JPH08175637A - Belt driving device - Google Patents

Abstract

PURPOSE: To improve the utility of a belt driving device in which deviating motion can be automatically detected and modified. CONSTITUTION: On five rollers 3-7, a conveyor belt 2 is wound travelingly. A deviating motion detecting ring is arranged in a shaft end part of a deviating motion controlling roller 6, and initial deviating motion is cancelled by displacing a shaft end part, on one side of the deviating motion controlling roller 6 while using rotational torque, which is produced when the conveyor belt 2 is deviated to be brought into contact with the deviating motion detecting ring, of the deviating motion detecting ring. A variable roller regulating member 48 is arranged to both shaft end parts of a variable roller 7, and a position of each shaft end part is freely changed according to the operation of the variable roller regulating member 48. A shift quantity of the shaft end part position is regulated, and the shaft end part is set in a position contributing to a traveling condition, in which deviating motion can be excellently modified, for the belt conveyor 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a belt driving device, and more particularly to a belt driving device provided with a mechanism for correcting deviation by displacing a shaft end portion of a roller when deviation occurs in a belt.

[0002]

2. Description of the Related Art Conventionally, for example, actual Kaihei 6-20331
In the belt conveyor as disclosed in the publication, one of the conditions for stably obtaining the conveyed state of the conveyed object is that the traveling conveyor belt does not deviate in the width direction.

Conventionally, various structures have been proposed as a structure for preventing such belt deviation. For example, as described in the above-mentioned publication, forcibly preventing the deviation of the flat belt, or as shown in Japanese Utility Model Publication No. 54-43508, the roller shafts are arranged so that the axes of the rollers are parallel to each other. There are things such as forcibly positioning the heart position.

[0004]

However, the conventional structure as described above has a problem in practical use. That is, in the case of forcibly preventing the deviation of the belt, it is necessary to increase the strength of the belt so as not to damage the belt, and a belt having a small thickness cannot be used. Further, in the case where the axial center position of the roller is forcibly positioned, there is a problem that the bearing portion of the roller needs to have high rigidity, and an excessive load acts on the roller, so that the life of the device cannot be extended. .

In order to solve these problems, the inventor of the present invention has improved the structure of a belt drive device capable of automatically detecting and correcting the deviation, and has various structures. Proposed (for example, JP-A-6
-11001 gazette).

More specifically, one of the plurality of rollers is used as a deviation adjusting roller, and one side of the deviation adjusting roller is provided with a deviation detecting member which is rotatable independently of the deviation adjusting roller. I will let you. Then, the flat belt is configured to be biased in advance toward the bias detection member. And
When the flat belt runs on the deviation detecting member due to its deviation while the flat belt is running, this contact causes the deviation detecting member to rotate, and this rotational force moves the shaft end of the deviation adjusting roller. We are developing a structure in which the flat belt is given a deviation component in the direction opposite to the deviation by converting it into force, and the deviation is corrected.

Further, the inventor of the present invention has considered how to make the mechanism capable of automatically correcting the deviation of the flat belt thus more practical. Then, they found that the following problems had to be overcome in order to put this into practical use.

One of them is to increase the control width for preventing deviation. That is, when the belt driving device that automatically corrects the deviation of the flat belt is used as the belt conveyor as described above, when the riding amount of the belt deviation detecting member becomes significantly large, a good deviation correction operation cannot be obtained. As a result, not only can the conveyed object not be stably conveyed, but also the belt may fall off the roller. In addition, if the friction coefficient between the belt and the deviation detecting member changes due to the operating conditions of this device or changes with time, for example, the rotational force applied from the belt to the deviation detecting member cannot be obtained sufficiently. In this case, too, the riding amount is significantly increased, and a good deviation correcting operation cannot be obtained.

Another problem is to always perform a good deviation correction operation regardless of the running state of the belt. That is, for example, in order to improve the practicality of the belt conveyor or the like, it is required that the traveling direction of the belt be variable in the forward and reverse directions. However, good deviation correction operation should be performed in any of these traveling directions. It is also important to improve the practicality of this type of belt drive device.

The present invention has been made in view of this point, and the eccentric belt rides on the eccentricity detection member, and the rotational force generated in the eccentricity detection member by this is applied to the movement force of the roller shaft end portion. It is an object of the present invention to improve the practicality of a belt drive device which can automatically detect and correct the deviation by converting the deviation into a belt deviation and correcting the deviation of the belt.

[0011]

In order to achieve this object, the present invention expands the control range for preventing deviation by changing the axial center position of at least one roller by operation.

[0012] Specifically, the means taken by the invention according to claim 1 is a flat belt, and a plurality of rollers around which the flat belt is stretched, at least one of which is a deviation adjusting roller. A deviation detecting member rotatably supported independently of the deviation adjusting roller at one shaft end of the deviation adjusting roller, and the flat belt toward the position where the deviation detecting member is disposed. When the flat belt is connected to the deviation detecting member and is moved by the deviation detecting member, the flat belt is deviated by the deviation applying device, and the deviation causes the flat belt to come into contact with the deviation detecting member to exert a rotational torque. And a roller end displacing means for converting the rotational movement into movement in which the shaft end of the deviation adjusting roller is displaced in a predetermined direction and moving the flat belt in the direction away from the deviation detecting member. Further, among the above-mentioned plurality of rollers, at least one roller other than the deviation adjusting roller is provided with a roller shaft center adjusting means capable of changing the inclination angle of the shaft center of the roller with respect to the other rollers. It is configured.

According to a second aspect of the present invention, in the belt drive device according to the first aspect, the roller shaft center adjusting means is provided at both ends of the roller. A bearing member that rotatably supports the shaft end portion in the roller shaft center adjusting means, and a guide member that guides the bearing member so as to be movable in a direction orthogonal to the extension direction of the roller shaft center, An adjusting member that adjusts the position of the bearing member with respect to the guide member to adjust the axial center position of the roller and the inclination angle of the axial center is provided.

According to the third aspect of the present invention, a good deviation correcting operation can be performed in any traveling direction of the flat belt.

Specifically, a flat belt, a plurality of rollers which are wound around the flat belt so as to be able to run in the forward and reverse directions, and at least one of which is a deviation adjusting roller, and the deviation adjusting roller. A deviation detecting member that is rotatably supported independently of the deviation adjusting roller at one of the shaft ends, and an offset imparting movement of the flat belt toward the position where the deviation detecting member is disposed. Means and the deviation detecting member, the flat belt is biased by the offset imparting means, and when the flat belt comes into contact with the deviation detecting member due to this deviation and a rotational torque acts, the rotational movement of the flat belt is suppressed. A roller end displacing means for converting the shaft end of the deviation adjusting roller into a movement for displacing in a predetermined direction and moving the flat belt in a direction away from the deviation detecting member is provided. The direction of the rotational torque generated in the deviation detecting member when the deflecting flat belt comes into contact with the deviation detecting member in the roller end displacing means is variable according to the traveling direction of the flat belt. Therefore, the displacement direction of the shaft end portion of the deviation adjusting roller when the flat belt is traveling in the forward direction and the shaft end of the deviation adjusting roller when the flat belt is traveling in the opposite direction The displacement direction changing means for setting the displacement directions of the parts in mutually opposite directions is provided.

According to a fourth aspect of the present invention, in the belt driving device according to the third aspect, one shaft end portion of the deviation adjusting roller provided with the deviation detecting member is rotatably supported by a fixing member. . Further, the displacement direction varying means is provided with a winding member having flexibility and wound around the deviation detecting member, and both ends of the winding member are arranged in a direction in which the flat belt is separated from the deviation detecting member. The displacement adjusting roller is fixed to the fixing member at a position sandwiching the shaft end portion in the displacement direction of the shaft end portion when moving.

