JP7454084B2 - Manufacturing method of energized belt - Google Patents

Description

The present invention relates to a method of manufacturing an energized belt that can be used to drive equipment such as an elevator up and down, for example.

Conventionally, a power feeding flat belt (current-carrying belt) for driving equipment such as a lifting device up and down has been disclosed in Patent Document 1, and in this power feeding flat belt, a conductor is used as a core wire. It is being On the other hand, in a toothed belt used for power transmission, the height position (PLD) of the core wire within the main body of the toothed belt is fixed, so the core wire is installed in a mold during the manufacturing process. It is supported by small protrusions. These small protrusions form elongated grooves extending in the width direction of the belt at the tooth bottoms of the toothed belt, thereby exposing the core wires.

Japanese Patent Application Publication No. 9-22621

When using a toothed belt as an electric current carrying belt, it is necessary to use a conductor as the core wire. However, in the case of a toothed belt, the core wire is exposed at the bottom of the teeth, and if moisture or oil, for example, gets on the bottom of the teeth, there is a risk of a short circuit. In addition, the meshing action of the toothed belt and the pulley causes stress concentration near the elongated groove at the bottom of the teeth, which makes the core wire prone to breakage, which causes the problem of bending fatigue.

SUMMARY OF THE INVENTION An object of the present invention is to provide a method for manufacturing a current-carrying belt that is free from short-circuiting and is less prone to bending fatigue.

The present invention comprises a first belt body made of a thermoplastic elastomer and having an adhesive surface, a conductive core wire disposed on the adhesive surface and extending in the longitudinal direction of the first belt body, and a thermoplastic elastomer. , a second belt main body portion that is bonded to the bonding surface so as to cover the conductive core wire, and has a tooth surface on the outer surface opposite to the bonding surface in which belt teeth and tooth bottom portions are alternately formed in the longitudinal direction; In the cross section of the current-carrying belt, a part of the conductive core wire is in close contact with the first belt main body part, the other part is in close contact with the second belt main body part, and the conductive core wire is in close contact with at least the tooth surface of the tooth surface. An energized belt that is completely covered at the bottom by a thermoplastic elastomer of a second belt body, the first belt body having a plurality of support grooves formed on the outer surface of the mold and extending parallel to the circumferential direction. After supplying the molten thermoplastic elastomer to the outer surface of the mold while engaging and supporting the conductive core wires, the thermoplastic elastomer is cooled and solidified while being pressed against the outer surface of the mold. It is characterized by being manufactured.

Preferably, the thermoplastic elastomer is non-conductive. Further, the thermoplastic elastomer is preferably a polyurethane thermoplastic elastomer or a polyester thermoplastic elastomer.

Preferably, the conductive core wire is a steel core wire. Further, it is preferable that the conductive core wire is embedded at a substantially central position in the thickness direction of the tooth bottom of the tooth surface of the belt body constituted by the first and second belt body parts.

The back surface of the belt opposite to the adhesive surface of the first belt main body is covered with a first conductive canvas, the tooth surface of the second belt main body is covered with a second conductive canvas, and the first belt main body is covered with a second conductive canvas. The conductive canvas and the second conductive canvas may be insulated from the conductive core wire.

According to the present invention, it is possible to obtain a method for manufacturing a current-carrying belt that is free from the risk of short-circuiting and is less likely to cause bending fatigue.

FIG. 1 is a perspective view showing a current-carrying belt according to a first embodiment of the present invention. FIG. 2 is a longitudinal cross-sectional view showing the current-carrying belt main body of the first embodiment and a conventional toothed belt. FIG. 2 is a cross-sectional view showing a belt slab obtained in the process of manufacturing an energized belt in the first embodiment. FIG. 2 is a cross-sectional view of the energizing belt of the first embodiment. It is a figure showing the primary molding process in the manufacturing method of the current carrying belt of a 1st embodiment. It is a longitudinal cross-sectional view showing a support groove formed in the first mold. FIG. 3 is a cross-sectional view of a primary molded product in the method for manufacturing a current-carrying belt according to the first embodiment. It is a figure showing the secondary molding process in the manufacturing method of the current carrying belt of a 1st embodiment. FIG. 2 is a cross-sectional view of a secondary molded product in the method for manufacturing a current-carrying belt according to the first embodiment. FIG. 7 is a perspective view showing a current-carrying belt according to a second embodiment. FIG. 7 is a longitudinal cross-sectional view showing a current-carrying belt according to a second embodiment. FIG. 3 is a cross-sectional view of a current-carrying belt according to a second embodiment. It is a figure which shows the primary molding process in the manufacturing method of the energizing belt of 2nd Embodiment. It is a figure which shows the secondary molding process in the manufacturing method of the energizing belt of 2nd Embodiment. FIG. 7 is a longitudinal cross-sectional view of a current-carrying belt according to a third embodiment. It is a figure which shows the manufacturing method of the energizing belt of 3rd Embodiment. FIG. 3 is a diagram showing an example of a configuration using a current-carrying belt. It is a figure which shows the 1st example of the structure which utilizes in combination the energizing belt. It is a figure which shows the 2nd example of the structure which utilizes in combination the energizing belt. It is a figure which shows the 3rd example of the structure which utilizes in combination the energizing belt.

