JP3252135B2 - Curved belt conveyor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce damage of a surface of a curved belt by providing a circular-arc shaped and endless-shaped curved belt for carrying an object to be carried from a carrier starting end side toward a carrier termination side and a going route side roller part and a returning route side roller part. SOLUTION: A going route side roller part 24 is rotatably disposed in a state that a going route surface 15 on a carrier termination side is held from the center of a traveling direction A of a curved belt 7, the curved belt 7 is traveled by rotation, and front surface and rear surface of the going route surface 15 of the curved belt 7 are pulled toward an outer peripheral surface of the curved belt 7. A returning route side roller part 25 is rotatably disposed in a state that a returning route surface on a carrier starting side is held from the center of the traveling direction A of the curved belt 7, the curved belt 7 is traveled by rotation, and front surface and rear surface of a returning route surface are pulled toward an outer peripheral side of the curved belt 7. The returning route side roller part 25 is provided with a pair of a returning route side driving roller 41 and a returning route side pinch roller 42 disposed so as to be opposed each other in the vertical direction at a position in the vicinity of an outer peripheral edge of the curved belt 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a curved belt conveyor which conveys a conveyed object in an arc shape.

[0002]

2. Description of the Related Art Conventionally, as this type of curve belt conveyor, for example, a curve belt conveyor disclosed in Japanese Patent Application Laid-Open No. 11-59837 is known.

The curved belt conveyor described in Japanese Patent Application Laid-Open No. 11-59837 discloses the movement of a curved belt toward the center of an arc without providing a belt holding mechanism or the like along the outer periphery of the arc-shaped endless curve belt. One drive roller for running the curve belt is provided between the outward and return surfaces on the outer peripheral portion of the curve belt, and the rotation center axis of the drive roller is set at the arc center of the curve belt and the curve belt. And the reference center line connecting to the center of the outer peripheral portion.

[0004] Above the drive roller, a forward-side pinch roller comes into contact with the upper surface of the forward surface of the curve belt, and the forward-side pinch roller moves the forward surface of the curve belt above the drive roller. The forward-side surface of the outer peripheral portion of the curve belt is held between the forward-side pinch roller and the driving roller.

Below the drive roller, a return-side pinch roller contacts the lower surface of the return surface of the curve belt, and the return-side pinch roller causes the return surface of the curve belt to be below the drive roller. The return path pinch roller and the drive roller hold the return path surface of the outer peripheral portion of the curve belt.

The respective rotation center axes of the forward-side pinch roller and the backward-side pinch roller are inclined in a predetermined direction with respect to the reference center line of the curved belt. As a result, the forward-side pinch rollers The curve belt is urged toward the outer periphery by the return-side pinch roller.

That is, the forward-side pinch roller pulls the surface of the outward surface of the curve belt toward the outer periphery of the curve belt, and the backward-side pinch roller applies the outer surface of the curve belt to the outer surface of the curve belt. By pulling toward the side, the curve belt is urged toward the outer peripheral side by the forward pass pinch roller and the return pass pinch roller. On the other hand, a guide roller for holding an inner peripheral edge of the curved belt is provided on the inner peripheral side of the curved belt.

The guide roller, the forward pinch roller and the return pinch roller prevent the curve belt from moving toward the center of the arc.

[0009]

However, in the conventional curve belt conveyor described in Japanese Patent Application Laid-Open No. H11-59837, the forward pinch roller moves the surface of the outward surface of the curve belt to the outer peripheral side of the curve belt. And the return pinch roller pulls the surface of the return surface of the curve belt toward the outer circumference of the curve belt, so that the tensile force of the curve belt is applied only to the respective surfaces of the outward surface and the return surface. It has a problem in that it has a large effect, and as a result, the surface is severely worn and the surface of the curved belt may be damaged.

The present invention has been made in view of such a point, and can prevent the curve belt from moving toward the center of the arc.
It is another object of the present invention to provide a curved belt conveyor that can reduce damage to the surface of the curved belt.

