JP6013860B2 - Rubber strip conveyor cutting device - Google Patents

Description

  The present invention relates to a rubber strip conveying and cutting device capable of cutting while conveying a rubber strip.

  In recent years, as a tire manufacturing method, a strip wind method for forming a rubber member by continuously winding an unvulcanized and long rubber strip around a molding drum or the like has been proposed (for example, see Patent Document 1 below). ). In the strip wind method, it is not necessary to store a rubber extruded product as an intermediate stock as a rubber member, and the manufacturing equipment can be downsized.

In the strip wind method, a rubber strip conveying and cutting device is provided between a rubber extrusion molding machine for continuously extruding a rubber strip and a molding drum. The rubber strip conveying / cutting device includes conveying means for conveying a rubber strip placed on the conveying belt, and cutting means for cutting the rubber strip on the conveying belt.

  FIG. 6 shows an example of a cutting means a of a conventional rubber strip conveying and cutting apparatus. The cutting means a includes a cutting roller d having a cylindrical roller body b and a cutting edge c protruding from the outer peripheral surface of the roller body b. Further, the cutting edge c is a flat blade and extends in a straight line parallel to the rotation axis e of the roller body b.

  Further, the cutting roller d is driven to rotate in synchronization with the traveling speed of the conveyor belt f. Thereby, the cutting edge c contacts the outer surface of the rubber strip g, and the rubber strip g is cut.

  In such a cutting roller d, the entire cutting edge c simultaneously contacts the rubber strip g (line contact). For this reason, the downward cutting force which acts on the rubber strip g from the cutting roller d is easily dispersed over the entire cutting blade c. Further, the cutting edge c extends at right angles to the rotation direction of the cutting roller d. Therefore, the cutting blade c cannot apply a force along the longitudinal direction of the blade to the rubber strip g.

  For this reason, in the conventional cutting roller d, the cutting failure of the rubber strip g may occur. In order to suppress such cutting defects, it is also conceivable to make the cutting edge c sharper and to reduce the gap between the cutting edge c and the conveying surface h. However, such a proposal has a risk of damaging the conveyor belt at an early stage.

  The present invention has been devised in view of the actual situation as described above, and the cutting blade of the cutting roller has a spiral shape and is brought into contact from one side edge of the rubber strip toward the other side edge, The main object of the present invention is to provide a rubber strip conveying / cutting apparatus capable of reducing the cutting failure of the rubber strip while suppressing the damage of the conveying belt on the basis of cutting the rubber strip obliquely.

Among the present inventions, the invention according to claim 1 is provided with a conveyor belt guided so as to be capable of circular motion, and a long and unvulcanized rubber strip extending in the traveling direction of the conveyor belt on the conveyor surface of the conveyor belt. A rubber strip conveying / cutting device comprising conveying means for loading and conveying, and cutting means for cutting the conveyed rubber strip on the conveying belt, wherein the cutting means is the conveying surface of the conveying belt A cylindrical roller body that is supported so as to be rotationally driven around a rotation axis in a direction that intersects the traveling direction along the transport surface, and a cutting blade that protrudes from the outer peripheral surface of the roller body. includes a cutting roller having said cutting edge section is triangular, and, around the rotational axis of the roller body extends helically, the traveling direction of the conveyor belt the cutting roller , The cutting blade contacts the rubber strip sequentially from one side edge of the rubber strip being conveyed to the other side edge and cuts the rubber strip diagonally. It is characterized by doing.

The invention according to claim 2 is the rubber strip conveying and cutting device according to claim 1, wherein the cutting blade has an angle of a tip of the cross section of 25 to 35 ° .

  Moreover, invention of Claim 3 is a rubber strip conveyance cutting apparatus of Claim 1 or 2 with which the said cutting blade is weld-fixed to the said outer peripheral surface of the said roller main body.