EMBODIMENT OF THE INVENTION Hereinafter, with reference to illustrated embodiment, the energizing belt of this invention and its manufacturing method are demonstrated. FIG. 1 shows a current-carrying belt 10 according to a first embodiment. The current-carrying belt 10 is a toothed belt, and the belt main body 11 is molded from a thermoplastic elastomer such as urethane. In FIG. 1, the upper surface of the belt body 11 is a flat back surface 12, and the lower surface is a tooth surface in which belt teeth 13 and tooth bottoms 14 are alternately formed in the longitudinal direction of the belt body 11. Note that the lower surface can also be a flat surface. The energizing belt 10 in this case becomes a flat belt. A plurality of conductive core wires 15 are embedded within the belt body 11 and extend in the longitudinal direction thereof, and these conductive core wires 15 protrude from the end surface of the belt body 11.

The position of the conductive core wire 15 within the belt body 11 will be explained with reference to FIGS. 1 and 2. The conductive core wire 15 is embedded in the tooth bottom portion 14 at approximately the center in the thickness direction. Therefore, the conductive core wire 15 is covered with a highly insulating material (urethane) at the tooth bottom portion 14, as indicated by the symbol A in FIGS. 1 and 2(a). Furthermore, in the primary molding process, the conductive core wire 15 is molded in a state in which it is continuously engaged and supported by the support groove formed on the outer surface of the first mold, so that the core wire is less likely to break. In the secondary molding process, the position of the conductive core wire 15 draws an arcuate locus of a circle with a diameter of (outer diameter of the second mold + 2PLD).

On the other hand, in conventional toothed belts, as shown by the symbol B in FIG. 2(b), in the manufacturing process, small protrusions provided on the mold are used to form elongated grooves H extending in the belt width direction at the tooth bottoms. was formed, and the core wire C was exposed through this elongated groove H. The vicinity of this elongated groove H is the part where the conventional toothed belt is most likely to bend, stress is concentrated, and core wires are likely to break. Furthermore, since the core wire C is intermittently supported by spaced apart small protrusions provided on a mold during manufacturing of conventional toothed belts, the core wire is likely to break at locations where it is supported by the small protrusions. The position of the core wire C draws a regular n-gonal locus inscribed in a circle with a diameter of (outer diameter of the mold + 2PLD) during conventional production of toothed belts. Note that n is the number of small protrusions on the mold.

FIG. 3 shows a cross section of a belt slab 20 obtained in the process of manufacturing the current-carrying belt 10. The conductive core wires 15 are basically provided at regular intervals in the width direction of the belt, but in some areas, the distance between adjacent conductive core wires 15 is set relatively wide. The portion where the conductive core wires 15 are widely spaced is a slit lane S1 that is formed by not providing the conductive core wires 15 in the manufacturing process. The slab portion S2, in which the conductive core wires 15 are provided at regular intervals, is cut at the slit lane S1 in a subsequent step, thereby forming the current-carrying belt 10 as shown in FIG. Note that the configuration of the energizing belt 10 will be described in detail later.

