JP5064741B2 - Transmission belt manufacturing method - Google Patents

Description

  The present invention relates to a method of manufacturing a power transmission belt (V-belt) having a belt side surface accurately cut.

  In general, a V-belt, which is a transmission belt, is manufactured by forming a belt sleeve and vulcanizing it, and then cutting it into a trapezoidal shape. In this case, the manufactured V-belt generally has errors in the length and cross-sectional shape of each belt due to thermal contraction of the constituent materials, position displacement of the core wire, and processing errors during cutting. In particular, if there is variation in the cross-sectional dimensions of the belt, when the V-belt is fitted in the pulley groove, the position of the belt fluctuates in the radial direction with respect to the pulley axis. Fluctuated, causing machine vibration.

  Further, Patent Document 1 discloses a belt traveling unit that stretches and rotates a belt on a driven pulley that moves along a driving pulley and a guide rod, and a belt processing unit that includes a rotatable cutting blade that cuts the side surface of the belt. Using a device consisting of a push roll that presses the back of the belt being processed, the belt is stretched around the belt running part, and the pair of cutting blades are rotated after the push roll is brought into contact with the back of the belt. Thus, it is disclosed to form a V-belt.

  Furthermore, in Patent Document 2, when the belt sleeve is cut into a ring shape, cutting is performed in a state where both edge portions of the wide-width portion of the cross-sectional shape of the transmission belt are overlapped, so that waste of material material can be greatly reduced. It is disclosed.

  However, in any of the above methods, since the belt side surface is finished with a pair of cutting blades (Patent Document 1), a large amount of ring-shaped cut scraps, cutting scraps or abrasive scrap scraps are generated. It was. For this reason, a countermeasure for reducing this scrap has been strongly desired. Further, a belt whose surface has been polished has a large amount of wear, and heat generated by belt slip tends to increase.

  Furthermore, in Patent Document 2, it is cut in a state in which both edge portions of the wide-width portion of the cross-sectional shape of the transmission belt are overlapped, and waste of material material can be saved, but the overlap portion eventually becomes scrap. In view of reducing the amount of scrap, there is still room for improvement.

However, recently, a method for manufacturing a transmission belt that reduces scrap (cut waste) in the belt manufacturing process has been proposed. In this method, as described in Patent Document 3, a transmission belt that cuts a belt having a rectangular cross-section laminated and integrated so as to interpose a core wire between a compression rubber layer and an extension rubber layer to a bias is manufactured. Is the method.
Japanese Patent Publication No. 4-2525 JP 55-28883 A Japanese Patent Laid-Open No. 2006-200732

  However, in Patent Document 3, it is possible to separate a pair of left and right ring debris separated from the belt side at the time of cutting, but depending on the sharpness of the cutter blade, the ring debris does not separate from the belt and runs on the back of the belt Occasionally, a phenomenon occurs. When this phenomenon occurs, the balance is lost due to the deviation of the center of gravity of the belt, so that the side surface of the belt is damaged when the cutter blade is retracted, and the belt may be defective.

  The present invention has been made in view of the above circumstances, and provides a method for manufacturing a transmission belt capable of cutting a belt side surface with high accuracy and reducing scrap (cut waste) in a belt manufacturing process. Objective.

The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described. That is, the invention described in claim 1 of the present application is a method for manufacturing a transmission belt, in which a belt having a rectangular cross section laminated and integrated so that a core wire is interposed between a compression rubber layer and an extension rubber layer is cut to a bias. The belt having the rectangular cross section is stretched over at least two shafts having a large diameter portion on both sides of the small diameter portion so that the compressed rubber layer is sandwiched between the large diameter portions, and tension is applied to the belt. In the manufacturing method of the transmission belt, the cutter is caused to enter the bias direction along the cut line of the compressed rubber layer while being moved, and is retracted along the return path so as not to touch the compressed rubber layer from the cut line. Yes, after the cutter cuts in the bias direction, it can cut accurately without damaging the belt side by making the trajectory of the return route deviate from the original cut line. Kill. Furthermore, it is possible to prevent the ring-shaped cut waste from loosening and rampage during cutting, and the cut waste can be recovered stably.