  The invention according to claim 4 is the rubber according to any one of claims 1 to 3, wherein the cutting blade has a constant height from the outer peripheral surface of the roller body in the length direction of the cutting blade. It is a strip conveyance cutting device.

  Further, in the invention according to claim 5, the cutting means includes a receiving roller that is rotatable about an axis parallel to the rotation axis at a position facing the cutting roller on the non-conveying surface side of the conveying belt, The rubber strip conveying and cutting device according to any one of claims 1 to 4, wherein the receiving roller supports the load at the time of cutting through the conveying belt.

  In the rubber strip conveying and cutting apparatus of the present invention, the cutting blade spirally extends around the rotation axis of the roller body. Further, the cutting roller rotates in a direction along the traveling direction of the transport belt. Further, when cutting the rubber strip, the cutting blade sequentially contacts from one side edge of the rubber strip toward the other side edge to cut the rubber strip obliquely.

  In such a rubber strip conveying and cutting device, since the cutting blade and the rubber strip are partially contacted (for example, point contact), the force from the cutting roller is sufficiently applied to the rubber strip without being dispersed. Can do. Moreover, in such an apparatus, the contact position between the cutting blade and the rubber strip moves along the longitudinal direction of the cutting blade. Therefore, a force along the longitudinal direction of the cutting edge can be applied to the rubber strip. For this reason, a rubber strip is cut | disconnected easily and a cutting defect is suppressed.

  Further, such a rubber strip conveying / cutting device does not need to use a sharp cutting blade, and does not require an excessively small gap between the cutting blade and the conveying surface. For this reason, damage to the conveyor belt is suppressed over a long period of time.

It is a fragmentary perspective view of the rubber strip conveyance cutting device of this invention. It is an expansion perspective view of the cutting | disconnection means of FIG. It is sectional drawing of the roller main body of FIG. 2, a conveyance belt, and a rubber strip. It is the expanded view which developed the outer peripheral surface of the roller body in a plane. It is AA sectional drawing of the cutting blade of FIG. It is a perspective view which shows the conventional rubber strip conveyance cutting device.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view showing a rubber strip conveying and cutting device (hereinafter, simply referred to as “device”) 1 of the present embodiment. The apparatus 1 of this embodiment is provided between a rubber extruder (not shown) for continuously extruding a rubber strip and a body to be wound T, for example, in a tire production line. The apparatus 1 comprises a conveying means 2 for conveying the rubber strip 4 and a cutting means 3 for cutting the rubber strip 4.

  The conveyance means 2 includes a conveyance belt 5 that is guided by a guide roller 6 supported by the main body frame 22 so as to be capable of rotating. The main body frame 22 is supported by the moving means 9.

  The conveyor belt 5 is long and extends in the traveling direction, and has a belt shape having a width perpendicular to the traveling direction. The conveyor belt 5 has an annular shape and is guided by a plurality of guide rollers 6 to move around. Such a conveyor belt 5 is preferably flexible and, for example, is preferably made of rubber.

  The conveyor belt 5 carries, for example, a long and unvulcanized rubber strip 4 that sticks to the conveyor surface 10, which is the outer peripheral surface of the circular motion, in an advancing direction, for example. After the rubber strip 4 is conveyed to the most downstream guide roller 6e, the rubber strip 4 is peeled off from the conveying surface 10 and wound around the wound body T. For this reason, the conveyance surface 10 is preferably smooth. The non-conveying surface 20, which is the surface opposite to the conveying surface 10, comes into contact with the guide roller 6 without sticking and holding the rubber strip 4. For this reason, it is desirable that the non-transport surface 20 has a larger coefficient of friction than the transport surface 10.