A method of manufacturing the current-carrying belt 10 of this embodiment will be described with reference to FIGS. 5 to 9.
This manufacturing method basically consists of a primary molding process and a secondary molding process. The manufacturing apparatus for carrying out the primary molding process includes a first mold 30, an extrusion molding machine 31, and a press machine 32, as shown in FIG. The first mold 30 rotates around an axis (perpendicular to the paper surface), and the rotation direction is clockwise in FIG. 5. Support grooves 33 are formed at regular intervals on the outer surface of the first mold 30, as shown in FIG. These support grooves 33 engage the conductive core wire 15, and are annular grooves extending in parallel over the entire circumference of the first mold 30. Further, the cross section of the support groove 33 is an arcuate shape corresponding to the cross-sectional shape of the conductive core wire 15.

The extrusion molding machine 31 is disposed above the first mold 30 and applies a thermoplastic material such as molten urethane to the surface of the first mold 30 with the conductive core wire 15 engaged with the support groove 33. Extrude and feed the elastomer. The pressing machine 32 has a steel belt 34 wrapped around a plurality of rollers 35, and the steel belt 34 presses and cools the molten thermoplastic elastomer supplied from the extrusion molding machine 31 to the surface of the mold 30. Let solidify. The steel belt 34 is provided so as to cover the first mold 30 over a range of about 180° or more from the downstream side of the extrusion molding machine 31.

The conductive core wires 15 are unwound one by one from the roll 36, applied with tension by the tension adjuster 37, and guided to the first mold 30 via the guide rollers 38. A reed (not shown) is provided between the guide roller 38 and the first mold 30, and one conductive core wire 15 is inserted between the many comb-shaped reed blades formed on the reed. It is passed through one by one and separated, then fitted into the support groove 33 of the first mold 30 and wound up. Note that the conductive core wire 15 is not passed through the gaps between the predetermined reed blades in the reed because slit lanes S1 (see FIG. 3) are formed.

A primary molded product A1 formed by the steel belt 34 of the press 32 and the first mold 30 is guided by a guide roller 39 and wound onto a take-up roll 40. FIG. 7 shows a cross section of the primary molded product A1. In other words, the primary molded product A1 is one in which a plurality of conductive core wires 15 are bonded at regular intervals to the surface of a band-shaped thermoplastic elastomer portion P, and each conductive core wire 15 is half of the cross section. is exposed from the thermoplastic elastomer portion P. Further, as described above, since the conductive core wire 15 is not supplied to the support groove 33 corresponding to the slit lane S1, the primary molded product A1 has a raised portion R with an arcuate cross section corresponding to the conductive core wire 15. is formed.

The primary molded product A1 is sent to the secondary molding process in a rolled up state. As shown in FIG. 8, the manufacturing device for performing the secondary molding process is basically the same as the manufacturing device for the primary molding process (see FIG. 5), but instead of the first mold 30. A second mold 41 is used. The second mold 41 rotates around its axis (perpendicular to the paper surface), and the rotation direction is clockwise in FIG. 8 . On the outer surface of the second mold 41, unlike the support grooves 33 in FIG. 6, tooth profiles extending parallel to the axial direction are formed at regular intervals. These tooth profiles are for molding the tooth profile of a toothed belt, and are basically the same as the configuration provided in conventionally known toothed belt manufacturing equipment. No small protrusions are provided for fixing the height position (PLD) of the core within the main body of the belt.

Since the conductive core wire 15 is not supplied in the secondary molding process, the roll 36, tension adjuster 37, guide roller 38, and reed (not shown) are not used. The take-up roll 40 of the primary molded product A1 is set on a predetermined support device, and the primary molded product A1 is in a state where the surface on which the conductive core wire 15 is provided faces outward (upper side in FIG. 8). Then, it is guided to the second mold 41 via a guide roller 42 and a tension roller 43. That is, a slight tension is applied to the primary molded product A1 by the tension roller 43 so that it does not meander in the direction of movement toward the second mold 41. The primary molded product A1 is supported by the steel belt 34 with the surface on which the conductive core wire 15 is provided facing the second mold 41, and is molded into the second mold by the extrusion molding machine 31. A molten thermoplastic elastomer such as urethane is extruded and supplied between the mold 41 and the primary molded product A1.

As in the primary molding step, the presser 32 cools the molten thermoplastic elastomer supplied between the primary molded product A1 and the outer surface of the mold 41 while pressing it toward the outer surface of the mold 41. The thermoplastic elastomer is solidified to obtain a secondary molded product A2. This secondary molded product A2 is guided by a guide roller 39, after which an unnecessary part of the side surface is cut off by a trim machine (not shown), and then wound around a winding roll 44 as a belt slab 20 (see FIG. 3). taken. FIG. 9 shows a cross section of the secondary molded product A2. That is, the secondary molded product A2 is a flat part of the thermoplastic elastomer portion Q in which belt teeth 13 and tooth bottoms 14 (see FIG. 1) are alternately formed on the surface of the primary molded product A1 on the conductive core wire 15 side. H is glued (welded).