[0011]

According to a first aspect of the present invention, there is provided a curved belt conveyor configured to convey an object to be conveyed from a conveyance start end to a conveyance end side.
The curve belt is rotatably disposed with the forward end surface on the transport end side sandwiched from the center of the traveling direction of the curve belt. A forward-side roller portion that pulls toward the outer peripheral side of the curve belt, and is rotatably disposed with a return path surface on the conveyance start end side of the center in the traveling direction of the curve belt sandwiched therebetween, and the rotation causes the curve belt to travel. A return roller that pulls the front and back surfaces of the return surface of the curve belt toward the outer peripheral side of the curve belt, wherein the forward roller portion is provided on any one of the front surface and the back surface of the forward surface of the curve belt. The forward-side drive roller that comes into contact with the front-side drive roller and the front-side drive roller that contacts one of the front and back surfaces of the forward-side surface of the curve belt. A forward-side pinch roller for pressing the forward-side surface of the curve belt against the forward-side drive roller while nipping the forward-side surface of the curve belt, and the return-side roller portion includes a front surface and a rear surface of the backward surface of the curve belt. The return-side drive roller that contacts any one of the surfaces and the return-side drive roller that contacts any other surface of the return-side surface of the curve belt and the back-side drive roller that contacts the other surface of the return-side drive roller, and the return-side drive roller A return path pinch roller for pressing the return path surface of the curve belt, wherein the forward path drive roller and the return path drive roller are rotatably arranged in parallel with each other.

In this configuration, the forward-side roller section and the backward-side roller section run the curve belt, and the front and back surfaces of the forward and backward paths of the curve belt are directed toward the outer periphery of the curve belt. Therefore, the tensile force of the curved belt is dispersed on the front and back surfaces while preventing the curved belt from moving toward the center of the arc, thereby reducing damage to the surface of the curved belt.

According to a second aspect of the present invention, there is provided a curved belt conveyor.
In the curved belt conveyor according to the first aspect, the forward drive roller and the backward drive roller are driven to rotate by receiving power from one power source.

According to a third aspect of the present invention, there is provided a curved belt conveyor.
In the curved belt conveyor according to the first aspect, power is transmitted to the forward drive roller and the backward drive roller by an endless body of a transmission mechanism.

According to a fourth aspect of the present invention, there is provided a curved belt conveyor.
In the curved belt conveyor according to any one of claims 1 to 3, the forward drive roller and the backward drive roller are supported by one unit support member.

[0016]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a curved belt conveyor according to an embodiment of the present invention.

1 to 3, reference numeral 1 denotes a frame, and the frame 1 is held by a plurality of leg members 2 so as to be adjustable in height. The leg members 2 are connected by a horizontal connecting member 2a.

An outer frame portion 3 having a substantially arc shape in plan view is formed outside the circumference of the frame 1, and an inner frame portion 4 is formed inside the circumference so as to be spaced apart from the outer frame portion 3. I have. A pair of equal-diameter end rollers is provided between both end portions of the outer frame portion 3 and the inner frame portion 4.
5a, 5b are rotatably mounted, and each end roller 5a,
5b is arranged at an angle of 90 ° in plan view.

An arc-shaped endless curved belt 7 is rotatably bridged between the end rollers 5a and 5b, and a driving unit 8 for applying a driving force to the curved belt 7 is provided on the outer frame portion 3. Installed.

Each of the end rollers 5a and 5b has a number of cylindrical small roller members 11 having the same diameter and rotating independently of each other.
Each of the small roller members 11 is rotatably fitted adjacent to each other along the axial direction of the support shaft 12 on a support shaft 12 bridged horizontally between the outer frame portion 3 and the inner frame portion 4. . The arc center O of the curve belt 7 is located on an extension of the outer diameter of both end rollers 5a and 5b.

The curved belt 7 is formed of a flexible sheet member having a substantially donut shape in a deployed state,
It is bridged between the end rollers 5a and 5b and has an arc-shaped endless shape.

As shown in FIG. 4, the outward surface 15 of the curve belt 7 stretched between the end rollers 5a and 5b is held by a plurality of, for example, three carrier rollers 18 and a holding plate member (not shown). Travel along the horizontal plane. Each carrier roller 18 is arranged radially around the arc center O of the curved belt 7 and is horizontally supported by a support shaft (not shown). For example, 22.5 ° is provided between both end rollers 5a and 5b.
Are arranged at every angle.

On the other hand, as shown in FIGS. 2 and 4, the return surface 16 of the curved belt has a center side excluding both ends in the circumferential direction gradually downward from the inner frame portion 4 side to the outer frame portion 3 side. The vehicle travels in an inclined shape.

The drive unit 8 has a plate-like unit support member 21 as shown in FIG.
At 21, a motor 22 as a power source is positioned and supported on the outer surface side of the outer frame portion 3, a power from the motor 22 is transmitted by a transmission mechanism 23, and the power transmitted by the transmission mechanism 23 is forwarded. The side roller section 24 and the return path side roller section 25 receive and operate.

