JP2002046832A - Belt drive mechanism and curve belt with bead - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase a friction coefficient between a drive roller and a curve belt to secure high drive force as compared with before, and prevent movement of the curve belt toward the center with a simple structure with securing the high drive force. SOLUTION: This belt drive mechanism 5 comprises the curve belt 1, the drive roller 2 and a press roller 3. The drive roller 2 is disposed inside the curve belt 1, the press roller 3 is disposed on a carrier face 4 of the curve belt 1, and the press roller 3 and the drive roller 2 pinch the curve belt 1 to drive the curve belt 1. The periphery 13 of the curve belt 1 is provided with a bead 6, while a high-friction sheet 7 is fixed to a position of a drive belt surface corresponding to the drive roller 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drive mechanism for a curve belt used in a curve belt conveyor, and a bead used on the outer periphery of the curve belt.

[0002]

2. Description of the Related Art (1) A curved belt conveyor has a function of carrying and transporting a load on a transport surface. For this reason, when a load is placed on the curved belt, a backing plate (15 in FIG. 2) is arranged inside the curved belt so that the curved belt does not sink. When the luggage is placed on the curved belt, the curved belt rotates while rubbing on the backing plate.

Therefore, it was necessary to reduce the dynamic friction coefficient between the inside of the curved belt and the backing plate. Therefore, the canvas (woven cloth), which is the core of the belt, is exposed inside the conventional curve belt.

[0004] This canvas is desirable in that the coefficient of dynamic friction between the curved belt and the backing plate is reduced. However, due to its slippery nature, the coefficient of friction with the drive roller also becomes small, and there is a problem that a sufficient drive force cannot be obtained.

Therefore, conventionally, in order to compensate for this shortage of driving force, a device for performing urethane processing on the surface of the driving roller or using a plurality of driving rollers (Japanese Patent Application Laid-Open No. 11-314719).
And so on. However, it has not yet achieved sufficient driving force.

(2) Further, it is necessary for the curved belt conveyor to prevent the curved belt from moving toward the center due to the shape of the arc-shaped curved belt.

Therefore, as a conventional technique, there was a technique of providing a bead using a bolt or the like on the outer periphery 13 of a curved belt (German Patent: DE342413C2). There is also a technique using a bearing for a bead. However, there is a problem in that it is difficult to mount a bead using bolts and bearings, and that the manufacturing cost is high and the maintenance is complicated.

As a technique for preventing the curved belt from moving toward the center without using a bead, there is a technique in which a pressing roller (pinch roller) that sandwiches the belt together with a driving roller is inclined with respect to the belt center direction. (JP-A-11-59837, JP-A-11-227916, JP-A-11-22791)
7, JP-A-11-286305). However, in the configuration in which the press roller is inclined, if water or oil adheres to the belt and slippage occurs, there is a problem that the curve belt cannot be supported and the curve belt moves to the center side.

The configuration in which the holding roller is inclined has an advantage that a force for moving the belt outward is exerted. But,
In this configuration, when the belt rotates in a predetermined direction, a force acts to move the belt outward. On the other hand, in the rotation in the opposite direction to the plan, a force for moving the belt toward the center works. Therefore, in the configuration in which the pressing roller is inclined, the belt can rotate only in a certain direction, and there is a problem that the use of the curved belt conveyor is limited.

Japanese Patent Application Laid-Open No. H11-227916 discloses a technology that enables the belt to be rotated in both directions while having a configuration in which the press roller is inclined.

[0011]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to increase the friction coefficient between a driving roller and a curve belt so that a higher driving force can be secured than before. Another object is to prevent the curve belt from moving toward the center with a simple configuration while securing a high driving force. It is an object of the present invention to provide a curved belt conveyor which overcomes the above-mentioned problems and has a simple configuration.

[0012]

Therefore, in order to solve the above-mentioned problems, the present invention provides a belt drive mechanism 5 having the following configuration (A: belt drive mechanism) (1) The belt according to the present invention The driving mechanism 5 includes a curved belt 1, a driving roller 2, and a pressing roller 3. The driving roller 2 is disposed inside the curved belt 1, and the pressing roller 3 is disposed on a conveying surface 4 of the curved belt 1. A belt driving mechanism 5 for driving the curved belt with the curved belt 1 sandwiched between the driving belt 3 and the driving roller 2, the bead 6 being provided on the outer periphery 13 of the curved belt, and corresponding to the driving roller 2 on the driving belt surface. A high-friction sheet 7 is fixed in position.

