JPH10167441A - Belt driving device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To constitute the deflective movement restraining device of a conveyor belt compactly and inexpensively by correcting on demand the deflective movement of a flat belt for the belt driving device equipped with a belt folding member by the use of one roller, enhance the durability of its component members, and smoothly perform the relay of articles to be carried without moving the articles with respect to the head and tail sides of a conveyor device. SOLUTION: The belt driving device is equipped with knife edges 15 and 16 disposed at both the end parts of a belt carrying block carrying articles to be carried, and with a plurality of rollers 8 through 10. One out of the respective rollers is formed into a control roller 9 controlling the deflective movement of a conveyor belt. A deflective movement detection ring is provided for the control roller. A deflective movement is corrected on demand by letting one end part of the control roller be displaced by making use of the rotating torque of the deflective movement detection ring, which is produced when the conveyor belt is deflectively moved so as to be brought into contact with the deflective movement detection ring, so that the conveyor belt is thereby stably run.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a belt conveyor,
Belt drive devices applied to food processing processes in the food industry, automatic checkers such as weighing machines and counting machines, metal detectors, etc., especially at the end of a belt transport section that transports objects to be transported by a flat belt The present invention relates to a countermeasure for suppressing a deviation of the flat belt in a device provided with a belt turning member for running the flat belt by turning the flat belt at an acute angle.

[0002]

2. Description of the Related Art In general, a belt driving device includes a head-side roller and a tail-side roller disposed at both ends of a belt transport section for transporting an article to be transported, and a plurality of rollers disposed between the rollers. A flat belt (conveyor belt) is run around these rollers.
A plurality of such belt driving devices are used adjacent to each other in the transport direction when the transported object is transported beyond the belt transport section of the transported object by the flat belt. The belt driving devices adjacent to each other are arranged so as to minimize the interval between the rollers at the end of the belt conveyance section of the flat belt so as to prevent the object to be conveyed from falling between the two devices. I have to.

[0003] However, when an object is transferred between adjacent belt driving devices, the object moves in such a manner as to be inclined, for example, in accordance with the radius of curvature of the roller at the end of the belt driving device, and the object is smoothly conveyed. Can not do it.

For this reason, when a plurality of belt driving devices are adjacent to each other, a knife edge (or a roller edge or the like) that turns the flat belt toward the back surface of the belt with a smaller radius of curvature than the head-side and tail-side rollers of the belt driving device. ), And the folded portion (outer end) of the knife edge is overlapped above the head-side and tail-side rollers of the adjacent belt drive so that the belt drive section is located inside the belt conveyance section. By moving the transported object closer to the flat portion, the transported object can be smoothly connected without moving the load.

By the way, in the belt driving device having such a knife edge, as shown in FIG. 10, the flat belt easily shifts in the belt width direction when the flat belt runs,
Even if the belt pressure is adjusted several times, the belt will still be deflected, and measures to cope with it are required to maintain the stable running of the flat belt. Therefore, in order to stably obtain the transport state of the transported object, it is necessary to prevent the running flat belt from being displaced in the width direction.

For example, as disclosed in Japanese Utility Model Laid-Open Publication No. 6-20331, a V-shaped crosspiece is provided which protrudes from both sides of the flat belt surface in parallel with the belt running direction on both sides of the effective belt width. 2. Description of the Related Art A belt driving device that suppresses a deviation of a flat belt in a belt width direction by holding a crosspiece with a holding roll is conventionally known. And, at the folded part of the knife edge corresponding to each V-shaped crosspiece of the flat belt,
A notch is provided in which both ends of the straight portion are cut out in a substantially triangular shape in accordance with the amount of protrusion of the V-shaped crosspiece.
The mold bar is prevented from protruding outward beyond the folded portion (linear portion) of the knife edge. Thereby, the transfer of the conveyed object between the belt driving devices adjacent to each other,
Despite the provision of the V-shaped bar, smooth operation can be performed without increasing the distance between both devices (between the head-side or tail-side roller and the knife edge).

[0007]

However, the conventional belt driving device provided with a belt folding member such as a knife edge has the following disadvantages.

That is, since the flat belt is folded back to the back side of the belt with a small radius of curvature by the belt folding member, the folded portion of the belt folding member has a V-shaped crosspiece projecting from the surface of the flat belt toward the tip end thereof. A strong tensile force acts in the belt conveying direction, and the durability of the V-shaped crosspiece is extremely low. Further, it is necessary to apply a groove processing to the press roll in conformity with the cross-sectional shape of the V-shaped bar, which increases the cost. Further, in holding down the V-shaped crossbar, it is necessary to apply air pressure or oil pressure to the presser roll. However, the means for applying these pressures becomes large, and the optimum pressure is adjusted according to the running state of the flat belt. The reaction speed of the control to be applied is low, and it is not suitable as a device for suppressing the deviation of the flat belt.

