pulled and broken along the intermittent half-etched portion 286 as shown by a dotted arrow C1 in FIG.
Usually, it is called "parallel bush." Incidentally, FIG.
FIG. 5C is a cross-sectional view illustrating a half-etched portion corresponding to the portion illustrated in FIG. As described above, when a metal sheet on which a shadow mask as a product is imposed is cut by a trimming line portion to remove unnecessary portions between products without cutting each single surface, a wavy cut surface is formed. There is a quality problem that occurs.

In addition, instead of the slitter processing by the slitter shown in FIG. 3 (a), it is conceivable to remove unnecessary parts between product parts of a part to be subjected to the slitter processing, following the integrated line of the photoetching processing. When parallel cutting is performed, as shown in FIG. 4 (d), the cut portion is cut while being turned up, so that ripples are generated around the periphery and cause a quality complaint. Had not been taken.

[0006]

As described above, there is a problem in terms of productivity when the cutting is performed for each single side, and a metal sheet on which a plurality of shadow masks as a product are imposed is used. When trimming is performed on a flat surface to remove an unnecessary portion at the center between the shadow masks, which are product portions, there is a quality problem that a wavy surface is generated on the fractured surface.
As shown in (a), when performing a slitter process by a slitter following the integrated line of the photoetching process, trimming by the slitter is performed and then trimming is further performed. In view of the above, the processing cost was high and was not practical.
Further, in place of the slitter processing by the slitter shown in FIG. 3A, when the unnecessary part between the product parts of the part to be subjected to the slitter processing is removed following the integrated line of the photoetching processing, a parallel cutting is performed. As shown in d), since the cut portion is cut while being turned up, a wavy portion is generated around the periphery, causing a quality complaint, and this cannot be performed at a practical level. The present invention corresponds to these, and specifically, an unnecessary portion is provided between the product portions in a direction orthogonal to the longitudinal direction, and the product portion is imposed, and continuously disposed in the longitudinal direction. In the state
A strip-shaped metal sheet provided by etching a plurality of product parts, separating a side part orthogonal to the longitudinal direction of each product part from an unnecessary part or a product part adjacent in the longitudinal direction by a through hole, Is a state where the side in the longitudinal direction is connected to an unnecessary portion by a trimming line portion formed of an intermittent half-etched portion, and the intermittent half-etched portions at predetermined positions orthogonal to the longitudinal direction are continuously connected. The present invention provides a trimming method for separating a product portion from a metal sheet by pulling an unnecessary portion from a metal sheet along each of the trimming lines in the longitudinal direction and separating the unnecessary portion by stripping, and a trimming device capable of performing the trimming method. What you want to do.

[0007]

SUMMARY OF THE INVENTION According to the present invention, there is provided a trimming apparatus, wherein unnecessary parts are provided between product parts in a direction perpendicular to the longitudinal direction to impose the product parts, and the imposition is continuously performed in the longitudinal direction. In a state in which a plurality of product parts are provided, a strip-shaped metal sheet provided by etching the product part, and unnecessary parts adjacent to the longitudinal direction in the longitudinal direction of each product part in a through hole at a side part orthogonal to the longitudinal direction. Separated from the product part, the longitudinal side of the product part is connected to an unnecessary part by a trimming line part formed of an intermittent half-etched part, and intermittent half-etching at a predetermined position orthogonal to the longitudinal direction. The parts are directly or directly connected through the through-hole part from the metal sheet, and the unnecessary parts are pulled along the respective trimming lines in the longitudinal direction, and the unnecessary parts are separated, so that the product part is separated from the metal sheet. A trimming device for separating the unnecessary portions along the respective trimming lines when receiving unnecessary portions of the metal sheet along the curved surface of the metal sheet side, and the unnecessary portions to the respective trimming lines. A press roller that rotates while pressing the product part against the receiving side when pulling along, and an unnecessary part separating part that separates the unnecessary part from the product part by pulling the unnecessary part along each trimming line. The curved surface on the side of the metal sheet is characterized in that it is a curved surface that becomes an outside edge when the unnecessary portion is pulled along each trimming line. In the above, the unnecessary portion separating portion has a winding roll having a winding shaft in a direction orthogonal to the longitudinal direction of the strip-shaped metal sheet. Further, in the above, the product part is a shadow mask.

