JP2010014194A - Joint belt and belt joint processing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a belt for preventing the occurrence of a crack in a joint part of belt both end parts. <P>SOLUTION: At least two projection parts 23' and 23' are formed in one end part 21 of the belt 20, and a recessed part 24 is formed between these projection parts 23' and 23'. The other end part 22 of the belt 20 is complementarily formed in the one end part 22. A slit 30 extending in the longitudinal direction from a bottom part 24D of the recessed part 24 is formed in the one end part 21. An end surface 21K of the one end part 21 of the belt 20 is butted against an end surface 22K of the other end part 22, and an endless joint belt is formed by joining these end surfaces 21K and 22K. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a joint belt formed by joining two end portions of a belt, for example, being used by being hung on a crown pulley, and a belt joint processing method for obtaining the joint belt.

  The flat belt for conveyance, transmission, etc. may be used as an endless flat belt by joining both ends thereof. As a method of joining the flat belt, a plurality of convex portions are formed at one end of the flat belt to form a finger, and the other end is formed with a plurality of concave portions to complement the one end. There is known a finger joint in which each convex portion is fitted into each concave portion and joined to each other in a finger shape. The belt obtained by the finger joint is relatively excellent in flexibility of the belt joint portion, and has an advantage that it can be easily adapted to, for example, a small-diameter pulley.

Patent Document 1 discloses a method of joining both end portions of a belt by thermal fusion in the finger joint. In the case of thermal fusion, the belt has a thermoplastic resin layer and is heated while the butted portion of the belt is pressed in the thickness direction, whereby both ends of the belt are joined by the molten thermoplastic resin. Further, instead of heat fusion, a method of joining both end portions of the belt with an adhesive is also considered. The method using an adhesive is effective when it is difficult to melt the belt, for example, when a high-rigidity and high-melting-point polyamide core is used as the core.
International Publication Number WO2006 / 022332

  However, the joint belt obtained by the finger joint is excellent in flexibility, but has a problem that it is easily broken along the finger. For example, when a joint belt is used for a crown pulley, if the joint belt is bent in the width direction so as to follow the outer peripheral surface of the pulley, cracks are likely to occur in the joint portion, and early running failure tends to occur. In particular, a belt having high rigidity or a belt in which both ends are bonded with an adhesive exhibits this tendency when the crown height is higher than necessary.

  Accordingly, the present invention has been made in view of the above problems, and it is an object of the present invention to prevent the seam from cracking and improve the durability of the belt even when the belt is used as a crown pulley. To do.

  The joint belt according to the present invention is a joint belt formed by abutting the end face of the first belt end and the end face of the second belt end, and joining the end faces of both ends to each other. The portion is provided with a longitudinal slit extending in the longitudinal direction from the end surface of the first belt end portion or extending in the longitudinal direction in the vicinity of the end surface of the first belt end portion.

  The first belt end is formed with a first recess penetrating in the thickness direction, and the second belt end is a second protrusion having a shape matching the first recess. Is preferably formed. In this case, the second convex portion is fitted into the first concave portion, the end surfaces of both end portions are butted together, and the both end surfaces are joined to each other, and the first belt end portion is connected to the bottom portion of the first concave portion. It is preferable that an extending vertical slit is formed. A plurality of first recesses are formed at the first belt end, and the vertical slit preferably extends from the bottom of one first recess among the plurality of first recesses.

  For example, at least two first protrusions protrude from the first belt end and are formed in a finger shape, whereby the first recess is formed between the two first protrusions. . On the other hand, the second belt end portion has at least two second concave portions corresponding to the first convex portion, and has a shape complementary to the first belt end portion. The second convex portion is formed between the two second concave portions.

  The first concave portion has a triangular shape, and the vertical slit preferably extends from the bottom of the concave portion constituting the apex of the triangle. The vertical slit is preferably arranged at the center position in the width direction.

  Both end faces are joined by, for example, an adhesive or by heat fusion. Preferably, the end surface of the first belt end portion is at least partially inclined with respect to the width direction or parallel to the longitudinal direction of the belt, and the second belt end portion is relative to the first belt end portion. The end faces are joined with an adhesive by pressing the abutting portions at both ends in the belt width direction. The joint belt according to the present invention is suitable for being used on a crown pulley. Further, the joint belt is preferably an endless belt, with the first belt end being one end of the belt and the second belt end being the other end of the belt.