As described above, in the primary molding process, the plurality of conductive core wires 15 are supplied to the first mold 30 so as to be engaged with the plurality of support grooves 33, and the extrusion molding machine 31 melts them. After supplying the thermoplastic elastomer, the thermoplastic elastomer is cooled and solidified while being pressed against the outer surface of the first mold 30, thereby producing a primary molded product A1. In the secondary molding step, while supplying the primary molded product A1 to the second mold 41, a gap is formed between the second mold 41 and the surface of the primary molded product A1 on the conductive core wire 15 side. After supplying the molten thermoplastic elastomer, the thermoplastic elastomer is pressed against the outer surface of the second mold 41 while being cooled and solidified to produce the secondary molded product A2. Both sides of the secondary molded product A2 are cut off by a trim machine to have a predetermined width, and then wound onto a winding roll 44 as a belt slab 20.

In a subsequent step, the belt slab 20 is cut at the slit lane S1, thereby obtaining the energized belt 10 with a predetermined width (for example, 15 mm).

Referring again to FIG. 4, the configuration of the energizing belt 10 will be described in detail. The current-carrying belt 10 has first and second belt main bodies 51 and 52 made of thermoplastic elastomer, and a plurality of conductive core wires 15. The first belt body 51 has an adhesive surface 53, and the conductive core wires 15 are arranged on the adhesive surface 53 and extend parallel to each other in the longitudinal direction of the first belt body 51. The second belt body part 52 is adhered (welded) to the adhesive surface 53 so as to cover the conductive core wire 15, and the belt teeth 13 and the tooth bottom part 14 are formed in the longitudinal direction on the outer surface opposite to the adhesive surface 53. are formed alternately (see Figure 1). The conductive core wire 15 is located approximately at the height position in the thickness direction of the tooth bottom portion 14 of the belt body 11 composed of the first and second belt body portions 51 and 52.

As described above, according to the present embodiment, in the current-carrying belt 10 of the toothed belt, the conductive core wire 15 is completely covered with thermoplastic elastomer, and the tooth bottom portion 14 has a slender elongated belt like a conventional toothed belt. There are no grooves. Therefore, there is no risk that the conductive core wire 15 will be short-circuited, and since the core wire will not break or stress concentration will occur during use, bending fatigue will be less likely to occur, and the durability of the current-carrying belt 10 will be improved. Further, the height position of the conductive core wire 15 within the belt body 11 can be easily adjusted by controlling the thickness of the thermoplastic elastomer portions P and Q in manufacturing the current-carrying belt 10.

10 to 12 show a current-carrying belt 60 according to a second embodiment. The difference from the first embodiment is that the back surface 12 and tooth surfaces of the belt main body 11 are covered with conductive canvas 61, 62, and the other configurations are the same. That is, the back surface 12 of the belt opposite to the adhesive surface 53 of the first belt main body 51 is covered with the first conductive canvas 61, and the tooth surface of the second belt main body 52 is covered with the second conductive canvas. It is covered with a canvas 62. The first conductive canvas 61 and the second conductive canvas 62 are insulated without contacting the conductive core wire 15 embedded in the belt body made of a non-conductive thermoplastic elastomer.

In the current-carrying belt 60, both sides of the belt body 11 are covered with the first and second conductive canvases 61 and 62, respectively, so even when the conductive core wire 15 is used as a signal line, low-frequency electromagnetic waves are prevented. It is possible to reduce the noise due to

FIG. 13 shows the primary molding step in the method for manufacturing the current-carrying belt 60 of the second embodiment. This primary molding step is basically the same as the first embodiment, and the first conductive canvas 61 is supplied between the extrusion molding machine 31 and the roller 35 of the pressing machine 32 along the direction of arrow B1. The points are different. That is, the first conductive canvas 61 is supplied between the molten thermoplastic elastomer supplied by the extrusion molding machine 31 and the steel belt 34 of the pressing machine 32, thereby causing the first conductive canvas 61 to be formed on the back side of the first molded product A1. A conductive canvas 61 is adhered.