Thus, the curved belt 1 and the contact plate 15
Curve belt 1 with a simple configuration while ensuring the slip with
High driving force can be secured. Here, the “curve belt 1” in the present invention refers to a belt used for the curve belt conveyor shown in FIG. 1, and its main shape is the same as that conventionally used. The "drive roller 2" refers to a roller to which a motor or the like is attached and which itself is given a driving (rotating) force. On the other hand, the “pressing roller 3” has a role of simply pressing down the belt, and refers to a roller that is rotated with the rotation of the curved belt 1. Note that a motor may be attached to both of the two rollers sandwiching the curved belt 1. In this case, the main roller is the driving roller 2.
The secondary roller is the pressing roller 3. "Bead 6" is a member having a role of supporting the outer periphery 13 of the curved belt 1 so that the curved belt 1 does not move to the center side, and is several times as large as the belt thickness T1 of the curved belt as shown in FIG. With a bump 14 having a thickness of In addition, as shown in FIG.
4a, the bump on the drive belt surface side is shown as 14b. -"Drive belt surface" means the belt surface on the side that the drive roller 2 contacts. Since the present invention aims to eliminate slippage between the canvas inside the curved belt 1 and the driving roller 2, the driving belt surface is defined as the inner (lower) surface of the curved belt 1 shown in FIG. Means The “position corresponding to the drive roller 2 on the drive belt surface” refers to a position where the drive roller 2 is in contact with the drive belt surface. Further, when the drive roller 2 rotates the curve belt, the drive roller 2 It is meant to include even the areas that are sequentially in contact. Therefore, “the position corresponding to the drive roller 2” differs depending on the installation position of the drive roller 2 even for the same curved belt 1.

Usually, the driving roller 2 is installed near the outermost periphery 13 of the curved belt 1 in order to exert an appropriate driving force.
Is also near the outermost circumference 13 of the curved belt 1. The “high friction sheet 7” refers to a sheet made of a material having a high friction coefficient with the drive roller 2. When the curved belt conveyor operates, the inside of the belt (on the side of the drive belt surface) and the backing plate 15 must be easily slippery. Therefore, the high friction sheet 7 has a higher friction coefficient than the drive belt surface. In order to sufficiently exhibit the effects of the present invention, the high friction sheet 7
Preferably have a coefficient of friction about twice that of the inside of the belt.

Further, the high friction sheet 7 is fixed to a curve belt, and expands and contracts as the curve belt 1 rotates. Therefore, those having high elasticity are desirable. In addition, depending on the conditions of use of the curve conveyor, waterproofness, mold resistance, abrasion resistance, and the like are required.

(2) Further, in the belt drive mechanism 5 according to the present invention, it is desirable that the beads 6 and the high friction sheet 7 are integrally formed. This allows for separate beads 6
And manufacturing is easier than forming the high friction sheet 7,
Further, the attachment of the bead 6 is easy and firm.

(3) Further, in the belt drive mechanism 5 of the present invention, the surface of the drive roller 2 is made of metal, and
It is desirable that the high friction sheet 7 be made of urethane rubber. Conventionally, the drive roller 2 has been subjected to urethane processing or the like, but a high friction coefficient cannot be obtained with urethane rubber and canvas. On the other hand, a large friction coefficient can be obtained between the metal drive roller 2 and the urethane rubber.

Further, the high friction sheet 7 is required to have waterproofness, friction resistance, manufacturing cost, ease of processing, and the like. Urethane rubber can be said to be the most suitable for these requirements. Therefore, in the present invention, not only the high driving force but also the optimum working conditions can be obtained by using the metal driving roller 2 and the high friction sheet 7 made of urethane rubber.

(4) Further, it is desirable that the belt driving mechanism 5 in the present invention is provided with a groove 10 having an appropriate width and depth on the surface of the high friction sheet 7. As a result, even if water, oil, dust, or the like adheres to the high friction sheet 7, these unnecessary objects enter the groove 10, thereby preventing the drive roller 2 and the high friction sheet 7 from slipping. Furthermore, since it becomes resistant to dirt, the number of maintenances such as cleaning the surface of the high friction sheet 7 can be reduced.

(5) Further, in the belt driving mechanism 5 according to the present invention, the driving roller shaft 16 and the pressing roller shaft 17 are both arranged toward the center of the belt, and the driving roller 2 is driven in both forward and reverse directions. It can be implemented in a form that can be driven. As described in the related art, when the pressing roller shaft 17 is tilted in order to prevent the curved belt 1 from moving in the belt center direction, the driving roller 2 can rotate only in one direction. Therefore, the use as a curved belt conveyor is limited. However, according to the present invention, since the movement of the curve belt 1 in the center direction can be restricted by the beads 6, the curve belt 1 can be rotated without tilting the pressing roller shaft 17.

As described above, the present invention prevents the bead 6 from moving in the center direction of the curved belt 1 so that the pressing roller shaft 17 is positioned in the belt center direction, and
In addition, by ensuring a high driving force with the high friction sheet 7, the use as a curved belt conveyor is expanded.