The forward roller 24 is provided with a curved belt 7
Is arranged so as to be rotatable with the forward path surface 15 on the transport end side sandwiched from the center in the traveling direction A, and the rotation of the curve belt 7 causes the forward path surface of the curve belt 7 to rotate.
The front and back surfaces of the 15 are pulled toward the outer peripheral side of the curved belt 7.

The forward-side roller portion 24 includes a pair of forward-side drive rollers 31 and forward-side pinch rollers 32, for example, which are disposed in the vicinity of the outer peripheral edge of the curved belt 7 so as to face each other up and down. Have.

The forward drive roller 31 is formed in a cylindrical shape having the same diameter, and is fitted on a rotation support shaft 34 supported horizontally by the unit support member 21. On the base end side in the axial direction, a forward pulley 35 of the transmission mechanism 23 is fixedly mounted so as to rotate integrally with the rotary support shaft 34.

The outward pinch roller 32 is formed in a truncated conical shape having a diameter reduced toward the outer peripheral side of the curve belt 7, that is, toward the unit support member 21, and has a cylindrical shape.
It is fitted to a support shaft 36 inclined upward toward the distal end via a bearing (not shown). Furthermore, this support shaft 36
Is connected to the distal end of the outward path-side rotating arm 37, and the outward path-side rotating arm 37 is horizontally rotatable by the unit support member 21 around a central support shaft 37a in the longitudinal direction. The forward-side rotation arm 37 and the unit support member
A plate-shaped circular member 40 is disposed between the circular member 21.

Then, the base end of the forward rotation arm 37 is urged upward by a spring 38 held by a spring holding portion 39, and as a result, the forward drive roller 31 A pinch roller 32 that contacts the back surface of the outward path surface 15 and
Comes into contact with the surface of the outward path surface 15 of the curve belt 7, and the outward path surface 15 of the curve belt 7 is pressed against the outward path driving roller 31 by the outward path pinch roller 32, and these two outward path driving rollers 31 and the outward path side The forward path surface 15 on the transport end side from the center in the traveling direction A of the curve belt 7 is always held by the pinch roller 32 with a predetermined pressing force.

On the other hand, the return-side roller portion 25 is rotatably disposed in a state where the return-side surface 16 on the conveyance start end side is sandwiched from the center of the traveling direction A of the curve belt 7, and rotates the curve belt 7 while rotating. The front and rear surfaces of the return surface 16 of the curved belt 7 are pulled toward the outer peripheral side of the curved belt 7.

The return-side roller portion 25 includes a pair of return-side drive rollers 41 and a return-side pinch roller 42, for example, which are disposed at positions near the outer peripheral edge of the curved belt 7 so as to face each other up and down. Have.

The return-side drive roller 41 is formed in a cylindrical shape having the same diameter, and is fitted to a rotation support shaft 44 horizontally supported by the unit support member 21. A return path driven pulley 45 of the transmission mechanism 23 is fixedly mounted on the base end side in the axial direction so as to rotate integrally with the rotation support shaft 44.

The return-side pinch roller 42 is formed in a truncated conical shape and a cylindrical shape whose diameter is reduced toward the outer peripheral side of the curved belt 7, that is, toward the unit support member 21 side.
It is fitted to a support shaft 46 inclined downward toward the distal end via a bearing (not shown). Furthermore, this support 46
Is connected to the distal end of a return-path-side rotation arm 47, and the return-path-side rotation arm 47 is inclined by a unit support member 21 so as to be rotatable around a central support shaft 47a in the longitudinal direction. The return path side rotation arm 47 and the unit support member
A plate-shaped circular member 40 is disposed between the circular member 21.

Then, the base end of the return-side rotation arm 47 is urged downward by a spring 48 held by a spring holding portion 49, and as a result, the return-side drive roller 41 The pinch roller 42 that contacts the back surface of the return path 16 and
Comes in contact with the surface of the return surface 16 of the curve belt 7, and the outer peripheral portion of the return surface 16 of the curve belt 7 is pressed against the return drive roller 41 by the return pinch roller 42, and these two return drive rollers 41 And the return-side pinch roller 42, the return-side surface on the transport start end side from the center of the traveling direction A of the curve belt 7
16 are always held with a predetermined pressing force.