  The method according to the present invention is a method of manufacturing a joint belt by abutting the end surfaces of the first belt end and the second belt end and joining the end surfaces of both ends to each other. The portion is provided with a longitudinal slit extending from the end surface of the first belt end portion in the belt longitudinal direction, or extending in the belt longitudinal direction in the vicinity of the end surface of the first belt end portion. .

  Another method according to the present invention is a method of manufacturing a joint belt by joining first and second belt end portions, wherein the first belt end portion has a belt longitudinal direction from the end surface of the first belt end portion. A longitudinal slit extending in the direction is formed, the end face of the first belt end where the longitudinal slit is formed is abutted against the end face of the second belt end, and the end faces of both ends are joined together. To obtain a joint bell.

  Since the belt which concerns on this invention is arrange | positioned in the seam vicinity, or the vertical slit connected to a seam is formed, a seam part becomes easy to bend in the width direction. Therefore, the stress applied to the seam can be reduced, and cracks can be prevented from occurring in the seam.

  The present invention will be described below with reference to the drawings. 1-4 is a figure for demonstrating the manufacturing method of the endless belt based on the 1st Embodiment of this invention. Hereinafter, the configuration of the endless belt according to the first embodiment will be described with reference to the manufacturing method.

  1 and 2 show a pressure mold used for joining both ends of a belt. The pressure mold 10 includes a lower mold 11 and a movable member 12. The lower mold 11 has a base 11A having an upper surface 11U formed in a rectangular plane and a side wall 11B provided on one side of the upper surface 11U, and is formed in an L-shaped cross section as shown in FIG. The inner wall surface 11C of the side wall 11B is a surface perpendicular to the upper surface 11U.

  The movable member 12 is disposed on the upper surface 11U of the base 11A so as to face the inner wall surface 11C of the lower mold 11 and extends in the longitudinal direction L of the upper surface 11U. The facing surface 12C of the movable member 12 facing the inner wall surface 11C is parallel to the inner wall surface 11C. The base 11A is provided with guide grooves 11E and 11F penetrating in the thickness direction (that is, the vertical direction D) and extending in the width direction W of the upper surface 11U in the vicinity of both ends in the longitudinal direction L.

  Holes 12E and 12F are formed in the vertical direction D in the vicinity of both end portions in the longitudinal direction of the movable member 12. Retaining screws 17E and 17F are inserted into the holes 12E and 12F, respectively, and lower portions of the retaining screws 17E and 17F are inserted into the guide grooves 11E and 11F, respectively. The movable member 12 is fixed to the base 11A by fastening screws 17E and 17F so that it can be displaced in the width direction W of the upper surface 11U. The movable member 12 is displaced in the width direction W when the retaining screws 17E and 17F are guided by the guide grooves 11E and 11F, respectively.

  A presser screw base 13 is fixed to the other side of the upper surface 11U. The presser screw base 13 has a screw hole 13 </ b> A in which a screw groove is cut in the width direction W. A presser screw 14 extending along the width direction W is inserted through the screw hole 13A. One end of the presser screw 14 is fixed to the movable member 12, and the presser screw 14 is formed integrally with the movable member 12. A flange 15 is provided at the other end of the presser screw 14 so that the screw can be easily gripped. When the presser screw 14 is tightened or loosened, the movable member 12 is displaced together with the presser screw 14 in the width direction W relative to the presser screw base 13, that is, the base 11A.

  FIG. 3 shows both end portions of the belt 20 according to the present embodiment. The belt 20 is a belt-like flat belt, and is not particularly limited, but one or more canvases, a resin layer, a resin sheet such as a polyamide sheet, or both surfaces of a core made of a canvas. A rubber layer or the like is formed by being laminated, or a core body, a rubber layer alone, or a plurality of rubber layers.

  A plurality of convex portions 23 ′ (two convex portions in the present embodiment) are formed on one end portion 21 of the belt 20 and project in the longitudinal direction of the belt and have an isosceles triangular shape when viewed from above. . The length of each convex portion 23 ′ in the belt longitudinal direction is longer than the width of the convex portion 23 ′ in the belt width direction. Further, the thickness of each of the convex portions 23 'is the same as the thickness of the other portions of the belt. The outer peripheral wall 23 </ b> A of the convex portion 23 ′ is inclined with respect to the belt width direction when viewed from above, and constitutes an end surface (first end surface 21 </ b> K) of the end portion 21. The plurality of convex portions 23 ′ are arranged along the belt width direction, and each convex portion 23 ′ is continuously connected to another adjacent convex portion 23 ′, whereby the first end surface 21 K is connected to the belt. It consists only of the surface inclined with respect to the width direction.