(6) In the belt driving mechanism 5 according to the present invention, the driving roller shaft 16 is disposed so as to face the center of the belt, and the pressing roller shaft 17 is appropriately inclined in the conveying direction with respect to the center of the belt. The implementation is possible. In this case, since the curve belt 1 is prevented from moving toward the center side by not only the bead 6 but also the pressing roller 3, smoother rotation of the curve belt 1 can be realized.

(7) The curved belt conveyor according to the present invention is characterized in that one of the above-described belt driving mechanisms 5 is disposed substantially near the center of the installed curved belt 1. According to the present invention, the bead 6 can prevent the curve belt 1 from moving toward the center. The high friction sheet 7 can provide a large driving force even with one driving roller 2. Therefore, the belt driving mechanism 5 having these effects is connected to the curved belt 1.
, It is possible to provide a curved belt conveyor having a simple configuration but a larger driving force than the conventional one. Here, the "installed curve belt 1" refers to the curve belt 1 attached to a curve belt conveyor. As a specific example, the curve belt 1 is spread in a fan shape (about 90 °) by the small rollers 11 shown in FIG. It is a curved belt 1 and the like in a state of being set.

(B: Bead 6) (8) The bead 6 used in the present invention is a bead 6 having two high friction sheets 7 facing each other,
A gap 8 corresponding to the width of the curve belt 1 is provided between the high friction sheets 7, and a bump 14 abutting on the driving roller 2 and the pressing roller 3 is provided at a portion where the high friction sheet 7 is connected. The high friction sheet 7 and the bump 1
It is desirable that the molded article 4 is integrally formed.

Bead 6 having two high friction sheets 7
In this case, the high friction sheet 7a is disposed not only on the drive belt surface but also on the transport surface 4. Here, the high friction sheet on the conveying surface 4 side is 7a and the driving belt surface side is 7b. Conventionally, the transport surface 4 of the curved belt 1 is processed to prevent the load from slipping. Therefore, as described above, a certain amount of frictional force is generated between the pressing roller 3 and the transport surface 4 without disposing the high friction sheet 7a on the transport surface 4 side.

However, the two high friction sheets 7a and 7
In the bead 6 having the high friction sheet 7b, not only the high friction sheet 7b is arranged on the drive belt surface side, but also the high friction sheet 7a is arranged on the transport surface 4 so that the high friction sheet 7 is provided only on the drive belt surface. A larger driving force can be obtained as compared with the embodiment.

Further, in the bead 6 having the two high friction sheets 7, the two high friction sheets 7
Can be sewn from above, and the bead 6 can be attached to the curved belt 1 more firmly.

(9) Further, the bead 6 in the present invention
It is desirable to provide a depression 23 at the end of the gap 8. As a result, a so-called play portion is formed on the outer periphery 13 of the curved belt 1. That is, even after the curve belt 1 and the bead 6 are fixed to each other, the outer periphery 13 of the curve belt 1 can move slightly due to the depression 23.

When the curve belt 1 rotates on a curve conveyor, the rotation of the curve belt 1 and the beads 6 is slightly shifted. Therefore, the depression 23 absorbs the deviation between the two, and enables smooth rotation.

(10) Further, the bead 6 in the present invention
Preferably, at least a groove 10 having an appropriate width and depth is provided at least on the surface of the high friction sheet 7 on the drive belt surface side. As a result, similarly to the above (4), water and oil are removed from the high friction sheet 7.
This ensures a high driving force even when it adheres to the surface.

(C: Curved Belt with Bead 6) (11) The present invention is composed of the bead 6 and the curved belt 1 described in the above (9) and (10).
6. A bead 6 which is sandwiched between high friction sheets 7 (7a, 7b) and is integrally fixed therewith.
It is a curved belt 1 with a. The curved belt 1 having the above effects can be provided by the curved belt 1 with the beads 6.

(D: Curved Belt Conveyor) (12) The present invention further comprises a curved belt 1 with a bead 6 described in (11), a driving roller 2 and at least two pressing rollers 3. , A pressing roller 3 is provided on both the conveying surface 4 and the return path surface of the curved belt 1, and the curving belt 1 is sandwiched between the pressing rollers 3 and the driving roller 2. A curved belt conveyor having one belt driving mechanism 5 to be driven is preferable, and the belt driving mechanism 5 is preferably disposed near the center of the installed curved belt 1. Accordingly, it is possible to provide a curved belt conveyor that exhibits the various effects of the present invention described above.

(13) Further, in the curve belt conveyor, the surface of the drive roller 2 is preferably made of metal, and the high friction sheet 7 is preferably made of urethane rubber. Thus, a curved belt conveyor having the effect (3) can be provided.

[0034]

DESCRIPTION OF THE PREFERRED EMBODIMENTS (A: Belt Driving Mechanism) An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a top view of a curved belt conveyor according to the present invention. FIG. 1 is an embodiment of a fan-shaped curved belt conveyor.