The invention according to claim 2 of the present application is a method for manufacturing a transmission belt, in which a belt having a rectangular cross section laminated and integrated so as to interpose a core wire between a compression rubber layer and an extension rubber layer is cut to a bias. The belt having the rectangular cross section is stretched over at least two shafts having a large diameter portion on both sides of the small diameter portion so as to sandwich the compression rubber layer between the large diameter portions,
While pressing at least one of the tension side and the slack side of the belt by a push roll, the belt side surface is sandwiched by a guide roll,
While running while applying tension to the belt, the cutter enters the bias direction along the cut line of the compressed rubber layer pressed by the push roll, and does not come out of the cut line and touch the compressed rubber layer. Retreat along a long return route,
This is a transmission belt manufacturing method, which can reduce the occurrence of belt defects without damaging the side of the belt during cutting, and can also prevent ring-shaped cutting waste generated during cutting from loosening and rampaging. Therefore, the cut waste can be recovered stably.

As described above, in the invention according to the claims of the present application, after cutting with the cutter, the path of the return route is deviated from the original cutting line, thereby accurately cutting the bias side without damaging the side surface of the belt. This can reduce the occurrence of belt defects.
Further, it is preferable that the ring-shaped cutting waste generated by the cutting travels on the peripheral surface of the large-diameter portion, thereby preventing the ring-shaped cutting waste generated at the time of manufacture from loosening and unraveling. Therefore, the cut waste can be recovered stably.

Embodiments of the present invention will be described below with reference to the accompanying drawings.
As shown in FIG. 1, the above-mentioned reinforcement is obtained by cutting both ends of the unvulcanized compressed rubber sheet 55 having a predetermined thickness in advance with a predetermined thickness inclined in the thickness direction. After the cloth 40 is wound around the mold 41 and the cut surfaces are abutted, the surface of the cut surface is lightly pressed with a pressure jig (not shown) and jointed, and further using a heating press (not shown). The joint portion 58 is formed by heating and pressing. The heating and pressing conditions are a temperature of 80 to 120 ° C., a surface pressure of 1 to ² kg / cm ² , and a time of 10 to 30 seconds. In addition, normally, the position of the joint part 58 shall be performed by the groove-shaped part 43 of the mold 41. FIG. When the position of the joint comes to the projecting portion 42, the joint comes to the belt cog valley portion, and cracking is likely to occur.

  Next, a resin film made of polymethylpentene or polyethylene terephthalate, which is an anti-adhesive agent 56, and having excellent heat resistance and releasability is wound on the surface of the compressed rubber sheet 55 and bonded together. The process proceeds to the step of molding the sheet 55.

  A vulcanizing can can be used in the rubber sheet molding step. In this case, after covering the rubber jacket 57, which is the blocking material, on the outside of the anti-adhesive agent 56, this is installed in a vulcanizing can, and the temperature is 160 to 180 ° C. and the external pressure is only 0.8 to 0.9 MPa. Molding is performed for about 5 to 10 minutes to form an unvulcanized compressed rubber layer 60 as shown in FIG. Even if it molds with a vulcanizing can, the crack of the joint part 58 of the compression rubber layer 6 does not occur. Needless to say, the vulcanization can is not used for molding, and the outside of the compressed rubber sheet 55 can be heated and pressurized by a pressure band, a press method or the like.

  FIG. 3 shows a state in which a belt molded body is produced on the surface of a molded rubber sheet for compression rubber, and the mold 41 having the compression rubber layer 60 formed thereon as described above is attached to a molding machine (not shown). A core wire 61 made of a cord such as polyester fiber, aramid fiber, glass fiber or the like is wound around a compression rubber layer 60 in a spiral, and then an adhesive rubber sheet 62 that forms an adhesive rubber layer, and an elastic rubber sheet that forms an extension rubber layer 63 and the upper surface reinforcing cloth 64 are sequentially wound to manufacture the belt molded body 65. And the mold 41 taken out from the molding machine is installed on a support stand, and a jacket (not shown) is inserted.

  Then, the belt molded body 65 is transferred to a vulcanizing can and vulcanized by an ordinary method. After vulcanization, the jacket and then the cylindrical belt sleeve are removed from the mold 41.

  Next, the belt sleeve is mounted on the mantle, cut at right angles to a predetermined width by a cutter, and finished into a single belt 70 having a rectangular cross section as shown in FIG. Then, this single belt 70 is set in the bias cutting device 100 shown in FIG. 5 and is cut into a bias by a pair of cutters 90 and 90 to remove ring dust and finish the power transmission belt 1.

  As shown in FIG. 5, the bias cut device 100 includes a drive shaft 80 and a driven shaft 82 that are parallel to each other and that can stretch the belt 70 having a single rectangular cross section. The drive shaft 80 is connected to a motor (drive unit) 81 such as a motor, and is rotated by receiving a driving force from the motor 81 so that the belt 70 can travel.