According to a fifth aspect of the present invention, in the belt drive device according to the fourth aspect, a part of the winding member wound around the deviation detecting member is fixed to the deviation detecting member. I am trying.

According to a sixth aspect of the invention, in the belt drive device according to the third aspect, one shaft end portion of the deviation adjusting roller provided with the deviation detecting member is rotatably supported by a fixing member. . In addition, the displacement direction varying means is provided with a pair of winding members which are flexible and are wound around the deviation detecting member, and the winding members are connected to each other at one end thereof with a flat belt. In the displacement direction of the shaft end of the deviation adjusting roller when moving in the direction away from the motion detecting member, the shaft is fixed to a fixing member at a position sandwiching the shaft end, and the deviation detecting member at the other end is fixed. The winding directions are set opposite to each other, and the ends are fixed to the deviation detecting member.

The invention according to claim 7 is the above-mentioned claim 3,
4. The belt drive device according to 4, 5, or 6, wherein the displacement direction varying means is substantially opposite to the displacement of the shaft end portion of the deviation adjusting roller when the flat belt is moved in the direction away from the deviation detecting member. Biasing means for applying a directional biasing force to the shaft end is provided. Further, a pair of the biasing means is provided in the displacement direction of the shaft end portion of the deviation adjusting roller so as to sandwich the shaft end portion.

[0020]

According to the present invention, the following effects can be obtained in the present invention. According to the first aspect of the present invention, when the flat belt is biased by the action of the offset imparting means and comes into contact with the deviation detection member, the deviation detection member rotates due to contact friction with the flat belt. Then, along with this rotational movement, the rotational movement is converted into movement in which the shaft end portion of the deviation adjusting roller is displaced in a predetermined direction. When the shaft end portion of the deviation adjusting roller is displaced in this way, the flat belt undergoes an eccentric displacement opposite to the eccentric direction, so that the initial eccentricity is corrected. That is, the displacement amount of the shaft end portion of the deviation adjusting roller according to the initial deviation is automatically given to correct the deviation of the flat belt. Therefore, the flat belt can travel stably. Then, in a situation where the deviation amount of the flat belt becomes too large to perform a sufficient deviation correction operation, the deviation amount can be reduced by changing the inclination angle of the roller shaft center by the roller shaft center adjusting means. As a result, a good deviation correction operation can be performed.

According to the second aspect of the invention, as the operation for changing the inclination angle of the roller shaft center, the adjusting member is adjusted to adjust the position of the bearing member with respect to the guide member. That is, by moving the shaft end portion of the roller supported by the bearing member in the direction orthogonal to the roller shaft center, the amount of deviation can be reduced, and good deviation correction operation can be performed.

According to the third aspect of the invention, the displacement direction varying means allows the flat belt to travel in the opposite direction to the displacement direction of the shaft end of the deviation adjusting roller when the flat belt is running in the positive direction. Even when the displacement direction of the shaft end of the deviation adjusting roller is set to be opposite to each other while the flat belt running direction is variable, the good deviation correcting operation can be always performed. Done.

In the inventions according to claims 4 to 6, a structure for performing the deviation correction operation according to the traveling direction of the flat belt can be specifically obtained, and the device can be made practical.

In particular, according to the invention of claim 5, slippage between the deviation detecting member and the winding member is reliably prevented, and the rotational movement of the deviation detecting member is controlled by the shaft of the deviation adjusting roller. The displacement movement of the end portion can be surely converted, and the deviation correction operation can be favorably performed.

According to the invention of claim 7, a biasing force acting in a direction opposite to the displacement is applied to the displacement of the shaft end portion in any direction in the deviation correcting operation of the flat belt. The position of the shaft end portion of the deviation adjusting roller is appropriately set by the balance between the moving force of the shaft end portion by the roller end portion displacement means and the urging force.

[0026]

【Example】

(First Embodiment) Next, a first embodiment of the present invention will be described in detail with reference to the drawings. Further, in this embodiment, a case where the belt driving device according to the present invention is mounted on a belt conveyor will be described.

1 to 3 show the overall structure of the belt conveyor 1 according to this embodiment. FIG. 1 shows a plurality of rollers 3 around which a conveyor belt 2 as a flat belt is stretched.
7 is a cross-sectional view taken along a plane extending in a direction orthogonal to the axis of FIG. 7, FIG. 2 is a cross-sectional view at a position corresponding to line II-II in FIG. 1, and FIG. 3 is a line III-III in FIG. The cross-sectional views at the positions corresponding to are respectively shown.

As shown in these figures, the belt conveyor 1 according to this embodiment is constructed by incorporating a belt drive device 9 into a main body casing 8.

First, the main casing 8 will be described. The body casing 8 is formed by integrally assembling a chassis 11 on the upper surface of a body cover 10. The main body cover 10 is made of sheet metal and includes a back cover 10a having a U-shaped cross-section whose upper side in FIG. 1 and left and right sides in FIGS. 2 and 3 are open. The side plates 10b and 10c are screwed together. As a result, the body cover 10 is formed in a container shape with only the upper side opened. In addition, each side plate 10b, 10
Spacer brackets 10d, 10d, ... Are attached to a plurality of positions of c facing each other, and a spacer shaft 10e extending in the vertical direction of the paper surface of FIG. 1 is installed between the facing spacer brackets 10d, 10d.
As a result, the distance between the side plates 10b and 10c is kept constant and the rollers 3 to 7 are stably supported.

On the other hand, the chassis 11 is arranged so as to be bolted to the upper portion of the body cover 10 so as to cover the upper opening of the body cover 10. Specifically, this chassis 11
2 are chassis side plates 11a and 11b having a substantially L-shaped cross section, which are attached to the left and right upper edges of the body cover 10 in FIG.
And a plurality of (three in this example) plate members are combined by caulking, and the chassis upper plates 11c, 11 are laid between the chassis side plates 11a, 11b and extend in the horizontal direction.
c, ... And. Also, these chassis side plates 1
1a, 11b and the chassis upper plate 11c are the chassis 11
It is made of aluminum to reduce the overall weight.

Next, the belt drive device 9 incorporated in the main body casing 8 will be described. As shown in FIG. 1, the belt driving device 9 is composed of five rollers 3 to 7 around which a conveyor belt 2 is movably provided.
Each of the rollers 3 to 7 is rotatable about axes that are substantially parallel to each other and extends in the left-right direction in FIGS. 2 and 3, and both left and right ends in the length direction are rotatably supported by a bearing or the like (not shown). Small-diameter shaft portions 3a to 7a, 3b to 7
The roller main body portion 3 formed in b and having a large diameter in the other portions
It is formed in c-7c.

The rollers 3 to 7 will be described with reference to FIG.
3 is a drive roller. The driving roller 3 has a roller body 3c in which a rubber sheet is wound around a metal cylindrical member. In addition, each shaft portion 3a, 3
b is rotatably supported by side plates 10b and 10c of the main body cover 10, and one shaft portion 3a located on the right side in FIGS. 2 and 3 is projected from the side plate 10b of the main body cover 10. The sprocket 3d is attached integrally with the sprocket. As shown in FIG. 1, the sprocket 3d is linked to a motor 12 provided inside the main body cover 10 via a chain 13. That is,
A sprocket 12b is attached to the drive shaft 12a of the motor 12 so as to rotate together.
A chain 13 is stretched over 12b, and the driving force of the motor 12 is transmitted to the drive roller 3 via the chain 13 (see the arrow in FIG. 1). In the belt conveyor 1 of this example, the drive roller 3 is adapted to rotate counterclockwise in FIG. That is, due to this rotation, the conveyance direction of the conveyed article by the conveyor belt 2 is set in the direction from the head roller 4 to the tail roller 5. The sprocket 3d, 12b and the chain 13 are covered with a cover 14 having a U-shaped cross section attached to the outer surface of the side plate 10b.