In FIG. 1, 1 is a curved belt, 3 is a pressing roller sandwiching the curved belt 1, a thick arrow is a conveying direction of the curved belt 1, 11 is a portion in which small rollers that turn the curved belt 1 are connected, and 12 is a driving roller. 2 is a drive motor for rotating (driving) the motor 2. Since the present invention relates to the curved belt 1, the bead 6, and the belt driving mechanism 5, the other components required for implementing the curved belt conveyor are the same as those of the related art.

The dotted line 2 'indicates the contour of the driving roller 2 disposed inside the curved belt 1. A dotted line indicated as 7 'indicates the outline of the high friction sheet 7 disposed inside the curved belt 1 (the drive belt surface). The belt drive mechanism 5 is configured by these parts. The belt surface for transporting the load is the transport surface 4, the inner surface of the belt is the drive belt surface, and the belt surface that returns from the transport surface 4 and returns to the left in FIG.

FIG. 2 is a cross-sectional view of the belt driving mechanism 5 with the curved belt 1 sandwiched therebetween. As shown in the drawing, the present invention can be embodied in a form in which a driving roller 2 is disposed inside a curved belt 1 (lower side in the figure), and a pressing roller 3 is disposed on a conveying surface 4 of the curved belt 1.

According to the present invention, the bead 6 having the bump 14 is provided on the outer periphery 13 of the curved belt. When the bump 14 comes into contact with the pressing roller 3 or the driving roller 2, the curve belt 1 is prevented from moving toward the center. here,
The bump on the transport surface 4 side is denoted by 14a, its height is denoted by Ha, the bump on the drive belt surface side is denoted by 14b, and its height is denoted by Hb. The heights Ha and Hb of the bumps 14 are the heights from the center of the curved belt 1 to the ends of the bumps 14.

The shape of the bump 14 of the bead 6 is not particularly limited, and is determined in consideration of the belt thickness, the material of the bead 6, and other implementation conditions. The thickness T of the belt
If the height H of the bump 14 is too low with respect to the bump 1,
4 may enter between the rollers. Therefore, the height H of the bump 14 is desirably at least twice the belt thickness T1. On the other hand, if the bump 14 is too large, the flexibility and the like of the curved belt 1 will be lost. Therefore, the height H of the bump 14 is preferably within 20 times the belt thickness T1.

The height H of the bump 14 may be the same as the drive belt surface side and the transport surface 4 side. However, the bump 14b on the side of the drive belt surface is the small roller 1
It is crushed when folded at 1. Therefore, in order to make the turn of the curved belt 1 by the small roller 11 smooth, it is desirable that the height of the inner bump 14b is lower than the height of the bump 14a on the transport surface 4 side.

On the other hand, since the driving roller 2 itself rotates, the driving roller 2 has a stronger force to wind the bead 6 than the pressing roller 3. Therefore, from the viewpoint of preventing the bead 6 from being caught in the driving roller 2, the bump 14 on the driving roller 2 side is used.
It is desirable that the height Hb of b be larger than Ha.

The means for attaching the bead 6 is not particularly limited. Here, from the viewpoint of firmly attaching the bead 6, a means for sewing the bead 6 with the bump 14 together with the curve belt 1 is desirable. On the other hand, considering the easiness of the attaching operation, a means for welding and bonding the bead 6 to the outer periphery 13 of the curved belt 1 is desirable.

The "high friction sheet 7" is fixed at a position corresponding to the drive roller 2 on the drive belt surface. Here, the drive belt surface only needs to have a small coefficient of kinetic friction with the backing plate 15 and easily slip, and can be implemented in a form in which the canvas 19 which is the core of the curved belt 1 appears on the surface thereof. . Further, the surface of the drive belt may have been subjected to a surface treatment on the canvas to facilitate slipping. A surface layer 20 is provided on the side of the transport surface 4 of the curved belt 1 in FIG.

The material of the high friction sheet 7 is determined in consideration of the relationship with the surface of the driving roller 2. As in the related art, if the drive belt surface is the canvas 19 and the surface of the drive roller 2 is subjected to urethane processing, a sufficient frictional force cannot be obtained. Therefore, the present invention can be implemented with a combination that can obtain a larger frictional force. For example, when the surface of the drive roller 2 is made of metal, the high friction sheet 7 is made of rubber of various materials such as urethane rubber, silicon rubber, and natural rubber. Here, it can be said that urethane rubber is suitable for the high friction sheet 7 in consideration of low price, abrasion resistance, elasticity and the like. On the other hand, silicon rubber is suitable under conditions where the temperature changes sharply, such as high or low temperature, or under conditions where an aqueous solution such as acid or alkali may adhere to the curve belt 1. Conversely, the surface of the drive roller 2 may be a rubber material, and the high friction sheet 7 may have a metal surface.

