KR101255257B1 - Apparatus for manufacturing of identification tag - Google Patents

Abstract

PURPOSE: An identification tag manufacturing device is provided to remove the stress applied to a punch and the lower mold part due to the generation of defects, thereby preventing the decrease of the precision of the punch and the lower mold part. CONSTITUTION: An identification tag manufacturing device comprises a feeder, a blanking press, a belt conveyor unit, a turntable, a sheet(150), a first bending press and a second bending press. The first bending press uses an inner punch(162), an outer punch(164) and the sheet to pressurize a half-finished identification tag product(S) from above and below to bend the rim(S1) of the half-finished product to be inclined inside after the half-finished product is positioned in the mounting groove of a lower mold part(142). The second bending pressurizes the rim to be closely contacted to the upper side of the half-finished product.

Description

Dog tag manufacturing equipment {APPARATUS FOR MANUFACTURING OF IDENTIFICATION TAG}

The present invention relates to an identification tag manufacturing apparatus, and more particularly, a tag in a semi-finished state in which an edge cut from a sheet material is bent at a right angle through a blanking press and received at an anchor groove formed in a lower mold of a turntable to bend at an angle. The edge of the edge is pressed inwardly by the first bending press and the edge is bent inwardly.In the second bending press, the edge of the edge adheres to the upper surface of the semi-finished product so that the edge of the identification tag is bent outwardly or compressed in that state. It relates to an identification tag manufacturing apparatus that does not occur.

In general, a dog tag issued to a soldier is a thin metal plate engraved with the soldier's name, group number, blood type, etc., usually made of stainless steel or a lightweight aluminum alloy that does not corrode.

The identification tag is usually oval about 5cm in length and about 3cm in width or round about 3 ~ 4cm in diameter, and is designed to be hung on the neck with a string of stainless beads or strings so as to identify the soldier in case of injury or death. Soldiers must always carry them.

In addition, the tag is worn by the general public as well as soldiers, people who have a physical and mental illness, such as infants and young people who are poor at coping with emergencies, mainly wear a tag to get help from the people around them. To provide information.

As described above, the identification tags worn by the general public are also engraved with numbers or letters to identify the wearer's name or social security number or phone number and address for emergency contact.

Such a tag is generally manufactured by press working. In other words, in order to manufacture the tag, a plate of stainless or aluminum alloy is first placed between the upper mold (punch) and the lower mold imprinted with the shape of the tag, and then the upper mold is lowered to cut the plate into the shape of the tag (BLANKING). Done.

As such, after cutting the plate in the shape of the identification tag, the edge of the plate is polished or bent to finish the treatment so that the wearer is not injured by the cut of the plate.

However, the polishing process during the finishing of the tag as described above has to rely on manual labor, so that the productivity of the tag is not only reduced, but also the polishing results vary depending on the skill of the operator, resulting in a problem that the quality is not uniform.

Therefore, in order to solve the problem as described above, the secondary press working is performed to bend the sharp edge of the cut sheet to the inside of the sheet. This will be described with reference to Fig.

1 is a schematic diagram showing a press working on the edge of a conventional identification tag. Referring to the drawings, the semi-finished product on the upper surface of the lower mold (M) as shown in Fig. 1A to bend the edge of the plate S (hereinafter referred to as "semi-finished product") cut into the shape of the identification tag. (S) will be enshrined.

When the semi-finished product S is placed on the upper surface of the lower mold M as described above, as shown in FIG. 1B, the punch P installed on the upper portion of the lower mold M is directed toward the lower mold M. By pressing the semi-finished product (S) to bend the edge of the semi-finished product (S) at a right angle.

As described above, when the edge of the semi-finished product S is bent upward, the bending process of bending the bent edge toward the inside of the semi-finished product S as shown in FIG. 1C is in close contact with the upper surface of the semi-finished product S. The secondary press working is performed to bend the sharp edge of the semi-finished product S inwardly.

However, during the secondary press working to bend the edge of the semi-finished product (S) as described above, as shown in (A) and (B) of FIG. 2, the defect that the edge of the semi-finished product (S) is not bent inward is Will occur.