On the other hand, if the radius of curvature of the folded portion of the belt folding member is increased, the durability of the V-shaped crosspiece is ensured, but the upper portion of the head-side roller (or the tail-side roller) at the end of the adjacent belt driving device. In this case, it is impossible to sufficiently overlap the folded portion of the belt folding member so that the folded portion is closer to the flat portion inside the belt conveyance section than the head-side roller (or the tail-side roller). In this case, a load occurs in the transferred object at the time of transfer of the transferred object, and it is impossible to suppress the deviation of the belt using the V-shaped beam in the edge type belt driving device.

Further, if a notch portion cut in a substantially triangular shape is provided in the straight portion of the folded portion of the belt turning member, the flat belt may be displaced and run on the boundary between the straight portion and the notched portion. However, the running portion of the flat belt running on the boundary between the two parts is damaged, and the durability of the flat belt becomes low.

By the way, the applicant of the present invention has previously disclosed that one of a plurality of rollers disposed between rollers at both ends of a belt conveying section is a control roller configured to control the deflection of a flat belt. We have applied for a drive.

If this is applied to a belt driving device in which a belt folding member is disposed at the end of the belt conveyance section, that is, if one of a plurality of rollers is applied as a control roller,
There is no need to protrude a V-shaped bar or the like on the surface of the flat belt, and the durability of the flat belt can be improved even if the flat belt is folded back to the back side of the belt with a small radius of curvature by the belt folding member.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to control one of a plurality of rollers of a belt driving device having a belt folding member disposed at an end of a belt conveyance section. By applying as a roller,
A device for suppressing the flat belt deflection is inexpensively and compactly configured so that the durability of the components can be improved, and the transfer of the transferred object between adjacent belt driving devices is carried. It is intended to make it possible to carry out the operation smoothly and to improve the durability of the flat belt.

[0014]

Means for Solving the Problems In order to achieve the above object, a solution taken by the invention according to claim 1 is a belt disposed at at least one of both ends of a belt transport section for transporting an article to be transported. A folding member, comprising a plurality of rollers disposed in the belt conveyance section, the folding portion of the belt folding member is set to have a smaller radius of curvature than each of the rollers, the flat belt to the belt folding member and each It is assumed that a belt drive device is run around a roller. A control roller configured to control at least one of the plurality of rollers to control the deflection of the flat belt; and a control roller provided at one shaft end of the control roller independently of the control roller. A deflection detection member that is rotatably supported and detects that the flat belt is deflected by rotating upon contact with the flat belt, and a biasing application that deviates the flat belt toward the deflection detection member side Means, cooperating with the deviation detecting member, when the flat belt comes into contact with the deviation detecting member due to the deviation by the offset imparting means and a rotational torque acts on the deviation detecting member, the rotational motion is Roller end displacement means for converting the shaft end of the control roller into a displacement in a predetermined direction and displacing the flat belt in a direction away from the displacement detection member.

[0015] The solution means taken by the invention of claim 2 is as follows.
A belt folding member according to the first aspect of the invention is specified. Specifically, the belt folding member is configured by a knife edge whose folded portion is sharpened in the belt width direction.

According to the first and second aspects of the present invention, when the flat belt rides on the deviation detecting member due to its deviation during the running of the belt, the contact rotates the deviation detecting member, By converting this rotational force into a force for moving the shaft end of the control roller, a flat belt is given an eccentric component in a direction opposite to the above-mentioned eccentricity, and the eccentricity is corrected at any time during belt running to suppress the eccentricity. It is supposed to.

For this reason, it is not necessary to protrude a V-shaped bar or the like from the flat belt surface as a component of the device for suppressing the deviation of the flat belt. Even if it is folded with a small radius of curvature, the durability of the components of the device is not deteriorated. Further, in the above-described apparatus, unlike the apparatus in which grooves are formed on the presser roll, it is not necessary to perform processing on the constituent members, and the cost is reduced. Further, the device is compactly configured without the need for a means for applying air pressure or hydraulic pressure.

Furthermore, when the flat belt is deflected, the shaft end of the control roller moves to give a deflected component in the opposite direction to the flat belt, whereby the flat belt is immediately corrected for deflection, and The reaction speed of the control is increased as compared with the case where the optimum pressure is applied according to the running state of the belt.

Furthermore, it is not necessary to increase the radius of curvature of the folded portion of the belt folding member, and the folded portion of the belt folding member sufficiently overlaps above the roller at the end of the adjacent belt driving device, and It is closer to the flat portion inside the belt transport section than the roller, and the transported object can smoothly transfer without moving.

Further, since there is no projection such as a V-shaped bar on the surface of the flat belt, it is not necessary to provide a notch in the folded portion of the belt folding member. Therefore, the folded portion of the belt folding member has a flat shape without damaging the flat belt, and the durability of the flat belt is enhanced.

The solution taken by the invention of claim 3 is as follows:
The shape of the folded portion of the belt folding member according to the first or second aspect of the present invention is specified. Specifically, the folded portion of the belt folded member is formed to extend straight in the belt width direction and to be formed in a straight line.