  A concave portion 24 is formed between the convex portions 23 'and 23'. The concave portion 24 is a notch penetrating in the thickness direction of the belt, and has a shape (isosceles triangle) that coincides with the convex portion 23 ′, whereby one end portion 21 of the belt 20 has a sawtooth shape (finger). Formed).

  A plurality of concave portions (notches) 24 ′ penetrating in the thickness direction of the belt are formed at the other end portion 22 of the belt 20 corresponding to the convex portions 23 ′. The inner peripheral wall 24A of the recess 24 'constitutes the end surface (second end surface 22K) of the other end portion 22. The shape of each concave portion 24 ′ has a shape that matches that of each convex portion 23 ′. Furthermore, each recessed part 24 'is continuously connected to the adjacent recessed part 24', whereby the second end face 22K is composed only of a surface inclined with respect to the width direction.

  A convex portion 23 is formed between the concave portions 24 ′ and 24 ′. The convex portion 23 has a shape (an isosceles triangle) coincident with the concave portions 24, 24 ′, whereby the other end portion 22 is formed in a sawtooth shape (finger shape) and is complementary to the one end portion 21. Presents a unique shape. Each convex portion 23, 23 'can be fitted into the corresponding concave portion 24, 24', respectively, and when each convex portion 23, 23 'is fitted into the concave portion 24, 24', the first end face 21K is , Butted against the second end face 22K.

  Note that both end portions 21 and 22 of the belt 20 are cut and molded by, for example, a known cutting means. The first and second end faces 21K and 22K are parallel to the belt thickness direction, but may be inclined with respect to the thickness direction.

  In this embodiment, a vertical slit 30 is formed at one end 21 of the belt. The vertical slit 30 penetrates in the belt thickness direction and extends linearly in parallel to the belt longitudinal direction from the bottom 24D of the concave portion 24 constituting the top of the isosceles triangle. The longitudinal slit 30 is sufficiently shorter than the length of the belt. Therefore, the belt 20 is divided in the width direction by the longitudinal slit 30 at one end portion 21, but in the width direction by the longitudinal slit 30 in other portions. Is not divided.

  The recess 24 is arranged at the center position in the belt width direction. Therefore, the vertical slit 30 extending from the bottom 24D of the recess 24 is also disposed at the center position 20C in the belt width direction. The vertical slit 30 is formed by cutting from the bottom 24D by a known cutting means, for example.

  Next, a process of manufacturing an endless belt from the belt will be described with reference to FIGS. First, an adhesive is applied to the belt 20 at the abutting surfaces of the end portions 21 and 22, that is, one of the first and second end surfaces 21K and 22K, or both. However, the adhesive is not applied to the inside of the vertical slit 30 at this time. Thereafter, the convex portions 23 and 23 'are fitted into the concave portions 24 and 24', so that both end faces 21K and 22K of the belt are abutted. Next, the butted portions B of the belt end portions 21 and 22 are placed on the upper surface 11U of the base 11A between the side wall 11B and the movable member 12.

  When the belt 20 is placed on the upper surface 11U, one side surface 20A of the belt extends along the inner wall surface 11C of the side wall 11B so that the longitudinal direction of the belt coincides with the longitudinal direction L of the upper surface 11U. The position of the movable member 12 is adjusted in advance so that the belt 20 can be inserted between the side wall 11B and the movable member 12. Further, as the adhesive, a polyamide-based adhesive (for example, Polypond A (trade name, manufactured by Nitta Corporation)), a urethane-based adhesive, or the like is used.

  Next, the presser screw 14 is tightened to displace the facing surface 12C of the movable member 12 so as to approach the side wall 11C, and the butted portion B of the belt 20 is moved between the facing surface 12C of the movable member 12 and the side wall 11B. It is held by the wall surface 11C. The presser screw 14 is further tightened from the held state, whereby the butted portion B of the belt 20 is pressed in the belt width direction. The clamping force in the width direction of the belt is continued until the adhesive is cured or solidified, and the first and second end surfaces 21K and 22K that are abutted are joined via the cured or solidified adhesive. . As a result, both end portions 21 and 22 of the belt are joined together, and an endless belt 20 'having both end surfaces 21K and 22K as seams is obtained. However, no adhesive is applied to the inside of the slit 30, and therefore one end 21 of the endless belt 20 ′ is divided in the width direction by the slit 30.

