TW201838795A - Belt joining device - Google Patents

Abstract

A belt joining device is provided which can easily join a belt even in a narrow place. This belt joining device 10A is provided with a holding body 12 which holds both a first belt end 16 and a second belt end 18 together, and a pressing body 14 which presses both ends in the thickness direction, wherein the holding body 12 comprises a lower mold 22 on the top surface of which the first belt end 16 and the second belt end 18 are placed, an upper mold 20 which is arranged on the top surface of the first belt end 16 and the second belt end 18, a belt clamp 26, at least one clamp body 24 which clamps the first belt end 16 or the second belt end 18 therebetween and to which the belt clamp 26 is detachably fixed, and a heater which heats the first belt end 16 and the second belt end 18. A belt pulling mechanism is provided between the clamp body 24 and the lower mold 22.

Description

Belt joint

This invention relates to a belt engaging device and, more particularly, to a device for engaging the ends of a belt.

A mechanism for seamlessly joining a transmission and a conveyance belt using a thermoplastic plastic as a main material, and a belt engagement device in which a heater and a punch are integrated (for example, Patent Document 1). The belt engaging device sets both ends of the belt to a pair of heated punching machines, and the heated punching machine melts both ends of the belt to be integrated, and then solidifies by cooling. [Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open Publication No. 2000-141491

However, in the case of Patent Document 1, since the heater and the punch are integrated, there is a problem that the belt joining device is difficult to be miniaturized. In the field where belts are used, it is desirable to have a small belt engaging device. For example, when replacing the belt used in the conveying device of the automatic ticket cutting machine, in order to secure the working space for the belt to be tensioned, it is necessary to temporarily remove the conveying device from the automatic ticket cutting machine. In this way, after the belt is replaced, the transport device must be reinstalled to the automatic ticket cutter, so unnecessary work time is required and the work becomes complicated.

It is an object of the present invention to provide a belt engaging device that can easily engage a belt even in a narrow space.

A belt engaging device according to the present invention is a belt engaging device comprising: a holding body that abuts both end portions of the first belt end portion and the second belt end portion; and a pressing body that presses the two in the thickness direction An end portion; the holding system includes: a lower mold, the first belt end portion and the second belt end portion are placed on the upper surface; and the upper mold is placed on the first belt end portion And an upper surface of the second belt end portion; a belt clamp; at least one clamp body sandwiching the first belt end portion or the second belt end portion therebetween, and the belt clamp is detachably fixed And a heater that heats the first belt end and the second belt end; and includes a belt pulling mechanism between the clamp body and the lower mold. [Effect of the invention]

According to the present invention, a belt pulling mechanism is included between the lower mold and the clamp body, whereby the belt end portions can be butt-joined in a state where tension is applied, so that even in a narrow place, It is easy to engage the belt.

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

1. First Embodiment (All Structures) The belt joining device 10A shown in Fig. 1 includes a holding body 12 and a pressurizing body 14 so that the belt-shaped belt 13 has a seamless shape. The holding body 12 and the pressing body 14 are formed of a metal such as iron, aluminum, stainless steel, or the like, or a heat-resistant plastic. The holding body 12 is butted to hold the first belt end portion 16 and the second belt end portion 18. The pressurizing body 14 presses both end portions of the first belt end portion 16 and the second belt end portion 18 in the thickness direction. Further, in the figure, the X direction is regarded as the belt running direction, the Y direction is regarded as the belt width direction, and the Z direction is regarded as the belt thickness direction.

As shown in Fig. 2, the belt 13 includes a belt body 15 which is a thermosetting plastic, and a first joint portion 17 which is provided at a first belt end portion 16 which is one end of the belt body 15; The 2 joint portion 19 is provided at the second belt end portion 18 as the other end. The first joint portion 17 and the second joint portion 19 are formed of a thermoplastic plastic such as a polyurethane elastomer, a polyamide elastomer, a polyester elastomer, a polychlorinated phenyl elastomer, or a polyolefin elastomer.

The holder 12 has an upper mold 20, a lower mold 22, two clamp bodies 24 detachably integrated with the lower mold 22, and two belt clamps 26. The lower mold 22 has a guide groove 28 and two convex portions 48. The guide groove 28 is a groove provided on the upper surface of the lower mold 22 and parallel to the traveling direction of the belt 13, and the first belt end portion 16 and the 25th belt end portion 18 which are butted from the lower support end portions are provided. . The width and depth of the guiding groove 28 are formed by matching the width and thickness of the joined belt 13. The convex portions 48 are respectively provided at the center of both side portions of the belt 13 in the traveling direction side. As shown in Fig. 3, the convex portion 48 of the lower mold 22 is provided on the lower surface of the lower mold 22, and the tip end projects toward the traveling direction of the belt 13.