According to the third aspect of the present invention, the folded portion of the belt folded member is easily formed with good workability.

The solution taken by the invention according to claim 4 is as follows.
In addition to the constituent features of the invention described in claim 1 or 2,
A crown is formed on the folded portion of the belt folding member so as to make the linear pressure of the contact surface of the flat belt with the folded portion uniform over the belt width direction.

Thus, according to the fourth aspect of the present invention, the flat belt runs more smoothly without generating wrinkles or the like on the flat belt.

The solution taken by the invention described in claim 5 is as follows.
The arrangement of a plurality of rollers according to any one of claims 1 to 4 is specified. Specifically, the plurality of rollers include a driving roller for driving the flat belt and a variable roller capable of changing a set position of the flat belt in the belt pressure adjusting direction. And
With the drive roller as the center, the control roller is arranged on one side and the variable roller is arranged on the other side.

According to the fifth aspect of the invention, the transmission shock of the driving force from the driving roller is mitigated by the variable roller and the control roller on both sides of the driving roller, so that the transfer object can be transported between both ends of the belt conveying section of the conveyed object. The flat belt runs stably.

According to a sixth aspect of the present invention, there is provided a belt folding member according to any one of the first to fifth aspects of the present invention. Specifically, the belt-folded member is formed by extrusion molding of a material such as aluminum, heat-resistant resin, or stainless steel. Then, a belt folding member is inserted from the outside and attached to the end of the belt conveying section of the apparatus frame.

According to the sixth aspect of the present invention, the belt turning member is slippery and excellent in heat resistance, and the running performance of the flat belt is further enhanced. Moreover,
The belt turning member is easily formed by extrusion and is easily assembled to the device frame.

[0029]

Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 to 3 show a belt conveyor to which a belt driving device 1 according to an embodiment of the present invention is applied. In these figures, reference numeral 2 denotes a conveyor frame as a device frame extending in the horizontal direction, and reference numeral 3 denotes a casing joined to a lower portion in the middle of the conveyor frame 2 by bolts (not shown). The belt driving device 1 is provided between a head-side conveyor device X and a tail-side conveyor device X, which convey an object by a conveyor belt Z stretched between a head-side and a tail-side roller, that is, a head-side conveyor device X (in FIG. 1). Right side) tail side roller Xa and tail side conveyor device Y
It is disposed between the head-side roller Ya (on the left side in FIG. 1), and transfers the transferred object transferred from the head-side conveyor device X to the tail-side conveyor device Y for delivery.

The conveyor frame 2 is constructed by assembling an upper plate 5 formed by joining a plurality of plate members on the same plane, and two side plates 6 extending downward on both sides of the upper plate 5.
Each side plate 6 is connected to a control roller 9 (described later) of the belt driving device 1.
Is formed thicker than the upper plate 5 to withstand this load.

On the other hand, the casing 3 is formed in a box shape having an open top, and a spacer shaft 7 is horizontally bridged at an appropriate number of places to maintain a shape so as not to be easily deformed. 1 is stably installed. The belt driving device 1 is installed in an internal space defined by the conveyor frame 2 and the casing 3. A conveyor support leg 14 extending in the vertical direction is attached to a lower portion of the casing 3 via a bracket 13, so that the belt driving device 1 is stably installed above.

The belt driving device 1 includes three rollers. In FIG. 1, a control roller 9 is provided on the left side (one side) of the drive roller 8 with the drive roller 8 at the center, and a variable roller 10 is provided on the right side (the other side). Are arranged respectively.

Each of the rollers 8 to 10 includes a cylindrical roller body 8a to 10a and a roller body 8a to 10a.
Shafts 8b to 10b fitted coaxially with the roller bodies 8a to 10b. Bearings 11 are interposed between both ends of the roller bodies 8a to 10a and the shafts 8b to 10b.
10a are rotatably supported on shafts 8b to 10b via bearings 11, respectively.
An endless conveyor belt B as a flat belt is runably stretched around the roller main bodies 8a to 10a.

Further, at the ends of the belt transport section for transporting the article to be transported by the conveyor belt B, that is, at both ends of the head side (right side in FIG. 1) and the tail side (left side in FIG. 1) of the conveyor frame 2, Head side and tail side knife edges 15 and 16 are provided as belt folding members. These knife edges 15 and 16 are obtained by extruding a molten heat-resistant resin material by an extruder (not shown), and have a predetermined length in the running direction of the conveyor belt B. Sufficient rigidity is secured against bending in the width direction. Therefore, these knife edges 15 and 16 are made of a heat-resistant resin material so as to be easily slid and have excellent heat resistance, so that the traveling performance of the conveyor belt B can be further improved. Moreover, knife edge 1
5 and 16 can be easily formed by extrusion.