Reference numerals 4 and 5 in FIG. 1 denote a head roller and a tail roller provided on both sides of the chassis 11 in the longitudinal direction (left and right direction in FIG. 1). Each of the rollers 4 and 5 has a roller body 4c, 5c made of a metal cylindrical member, and the shafts 4a, 5a, 4b, 5
b is rotatably supported by the chassis side plates 11a and 11b.

Further, 6 in FIG. 1 is a deviation control roller as a deviation adjusting roller. This deviation control roller 6
Has a roller body 6c made of stainless steel, and a shaft 6a located on the right side in FIGS. 2 and 3 is supported by a deviation adjusting mechanism 15 described later. Then, the deviation of the conveyor belt 2 is controlled by the displacement of the one shaft end 6a.

Reference numeral 7 in FIG. 1 denotes a variable roller which is a characteristic member of this example. This variable roller 7
Has a roller body portion 7c made of stainless steel, and the shaft portion 7
The shaft center position changing mechanism 16 which is a roller shaft center adjusting means for a and 7b can be moved freely.

Five rollers 3 to 7 arranged in this way
On the other hand, the conveyor belt 2 has its inner surface (non-conveying surface)
Drive roller 3, head roller 4 and tail roller 5
Of each of the roller main body portions 3c, 4c, 5c, and the outer surface (conveying surface) of the deviation control roller 6 and the variable roller 7 are contacted with the roller main body portions 6c, 7c of The driving roller 3 is rotated by the driving of the motor 12 to run.

Next, the supporting state of the deviation control roller 6 will be described in detail. As shown in FIG. 6, the deviation control roller 6
The left and right shaft portions 6a, 6b are substantially L-shaped plate members each having vertical portions 20a, 21a and supporting portions 20b, 21b bent outward from the upper edges of the vertical portions 20a, 21a. Are supported by the respective supporting frames 20 and 21. Further, as shown in FIG. 2, each of the support frames 2
The support parts 20b and 21b of 0 and 21 are the chassis side plates 1
1a, 11b is screwed to each vertical portion 20a,
21a are opposed to each other in the left-right direction in FIG. The deviation control roller 6 is installed between the vertical portions 20a, 21a of the supporting frames 20, 21 facing each other. The support structure for the left and right shaft portions 6a and 6b will be described below.

First, the supporting structure of the shaft portion 6b on the left side of the deviation control roller 6 in FIGS. 2 and 6 will be described in detail. Of the support frames 20 and 21, the first support frame 20 disposed on the left side in FIGS. 2 and 6 has a shaft portion 6b on the left side of the deviation control roller 6 at the center of the vertical portion 20a.
2 into which a shaft is inserted to rotatably support the shaft portion 6b.
0c is opened. The support hole 20c is formed as a long hole, and the extension direction thereof is set to be a direction orthogonal to the tangent line at the contact position of the conveyor belt 2 on the outer peripheral surface of the deviation control roller 6. The shaft portion 6b of the motion control roller 6 can be displaced and moved in this direction.
Therefore, when the deviation control roller 6 moves upward (in the direction of arrow A in FIGS. 1 and 2) along the support hole 20c, the tension of the conveyor belt 2 increases.

Further, the supporting portion 20b of the first supporting frame 20 is provided with a spring locking piece 20d formed by bending a part thereof downward, and the spring locking piece 20d and the shaft portion. A first tension spring 22, which is a coil spring, is erected in a stretched state between 6b and 6b. Therefore, the urging force of the first tension spring 22 causes the shaft portion 6b of the deviation control roller 6 to move.
The urging force in the direction of the arrow A in FIGS. 1 and 2 is applied to the belt so that a predetermined belt tension is obtained.

Next, the supporting structure of the shaft portion 6a on the right side of the deviation control roller 6 in FIGS. 2 and 6 will be described in detail. The second support frame 21 disposed on the right side in FIGS. 2 and 6 has a relatively large opening 21c formed at the center of the vertical portion 21a as shown in FIG. Also, this opening 2
A spring locking piece 21d is provided at the upper edge of 1c and is bent outward from the upper edge. Also,
Pins P, which are used when slidably caulking and supporting a tension plate 25, which will be described later, are provided at three locations around the opening 21c of the second support frame 21.
Caulking holes 21e, 21e, ... For caulking P, ... Are formed.

On the outer side of the vertical portion 21a of the second support frame 21, the tension plate 25 which is slidably movable with a predetermined stroke with respect to the second support frame 21 is assembled. The tension plate 25 includes a vertical portion 25a that is superposed on the outer surface of the vertical portion 21a of the second support frame 21, and a spring locking piece 25b that is bent outward from the lower end of the vertical portion 25a. A shaft portion 6a on the right side of the deviation control roller 6 is inserted in the center of the vertical portion 25a, and a support hole 25c for rotatably supporting the shaft portion 6a is opened. The support hole 25c is a long hole,
The extension direction is set in a direction parallel to the tangent line at the contact position of the conveyor belt 2 on the outer peripheral surface of the deviation control roller 6, and the shaft portion 6a of the deviation control roller 6 can be displaced and moved in this direction. Has been done. That is, it is set in a direction orthogonal to the support hole 20c of the first support frame 20 described above.

Further, the tension plate 25 has caulking holes 21e, 21e, ... Of the second supporting frame 21.
Pin insertion holes 25d, 25d that are elongated holes at positions corresponding to
Are formed. The extension direction of the pin insertion hole 25d is orthogonal to the support hole 25c, that is, the support hole 20 of the first support frame 20 described above.
It is set in the same direction as the extension direction of c, the pins P, P, ... Are inserted over the pin insertion holes 25d, 25d and the caulking holes 21e, 21e, and the second support frame 21
Between the second support frame 21 and the slide washers 26, 26, ... Made of a self-lubricating material, through which the pin P is inserted, are arranged between the second support frame 21 and the tension plate 25. By crimping, the tension plate 25 is slidable with respect to the second support frame 21 by the dimension of the pin insertion hole 25d in the longitudinal direction. That is, the tension plate 25 is slidable in the same direction as the extension direction of the support hole 20c of the first support frame 20 described above, and with this movement, the displacement movement of the right shaft portion 6a of the deviation control roller 6 is performed. Is possible.

Further, a locking pin mounting hole 25e for mounting the detection belt locking pin 28 is formed in the tension plate 25 below the support hole 25c at a position slightly displaced to the right in FIG. ing. The detection belt locking pin 28 is attached to the tension plate 25 by crimping one end of the detection belt locking pin 28 into the locking pin attachment hole 25e, and the tension plate 25 is assembled to the second support frame 21. Then, the opening 21c formed in the second support frame 21 is inserted to project from the vertical portion 21a of the second support frame 21 to the deviation control roller 6 side (Fig. 2 and (See FIG. 3).

Further, screw holes 25f, 25f for mounting a back tension holder 30, which will be described later, are formed at two positions above and below the support hole 25c.

As shown in FIGS. 5 and 6, a second tension spring 27, which is a coil spring, is extended between the spring locking pieces 21d and 25b. Therefore, the urging force of the second tension spring 27 causes the shaft portion 6a of the deviation control roller 6 to move.
1 through the tension plate 25 in FIG.
A biasing force in the direction (direction A'in FIG. 2) is applied to obtain a predetermined belt tension.

The tension springs 22 and 27 described above are set so that the left and right biasing forces are different. That is, the biasing force of the first tension spring 22 attached to the first support frame 20 is set to be larger than the biasing force of the second tension spring 27 attached to the second support frame 21. As a result, the belt tension on the left side in FIG. 2 is configured to be larger than the belt tension on the right side, and when the conveyor belt 2 is running, the belt tension is increased from the higher side to the lower side, that is, the direction of arrow B in FIG. The configuration is such that the conveyor belt 2 is biased. By this, the bias application means in the present invention is configured. Further, as the configuration of the offset imparting means, the circumferential lengths of the left and right ends of the belt may be changed, or at least one of the rollers 3 to 7 may be inclined to move in the direction of arrow B in FIG. A bias can be made.