The upper mold 20 is disposed on the upper side of both end portions of the first belt end portion 16 and the second belt end portion 18 after the butting (second drawing). The upper mold 20 has a heater built therein and is connected to the connector 47 through wiring. The heater can use a hot wire heater or a ceramic heater. Moreover, the temperature can be easily controlled by using a PTC (Positive Temperature Coefficient) heater. The width of the upper mold 20 is smaller than the guide groove 28, preferably to the extent that no gap is formed between the upper mold 20 and the guide groove 28.

The caliper body 24 is a rectangular sheet of material having apertures 30 and recesses 32 therein. The caliper body 24 includes a first body 33 having a first upper surface 31 and a second body 37 having a second upper surface 35 that is lower than the first upper surface 31. The groove 32 is provided on the first upper surface 31, parallel to the traveling direction of the belt, and has the same width as the guiding groove 28. When the caliper body 24 is integrated with the lower mold 22, the depth of the recess 32 is preferably the same as that of the guide recess 28. The hole 30 penetrates the second body 37 in the thickness direction, and the convex portion 48 of the lower mold 22 is inserted. The first body 33 has female threads 36 on both sides of the recess 32.

The belt clamp 26 is a rectangular plate in which a hole 40 and a notch hole 42 are formed with a clamping screw 43 inserted therein. The notch hole 42 is cut away by one side surface side of the longitudinal direction of the belt clamp 26. The clamp screw 43 is insertable into the notch hole 42 from the width direction of the belt clamp 26. The belt clamp 26 is a clamping screw 43 inserted into the lower hole 40 and the notch hole 42 in a state where the first belt end portion 16 or the second belt end portion 18 is sandwiched between the surface of the clamp body 24 and the second belt end portion 18. The female thread 36 is locked, whereby it is fixed by the clamp body 24.

The pressurizing body 14 has a frame portion 44 and a pressurizing screw 46. The frame portion 44 has a C-shaped cross section, and has a plate-shaped upper end portion and is divided into two lower end portions. The frame portion 44 holds the lower mold 22 up and down so that the lower end portion is disposed on the lower surface of the lower mold 22, and the upper end portion is disposed on the upper surface of the lower mold 22. At the center of the upper end portion, a female screw 45 that locks the pressure screw 46 is formed. The frame portion 44 is pressed against the upper mold 20 to the lower mold 22 by the pressing screw 46 that is locked into the female thread 45 in a state in which the lower mold 22 is held up and down.

As shown in FIG. 4, the clamp main body 24 is integrally formed with the first main body 33 and the second main body 37. The first body 33 has a blocking projection 50 that protrudes toward the hole 30. The occlusion projection 50 is a portion of the opening of the obstruction hole 30 that is away from the tip end of the second body 37. The surface 49 of the first body 33 on the side in contact with the second body 37 is inclined from the lower end to the upper end toward the radially outer side of the hole 30.

(Method of Using the Belt Bonding Device) Next, a method of joining the belt using the belt joining device 10A of the present embodiment will be described. First, the belt clamp 26 is temporarily fixed to the clamp body 24. That is, the clamp screw 43 is inserted into the lower hole 40, and the female screw 36 of the clamp screw 43 to one side of the clamp body 24 is locked and temporarily fixed. In the state where the other side female thread 36 is not inserted with the clamp body 24, the clamp screw 43 is locked and temporarily fixed (Fig. 5).

The first belt end portion 16 is disposed to the recess 32 of the caliper body 24. Next, the belt clamp 26 is rotated around the clamp screw 43 to arrange the belt clamp 26 to the upper side of the first belt end portion 16 to temporarily fix the clamp screw 43 to the female thread 36 on the other side. The notch hole 42 is inserted. In this state, each of the clamp screws 43 is locked, and the first belt end portion 16 is fixed to the clamp body 24 by the belt clamp 26 and the clamp screw 43 (Fig. 6). The belt clamp 26 is temporarily fixed to the clamp body 24 by the clamp screw 43 on one side, and the clamp screw 43 inserted from the width direction to the other side is fixed to the clamp body 24, whereby the configuration can be simplified. The operation of the first belt end portion 16 to the groove 32.