These knife edges 15, 16 are shown in FIG.
As shown in FIG. 2, the rollers 8 to 1 at both ends on the head side and the tail side of the conveyor frame 2 are sharpened linearly in the belt width direction.
Radius of curvature smaller than 0 (for example, about 3 to 10 mm)
The conveyor belt B is turned at an acute angle (for example, 40 ° to 45 °) toward the back side of the belt and is slidably contacted. And these knife edges 1
Reference numerals 5 and 16 denote the respective folded portions as tail-side rollers Xa and tail-side conveyor devices Y of the head-side conveyor device X.
Uniform overlap margin L above the head-side roller Ya.
To a flat portion on the inner side of the belt conveyance section from the tail side roller Xa of the head side conveyor device X,
The tail-side conveyor device Y comes closer to a flat portion inside the belt conveyance section than the head-side roller Ya.

Further, each of the above knife edges 15, 16
Are screwed together with insertion support portions 17 inserted into a pair of left and right recesses 2a recessed inward from the head side and tail side end surfaces of the conveyor frame 2, respectively.
In this combined state, the conveyor frame 2 is attached by being inserted into the recess 2a from the outside of both ends on the head side and the tail side. Therefore, the head-side and tail-side knife edges 15, 16 are easily assembled to the recesses 2a at the head-side and tail-side ends of the conveyor frame 2 in a state where the knife edges 15, 16 are combined with the insertion support portion 17 by screws 18. Can be.

Of the rollers 8 to 10, the driving roller 8 is disposed in the center of the lower portion of the casing 3, and the shaft 9b of the control roller 9 and the shaft 10b of the variable roller 10 are arranged around the shaft 8b of the driving roller 8. They are arranged to be line symmetric. Therefore, the transmission shock of the driving force from the driving roller 8 is applied to the control roller 9 and the variable roller 10.
Thus, the conveyor belt B can be stably run between both ends of the belt conveying section of the conveyed object.

The driving roller 8 and the variable roller 10 are
Each is rotatably supported by the casing 3. To describe these support structures in detail, the variable roller 10 is supported horizontally by engaging both ends of a shaft 10b with U-shaped grooves 19a of support plates 19 provided on both sides of the casing 3, respectively. The position of the supporting plate 19, that is, the position of the variable roller 10 (the position between the two-dot chain line shown in FIG. Position) is arbitrarily set to adjust belt tension and belt fluctuation.

The driving roller 8 includes the bearing 11
, And one end (right side in FIG. 2) of the shaft 8 b protrudes from the casing 3, and a driven sprocket 22 is fixed to the protruding end.
The driven sprocket 22 has an output shaft 23 of a motor 23.
The drive roller 8 is connected to the drive sprocket 24 fixed to the drive a by an endless chain 25, and the rotation of the motor 23 is switched in two forward and reverse directions by a switching operation of a changeover switch 26, and the drive roller 8 is rotated in two forward and reverse directions. The traveling of the belt B is switched between forward and reverse directions. In addition, portions protruding from the casing 3 such as the driven sprocket 22, the driving sprocket 24, and the endless chain 25 are covered with a cover 27.

The control roller 9 is supported on the conveyor frame 2 by a support frame 28. Specifically, as shown in FIGS. 5 to 8, mounting plates 29 are joined to the upper ends of the left and right support frames 28 by screws 34, and mounting holes formed in the upper ends of the mounting plate 29 and the conveyor frame 2. The bolts 30 are inserted into the conveyor frame 2 by inserting bolts 30a and 2b. In this mounting state, the locking piece 29b extending below the mounting plate 29 is
It faces the wide part at the lower end. An insertion hole 28a into which both ends of the shaft 9b of the control roller 9 are loosely fitted is formed substantially at the center of the both support frames 28.
8, the insertion hole 28a of the support frame 28 on the right side in the figure is opened so that the shaft 9b can move in two directions. I have. Further, three mounting holes 28b are formed around the insertion hole 28a of the support frame 28.

On the outer surfaces of the support frames 28,
The tension plates 31 are respectively assembled. To explain the assembling structure, an insertion hole 31a into which the shaft 9b of the control roller 9 is inserted is formed substantially at the center of the tension plate 31, and three long holes 31b are formed around the insertion hole 31a on the left side in FIG. Insertion hole 28a of support frame 28
Is formed in the same direction as the long hole. The insertion hole 31a of the tension plate 31 on the left side in the drawing is opened in a perfect circle, and the insertion hole 3a of the tension plate 31 on the right side in the drawing.
Reference numeral 1a denotes an elongated hole which is movable in a direction orthogonal to the insertion hole 28a of the support frame 28 on the left side in the figure.
Then, the tension plate 31 is connected to the support frame 2.
8, the pins 32 are inserted into the elongated holes 31b of the tension plate 31 and the mounting holes 28b of the support frame 28 to connect the two together, thereby connecting the tension plate 31 to the support frame 28. Long hole 31b
Is slidable in the extending direction. At this time, a ring-shaped sliding plate 33 is inserted into the pin 32 between the tension plate 31 and the support frame 28 in order to smoothly slide the tension plate 31. A sliding plate 3 is provided at the end of the shaft 9b so that the shaft 9b of the control roller 9 does not come out of the insertion hole 31a of the tension plate 31.
The E-ring 35 is attached with the E-ring 3 interposed therebetween.