  The guide roller 6 is rotatably supported by the main body frame 22. The guide roller 6 includes a driving roller 6m that drives the conveying belt 5 and a non-driving roller 6f that supports the conveying belt 5 without applying a driving force. The driving roller 6m is driven by an electric motor. The driving roller 6m is driven continuously or intermittently in synchronization with the supply of the rubber strip 4 from the rubber extruder. As a result, the conveyor belt 5 rotates. Further, the non-driving roller 6f is a rotatable roller. The non-driving roller 6 f guides the conveyor belt 5 while suppressing the deflection of the conveyor belt 5.

  The moving means 9 includes a vertical moving means 11 for moving the conveying means 2 parallel to the traveling direction of the conveying belt 5, a horizontal moving means 12 for moving the conveying means 2 in a direction perpendicular to the vertical moving means 11, and a vertical axis. A turning means 13 for turning the transport means 2 around is provided. Further, the moving means 9 supports the conveying means 2 via the loading platform 7.

  Such moving means 9 can freely change the position of the conveying means 2 with respect to the wound body T. For this reason, for example, when the conveying means 2 moves in the direction of the rotation axis of the wound body T in synchronization with the supply amount of the rubber strip 4, the rubber strip 4 is spirally wound around the wound body T. Turned. Further, for example, when the turning means 13 is operated, the rubber strip 4 is wound with an inclination with respect to the circumferential direction of the wound body T.

  The wound body T may be, for example, a cylindrical molding former having a rotation axis substantially parallel to the guide roller, or may be a rigid core having an outer surface approximate to the inner surface of the tire to be molded.

  FIG. 2 shows an enlarged perspective view of the cutting means 3. As shown in FIGS. 1 and 2, the cutting means 3 cuts the rubber strip 4 conveyed by the conveying means 2 on the conveying belt 5. The cutting means 3 of the present embodiment includes a receiving roller 15 provided on the non-conveying surface side, and a cutting roller 14 facing the receiving roller 15.

  The cutting roller 14 includes a cylindrical roller body 17 and a cutting blade 18 protruding from the outer peripheral surface 17 s of the roller body 17. The cutting roller 14 is connected to the drive motor 16 via the connecting boss 8.

  The roller body 17 is located on the side of the conveyance surface 10 of the conveyance belt 5, and is arranged in a direction in which the rotation shaft 17 a intersects the traveling direction of the conveyance belt 5. In the present embodiment, the rotating shaft 17 a is orthogonal to the traveling direction of the conveyor belt 5. As shown in FIG. 3, the height h1 of the rotating shaft 17a from the conveying surface 10 is, for example, that the rubber strip 4 is not in contact with the outer peripheral surface 17s of the roller body 17 and the cutting roller 14 is rotated. At this time, the cutting blade 18 is adjusted to a position in contact with the rubber strip 4. Further, as shown in FIG. 2, the roller body 17 is supported by the bearing base 19 so as to be rotationally driven.

  The cutting edge 18 extends spirally around the rotation shaft 17 a of the roller body 17. That is, the cutting edge 18 is inclined with respect to the rotation shaft 17a of the roller body 17 and extends from one side in the axial direction toward the other side along the outer peripheral surface 17s.

  The drive motor 16 rotates the cutting roller in synchronization with the traveling speed of the conveyor belt 5. As the drive motor 16, for example, a step motor that rotates the cutting roller 14 once when the rubber strip 4 is cut is used. As shown in FIG. 3, when the rubber strip 4 is not cut, the drive motor 16 places the cutting blade 18 on the upper side of the cutting roller 14 and stops it. The drive motor 16 rotates the cutting roller 14 once when the rubber strip 4 is cut.

  As shown in FIG. 2, the receiving roller 15 has a rotation shaft 15 c parallel to the rotation shaft 14 c of the cutting roller 14. The receiving roller is supported by the bearing base 19 so as to be rotatable about the axis of the rotating shaft 15c. Further, the outer peripheral surface 15s of the receiving roller 15 is in contact with the non-conveying surface 20 (shown in FIG. 1) of the conveying belt 5. Such a receiving roller 15 suppresses the bending of the conveyor belt 5 when the rubber strip 4 is cut.