[0008] The term "imposition of a product portion on a strip-shaped metal sheet" as used herein means that a plurality of product portions are arranged in a direction orthogonal to the longitudinal direction of the metal sheet. A plurality of metal sheets formed continuously along the longitudinal direction are targeted for trimming.
A through-hole is provided along the side in the direction orthogonal to the longitudinal direction of the metal sheet of the outer peripheral line of the product portion, and a through hole is provided outside the side. The outer side is formed by intermittent half etching along the longitudinal side of the metal sheet. A trimming line portion is provided, and the product portion is cutably connected to an unnecessary portion by a trimming line portion formed by intermittent half etching provided along the longitudinal side of the metal sheet and provided on the outside thereof.

According to the trimming method of the present invention, unnecessary parts are provided between the product parts in a direction perpendicular to the longitudinal direction to impose the product parts, and a plurality of the impositions are arranged continuously in the longitudinal direction. In the state, with a strip-shaped metal sheet provided by etching the product part, the side part orthogonal to the longitudinal direction of each product part is separated from unnecessary parts or product parts adjacent in the longitudinal direction by through holes, The longitudinal side of the product portion is connected to an unnecessary portion by a trimming line portion including an intermittent half-etched portion, and the intermittent half-etched portions at predetermined positions orthogonal to the longitudinal direction are directly or penetrated. Unnecessary portions are pulled from the metal sheet continuously connected through the holes along the respective trimming lines in the longitudinal direction,
A trimming method for separating a product portion from a metal sheet by separating an unnecessary portion, wherein the unnecessary portion is pulled so as to become an outside edge when the unnecessary portion is pulled along each trimming line. It is assumed that. In the above, the product part is a shadow mask.

[0010]

According to the trimming device of the present invention, an unnecessary portion is provided between the product portions in a direction perpendicular to the longitudinal direction of the trimming device, thereby imposing the product portion, and the trimming device is provided with the longitudinal portion. In a state in which a plurality of products are continuously arranged in the direction, a strip-shaped metal sheet provided by etching a product portion, and a side portion orthogonal to the longitudinal direction of each product portion is adjacent to the longitudinal direction by a through hole. Separated from the unnecessary part or the product part, the side part in the longitudinal direction of the product part is connected to the unnecessary part by a trimming line part composed of an intermittent half-etched part, and at a predetermined position orthogonal to the longitudinal direction. The intermittent half-etched portions are pulled directly from the metal sheet that is continuously connected through the through-hole portion or directly through the through-hole portion. Ri, thereby enabling to provide a trimming apparatus capable of separating the product portion from a metal sheet. In particular, by using the trimming device of the present invention, it is possible to perform trimming with a high quality external trimming method in-line with a photoetching processing integrated line. Specifically, when pulling the unnecessary portion along each trimming line, a cradle for receiving the metal sheet along the curved surface on the metal sheet side, and when pulling the unnecessary portion along each trimming line, It has a holding roller that rotates while pressing the product part against the receiving side, and an unnecessary part separating part that separates the unnecessary part from the product part by pulling the unnecessary part along each trimming line, and has a curved surface on the metal sheet side of the receiving base. This is achieved by the curved surfaces, each of which is a curved surface that pulls out when the unnecessary portion is pulled along each trimming line.

This is particularly effective when the product part is a shadow mask. Also, unlike the method of fatigue-breaking the trimming wire, no iron powder is generated during trimming.