A locking piece 31c is formed at the lower end of the tension plate 31. A tension spring 36 is extended between the locking piece 31c and the locking piece 29b of the mounting plate 29 in an extended state. The urging force in the direction of arrow A1 in FIG. 1 is applied to the shaft 9b of the control roller 9 via the tension plate 31 by the spring force of the tension spring 36 to obtain a predetermined belt tension. The tension spring 36 is set so that the right and left tension springs have different spring forces. That is, the spring force of the left tension spring 36 in the figure is set to be larger than the spring force of the right tension spring 36 in the figure. Thereby, the belt tension on the left side in FIG. 2 is configured to be larger than the belt tension on the right side. When the conveyor belt B is running, the belt tension increases from the side with the larger belt tension, that is, the direction of the arrow A2 in FIG. The conveyor belt B is deflected. Therefore, the conveyor belt B is moved by the tension spring 36 to the later-described eccentricity detecting ring 43.
A bias imparting means for varying the position toward the side is provided.

As shown in FIG. 8, the tension spring 36 is disposed in a wide portion at the lower end of the conveyor frame 2, that is, in an empty space below a horizontal plane inside the conveyor frame 2, and extends inward from an inner vertical surface of the conveyor frame 2. The width of the device can be reduced by that much. That is, tension spring 3
6, the width of the conveyor belt B can be increased by the width W1. It should be noted that the offset imparting means may be configured such that the circumferential lengths of the left and right ends of the belt are changed, or at least one of the rollers 8 to 10 is inclined in the direction of the arrow A2 in FIG. Can be performed.

Of the two support frames 28 supporting the shaft 9b of the control roller 9, the support frame 28 on the right side in FIG.
The back tension holder 37 is attached to the inner surface of. How to attach it is back tension holder 3
7 and screw holes 37a, 31d of the tension plate 31
Into the back tension holder 37
And the tension plate 31 sandwich the support frame 28.

In the center of the back tension holder 37, an insertion hole 37b into which the shaft 9b of the control roller 9 is inserted is formed as a long hole, and two mounting holes 37c are provided on both sides of the insertion hole 37b. Are formed so as to be continuous. A back-tension shaft 39 is inserted into each of the mounting holes 37c, and a back-tension spring 40 is inserted into the back side of the mounting hole 37c. With both inserted, a screw hole 41a of the stopper plate 41 and a screw hole of the back-tension holder 37 are inserted. A set screw 42 is screwed into 37d to close each of the mounting holes 37c. As a result, the back tension spring 40 causes the control roller 9 to rotate the control roller 9 by 180 ° with respect to the end of the shaft 9b in the displacement direction of the end of the shaft 9b.
A pair of back tension springs 40 are used to project the tip of the back tension shaft 39 into the mounting hole 37c by the spring force of the two back tension springs 40, and the back tension shaft 39 causes the shaft 9b of the control roller 9 to move from both sides in FIG. While pressing the shaft 9b by pressing in the directions of A3 and A4, the spring force in the direction substantially opposite to the displacement of the end of the shaft 9b when the conveyor belt B is moved away from the deviation detection ring 43 is applied. It is applied to the end of the shaft 9b.

Therefore, any displacement of the end of the shaft 9b in any direction in the deflection correcting operation of the conveyor belt B can be applied with a spring force acting in the opposite direction to the displacement, and a tension spring can be provided. The position of the end of the shaft 9b of the control roller 9 can be appropriately set by the balance between the moving force of the end of the shaft 9b by 36 and this spring force.

Further, as described above, since the way of passing the conveyor belt B and the back tension springs 40 are arranged symmetrically on both sides of the control roller 9, even if the conveyor belt B is switched in two forward and reverse directions, The displacement direction of the end of the shaft 9b of the control roller 9 when the conveyor belt B is traveling in the forward direction and the displacement direction of the end of the shaft 9b of the control roller 9 when the conveyor belt B is traveling in the reverse direction. By setting the displacement directions to be opposite to each other, the deflection correcting operation can be performed favorably.

At the right end of the shaft 9b of the control roller 9 in the figure, an eccentricity detecting ring 43 as an eccentricity detecting member is rotatably supported independently of the control roller 9. The ring 43 is made of urethane elastomer or the like which has a high coefficient of friction with the conveyor belt B and has excellent wear resistance. Specifically, the deflection detection ring 43
Is provided with a detection main body 44 having an insertion hole 44a at the center, and the detection main body 44 is coaxial with the control roller 9 by the shaft 9b of the control roller 9 being inserted through the insertion hole 44a. Further, it is supported on a shaft 9b so as to be rotatable independently of the control roller 9.