That is, if the semi-finished product S placed in the lower mold M is not in place due to the inflow or vibration of foreign matter, or the bending process is performed while the edge of the semi-finished product S is not bent at a right angle, the semi-finished product ( The defects such as the edges of S) are bent to the outside without facing inward (see A in FIG. 2) or the crimp (see B in FIG. 2) such that the edges of the semi-finished products S bent at right angles are lowered in that state. do.

The defective product thus generated is a waste of raw materials and time and labor for the selection and removal of the defective product, resulting in economic losses, as well as a punch (P) or lower part in contact with the defective part of the semi-finished product (S). There is a problem that causes a continuous stress on the mold (M) to reduce the precision of the punch (P) or the lower mold (M).

The present invention is to solve the above problems, when the bending process is performed to bend the edge of the semi-finished product cut in the shape of the identification tag inwardly the edge is bent to the outside or the edge is settled in the state that the defect is compressed It is an object of the present invention to provide an identification tag manufacturing apparatus that does not occur.

Technical idea of the present invention for achieving the above object, the feeder for supplying the plate material, the blanking press for cutting the plate material supplied from the feeder to the outer shape of the identification tag and bending the edge at right angles to form a semi-finished product, A belt conveyor unit for carrying the semi-finished product manufactured by the blanking press, a turntable for receiving and rotating the semi-finished product transported through the belt conveyor unit in the settling groove formed in the lower mold, and the bottom of the settling groove formed in the lower mold of the turntable. Forming the sheet and the elevating in the settling groove, and installed on one side of the turntable, the identification tag semi-finished product (S) located in the settled groove of the lower mold is pressed by the upper punch and the outer punch and the sheet from the top and bottom of the semi-finished product (S) The first bending press and the first bending press installed to bend the edge S1 inwardly inclined. The identification tags is accomplished by the manufacturing apparatus comprises a bending press 2 and is provided at the rear of the switch urges the rim bent obliquely in a first bending press to contact the rim on the upper surface of the semi-finished product.

Here, the first bending press has an inner punch that descends toward the semi-finished product received in the lower mold of the turntable, an outer punch that wraps around the inner punch and descends toward the semi-finished product positioned in the settling groove of the lower mold and the sheet. It is preferable to include a power supply unit which is installed at the bottom and provides power to lift the seat in the settling groove.

In addition, the outer punch is preferably formed with an inclined surface toward the axis of the inner punch in its inner diameter.

In addition, the power supply unit is a protrusion projecting downward from the bottom of the seat and one end is in contact with the protrusion and the other end is connected to the rod of the hydraulic cylinder and the other end is fixed with a hinge pin between one end and the other end is fixed It is preferable to include the arm which rotates relatively about this hinge pin.

One end of the arm is bent toward the bottom of the sheet to be in contact with the protrusion, and the protrusion and the end of the arm which are in contact preferably form a circle.

According to the identification tag manufacturing apparatus of the present invention, the edge of the semi-finished product passed through the blanking press is bent inwardly in the first bending press, and then the edge of the edge is bent outwardly because the end of the edge is in close contact with the upper surface of the semi-finished product in the second bending press. There is an effect of improving the productivity of the identification tag because the defect does not occur, such as the edge is pressed down to the state is compressed.

In addition, as described above, when the edges are not bent outwardly or the edges are squeezed to the state where the edges are not compressed, the stresses applied to the punch and the lower mold may be eliminated due to the defects. The precision can be prevented from falling.

1 is a schematic diagram showing a press working on the edge of a conventional identification tag.
2 is a schematic view showing the type of defects occurring during conventional press working.
Figure 3 is a perspective view schematically showing the overall configuration of the identification tag manufacturing apparatus according to the present invention.
Figure 4 is a plan view schematically showing the overall configuration of the identification tag manufacturing apparatus according to the present invention.
Figure 5 is a schematic diagram showing the manufacturing of the semi-finished product by the blanking press of the identification tag manufacturing apparatus according to the present invention.
Figure 6 is a schematic diagram showing the first and second bending press of the identification tag manufacturing apparatus according to the present invention.
7 is a cross-sectional view showing a first bending press of the identification tag manufacturing apparatus according to the present invention.
8 and 9 are cross-sectional views showing an operating state of the first bending press.
10 is a cross-sectional view showing a second bending press of the identification tag manufacturing apparatus according to the present invention.
FIG. 11 is a schematic view showing a state in which a protrusion of a seat and one end of an arm are in contact with each other in the power supply unit of the first bending press. FIG.

The terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary meanings and the inventor may properly define the concept of the term to describe its invention in the best possible way And should be construed in accordance with the principles and meanings and concepts consistent with the technical idea of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Figure 3 is a perspective view schematically showing the overall configuration of the identification tag manufacturing apparatus according to the present invention, Figure 4 is a plan view schematically showing the overall configuration of the identification tag manufacturing apparatus according to the present invention.

Referring to the drawings, the identification tag manufacturing apparatus according to the present invention is largely the feeder 110 for supplying the plate material, the plate material supplied from the feeder 110 is cut into the outer shape of the identification tag and the edge (S1) at right angles Blanking press 120 to bend to form a semi-finished product (S), belt conveyor unit 130 for transporting the semi-finished product (S) manufactured in the blanking press 120, and conveyed through the belt conveyor unit 130 The turntable 140 receives and rotates the semi-finished product S in the settling groove 144 formed in the lower mold 142, and forms the bottom of the settling groove 144 formed in the lower mold 142 of the turntable 140. The semi-finished product (S) is installed on the seat 150 and the upper and lower portions of the turntable 140 and positioned in the settling groove 144 of the lower mold 142, but the upper and lower seats 150 are elevated in the settling groove 144. Bend the edge S1 of the semi-finished product S inwardly by pressing at Is installed at the rear of the first bending press 160 and the first bending press 160 pressurizes the edge (S1) bent obliquely in the first bending press 160 to the semi-finished product (S) It consists of a second bending press 170 in close contact with the upper surface of the.

In other words, the feeder 110 is to feed the sheet material, which is the data of the identification table, to the reel 112 and to supply it to the blanking press 120, which is installed in close proximity to the blanking press 120. The feeder 110 is provided with a driving motor (not shown) for rotating the reel 112 at a uniform speed, the plate material wound on the reel 112 in accordance with the operation of the drive motor at a uniform speed on the blanking press 120. Will be supplied.

On the other hand, the blanking press 120 is to press the plate material supplied from the feeder 110 to cut in the shape of the identification tag, the blanking press 120 is a stage 122 that the plate material supplied from the feeder 110 is placed And the blanking mold 124 and the blanking mold 124 in which the shape of the identification tag is sequentially imprinted so as to have a shape of the identification table so that the supplied sheet material is installed on the stage 122 and placed in the blanking mold 124. It consists of the blanking punch 126 which pressurizes the board | plate material which was made.

When the sheet material is supplied to the blanking press 120 having the configuration described above, as the plate material moves from the front surface to the rear surface of the blanking mold 124, the shape of the tag is added to cut the plate material to have the shape of the tag.

That is, as shown in FIG. 5, when the sheet material is supplied to the blanking mold 124 and the blanking punch 126 is lowered to the blanking mold 124, first, a through hole may be formed to hang the neck of the tag. In accordance with the movement of is carried out in several steps to preform the appearance of the identification tag sequentially.

As described above, the plate that has undergone the preliminary shape of the tag has a deep cut line for cutting the tag from the plate as the blanking mold 124 cuts the plate to have the shape of the tag.

At this time, in the process of cutting the sheet material in the blanking mold 124 to have an outer shape of the identification tag, a semi-finished product S in which the edge S1 of the outer identification tag is bent at a right angle is manufactured. The semi-finished product S, in which the edge S1 of the manufactured identification tag is bent at right angles, is transported to the turntable 140 by the belt conveyor unit 130 associated with the rear of the blanking mold 124 and the semi-finished product S. The scrap remaining after cutting is discharged to the outside of the blanking mold 124.

Meanwhile, the semi-finished product S manufactured in the blanking press 120 is conveyed to the turntable 140 through the belt conveyor unit 130. The turntable 140 is installed such that the lower mold 142 having the shape of a disc is rotated, and a settling groove 144 in which the semi-finished product S is placed is formed along the edge of the lower mold 142 to form a belt conveyor unit. The semi-finished product S carried through 130 is received.

That is, the semi-finished product (S) carried through the belt conveyor unit 130 is rotated in the received state in the settling groove 144 formed in the lower mold 142 of the turntable 140, at this time in the settling groove 144 When the semi-finished product S is received, the edge S1 bent at right angles outside the tag is placed upward.