The rotation shaft of the return-side drive roller 41
The axial dimension of 44 is the rotation support shaft 34 of the forward drive roller 31.
This return-side drive roller 41 is slightly longer than the axial dimension of
As shown in FIG. 4, is located closer to the arc center O of the curve belt 7 than the forward drive roller 31. The axial dimension of the support shaft 46 of the return-side pinch roller 42 is also slightly longer than the axial dimension of the support shaft 36 of the forward-side pinch roller 32, and the return-side pinch roller 42 is larger than the forward-side pinch roller 32. It is arranged on the side of the arc center O of the curved belt 7 and is located inside the curved belt 7 from the outer peripheral edge of the curved belt 7.
Further, the forward drive roller 31 and the backward drive roller 41 are horizontally and parallel to each other at the same height.

The transmission mechanism 23 transmits power from the motor 22 to the forward drive roller 31 and the backward drive roller 41, and has a driving pulley 50 connected to an output shaft (not shown) of the motor 22. An endless body 51 such as a timing belt is stretched over the driving pulley 50, the forward-side driven pulley 35, and the backward-side driven pulley 45.

The power from the motor 22 is transmitted by the transmission mechanism 23 to the forward drive roller 31 and the backward drive roller 41.
Is transmitted to the forward path side driving roller 31, the rotation center axis X1 parallel to the reference center line OP along the radial direction connecting the arc center O of the curve belt 7 and the center P of the outer peripheral portion of the curve belt 7 is moved. While being driven to rotate around the center, the backward drive roller 41 is driven to rotate around a rotation center axis X2 parallel to the reference center line OP of the curve belt 7.

Further, based on the traveling of the curve belt 7, the forward path side pinch roller 32 rotates following the rotation center axis Y1 which coincides with the rotational center axis X1 of the forward path drive roller 31 in a plan view, and returns. Side pinch roller 42
Rotates following the rotation center axis Y2 which coincides with the rotation center axis X2 of the return path drive roller 41 in plan view.

On the other hand, the inner frame portion 4 of the frame 1
As shown in FIG. 4, an opening 55 is opened toward the outer frame portion 3, and the inside edge of the curved belt 7 is inserted into the opening 55. Above the opening 55, there is provided a horizontally long rectangular plate-shaped locking portion 56 which is curved corresponding to the inner periphery of the curve belt 7, and at which the curve belt 7 is That is, the raised forward surface 15 of the curve belt 7 is locked at the time of abnormal movement toward the arc center O.

Next, the operation of the embodiment will be described with reference to the drawings.

Electric power is supplied to the motor 22 of the drive unit 8, and the motor 22 is operated. The power from the motor 22 is transmitted by the transmission mechanism 23 to the forward drive roller 31 and the backward drive roller 31.
When transmitted to the roller 41, the pair of forward drive rollers 31 and the forward pinch roller 32 of the forward roller 24 rotate, and the pair of backward drive rollers 41 and the reverse pinch roller 42 of the backward roller 25. Rotates.

Then, the curved belt 7 travels in the traveling direction A, and by the traveling of the curved belt 7, an object to be transported from the transport starting end onto the surface of the outward path surface 15 of the curved belt 7 is circularly moved. It is conveyed in an arc-shaped movement trajectory,
From the transport end, it is carried out to another conveyor (not shown).

Here, when the curve belt 7 is running, the curve belt 7 is subjected to a force for running the curve belt 7 in the running direction A, as shown in FIG. Is applied toward the center O of the circular arc.

However, the forward roller portion 24 and the backward roller portion 25 are connected to the forward surface 15 and the backward surface 16 of the curve belt 7.
A force F that pulls the curved belt 7 toward the outer periphery is applied to each of the front and back surfaces of the curved belt 7, so that the curved belt 7 is prevented from moving toward the center O of the arc, and a stable running state of the curved belt 7 is maintained.

That is, a force for pulling the curve belt 7 to the outer peripheral side from the forward path drive roller 31 to the back surface of the forward path surface 15 of the curve belt 7 acts, and the forward path pinch roller 32
A force that pulls the curve belt 7 to the outer peripheral side acts on the surface of the outward path surface 15 of the curve belt 7, while the curve belt 7 is applied to the outer peripheral side from the backward drive roller 41 to the rear surface of the backward path surface 16 of the curve belt 7. While the pulling force acts, the force for pulling the curve belt 7 to the outer peripheral side from the return path pinch roller 42 to the surface of the return path surface 16 of the curve belt 7 acts, and as a result, the stable running state of the curve belt 7 is maintained. It is.