  FIG. 5 shows a state where the endless belt 20 ′ is hung on the crown pulley 40. The crown pulley 40 is a pulley in which the diameter of the central portion in the axial direction is larger than the diameter of both end portions, and the outer peripheral surface 40A is formed so that the central portion in the axial direction swells. The endless belt 20 'hung on the crown pulley 40 is bent along the outer peripheral surface 40A of the crown pulley 40, and the center position 20C in the belt width direction swells toward the outside of the pulley.

  The endless belt 20 ′ according to the present embodiment is easily bent in the width direction around the longitudinal slit 30 (center position 20 </ b> C), so that an excessive stress does not act on the seam and the outer peripheral surface of the crown pulley 40. Bent along 40A. Thus, in the present embodiment, even when the endless belt 20 ′ is used for the crown pulley 40, cracks and the like are unlikely to occur at the joints of the end portions 21 and 22, and the durability of the belt can be improved.

  When the endless belt 20 ′ is hung on the crown pulley 40, the endless belt 20 ′ is bent in the width direction around the longitudinal slit 30. Therefore, stress concentrates at the center position 20 C, and extends from the terminal end 30 E of the longitudinal slit 30 along the longitudinal direction of the belt. As a result, the vertical slit 30 may be further elongated. However, the rotation of the pulley 40 is appropriately transmitted to the endless belt 20 ′ regardless of the length of the vertical slit 30. Therefore, even if the vertical slit 30 becomes longer, troubles may occur in the belt running. There is no.

  In this embodiment, since both end portions 21 and 22 are joined without applying pressure in the thickness direction of the belt, the thickness of the joined portion may be thinner than the thickness of the other portions. Is prevented. Further, since the end faces of the belt are joined without melting, it is not necessary for the belt to have a thermoplastic resin layer, and even if there is a thermoplastic resin layer, both ends 21 of the belt without any change in physical properties due to melting, Since 22 can be joined, the physical properties of the joined portion and other portions can be made uniform.

  The shapes of the convex portions 23, 23 'and the concave portions 24, 24' are not limited to isosceles triangles, and may be other triangles as long as they become narrower toward the tip. In the following description, the convex portion 23 will be described, but the convex portion 23 ′ and the concave portions 24 and 24 ′ have the same shape. However, in the configuration of FIG. 7, the concave portion 24 has the same shape as the convex portion 23, but the convex portion 23 ′ and the concave portion 24 ′ do not have the same shape as the convex portion 23.

  For example, when viewed from above, each convex portion 23 has a right triangle whose one side extends parallel to the longitudinal direction of the belt, and the end surface 21K of the end portion 21 is parallel to the surface parallel to the longitudinal direction and the width direction. It may be formed only from the inclined surface. Moreover, as shown in FIG. 6, it may become narrow as it goes to the front-end | tip part 23T, and the outer peripheral wall 23A of the front-end | tip part 23T may be formed in the curved surface.

  Further, as shown in FIG. 7, the convex portion 23 is connected to the relatively narrow width portion 23 </ b> X and the distal end side of the narrow width portion 23 </ b> X, and has a relatively wide width portion 23 </ b> Y. You may have. For example, the convex portion 23 is gradually narrowed from the root 23Z to form a narrow width portion 23X, and the width is gradually increased from the narrow width portion 23X toward the distal end portion 23T to increase the wide width portion. 23Y is formed, and the wide width portion 23Y constitutes the tip portion 23T of the convex portion 23. The outer peripheral wall 23A (tip surface) on the tip portion 23T side of the wide width portion 23Y is formed in a curved surface.

  According to the configuration of FIG. 7, when the endless belt is pulled in the longitudinal direction, the outer peripheral wall 23 </ b> A on the base 23 </ b> Z side of the wide width portion 23 </ b> Y engages with the inner peripheral wall 24 </ b> A of the concave portion 24. It becomes difficult to detach from the material, and the tensile resistance is improved. In the configuration shown in FIGS. 6 and 7, the vertical slit 30 extends in the belt longitudinal direction from the bottom of the recess 24 (that is, the portion corresponding to the tip 23T), as in the belt shown in FIG.