As shown in FIG. 6, the first bending press 160 and the second bending press 170 are installed on the upper part of the turntable 140 where the semi-finished product S is received by the settling groove 144 and rotates. Each punch sequentially presses the edge S1 of the semi-finished product S in accordance with the rotation of the 140.

In other words, the first bending press 160 is installed on the top of the turntable 140 to press the semi-finished product (S) located in the settling groove 144 of the lower mold 142 to the edge (S1) of the semi-finished product (S). Bend inwardly. This will be described with reference to FIG.

7 is a cross-sectional view showing a first bending press of the identification tag manufacturing apparatus according to the present invention. Referring to the drawings, the first bending press 160 of the inner punch 162 and the inner punch 162 descending toward the semi-finished product (S) received in the lower mold 142 of the turntable 140. An outer punch 164 that wraps around and descends toward the semi-finished product S located in the settling groove 144 of the lower mold 142 and is positioned below the sheet 150 and seated within the settling groove 144. ) Is provided with a power supply unit 166 that provides power to move up and down.

The inner punch 162 and the outer punch 164 is installed on the upper portion of the turntable 140 so that the semi-finished product S is located at the lower portion of the inner punch 162 and the outer punch 164. It descends toward the bend so that the edge S1 of the semi-finished product S may face inward.

The inner punch 162 and the outer punch 164 is connected to a crank arm (not shown) for converting the rotational movement into a linear movement to press the edge (S1) of the semi-finished product (S). That is, the inner punch 162 and the outer punch 164 is connected to the crank arm, the crank arm is connected to the crank shaft (not shown), the crank shaft is a pulley that receives the rotational force from the drive motor (not shown) (Not shown) is connected to the pulley is rotated according to the operation of the drive motor to rotate the crank shaft and the rotation of the crank shaft is transferred to the crank arm is converted into a linear movement in which the inner punch 162 and the outer punch 164 is elevated Done.

On the other hand, the bottom of the inner punch 162 is formed with a flat surface having an area smaller than the area of the semi-finished product (S), the inner punch 162 is lowered to press the inside of the semi-finished product (S) to move the semi-finished product (S) To support it.

In addition, the outer punch 164 is installed around the inner punch 162 to raise and lower the inner punch 162 along the axis. In this way, when the outer punch 164 is lowered, the bottom surface of the outer punch 164 is lowered to the extent that the upper surface of the lower mold 142 is in contact with.

In particular, the outer punch 164 that raises and lowers the inner punch 162 is formed therein an inner diameter 164a, the inner punch 162 as shown in Figures 7 to 9 in the inner diameter 164a. Inclined surface 164b facing the axis of the cross-section.

In addition, the seating groove 144 of the lower mold 142 is provided with a sheet 150 that forms the bottom surface of the settling groove 144 so that the semi-finished product S is placed on the upper surface of the sheet 150. The seat 150 has an area equal to the flat area of the settling groove 144 and is installed to move up and down within the settling groove 144.

As such, the seat 150 installed in the settling groove 144 of the lower mold 142 is connected to the power supply unit 166 to receive power from the power supply unit 166 to move up and down within the settling groove 144. do.

The power supply unit 166 may include a protrusion 166a protruding downward from the bottom surface of the seat 150 and a rod of the hydraulic cylinder 166d having one end contacting the protrusion 166a and the other end thereof expanded and contracted. 166c is connected to one end and the other end is fixed by a hinge pin (166e) is composed of an arm 166b that one end and the other end rotates relative to the hinge pin (166e).

In addition, as shown in FIGS. 7 to 9, one end of the arm 166b is bent toward the bottom of the seat 150 to contact the protrusion 166a formed on the bottom of the seat 150.

One end of the bent arm 166b and the protrusion 166a are preferably circular so that one end of the arm 166b always comes into contact with the apex corresponding to the outermost side of the protrusion 166a. It is possible to ensure the straightness of the seat 150 to be elevated in the seat 150 is able to operate precisely.

That is, one end of the arm 166b that rotates about the hinge pin 166e rotates the arm 166b when it comes in contact with the protrusion 166a as shown in FIGS. 11A, 11B, and 11C. The portions P1, P2, and P3 that contact the protrusion 166a vary depending on the angle, but the protrusion 166a is defined as a point P of an arc perpendicular to the center, so that the seat within the settle groove 144 150 can be vertically raised and lowered to precisely operate the lifting and lowering of the seat 150.

