JP4759581B2 - Belt joint processing method - Google Patents

Description

  The present invention relates to a method for processing a joint of a belt, which is performed in order to obtain an endless belt by joining both ends of a 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 long flat belt, a plurality of convex portions are formed on one end portion of the flat belt to form a finger shape, and a plurality of complementary portions with respect to the one end portion are formed on the other end portion. A finger joint is known in which a concave portion is formed into a finger shape, and each convex portion is fitted into each concave portion and joined to each other. When the finger joint is performed, the flat belt has a thermoplastic resin layer, the thermoplastic resin is heated and melted, and both ends of the belt are fusion bonded.

For example, Patent Document 1 discloses a belt joint processing method performed using a presetter. Here, both end portions of the belt butted on the lower die having an L-shaped cross section are placed, and the butted portion is formed on both sides of the belt by the L-shaped side wall and the movable side wall provided on the lower die. Retained from. And in the holding state, the butted portion of the belt is pressed and heated in the thickness direction by a cold platen press, and the molten thermoplastic resin is inserted between the convex portions and the concave portions without any gaps, so that both end portions of the belt Is heat-sealed.
International Publication No. 2006/022332 Pamphlet

  However, according to the method described in Patent Document 1, since a high pressure is urged in the thickness direction in the melted state at the joint portions at both ends of the belt, it is compressed and plastically deformed to other portions. In comparison with this, there is a problem that the thickness is reduced and it is difficult to ensure the flatness of the belt. In addition, when the butted portion of the belt is heated by a cold platen press, it takes time to melt the thermoplastic resin, and there is a problem that work efficiency is poor.

  Therefore, the present invention has been made in view of such problems, and provides a belt joining method that can secure the flatness of the belt by suppressing the compression plastic deformation at the joining portion and has good work efficiency. With the goal.

  In the method according to the present invention, the first belt end and the second belt end are joined together to obtain a joint belt. At least a part of the end surface of the first belt end is a belt width. The end face of the second belt end portion has a shape complementary to the first belt end portion, and is formed on a surface that is inclined or orthogonal to the direction. Both end surfaces of the belt end portion are abutted, the abutted portion is clamped in the belt width direction, and ultrasonic fusion is performed in the belt thickness direction to heat and melt and heat-seal.

  At least a part of the first belt end protrudes and is formed into a convex portion, and a concave portion having a shape complementary to the convex portion is formed at the second belt end portion, and the concave portion is formed in the convex portion. It is preferable to abut both end faces by fitting. And the outer peripheral wall of a convex part comprises the surface which inclines or orthogonally crosses with respect to the width direction mentioned above.

  The first belt end portion is formed in a finger shape by projecting the plurality of convex portions described above, and the second belt end portion is formed in a finger shape complementary to the first belt end portion. It is preferable. The convex portion is preferably formed to have a narrow width or a rectangular shape toward the tip.

  In the method of the present invention, the above-described ultrasonic vibration is given by, for example, an ultrasonic welder. Specifically, the belt is ultrasonically vibrated in the thickness direction by ultrasonic waves oscillated from the ultrasonic horn disposed above the belt in the thickness direction of the belt. In the present invention, for example, a pressurization mold including a base portion, a wall portion provided on the upper surface of the base, and a movable portion arranged to face the wall portion on the upper surface of the base is prepared. Then, a butt portion is placed between the wall portion of the upper surface of the base and the movable portion, the movable portion is displaced so as to approach the wall portion, and the butt portion is clamped by the movable portion and the wall portion.

  For example, the first belt end is one end of the belt, the second belt end is the other end of the belt, and the joining belt is an endless belt.

  According to the present invention, since the butt portion is joined by ultrasonic vibration while the butt portion is clamped in the width direction, the joining belt that ensures the flatness of the joint portion is obtained while improving the work efficiency. I can do it.

  The present invention will be described below with reference to the drawings. 1-5 is a figure for demonstrating the joint processing method of the belt which concerns on one Embodiment of this invention. 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 includes a base 11A having an upper surface 11U formed in a rectangular plane, and a side wall 11B provided on one end portion in the width direction W of the upper surface 11U, as shown in FIG. Formed into a letter. 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 attached to the base 11A by fastening screws 17E and 17F so that the movable member 12 can be displaced in the width direction W of the upper surface 11U, and the fastening screws 17E and 17F are guided by the guide grooves 11E and 11F, respectively. Displacement in the width direction W.

  A holding screw base 13 is fixed to the other end of the upper surface 11U in the width direction W. 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 long flat belt and has at least a thermoplastic resin layer. The belt 20 may be constituted by a single thermoplastic resin layer, or may be constituted by laminating a rubber layer, a canvas or the like in addition to the thermoplastic resin layer. The thermoplastic resin layer may be disposed on the belt surface, but may be disposed inside the belt to constitute, for example, a belt core.