  Furthermore, the convex part 23 may be formed in a rectangle whose long side is parallel to the longitudinal direction of the belt and whose short side is parallel to the width direction of the belt. When the convex part 23 is a rectangle, each corner | angular part formed in the front-end | tip part of a rectangular convex part exhibits the shape chamfered, and may be formed in the curved surface. That is, in the present embodiment, the end surfaces 21K and 22K include at least one of a surface parallel to the belt longitudinal direction and a surface inclined with respect to the belt width direction, and may further include a surface parallel to the width direction. good. When the convex portion 23 is rectangular, the concave portion 24 has a rectangular shape like the convex portion 23, and the vertical slit 30 may extend from any position of the bottom portion of the concave portion 24. For example, you may extend from the corner | angular part of a rectangle, and you may extend from between a corner | angular part (namely, short side).

  In the present embodiment, a plurality of convex portions 23 ′ and concave portions 24 ′ are provided on both end portions 21 and 22, respectively, but only one may be provided. In this case, the recess 24 is not formed at one end 21, and the vertical slit 30 extends from the bottom of the recess 24 ′ at the other end 22. Of course, even when a plurality of convex portions 23 ′ and concave portions 24 ′ are provided, the vertical slit 30 may extend from the bottom portion of the concave portion 24 ′ of the other end portion 22 instead of the bottom portion of the concave portion 24. However, in any case, it is preferable that only one vertical slit 30 is provided.

  FIG. 8 is a plan view of the belt 20 according to the second embodiment. In the first embodiment, the both end portions 21 and 22 are each provided with a convex portion and a concave portion, but in this embodiment, the convex portion and the concave portion are not provided.

  In the present embodiment, the both end portions 21 and 22 each have a shape cut along an inclined line L that is inclined at a predetermined angle with respect to the belt width direction when viewed from above. That is, each of the first and second end surfaces 21K and 22K is formed of an inclined surface inclined at the same angle with respect to the belt width direction, and the other end portion 22 of the belt is in relation to the one end portion 21 of the belt. Presents a complementary shape. The first and second end surfaces 21K and 22K are surfaces parallel to the belt thickness direction, but may be inclined with respect to the thickness direction. Further, similarly to the first embodiment, the one end portion 21 is provided with a longitudinal slit 30 that is disposed at the center position 20C in the belt width direction and extends in parallel with the belt longitudinal direction from the first end surface 21K. Is formed.

  Also in this embodiment, after an adhesive is applied to at least one of the first and second end faces 21K and 22K, the first and second end faces 21K and 22K are abutted, and these are the first implementation. It is joined by the same method as the form. Also in this embodiment, both end portions of the belt have end surfaces that are inclined with respect to the belt width direction and are pressed in the belt width direction, so that both end portions of the belt can be firmly joined. Moreover, since it becomes easy to bend in the width direction centering | focusing on the vertical slit 30, durability of an endless belt when used for a crown pulley can be improved, for example.

  FIG. 9 is a plan view showing a joint portion of an endless belt 20 ′ according to the third embodiment. In each of the embodiments described above, the vertical slit 30 is connected to the end surface 21K of the end portion 21, but in the present embodiment, the vertical slit 30 is not connected to the end surface 21K.

  That is, in the present embodiment, the vertical slit 30 formed in the end portion 21 is disposed in the vicinity of the end surface 21K but at a position separated from the end surface 21K. The vertical slit 30 is disposed at the center position 20C in the belt width direction, that is, at a position that coincides with the bottom 24D of the recess 24 in the width direction, and one end 30F of the vertical slit 30 is close to the bottom 24D. The longitudinal slit 30 may be formed before the belt end portions 21 and 22 are joined, or may be formed after the belt is joined. The vertical slit 30 is formed by being cut by a known cutting means as in the first embodiment.

  Also in this embodiment, since it becomes easy to bend in the width direction centering on the longitudinal slit 30, durability, for example when used for a crown pulley, can be improved. However, in order to effectively reduce the stress acting on the seam, the vertical slit 30 should be connected to the end face 21K (that is, the seam) as in the first embodiment.

  FIG. 10 is a side view of a pressurizing mold according to the fourth embodiment. Hereinafter, a difference between the fourth embodiment and the first embodiment will be described.

