JP2001301042A - Weather strips and mold and method for connecting the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mold and a method for connecting weather strips at a low cost with high performance. SOLUTION: In a method for connecting the first and second end parts W1, W2 of the weather strips by a sheet piece 20 comprising unvulcanized rubber or a thermoplastic elastomer, the sheet piece 20 molded into the almost same shape as the end surface W1a of the first end part W1 is preliminarily bonded to the end surface W1a of the first end W1, and this end W1 is held to a first mold 31 and the second end W2 is held to a second mold 32. Subsequently, the first and second molds 31, 32 are combined and the sheet piece 20 is heated to connect the first and second ends W1, W2 at a position shifted from the contact surface 33 of both molds 31, 32.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a weather strip used for sealing an opening of a door or a trunk of an automobile, and more particularly, to connecting the ends of the weather strip. Mold for connection,
The present invention relates to a method for connecting the ends of such a weather strip and a weather strip connected by the method.

[0002]

2. Description of the Related Art A weather strip seals a gap formed between a door edge and a vehicle body opening edge when an automobile opening is closed. And a mounting base that is mounted on the opening portion or the vehicle body opening edge, and a seal portion that performs the above-described sealing function. Since such a weather strip is generally manufactured by extrusion molding, it is necessary to connect the ends of the weather strip at at least one place or more in order to seal the opening over the entire circumference. For example, extruded 1
In some cases, both ends of a weather strip are connected to form a circumferential shape, or alternatively, ends of a plurality of extruded weather strips are connected to each other to form a circumferential shape.

Conventionally, an injection molding method is generally used as a method for connecting such a weather strip. In the injection molding method, the ends of the weather strip to be connected are arranged opposite to each other in a mold, and unvulcanized rubber is injected or press-fitted into a space in the mold to vulcanize the ends. Are connected by a molded part.

[0004] However, in the case of connection by the injection molding method, there is a problem that capital investment accompanying the introduction of the injection machine is large, and therefore the production cost is increased.

[0005] Further, in the weather strip, the seal portion may be formed in a hollow shape in order to impart appropriate elasticity and sufficient sealability to the seal portion. When a weather strip having such a hollow seal portion is connected by the above-described injection molding method, it is necessary to use a core in order to provide a hollow portion in a molded portion formed by injection molding. Such a core is attached in a state where it is inserted into the hollow seal portions at both ends of the opposed weather strip, set in a mold in that state, and removed from the hollow seal portion after injection molding. Therefore, a complicated process of attaching and detaching the core is required, and a hole for inserting and removing the core in the hollow seal portion needs to be provided, so that the production cost is further increased. is there.

In order to solve the problem of the connection method by injection molding, there is a method of connecting the two ends of the weather strip at low cost by using an unvulcanized rubber sheet.

FIG. 13 is a perspective view showing a conventional connection method using an unvulcanized rubber sheet. In this method, two ends 101, 102 of an extruded weather strip are used.
Is held in the molds 103 and 104 which are divided into right and left. Then, a rectangular unvulcanized rubber sheet 105 that is sufficiently larger than the cross-sectional shape of the weather strip is attached to the contact surface 103a of one mold 103, and both molds 10
By pressing the rubber sheets 105 by pressing the rubber sheets 3 and 104, both ends 101 and 102 are connected.

However, this connection method has a problem in that burrs are generated on the entire outer periphery of the weather strip after vulcanization, so that the number of steps for cutting the burrs is large. In addition, if the burr cutting operation is performed improperly, the performance of the weather strip may not be sufficiently ensured, for example, water leakage may occur from that portion.

The present invention has been made in view of the above points, and provides a weatherstrip connection mold and a connection method capable of connecting a weatherstrip at low cost and high performance. The purpose is to:

[0010]

According to the present invention, there is provided a weather strip connecting mold according to the present invention, comprising a first end portion of a weather strip and a second end portion.
An end portion, a weather strip connection mold for connecting the end surfaces of each other to face each other, and connecting them by a sheet piece made of unvulcanized rubber or thermoplastic elastomer interposed therebetween, wherein A first mold that holds one end, and a second mold that holds the second end, the two molds having a contact surface that abuts each other when combined, and the first mold has:
The first mold is configured to hold the first end so that the tip of the first end does not reach the contact surface.
The second end is held so that the tip of the second end protrudes outward from the contact surface, and the first mold and the second mold are combined with the first mold. The connection position between the end portion and the second end portion is located at a position shifted from the contact surface of both molds toward the first mold.