  As shown in FIG. 3, an isosceles triangular convex portion 23 is formed at one end portion 21 of the belt 20 and protrudes in the longitudinal direction of the belt and has the same thickness as the other portions of the belt 20. Yes. A plurality of the convex portions 23 are continuously arranged in the belt width direction (two in the present embodiment), and one end portion 21 is formed in a finger shape. The other end 22 of the belt 20 is provided with a plurality of recesses 24 having the same shape complementary to the protrusions 23 in a continuous manner in the belt width direction, and the other end 22 is complementary to the one end 21. It is formed in a typical finger shape. That is, the end surfaces of both end portions 21 and 22 are complementary to each other, and when each convex portion 23 is fitted into each concave portion 24, the end surfaces of both end portions 21 and 22 are abutted. Both end portions 21 and 22 of the belt are each formed into a finger shape by being cut by a known cutting means.

  Each convex portion 23 extends in the longitudinal direction of the belt, and the length in the longitudinal direction is longer than the length in the width direction. Therefore, the adhesion area of the outer peripheral wall 23A of the convex portion 23 to the inner peripheral wall 24A of the concave portion 24 is increased. Can be increased. Moreover, since each convex part 23 is comprised by an isosceles triangle, 23 A of outer peripheral walls of each convex part 23 are comprised by two inclined surfaces which incline at the same angle with respect to the width direction of a belt. Therefore, all the outer wall 23A is uniformly pressed against the inner wall 24A by the clamping pressure in the width direction, which will be described later, and stable bonding can be realized. Furthermore, since each convex part 23 which consists of a triangle continues to the adjacent convex part 23, the end surface of the edge part 21 consists only of the surface (outer wall surface 23A) inclined with respect to the width direction, and the end surface of the edge part 22 ( The inner peripheral wall 24A) is easily pressed by the clamping pressure described later.

  Next, a process of manufacturing an endless belt from the long belt 20 will be described with reference to FIGS. In the present embodiment, as shown in FIG. 4, first, each convex portion 23 is fitted into the corresponding concave portion 24, and both end surfaces of the belt end portions 21 and 22 (that is, the outer peripheral wall 23 </ b> A and the inner peripheral wall 24 </ b> A). Butt. The butted portion B is placed on the upper surface 11U of the base 11A so as to be disposed between the side wall 11B and the movable member 12. At this time, the belt 20 is placed on the upper surface 11U such that one side surface 20A of the belt is in contact with 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, an ultrasonic horn 27 is disposed above the butted portion B as shown in FIG.

  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 11B, 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 holding screw 14 is further tightened from the held state, whereby the butted portion B of the belt 20 is pressed in the width direction of the belt, and the end surfaces of the belt end portions 21 and 22 (that is, the inner wall 23A and the inner wall 23A) The peripheral walls 24A) are pressed against each other.

  The butted portion B is sandwiched and subjected to ultrasonic vibration in the thickness direction of the belt by ultrasonic waves oscillated from the ultrasonic horn 27 in the thickness direction of the belt. Is done. That is, both end portions 21 and 22 are heat-melted in a state where the end surfaces are pressed against each other, and the end surfaces of the melted both end portions 21 and 22 are integrated. Thereafter, the ultrasonic oscillation is stopped, and the integrated end portions 21 and 22 are cooled, solidified, and fused, whereby the end portions 21 and 22 of the belt 20 are joined together to obtain an endless belt.

  In the present embodiment, in both cases where the belt is formed of a single thermoplastic resin and includes a canvas or a rubber layer in addition to the thermoplastic resin, the belt end portions 21 and 22 are caused by ultrasonic vibration. Only the thermoplastic resin is melted. The end faces of both end portions 21 and 22 are integrated and heat-sealed by the molten thermoplastic resin.

  As described above, in this embodiment, since the pressure is not applied to the heat-melted joint portion in the thickness direction, the thickness of the joint portion is prevented from becoming thinner than the thickness of other portions. The flatness of the belt is ensured. Further, when both ends of the heat-melted belt are joined, the belt is pressed in the width direction, so that a part of the melted belt can be prevented from flowing out from the joined portion in the belt width direction and generating burrs. Further, according to the ultrasonic vibration, the belt end portions 21 and 22 can be thermally melted in a short time, so that the working time for joining the belts can be greatly reduced.

  In the present embodiment, the ultrasonic wave is oscillated in the thickness direction of the belt, which is shorter than the width direction, and thus can be sufficiently propagated to the inside of the belt. Therefore, even when the thermoplastic resin layer is disposed only inside the belt, the thermoplastic resin layer can be melted and both end faces of the belt can be heat-sealed with high adhesive strength. Further, it becomes possible to join both end portions of a belt having any belt width.

  Further, in the present embodiment, both end portions 21 and 22 can be joined together by applying ultrasonic vibration in a sawtooth shape only to the butting portion B formed in a sawtooth shape when viewed from above. According to such a configuration, the melted portion due to ultrasonic vibration may be minimized, and changes in physical properties of the belt due to generation of burrs and melting can be minimized.