  The pressurizing die 10 according to this embodiment includes first and second heating auxiliary plates 31 and 32 on the upper side and the lower side of the lower die 11 so as to sandwich the belt 20 placed on the upper surface 11U of the base 11A. Prepare. The first and second auxiliary heating plates 31 and 32 are conventionally known heating means for heating the belt 20, and are composed of, for example, a heating wire, a metal plate heated by a liquid or gas heating medium, or the like. The Further, the first auxiliary heating plate 31 can be displaced up and down relatively with respect to the base 11A, abuts on the upper surface of the belt 20, and further pressurizes the belt 20 from above. It is.

  In this embodiment, the butted portion B of the belt is pressed downward by the first heating auxiliary plate 31 while being pressed in the belt width direction, and the belt thickness is reduced by the first heating auxiliary plate 31 and the base 11A. It is pinched in the vertical direction. When the butted portion B is clamped in the belt width direction, the convex portions 23 and 23 ′ (see FIG. 3) spring up from the inside of the concave portions 24 and 24 ′ (see FIG. 3), and the convex portions 23 and 23 ′ Although there is a possibility that the fitting state with each of the recesses 24 and 24 ′ may collapse, in the present embodiment, the protrusion of the projections 23 and 23 ′ is prevented by the pressing of the first heating auxiliary plate 31. However, it is preferable that the first heating auxiliary plate 31 presses the butt portion B with a small pressing force so that the butt portion B does not compressively deform in the thickness direction. The first auxiliary heating plate 31 only abuts on the upper surface of the belt and does not need to pressurize the belt in the thickness direction.

  The butted portion B of the belt 20 may be heated from above and below by the first and second auxiliary heating plates 31 and 32 while being pressed in the belt width direction, and both ends of the belt may be joined together. In this case, the butted portion B may be pressed in the thickness direction of the belt or may not be pressed in the thickness direction. The heating is useful when, for example, a thermosetting adhesive or the like in which the adhesive is cured by heating is used. However, in this embodiment, the belt 20 is not melted by the heating, and both ends are joined by an adhesive.

  In the present embodiment, members other than the first and second auxiliary heating plates 31 and 32 may be used as heating means. In that case, the second auxiliary heating plate 32 is omitted, and the first auxiliary heating plate 31 may not have a function of heating. The same applies when there is no need to heat the belt 20.

  In the present embodiment, when the thickness of the belt 20 is larger than the height of the side wall 11B, the upper surface of the belt is disposed above the upper surface of the side wall 11B. Therefore, as shown in FIG. 10, the butted portion B is sandwiched between the first heating auxiliary plate 31 and the base 11A without being inhibited by the side wall 11B.

  On the other hand, when the thickness of the belt 20 is smaller than the height of the side wall 11B, the pressing of the first auxiliary heating plate 31 is inhibited by the side wall 11B. Therefore, it is preferable that the presser plate portion 40 is placed on the upper surface of the belt 20, and the belt 20 is pressed against the first auxiliary heating plate 31 via the presser plate portion 40 as shown in FIG. .

Next, a belt joining method in the fifth embodiment will be described.
In the above embodiments, both ends of the belt are joined by an adhesive. However, in this embodiment, the belt 20 has a thermoplastic resin layer, and both ends of the belt are joined by thermal fusion.

  In the present embodiment, as in the fourth embodiment, the abutting portion B (both end portions 21 and 22 of the belt) is placed on the lower mold 11 and also in the belt thickness direction by the first heating auxiliary plate 31. While being pressurized, the first and second auxiliary heating plates 31 and 32 are heated. By this heating, the thermoplastic resin at both end portions 21 and 22 is melted, and the melted resin is inserted between the both end surfaces 21K and 22K by the pressurization. And the both ends 21 and 22 are joined by the molten resin solidifying. In this case, the butted portion B of the belt 20 may not be clamped in the belt width direction by the movable member 12.

  Also in the present embodiment, a longitudinal slit 30 is provided at one end 21 of the belt 20. The vertical slit 30 is not blocked by the resin melted by the heating, and therefore, in the endless belt 20 ′, the vertical slit 30 extends from the end face 21 K (seam) in the belt longitudinal direction. However, a part of the vertical slit 30 (for example, a connection portion with the end surface 21K) may be blocked by molten resin. Note that both ends of the belt may be heated by a laser instead of the auxiliary heating plate and joined by laser fusion.

