KR101614813B1

KR101614813B1 - Heat welding apparatus

Info

Publication number: KR101614813B1
Application number: KR1020150077544A
Authority: KR
Inventors: 유현
Original assignee: 유현
Priority date: 2015-04-22
Filing date: 2015-06-01
Publication date: 2016-04-22

Abstract

The present invention relates to a heat welding apparatus for film adhesion, capable of having the edge of a film material curved and wound to the front boundary of a case to be bonded for the film material and the case to be firmly bonded, when bonding a thick film material having a certain thickness or more like leather to the rear of the case. The heat welding apparatus for film adhesion comprises an edge adhesion unit composed of: a side block including a pressing part installed to be moved back and forth around a lower mold having a mounting part where a first heating means for heat welding is mounted, and bending the edge part to be compressed; and an elastic pressing means allowing the pressing part to adhere to the upper part of the boundary of the mounting part, and when the pressing part comes in contact with a lower mold, changing the height of the side block.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot-melt adhesive apparatus for adhering a film having an edge adhering unit capable of adhering an edge portion of a film material to a front edge portion of a case (HEAT WELDING APPARATUS)

The present invention relates to a method for bonding a film material and a case to a front edge of a case so that the film material and the case can be firmly adhered when a thick film material such as leather is adhered to the back surface of the case, The hot-melt heating first heating means is installed around a lower mold having a seating portion mounted thereon so as to move back and forth in a horizontal direction in a lateral direction of the seating portion, and the edge portion is fixed to the front edge portion A side block having a pressing portion for bending and pressing and a second heating means for heating; and a pressing portion for pressing the pressing portion against the lower mold such that the height of the side block is variable, To a thermal fusing device for film adhering provided with an edge adhering unit including elastic pressing means .

In recent years, premium electronic devices having a design different from that of a general printing case have been put on the market by attaching leather to the rear case of an electronic device such as a smart phone.

In order to bond the leather film to the back of the case of the leather film, an insert injection method may be used in which the leather film is inserted into the mold before the case injection, and then the leather film and the case injection are molded at once through injection molding. The thickness of the leather film, the material characteristics, and the like are liable to cause dimensional defects at the time of injection, and there are many problems in reliability after injection, resulting in poor productivity. Recently, a method of directly fusing a leather film Is used.

However, since the thickness of the leather film is thicker than that of a general PET film due to the nature of the leather, the leather film is hardly completely adhered to the back of the case. Even if the adhesion is performed, the edge of the case and the edge portion of the leather film are bonded There is a problem that the edge of the vulnerable edge falls off.

Therefore, a technique for securing the reliability of a premium case to which a leather film is applied in various electronic devices has become necessary.

As a reference, the prior art related to a hot-melt welding apparatus includes a side support such as a " heat welding machine ", registered patent No. 10-0815849 (registered on March 17, 2008) Quot; fusing device "

It is difficult to completely adhere a film material having a predetermined thickness or more like a leather film to the back surface of the case which is an injection molded body and in particular when the rim of the case is rounded toward the front side, The adhesive force between the edge portions of the case becomes very weak, and there is a problem that the film material is loosened and the adhesion is deteriorated.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems, and it is an object of the present invention to provide a method of manufacturing a semiconductor device, in which a film material having a predetermined thickness or more like a leather film is completely bonded to the back surface of a case, A first heating means for heating the first heating means, a second heating means for heating the first heating means, and a second heating means for heating the first heating means, A side block having the edge portion bent toward the front edge portion and pressed to be adhered to the front edge portion; a side block having the heat-melting second heating means; And an elastic pressing means for urging the edge portion to be in close contact with the upper portion of the frame. It is another object of the present invention to provide a heat-sealing apparatus for bonding an inferior film.

Further, the present invention is characterized in that a side block is mounted so as to secure the operational stability of the side block and the elastic pressing means and to improve the heat welding effect of the edge portion through the pressing portion, And an elastic body disposed between the lower portion of the elevating block and the upper portion of the receiving portion of the moving block to exert an elastic force in a direction opposite to the compression direction, And to provide the above-mentioned objects.

In order to accomplish the above object, a thermal fusing apparatus for film adhering having an edge adhering unit according to the present invention comprises:

And the edge of the film material is adhered to the front edge of the case when the film material is adhered to the back side of the case.