As shown in FIG. 4, the second support frame 21
The back tension holder 30 is screwed to the inner surface of the vertical portion 21a. The back tension holder 30 is made of a lubricious engineering plastic material such as a polyastral resin or a nylon resin, and is provided with a shaft end supporting portion 31 and a spring holding portion 32. A slide elongated hole 31a having a shape substantially matching the shape of the support hole 25c formed in the tension plate 25 is formed. The spring holding portion 32 is formed with a shaft insertion hole 32a that penetrates in the longitudinal direction of the spring holding portion 32 and has one end open to the slide long hole 31a.

A back tension shaft 33 is inserted in the shaft insertion hole 32a. The back tension shaft 33 comes into contact with the outer peripheral surface of the shaft portion 6a of the deviation control roller 6 when the tip of the back tension shaft 33 faces the slide long hole 31a. In addition, a large diameter portion 33a having an outer diameter dimension that substantially matches the inner diameter dimension of the shaft insertion hole 32a is formed at an intermediate portion of the back tension shaft 33 in its extension direction. And this back tension shaft 3
A back tension spring 34 is inserted into the shaft insertion hole 32a from the back side of the back tension shaft 3, and the back tension spring 34 is brought into contact with the back surface of the large diameter portion 33a of the back tension shaft 33. Further, a stopper 35 is attached to the spring holding portion 32 from the back side of the back tension spring 34. The stopper 35 is formed in a substantially U shape so as to face the lower end of the shaft insertion hole 32a, and has small-diameter openings 35a, 35a corresponding to the screw hole 32b formed in the spring holding portion 32. Has been formed. Then, the back tension shaft 33 and the back tension spring 3 are inserted into the shaft insertion hole 32a.
4 is inserted, the shaft insertion hole 32a is closed by the stopper 35, and the set screw 3 is extended over the opening 35a of the stopper 35 and the screw hole 32b of the spring holding portion 32.
6 is screwed on. As a result, the back tension spring 34 is housed in a compressed state between the large diameter portion 33a of the back tension shaft 33 and the stopper 35, and the back tension spring 34 is biased by the back tension spring 34. The tip end of the tension shaft 33 is the deviation control roller 6
The shaft portion 6a is pressed in the direction of arrow C in FIG. The back tension holder 30 configured as described above has the screw hole 31 formed in the shaft end support portion 31.
b, 31b and the tension plate 25
Is attached to the tension plate 25 by screws 37, 37 screwed into the screw holes 25f, 25f of the vertical portion 25a. That is, the second support frame 21 is arranged so as to be held between the tension plate 25 and the second support frame 21. In this way, the tension unit 39 that applies a biasing force to the shaft portion 6a of the deviation control roller 6 is configured.

Next, the shaft portion 6a on the right side of the deviation control roller 6
The deviation adjusting mechanism 15 provided in the above will be described. Figure 5
Further, as shown in FIG. 6, a deviation detecting ring 40 as a deviation detecting member is arranged at a position on the right side shaft portion 6a of the deviation control roller 6 inside the second support frame 21. The deviation detecting ring 40 has an insertion hole 40a formed in the center thereof, the insertion hole 40a having substantially the same diameter as that of the shaft portion 6a of the deviation control roller 6. The shaft portion 6a of the deviation control roller 6 is inserted into the insertion hole 40a. By being inserted, the shaft portion 6a is supported so as to be rotatable coaxially with the deviation control roller 6 and independently of the deviation control roller 6.
The deviation detection ring 40 is formed of urethane elastomer or the like having a high friction coefficient with the conveyor belt 2 and excellent wear resistance. The inner edge surface of the deviation detecting ring 40 is arranged close to the end surface of the roller body portion 6c of the deviation control roller 6 with a small gap. Further, in the deviation detecting ring 40, the outer diameter of the portion of the deviation control roller 6 facing the end surface of the roller body 6c is set to be the same as the outer diameter of the deviation control roller 6, and the roller body 6c is formed. Riding surface 40b inclined in a taper shape, the diameter of which gradually increases as the distance from the end surface increases.
have. When the conveyor belt 2 is thereby deviated in the direction of arrow B in FIG. 2, the deviation causes the end edge portion of the conveyor belt 5 to ride on the riding surface 40b of the deviation detecting ring 40. . A boss portion 40c is formed on the outer end surface of the deviation detecting ring 40.

A detection ring pin 40d is provided upright on the end surface of the deviation detection ring 40 facing the second support frame 21. This detection ring pin 4
0d is formed in the same shape as the detection belt locking pin 28 provided on the tension plate 25.

A detection belt 41 is stretched between the detection belt locking pin 28 provided on the tension plate 25 and the detection ring pin 40d provided on the deviation detection ring 40. This detection belt 4
Numeral 1 is a flexible film-shaped strip, and both ends thereof are wound to form locking portions 41a and 41b. The respective locking portions 41a and 41b are connected to the pins 28,
A part of the detection belt 41 is wound around the boss portion 40c of the deviation detection ring 40 while being locked by the 40d.

E-rings 38, 38 are fitted in the outer position of the deviation detecting ring 40 and the outer position of the tension plate 25 of the shaft portion 6a of the deviation control roller 6, respectively, so that the E-rings 38, 38 are biased against the respective members 40, 21, 25. Motion control roller 6
The shaft portion 6a is prevented from coming off.

With such a configuration, the conveyor belt 2 is moved by the deviation (in the direction of arrow B in FIG. 2) accompanying the traveling of the conveyor belt 2, so that the deviation detection ring 40 rides on the riding surface 4 of the deviation detection ring 40.
0b and the rotational torque acts on the deviation detection ring 40, the deviation detection ring 40 is rotated to wind the detection belt 41 around the boss portion 40c of the deviation detection ring 40, thereby causing the deviation control roller 40 to rotate. The shaft end on the right side of 6 is moved along the support hole 25c formed of the long hole and displaced in the direction away from the shaft end of the tail roller 5, that is, in the direction of arrow D in FIG. Has become. That is, the conveyor belt 2 is wound in the circumferential direction of the deviation control roller 6 in a state in which the deviation control roller 6 is tilted leftward in the belt traveling direction, so that the conveyor belt 2 in FIG. It is configured to move in the direction of arrow E, which is the opposite direction of arrow B. As a result, roller end displacing means for displacing the shaft end of the deviation control roller 6 in the direction orthogonal to the roller axis when the rotational torque acts on the deviation detection ring 40 is constituted. That is, when the right shaft end of the deviation control roller 6 is displaced in the D direction, a deviation component opposite to the initial deviation component (B direction component) is generated and cancels out with the initial deviation component. The shaft end of the deviation control roller 6 is displaced until they match.

Further, as described above, the deviation control roller 6
Since the urging force of the back tension spring 34 is exerted on the shaft member 6a of the back tension shaft 33 through the back tension shaft 33, when the riding operation of the conveyor belt 2 onto the detection ring 40 is canceled, the back tension spring The right shaft end of the shaft member 6a of the deviation control roller 6 is moved to a predetermined position by the biasing force of the roller 34 (position shown in FIG. 1).
It is supposed to be returned to. With such a configuration,
When the deviation component in the opposite direction due to the displacement of the shaft end portion of the deviation control roller 6 becomes larger than the initial deviation component, the conveyor belt 2
Starts to deviate in the opposite direction, and the amount of the detection ring 40 riding on the riding surface 40b decreases, so the detection ring 40
Is also reduced, and as a result, the back tension spring 34 reduces the displacement amount of the shaft end portion of the deviation control roller 6.