  In this embodiment, the shape of each convex part 23 is not limited to an isosceles triangle, and may be another triangle as long as it becomes narrower toward the tip, or may be other than a triangle. For example, each convex portion 23 has a right triangle, and the outer peripheral wall 23A of the convex portion 23 (that is, the end surface of the end portion 21) is formed only from a surface orthogonal to the width direction and a surface inclined with respect to the width direction. May be. 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. Furthermore, the convex part 23 may be formed in a rectangle long in the longitudinal direction of the belt. When a convex part 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. As described above, the end surfaces of the belt end portions 21 and 22 may include a surface orthogonal to the belt width direction or a surface parallel to the width direction.

  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. 23Y is formed, and the wide width portion 23Y becomes 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 any example of the convex portion, at least a part of the end surface of the one end portion 21 of the belt is inclined or orthogonal to the width direction, and the end surface of the one end portion 21 is the clamping pressure. This makes it easier to press against the end face of the other end 22. In particular, each of the convex portions described above is extended in the longitudinal direction of the belt, and the length in the longitudinal direction is longer than the length in the width direction. Can be inclined or orthogonal to the plane. Therefore, the majority of the areas of the end faces of the both end portions 21 and 22 of the belt can be pressed against each other by the clamping pressure in the belt width direction. In this way, the adhesive strength of the portion that is heat-sealed while the end faces are pressed against each other increases.

  Furthermore, in the said embodiment, although the convex part 23 and the recessed part 24 which are formed in the both ends 21, 22 respectively were provided with two or more, each may be only one.

  Further, the both end portions 21 and 22 do not have to be formed with the convex portion 23 and the concave portion 24. For example, as shown in FIG. 8, the both end portions 21 and 22 are respectively the same in the width direction. You may exhibit the shape cut | disconnected by the inclined surface L which inclines with an angle. That is, in the example of FIG. 8, the end surface 21K of one end portion 21 is formed of an inclined surface inclined with respect to the width direction, and the end surface 22K of the other end portion 22 is complementary to the first end surface 21K. It consists of an inclined surface of various shapes.

  In the example of FIG. 8, the first and second end faces 21K and 22K are brought into contact with each other so that both end portions 21 and 22 are abutted, and the butted portion of the belt is thermally fused by the same method as described above. Worn.

  Moreover, although the example of the flat belt was shown in the said embodiment, a belt is not limited to a flat belt, A toothed belt etc. may be sufficient. 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 the 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, for example, the end portion of the first belt and the end portion of the second belt formed separately from the first belt may be joined together to obtain a long joining belt. .

It is the top view which looked at the pressurization type | mold used for one Embodiment of this invention from upper direction. It is a side view of the pressurization type used for one embodiment of the present invention. It is a top view of the both ends of a belt. In one Embodiment of this invention, it is the top view which looked at a mode that the belt was mounted in the pressurization type | mold from the upper direction. It is a side view which shows a mode when a butt | matching part is heat-sealed. It is a top view which shows an 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 an example of the both ends of a belt.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Pressure type 11 Lower type | mold 12 Movable member 20 Belt 21 One edge part (1st belt edge part) of a belt
22 The other end of the belt (second belt end)
23 Concave part 24 Concave part 27 Ultrasonic horn B Butting part

Claims (7)

In a method of joining a first belt end and a second belt end to obtain a joint belt,
The end surface of the first belt end portion is at least partially with the also-out inclined with respect to the belt width direction are formed in the plane perpendicular to the end face of the second belt end portion of the first belt end Has a complementary shape to the part,
The both end surfaces of the first and second belt end portions are butted, and the butted portions are clamped in the belt width direction and ultrasonically vibrated in the belt thickness direction to heat and melt and heat-seal. And how to. At least a part of the first belt end protrudes to form a convex portion, and a concave portion having a shape complementary to the convex portion is formed on the second belt end portion, and the convex portion By fitting the concave portion, the both end surfaces are abutted,
The method according to claim 1, wherein the outer peripheral wall of the convex portion forms a surface that is inclined or orthogonal to the width direction.   The method according to claim 2, wherein the convex portion is formed with a narrow width or a rectangular shape toward the tip.   The first belt end portion is formed in a finger shape with a plurality of protrusions protruding, and the second belt end portion is formed in a finger shape complementary to the first belt end portion. 3. The method of claim 2, wherein:   A pressure mold comprising a base portion, a wall portion provided on the upper surface of the base, and a movable portion disposed on the upper surface of the base so as to face the wall portion is prepared, and movable with the wall portion of the upper surface of the base The said abutting part is mounted between parts, the said movable part is displaced so that the said wall part may be approached, and the said abutting part is pinched by the said movable part and the said wall part. the method of.   The first belt end is one end of the belt, the second belt end is the other end of the belt, and the joining belt is an endless belt. The method according to claim 1. The method according to claim 1, wherein the end surfaces of the first and second belt end portions are inclined surfaces inclined with respect to the width direction.

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