A lower mold having a film material and a seating portion on which the case is seated, and having a first heating means for heat-welding;

An upper mold provided to move up and down from the upper mold and having a front pressing part corresponding to the seating part; And

And a plurality of edge adhering units disposed along the periphery of the lower mold to adhere the edge portions of the film material seated on the seating portions to the front edge portions of the case,

The edge attaching unit

A side block provided with a pressing portion which is provided so as to be forward and backward in the horizontal direction in the lateral direction of the seat portion and which presses the edge portion to the front edge portion so as to be pressed,

And a resilient pressing means for urging the side block to be in close contact with an upper edge of the seating portion while the height of the side block is variable when the pressing portion is brought into contact with the lower mold.

In the heat-fusing apparatus for film bonding having the edge-portion bonding unit according to the present invention

Wherein the edge attaching unit includes a moving block for moving the side block back and forth,

The elastic pressing means

A lift block which is vertically slidably coupled to the moving block and is raised and lowered,

And an elastic body for elastically supporting the ascending / descending block of the ascending / descending block.

Further, in the heat-fusing apparatus for film adhering provided with the edge adhering unit according to the present invention

Wherein the moving block includes a second cylinder having an up and down plunger,

The elastic pressing means

Further comprising a connecting piece having one end connected to the lifting plunger and the other end connected to the lifting block to force the lifting block to descend,

And the elastic body is disposed between the lower portion of the elevating block and the upper portion of the receiving portion of the moving block and exerts an elastic force in a direction opposite to the compression.

In addition, in the thermal fusing apparatus for film adhering provided with the edge adhering unit according to the present invention

The upper mold

And a pressing portion pressing means which is provided to move upward and downward around the front pressing portion and presses the upper portion of the pressing portion downward.

Since the edge portion of the film material is adhered to the front edge portion of the case in a dry manner, the thermal fusing device for film bonding with the edge portion bonding unit according to the present invention can completely adhere a thick film material such as a leather film to the case The edge portion can be prevented from falling off the case due to the restoring force of the film material even though the edge of the case is rounded. By forcing the edge of the edge portion adhering unit to be close to the edge of the seat portion while the height of the pressing portion is narrowed, The edge portion of the length can be effectively folded to enhance the adhesive force of the film material.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a cross-sectional view of a case to which a film material is adhered by using a heat-sealing apparatus for adhering a film having an edge adhering unit according to the present invention.
2 is a perspective view of a thermal fusing apparatus for film adhering provided with an edge adhering unit according to the present invention.
3 is a partial perspective view of a thermal fusing device for film adhering provided with an edge adhering unit according to the present invention
FIGS. 4A, 4B, 4C and 4D are partial side views for explaining the operating state of a thermal fusing apparatus for film bonding according to the present invention. FIG.
5 is a partial plan view of a thermal fusing device for film adhering with an edge adhering unit according to the present invention.

While the present invention has been described in connection with certain exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the invention. It is to be understood, however, that the invention is not intended to be limited to the particular forms disclosed, but on the contrary, is intended to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

In the drawings, the same reference numerals are used for the same reference numerals, and in particular, the numerals of the tens and the digits of the digits, the digits of the tens, the digits of the digits and the alphabets are the same, Members referred to by reference numerals can be identified as members corresponding to these standards.

In the drawings, the components are expressed by exaggeratingly larger (or thicker) or smaller (or thinner) in size or thickness in consideration of the convenience of understanding, etc. However, It should not be.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise.

In the present application, the term " comprising " or " consisting of ", or the like, refers to the presence of a feature, a number, a step, an operation, an element, a component, But do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the contextual meaning of the related art and are to be interpreted as either ideal or overly formal in the sense of the present application Do not.

It is to be understood that the first to second aspects described in the present specification are merely referred to in order to distinguish between different components and are not limited to the order in which they are manufactured, It may not match.

In describing the heat-sealing apparatus for adhering a film with an edge adhering unit according to the present invention, when it is specified for the sake of convenience, an unstructured rough direction reference is made with reference to FIG. 2 and FIG. 5, The direction of the gravity acting on the upper side is set to the upper side and the direction of gravity acting on the lower side is defined as the lower side. .