Further, the high friction sheet 7 not only realizes a high friction force by utilizing the characteristics of the material, but also realizes a high friction force by providing various treatments and changes in the shape of the sheet surface. Is also included.

The thickness T7 of the high friction sheet 7 is determined in consideration of not only the characteristics of the material used for the sheet but also the force of the driving roller 2 and the pressing roller 3 sandwiching the curve belt 1, the rotation speed of the driving roller 2, and the like. It is determined from the strength required for the high friction sheet 7. If the high friction sheet 7 is too thin, the strength will be insufficient. On the other hand, if it is too thick, the shearing force generated by the drive roller 2 will increase. Thus, for example, in the case of the high friction sheet 7 made of urethane rubber, the thickness T7 of the sheet is desirably about 1.0 mm to 5.0 mm. Further, when a groove 10 described later is provided, it is necessary to determine the groove 10 in consideration of the depth of the groove 10. The high friction sheet 7 may be fixed at all positions on the drive belt surface corresponding to the drive roller 2, or may be fixed at appropriate intervals.

In the method of producing the high friction sheet 7, a sheet material having a width corresponding to the width of the driving roller 2 is cut into an appropriate length. Then, the cut high friction sheet 7 can be prepared by a method of fixing the cut high friction sheet 7 at a position corresponding to the drive roller 2. The fixing means may be a means for stitching the high friction sheet 7 to the drive belt surface, or a means for welding and bonding. FIG. 2 shows the high friction sheet 7 sewn to the curved belt 1, and the perforation is shown as 40. In addition, in order to smoothly rotate the curved belt 1, a high friction sheet 7 having a circumferential shape corresponding to the inner circumference of the curved belt 1 is prepared and fixed to the inside of the curved belt (welding and bonding). Or stitch together)
Is preferable.

Next, according to the present invention, the bead 6 and the high friction sheet 7 may be integrally formed. Here, as means for integrally molding, not only the bead 6 having the bump 14 but also a mold including the shape of the high friction sheet 7 is used.

The present invention can be practiced by providing grooves 10 of appropriate width and depth on the surface of the high friction sheet 7. Here, the width and depth of the groove 10 are determined according to the conditions under which the curve conveyor 1 is used.

Here, when a large amount of water, oil and dust adhere to the belt, it is desirable to increase the width of the groove 10.
However, if the width of the groove 10 is increased, the contact area between the drive roller 2 and the curve belt 1 is reduced accordingly. On the other hand, if the width of the groove 10 is too small, a sufficient effect of removing water and dust cannot be obtained. From such a viewpoint, it can be said that the width of the groove 10 is preferably in the range of about 0.5 mm to 3.0 mm.

Similarly, when a large amount of water, oil, and dust adhere to the belt, it is desirable to make the groove 10 deep. However, when the groove 10 is deepened, the strength of the high friction sheet 7 decreases, and the risk of breakage increases. On the other hand, if the groove 10 is too shallow, a sufficient effect cannot be obtained. From such a viewpoint, the depth of the groove 10 is determined by the thickness T of the high friction sheet 7.
7 is desirably about 20% to 80%.

The number of the grooves 10 is also determined according to the conditions. Thereby, the groove 1
The effect of 0 can be properly exhibited. There is no limitation on the cross-sectional shape of the groove 10, and in addition to a square as shown in FIG.
It can be implemented in a semicircle, a triangle, or the like. Further, as shown in FIG. 2 (FIG. 4 for reference), this groove 10 is not only a groove concentric with the curve belt 1 (this groove is referred to as a lateral groove), but also a groove in the direction toward the belt center (this groove is Vertical groove).

The effect of providing the groove 10 is to prevent a reduction in the frictional force of the high friction sheet 7 even when water, oil or dust adheres. However, by providing a vertical groove,
The following effects are obtained.

When the high friction sheet 7 provided with the longitudinal grooves rotates, there is a moment when the drive roller 2 enters the concave portion formed by the longitudinal grooves. Then, as the drive roller 2 continues to rotate, the drive roller 2 escapes from the vertical groove and the rotation of the curve belt 1 continues.

The state in which the drive roller 2 enters the vertical groove is, although momentarily, a state in which the curve belt 1 and the drive roller 2 are engaged with each other, and can be said to be a state in which both are integrated. At this moment, the driving roller 2 exerts a higher driving force than when the driving roller 2 is in contact with a portion other than the vertical groove. Therefore, providing the vertical grooves in the high friction sheet 7 in the present invention not only has an effect of preventing a frictional force when water or oil adheres, but also has an effect of using the vertical grooves to exert a high driving force. Things. In addition, although the width and depth of the vertical groove are the same as those of the horizontal groove, the embodiment can be carried out. Is desirable.