  The diameter of the receiving roller 15 is preferably larger than the diameter of the cutting roller 14. Such a receiving roller 15 increases the contact area between the conveying belt 5 and the receiving roller 15 and effectively suppresses the bending of the conveying belt 5.

  The cutting roller 14 having such a roller body 17 and the cutting edge 18 rotates in a direction along the traveling direction of the transport belt 5. For this reason, as shown in FIG. 4, the cutting roller 14 makes the cutting blade 18 contact the rubber strip 4 sequentially from one side edge 4a of the rubber strip 4 being conveyed toward the other side edge 4b. Let For this reason, the cutting blade 18 cuts the rubber strip 4 diagonally.

  During cutting, the cutting blade 18 and the rubber strip 4 are in partial contact. The contact area is significantly smaller than the conventional cutting edge shown in FIG. For this reason, the vertical force from the cutting roller 14 acts intensively on the rubber strip 4 without being dispersed. Furthermore, such a cutting blade 18 contacts the rubber strip 4 along its longitudinal direction, and applies a cutting force. Thereby, the rubber strip 4 is cut | disconnected easily compared with a flat blade, and a cutting defect is suppressed.

  Such a cutting roller 14 can be cut without using a sharp cutting edge 18 such as a conventional flat blade. Further, it is not necessary to reduce the gap t (shown in FIG. 3) between the cutting edge 18 and the conveying surface 10. For this reason, damage to the conveyor belt 5 is suppressed over a long period of time. Further, by using such a cutting blade 18, t can be easily adjusted as compared with a conventional flat blade, and thus productivity is improved.

  As shown in FIG. 4, the outer peripheral surface 17 s of the roller body 17 includes a cutting region 21 where the cutting blade 18 is disposed and a non-cutting region 22 where the cutting blade 18 is not disposed. The cutting area 21 occupies a range of 140 to 180 ° on the outer peripheral surface 17s, for example. As shown in FIG. 3, when the rubber strip 4 is not cut, the cutting area 21 is positioned above the cutting roller 14, and the non-cutting area 22 faces the transport belt 5.

  As shown in FIG. 4, the cutting blade 18 extends while being inclined with respect to the rotation shaft 17 c of the roller body 17. If the angle θ1 of the cutting blade 18 with respect to the rotating shaft 17c is small, the cut edge of the rubber strip 4 may be long, and if it is large, a cutting failure may occur. For this reason, angle (theta) 1 becomes like this. Preferably it is 30 degrees or more, More preferably, it is 35 degrees or more, Preferably it is 50 degrees or less, More preferably, it is 45 degrees or less.

  FIG. 5 is a cross-sectional view of the cutting blade 18 taken along the line AA. As shown in FIG. 5, the cross section of the cutting edge 18 is preferably, for example, a triangular shape. Such a cutting edge 18 has a small possibility of damaging the conveyance surface 10 like a flat blade, and has excellent durability. Furthermore, even when the cutting edge 18 deteriorates, the cutting edge 18 can be polished by a file or the like to recover the cutting edge. For this reason, maintenance of the apparatus 1 becomes easy and productivity is improved.

  The cutting edge 18 is preferably welded and fixed to the outer peripheral surface 17 s of the roller body 17. Such a cutting edge 18 can reduce the frequency of adjustment of t. Further, the durability of the cutting edge 18 is improved.

  If the angle θ2 of the tip of the cutting edge 18 is reduced, the durability is reduced and the conveyor belt 5 may be damaged. On the other hand, when the angle θ2 is increased, cutting failure may occur. For this reason, angle (theta) 2 becomes like this. Preferably it is 25 degrees or more, More preferably, it is 28 degrees or more, Preferably it is 35 degrees or less, More preferably, it is 32 degrees or less.