FIG. 14 shows a secondary molding step in the method for manufacturing the energizing belt 60 of the second embodiment. This secondary molding process is basically the same as the first embodiment, and a second conductive canvas 62 is placed between the extrusion molding machine 31 and the outer surface of the second mold 41 along the direction of arrow B2. They differ in the way they are supplied. That is, the second conductive canvas 62 is supplied between the molten thermoplastic elastomer supplied by the extrusion molding machine 31 and the outer surface of the second mold 41, and thereby the tooth surface side of the second molded product A2. A second conductive canvas 62 is adhered to.

Note that the first and second conductive canvases 61 and 62 may be made of the same material or may be made of different materials.

FIG. 15 shows a current-carrying belt 70 according to a third embodiment. This current-carrying belt 70 is a double-toothed belt, and belt teeth 13 and tooth bottom portions 14 are alternately formed on both sides of the belt body 11. In order to form tooth profiles on both sides, primary to tertiary molding steps are performed as described below.

FIG. 16 shows a method of manufacturing a current-carrying belt according to the third embodiment. The manufacturing method of the third embodiment includes a primary molding process, a secondary molding process, and a tertiary molding process. As shown in FIG. 16(a), the primary molding process is the same as in the first embodiment. The primary molded product A1 obtained in the primary molding step has the configuration shown in FIG. 7, and is molded into a tooth profile in the secondary molding step shown in FIG. 16(b). In the secondary molding process, the first mold 30 is replaced with a second mold 41. The second mold 41 has the same configuration as the first embodiment described with reference to FIG. 8, and tooth profiles extending parallel to the axial direction are formed at regular intervals on its outer surface.

Similar to the first embodiment, the conductive core wire 15 is not supplied in the secondary molding process, so the roll 36, tension adjuster 37, guide roller 38, and reed (not shown) are not used. The primary molded product A1 is guided to the second mold 41 via the guide roller 42 and the tension roller 43 with the surface on which the conductive core wire 15 is provided facing outward. Then, the extrusion molding machine 31 extrudes and supplies molten thermoplastic elastomer such as urethane between the second mold 41 and the primary molded product A1, and the action of the second mold 41 and the steel belt 34 The thermoplastic elastomer is solidified and a secondary molded product A2 is obtained. The secondary molded product A2 is wound up on a winding roll 44, and its configuration is the same as that shown in FIG.

In the tertiary molding process, similarly to the secondary molding process, a tooth profile is molded on the back surface (the surface on which the tooth profile is not formed) of the secondary molded product A2 with the second mold 41 attached. That is, the secondary molded product A2 is guided to the second mold 41 via the guide roller 42 and the tension roller 43 with the back surface facing outward. Then, the extrusion molding machine 31 extrudes and supplies molten thermoplastic elastomer such as urethane between the outer surface of the second mold 41 and the secondary molded product A2, and the second mold 41 and the steel belt 34 The thermoplastic elastomer is solidified by the action of , and a tertiary molded product A3 is obtained. While being guided by the guide rollers 39, this tertiary molded product A3 is wound up onto the take-up roll 45 after unnecessary portions of the side surfaces are cut off by a trim machine (not shown).

In the third embodiment, the phases of the tooth profiles formed on both sides of the energizing belt 70 must match, so it is necessary to synchronize the second mold 41 and the guide roller 42.

FIGS. 17(a) and 17(b) show an example in which the current-carrying belt of any one of the first to third embodiments is used as part of a system for driving movable racks in, for example, an automated warehouse. In this example, at least a portion of the energizing belt 10 is accommodated within a square pipe 71 that is a guide member, and is engaged with a toothed pulley 72 within the square pipe 71. A first clamp 73 is attached to the square pipe 71, and one end of the energizing belt 10 is connected to the first clamp 73. The other end of the energizing belt 10 protrudes from the square pipe 71 and is connected to a second clamp 74 fixed to a movable rack (not shown).

The conductive core wire 15 (see FIG. 1) of the current-carrying belt 10 is connected to a control unit (not shown), and the movable rack is driven by a command signal or electric power transmitted or supplied via the conductive core wire 15. be done. 17(a) shows a state where the second clamp 74 and the movable rack are relatively displaced to the right, and FIG. 17(b) shows a state where the second clamp 74 and the movable rack are relatively displaced to the left. Indicates a displaced state.

