JP2007297154A - Belt retaining mechanism - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enhance durability of a belt and a divided bead and to reduce wear in a belt retaining mechanism used for the belt using the divided bead. <P>SOLUTION: The divided bead 16 is provided on a peripheral edge of the curve belt 13. A bearing roller 17 is engaged with a projection part 16A of the divided bead 16. The bearing roller 17 is rotatably mounted to a distal end 20A bent relative to a base end 20B of a plate-like support member 20. A rotation surface of the bearing roller 17 is arranged on a belt surface so as to be inclined by θ (30° or less) relative to it. The rotation surface of the bearing roller 17 and the distal end 20A are arranged so as to be left with a predetermined distance. When excessive force is applied to the curve belt 13, the bearing roller 17 is slightly moved by leaf spring effect of the support member 20 and shock absorbing function is accomplished. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a belt holding mechanism for preventing positional deviation of an endless belt used in a belt conveyor.

  In a belt conveyor, a mechanism is generally provided for preventing a belt wound around an end roller from shifting in the axial direction of the roller. In particular, in a curve conveyor, a pair of end rollers are arranged with a predetermined center angle therebetween, and a belt is wound around the end rollers so as to be stretched in a fan shape. Therefore, a centripetal force toward the fan-shaped center acts on the belt during driving. Therefore, a mechanism that prevents positional misalignment is particularly necessary in a curve conveyor.

  As a conventional curve conveyor, a bead made of urethane rubber is sewn along the outer peripheral side edge of the curve belt, and a bearing (roller) fixed to the conveyor body is engaged with this bead to move the belt in the circumferential direction. There is known one that restricts radial movement while feeding. In addition, it is known that the bead is divided in the circumferential direction (divided bead) in order to cope with belt attachment and detachment or bead replacement, and small diameter endless rollers, and a hard material is used for the divided bead. (Patent Document 1).

However, when the beads are divided finely, noise is generated due to interference between the gap between the divided beads and the bearing (roller). Therefore, in the belt conveyor of the cited document 1 using a divided bead, an arcuate guide member that is curved along the outer peripheral edge of the bead instead of the bearing (roller) and is in sliding contact with the divided bead is used as the bead holding means.
JP 2002-338024 A

  The distance from the fan-shaped center of the divided beads slightly differs depending on the location due to dimensional errors and the like. Therefore, if the divided beads are fixedly held by the guide member, an excessive force is applied to some of the divided beads, and the durability of the belt is lowered. Moreover, since the sliding frictional resistance between the guide members and the divided beads increases, each member wears out at an early stage.

  An object of the present invention is to improve durability of a belt and a divided bead and reduce wear in a belt holding mechanism used for a belt using a divided bead.

  A belt holding mechanism according to the present invention is a belt holding mechanism for holding a belt using divided beads, a bearing roller that engages a protrusion of the divided beads, a bearing holding member that holds the bearing roller, It is characterized by having a buffer mechanism that performs a buffer function against the force applied to the bearing roller.

  The rotation surface of the bearing roller is preferably inclined at an angle of 30 ° or less with respect to the belt surface. Moreover, it is preferable that a bearing holding member consists of a plate member provided with elasticity, and it is preferable that a buffer mechanism is comprised by the leaf | plate spring effect by bending of a plate member. Furthermore, the bearing roller is preferably a resin mold type.

  As described above, according to the present invention, in the belt holding mechanism used for the belt using the divided beads, the durability of the belt and the divided beads can be improved, and wear can be reduced.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view schematically showing an overview of a belt conveyor using a curved belt according to an embodiment of the present invention.

  In the curved conveyor 10 of the present embodiment, the rotation shafts of the pair of end rollers 11 and 12 are arranged so as to form a predetermined center angle (approximately 90 ° in the figure), and the end belts 11 and 12 are hung by the curve belt 13. Turned. The curve belt 13 is an endless belt having a truncated truncated cone shape, and the conveyance surface (upper surface) is supported by a support plate 14. The belt folded back at the end rollers 11 and 12 is sandwiched between, for example, a driving roller (not shown) and a pinch bearing under the support plate 14 and driven by the rotation of the driving roller. The drive roller is rotationally driven by a driving motor 15.

  Divided beads 16 made of a hard member such as metal or hard plastic are radially attached to the outer peripheral edge of the curve belt 13 along the peripheral edge. As will be described later, the divided bead 16 is provided with a protrusion 16A, and a bearing roller 17 fixed to the support plate 14 is engaged with the protrusion 16A so that the curve belt 13 is directed toward the center of the fan shape by centripetal force. Prevents deviation. In FIG. 1, the radial movement of the curve belt 13 is restricted by three pairs of bearing rollers 17 (6 in total) arranged at substantially equal intervals along the belt periphery.