Here, the force acting on the curve belt 7 will be described more specifically with reference to FIGS.

Although the forward roller unit 24 will be described, the same applies to the backward roller unit 25. 7 and 8, the outward drive roller 31 and the outward pinch roller 32 are both described as having a cylindrical shape with the same diameter. However, the same applies to a case having a frustoconical shape.

First, based on FIG.
A description will be given of the fact that the outward pulling roller 31 pulls the curve belt 7 outward by μ1 P1 sinα. Μ1 is a coefficient of friction between the forward drive roller 31 and the back surface of the forward surface 15 of the curve belt 7, and P1 is a forward pinch roller 32.
Is the inclination angle of the forward drive roller 31 (forward pinch roller 32) with respect to the direction perpendicular to the traveling direction A of the curve belt 7 (radial direction of the curve belt 7).

While the forward drive roller 31 is being driven to rotate, the reverse side of the forward surface 15 of the curve belt 7 has f1 = μ
1 The force of P1 acts. The component of the force f1 in the traveling direction A and the radial direction of the curve belt 7 is f1 cosα and f1
It becomes sinα. Therefore, the force by which the outward drive roller 31 pulls the curve belt 7 outward is μ1 P1 sinα.

Next, based on FIG.
A description will be given of the fact that the force by which the 24 forward-side pinch rollers 32 pull the curve belt 7 outward is μ2 P1 sinα cosα. Here, μ2 is a coefficient of friction between the outward path side pinch roller 32 and the surface of the outward path surface 15 of the curve belt 7.

First, considering the force acting on the forward-side pinch roller 32 in a state where the curve belt 7 is running by the rotational drive of the forward-side drive roller 31, the forward-side pinch roller 32 is considered.
32 receives a force from the curve belt 7, and a force of f2 = .mu.2 P1 acts on the forward path side pinch roller 32.

The component of the force f2 in the axial direction of the rotation center axis Y1 of the forward path side pinch roller 32 and in the direction perpendicular to the rotation center axis Y1 are f2 sinα and f2 cosα.

Here, considering the force acting on the curve belt 7, the curve belt 7 receives a force R = f2 sinα from the forward-side pinch roller 32, and the amount of the force R in the radial direction of the curve belt 7 is obtained. The force is Rcosα = μ2 P1 sinα
cosα. Therefore, the forward path side pinch roller 32 is
The force pulling the curve belt 7 outward is μ2 P1 sinαc
osα.

As shown in FIG. 9, when the outward pinch roller 32 has a truncated conical shape, that is, a tapered shape, whose diameter is reduced toward the outer peripheral side of the curve belt 7, the curve belt 7 has an outer peripheral side. Is applied.

That is, in the case of the forward pinch roller 32 having the shape of a truncated cone, the circumference differs depending on the position in the axial direction.
The moving distance of the curve belt 7 at the portion in contact with the forward path pinch roller 32 also differs depending on the position in the radial direction. Therefore, when the forward side pinch roller 32 rotates, if the curve belt 7 is in a free state, the curve belt 7 rotates around the taper center O1 of the forward side pinch roller 32.

Therefore, when the curve belt 7 is in a state of being bridged between the end rollers 5a and 5b,
As shown in (1), a tensile force W is applied to the outer periphery of the curved belt 7.

As described above, according to the above-described embodiment, the forward-side roller portion rotatable in a state where the forward-side surface 15 on the transport end side from the center in the traveling direction A of the curved belt 7 is sandwiched from its front and back surfaces. 24, a forward-side drive roller 31 and a forward-side pinch roller 32; The return-side drive roller 41 and the return-side pinch roller 42 rotate the curve belt 7 by rotating in a predetermined direction, and the front and back surfaces of the forward path 15 and the return path 16 of the curve belt 7 Since it is pulled toward the outer circumference of 7,
The curve belt 7 can be prevented from moving to the arc center O side, and the tensile force to the outer peripheral side of the curve belt 7 is dispersed on the front and back surfaces. Thus, damage to the surface of the curved belt 7 can be reduced.

Further, the force for pulling the curved belt 7 toward the outer periphery is dispersed on the front and back surfaces of the curved belt 7 so that
The generation of frictional heat of each of the forward-side pinch roller 32 and the backward-side pinch roller 42 can be suppressed.
Of the curve belt 7 can be reduced, and the stable running state of the curve belt 7 can be reliably maintained.