The detection main body 44 has a rising surface 44b formed on a tapered surface whose rotational diameter increases outward, and the outside diameter of the inside of the detection main body 44, that is, the end of the roller main body 9a side is a roller. It is set to the same diameter as the outer diameter of the main body 9a. Further, a concave portion 44 is provided on an outer end surface of the detection main body 44.
c is formed, and a boss 45 is provided on the bottom surface of the concave portion 44 c so as to protrude so as to coincide with the rotation center of the detection main body 44. As a result, when the conveyor belt B is displaced in the direction of arrow A2 in FIG. 2, the end of the conveyor belt B rides on the ride surface 44b of the displacement detection ring 43 due to the displacement. The rotation of the deflection detection ring 43 detects that the conveyor belt B has changed.

One locking pin 46 protrudes from the concave portion 44c of the deflection detecting ring 43, and two locking pins 46 protrude from the tension plate 31. Are fixed to two locking pins 46 on the tension plate 31 side, and the middle is fixed to one locking pin 46 on the deflection detection ring 43 side. Then, in this state, the detection cord 47 is housed in the concave portion 44c of the detection main body 44 of the deviation detection ring 43, and is wound around the boss portion 45 in opposite directions with the locking pin 46 on the deviation detection ring 43 as a boundary. It is hung.

Then, due to the deviation (direction of the arrow A2 in FIG. 2) accompanying the traveling of the conveyor belt B, the conveyor belt B
Rides on the climbing surface 44 b of the deviation detection ring 43, and when a rotational torque acts on the deviation detection ring 43, one side of the detection string 47 is rotated by the rotation of the deviation detection ring 43 so that the boss portion 45 of the deviation detection ring 43. The end of the shaft 9b on the right side of the control roller 9 is wound on the tension plate 31.
1 and is displaced in the direction of arrow A4 in FIG. Thereby, the conveyor belt B is moved in the direction indicated by the arrow A in the direction opposite to the direction indicated by the arrow A2 in FIG.
It is configured to move in five directions.

Therefore, when the conveyor belt B is moved by the tension sprocket 36, the deviation detecting ring 4
3, when a rotational torque is applied to the deflection detecting ring 43 to convert the rotational movement into a movement in which the end of the shaft 9b of the control roller 9 is displaced in a direction perpendicular to the roller axis. And roller end displacement means for moving the conveyor belt B in a direction away from the deviation detection ring 43. That is, when the end of the shaft 9b on the right side of the control roller 9 is displaced in the A4 direction, a deflection component opposite to the initial deflection component (A2 direction component) is generated, and until the initial deflection component cancels out. The end of the shaft 9b of the control roller 9 is displaced. The winding member may be constituted by a belt made of a flexible film-like band.

As described above, since the detection cord 47 is housed in the concave portion 44c of the deflection detection ring 43, the width of the apparatus can be reduced by the amount of the housing. That is, if the width of the apparatus is not changed, the width of the conveyor belt B can be increased by the depressed width W2 of the concave portion 44c (by the amount not protruding).

Further, as described above, since the spring force of the back tension spring 40 acts on the shaft 9b of the control roller 9 via the back tension shaft 39, the shaft 9b moves to the deviation detecting ring 43 of the conveyor belt B. Is released, the end of the shaft 9b of the control roller 9 is returned to a predetermined position (the position shown in FIG. 1) by the spring force of the back tension spring 40. With such a configuration, when the component in the reverse direction due to the displacement of the end of the shaft 9b of the control roller 9 becomes larger than the initial component, the conveyor belt B starts to deflect in the reverse direction, and the deviation detection ring Since the amount of climbing of the shaft 43 on the climbing surface 44b decreases, the rotational torque of the deflection detection ring 43 also decreases. As a result, the amount of displacement of the end of the shaft 9b of the control roller 9 by the back tension spring 40 also decreases. It is becoming.

Next, the operation of the belt conveyor configured as described above will be described. The driving roller 8 rotates in one direction in accordance with the driving of the motor 23, whereby the conveyor belt B runs. The conveyed object is conveyed by placing the conveyed object on the traveling conveyor belt B.

In such a transport operation, as described above, the conveyor belt B always shifts in the direction A2 in FIG. 2 because the right and left belt tensions are different. That is, the conveyor belt B is deviated toward the deviation detection ring 43 at the control roller 9 while traveling.

When the end of the conveyor belt B rides on the climbing surface 44b of each deviation detecting ring 43 due to the deviation of the conveyor belt B, the conveyor belt B and the climbing surface 44b of the deviation detecting ring 43 The deflection detection ring 43 rotates due to the frictional force acting between them, and the rotation winds up one side of the detection string 47. When the drive roller 8 rotates in the opposite direction to the above, the other side of the detection string 47 is wound up.