The method for connecting a weather strip according to the present invention comprises:
A first end portion and a second end portion of the weather strip are arranged with their end faces facing each other, and are connected by a sheet piece made of unvulcanized rubber or thermoplastic elastomer interposed therebetween. In the connection method, using the connection mold, the sheet piece molded in substantially the same shape as the end face is disposed on the end face of the first end or the second end, and By holding an end portion in the first mold, holding the second end in the second mold, and then combining the first mold and the second mold, heating the sheet piece, The first end and the second end are connected at a position shifted from the contact surface of both dies.

Here, the first end and the second end may be both ends of one weather strip or ends to be connected of different weather strips.

According to the present invention, since the ends of the weather strip are connected to each other using a sheet made of unvulcanized rubber or a thermoplastic elastomer, the manufacturing cost can be reduced as compared with the connection method by injection molding. it can. In addition, since the sheet for such connection is formed in advance in substantially the same shape as the end face of the weather strip, burrs protruding to the outer periphery of the weather strip can be extremely reduced.
In particular, since the connection position of both ends is set to a position deviated from the contact surface between the first mold and the second mold, that is, a position different from the division position of the mold, the outer periphery of the weather strip is formed. Burrs can be prevented from occurring over the entire circumference.
Therefore, the man-hour for cutting off the burrs after bonding is small,
Further, the performance of the weather strip such as the appearance of the connection portion and the sealing performance is also excellent.

In the above-described method for connecting a weather strip, it is preferable that the sheet piece is previously attached to an end face of the weather strip, and the end face to which the sheet piece is attached is held in a first mold. It is preferably the end face of the first end.

According to the present invention, two ends of the weather strip to be connected are connected to each other by a sheet piece made of unvulcanized rubber or a thermoplastic elastomer interposed therebetween, with the end faces facing each other. Using a punch having a punching hole for punching a sheet made of unvulcanized rubber or a thermoplastic elastomer into substantially the same shape as the end face of the weather strip, and pressing the punch against the sheet. In this pressed state, one end of the weather strip is inserted into the punched hole of the punch, and the punched sheet piece is attached to the end face of the end, and then the sheet piece is attached. The other end of the weather strip is brought into contact with the end of the sheet, and the sheet is heated to connect one end to the other end. On how to connect that weather strip.

In the second method, the end of the weather strip is pushed into the punch with the punch pressed against the sheet, so that the punched sheet piece present inside the punch hole is weathered. Affixed to the end face of the strip. Therefore, it is possible to easily attach the bonding sheet pieces having substantially the same shape to the end surfaces of the weather strip without displacing. That is, when a sheet piece cut out in a predetermined shape is prepared in advance and the sheet piece is manually attached to the end of the weather strip, it is difficult to adjust the position of the attachment. No special positioning is required, and it can be easily attached without displacement.

In the second method, the above-described connection mold can be used. In this case, one end of the sheet with the sheet piece is attached to one of the first mold and the second mold. While holding in one mold, the other end is held in the other mold, and then the first mold and the second mold are combined, and by heating the sheet piece, the one end and The other end is connected at a position shifted from the contact surface of both molds. Further, in this case, it is preferable that one end to which the sheet piece is attached is held by the first mold and the other end is held by the second mold.

[0018]

Embodiments of the present invention will be described below with reference to the drawings.

The weather strip W in the embodiment is
This seals the vehicle body opening in the trunk of the automobile, and as shown in FIG. 2, a mounting base 12 having a substantially inverted U-shaped cross section, which is mounted on a body flange 2 provided on the vehicle body opening edge 1. A hollow seal portion 14 having a substantially circular cross section which swells from the top of the mounting base 12 and abuts on the door edge 3.
And Here, the mounting base 12 is made of solid rubber, and the hollow seal part 14 is made of sponge rubber.
An insert metal 16 is embedded in the mounting base 12, and a plurality of holding lips 18 for holding the body flange 2 are provided inside the mounting base 12.

The weather strip W is extruded into the above-mentioned cross-sectional shape by extrusion molding, and both end portions W of the extruded product are extruded.
1 and W2 are connected by a sheet piece 20 made of unvulcanized rubber or a thermoplastic elastomer as shown in FIG. 8, thereby forming a circumferential shape so as to seal the opening edge 1 of the vehicle body over the entire circumference. It is. Both ends W to be connected
The end faces W1a and W2a of W1 and W2 have the same shape.