  The drive shaft 80 and the driven shaft 82 are both supported in a cantilevered manner, and a base shaft 86 having a large diameter portion (fixed side flange) 83a and a small diameter portion 84 on the end side thereof, and the base shaft 86 A slide cylinder 83b as a large-diameter portion (movable flange) that is externally fitted to the small-diameter portion 84 so as to be slidable in the axial direction and has the same outer diameter as the large-diameter portion 83a. Yes. That is, the shafts 80 and 82 have large-diameter portions 83a and 83b arranged on both sides of the small-diameter portion 84, and a groove (accommodating groove) is formed in the small-diameter portion 84 between the large-diameter portions 83a and 83b. It is a simple shape. Note that the corners of the large diameter portions 83a and 83b are slightly cut off at the boundary portions between the large diameter portions 83a and 83b and the small diameter portion 84 to form a fillet R having an arcuate cross section.

  The driven shaft 82 is configured to be movable in a direction toward and away from the drive shaft 80 as indicated by an arrow in FIG. 5, and applies tension to the belt 70 and facilitates installation and removal of the belt 70. I have to. The large-diameter portions 83a and 83b of the drive shaft 80 and the driven shaft 82 are provided so as to face each other, and one large-diameter portion 83a is fixed to each shaft 80 and 82, and a slide cylinder as the other large-diameter portion. 83b moves on the outer peripheral surface of the small diameter portion 84, narrows the width (interval of the accommodation groove) of the small diameter portion 84, and clamps the belt 70. The slide cylinders (movable flanges) 83b of the shafts 80 and 82 can be moved in synchronization by using, for example, compressed air or hydraulic means.

  In the cutting operation, first, as shown in FIG. 5, the slide cylinder 83 b is slid in the direction away from the large diameter portion 83 a on the drive shaft 80 and the driven shaft 82. Also, one of the guide rolls 87 b is moved in a direction away from the other side.

  Next, the belt 70 having a rectangular cross section is hung on the portion (accommodating groove) of the small diameter portion 84 of both shafts 80 and 82. Thereafter, as shown by the arrow in FIG. 5, the slide cylinder 83 b is slid toward the large diameter portion 83 a and is brought into contact with the other side surface of the belt 70. In this way, the belt 70 is stretched between the two shafts 80 and 82 in a state where the belt 70 (the compressed rubber layer 6) is sandwiched between the two large diameter portions 83a and 83b (the housing groove). be able to. In the cut regions 88 and 88, as shown by the arrows in FIG. 5, the one-side roll 87b is moved so as to approach the other-side roll 87a, and the belt 70 is sandwiched between the two rolls 87a and 87b. To do.

  After the belt 70 is set in the bias cut device 100 in this way, the motor 81 is driven to run while applying tension to the belt 70 as shown in FIGS. The cutter 90 is made to enter the bias direction of the angle β along the cut line a with respect to the compressed rubber layer 6 of the belt 70 pressed by the push roll 85, and the cut waste 91 is separated. The angle β of the bias cut surface 15 can be set to an appropriate angle within a range of 20 to 60 °, for example. Then, after that, the cutter 90 is retracted. At this time, the cutter 90 is retracted so as not to touch the compressed rubber layer 6 on the return path b that is out of the cut line a. (Figs. 8 and 9)

  The return route b is on a line starting from the end point of the cut line a and moving backward from the cut line a at an angle. The angle between the return route b and the cut line a is not particularly limited, but is in the range of 1 to 20 °.

As a result, the side surface 71 on the one side and the side surface 71 on the other side of the belt 70 are cut obliquely, and depending on the sharpness of the cutter blade, the ring scrap does not separate from the belt and runs on the belt back surface. Even if this occurs, the bias cut surface 15 can be formed with high accuracy without a loss of balance as in the case of a step cut without causing a loss of balance.
In the cut regions 88 and 88, the belt 70 is pressed by the push roll 85 and the side surfaces are sandwiched by the guide rolls 44 and 44, so the escape of the belt 70 when entering the cutter 90 is prevented. Thus, the power transmission belt 1 having a V-shaped cross section is completed.

  The side portion of the belt 70 cut off by the cutter 90 is separated from the belt 70 as a pair of left and right ring-shaped cut scraps 91 and 91. The cut scraps 91 and 91 are separated from the small diameter portion 84 immediately after the separation. It is naturally pushed out (it is considered to be pushed out by the component force of the pressing force or the wedge shape at the tip of the cutter 90) and is on the outer peripheral surface of the large-diameter portions 83a and 83b of the drive shaft 80 and the driven shaft 82. It will fall down and will be in the state hung between large diameter part 83a * 83b.