Then, as a characteristic configuration of this example,
The shaft center position changing mechanism 16 moves the shaft center position of the variable roller 7. As shown in FIGS. 1 and 7, the shaft center position changing mechanism 16 (FIG. 7 shows a state in which the deviation adjusting mechanism 15 is removed in the cross-sectional view of FIG. 1) is used for each shaft of the variable roller 7. A variable roller bearing 45 is provided as a bearing member that rotatably supports the portions 7a and 7b. The variable roller bearing 45 has a bearing groove 45a whose upper side is opened and which is recessed in a U shape. A through hole 45b is formed at the lower end of the variable roller bearing 45 so as to penetrate in a direction orthogonal to the extending direction of the variable roller 7 supported by the bearing groove 45a.

On the other hand, the shaft portions 7a, 7 of the variable roller 7 are
A screw member 46 as a guide member that extends in a direction orthogonal to the extension direction of the variable roller 7 and has a male screw formed on the outer peripheral surface is disposed below b. The screw member 46 has one end on the left side in FIG. 7 fixed to the screw portion support member 47 fixed to each side plate 10b, 10c constituting the main body cover 10, while one end on the right side of the back cover 10a. It extends to a position near the vertical wall. Then, the screw member 4 is inserted into the through hole 45b of the variable roller bearing 45.
The variable roller bearing 45 is arranged so that 6 is inserted.

Further, a variable roller adjusting member 48 is engaged with one end portion of the screw member 46 on the right side in FIG. The variable roller adjusting member 48 has a female thread formed on the inner peripheral surface, one end of which is in contact with the side surface of the variable roller bearing 45 while being screwed into the screw member 46 and which penetrates the back cover 10 a to the outside of the main body cover 10. Shaft 48 extending to
a and a handle portion 48b fixed to the end portion of the shaft portion 48a on the right side in FIG. As described above, since the shaft portion 48a is screwed into the screw member 46, when the handle portion 48b is rotated, the variable roller adjusting member 48 moves forward and backward in the extension direction of the shaft portion 48a (left and right direction in FIG. 7). As a result, the position of the variable roller bearing 45 is regulated, and the position of the shaft center of the variable roller 7 is changed. That is, the shaft portion 4
When 8a is moved forward (moved to the left in FIG. 7), the variable roller 7 is moved in a direction approaching the deviation control roller 6, and conversely, the shaft portion 48a is moved backward (to the right in FIG. 7). When moved, the variable roller 7 is moved in a direction away from the deviation control roller 6 by the pressure from the conveyor belt 2. Since such a structure is provided at both ends of the variable roller 7,
By operating the variable roller adjusting member 48, the axial center position of the variable roller 7 and its inclination state can be arbitrarily changed.

Next, the belt conveyor 1 having the above structure
The operation of will be described. The drive roller 3 rotates as the motor 12 is driven, which causes the conveyor belt 2 to rotate.
Runs. Then, by placing the conveyed article on the traveling conveyor belt 2, the conveyed article is conveyed.

In such a conveying operation, the conveyor belt 2 is always biased in the B direction in FIG. 2 because the left and right belt tensions are different as described above. That is, the conveyor belt 2 is biased toward the deviation detection ring 40 while traveling.

When the end portion of the conveyor belt 2 rides on the riding surface 40b of the deviation detecting ring 40 due to the deviation of the conveyor belt 2, it is between the conveyor belt 2 and the riding surface 40b of the deviation detecting ring 40. The friction detection force causes the deviation detection ring 40 to rotate, and the rotation causes the detection belt 41 to be wound up.

Due to the winding of the detection belt 41, the shaft end portion of the deviation control roller 6 on which the deviation detection ring 40 is arranged is displaced in the direction of arrow D in FIG. Due to this displacement, the conveyor belt 2 travels while being wound in the direction opposite to the B direction (E direction), and the deviation of the conveyor belt 2 in the B direction is limited. Along with that
Due to the displacement of the shaft portion 6a, the back tension shaft 33 is moved in the direction of coming out of the slide long hole 31a, and thereby the back tension spring 34 is compressed and the spring reaction force is also increased. Back tension spring 34
The amount of displacement of the deviation control roller 6 is regulated by the balance with the spring reaction force of 1, and the position of the end portion of the conveyor belt 2 is maintained at a certain fixed position.

Since the conveyor belt 2 travels in this way, a large deviation of the conveyor belt 2 is prevented, and for example, the deviation amount of the conveyor belt 2 can be suppressed to several mm or less. That is, the deviation amount can be made small by performing the deviation correction automatically while preliminarily deviating the conveyor belt 2 in one direction, and the conveyor belt 2 can be stably run. It is possible to stably convey an object to be conveyed.

As a characteristic operation of this embodiment, when the amount of riding of the conveyor belt 2 on the deviation detection ring 40 becomes extremely large and a sufficient deviation correction operation cannot be performed, a situation occurs. By operating the handle portion 48b of each variable roller adjusting member 48 to adjust the axial center position of the variable roller 7, the riding amount of the conveyor belt 2 is reduced. Specifically, by operating the variable roller adjusting member 48 located on the right side in FIGS. 2 and 3,
The shaft center on the right side of the variable roller 7 is moved in the direction toward the deviation control roller 6, and the belt tension at this portion is increased.
As a result, the conveyor belt 2 is deviated (moved in the direction of arrow E) from the side having a large belt tension to the side having a small belt tension, so that the above-mentioned riding amount is reduced and a sufficient deviation correction operation can be performed. Become. Further, not limited to this operation, the variable roller adjusting member 48 located on the left side in FIG. 2 is operated to move the shaft center on the left side of the variable roller 7 in the direction away from the deviation control roller 6, and at this portion. The riding amount can be reduced by reducing the belt tension.

Further, these variable roller adjusting members 48 are
Not only is the operation performed to ensure that the deviation correction operation described above is performed, but the belt tension of the entire conveyor belt 2 can also be adjusted by this operation. That is, it has the same function as the tension springs 22 and 27 described above. That is, both variable roller adjusting members 48,
By operating 48 to move the shaft centers on both sides of the variable roller 7 in the direction toward the deviation control roller 6, the belt tension can be increased, and conversely, the shaft centers on both sides of the variable roller 7 can be deviated. The belt tension can be reduced by moving the control roller 6 away from the control roller 6.

As described above, according to the configuration of this embodiment, the eccentric conveyor belt 2 rides on the eccentricity detection ring 40,
Thereby, the rotational force generated in the deviation detecting ring 40 is converted into the moving force of the shaft end portion of the deviation control roller 6 to correct the deviation of the conveyor belt 2, and the deviation can be automatically detected and corrected. With respect to the belt conveyor 1 configured as described above, the control range of the deviation correction operation can be expanded, and the practicality of the present device can be improved.

In this example, the belt-shaped detection belt 41 is used as a member for converting the rotational force of the deviation detecting ring 40 into the moving force of the shaft portion 6a. However, the present invention is not limited to this, and deviation detection is performed. A string or the like may be used as long as it can be wound around the ring 40.

-Experimental Example- Next, an experiment conducted to confirm the above-mentioned effect and the result thereof will be described. This experiment is for conveyor belt 2
This is done in order to confirm the belt running state when the variable roller adjusting members 48, 48 are operated in the running state. FIG. 8 is a schematic diagram of the belt conveyor 1 used in this experiment. In this experiment, the lower side in FIG. 8 is the front side and the upper side is the rear side.

First, as the conditions of this experiment, the taper angle of the riding surface of the deviation detection ring 40 is 8 °, the biasing force of each tension spring 22 and 27 is 2 kgf, and the biasing force of the back tension spring 34 is 1.2 kgf. In order to perform the initial deviation, the circumference of the conveyor belt 2 on the front side is set to be longer than the circumference of the rear side. Then, the belt was made to run continuously for 8 hours while operating the variable roller adjusting members 48, 48 at an unloaded state and at a speed of 17.1 m / min.