By the winding of the detection cord 47, the end of the shaft 9b of the control roller 9 is displaced in the direction of arrow A4 in FIG. And, due to this displacement, the conveyor belt B becomes A2
As the vehicle runs while being wound in the opposite direction (A5 direction), the deviation of the conveyor belt B in the A2 direction is limited. At the same time, the back tension shaft 39 is moved in a direction to come out due to the displacement of the shaft portion 9b, whereby the back tension spring 40 is compressed and the spring reaction force is increased, so that the winding force of the detection string 47 and the back tension are increased. The amount of displacement of the control roller 9 is regulated by the balance with the spring reaction force of the spring 40, and the position of the end of the conveyor belt B is maintained at a certain fixed position.

Since the conveyor belt B travels in this manner, the deviation of the conveyor belt B is corrected and suppressed as needed, and as shown in FIG. 9, the amount of deflection of the conveyor belt B in the belt width direction is reduced. That is, the amount of deviation can be suppressed to about 0.13 mm. That is, while the conveyor belt B is preliminarily deflected in one direction and the deviation is automatically corrected, the amount of deviation can be reduced to a small amount, and the conveyor belt B can run stably. Can be stably transported.

Further, since the folded portions of the head-side and tail-side knife edges 15 and 16 which fold the conveyor belt B to the back side of the belt with a small radius of curvature are formed linearly in the belt width direction, the conveyor belt B is formed. For example, damage to the conveyor belt B can be reliably prevented, and the durability of the conveyor belt B can be improved. In addition, in correcting the deviation of the conveyor belt B, the cost can be reduced without processing each part, and the control roller 9 corrects the deviation of the conveyor belt B, so that the configuration can be made compact.

Further, when the conveyor belt B is displaced in the direction A2 in FIG. 2, the end of the shaft 9b on the right side of the control roller 9 is displaced in the direction A4 in FIG. Since the reverse deviation component is generated and the deviation in the A2 direction is corrected, the deviation control of the conveyor belt B can be promptly performed with good response.

Moreover, even if the conveyor belt B is folded back with a small radius of curvature to the back side of the belt by the knife edges 15 and 16, the folded portions of the knife edges 15 and 16 can be connected to the head side conveyor by stably running the conveyor belt B. The belt is transported sufficiently above the tail side roller Xa of the head side conveyor device X by sufficiently overlapping the tail side roller Xa of the device X and the head side roller Ya of the tail side conveyor device Y with a uniform overlap margin L. The flat portion inside the section and the flat portion inside the belt conveying section can be closer to the flat portion inside the belt conveying section than the head-side roller Ya of the tail-side conveyor device Y, and the transferred object can be smoothly connected without moving the load.

Further, since there is no projection such as a V-shaped bar on the surface of the flat belt, it is not necessary to provide a notch in the folded portion of the belt folding member. Therefore, the folded portion of the belt folding member has a flat shape without damaging the flat belt, and the durability of the flat belt is enhanced.

It should be noted that the present invention is not limited to the above embodiment, but includes various other modifications. For example, in the above-described embodiment, the case where the belt driving device 1 is applied to a belt conveyor has been described. However, the present invention is not limited to this, and the food processing process in the food industry field, an automatic checker such as a weighing machine and a counting machine, a metal detection machine, It can be applied to various belt driving devices such as a machine.

As means for converting the rotational movement of the deviation detecting ring 43 into the displacement of the shaft 9b of the control roller 9,
A rack and pinion mechanism may be employed without being limited to the detection string 47 and the detection belt as described above. That is, a gear (pinion) is formed on the outer peripheral surface of the boss portion 45 of the deviation detection ring 43, and this gear meshes with a rack arranged along the direction of the displacement of the shaft 9b of the control roller 9. It is.

Further, although only one control roller 9 is used, if the conveyor belt is long, a control roller for assisting the deviation of the conveyor belt at a position away from the control roller is provided. May be. Further, the knife edges 15, 16 are provided on the head side and the tail side of the conveyor frame 2, but a belt drive device having a knife edge only on one of the head side and the tail side of the conveyor frame may be used. .

Although the knife edges 15 and 16 are made of heat-resistant resin, the knife edge may be formed by extruding a material such as aluminum or stainless steel. Although the knife edges 15 and 16 are used as the belt folding members, a roller edge that turns the conveyor belt with a roller having a small radius of curvature at the folded portion may be used. In this case, the rollers have a strength that does not bend. Required.

Further, the folded portions of the knife edges 15 and 16 are formed linearly in the belt width direction. However, as shown by a virtual line (two-dot chain line) in FIG. A curved crown 51 may be formed to make the linear pressure of the contact surface of the conveyor belt B uniform over the belt width direction. In this case, the running of the conveyor belt B can be performed more smoothly without generating wrinkles or the like on the conveyor belt B.