  In each of the above embodiments, an example of a flat belt has been described. However, the belt is not limited to a flat belt, and may be a toothed belt or the like. However, in the case of a toothed belt, the upper surface 11U of the base 11A is formed in a shape that matches the tooth shape of the toothed belt. Furthermore, in each said embodiment, the aspect when the both ends 21 and 22 of the same belt were joined and the endless belt was obtained was shown. However, it may be applied, for example, when the end of the first belt and the end of the second belt separate from the first belt are joined together.

It is the top view which looked at the pressurization type used for the manufacturing method of a 1st embodiment from the upper part. It is a side view of the pressurization type used for the manufacturing method of a 1st embodiment. It is a perspective view of the both ends of a belt. In 1st Embodiment, it is the top view which looked at the mode that the belt was mounted in the pressurization type | mold from the upper direction. It is a schematic diagram when a belt is hung on a crown pulley. It is a top view which shows another example of a convex part. It is a top view which shows another example of a convex part. It is a top view which shows the both ends of the belt in 2nd Embodiment. It is a top view which shows the both ends of the belt in 3rd Embodiment. It is a side view of the pressurization type | mold which concerns on 4th Embodiment. In the pressurization type | mold which concerns on 4th Embodiment, it is a side view when a pressing board is used.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Pressure type 11 Lower type | mold 12 Movable member 20 Belt 20 'Endless belt 21 One edge part (1st belt edge part)
22 The other end (second belt end)
23 convex part (second convex part)
23 'convex portion (first convex portion)
24 recess (first recess)
24 'recess (second recess)
24D Bottom 30 Vertical slit B Butting part

Claims (13)

In the joint belt formed by abutting the end face of the first belt end part and the end face of the second belt end part and joining the end faces of the both end parts,
The first belt end is provided with a longitudinal slit extending in the longitudinal direction from the end surface of the first belt end, or extending in the longitudinal direction in the vicinity of the end surface of the first belt end. A joint belt characterized in that The first belt end is formed with a first recess penetrating in the thickness direction, and the second belt end is a second protrusion having a shape matching the first recess. Part is formed,
The second convex portion is fitted into the first concave portion, the end surfaces of the both end portions are butted together, and both the end surfaces are joined together,
The joint belt according to claim 1, wherein the longitudinal slit extending from the bottom of the first recess is formed at the first belt end. The first belt end is formed in a finger shape with at least two first protrusions protruding, and the first recess is formed between the two first protrusions,
The second belt end has at least two second recesses corresponding to the first protrusions, and has a shape complementary to the first belt end. The joint belt according to claim 2, wherein the second convex portion is formed between two concave portions.   The first belt end is formed with a plurality of first recesses, and the vertical slit extends from the bottom of one of the plurality of first recesses. The joint belt according to claim 2.   3. The joint belt according to claim 2, wherein the first concave portion has a triangular shape, and the vertical slit extends from a bottom portion of the concave portion constituting the apex of the triangular shape.   The joint belt according to claim 1, wherein the longitudinal slit is disposed at a central position in the width direction.   The joint belt according to claim 1, wherein the both end faces are joined by an adhesive. The end surface of the first belt end portion is at least partially inclined with respect to the width direction or parallel to the belt longitudinal direction, and the second belt end portion is relative to the first belt end portion. Have complementary shapes,
The joint belt according to claim 1, wherein the butted portions of the both end portions are pressed in the belt width direction, and the end surfaces are joined together with an adhesive.   The joint belt according to claim 1, wherein end surfaces of the both end portions are joined by heat fusion.   The joint belt according to claim 1, which is used by being hung on a crown pulley.   The first belt end is one end of a belt, and the second belt end is the other end of the belt, and is an endless belt. The coupling belt described. In the method of manufacturing a joint belt by abutting the end face of the first belt end and the end face of the second belt end, and joining the end faces of the both ends.
The first belt end portion extends in the belt longitudinal direction from the end surface of the first belt end portion, or extends in the belt longitudinal direction in the vicinity of the end surface of the first belt end portion. Is provided. In a method of manufacturing a joint belt by joining first and second belt ends,
A longitudinal slit extending in the longitudinal direction of the belt from the end surface of the first belt end is formed at the first belt end, and the first belt end of the first belt end formed with the longitudinal slit is formed. A method characterized in that an end face is abutted against an end face of the second belt end, and the end faces of the both ends are joined together to obtain a joint belt.

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