Hereinafter, a thermal welding apparatus for adhering a film having an edge adhering unit capable of adhering an edge portion of a film material according to the present invention to a front edge of a case will be described with reference to the accompanying drawings.

As shown in FIGS. 2 to 5, when the film material F is adhered to the back side of the case C, the thermal fusing apparatus for film adhering, which has the edge adhering unit according to the present invention, The upper mold 20 and the edge adhering unit 30 so as to adhere the upper mold part F1 to the front edge part C1 of the case.

The lower mold 10 is provided at the center of the base 10A and is provided with a seating part 11 on which a film material F and a case C can be sequentially placed.

When the worker places the film material F and the case C on the seating portion 11 and takes out the case C after the completion of the bonding operation by the heating means of the lower mold 10 or the edge portion bonding unit 30 The lower mold 10 is connected to a first elevating means such as a motor or a cylinder having a pneumatically raised and lowered state under the base 10A so as to be able to move upward and downward .

The seat portion 11 has a shape corresponding to the shape of the case C to be adhered and has an open top and is provided with various protruding cores that can be inserted into a camera hole or the like of the case C, C can be fixed to the seat part 11. [

The first heating unit (not shown) such as an electric heater bar is mounted on the seating part 11 and the seating part 11 is heated according to the temperature setting of the control part so that the adhesive (F) and the case (C) to be bonded while melting the adhesive agent (adhesive such as a binder or a primer, which bonds the members when heat is applied by a hot melt method).

The upper mold 20 installed on the upper mold 10 is connected to a second elevating means such as a motor provided in the upper frame 20A or a cylinder for moving up and down in a pneumatic manner,

And a front press portion 21 corresponding to the shape of the seating portion 11 is provided at the lower portion to press and press the front face portion (inner face) of the case C seated on the seating portion 11, F) and the case C (in this case, the flat portion refers to a portion having a predetermined area excluding the rim portion, meaning all the flat surfaces rounded to the front except for the rim portion).

As one of the key points of the present invention, an edge adhering unit 30 for adhering the edge portion F1 of the film material seated on the seating portion 11 to the front edge portion C1 of the case is formed in the lower mold 10), and a plurality

The number of the side edge bonding units provided in the front, rear, left, and right directions with respect to the mounting portion 11 (as will be described below for convenience of explanation) The edge portions of the lower metal mold 10 are provided with side edge portions 30A, 30B, 30C and 30D which are provided on the side of the corner portion of the seating portion 11 of the lower mold 10, (Hereinafter, referred to as first to fourth edge portion adhesive units 30E, 30F, 30G and 30H for convenience of explanation).

Hereinafter, the first side edge bonding unit 30A will be described as an example for convenience of explanation, and the specific structure of the first side edge bonding unit 30A is applied to the other edge bonding units 30 in the same way Only the difference between the size of the side block of each of the side edge adhering units 30 and the size and shape of the side blocks of each of the corner edge adhering units 30 is different.

The first side edge adhering unit 30A includes a fixing block 31 fixed to the base 10A and equipped with a first cylinder 32 having a horizontal plunger 32a,

A moving block 33 connected to the horizontal plunger 32a and sliding forward and backward while being slidably coupled to the first cylinder 32 of the fixed block 31 in the horizontal direction,

Is brought into contact with the edge portion (F1) of the film material which is engaged with the moving block (33) and is moved back and forth horizontally in the lateral direction of the seating portion (11) And a pressing portion 35a for bending and pressing the edge portion F1 in the direction of the front edge portion C1 of the case seated on the seating portion 11. The second heating means (not shown) The side blocks 35,

When the side block 35 advances and the pressing portion 35a contacts the lower mold 10 while forcing the pressing portion 35a to be in close contact with the upper edge of the seating portion 11, And an elastic pressing means 36 for varying the height of the side block 35.

The first cylinder 32 is pneumatically pushed in and out of the horizontal plunger 32a so that the first guide groove of the moving block 33 is slidably engaged with the guide rail of the first cylinder 32, The end of the plunger 32a is engaged with the engaging portion of the moving block 33 so that the moving block 33 and the side block 35 are moved forward and backward.