18 to 20, similar to FIG. 17, show configuration examples when the energizing belt 10 is used in an automated warehouse or the like.
In FIG. 18, the back sides of two energizing belts 10, 10 are brought together and both ends are fixed with clamps 73, 74, respectively. That is, a gap is formed between the current-carrying belts 10 and 10, and the belts are fixed to the clamps 73 and 74 so that they can be displaced relative to each other. A tooth profile corresponding to the tooth surface of the energizing belt 10 is formed on the inner surface of each clamp 73, 74 that engages with the energizing belt 10, 10. Since the outer energizing belt 10 is easily bent, it is preferable to provide a flange or a guide member to suppress the bending. Further, in order to reduce the deflection of the outer energizing belt 10, it is preferable to finely adjust the attachment position of the outer energizing belt 10 with respect to the clamps 73 and 74. Furthermore, in order to reduce wear due to contact between the back surfaces of the two energizing belts 10, it is preferable to cover the back surfaces with canvas.

19 is similar to the example shown in FIG. 18 in that the back sides of two energizing belts 10, 10 are brought together and both ends are fixed with clamps 73, 74, respectively, but the length of the inner energizing belt 10 is set to the length of the outer energizing belt 10. It is fixed to the clamps 73 and 74 so as to have a much shorter span than the energized belt 10. Furthermore, the flat pulley 76 around which the outer current-carrying belt 10 is wound is relatively large compared to the toothed pulley 72 around which the inner current-carrying belt 10 is wound. Thereby, the span can be adjusted so that a predetermined tension is applied to each of the energizing belts 10, 10.

FIG. 20 shows an example of a configuration in which three energizing belts 10, 77, and 10 are combined. That is, this is an example in which a current-carrying belt 77 having no teeth is provided between two current-carrying belts 10, 10 shown in FIG. It is preferable that the portions where these energizing belts 10, 77, 10 are fixed to the clamps 73, 74 be fused by, for example, hot press to prevent positional displacement. In the secondary molding step, the intermediate energizing belt 77 may be molded by using a smooth cylindrical mold with no teeth on the surface or by cutting the teeth of the secondary molded product.

13 Belt tooth 14 Tooth bottom 15 Conductive core wire 51 First belt main body 52 Second belt main body 53 Adhesive surface

Claims (6)

a first belt body made of thermoplastic elastomer and having an adhesive surface;
a conductive core wire disposed on the adhesive surface and extending in the longitudinal direction of the first belt main body;
A tooth surface made of a thermoplastic elastomer, which is bonded to the bonding surface so as to cover the conductive core wire, and has belt teeth and tooth bottoms alternately formed in the longitudinal direction on the outer surface opposite to the bonding surface. a second belt main body having a
In a cross section of the current-carrying belt, a part of the conductive core wire is in close contact with the first belt main body, and another part is in close contact with the second belt main body, and at least the teeth of the tooth surface are in close contact with the first belt main body. An energized belt completely covered at the bottom by the thermoplastic elastomer of the second belt body,
The first belt main body is fused to the outer surface of the mold, with the conductive core wires being engaged and supported by a plurality of support grooves formed on the outer surface of the mold and extending parallel to the circumferential direction. 1. A method of manufacturing a current-carrying belt, comprising supplying a thermoplastic elastomer, and then cooling and solidifying the thermoplastic elastomer while pressing it against the outer surface of the mold. The method for manufacturing a current-carrying belt according to claim 1, wherein the thermoplastic elastomer is non-conductive. 3. The method of manufacturing a current-carrying belt according to claim 1, wherein the thermoplastic elastomer is a polyurethane thermoplastic elastomer or a polyester thermoplastic elastomer. The method for manufacturing a current-carrying belt according to claim 1, wherein the conductive core wire is a steel core wire. Claim 1, wherein the conductive core wire is embedded at a substantially central position in the thickness direction of the tooth bottom of the tooth surface of the belt main body constituted by the first and second belt main parts. The method for manufacturing the energized belt described in . A back surface of the belt opposite to the adhesive surface of the first belt main body is covered with a first conductive canvas, a tooth surface of the second belt main body is covered with a second conductive canvas, 6. The method of manufacturing a current-carrying belt according to claim 5, wherein the first conductive canvas and the second conductive canvas are insulated from the conductive core wire.

Images