Hereinafter, a method of connecting the weather strip W according to the first embodiment will be described.

(1) First, as shown in FIG. 3, a sheet piece 20 formed in substantially the same shape as the end face W1a is attached to an end face W1a of a first end W1, which is one end of the extruded product. . That is, the sheet piece 20 is previously attached to the mounting base 21 and the hollow seal 2 corresponding to the end face W1a of the first end W1.
2 and a holding lip 23, and the sheet pieces 20 are superposed and attached in a state where they are aligned with the end face W1a of the first end W1.

As a constituent material of the sheet piece 20, a material having good adhesiveness with the material of the weather strip to be connected is selected, and it is preferable that the material is the same. Specifically, examples of the unvulcanized rubber include polychloroprene rubber and ethylene propylene rubber, and examples of the thermoplastic elastomer include a polypropylene / vulcanized rubber dispersed thermoplastic elastomer.

The method for forming the sheet piece 20 into a shape corresponding to the end face W1a is not particularly limited.
The sheet having a predetermined thickness can be formed by punching with a punch or by injection molding. Sheet piece 2
The thickness of 0 is preferably 0.5 to 2.5 mm.

In the present embodiment, the holding lip 23 is also provided on the sheet piece 20, but it is not necessary to set the same shape to the holding lip 18 which is hard to be seen from the outside. That is, the sheet piece 20 may be formed in a shape corresponding to the outer shape of the weather strip W. Further, when the sheet piece 20 is attached to the end face W1a, the rod having been heated to a flow temperature of the sheet constituent material or higher is hollowed after leaving the hole of the hollow seal portion 22 in a shape without opening. A hole may be formed by pushing the hole into a position corresponding to the part.

The sheet piece 20 is moved to the end face W1a of the first end W1.
The method of attaching to the first end portion W is not particularly limited.
A method in which the end face W1a is pressed against the sheet piece 20 while heating 1 is preferable.

(2) Next, the connection mold 30 shown in FIG.
Then, the first end W1 and the second end W2 connected to the first end W1 are held.

Here, the connection mold 30 is connected to the first end W1.
And a second mold 31 for holding the second end W2.
A mold 32 is provided, and both molds 31, 32 are divided into right and left. Then, the first mold 31 and the second mold 32
Are the lower dies 31A and 32A and the upper dies 31B and 32B that respectively shape the outer shape of the weather strip W, and the mounting base 1
Intermediate molds 31C and 32C which are nested molds that shape the inside of 2
Therefore, the mold 30 is configured to be vertically divided into three and vertically divided into two.

The first mold 31 and the second mold 32 have an abutting surface 33 which abuts each other when combined. That is, the contact surface 33 is a left and right division position of the mold 30. The contact surface 33 is, specifically, a lower mold 31A of the first mold 31.
And the upper mold 31B, and the lower mold 32A and the upper mold 3 of the second mold 32.
This is the contact surface with 2B. The contact surface 34 between the intermediate mold 31C of the first mold 31 and the intermediate mold 32C of the second mold 32 is not on the same plane as the contact surface 33, which is the dividing position of the mold 30, and the first mold It is set at a position shifted within 31.

The mold 30 has a first end W1 and a second end W
2 is held as follows.

First, both ends W1 and W2 are assembled to the intermediate dies 31C and 32C, respectively. More specifically, as shown in FIG. 5A, the intermediate mold 31C is fitted inside the mounting base 12 of the first end W1. At this time, the end face W1 of the first end W1
The sheet piece 20 attached to a is attached so that the contact piece 34 of the intermediate mold 31C substantially coincides with the contact piece 34. FIG.
As shown in (b), the intermediate mold 32C is fitted inside the mounting base 12 at the second end W2. At this time, the mounting is performed so that the end face W2a of the second end W2 substantially coincides with the contact face 34 of the intermediate mold 32C.

Next, as shown in FIG. 6 (a), the intermediate mold 31C with the first end W1 assembled is stacked on the lower mold 31A, and the upper mold 31B is further stacked thereon.
Combine. 6 (a) and FIG.
As shown in (a), in the first die 31, the end surface W1a of the first end W1 does not reach the contact surface 33, and the end surface W1
a such that the first end W1 is located inside the first mold 31.
Hold.