Meanwhile, the second bending press 170 is installed at the rear of the first bending press 160 to press the semi-finished product S having the edge S1 bent inwardly through the first bending press 160 and to the edge ( S1) is brought into close contact with the upper surface of the semi-finished product S. This will be described with reference to FIG.

10 is a cross-sectional view showing a second bending press of the identification tag manufacturing apparatus according to the present invention. Referring to the drawings, the second bending press 170 is installed on the upper part of the turntable 140 located behind the first bending press 160 so that the edge S1 is formed in the first bending press 160. By pressing the semi-finished product (S) bent to bring the edge (S1) in close contact with the upper surface of the semi-finished product (S).

That is, the second bending press 170 is a punch 172 which is lowered toward the semi-finished product S located in the settling groove 144 of the lower mold 142 and a crank arm (not shown) connected to the punch 172. And a crank shaft (not shown) connected to the crank arm, a pulley (not shown) for rotating the crank shaft, and a driving motor (not shown) to place the semi-finished product S directly under the second bending press 170. When the punch 172 is lowered when the slanted bent edge (S1) is pressed against the upper surface of the semi-finished product (S).

That is, when the semi-finished product S passing through the first bending press 160 is positioned directly under the second bending press 170, the punch 172 of the second bending press 170 is placed in the lower mold 142. It is lowered into the groove 144.

At this time, the edge S1 of the semi-finished product S bent obliquely is further bent as the punch 172 descends, and the end of the edge S1 is in close contact with the upper surface of the semi-finished product S to manufacture the finished product.

Referring to the operation of the identification tag manufacturing apparatus of the present invention having the configuration as described above, first, the plate wound on the feeder 110 is supplied to the blanking press 120. In the blanking press 120, the supplied plate is cut into semi-finished products S whose edges S1 are bent at right angles, and the semi-finished products S are conveyed to the turntable 140 through the belt conveyor unit 130. .

Then, the semifinished product S transported to the turntable 140 is received and rotated in the settling groove 144 of the lower mold 142, and the semifinished product S received in the settling groove 144 is the first bending press. When positioned at 160, the first bending press 160 operates to bend the edge S1 bent at a right angle to be inclined inwardly.

That is, as shown in FIGS. 7 to 9, when the semi-finished product S is positioned directly under the first bending press 160, the inner punch 162 is first lowered into the settling groove 144 so that the sheet ( The semi-finished product (S) placed in 150 is pressed to support the motion.

In this state, the outer punch 164 is lowered to come into contact with the upper surface of the lower mold 142, and in this state, the power supply unit 166 operates to raise the seat 150 in the settling groove 144. do.

That is, when the power supply unit 166 is operated, the rod 166c of the hydraulic cylinder 166d extends downward. At this time, the other end of the arm 166b connected to the rod 166c rotates downward, and one end opposite the other end of the arm 166b rotates around the hinge pin 166e to rotate upward. .

As such, when one end of the arm 166b rotates upward, one end of the arm 166b pushes the protrusion 166a of the seat 150 upward, thereby placing the seat 150 in the recess 144. Will rise within.

When the sheet 150 rises in the settling groove 144, the semi-finished product S rises with the rise of the sheet 150. In this case, the edge S1 of the semi-finished product S bent at a right angle is raised. It is bent inclined toward the inside of the semi-finished product S while being guided to the inclined surface 164b formed in the inner diameter of the outer punch 164.

As described above, when the edge S1 of the semi-finished product S is bent inwardly, the rod 166c of the hydraulic cylinder 166d, which has been extended, is introduced into the hydraulic cylinder 166d to lower one end of the arm 166b. Will be rotated.

As such, when one end of the arm 166b is rotated downward, the seat 150, which has risen in the settling groove 144, descends so that the semi-finished product S moves away from the inner punch 162 and the outer punch 164. do.

As described above, when the seat 150 descends and the semi-finished product S returns to its original position, the inner punch 162 and the outer punch 164 are raised, and in this state, the turntable 140 rotates to make the edge S1. The semi-finished product S bent obliquely is transferred to the second bending press 170.