On the other hand, the height of the pressing portion 35a and the upper surface of the lower mold 10 around the seating portion 11 should be the same when the pressing portion 35a bends and presses the edge portion F1, Since the length of the edge portion F1 projecting upward from the upper side of the side block 35 is short, it is difficult to adjust the height of the side block 35. Therefore, the height of the side block 35 is automatically adjusted when the side block 35 is advanced using the elastic pressing means 36, (F1).

The elastic pressing means 36 may be configured such that all the configurations of the side edge bonding units 30 including the fixing block 31 or a part of the configuration including the side blocks 35 vary in vertical height, So that the pressing portion 35a presses the edge portion F1 against the front edge portion C1.

A lift block 37 to which the side block 35 is mounted and a lifting block 37 for lifting up and down the lifting block 37. [ And includes an elastic body 38 that elastically supports.

The elevating block 37 is disposed between the moving block 33 and the side block 35. The elevating block 37 is coupled to the side block 35 on one side and the guide groove is formed on the other side, And the side block 35 is moved up and down.

The elastic member 38 elastically supports the upward and downward movements of the lifting block 37 and the side block 35 upward or downward so that the side block 35 advances and the pressing portion 35a presses the lower mold The edge portion F1 is pressed against the front edge portion C1 so as to be closely contacted with the front edge portion C1 as the pressing portion 35a is brought into close contact with the lower mold 10 while the height of the side block 35 is changed .

To this end, the lower mold 10 is provided with a downwardly curved guide sloped surface 11a at an edge portion around the mount portion 11 from the inside to the outside,

The lower end of the pressing portion 35a is provided with a downwardly curved corresponding curved surface 35b from the inner end to the outer lower surface so as to correspond to the guide sloped surface 11a.

As a first embodiment of the elastic pressing means 36, a coil spring that exerts an elastic force in a direction opposite to the compression direction may be used as the elastic body 38, and the elastic body 38 may be attached to the lift block 37 so that the corresponding curved surface 35b of the pressing portion 35a is pressed against the lower mold 10 when the side block 35 advances, The side block 35 and the lift block 37 are lifted up and the advancement is completed as the elastic body 38 is compressed by the elastic force of the elastic body 38. In this state, The block 35 is pressed downward so that the pressurizing portion 35a is pressed against the bent edge portion F1 from the upper side so as to be brought into close contact with the front edge portion C1 of the case.

However, in such a case, since the pressing of the pressing portion 35a by the elastic pressing means 36 depends only on the elastic force of the elastic body 38, the elastic force may be lowered during long-term use.

As shown in the drawing, the second embodiment of the present invention is characterized in that the moving block 33 is provided with the second cylinder 34 having the lifting plunger 34a,

The elastic pressing means 36 includes a connecting piece 39 having one end connected to the up / down plunger 34a and the other end connected to the elevating block 37 to force the elevating block 37 down,

And an elastic body 38 disposed between the lower surface of the lifting block 37 and the upper surface of the receiving portion 33a of the moving block 33 so as to achieve the above displacement and pressure.

That is, the second cylinder 34 is fixedly coupled to one surface of the moving block 33 and is provided with a guide rail formed in a direction perpendicular to one side surface thereof,

The connecting piece 39 is engaged with a connecting block having a guide groove slidably engaged with the guide rail and a latching portion having an end of the lifting plunger 34a engaged with the connecting block 39. The connecting block 39 is lowered by the second cylinder 34, (37) is lowered.

The second cylinder 34 is used to pivotally move up and down the plunger 34a in a pneumatic manner. More preferably, the second cylinder 34 is connected to air suction means (not shown) Force it.

The lower end and the upper end of the elastic body 38 are disposed so as to contact the lower face of the lift block 37 and the upper face of the receiving portion 33a of the moving block 33 , And the lift block 27 is elastically supported in the upward direction.

Accordingly, when the second cylinder 34 is operated to be sucked and operated, the lifting plunger 34a is retracted and the pressing bolt 39a provided at one end of the connecting piece 39 presses the upper surface of the lifting block 37 , The elastic body 38 is compressed.