  Furthermore, the tip of the cutting edge 18 may be chamfered with a curvature radius of about 2 to 3 mm. Such a cutting edge 18 can improve the durability of the conveyor belt 5 even when t is reduced while suppressing cutting failure.

  The cutting edge 18 preferably has a constant height h2 from the outer peripheral surface 17s in the longitudinal direction of the cutting edge 18. Such a cutting edge 18 makes the force with respect to the rubber strip 4 act uniformly in the longitudinal direction of the cutting edge 18. For this reason, defective cutting is suppressed.

  If the height h2 decreases, the rubber strip 4 may come into contact with the outer peripheral surface 17s of the roller body 17, and if it increases, the durability of the cutting blade 18 may decrease. For this reason, the height h2 is preferably at least 0.1 times the diameter of the cutting roller 14, more preferably at least 0.2 times, and preferably at most 0.4 times, more preferably at 0.3 times. It is as follows.

  As mentioned above, although especially preferable embodiment of this invention was explained in full detail, this invention is not limited to embodiment of illustration, It can deform | transform and implement in a various aspect.

A rubber strip conveying and cutting apparatus having the basic structure shown in FIG. 1 and having the cutting roller shown in FIG. The performance of these devices was also tested. As a comparative example, a similar test was performed on an apparatus having a conventional cutting roller shown in FIG.
The test method is as follows.

<Cutting defect rate>
Using each device, the cutting failure rate was measured when 1000 pneumatic tires were produced. The cutting failure rate means a value obtained by dividing the number of times of cutting with a cutting failure by the total number of cuttings. Further, the defective cutting means a state where the rubber strip is not completely cut. The result is an index with the comparative example being 100, and the smaller the numerical value, the smaller the cutting defect rate and the better.

<Durability of conveyor belt>
Each device was operated and the operation time until the conveyor belt had to be changed was measured. The result is an index with the comparative example being 100, and the larger the value, the longer the life of the conveyor belt and the better.
The test results are shown in Table 1.

  As a result of the test, it was confirmed that the apparatus of the example reduced the cutting defect rate and significantly improved the durability of the conveyor belt as compared with the comparative example.

2 Conveying means 3 Cutting means 5 Conveying belt 10 Conveying surface 14 Cutting roller 17 Roller body 18 Cutting blade

Claims (5)

A conveyor belt that is guided so as to be capable of circular motion, and that conveys a long and unvulcanized rubber strip that extends in the traveling direction of the conveyor belt on the conveyor surface of the conveyor belt, and the conveyor A rubber strip conveying and cutting device comprising cutting means for cutting the rubber strip on the conveying belt,
The cutting means includes a cylindrical roller body supported on the conveyance surface side of the conveyance belt so as to be rotatable around a rotation axis along the conveyance surface and intersecting the traveling direction; A cutting roller having a cutting blade protruding from the outer peripheral surface of the roller body,
The cutting blade has a triangular cross section, and spirally extends around the rotation axis of the roller body,
By rotating the cutting roller in a direction along the traveling direction of the transport belt, the cutting blade is sequentially moved from one side edge of the rubber strip being transported toward the other side edge. A rubber strip conveying and cutting device, wherein the rubber strip is cut obliquely in contact with the strip. The rubber strip conveying and cutting device according to claim 1 , wherein the cutting blade has an angle of a tip of the cross section of 25 to 35 ° .   The rubber strip conveying and cutting device according to claim 1 or 2, wherein the cutting blade is welded and fixed to the outer peripheral surface of the roller body.   4. The rubber strip conveying and cutting device according to claim 1, wherein a height of the cutting blade from the outer peripheral surface of the roller body is constant in a length direction of the cutting blade. 5. The cutting means includes a receiving roller that is rotatable around an axis parallel to the rotating shaft at a position facing the cutting roller on the non-transport surface side of the transport belt,
The rubber strip conveying and cutting device according to any one of claims 1 to 4, wherein the receiving roller supports the load at the time of cutting through the conveying belt.

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