Next, the results of this experiment will be described.
The variable roller adjusting members 48, 48 are not operated, that is,
As shown by the solid line in FIG. 8, the axis of the variable roller 7 is
When kept parallel to the axes of the other rollers, an extremely stable running state with almost no deviation was obtained. Specifically, the ride amount of the conveyor belt 2 on the deviation detection ring 40 was 5.5 mm, and the runout amount in the belt width direction in this state was 0.5 mm.

On the other hand, as an experimental result when the variable roller adjusting members 48, 48 are operated, FIG. 9 shows a swinging state of the conveyor belt 2 in the width direction. Area G in FIG. 9
Is the width direction of the conveyor belt 2 when the front side is moved forward by 4 mm and the rear side is moved backward by 4 mm as shown by a virtual line α in FIG. When the front side is moved backward by 4 mm and the rear side is moved forward by 4 mm as shown by the phantom line β in FIG. 8, in the area I, the front side is moved backward by 2 mm and the rear side is moved. It shows a swinging state of the conveyor belt 2 in the width direction when it is advanced by 2 mm. In this case, as a specific lateral deviation amount and runout amount, the lateral deviation amount of the belt when the front side is moved forward by 4 mm and the rear side is moved backward by 4 mm is 1.5 mm,
The amount of runout is 1.0 mm, and the amount of lateral displacement of the belt is 1.9 mm when the front side is retracted 4 mm and the rear side is advanced 4 mm.
The shake amount was 1.0 mm.

From this experimental result, it was confirmed that the positioning in the belt width direction can be arbitrarily set by operating the variable roller adjusting members 48, 48.
Therefore, when the amount of eccentric movement of the conveyor belt 2 on the eccentricity detection ring 40 increases, the eccentricity can be reduced by operating the variable roller adjusting members 48, 48, and sufficient eccentricity correction can be performed. It will be possible to make an action. In other words, this belt conveyor 1
When there is a processing error in each member that constitutes the belt conveyor, or when the friction coefficient between the belt 2 and the deviation detection ring 40 changes due to the use conditions of the belt conveyor 1 or changes with time, etc. Even if 2 is largely deviated, the variable roller adjusting members 48, 4
It is possible to obtain an optimum traveling state simply by operating 8.

The inventor of the present invention conducted various experiments by changing the above conditions. In any case, by operating the variable roller adjusting members 48, 48, the belt width direction is changed. It was confirmed that the positioning of can be set arbitrarily.

That is, the belt conveyor 1 is designed to automatically detect and correct the deviation of the belt 2 as described above.
In the above, the provision of the variable roller 7 whose axial center position is variable is an extremely effective means, and is a configuration that can greatly improve the practicality of the present apparatus.

Next, another experimental example will be described. This experiment was performed from the viewpoint of which of the above-mentioned plurality of rollers 3 to 7 is the best one for performing the deviation correction operation by functioning as the deviation adjusting roller in the present invention. It is an experiment. Then, the inventor of the present invention applies the deviation detection ring 40 to the head roller 4 and the tail roller 5 in addition to the configuration of the above-described embodiment, while conveying the conveyed object by the conveyor belt 2, The deviation correction operation was performed by displacing the shaft end of the roller.

As a result, when the head roller 4 and the tail roller 5 were made to function as the deviation adjusting rollers, the deviation correction operation could not be sufficiently performed, whereas the driving rollers as in the above-described embodiment. When the vent roller 6 (deviation control roller in the embodiment) located at a position close to 3 was used as the deviation adjusting roller, good deviation correction operation was performed.

The reason for this is that the head roller 4 and the tail roller 5 pass the upper side of the conveyed product, so that the displacement amount of the shaft end cannot be properly adjusted due to the influence of the weight of the conveyed product. On the other hand, it is considered that the bent roller 6 has almost no effect. Further, the head roller 4 and the tail roller 5 have a long distance from the drive roller 3, and the shaft end portion is displaced to move the conveyor belt 2
Even if you give a deviation component in the opposite direction to the initial deviation,
The conveyor belt 2 is bent between the drive roller 3 and this component, and this component is absorbed, and sufficient deviation correction cannot be performed.
It is also possible that this situation does not occur due to the short distance between the and.

From the above experimental results, in order to obtain the most ideal deviation correction operation in this apparatus, the deviation adjustment of the vent roller 6 located near the drive roller 3 is performed as in the above-described embodiment. It was confirmed that it is effective to use it as a roller.

(Second Embodiment) Next, a second embodiment of the present invention will be described in detail with reference to the drawings. In addition, this embodiment is a modification of the deviation adjusting mechanism 15, and other configurations are similar to those of the above-described first embodiment. Therefore, only the differences from the first embodiment will be described here. To do. Also, FIGS.
FIG. 15 corresponds to FIGS. 1 to 7 in the above-described first embodiment, respectively.

The belt conveyor 1 according to this example is a motor 1
2 can rotate in the normal and reverse directions, and the traveling direction of the conveyor belt 2 can also rotate in the normal and reverse directions in accordance with the normal and reverse rotation. FIG.
Reference numeral 17 in 0 is a forward / reverse conveyance changeover switch attached to the main body cover 10.

For this reason, the deviation adjusting mechanism 15 of the present embodiment can perform the same deviation correction operation as that of the first embodiment, regardless of whether the conveyor belt 2 travels forward or backward. The configuration for performing this deviation correction operation will be described below.

As shown in FIG. 14, in this example, instead of the above-mentioned detection belt 41, a detection cord 50 as a winding member is used.
Has been adopted. Both ends of the detection string 50 are wound to form locking portions 50a, 50a, and the detection string 50 is wound around the boss portion 40c of the deviation detection ring 40 in two winding states.

As shown in FIG. 13, the left and right sides of the lower side of the support hole 25c in the tension plate 25 of this example are two.
Lock pin mounting holes 25e, 25e for mounting the pair of detection belt locking pins 28, 28 are formed at the locations. Then, the detection belt locking pins 28, 28 are
One end thereof is attached to the tension plate 25 by crimping the locking pin attachment holes 25e, 25e, respectively. When the tension plate 25 is assembled to the second support frame 21, the second support frame is attached. The openings 21c formed in the second support frame 21 are inserted to project from the vertical portion 21a of the second support frame 21 to the deviation control roller 6 side (FIGS. 11 and 12).
reference).

The locking portions 50a, 50a at both ends of the detection cord 50 are locked by the locking pins 28, 28, respectively.

Further, as shown in FIGS. 14 and 17, on the outer peripheral surface of the boss portion 40c of the deviation detecting ring 40, a cord fitting 51 for fixing a part of the cord member 50 to the boss portion 40c.
Is installed. The cord fitting 51 is the boss portion 4 described above.
It is made of a plate material formed in an arc shape following the shape of the outer peripheral surface of 0c, and a screw hole 51a is formed in the center thereof.
Then, the cord fitting 51 sandwiches a part of the cord member 50 with the boss portion 40c, and the cord member 50 is fixed to the outer peripheral surface of the boss portion 40c at the sandwiched portion.
It is fixed to the boss portion 40c with a screw 52.

Further, as shown in FIGS. 13 and 16, the back tension holder 30 is provided with spring holding portions 32 and 32 'on both sides of the shaft end supporting portion 31, and the upper side of the shaft end supporting portion 31 is provided. Spring retainer 32 located at
The back tension shaft 33 'similar to that described above is also used for
Back tension spring 34 'and stopper 35'
Is provided. With such a configuration, the shaft portion 6a of the deviation control roller 6 inserted into the slide long hole 31a of the shaft end support member 31 of the back tension holder 30 is
The urging force of the back tension shafts 33, 33 'is applied from both sides in the extension direction of the back tension holder 30.