As shown in FIG. 6 (b), the intermediate mold 32C with the second end W2 is assembled on the lower mold 32A, and the upper mold 32B is further superimposed thereon. Combine. As a result, as shown in FIG.
The second mold 32 is configured such that the end face W2a of the second end W2 projects outside the second mold 32 beyond the contact surface 33.
Hold the end W2.

(3) First mold 3 holding first end W1
1 and the second mold 32 holding the second end W2 are shown in FIG.
As shown in (2), the sheet pieces 20 are heat-treated by combining the contact surfaces 33 so as to overlap each other.

By combining the two dies 31, 32, the first end W1 and the second end W2
Are held in a state where they are matched. In addition, the abutted position is the contact surface 34 between the intermediate molds 31C and 32C.
, The connection position of both ends W1 and W2 is shifted from the contact surface 33 between the first die 31 and the second die 32. The end face W2a of the second end W2
Are tightly adhered to the sheet piece 20 adhered to the end face W1a of the first end W1 so that both ends W are closed after the mold is closed.
1 and W2 may be pushed into the molds 31 and 32, respectively.

When the sheet piece 20 is made of unvulcanized rubber,
The sheet piece 20 adheres both end faces W1a and W2a simultaneously with vulcanization by a heat treatment. Therefore, the weather strip W is connected by maintaining the heated state at least for the time required for vulcanization.

On the other hand, when the sheet piece 20 is made of a thermoplastic elastomer, the sheet piece 20 is melted by the heat treatment, and further cooled and solidified, so that both end faces W are formed.
1a and W2a are bonded. Therefore, in this case, the weather strip W is connected by cooling the mold 30 after the heat treatment.

In the heat treatment, the mold 30 may be pre-heated, or both ends W1 and W2 may be
After setting to 0, you may heat. Further, it is not necessary to heat the entire mold 30, and only the vicinity of the disposition position of the sheet piece 20 may be heated.

(4) After that, when the mold 30 is opened and the product is taken out, as shown in FIG. 8, the weather in which the first end W1 and the second end W2 are connected with the sheet piece 20 interposed therebetween. A strip W is obtained.

In the weather strip W thus connected, since the sheet piece 20 used for connection is formed in advance into a shape substantially the same as the product shape of the weather strip W, it protrudes to the outer periphery of the weather strip W. Very little burr.

Moreover, not only is the sheet piece 20 preliminarily formed into a product shape, but also the connection positions of both ends W1 and W2 using the sheet piece 20 are determined by the first mold 31 and the second mold 32. Since it is displaced from the contact surface 33, no burrs are generated on the entire outer periphery of the weather strip W. That is, when the connection position is set on the same plane as the contact surface 33 of the mold 30, even if the sheet piece 20 is previously formed into a product shape, the sheet material is in contact with the contact surface 3.
As shown in FIG. 14A, burrs 40 are generated all around the outer periphery of the weather strip W as shown in FIG. On the other hand, by shifting the connection position as described above, burrs 41 extending in the longitudinal direction of the weather strip W are generated as shown in FIG.
Burrs do not occur over the entire circumference. Such burrs extending in the longitudinal direction also occur in the case of FIG. 14A where the connection position is not shifted.

According to the above-described embodiment, the thin sheet 2 made of unvulcanized rubber or thermoplastic elastomer is used.
Since the end portions W1 and W2 of the weather strip W are connected to each other using 0, the manufacturing cost can be reduced as compared with the connection method by injection molding.

Further, since the burrs generated on the outer periphery of the weather strip W by the connection are very small, the number of steps of cutting off the burrs after the connection is small, and the appearance of the connection portion is good. In addition, since a deburring operation that may impair the sealing performance is small, the performance of the weather strip is also excellent.

Next, a method of connecting the weather strip W according to the second embodiment will be described. In the second embodiment, the end face W of the first end W1 in the step (1) is used.
The method of attaching the sheet piece 20 to 1a is different from that of the first embodiment. The other steps (2) to (4), which are the same as in the first embodiment, are not described here.

In this embodiment, first, as shown in FIG. 9A, a sheet 52 made of unvulcanized rubber or thermoplastic elastomer is placed on a flat table 50, and a punch 54 as a punching tool is attached to the sheet 52. Press it up. Punch 54
Has a punching hole 56 for punching the sheet 52 into substantially the same shape as the end face W1a of the first end W1. The punched hole 56 is formed by a pressing surface 54 of the punch 54 against the sheet 52.
a through hole penetrating from the side a to the opposite pressing surface 54b in substantially the same shape as the end face W1a, so that the first end W1 can be inserted from the counter pressing surface 54b. As shown in FIG. 10, a blade 58 is projected from the pressing surface 54 a of the punch 54 so as to surround the punched hole 56.
8, the sheet 52 is cut, and the sheet piece 20 cut inside is obtained.