Further, the present invention is embodied in a form in which the driving roller shaft 16 and the pressing roller shaft 17 are both arranged toward the center of the belt, and the driving roller 2 can be driven in both forward and reverse directions. Can be. What is the belt center direction?
The direction toward the center of the curved belt 1 shown in FIG. 1 refers to the direction in which the drive roller shaft 16 and the pressing roller shaft 17 face the center of the belt.
It is sufficient if they are almost the same degree. The degree is about 2 °.

Further, in the present invention, the drive roller shaft 16 is arranged toward the center of the belt. On the other hand, press roller shaft 1
7 may be appropriately inclined in the transport direction with respect to the belt center direction.

FIG. 3 shows a state in which the pressing roller shaft 17 is inclined. Here, the press roller shaft 17 is an extension of the rotation axis of the press roller 3, and the drive roller shaft 16 is an extension of the rotation axis of the drive roller 3. Here, the expression that the press roller 3 is inclined in the transport direction with respect to the belt center direction means that the tip end 26 of the press roller 3 moves in the transport direction of the curve belt 1 when viewed from the outer periphery 13 side of the curve belt 1 toward the belt center direction. To lean to

The starting point 25 for inclining the holding roller 3 is
The present invention can be implemented as long as the pressing roller 3 and the driving roller 2 are at any part sandwiching the curved belt 1.
For example, a mode in which the pressing roller 3 is appropriately inclined with respect to the front end 26 or the rear end 27 of the pressing roller 3 as a base point. In view of the fact that the curve belt 1 is effectively sandwiched irrespective of the inclination angle β, it is preferable to incline the vicinity of the center of the press roller 3 as a base point 25 as shown in FIG. By tilting the holding roller 3, the holding roller 3 can pull the curve belt 1 outward, thereby enabling the curve belt 1 to rotate smoothly.

The angle β at which the holding roller shaft 17 is inclined is determined by a balance between a force for pulling the curve belt 1 outward and a force for rotating the curve belt 1. If the angle β of tilting the press roller shaft 17 is small, the curve belt 1
The force to rotate is large, but the force to pull outward is weak. On the other hand, if the angle is greatly inclined, the force for pulling outward is large, but the force for rotating the curve belt 1 is weakened. Thus, the angle β for tilting the holding roller shaft 17 can be set within a range of 5 ° to 15 °.

In the prior art in which the pressing roller 3 is inclined, it is considered that the inclination of the pressing roller 3 is good in the range of 5 ° to 10 ° (JP-A-11-59837). However, according to the present invention, by using the high friction sheet 7, it is possible to obtain a larger frictional force (driving force) than before. Therefore, the angle β at which the press roller 3 is inclined can be made larger than the conventional inclination. Therefore, as an embodiment in which the force for pulling the curve belt 1 outward is prioritized, the holding roller 3 can be inclined by about 7 ° to 15 °.

When carrying out a curved belt conveyor using the belt driving mechanism 5 according to the present invention, it is desirable that the belt driving mechanism 5 is installed only one near the center of the installed curved belt 1.

Here, "near the center of the curved belt 1"
1 means a range of about 40 to 50 degrees of an arc-shaped curved belt conveyor spread to about 90 degrees shown in FIG.

In the case where the curved belt 1 is a semicircular curved belt conveyor spread at 180 °, two belt driving mechanisms 5 are provided. In this case, one belt driving mechanism 5 can be provided in a range of about 40 ° to 50 ° and another belt driving mechanism 5 can be provided in a range of about 130 ° to 140 °.

(B: Bead 6) Next, an embodiment of the bead 6 used in the present invention will be described with reference to FIG.

The bead 6 used in the present invention has two high friction sheets 7 facing each other.
It is desirable to provide a gap 8 corresponding to the width of the curved belt 1 between them. The size of the gap 8 is appropriately determined according to the thickness T1 of the curved belt 1 to be used.

The connecting portion of the high friction sheet 7 has a bump 14 which comes into contact with the driving roller 2 and the pressing roller 3. In FIG. 4, the bump contacting the pressing roller 3 is denoted by 14a.
And the bump contacting the drive roller is denoted by 14b. The height H and the shape of the bump 14 are as described in the embodiment of the belt drive mechanism 5.

Further, the high friction sheet 7 and the bump 14 are integrally formed.

The bead 6 of this embodiment not only obtains a large frictional force due to the high friction sheet 7 but also more strongly secures the bead 6 and the curve belt 1 by sandwiching the curve belt 1 between the two high friction sheets 7. Can be fixed.

Here, the width W of the high friction sheets 7a, 7b
May be appropriately determined according to the widths of the corresponding drive roller 2 and press roller 3, and the embodiment can be implemented in a larger form on the drive roller 2 side or a larger form on the press roller 3 side. In a mode in which the high friction sheet 7 and the curved belt 1 are sewn together as shown in FIG. 4, it is desirable that the width W of the high friction sheet 7 be the same.