Next, the deviation correcting operation by the above-mentioned structure will be described. In FIG. 10, when the driving roller 3 is driven in the counterclockwise direction, the conveyed object is conveyed by the conveyor belt 2 from the head roller 4 side to the tail roller 5 side. At this time, when the conveyor belt 2 deviates and rides on the riding surface 40b of the deviation detection ring 40, the deviation detection ring 40 rotates clockwise in FIGS. 10 and 16. During this rotation, the detection string 5
No. 0 has a part thereof fixed to the boss portion 40c by the metal fittings 51, and therefore does not slip on the boss portion 40c.
The front side of FIG. 16 in FIG. That is, the deviation detecting ring 40 rotates (arrow K in FIG. 16) without slackening the detection string 50, and the shaft portion 6
a is displaced in the L direction in FIG. Due to this displacement, the conveyor belt 2 travels while being wound in the direction opposite to the B direction in FIG. 11, and the deviation of the conveyor belt 2 in the B direction is limited. Along with that
Due to the displacement of the shaft portion 6a, one back tension shaft 33 (on the right side in FIG. 16) is moved in the direction of coming out of the slide long hole 31a, whereby the back tension spring 34 is compressed and the spring reaction force also increases. The displacement amount of the deviation control roller 6 is regulated by the balance between the winding force of the detection cord 50 and the spring reaction force of the back tension spring 34, and the position of the end portion of the conveyor belt 2 is maintained at a certain fixed position. become.

When the drive roller 3 is driven in the clockwise direction in FIG. 10 by operating the forward / reverse transport changeover switch 17, the transported product is transported from the tail roller 5 side to the head roller 4 side by the conveyor belt 2. Will be. At this time, when the conveyor belt 2 deviates and rides on the riding surface 40b of the deviation detection ring 40, the deviation detection ring 40 rotates counterclockwise in FIGS. 10 and 16. At the time of this rotation, as for the detection cord 50, the one on the front side of the deviation detection ring 40 in FIG.
It is wound up to 0c. That is, the deviation detecting ring 40 rotates without slackening the detecting string 50 (arrow M in FIG. 16).
Meanwhile, the shaft portion 6a is displaced in the N direction in FIG.
Due to this displacement, the conveyor belt 2 travels while being wound in the direction opposite to the E direction in FIG. 11, and the deviation of the conveyor belt 2 in the E direction is limited. In this case, due to the displacement of the shaft portion 6a, one back tension shaft 33 '(left side in FIG. 16) is moved in a direction of coming out of the slide long hole 31a', and thereby the back tension spring 34 'is compressed. The spring reaction force also increases, so the detection cord 50
The amount of displacement of the deviation control roller 6 is regulated by the balance between the take-up force and the spring reaction force of the back tension spring 34 ', and the position of the end portion of the conveyor belt 2 is maintained at a certain fixed position. .

As described above, according to the structure of this embodiment, even when the traveling direction of the conveyor belt 2 is variable in the forward and reverse directions, it is possible to always perform a good deviation correction operation. Since it is not necessary to perform a switching operation on the deviation adjusting mechanism 15 at the time of switching, the labor of operation is saved, and the practicality of this type of belt driving device is improved as in the case of the first embodiment described above. Can be increased.

Further, in this example, as a structure for surely avoiding the loosening of the detection cord 50, one pin 28 and the detection cord 50 are provided.
A spring may be extended between the locking portion 50a and the locking portion 50a.

Further, a pair of back tension springs 34, 3 incorporated in the back tension holder 30.
4 ′ is not limited to the one having the same biasing force, but may have a different biasing force.

(Modification) Next, a modification of the second embodiment will be described. In the modified example shown below, the outline of the apparatus is the same as that described above, and therefore only the characteristic part will be described here.

First, as a first modification, as shown in FIG. 18, the cord fitting 51 (see FIG. 17) is not used. In order to realize such a configuration, it is necessary that slip does not occur between the outer peripheral surface of the boss portion 40c of the deviation detection ring 40 and the detection string 50.
Therefore, for example, by winding a rubber sheet 53 around the outer peripheral surface of the boss portion 40c or adopting a high-friction material as the detection string 50, the friction coefficient between the two is set to be high, thereby eliminating the string metal fitting 51. It is possible to reduce the number of parts and the number of assembling work steps.

Next, a second modification will be described. In the second modification, as shown in FIG. 19, two detection strings 50b and 50c are used. That is, the locking portions 50a, 50a at one end of each of the detection strings 50b, 50c are locked to the locking pins 28, 28, respectively, and the other end is opposite to the boss portion 40c of the deviation detection ring 40. The ends of the boss 40c and the screws 54,
It is fixed by 54.

With this structure, as in the second embodiment, the detection strings 50b and 50c are wound and unwound with the rotation of the deviation detection ring 40. Even when the traveling direction of the conveyor belt 2 is variable in the forward and reverse directions, it is possible to always perform a good deviation correction operation.

Next, a third modification will be described. The third modification is a modification of the back tension holder 30. As shown in FIG. 20, the back tension holder 30 of this example is formed in a substantially V shape. That is, the extension direction of each spring holding portion 32, 32 ′ is not the opposite direction with the angular interval of 180 ° but the downward direction, for example, 160
It is set to exist at an angle of °. Also, the slide elongated hole 31a formed in the shaft end portion support portion 31 is slightly curved, and the displacement direction of the shaft end portion of the deviation control roller 6 has a curved locus along the slide elongated hole 31a. It is set to draw. Also, this slide long hole 31
The shape of a is set so that the belt tension of the conveyor belt 2 does not change even if the shaft end of the deviation control roller 6 moves along the slide elongated hole 31a.

With this structure, since the belt tension of the conveyor belt 2 does not change during the deviation correcting operation, it is possible to prevent the change in tension from adversely affecting the deviation correcting operation. In addition, the back tension springs 34, 34 housed in the back tension holder 31.
Since the urging force from ′ acts toward the center of the shaft portion 6a of the deviation control roller 6, the amount of displacement of the shaft portion 6a can be adjusted satisfactorily. Although the case where the driving device is mounted on the belt conveyor 1 has been described, the present invention is not limited to this, and can be applied to various belt driving devices such as a transfer belt driving device of a copying machine and a belt driving device of a printer device. .

The means for converting the rotational movement of the deviation detection ring 40 into the displacement of the shaft portion 6a of the deviation control roller 6 is not limited to the detection belt 41 and the detection cord 50 as described above, but a rack and pinion. A mechanism may be adopted. That is, a gear (pinion) is formed on the outer peripheral surface of the boss portion 40c of the deviation detecting ring 40, and the deviation control roller 6
The shaft portion 6a is configured to be meshed with a rack arranged along the direction of displacement.

[0098]

As described above, according to the present invention,
The following effects are exhibited. According to the first aspect of the invention, the eccentric belt comes into contact with the eccentricity detecting member, and the rotational force generated by the eccentricity detecting member is converted into the moving force of the roller shaft end portion to eccentricize the belt. Of the plurality of rollers around which the flat belt is stretched, the at least one roller excluding the deviation adjusting roller has a shaft center with respect to the other rollers. Since the roller shaft center adjusting means for changing the tilt angle is provided, even if the amount of deviation of the eccentric flat belt becomes large, the roller shaft center adjusting means can reduce the amount of deviation, and the deviation can be corrected sufficiently. It will be possible to make an action. In other words, the flat belt is used when there is a processing error in each member that constitutes the belt drive device or when the friction coefficient between the belt and the deviation detection member changes due to the operating conditions of the device and changes over time. Even in a situation in which a large deviation occurs, the deviation amount can be reduced, an optimum running state can be obtained, and the practicality of the present device can be improved.