Next, the second upper surface 35 of the caliper body 24 is placed on the lower surface side of the lower mold 22, and the tip end of the convex portion 48 is inserted into the lower side of the occlusion projection 50 from the hole 30 (Fig. 7). The surface 49 of the first body 33 on the side in contact with the second body 37 is inclined, whereby the tip end of the convex portion 48 reaches the deep side of the lower side of the closing projection 50.

Next, the tip end of the occlusion projection 50 is used as a fulcrum, and the caliper body 24 is rotated to contact the second upper surface 35 to the lower surface of the lower mold 22 (Fig. 8). Thereby, the convex portion 48 is inserted into the hole 30, and the clamp body 24 is integrated with the lower mold 22. The contact portion between the occluding projection 50 and the convex portion 48 is disposed on the lower side of the first belt end portion 16.

When the force T in the tensile direction acts on the first belt end portion 16, the moment M in the counterclockwise rotation is applied to the portion where the occlusion projection 50 and the convex portion 48 are in contact. The occlusion projection 50 is used as a fulcrum, and the second upper surface 35 is pressed against the lower surface of the lower mold 22, and the convex portion 48 is engaged with the hole 30, as long as a force T acts on the first belt end portion 16, The lower mold 22 and the clamp body 24 are kept in an integrated state.

Similarly, the second belt end portion 18 is fixed to the clamp body 24 by another belt clamp 26 and a clamp screw 43 (Fig. 9). The clamp body 24 and the belt clamp 26 are fixed to the first belt end portion 16 and the second belt end portion 18 without applying tension. Further, the position of the second belt end portion 18 of the fixed caliper body 24 is such that when the caliper body 24 is fixed to the lower mold 22, a predetermined tension can be applied to the belt.

The tong body 24 is stretched in the direction of the lower mold 22, and is integrated with the lower mold 22, thereby being held in a state in which the first belt end portion 16 and the second belt end portion 18 are butted (Fig. 10) ).

In the side of the second belt end portion 18, the force acting on the belt is applied to the contact portion between the occlusion projection 50 and the convex portion 48 by the tension acting on the belt, and the lower mold 22 is integrated with the clamp body 24. It is maintained in the state of the state.

Next, the upper mold 20 is placed so as to be covered from the first belt end portion 16 and the second belt end portion 18 (Fig. 11).

Next, the holder 12 is sandwiched between the upper and lower sides to arrange the frame portion 44. In this case, the upper end portion is disposed above the upper mold 20, and the lower end portion is disposed on the longitudinal end sides of the lower mold 22. The first belt end portion 16 and the second belt end portion 18 are pressed in the thickness direction by the upper mold 20 by locking the pressurizing screw 46 (Fig. 1).

In this state, the first joining portion 17 and the second joining portion 19 are heated by the heater 47 to the heater built in the upper mold 20 for a predetermined period of time. The heated first joint portion 17 and the second joint portion 19 are melted.

After a predetermined period of time, the energization of the heater is stopped, and the molten portion is cooled, whereby the first joint portion 17 and the second joint portion 19 are solidified to form a fusion portion. After cooling, the pressurizing screw 46 is released, and the frame portion 44 is removed from the holding body 12. Then, the clamp screw 43 is loosened, and the belt clamp 26 is removed from the clamp body 24, whereby the holder 12 is removed from the first belt end portion 16 and the second belt end portion 18. In this way, the first belt end portion 16 and the second belt end portion 18 can be joined.

The belt engaging device 10A of the present embodiment includes a convex portion 48 of the lower mold 22 and a belt pulling mechanism having a hole 30 of the clamp body 24, whereby the belt end can be butt-joined in a state where tension is applied. Departments. Therefore, the belt engaging device 10A can be easily joined even in a narrow place.

Further, the caliper body 24 has the occluding projection 50, whereby the force T of the tension belt 13 is used to strongly integrate with the lower mold 22. Therefore, the belt engaging device 10A can prevent the lower die 22 from being accidentally separated from the caliper body 24, so that workability can be further improved.

In the case of the first embodiment described above, the case where the pressurizing body 14 has the frame portion 44 shown in Fig. 2 has been described, but the present invention is not limited thereto. For example, the pressurizing body 14A shown in Fig. 12 can also be used. The pressurizing body 14A includes: a pair of links; a fastener that connects the links; and a spring that clamps the fastener to apply force to one side in the closing direction. The pressurizing body 14 holds the holding body 12 by a link, and can pass the upper mold 20 to press the first belt end portion 16 and the second belt end portion 18 in the thickness direction.