With such a configuration, the trimming device of the present invention provides an unnecessary portion between the product portions in a direction perpendicular to the longitudinal direction thereof to impose the product portion, and also performs the imposition in the longitudinal direction. In a state in which a plurality of products are continuously arranged in the direction, a strip-shaped metal sheet provided by etching a product portion, and a side portion orthogonal to the longitudinal direction of each product portion is adjacent to the longitudinal direction by a through hole. Unnecessary part or separated from the product part, in a state where the longitudinal side of the product part is connected to the unnecessary part by a trimming line part comprising an intermittent half-etched part,
In addition, the intermittent half-etched portions at predetermined positions perpendicular to the longitudinal direction are unnecessary along the respective trimming lines in the longitudinal direction from the metal sheet continuously or directly connected through the through-hole portion, by a stripping method. By pulling the part and separating the unnecessary part, it is possible to provide a trimming method capable of separating the product part from the metal sheet. This is particularly effective when the product section is a shadow mask.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described with reference to the drawings. FIG. 1A is a schematic diagram showing only a characteristic part of an example of an embodiment of a trimming apparatus according to the present invention.
FIG. 2B is a schematic view of one example of a metal sheet to be trimmed, and FIG. 2A is a schematic view of a cross section taken along A1-A2 in FIG. 1A and orthogonal to the metal sheet. (B) is a figure for demonstrating the edge when using a receiving stand different from the receiving stand shown in FIG. 1 (a). FIG. 1 (a)
The unnecessary part separating part other than the take-up roll part which controls and supports the take-up roll is omitted here. Also, in FIG. 2, thick arrows indicate directions in which force is applied. In FIG. 1, 110 is a cradle, 110A is a curved surface, 11
0a is a projecting portion, 110b is a recessed portion, 120 is a holding roller, 130 is a take-up roll (part of an unnecessary portion separating portion), 141 and 142 are transport rolls (also serving as guide rolls), 150 is a conveyor belt, 180 is a metal sheet, 181 is a trimming line part of intermittent half etching,
182 is a through hole, 190 is a product part, 195, 195
A and 195B are unnecessary parts.

An embodiment of a trimming device according to the present invention will be described with reference to FIG. The trimming device of the present example shown in FIG. 1A uses a photo-etching process as shown in FIG.
A band-shaped metal sheet in which two unnecessary parts 90 are provided between product parts and imposed, and a plurality of the impositions are continuously arranged in the longitudinal direction, and are orthogonal to the longitudinal direction of each product part. A side portion is a through hole 182, and a side portion in the longitudinal direction of the product portion is a trimming line portion 181 formed of an intermittent half-etched portion.
The intermittent half-etched portions connected to unnecessary portions at a predetermined position orthogonal to the longitudinal direction are directly or continuously connected through a through-hole portion from a metal sheet.
Unnecessary portions 19 along the respective trimming lines 181 in the longitudinal direction.
5 is a trimming device for separating the product part 190 from the metal sheet 180 by separating the unnecessary part 195 from the metal sheet 180. When the unnecessary portion 195 is pulled along each trimming line 181, the cradle 110 for receiving the metal sheet 180 along the curved surface on the metal sheet side and the unnecessary portion 195 are pulled along each trimming line 181. At this time, an unnecessary part separating unit having a holding roller 120 that rotates while pressing the product part 190 against the receiving table 110 and a take-up roll 130 that separates the unnecessary part from the product part by pulling the unnecessary part along each trimming line (as a whole, FIG. (Not shown). FIG. 1A shows a case where a trimming device is provided continuously to the photoetching processing line.

The curved surface (corresponding to 110A in FIG. 2A) of the pedestal 110 on the side of the metal sheet 180 is a curved surface which becomes an outside edge when an unnecessary portion is pulled along each trimming line. . The cradle 110 is a metal sheet 180
Along the surface on the metal sheet 180 side, for example, when the surface of the pedestal 110 on the metal sheet 180 side is made of a magnetic material (when the product part is a shadow mask made of a magnetic material) It is also possible to use a permanent magnet or an electromagnet to make the iron plate magnetic, thereby causing the metal sheet to follow the iron plate. In the trimming apparatus of this example, the take-up roll 130 is disposed on the metal sheet 180 with the rotation center axis substantially parallel to the metal sheet surface, and is unnecessary in the cross section shown in FIG. When separating the portion (corresponding to 195 in FIG. 1B), the trimming line portion 18 is used.
1 (in the direction of the thick arrow in FIG. 2A), and the trimming line portion 181 is broken. While being held down by the holding roller 120, the metal sheet 180
The unnecessary portion 195A between the impositions is located at the protruding portion 110a of the curved surface of the cradle 110, and the band-shaped metal sheet 180 is formed.
The unnecessary portions 195B at both ends of the band are located at the concave portions 110b and 110c of the curved surface of the cradle 110. As a result, the break of the trimming line portion 181 is all performed by the outer edge.