[0070]

As described above, according to the belt driving device of the first and second aspects of the present invention, the flat belt is biased by displacing the shaft end of the control roller around which the flat belt is runnable. Since the movement is corrected and suppressed as needed, the durability of the components of the device that suppresses this deviation is improved, the cost is reduced by eliminating the need for processing the components of the device, and the belt is ideal for flat belts. By making compact and eliminating the need to apply pressure, and improving the reaction speed of control,
It is possible to provide an optimum device for quickly suppressing the deviation of the flat belt in a belt transport device provided with a belt folding member such as a knife edge. In addition, it is possible to smoothly transfer the transported object without moving the load by using the folded portion of the belt folding member with the radius of curvature kept small. Further, the flattened portion of the flattening member can be prevented from being damaged by the flattened portion of the flattening member, and the durability of the flat belt can be improved.

According to the third aspect of the present invention, since the folded portion of the belt folding member is formed linearly in the belt width direction, the folded portion of the belt folding member can be easily formed with good workability. Can be.

According to the belt driving device of the fourth aspect of the present invention, since the crown is formed at the folded portion of the belt folding member, the flat belt can run more smoothly without generating wrinkles or the like on the flat belt. Can be.

According to the belt driving device of the fifth aspect of the present invention, since the control roller and the variable roller are disposed on both sides of the drive roller, the transmission shock of the driving force from the drive roller is reduced by the variable roller and the control roller. As a result, the flat belt can stably travel between both ends of the belt conveyance section of the conveyed object.

Further, according to the belt driving device of the present invention, the flat belt can be further improved in running performance by forming the belt turning member from a material which is slippery and excellent in heat resistance. In addition, it is possible to simplify the forming of the folded-back member and to improve the assembling property.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional front view of a state in which a part of a belt conveyor according to an embodiment of the present invention is broken.

FIG. 2 is a longitudinal side view of a belt conveyor cut near a control roller.

FIG. 3 is a cross-sectional plan view of a belt conveyor cut in the vicinity of a control roller and a variable roller.

FIG. 4 is an exploded perspective view showing an assembled state of a head-side knife edge.

FIG. 5 is an exploded perspective view of a support structure on one side of the control roller on the side of a deflection detection ring.

FIG. 6 is an exploded perspective view of a support structure on the other end side of the control roller.

FIG. 7 is a perspective view showing a support state of a control roller by a support frame.

FIG. 8 is an enlarged view centering on the deflection detection ring portion of FIG. 2;

FIG. 9 is a characteristic diagram showing a belt runout amount in a traveling direction of the conveyor belt.

FIG. 10 is a diagram corresponding to FIG. 9 according to a conventional example.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Belt drive device 2 Conveyor frame (device frame) 8 Drive roller 9 Control roller 10 Variable roller 15, 16 Knife edge (belt folding member) 36 Tension spring (bias imparting means) 43 Deviation detecting ring (deviation detecting member) 47) Detection cord (roller end displacement means) B Conveyor belt (flat belt)

Claims (6)

[Claims] 1. A belt folding member, comprising: a belt folding member disposed on at least one of both ends of a belt transport section for transporting an article to be transported; and a plurality of rollers disposed in the belt transport section. In a belt driving device that is configured to have a radius of curvature smaller than that of each of the rollers and to run the flat belt around the belt turning member and each of the rollers, at least one of the plurality of rollers is provided. A control roller configured to control the deflection of the flat belt; and a roller supported rotatably at one shaft end of the control roller independently of the control roller, and rotated by the contact of the flat belt. A deviation detecting member for detecting that the flat belt has deviated, a bias applying means for deviating the flat belt toward the deviation detecting member, and the deviation detection In cooperation with the material, when the flat belt comes into contact with the deviation detecting member due to the deviation by the offset imparting means and a rotational torque acts on the deviation detecting member, the shaft end of the control roller transmits the rotational movement. A belt driving device comprising: roller end displacement means for converting the movement of the flat belt in a direction away from the deviation detecting member by converting the movement into a movement displaced in a predetermined direction. 2. The belt driving device according to claim 1, wherein the belt folding member comprises a knife edge whose folded portion is sharpened in a belt width direction. 3. The belt driving device according to claim 1, wherein the folded portion of the belt folding member extends straight in the belt width direction and is formed in a straight line. 4. A folding portion of the belt folding member,
3. The belt driving device according to claim 1, wherein a crown is formed to make the linear pressure of the contact surface of the flat belt against the folded portion uniform in the belt width direction. 5. The driving roller according to claim 1, wherein the plurality of rollers include a driving roller that drives the flat belt, and a variable roller that can change a set position of the flat belt in a belt pressure adjusting direction. The belt driving device according to any one of claims 1 to 4, wherein the control roller is arranged on one side and the variable roller is arranged on the other side with the center as the center. 6. The belt folding member is formed by extruding a material such as aluminum, heat-resistant resin, or stainless steel, and is inserted and attached to the end of the belt conveying section of the apparatus frame from outside. A belt driving device according to any one of claims 1 to 5.