2. Second Embodiment A belt engaging device 10B shown in Fig. 13 includes a holding body 51 and a pressing body 54. The belt joining device 10B differs from the first embodiment in that the heater is not housed in the upper mold but is provided on the lower surface of the lower mold 52, and the clamp system is different. The holding body 51 has a lower mold 52, an upper mold 53, a clamp body 58, and two belt clamps 60.

As shown in Fig. 14, the lower mold 52 has a convex portion 66. The convex portion 66 is provided at the center of one side of one side of the traveling direction side of the belt. A heater 56 is provided on the lower surface of the lower mold 52.

First, the clamping screw 62 is inserted into the lower hole, the female screw of the clamping screw 62 to one side of the lower mold 52 is locked, and the belt clamp 60 of one side is temporarily fixed to the lower mold 52. On the other side of the female thread, the clamp screw 62 in a state in which the clamp body 58 is not inserted is locked and temporarily fixed (Fig. 15).

The first belt end portion 16 is disposed to the guide groove 55 of the lower mold 52. Next, the belt clamp 60 is rotated around the clamp screw 62 that temporarily fixes the belt clamp 60, and the clamp screw 62 temporarily fixed to the female thread on the other side is inserted into the notch hole 61. When the belt clamp 60 is placed on the upper side of the first belt end portion 16, the clamp screws 62 are locked, and the first belt end portion 16 is fixed to the lower mold 52 by the belt clamp 60 and the clamp screw 62. .

Next, the second belt end portion 18 is fixed to the clamp body 58 by the belt clamp 60 and the clamp screw 62 in the same order as in the first embodiment (Fig. 16).

Next, the second upper surface 59 of the caliper body 58 is disposed to the lower surface side of the lower mold 52 to insert the tip end of the convex portion 66 to the lower side of the occlusion projection (not shown) so that the caliper body 58 and the lower mold 52 integration (Figure 17). In the case of this figure, the first belt end portion 16 and the second belt end portion 18 have finger joints including a layer of thermoplastic plastic.

Next, the upper mold 53 is placed on the first belt end portion 16 and the second belt end portion 18 so as to be covered from above, and the holding body 51 is sandwiched up and down to arrange the frame portion 63. The first belt end portion 16 and the second belt end portion 18 are pressed in the thickness direction by the locking of the pressing screw 64 through the upper mold 53.

The belt joining device 10B of the present embodiment includes a belt pulling mechanism, whereby the same effects as those of the first embodiment described above can be obtained.

In the present embodiment, by arranging the heater 56 to the lower surface of the lower mold 52, the heater 56 having a large area can be used. Therefore, since the belt joining device 10B is in a wide range, the first belt end portion 16 and the second belt end portion 18 can be heated, so that the belt joining device 10B can be joined more reliably.

3. Third Embodiment A belt jointing device 10C shown in Fig. 18 of the same reference numeral is attached to the same configuration as that of Fig. 13, and the pressurizing body 70 is different from the second embodiment. The pressurizing body 70 has a frame portion 72, an elastic portion 73 disposed between the frame portion 72 and the upper mold 53, and a cam mechanism 76 that presses the elastic portion 73 to the upper mold 53.

As shown in Fig. 19, the frame portion 72 has a substantially C-shaped cross section, and has an upper end portion 78 having a plate shape, a lower end portion 80 disposed in parallel with the upper end portion 78, and a back plate portion 82 connecting the upper end portion 78 and One side of the lower end portion 80. On both sides of the back plate portion 82, between the upper end portion 78 and the lower end portion 80, there is an intermediate portion 81 which is convex in parallel at the upper end portion 78.

The upper end portion 78 is formed with a rectangular through hole 84 at the center. Female threads 85 are respectively provided at the upper ends 78 on both sides in the width direction of the through holes 84. Further, in the upper end portion 78, escape holes 88 are formed in four corners, and a total of four are provided so as to surround the through holes 84, and the installation holes 86 are formed at four corners of the upper end portion 78, for a total of four.

The elastic portion 73 is transmitted through the holding portion 90 and supported by the lower surface of the upper end portion 78. The holding portion 90 has a holding plate 91 disposed in parallel with the upper end portion 78, and a shaft 93 fixed to the four corners of the holding plate 91. The holding plate 91 is loaded with a return spring 94 to a shaft 93 inserted into the installation hole 86, and is fixed at the tip end side of the shaft 93 so that the return spring 94 does not come out from the shaft 93, whereby the upper end portion 78 is in the thickness direction. It is movably supported.