In the case of using a pedestal having a shape corresponding to FIG. 2A as shown in FIG. 2B, in order to separate unnecessary portions by erosion, the band width side of the band-shaped metal sheet 180 is required. 2B, the force applied to the unnecessary portions 195B at both ends must be directed to the width direction of the band and to the outside of the band as shown in FIG. 2B. For this reason, in this case, a complicated configuration is used in which a plurality of winding rolls (a total of three winding rolls) are used instead of one winding roll as in this example.

The press roller 120 presses the metal sheet 180 against the receiving table 110 while rotating. The portion in contact with the metal sheet can press the metal sheet with some elasticity without scratching the product part such as urethane rubber. It is made of a material that can be used. Conveyor belt 15
1 is mainly for transporting the separated product part, and as shown in FIGS. 1A and 2B, includes a receiving table 110 and a belt conveyor system in a transport direction to a predetermined position. Things that move. On the product part side (metal sheet side), a material that does not damage the product part, such as rubber, is usually used. When the product part is made of an iron-based material such as a shadow mask, for example, a permanent magnet or an electromagnet may be provided on the side opposite to the product part side along the conveyor belt to control the transport state.

In FIG. 1A, a metal sheet supply port 17 is provided.
Reference numeral 0 denotes a supply port for supplying the photo-etched metal sheet 180 to the trimming device side. Transport rollers 141 and 142 serve to feed the photo-etched metal sheet 180 to the trimming device side. It is for carrying.

Here, the operation of the trimming apparatus of this embodiment will be briefly described. This is an example of an embodiment of the trimming method of the present invention. First, the metal sheet 110 that has been subjected to the photo-etching process is transported to the receiving table 110 via the transport rolls 141 and 142 in a state where the belt is stretched (this may be referred to as a hoop shape). As a result, it is pressed against the cradle 110 side. Then, the metal sheet 110 is
At the position 20 (position A1-A2), the product portion is pressed inside the product portion along the trimming line portion 181, and unnecessary portions thereof (195A, 195B in FIG. 1B) are taken up from the traveling direction by the take-up roll. It is pulled and broken at 130. Here, the metal sheet 180 is along the curved surface (110A in FIG. 2A) on the metal sheet side of the pedestal 110, and the breakage of the trimming line portion 181 is performed by all of the cutout. The take-up roll 130 is an unnecessary part 1
Unnecessary portions 195A and 195B are wound up while pulling 95A and 195B to break the trimming line portion 181. The product section 190 separated from the unnecessary sections 195A and 195B is
While being placed on the conveyor belt 150, it is transported to a predetermined position. In this way, while the metal sheet 180 is being conveyed, the unnecessary portions 195A, 1
The 95B can be separated by a strip, and only the product section 190 can be obtained.

In this embodiment, the unnecessary portion is separated by pulling with a take-up roll, and the unnecessary portion is wound on a take-up roll. The method of pulling the unnecessary portion and the method of collecting the unnecessary portion are described below. A different form from this example may be adopted.

[0021]

According to the present invention, as described above, the unnecessary parts are provided between the product parts in the direction orthogonal to the longitudinal direction, the product parts are imposed, and they are arranged continuously in the longitudinal direction. In a strip-shaped metal sheet provided by etching a plurality of product parts, a side part orthogonal to the longitudinal direction of each product part is separated from unnecessary parts or product parts adjacent in the longitudinal direction by through holes, In the state in which the side portion in the longitudinal direction of the product portion is connected to an unnecessary portion by a trimming line portion formed of an intermittent half-etched portion, and the intermittent half-etched portions at predetermined positions orthogonal to the longitudinal direction are continuous. A trimming method for separating a product part from a metal sheet by pulling an unnecessary part along the respective trimming lines in the longitudinal direction from the connected metal sheet and separating the unnecessary part with an outer edge,
Further, it is possible to provide a trimming device capable of performing this. In particular, it is possible to perform trimming by a high quality trimming method in-line with the integrated photoetching processing line, thereby improving productivity.

[Brief description of the drawings]

FIG. 1A is a schematic diagram showing only a characteristic portion of an example of an embodiment of a trimming device according to the present invention, and FIG.
FIG. 3 is a schematic view of an example of a metal sheet to be trimmed.