It is desirable that the bead 6 is provided with a depression 23 at the end of the gap of the high friction sheet 7. here,
There is no particular limitation on the shape (transverse section) of the “dent 23”, and the shape can be given to allow play on the outer periphery 13 of the curved belt 1. The shape of the recess 23 may be an ellipse, a square, or another polygon other than the circle shown in FIG.

It is desirable that the bead 6 is provided with a groove 10 having an appropriate width and depth on at least the surface of the high friction sheet 7b on the drive belt surface side. The form of the groove 10 on the drive roller 2 side is as described in the embodiment of the belt drive mechanism 5. Therefore, the groove 10 may be a vertical groove other than the horizontal groove shown in FIG.

The bead 6 according to the present invention may have a form in which the groove 10 is provided in the high friction sheet 7a on the pressing roller 3 side. The shape of the groove 10 is the same as that of the groove 10 on the drive belt surface side.

In consideration of water resistance, mold resistance, heat resistance, and the like, urethane rubber is suitable for the material of the bead 6 of the present invention. Further, considering the urethane rubber strength and the like, the thickness T7 of the high friction sheet 7 is about 1.5 mm,
The width of the groove 10 is about 1.0 mm, and the depth of the groove 10 is about 0.5 m
m is suitable.

(C: Curved Belt with Bead 6) The present invention comprises the above-described bead 6 and the curved belt 1, sandwiches the curved belt 1 between the high friction sheets 7 (7a, 7b), and Can be implemented in a form in which they are integrally fixed.

FIG. 5 shows an embodiment of the curved belt 1 with the beads 6. As shown in FIG. 5, in this embodiment, the curved belt 1 is inserted into the gap 8 of the bead 6, and the curved belt 1 is sandwiched between the high friction sheets 7a and 7b. In this embodiment, the bead 6 is sewn to the curved belt 1, and the perforation is 40. From the viewpoint of firmly attaching the bead 6, it is desirable that the bead 6 be stitched concentrically with the curved belt 1 as shown in the figure. Further, since a part of the perforation 40 is slippery,
It is preferable that a concave portion is provided in a portion of 0 and sewing is performed in accordance with the concave portion.

In consideration of the situation where water, oil, and dust adhere to the transfer surface 4 side of the curved belt 1, the high friction sheet 7
It is desirable that the groove 10 be provided with the groove 10. This makes it possible to prevent slippage not only on the drive belt surface side but also on the transport surface 4 side.

In the invention of the curved belt 1 with the beads 6, the grooves 10 may be not only horizontal grooves but also vertical grooves. Further, as a method of fixing the bead 6, in addition to the above-described suturing, a method of welding and bonding, and a method of appropriately combining these can be used.

(D: Curved Belt Conveyor) In the present invention, a curved belt conveyor using the curved belt 1 with the beads 6 can be implemented as follows. The belt driving mechanism 5 according to the invention of the curved belt conveyor includes a driving roller 2 and at least two pressing rollers 3. The driving roller 2 is disposed inside the curved belt 1, and the conveying surface 4 of the curved belt 1 and the return path surface. The pressing roller 3 is disposed on both sides of the driving roller 2, and the pressing roller 3 and the driving roller 2 sandwich the curved belt 1.

FIG. 6 shows the structure of the belt driving mechanism 5. As shown in FIG. 6, this curved belt conveyor is
The driving roller 1 is sandwiched between two pressing rollers. Here, the pressing roller on the upper transport surface 4 side is denoted by 3a, and the pressing roller on the lower return surface side is denoted by 3b.

The belt driving mechanism 5 is mainly the same as the belt driving mechanism in the conventional curved belt conveyor. However, in the present invention, a large driving force can be obtained by the configuration of the high friction sheet 7 and the driving roller 2 as described above. In particular, in this curved belt conveyor, one drive roller 2 is in contact with the high friction sheet 7b at two upper and lower points. The pressing rollers 3a and 3b are also in contact with the high friction sheet 7a. Therefore, the belt driving mechanism 5 has the high friction sheet 7 and a total of four contact points. Thus, a configuration having one belt driving mechanism 5 can obtain a larger driving force than a conventional one as a curved belt conveyor.

In the invention of the curved belt conveyor, "at least two pressing rollers 3" are used. Here, the term “at least” is used because the present invention can be implemented as long as the pressing roller 3 is provided on each of the transport surface 4 and the return path surface, and the number of the pressing rollers 3 can be increased according to the purpose. It is. For example, as an embodiment in which the pressing of the curve belt 1 by the pressing roller 3 is regarded as important, there is a mode in which two pressing rollers 3 are arranged on the transport surface 4 and the return surface to press the curve belt 1.