When the semi-finished product S is positioned directly under the second bending press 170 via the first bending press 160, the punch 172 of the second bending press 170 is placed in the lower mold 142. It is lowered into the groove 144.

At this time, the edge S1 of the semi-finished product S bent obliquely is bent in accordance with the lowering of the punch 172 so that the end of the edge S1 is in close contact with the upper surface of the semi-finished product S to manufacture the finished product. Then, the finished product manufactured through the second bending press 170 as described above is separated from the lower mold 142 of the turntable 140 and then shipped through a packaging process.

According to the identification tag manufacturing apparatus according to the present invention as described above, after bending the edge (S1) of the semi-finished product (S) through the blanking press 120 inclined inward from the first bending press 160, the second bending press 170 Because the edge of the edge (S1) is completely in contact with the upper surface of the semi-finished product (S), the defects such as the edge (S1) is bent outward or the edge (S1) down to the state does not occur, so the productivity of the identification tag Has the effect of improving.

While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. .

For example, when excessive pressure is applied from the first bending press 160 or the second bending press 170 to the seat 150 installed to elevate inside the settling groove 144 formed in the lower mold 142, the sheet ( A shock absorbing member such as a coil spring 152 may be provided at the protrusion 166a formed at the lower portion of the seat 150 so that 150 may be lifted or lowered to buffer excessive pressure.

110: feeder 112: reel
120: blanking press 122: stage
124: Blanking Mold 126: Blanking Punch
130: belt conveyor unit 140: turntable
142: lower mold 144: settle groove
150: seat 152: spring
160: first bending press 162: internal punch
164: outer punch 164a: inner diameter
164b: slope 166: power supply unit
166a: protrusion 166b: arm
166c: Rod 166d: Hydraulic Cylinder
166e: hinge pin 170: second banding press
172: Punch

Claims (5)

A feeder 110 for supplying a sheet material;
A blanking press 120 which cuts the sheet material supplied from the feeder 110 into the outer shape of the identification tag and bends the edge S1 at right angles to form a semi-finished product S;
A belt conveyor unit (130) for carrying the identification tag semi-finished product (S) manufactured by the blanking press (120);
A turntable 140 which receives and rotates the identification tag semi-finished product S carried through the belt conveyor unit 130 in the settling groove 144 formed in the lower mold 142;
A seat 150 that forms a bottom of the settling groove 144 formed in the lower mold 142 of the turntable 140, and is elevated in the settling groove 144;
Installed on one side of the turntable 140 to press the identification tag semi-finished product (S) located in the settling groove 144 of the lower mold 142 with the inner punch 162 and the outer punch 164 and the sheet 150 from the top and bottom A first bending press 160 installed to bend the edge S1 of the semi-finished product S inwardly;
A second bending press installed at the rear of the first bending press 160 to press the edge S1 bent obliquely at the first bending press 160 to closely contact the edge S1 to the upper surface of the semi-finished product S. (170); identification tag manufacturing apparatus comprising a.
The method according to claim 1,
The first bending press 160,
An inner punch 162 descending toward the identification tag semi-finished product S received at the lower mold 142 of the turntable 140;
An outer punch 164 wrapping around the inner punch 162 and descending toward the identification tag semi-finished product S positioned in the settling groove 144 of the lower mold 142;
And a power supply unit (166) installed at a lower portion of the seat (150) to provide power for raising and lowering the seat (150) in the settling groove (144).
The method according to claim 2,
The outer punch 164 is a dog tag manufacturing apparatus, characterized in that the inclined surface (164b) is formed in the inner diameter (164a) toward the axis of the inner punch (162).
The method according to claim 2,
The power supply unit 166,
A protrusion 166a protruding downward from the bottom of the sheet 150; And
One end is connected to the rod 166c of the hydraulic cylinder 166d, which is in contact with the protruding portion 166a and the other end is stretched, and the one end and the other end are fixed by the hinge pin 166e so that the one end and the other end are the hinge pins 166e. Identification tag manufacturing apparatus comprising a; arm (166b) that rotates relative to the center.
The method of claim 4,
One end of the arm 166b is bent toward the bottom surface of the sheet 150 to contact the protrusion 166a, and one end of the contact protrusion 166a and the arm 166b forms a circle. .

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