FIG. 2A is a schematic view of a cross section in a direction passing through A1-A2 of FIG. 1A and orthogonal to a metal sheet.
(B) is a figure for demonstrating the edge when using a receiving stand different from the receiving stand shown in FIG. 1 (a).

FIG. 3 is a schematic diagram for explaining separation into metal sheets using a conventional slitter.

FIG. 4 is a diagram for explaining an external stiffness;

FIG. 5 is a view for explaining a manufacturing method and separation of a shadow mask.

[Explanation of symbols]

110 Receiving stand 110A Curved surface 110a Projecting portion 110b Depressed portion 120 Holding roller 130 Take-up roll (part of unnecessary portion separating portion) 141, 142 Transport roll (also serves as guide roll) 150 Conveyor belt 180 Metal sheet 181 Intermittent half etching Trimming line part 182 through-hole part 190 product part 195, 195A, 195B unnecessary part 210 slitter 220 cutting cutter 241, 242 transport roll 245, 246 transport roll 280, 280A metal sheet 281 shadow mask 281A perforated area 282 unnecessary part 282 285 Through hole portion 286 Intermittent half-etched portion 310 Base material 311 Hole portion (etching removed portion) 312 Thin portion 315 Break portion 600 Metal plate material 610 Metal sheet 611 Production of shadow mask Part (This is called a shadow mask) 611A opening formation region 612 required of the metal plate 614 trimming line portion

Claims (5)

[Claims] 1. A product part in a state where unnecessary parts are provided between product parts in a direction orthogonal to the longitudinal direction to impose the product part, and a plurality of the impositions are continuously arranged in the longitudinal direction. In a strip-shaped metal sheet provided by etching, a side portion orthogonal to the longitudinal direction of each product portion is separated from an unnecessary portion or a product portion adjacent in the longitudinal direction by a through hole, and the longitudinal direction of the product portion is separated. Direction side is connected to an unnecessary part by a trimming line part comprising an intermittent half-etched part, and
The intermittent half-etched portions at predetermined positions orthogonal to the longitudinal direction are directly or directly connected to each other through a through-hole portion from a metal sheet, and pull unnecessary portions along the respective trimming lines in the longitudinal direction to remove unnecessary portions. A trimming device for separating a product part from a metal sheet by separating the metal part from the metal sheet, and receiving the metal sheet along a curved surface of the metal sheet when the unnecessary part is pulled along each trimming line. When pulling the cradle and unnecessary parts along each trimming line, a holding roller that rotates while pressing the product part against the receiving side, and an unnecessary part separation part that pulls the unnecessary part along each trimming line and separates it from the product part And a curved surface on the metal sheet side of the cradle, which is a curved surface that becomes an outside edge when the unnecessary portion is pulled along each trimming line. Trimming apparatus according to claim Rukoto. 2. The trimming device according to claim 1, wherein the unnecessary portion separating portion has a winding roll having a winding axis in a direction orthogonal to a longitudinal direction of the strip-shaped metal sheet. 3. The method according to claim 1, wherein the product unit comprises:
A trimming device, which is a shadow mask. 4. A product part in a state where unnecessary parts are provided between product parts in a direction orthogonal to the longitudinal direction to impose the product part, and a plurality of the impositions are continuously arranged in the longitudinal direction. In a strip-shaped metal sheet provided by etching, a side portion orthogonal to the longitudinal direction of each product portion is separated from an unnecessary portion or a product portion adjacent in the longitudinal direction by a through hole, and the longitudinal direction of the product portion is separated. Direction side is connected to an unnecessary part by a trimming line part comprising an intermittent half-etched part, and
The intermittent half-etched portions at predetermined positions orthogonal to the longitudinal direction are directly or directly connected to each other through a through-hole portion from a metal sheet, and pull unnecessary portions along the respective trimming lines in the longitudinal direction to remove unnecessary portions. This is a trimming method of separating the product part from the metal sheet by separating, and when the unnecessary part is pulled along each trimming line,
A trimming method characterized in that each of them is pulled so as to form an outside. 5. The trimming method according to claim 4, wherein the product section is a shadow mask.