Then, in order to use the belt driving mechanism 5 most efficiently, the belt driving mechanism 5 is disposed near the approximate center of the curved belt 1. Here, the vicinity of the approximate center of the curved belt 1 is as described in the above (A: belt drive mechanism 5) and FIG. Further, in the present invention,
It is desirable that the surface of the drive roller 2 be made of metal and the high friction sheet 7 be made of urethane rubber. Further, the curved belt conveyor according to the present invention can also be implemented in a form in which one or both of the A: belt driving mechanism 5 and the pressing rollers 3a and 3b are appropriately inclined as shown in FIG.

[Brief description of the drawings]

Fig. 1 Top view of a curved belt conveyor

FIG. 2 is a cross-sectional view of a belt drive mechanism.

FIG. 3 is an explanatory diagram of one embodiment of a belt drive mechanism.

FIG. 4 is a cross-sectional view of a bead.

FIG. 5 shows a bead attached to a curved belt

FIG. 6 is an explanatory diagram of one embodiment of a curved belt conveyor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Curve belt 2 Drive roller 3 Holding roller 4 Conveyance surface 5 Belt drive mechanism 6 Bead 7 High friction sheet 7a High friction sheet on conveyance surface side 7b High friction sheet on drive belt surface side 8 Gap 10 Groove 13 Outer circumference 14 Cobb 16 Driving roller Shaft 17 Pressing roller shaft 23 Depression T1 Belt thickness T7 Sheet thickness β (Pressing roller) tilt angle

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) B65G 39/16 B65G 39/16

Claims (13)

[Claims] 1. A curved belt (1), a driving roller (2) and a pressing roller (3). A driving roller (2) is arranged inside the curved belt (1), and the curved belt (1) is conveyed. A belt driving mechanism (5) for arranging a pressing roller (3) on the surface (4) side, sandwiching the curved belt (1) between the pressing roller (3) and the driving roller (2), and driving the curved belt (1) A bead (6) is provided on the outer periphery (13) of the curved belt (1), and high friction is provided at a position corresponding to the driving roller (2) on the driving belt surface side of the curved belt (1). The sheet (7) is fixed. 2. A belt drive mechanism according to claim 1, wherein
Wherein the bead (6) and the high friction sheet (7) are integrally formed. 3. The belt drive mechanism (5) according to claim 1, wherein the drive roller (2)
The surface of the metal is made of metal and the high friction sheet (7)
Is made of urethane rubber. 4. A belt drive mechanism (5) according to claim 1, wherein a groove (10) having an appropriate width and depth is formed on a surface of said high friction sheet (7). It is characterized by having been provided. 5. The belt drive mechanism (5) according to claim 1, wherein the drive roller shaft (1)
6) and the press roller shaft (17) are both arranged toward the center of the belt, and the drive roller (2) can be driven in both forward and reverse directions. 6. The belt drive mechanism (5) according to claim 1, wherein the drive roller shaft (1)
6) is arranged toward the center of the belt, and the pressing roller shaft (17) is appropriately inclined in the transport direction with respect to the center of the belt. 7. A curved belt, wherein one of the belt driving mechanisms (5) according to any one of claims 1 to 6 is disposed substantially near the center of the installed curved belt (1). Conveyor. 8. A bead (6) having two high friction sheets (7) facing each other, and a gap (8) between the high friction sheets (7) according to the width of the curve belt (1). Is provided at the portion where the high friction sheet (7) is connected, and has a bump (14) that abuts on the driving roller (2) and the pressing roller (3). )
And a bump (14) are integrally formed. 9. The bead (6) according to claim 8, wherein a recess (23) is provided at the tip of said gap (8). 10. The bead (6) according to claim 8, wherein a groove (10) having an appropriate width and depth is formed on at least the surface of the high friction sheet (7b) on the drive belt surface side. Features provided. 11. A curved belt (1) comprising a beat (6) according to claim 8 and a curved belt (1), wherein the curved belt (1) is sandwiched between high friction sheets (7). And a curved belt (1) with a bead (6), wherein these are integrally fixed. 12. A curved belt (1) according to claim 11, comprising a driving roller (2) and at least two pressing rollers (3), wherein the driving roller (2) is provided inside the curved belt (1). The pressing roller (3) is disposed on both the conveying surface (4) and the return path surface of the curved belt (1), and the curving belt (1) is fixed by each pressing roller (3) and the driving roller (2). A curved belt conveyor having one belt driving mechanism (5) for driving a pinching curve belt (1), wherein the belt driving mechanism (5) is arranged substantially near the center of the installed curved belt (1). It is characterized by. 13. A curved belt conveyor according to claim 12, wherein the surface of the drive roller (2) is made of metal and the high friction sheet (7) is made of urethane rubber. .