Further, the forward path pinch roller 32 sandwiches the forward path surface 15 of the curve belt 7 together with the forward path drive roller 31, and presses the outer peripheral portion of the forward path surface 15 of the curve belt 7 against the forward path drive roller 31. , A rotation center axis X1 parallel to the reference center line OP of the curve belt 7 of the forward drive roller 31.
With respect to a rotation center axis Y1 which coincides with the above in plan view. In addition, the return-side pinch roller 42 is connected to the curve belt 7.
Of the curve belt 7 of the return-side drive roller 41 parallel to the reference center line OP of the curve belt 7 while the return-side surface 16 of the curve belt 7 is pressed against the return-side drive roller 41. The rotation is made about a rotation center axis Y2 which coincides with the rotation center axis X2 in plan view.

As a result, the forward drive roller 31 and the forward pinch roller 32, and the backward drive roller 41 and the backward pinch roller 42 are linearly pressed via the curved belt 7, respectively. The driving force can be efficiently transmitted to the curve belt 7 and the rotation directions of the forward-side drive roller 31, the forward-side pinch roller 32, the backward-side drive roller 41, and the backward-side pinch roller 42 and the rotation direction of the curve belt 7 can be improved. Since the angle of deviation from the traveling direction A is small, damage to the curve belt 7 due to the forward drive roller 31, the forward pinch roller 32, the backward drive roller 41, and the backward pinch roller 42 can be suppressed to a small value. 7 can be alleviated over time.

Further, the forward-side pinch roller 32 and the backward-side pinch roller 42 are each formed in a truncated conical shape whose diameter is reduced toward the outer peripheral side of the curve belt 7, so that the configuration is smaller than that of a cylindrical shape having the same diameter. The forward-side pinch roller 32 and the return-side pinch roller 42 can increase the tensile force exerted on the curve belt 7 toward the outer periphery, and the arc center O of the curve belt 7 can be increased.
Movement to the side can be reliably prevented.

Further, the pair of forward drive rollers 31 and the forward pinch rollers 32 and the pair of backward drive rollers 41 and the return pinch rollers 42 are both connected to the curve belt 7.
, The distance between the forward drive roller 31 and the end roller 5b can be reduced, and the distance between the return drive roller 41 and the end roller 5a can be shortened. it can.

Therefore, for example, the outward road surface of the curve belt 7
In FIG. 15, when a relatively heavy object is transported, a tensile force acts on a portion upstream of the forward drive roller 31 while a compressive force acts on a portion downstream of the forward drive roller 31. Although the force acts, the distance between the forward drive roller 31 and the end roller 5b is short, so that the swelling of the curve belt 7 between the forward drive roller 31 and the end roller 5b can be suppressed.

A forward-side pinch roller 32 and a return-side pinch roller 42 are disposed near the outer peripheral edge of the curved belt 7 so that the outer peripheral edge of the curved belt 7
, The entire outer surfaces of the forward-side pinch roller 32 and the return-side pinch roller 42 come into contact with each other by rotation, and the outer peripheral side of the curve belt 7 is moved toward the forward-side drive roller 31.
In addition, the pressing force can be reliably pressed against the backward drive roller, and the driving force can be reliably transmitted to the curved belt 7.

That is, the return road surface 16 of the curve belt 7 is
Since the center side excluding both ends in the circumferential direction is gradually inclined downward from the inner frame portion 4 side to the outer frame portion 3 side, the center side portion of the outer peripheral edge of the return path surface 16 is flat. Although located on the arc center O side of the curve belt 7 from the outer peripheral edge of the outward path surface 15, the axial dimension of the support shaft 46 of the return path pinch roller 42 is the same as the axial direction of the support shaft 36 of the outward path pinch roller 32. By making the length of the return pinch roller 42 a little longer than the dimension and positioning the return path pinch roller 42 closer to the arc center O of the curve belt 7 than the forward path pinch roller 32 and inside the curve belt 7 from the outer peripheral edge of the curve belt 7, Side pinch roller 32
In addition, the return-side pinch roller 42 is positioned inside the curve belt 7 from the outer peripheral edge of the curve belt 7, and the outer peripheral side of the curve belt 7 is securely pressed against the forward-side drive roller 31 and the return-side drive roller, and Power transmission.