In this state, when the side block 35 advances and the pressing portion 35a contacts the lower mold 10, the advancing pressure of the side block 35 is higher than the attracting force of the second cylinder 34, As the plunger 34a is forcibly lifted, the connecting piece 39 rises,

The elevation block 37 is raised by the elastic force of the elastic body 38 by the height at which the pressure bolt 39a is spaced apart from the elevation block 37 and the height of the side block 35 is varied, The pressing portion 35a presses the bent edge portion F1 with a strong force from the upper side so that the pressing portion 35a is brought into close contact with the front edge portion C1 .

The first embodiment is disadvantageous in that the structure of the edge portion bonding unit 30 is simplified and the manufacturing is easy while the pressing force of the pressing portion 35a is weak and the adhesive force of the edge portion F1 may be lowered, Since the pressing force of the pressing portion 35a is determined according to the attraction force of the second cylinder 34 while the configuration of the embodiment is complicated, not only the edge portion F1 can be more firmly adhered, It is more preferable to select the pressing force in consideration of the length and disadvantages according to the specification of the case C, the specifications of the heat-sealing apparatus, and the like.

In the meantime, according to the present invention, the pressing means 22 installed to move upward and downward around the front crimp portion 21 of the upper mold 20 is introduced, and the pressing portion 35a of the edge portion bonding unit 30 Thereby reinforcing the adhesion enhancement of the edge portion F1.

The pressing means 22 is connected to the upper mold 20 along with the elevating means such as a separate cylinder along the periphery of the front crimping portion 21 so as to be raised and lowered and the mounting position corresponds to the upper surface of the side block 35 So that the lower surface of the presser 35a is pressed against the lower surface of the presser 35a.

Therefore, the present invention is characterized in that the elastic pressing means 36 and the pressing means 22 force the edge portion F1 to adhere to the front edge portion C1 in close contact with each other, The film material F of a thick material such as a leather film is firmly adhered to the case C by firmly adhering the film material F1 to the inside of the rim of the case C, It is possible to prevent peeling.

Hereinafter, the function and effect of the heat-seal apparatus for film adhering having the above-described structure will be described.

Although not shown in the drawings, when the thermal fusing device for film bonding is operated, vacuum pressure is applied to the second cylinder 34 of each edge adhering unit 30 so that the lift block 37 and the side block 35 are lowered The first and second heating means heat the mounting portion 11 and the pressing portion 35a to a predetermined temperature in a state in which the lower mold 10 is raised to a middle height between the upper mold 20 and the upper mold 20. [ Preheated.

4A to 4D, the worker stacks the film material F and the case C sequentially on the seat part 11, places the seat part C on the seat part C, and then turns on the operation button (not shown) The lower mold 10 is lowered to a height of the edge adhering unit 30 and then the upper mold 20 is lowered to press the film material F and the case C between the molds.

When the upper mold 20 is lowered, the first cylinder 32 of the first to fourth side edge adhesion units 30A, 30B, 30C and 30D is operated so that each side block 35 advances, The height of the side block 35 and the elevating block 37 is increased and the pressing portion 35a is advanced to the edge portion exposed to the outside of the mounting portion 11 F1) and the edge portion F1 is curled inwardly toward the inside of the front edge portion C1 to complete the advancement.

When the advancement is completed, the pressing portion 35a is forced to be lowered by the vacuum pressure of the second cylinder 34, so that the pressing portion 35a is prevented from being lifted or raised by the restoring force of the edge portion F1 .

The pressing portions 35a are pressed against the upper surface of the pressing portion 35a by the operation of the pressing means 22 so that the pressing portion 35a presses the pressing portion 35a, And is pressed onto the front edge portion C1.

Therefore, when the pressing of the upper mold 20 and the side edge edge adhering units 30A, 30B, 30C and 30D is continued for a predetermined time, the flat portion of the film material F and the edge portions F1 are firstly bonded.

The first cylinder 32 of each of the side edge edge adhering units 30A, 30B, 30C and 30D is operated in the backward direction so that the respective side blocks are moved backward, Return to the position.

Subsequently, when the first cylinder 32 of each of the corner portion edge adhering units 30E, 30F, 30G and 30H advances and each of the side blocks advances and then the pressing means 22 descends again, The remaining part of the edge portion F1 which is not bonded in the same manner as the edge portion bonding units 30A, 30B, 30C and 30D is pressed and bonded.