According to the second aspect of the invention, the shaft end of the roller supported by the bearing member is moved in the direction orthogonal to the roller axis, so that the effect of the first aspect is achieved. It is possible to specifically obtain a configuration for obtaining the above, and it is possible to surely perform a good deviation correcting operation.

According to the third aspect of the present invention, when the flat belt is running in the forward direction and when the flat belt is running in the opposite direction to the displacement direction of the shaft end of the deviation adjusting roller. Since the displacement direction varying means for setting the displacement direction of the shaft end portion of the deviation adjusting roller in the above direction to be opposite to each other is provided, even when the traveling direction of the flat belt is variable, it is always possible to obtain a good deviation. The dynamic correction operation is performed, which also improves the practicability of the present device.

According to the invention described in claims 4 to 6, a configuration for performing the deviation correction operation according to the traveling direction of the flat belt can be specifically obtained, and the practicality of the present apparatus can be improved. Further, in particular, according to the invention of claim 5, it is possible to reliably prevent the occurrence of slippage between the deviation detection member and the winding member,
The rotational movement of the deviation detecting member can be reliably converted into the displacement movement of the shaft end portion of the deviation adjusting roller, the deviation correcting operation can be favorably performed, and the reliability can be improved.

According to the invention described in claim 7, the displacement amount of the shaft end portion of the deviation adjusting roller is determined by the balance between the moving force of the shaft end portion of the deviation adjusting roller and the biasing force of the biasing means. The position of the end portion of the flat belt is regulated and can be maintained at a certain fixed position, and the traveling state of the flat belt can be obtained more stably.

[Brief description of drawings]

FIG. 1 is a sectional view in which a part of a belt conveyor according to a first embodiment is cut away.

FIG. 2 is a sectional view taken along a line II-II in FIG.

3 is a cross-sectional view at a position corresponding to a line III-III in FIG.

FIG. 4 is an exploded perspective view of a tension unit.

FIG. 5 is an exploded perspective view of the deviation adjusting mechanism and its peripheral portion.

FIG. 6 is a perspective view showing a supporting state of the deviation control roller by each support frame.

FIG. 7 is a view corresponding to FIG. 1 for explaining the shaft center position changing mechanism.

FIG. 8 is a schematic diagram of a belt conveyor used in an experiment.

FIG. 9 is a diagram showing a belt deviation state in an experiment.

FIG. 10 is a view corresponding to FIG. 1 in the second embodiment.

FIG. 11 is a view corresponding to FIG. 2 in the second embodiment.

FIG. 12 is a view corresponding to FIG. 3 in the second embodiment.

FIG. 13 is a view corresponding to FIG. 4 in the second embodiment.

FIG. 14 is a view corresponding to FIG. 5 in the second embodiment.

FIG. 15 is a view corresponding to FIG. 6 in the second embodiment.

FIG. 16 is a cross-sectional view showing the internal structure of the back tension holder.

FIG. 17 is a perspective view showing a shaft end portion of the deviation control roller.

FIG. 18 is a view corresponding to FIG. 17 in the first modified example.

FIG. 19 is a view corresponding to FIG. 16 in the second modification.

FIG. 20 is a diagram showing a back tension holder according to a third modified example.

[Explanation of symbols]

 1 Belt Conveyor 2 Conveyor Belt (Flat Belt) 3 Driving Roller 4 Head Roller 5 Tail Roller 6 Deflection Control Roller (Deflection Adjusting Roller) 7 Variable Roller 16 Shaft Center Position Adjusting Mechanism (Roller Center Adjusting Means) 22 1st Tension spring (deviation applying means) 25 Tension plate (fixing member) 27 Second tension spring (deviation applying means) 40 Deviation detection ring (deviation detection member) 45 Variable roller bearing member 46 Screw member (guide member) 48 Variable roller adjusting member 50 Detection string (winding member)

Claims (7)

[Claims] 1. A flat belt, a plurality of rollers around which the flat belt is stretched, at least one of which is a deviation adjusting roller, and one shaft end of the deviation adjusting roller, An eccentricity detection member rotatably supported independently of the eccentricity adjustment roller, an offset imparting means for moving the flat belt toward a position where the eccentricity detection member is disposed, and the eccentricity detection member. When the flat belt comes into contact with the deviation detecting member and a rotational torque acts on the deviation detecting member, the rotational movement of the flat belt is caused by the deviation imparting means. A roller end displacement means for converting the end portion into a movement displacing in a predetermined direction and moving the flat belt in a direction away from the deviation detecting member, and excluding the deviation adjusting roller among the plurality of rollers. For at least one roller, That another belt drive, characterized in that the roller axis adjusting means for freely changing the angle of inclination of the axis is provided for the roller. 2. The roller shaft center adjusting means is provided at both shaft end portions of the roller, and a bearing member that rotatably supports the shaft end portions, and the bearing member is orthogonal to the extension direction of the roller shaft center. A guide member for movably guiding in the direction of rotation, and an adjusting member for adjusting the position of the bearing member with respect to the guide member to adjust the axial center position of the roller and the inclination angle of the axial center. The belt drive device according to claim 1. 3. A flat belt, and the flat belt is stretched over in such a manner that the flat belt can run forward and backward.
A plurality of rollers, each of which is a deviation adjusting roller, and deviation detection which is rotatably supported by one shaft end of the deviation adjusting roller independently of the deviation adjusting roller. A member, an offset imparting means for moving the flat belt toward the position where the deviation detecting member is disposed, and a bias belt which is linked to the deviation detecting member and causes the flat belt to deviate. When the flat belt comes into contact with the deviation detection member and rotational torque is applied, the rotational movement is converted into movement in which the shaft end of the deviation adjusting roller is displaced in a predetermined direction, and the flat belt is detected as deviation. A roller end displacing means for moving the member in a direction away from the member, wherein the roller end displacing means is a direction of a rotational torque generated in the deviation detecting member when the deflecting flat belt comes into contact with the deviation detecting member. However, depending on the traveling direction of the flat belt, And the displacement direction of the shaft end portion of the deviation adjusting roller when the flat belt is running in the forward direction, and the shaft end portion of the deviation adjusting roller when the flat belt is running in the opposite direction. A belt drive device, comprising: displacement direction varying means for setting the displacement directions of the and the opposite directions to each other. 4. The one end of the deviation adjusting roller provided with the deviation detecting member is rotatably supported by a fixing member, and the displacement direction varying means is flexible and has a deviation. A winding member wound around the motion detecting member is provided, and the winding member is
Both ends are fixed to the fixing member at a position sandwiching the shaft end portion in the displacement direction of the shaft end portion of the deviation adjusting roller when the flat belt is moved in the direction away from the deviation detection member. The belt drive device according to claim 3, wherein the belt drive device is provided. 5. The belt driving device according to claim 4, wherein the winding member has a part of a portion wound around the deviation detecting member fixed to the deviation detecting member. 6. The deviation adjusting roller is rotatably supported by a fixing member at one end of the shaft on which the deviation detecting member is provided, and the displacement direction varying means has flexibility and a bias. The winding detecting member is provided with a pair of winding members wound around the movement detecting member. One end of each winding member moves when the flat belt moves in a direction away from the deviation detecting member. In the displacement direction of the shaft end portion of the adjusting roller, while being fixed to the fixing member at positions sandwiching the shaft end portion, the winding directions of the other end portion with respect to the deviation detection member are set to opposite directions, 4. The belt drive device according to claim 3, wherein the end portion is fixed to the deviation detecting member. 7. The displacement direction varying means applies an urging force in a direction substantially opposite to a displacement of a shaft end portion of the deviation adjusting roller when the flat belt is moved in a direction away from the deviation detecting member. An urging means is provided to apply to the end portion, and the urging means is provided in a pair with the shaft end portion sandwiched in the displacement direction of the shaft end portion of the deviation adjusting roller. The belt drive device according to Item 3, 4, 5 or 6.