  Since the fillet R is provided at the corners of the large diameter portions 83a and 83b as described in FIG. 5, the cut scrap 91 separated from the belt 70 moves smoothly to the large diameter portions 83a and 83b. Done. As shown in FIG. 7 and FIG. 10, the cut scraps 91 and 91 travel with the belt 70 in a state where appropriate tension is applied. Does not cause a bad influence on the power transmission belt 1. Further, since the cut scraps 91 and 91 continue to travel stably at fixed positions on the large diameter portions 83a and 83b, the cut scraps 91 and 91 can be easily and stably recovered.

When the cutting is finished, the rotation of the drive shaft 80 is stopped, and the movable roll 87b and the slide cylinder 83b among the push roll 85, the cutter 90, and the guide roll 87 are returned to their original positions, and the driven shaft 82 is also moved. The belt tension is released by moving to the drive shaft 80 side, the belt 70 and the cut waste 91 are taken out, and the molding is finished.
The above configuration can be further modified as follows.

  The single belt 70 is not limited to the compression rubber layer 6 provided with the cog portions 9 in which the cog valley portions 7 and the cog mountain portions 8 are alternately arranged along the belt longitudinal direction at a constant pitch. The stretched rubber layer 5 may be a double cogged belt provided with a similar cog portion. Further, it may be used for bias cutting of a low edge belt in which the cog portion 9 is omitted.

  The push rolls 85 in the cut regions 88 and 88 are arranged so as to press the back surface of the belt 70 in the above embodiment, but may be arranged so as to press the opposite side (cog portion 9 side).

  The pair of cutters 90 may enter the compressed rubber layer 6 at the same time, or may enter with a time difference.

  In the present embodiment, in the bias cut device 100 described above, the push roll 85 and the guide roll 87 may not be used if the tension of the belt 70 is increased.

It is a figure which shows the process of heat-pressing the sheet | seat for compression rubbers, and sticking and sticking to the protrusion part and groove part of a mold. It is a figure which shows the state which shape | molded the sheet | seat for compressed rubber. It is a figure which shows the state which produced the surface belt molded object of the type | molded sheet | seat for compressed rubber. It is sectional drawing of the belt which has a rectangular cross section obtained by cutting a belt sleeve at right angles to predetermined width with a cutter. It is the elevation surface schematic diagram which showed the whole structure of the bias cut apparatus. In a bias apparatus, it is a figure which shows a mode that a bias cut is carried out to a side surface, running a belt. It is an elevation model which shows a mode that the both sides | surfaces of the belt were cut and the belt waste was isolate | separated. It is sectional drawing equivalent to the XX sectional arrow of FIG. 7 which shows a mode that a cutter is approached to a belt and is made to retract. It is sectional drawing equivalent to the YY section arrow of FIG. 7 which shows a mode that a cutter is approached to a belt and it is made to retract. It is a perspective view which shows a mode that cut waste is hung on the large diameter part of a drive shaft after a cut, and it drive | works with a power transmission belt.

Explanation of symbols

6 Compressed rubber layer 14 Bottom surface of compressed rubber layer 15 Bias cut surface 16 Short fiber 17 End surface of short fiber 70 Belt of rectangular section 71 Belt side surface 80 Drive shaft 82 Drive shaft 83a Large diameter portion 83b Slide cylinder (large diameter portion)
84 Small-diameter portion 85 Push roll 87 Guide roll 90 Cutter 91 Cut waste 100 Bias cut device a Cut line b Return line

Claims (2)

A method of manufacturing a power transmission belt that cuts a rectangular cross-section belt laminated and integrated so as to interpose a core wire between a compression rubber layer and an extension rubber layer,
The belt having the rectangular cross section is stretched over at least two shafts having a large diameter portion on both sides of the small diameter portion so that the compressed rubber layer is sandwiched between the large diameter portions,
While running while applying tension to the belt, the cutter enters the bias direction along the cut line of the compressed rubber layer, and moves back along the return line so as not to come out of the cut line and touch the compressed rubber layer. A method for manufacturing a power transmission belt, characterized by comprising: A method of manufacturing a power transmission belt that cuts a rectangular cross-section belt laminated and integrated so as to interpose a core wire between a compression rubber layer and an extension rubber layer,
The belt having the rectangular cross section is stretched over at least two shafts having a large diameter portion on both sides of the small diameter portion so that the compressed rubber layer is sandwiched between the large diameter portions,
While pressing at least one of the tension side and the slack side of the belt by a push roll, the belt side surface is sandwiched by a guide roll,
While running while applying tension to the belt, the cutter enters the bias direction along the cut line of the compressed rubber layer pressed by the push roll, and does not come out of the cut line and touch the compressed rubber layer. A method of manufacturing a power transmission belt, wherein the belt is moved back along an inward return line.

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