Further, since the forward drive roller 31 and the backward drive roller 41 are disposed at the same height position, the forward drive roller 31 and the backward drive roller 41 have the same direction from the upper outer periphery of each of them. Can be transmitted to the outward road surface 15 of the curve belt 7, and the driving force in the same direction can be transmitted to the return road surface 16 of the curve belt 7 from the lower side of the outer periphery.

In the above-described embodiment, the forward-side pinch roller 32 and the backward-side pinch roller 42 are formed in a truncated conical shape, that is, a tapered shape and a cylindrical shape, whose diameter is reduced toward the outer peripheral side of the curve belt 7. Although the configuration described above has been described, for example, as shown in FIGS. 10 and 11, a configuration formed in a cylindrical shape having an equal diameter may be used.

The forward-side pinch roller 32a shown in FIGS. 10 and 11 is formed in a cylindrical shape or the like having the same diameter, and fitted on a horizontal support shaft 36a via a bearing (not shown).
The base end of the support shaft 36a is connected to the outward rotation arm 37. The return-side pinch roller 42a is formed in a cylindrical shape or the like having the same diameter, and is fitted to a horizontal support shaft 46a via a bearing (not shown). The base end of the support shaft 46a is connected to the return-side rotation arm. Connected to 47. Return pinch roller
The axial dimension of the support shaft 46a of the 42a is
The same as or slightly longer than the axial dimension of the support shaft 36a of 32a,
The return path pinch roller 42a is connected to the forward path pinch roller 32.
a is located closer to the arc center O of the curved belt 7 than a, and is located inside the curved belt 7 from the outer peripheral edge of the curved belt 7.

It should be noted that the support shaft of the return path side pinch roller 42a
As shown in FIG. 12, 46a may be configured to incline upward toward the front end side, corresponding to the inclination of the return road surface 16.

The forward pinch roller 32 and the return pinch roller 42 may be formed in, for example, a truncated conical shape whose diameter increases toward the outer peripheral side of the curve belt 7, as shown in FIG. it can.

The forward path side pinch roller 32b shown in FIG.
Is formed into a truncated conical shape, a cylindrical shape, or the like, whose diameter increases toward the outer peripheral side of the curve belt 7, and is fitted via a bearing (not shown) to a support shaft 36b inclined downward toward the distal end side. I have. The return path pinch roller 42b is formed in a cylindrical shape or the like having a truncated cone shape whose diameter is increased toward the outer peripheral side of the curve belt 7, and has a bearing (not shown) mounted on a support shaft 46b inclined upward toward the distal end. It is fitted through. The axial dimension of the support shaft 46b of the return-side pinch roller 42b is the same as or slightly longer than the axial size of the support shaft 36b of the forward-side pinch roller 32b.
Is disposed closer to the arc center O of the curved belt 7 than the forward path pinch roller 32b, and is located inside the curved belt 7 from the outer peripheral edge of the curved belt 7.

Since the forward-side pinch roller 32b and the backward-side pinch roller 42b are each formed in a truncated conical shape whose diameter increases toward the outer peripheral side of the curved belt 7, in order to cope with a change in the peripheral speed of the curved belt 7. The damage of the curved belt 7 can be further prevented as compared with a configuration such as a cylindrical shape having the same diameter.

Further, the configuration in which the forward-side roller section 24 includes, for example, a pair of forward-side drive rollers 31 and a forward-side pinch roller 32 has been described. However, a plurality of pairs of forward-side drive rollers and a forward-side pinch roller are provided. May be adopted. Similarly, the configuration in which the backward path roller unit 25 includes a pair of backward path driving rollers 41 and a backward path pinch roller 42 has been described, but a configuration including a plurality of pairs of backward path driving rollers and a backward path pinch roller. May be.

Further, the return path roller portion 25 may have a configuration in which the axial dimension of the rotation support shaft 44 of the return path drive roller 41 is the same as the axial dimension of the rotation support shaft 34 of the outward drive roller 31. Further, the axial dimension of the support shaft 46 of the return-side pinch roller 42 may be the same as the axial dimension of the support shaft 36 of the outward-side pinch roller 32.
The length of each of the rotation support shaft 44 and the support shaft 46 of the return path pinch roller 42 may be adjustable.

In each of the above embodiments, the motor 22 of the drive unit 8 is
In the description above, the configuration in which the motor 22 is positioned and supported on the outer surface side of the outer frame portion 3 has been described. For example, in order to reduce the size of the entire apparatus, the motor 22 is positioned and supported on the inner surface side of the outer frame portion 3. It can also be.