The material of the base 50 is hard rubber,
Resins, metals, woods and the like can be mentioned, but it is preferable that the unvulcanized rubber sheet does not stick easily and has a hardness enough to enable punching with a punch.

The first end W shown in FIG.
In the punch 54 provided with the punched hole 56 along the outer shape of No. 1, the punched sheet piece 20 does not become hollow at a portion corresponding to the hollow seal portion 14 of the weather strip, so the hollow seal portion is not provided near the connection portion as it is. 14 is less likely to be deformed. Therefore, as shown in FIG. 11, it is preferable to form a hollow portion in the seal piece 20 using the second punch 60. That is, the second punch 60 is inserted into a portion corresponding to the hollow seal portion 14 in the punched hole 56 of the punch 54,
With the punch 54 pressed against the sheet 52, the second
The punch 60 is inserted into the punching hole 56 and pressed against the punched sheet piece 20, thereby forming the sheet piece 2.
A hole can be formed in the hollow seal portion 22 of the zero. As described above, after attaching the sheet piece 20 to the first end W1, the heated rod may be pushed in to make a hole.

Next, as shown in FIG. 9B, with the punch 54 pressed against the sheet 52, the first end W1 is inserted into the punched hole 56 of the punch 54, and the end face W1
a is pressed against the punched sheet piece 20 existing inside the punching hole 56. Thereafter, as shown in FIG. 9C, the first end W1a is pulled out from the punch 54. Then, the sheet piece 20 punched by the punch 54 adheres to the end face W1a of the first end W1. Therefore, the sheet piece 20 having substantially the same shape as the end face W1a is attached to the end face W1a of the first end W1.

When the first end portion W1 is inserted into the punch 54, the first end portion W1 is pre-warmed (for example, 60 to 80 ° C.) so that the sheet piece 20 can be easily attached. it can. Also, the end face W1 of the first end W1
An adhesive may be applied to a.

According to the connection method of the second embodiment, by pressing the weather strip end W1 into the punch 54 while the punch 54 is pressed against the sheet 52, the sheet piece 20 is connected to the weather strip. Since it can be attached to the end face W1a, the bonding sheet piece 20 formed into a product shape can be easily attached to the weather strip end W1 without being displaced.

FIG. 12 shows a modified example of the punch 54. In this example, the punch 54 is not provided with the blade 58, but is instead provided on the upper surface of the base 50.
The protrusion 62 is provided to be inserted into the punched hole 56 of the first embodiment. That is, the protrusion 62 is formed by the end face W1a of the first end W1.
When the punch 54 is pressed onto the table 50 with the sheet 52 interposed therebetween, the protrusion 62
Penetrates into the punched hole 56 and the sheet 52 is cut into a product shape.

In the above embodiment, the case where both ends of one weather strip having a constant cross-sectional shape are connected has been described. However, the present invention is not limited to this case, and the cross-sectional shape is not limited to this case. The present invention can also be applied to a case where the ends of the same two weather strips are connected to each other. Basically, even if the end faces to be connected have substantially the same shape, even if the weather strips have basically different cross-sectional shapes, the present invention can be similarly connected well.

[0053]

As described above, according to the present invention,
The weather strip can be connected at a low cost, and the connected weather strip has very little burrs, so that the number of man-hours for deburring is small and the performance (appearance, sealing performance) is excellent. .

[Brief description of the drawings]

FIG. 1 is a perspective view when a weather strip according to a first embodiment of the present invention is connected.

FIG. 2 is a cross-sectional view showing a state in which the weather strip of the embodiment is mounted on a vehicle.

FIG. 3 is a perspective view showing a state in which a sheet piece is attached to a first end of the weather strip.

FIG. 4 is a perspective view of a connection mold used in the connection method of the embodiment.

FIG. 5A is a perspective view showing a state in which a first end is assembled to an intermediate mold, and FIG. 5B is a perspective view showing a state in which a second end is assembled to an intermediate mold.