  FIG. 2 is a partially enlarged view of the vicinity of the peripheral edge of the curve belt 13 and shows the arrangement of the divided beads 16 along the circumferential direction. FIG. 3 is a side sectional view showing the configuration of the belt holding mechanism in the present embodiment, and shows an engaged state of the divided beads 16 and the bearing rollers 17.

  As shown in FIG. 2, strip-shaped divided beads 16 are attached to the peripheral edge of the curve belt 13 radially with a small gap 18 therebetween. As shown in FIG. 3, the split bead 16 includes a protrusion 16A that protrudes substantially perpendicular to the belt surface, and is attached to the surface of the curve belt 13 by, for example, a pin 19A or a hook 19B.

  The bearing roller 17 is rotatable around the rotation axis X and is attached to the support member 20. In the present embodiment, the support member 20 is made of, for example, a metal plate (elastic plate member) with a distal end portion 20A bent, and the base end portion 20B is fixed to a fixing base 21 provided on the support plate 14. The rotation axis X of the bearing roller 17 is vertically attached to the tip portion 20A.

  At this time, the tip portion 20A is bent so that the rotation surface of the bearing roller 17 is disposed at an angle (θ) of 30 ° or 30 ° or less with respect to the belt surface (support plate 14) (rotation). The axis X is 90 ° −θ with respect to the belt surface), and the rotational surface of the bearing roller 17 is disposed at a position away from the tip 20A by a predetermined distance.

  That is, according to the configuration of the belt holding mechanism of the present embodiment, when the force applied to the bearing roller 17 from the divided bead 16 increases, the moment applied to the tip portion 20A by the bearing roller 17 increases, and the tip portion is caused by the leaf spring effect. Since 20A is further bent with respect to the base end portion 20B, the bearing roller 17 is slightly moved in the radial direction to absorb the temporarily increased force.

  Further, by setting the angle θ of the rotation surface of the bearing roller 17 with respect to the belt surface to be 30 ° or less, even if the split bead 16 is pulled and the tip portion 20A is bent by the leaf spring effect, the bearing roller 17 moves in the vertical direction. Since the amount of movement is kept small, it is possible to prevent the split beads 16 from coming off from the bearing roller 17 even when such bending occurs. Further, since the angle θ is set to 30 ° or less, the vertical downward component of the drag from the bearing roller 17 to the divided beads 16 is suppressed to be small, so that the sliding friction force is pushed and the running resistance is reduced.

  The bearing roller 17 is preferably a resin mold type. In other words, since the maximum load applied to the bearing roller can be reduced by providing a buffering function in the bearing roller holding mechanism, it is possible to employ a roller using a softer resin material than the conventional one. Thereby, the noise generated by the interference between the gap 18 between the divided beads and the bearing roller 17 can be reduced.

  As described above, according to the belt holding mechanism of the present embodiment, an excessive force applied to the bearing roller due to the leaf spring effect can be absorbed, and the load applied to the bearing roller, the divided beads, and the belt is reduced, and the belt As well as improving the durability, wear and noise can be reduced. In addition, conventionally well-known structures other than a leaf | plate spring can also be used for a buffer mechanism.

  In this embodiment, the lower side of the belt is supported by the support plate, and the divided beads and the bearing roller are provided only on the upper surface of the belt. However, the divided beads are provided on both the front and back of the belt, and the same as in the present embodiment. With this method, the split bead and the bearing roller may be engaged also on the back side of the belt, and the belt may be held by the pair of front and back bearing rollers.

  Further, as shown in FIG. 4, the belt holding mechanism of the present embodiment can also be applied to an ordinary linear conveyor having split beads attached to both side edges. That is, the meandering of the belt can be prevented by engaging the protrusions 23A of the divided beads 23 arranged on both side edges of the linear belt 22 with the bearing roller.

It is a perspective view which shows typically the external appearance of the belt conveyor using the curve belt which is one Embodiment of this invention. It is a partial enlarged plan view of the outer periphery part of a curve belt. It is a sectional side view of the belt holding mechanism of this embodiment. It is a partial top view of the linear belt with which the belt holding mechanism of this embodiment is applicable.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Curve conveyor 11, 12 End roller 13 Curve belt 14 Support plate 15 Driving motor 16 Divided bead 17 Bearing roller 20 Support member

Claims (4)

A belt holding mechanism for holding a belt using divided beads,
A bearing roller that engages the protrusion of the split bead;
A bearing holding member for holding the bearing roller;
A belt holding mechanism comprising: a buffer mechanism that performs a buffer function against a force applied to the bearing roller.   The belt holding mechanism according to claim 1, wherein a rotation surface of the bearing roller is inclined at an angle of 30 ° or less with respect to the belt surface.   The belt holding mechanism according to claim 2, wherein the bearing holding member is made of a plate member having elasticity, and the buffer mechanism is configured by a plate spring effect by bending of the plate member.   The belt holding mechanism according to claim 1, wherein the bearing roller is a resin mold type.

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