At this time, the pressing means 22 is configured such that each of the mill pins 23 is individually operated for the side edge bonding units 30A, 30B, 30C and 30D and the corner edge bonding units 30E, 30F, 30G and 30H However, it is more preferable that all of the mill pins are simultaneously operated by one cylinder for the convenience of manufacturing the heat fusing apparatus.

In this case, the side edge bonding units 30A, 30B, 30C and 30D and the corner edge edge bonding units 30E, 30F, 30G and 30H are arranged in such a manner as to prevent mutual interference between the side blocks 35 The respective edge adhering units 30 arranged at the opposed positions can be controlled to be sequentially operated.

That is, for example, first and second side edge bonding units 30A and 30B are operated first, then the third and fourth side edge bonding units 30C and 30D are operated, After the second corner edge bonding units 30E and 30F are operated, finally, the third and fourth corner edge adhesion units 30G and 30H are controllable to operate.

It is also possible that the order of operation of the side edge adhering units 30A, 30B, 30C and 30D and the corner edge adhering units 30E, 30F, 30G and 30H is reversed, 30 can be selected and adjusted by the user in accordance with the specifications of the case C and the like.

A side block for pressing the edge portion F1 with a height varying through the elastic pressing means 36 and a spring pin for pressing the upper portion of the pressing portion 35a through the lowering of the pressing means 22 The edge portion F1 of the film material such as a thick leather film can be adhered to the inside of the front edge portion C1 of the case as if it is curled. The adhesion between the film material F and the case C becomes stronger and the peeling of the film material F is more reliably prevented even when the edge of the case C is rounded toward the front side There is an effect that can be.

In the above description, conventionally known techniques related to the control method, heating means, and the like of each of the mold and the edge adhering unit by the microcomputer (control unit) are omitted, but those skilled in the art can easily guess and deduce it.

While the present invention has been described with reference to the accompanying drawings, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. Changes and substitutions are to be construed as falling within the scope of protection of the present invention.

C: Case C1: Front edge portion
F: Film material F1: Edge portion
10: lower mold 11: seat part
20: upper mold 21: front crimping portion
22: pressing means 23:
30: Edge adhering unit
30A, 30B, 30C, 30D: side edge adhesive units
30E, 30F, 30G, 30H: corner edge edge adhering unit
31: fixed block 32: first cylinder
32a: Horizontal direction plunger 33: Moving block
33a: receiving portion 34: second cylinder
34a: lifting plunger 35: side block
35a: pressing portion 36: elastic pressing means
37: Lift block 38: Elastic body
39: Connection

Claims

And the edge of the film material is adhered to the front edge of the case when the film material is adhered to the back side of the case.
A lower mold having a film material and a seating portion on which the case is seated, and having a first heating means for heat-welding;
An upper mold provided to move up and down from the upper mold and having a front pressing part corresponding to the seating part; And
And a plurality of edge adhering units disposed along the periphery of the lower mold to adhere the edge portions of the film material seated on the seating portions to the front edge portions of the case,
The edge attaching unit
A side block provided with a pressing portion which is provided so as to be forward and backward in the horizontal direction in the lateral direction of the seat portion and which presses the edge portion to the front edge portion so as to be pressed,
And a resilient pressing means for urging the side block to be in close contact with an upper edge of the seating portion while the height of the side block is varied when the pressing portion contacts the lower mold.

The method according to claim 1,
Wherein the edge attaching unit includes a moving block for moving the side block back and forth,
The elastic pressing means
A lift block which is vertically slidably coupled to the moving block and is raised and lowered,
And an elastic body for elastically supporting the ascending / descending block of the ascending / descending block.

3. The method of claim 2,
Wherein the moving block includes a second cylinder having an up and down plunger,
The elastic pressing means
Further comprising a connecting piece having one end connected to the lifting plunger and the other end connected to the lifting block to force the lifting block to descend,
Wherein the elastic body is disposed between the lower surface of the lift block and the upper surface of the receiving portion of the moving block, and exerts an elastic force in a direction opposite to the compression.

4. The method according to any one of claims 1 to 3,
The upper mold
And pressing means pressing means for pressing the upper portion of the pressing portion upward and downward so as to move up and down around the front pressing portion.