FIG. 6A is a perspective view illustrating a state where a first end is assembled to an intermediate mold and a lower mold, and FIG. 6B is a perspective view illustrating a state where the second end is assembled to an intermediate mold and a lower mold. FIG.

FIG. 7A is a perspective view showing a state in which a first end is held in a first mold, and FIG. 7B is a perspective view showing a state in which a second end is held in a second mold. FIG.

FIG. 8 is a perspective view of the connected weather strip.

FIGS. 9A and 9B are diagrams showing the second embodiment, in which FIG. 9A is a perspective view showing a state in which a punch is pressed against a sheet, and FIG.
FIG. 4 is a perspective view showing a state where a first end is inserted into the punch, and FIG. 4C is a perspective view showing a state where the first end is pulled out from the punch.

FIG. 10 is a side view at the time of punching a sheet according to the second embodiment.

FIG. 11 is a side view according to a modified example at the time of sheet punching in the second embodiment.

FIG. 12A is a side view according to still another modification at the time of punching a sheet according to the second embodiment, and FIG.
Is a perspective view thereof.

FIG. 13 is a perspective view of a connection portion according to a conventional weather strip connection method.

FIGS. 14A and 14B are cross-sectional views showing burrs generated at a connection portion of a weather strip.

[Explanation of symbols]

 W ... Weather strip W1 ... First end W1a ... End face W2 ... Second end W2a ... End face 20 ... Sheet piece 30 ... Mold 31 ... First mold 32 ... Second mold 33: Contact surface of first and second molds 52: Sheet 54: Punch 56: Punch hole

Continued on the front page F term (reference) 3D024 AA06 AA17 AB04 AB18 AB57 4F211 AA45 AD05 AD12 AG14 AG16 AH23 AM33 TA09 TC11 TD07 TH18 TJ14 TJ22 TJ29 TN84 TN87 TQ01

Claims (7)

[Claims] 1. A first end portion and a second end portion of a weather strip are connected to each other by a sheet piece made of unvulcanized rubber or a thermoplastic elastomer interposed between the first end portion and the second end portion. A first mold for holding the first end and a second mold for holding the second end, and the two molds are combined to make contact with each other. The first mold holds the first end so that the tip of the first end does not reach the contact surface, and the second mold has Holding the second end so that the tip of the second end protrudes outward from the abutment surface. In a state where the first mold and the second mold are combined, the second mold is used. The connection position between the first end and the second end is shifted from the contact surface of both molds toward the first mold. A weather strip connection mold characterized by the following. 2. A first end portion and a second end portion of a weather strip are connected to each other by a sheet piece made of unvulcanized rubber or a thermoplastic elastomer interposed therebetween, with their end faces facing each other. A method of connecting a weather strip, wherein the sheet piece is formed on the end face of the first end or the second end to have substantially the same shape as the end face, using the connection mold according to claim 1. , The first end is connected to the first end.
While holding the second end portion in the second mold, and then combining the first mold and the second mold, and heating the sheet piece, the first end portion and A method for connecting a weather strip, wherein the second end is connected to a position shifted from the contact surface of both molds. 3. The sheet piece molded in substantially the same shape as the end face is attached to the end face of the first end in advance, and thereafter,
The method according to claim 2, wherein the first end is held by the first mold. 4. A weather for connecting two ends of a weather strip to be connected, with their end faces facing each other and a sheet of unvulcanized rubber or thermoplastic elastomer interposed therebetween. A method of connecting strips, wherein the punch is pressed against the sheet using a punch having a punching hole for punching a sheet made of unvulcanized rubber or thermoplastic elastomer into substantially the same shape as the end face of the weather strip. In the pressed state, one end of the weather strip is inserted into the punched hole of the punch, and a punched sheet piece is attached to the end face of the end. The other end of the weather strip is abutted, and the sheet piece is heated to connect one end to the other end. How to connect up. 5. The connecting die according to claim 1, wherein said one end having said sheet piece attached thereto is held by either one of said first die and said second die. The other end is held by the other mold, and then, the first mold and the second mold are combined, and the sheet piece is heated to thereby form the one end and the other end. 5. The method for connecting a weather strip according to claim 4, wherein the first and second molds are connected at positions shifted from the contact surfaces. 6. The wafer according to claim 5, wherein said one end to which said sheet piece is attached is held by said first mold, and said other end is held by said second mold. How to connect the strip. 7. A weatherstrip connected by the connection method according to any one of claims 2 to 6.