The elastic portion 73 has a plate 92 that is disposed in parallel with the holding plate 91, and a coil spring 74 that is disposed between the holding plate 91 and the pad 92. The pad 92 is attached to the four corners of the shaft 95 which protrudes from the holding plate 91. The coil spring 74 is loaded to the shaft 95, and the nut 75 is locked to the tip end of the shaft 95 inserted into a hole (not shown) formed in the holding plate 91, and the holding plate 91 is movably moved in the thickness direction. support.

The cam mechanism 76 has a plate cam 96, a link 98 integrally formed on the plate cam 96, and a shaft 100. As shown in Fig. 20, the plate cam 96 has a disk shape in which a hole 97 penetrating in the thickness direction is provided at a position deviated from the center. The plate cam 96 is a shaft 100 that is stretched in the width direction of the through hole 84, and the insertion hole 97 is rotatably supported and disposed in the through hole 84. The shaft 100 locks the bolt 102 to the female thread 85, thereby being fixed to the upper end portion 78.

As shown in Fig. 21, between the upper mold 53 and the upper end portion 78, a retaining plate 91, a coil spring 74, and a splicing plate 92 are disposed in this order from the upper end portion 78 side, and the plate cam 96 is coupled to the retaining plate 91. Pick up. The cam mechanism 76 tilts the link 98 centering on the shaft 100, whereby the plate cam 96 projecting from the upper end portion 78 to the lower side can be changed only by the portion of the center of the plate cam 96 that is offset from the center of the hole 97. The length. The lower end portion 80 is disposed in a state where there is a gap between the lower surface of the heater 56 and the heater 56. The intermediate portion 81 is in contact with the lower surface of the lower mold 52. The holding body 51 is positioned with respect to the depth direction of the frame portion 72 by the adjusting screw 104 locked in the thickness direction of the back plate portion 82.

When the link 98 is tilted to one side, and the rotated plate cam 96 protrudes more from the upper end portion 78 toward the lower side, as shown in Fig. 18, the cam mechanism 76 can press the mortgage plate 92 to the upper mold 53. That is, when the plate cam 96 rotates and protrudes from the upper end portion 78 toward the lower side, it is pressed against the holding plate 91 to the lower side. The holding plate 91 is contracted by the return spring 94 and moved to the lower side so as to be separated from the upper end portion 78. As the retaining plate 91 moves, the pad 92 is lowered until it comes into contact with the upper die 53. Only the portion of the plate cam 96 that protrudes from the upper end portion 78 toward the lower side can press the first belt end portion 16 and the second belt end portion 18 in the thickness direction with a large force. The pad 92 acts on a reaction force of the same magnitude as the force at which the pad 92 pushes the upper die 53. When the reaction force becomes larger than the restoring force of the coil spring 74, only the portion, the coil spring 74 contracts. The belt engaging device 10C is contracted by the coil spring 74 to prevent the force of the pressing plate 92 from being pressed against the upper mold 53 excessively.

When the link 98 is tilted to the other side so that the length of the plate cam 96 projecting from the upper end portion 78 to the lower side is short, as shown in Fig. 22, the cam mechanism 76 can be released by the splicing plate 92. It is pressed against the upper mold 53. That is, when the length of the plate cam 96 projecting from the upper end portion 78 toward the lower side becomes smaller when the plate cam 96 is rotated, the holding plate 91 is moved toward the upper end portion 78 by the restoring force of the return spring 94. As the holding plate 91 moves, the pad 92 is lifted away from the upper die 53. The tip end of the shaft 95 passes through the escape hole 88, whereby the retaining plate 91 can contact the upper end portion 78.

In the case of the present embodiment, the link 98 is tilted to one side or the other side to be tilted, whereby the first belt end portion 16 and the second belt end portion can be pressed in the thickness direction by the upper mold 53. 18, at the same time release the pressure.

The elastic portion 73 is not limited to the case of having the pad 92 and the coil spring 74. For example, as shown in the belt joining device 10D of Fig. 23, the rubber sheet 110 may be used as the elastic portion. The rubber sheet 110 is directly fixed to the lower surface side of the holding plate 91, that is, directly fixed to the surface on the side of the upper mold 53. In the case of the present modification, the first belt end portion 16 and the second belt end portion 18 can be pressed in the thickness direction by the operation link 98, or the pressurization can be released. In this case, the frame portion 112 can omit the escape hole 88 of the upper end portion 78.