[0076]

According to the curve belt conveyor of the present invention, the forward roller section and the backward roller section allow the curve belt to travel, and the front and rear surfaces of the forward and backward sections of the curve belt are formed by the curve. Since the belt is pulled toward the outer peripheral side of the belt, the curve belt can be prevented from moving toward the center of the circular arc, and the tensile force of the curved belt is dispersed on the front and back surfaces, so that damage to the surface of the curved belt can be reduced.

[Brief description of the drawings]

FIG. 1 is a plan view showing one embodiment of a curved belt conveyor of the present invention.

FIG. 2 is a side view (II)-(II) in FIG. 1 showing the curved belt conveyor.

FIG. 3 is a front view of the curved belt conveyor.

FIG. 4 is a cross-sectional view of the above curved belt conveyor.

FIG. 5 is a perspective view showing a drive unit of the above curved belt conveyor.

FIG. 6 is a plan view showing outward rollers forming a pair of the drive unit.

FIG. 7 is an explanatory diagram of a force exerted on a curve belt by a forward drive roller of a forward roller forming a pair in the first embodiment;

FIG. 8 is an explanatory diagram of a force exerted on a curved belt by a forward-side pinch roller of a pair of the forward-side rollers;

FIG. 9 is an explanatory diagram of a force exerted on a curve belt by a forward-side pinch roller having the tapered shape.

FIG. 10 is a perspective view showing another embodiment of the forward and backward pinch rollers of the same drive unit.

FIG. 11 is a side view showing the outward and return pinch rollers;

FIG. 12 is a side view showing still another embodiment of the forward-side and return-side pinch rollers.

FIG. 13 is a side view showing still another embodiment of the outward-side and return-side pinch rollers.

[Explanation of symbols]

 7 Curve belt 15 Outgoing surface 16 Returning surface 22 Motor as power source 23 Power transmission mechanism 24 Outgoing side roller portion 25 Incoming side roller portion 31 Outgoing side driving roller 32, 32a, 32b Outgoing side pinch roller 41 Incoming side driving roller 42, 42a , 42b Return-side pinch roller 51 Endless body A Running direction O Arc center P Peripheral center OP Reference center line X1 Rotation center axis of forward-side drive roller X2 Rotation center axis of return-side drive roller Y1 Rotation center axis of forward-side pinch roller Y2 Return center pinch roller rotation center axis

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B65G 15/00-15/28 B65G 15/60-15/64 B65G 21/16 B65G 23/10

Claims (4)

(57) [Claims] 1. An arc-shaped endless curved belt for transporting an article to be transported from a transport start end side to a transport end side, and a state in which a forward path surface on a transport end side is sandwiched from a center of the curve belt in a traveling direction. A forward-side roller portion for rotating the curve belt by rotation, and pulling a front surface and a back surface of a forward surface of the curve belt toward an outer peripheral side of the curve belt; and a traveling direction of the curve belt. It is arranged rotatably with the return path surface on the transport start end side sandwiched from the center of the curve belt, and rotates the curve belt so that the front and back surfaces of the return path surface of the curve belt face the outer peripheral side of the curve belt. A forward-side roller portion that pulls the forward-side roller portion, wherein the forward-side roller portion is in contact with any one of the front surface and the back surface of the outward surface of the curve belt. The driving roller and the forward surface of the curve belt are in contact with any one of the front surface and the rear surface of the outward surface of the curve belt, and the outward surface of the curve belt is sandwiched by the outward side driving roller, and the outward surface of the curve belt is forwarded to the outward side driving roller. A forward-side pinch roller that presses the return-side roller portion, wherein the return-side drive roller is in contact with any one of the front surface and the back surface of the return surface of the curve belt; A return path pinch roller for pressing the return path surface of the curve belt against the return path drive roller while holding the return path of the curve belt between the return path drive roller and the forward path drive roller; And the homeward drive roller,
A curved belt conveyor, which is rotatably arranged in parallel with each other. 2. The curved belt conveyor according to claim 1, wherein the forward drive roller and the backward drive roller are driven to rotate by receiving power from one power source. 3. The curved belt conveyor according to claim 1, wherein power is transmitted to the forward drive roller and the backward drive roller by an endless body of a transmission mechanism. 4. The curved belt conveyor according to claim 1, wherein the forward drive roller and the backward drive roller are supported by a single unit supporting member.