4. Modifications The present invention is not limited to the above-described embodiments, and can be appropriately modified within the scope of the present invention. In the case of the above-described embodiment, the first joint portion 17 and the second joint portion 19 have been described as being previously joined to the belt body 15, but the present invention is not limited thereto. For example, the joint portion may be different from the belt body and disposed between the first belt end portion and the second belt end portion fixed to the holder. A column heater can also be used for the heater.

10A, 10B, 10C, 10D‧‧‧ belt jointing device

12‧‧‧ Keeping body

14‧‧‧ Pressurized body

16‧‧‧1st belt end

18‧‧‧2nd belt end

20‧‧‧上模

22‧‧‧Down

24‧‧‧Clamp body

26‧‧‧ Belt clamp

48‧‧‧ convex

49‧‧‧ surface

50‧‧‧Closed bulge

Fig. 1 is a perspective view showing the belt joining device of the first embodiment. Fig. 2 is an exploded perspective view showing the belt joining device of the first embodiment. Fig. 3 is a longitudinal sectional view of the lower mold of the first embodiment. Fig. 4 is a longitudinal sectional view showing the clamp body of the first embodiment. Fig. 5 is a perspective view (1) for explaining a joining method of the belt joining device of the first embodiment. Fig. 6 is a perspective view (2) for explaining a joining method of the belt joining device of the first embodiment. Fig. 7 is a longitudinal sectional view (1) for explaining a joining method of the belt joining device of the first embodiment. Fig. 8 is a longitudinal sectional view (2) for explaining a joining method of the belt joining device of the first embodiment. Fig. 9 is a perspective view (3) for explaining a joining method of the belt joining device of the first embodiment. Fig. 10 is a perspective view (4) for explaining a joining method of the belt joining device of the first embodiment. Fig. 11 is a perspective view (5) for explaining a joining method of the belt joining device of the first embodiment. Fig. 12 is a perspective view of a belt engaging device according to a modification of the first embodiment. Fig. 13 is a perspective view showing the belt joining device of the second embodiment. Fig. 14 is a perspective view showing the lower side of the belt engaging device of the second embodiment. Fig. 15 is a perspective view (1) for explaining a joining method of the belt joining device of the second embodiment. Fig. 16 is a perspective view (2) for explaining a joining method of the belt joining device of the second embodiment. Fig. 17 is a perspective view (3) for explaining a joining method of the belt joining device of the second embodiment. Fig. 18 is a perspective view showing the belt engaging device of the third embodiment. Fig. 19 is a perspective view showing the frame portion of the third embodiment. Fig. 20 is a perspective view showing a link of the third embodiment. Fig. 21 is a side view showing the belt engaging device of the third embodiment. Fig. 22 is a perspective view showing the belt engaging device of the third embodiment, showing a state after the pressurization is released. Fig. 23 is a perspective view showing a belt engaging device according to a modification of the third embodiment.

Claims (8)

A belt engaging device comprising: a holding body that abuts both end portions of the first belt end portion and the second belt end portion; and a pressing body that presses the both end portions in a thickness direction; wherein: the holding The system has: a lower mold, wherein the first belt end portion and the second belt end portion are disposed on an upper surface; and the upper mold is disposed on an upper surface of the first belt end portion and the second belt end portion; a belt clamp; at least one of the clamp body, the first belt end or the second belt end is sandwiched therebetween, the belt clamp is detachably fixed; and a heater heats the first belt end And the second belt end portion; and a belt pulling mechanism between the clamp body and the lower mold. The belt engaging device according to claim 1, wherein the belt pulling mechanism has: a convex portion provided on a lower surface of the lower mold; and a hole formed on the clamp body; The convex portion protrudes from a side surface of the lower mold to which the clamp body is attached, and the clamp system has a occlusion projection that blocks a portion of the upper surface of the hole away from the side of the lower mold. The belt engaging device according to claim 2, wherein the blocking projection is inclined from a lower end to an upper end toward a radially outer side of the hole. The belt engaging device according to any one of claims 1 to 3, wherein the belt clamp is fixed to the clamp body by a screw. The belt engaging device according to any one of claims 1 to 3, wherein the pressurizing system has a frame portion, an elastic portion disposed between the frame portion and the upper mold, and a cam mechanism Pressing the aforementioned elastic portion to the aforementioned upper mold. The belt engaging device according to claim 5, wherein the elastic portion is a coil spring. The belt engaging device according to claim 5, wherein the elastic portion is a rubber sheet. The belt engaging device according to claim 5, wherein the cam mechanism has a plate cam rotatably supported by the frame portion, and a link integrally formed on the plate cam.