JP2020097463A - Belt conveyor and weighing apparatus - Google Patents

Abstract

To provide a conveyor capable of stably carrying an article.SOLUTION: A belt conveyor 3, 3a has four driven rollers 8(1)-8(4), a belt 9, a drive roller 7 contacting a surface of the belt 9, and a pedestal 24 contacting slidable with an underside of the belt 9. The belt 9 has a friction coefficient lower at the underside than at the surface. Because the frictional force of the belt when placed in slidable contact with the pedestal is relatively small and the drive roller efficiently transmits a drive force by contacting the surface of the belt whose friction coefficient is relatively high, a high conveyance force is obtained to reduce the size of a driving source such as a motor. The article rested on the surface of the belt is supported by the pedestal and in contact with the surface of the belt having a high friction coefficient, so that it is less changed in position during conveyance and hence stable in position during conveyance. If the conveyor is used for a weighing apparatus, weighting accuracy becomes higher.SELECTED DRAWING: Figure 4

Description

TECHNICAL FIELD The present invention relates to a belt conveyor having a large carrying force and high stability of an article being carried, and a weighing device having a high weighing accuracy because a weight is measured while the article is carried by the belt conveyor.

The following Patent Document 1 discloses an invention of a conveyor having a large article conveying force and an invention of a weighing device using the conveyor. This conveyor is a belt conveyor in which a belt 12 is wound around a pair of rollers 11a and 11b. On the back surface 12b of the belt 12, a friction portion 14 having a predetermined width and continuous in the movement direction is formed at a substantially center. The friction portion 14 can be formed of, for example, urethane coating. The friction portion 14 can increase the friction between the rollers 11a and 11b and the belt 12 to enhance the transmission efficiency of the driving force, and give the belt 12 a high conveying force. The pedestal 10 that comes into contact with the belt 12 has the concave groove 21 formed at a position corresponding to the friction portion 14 on the upper surface 10a of the pedestal 10. Therefore, the friction portion 14 of the belt 12 does not come into contact with the pedestal 10 and the belt 10 It does not reduce the carrying force of No. 12. According to this conveyor and a weighing device using this conveyor, a large conveying force can be obtained with a simple structure in which a frictional portion is formed on the back surface of the belt and a groove is formed in the pedestal. The effect is that cleaning is easy.

JP, 11-334829, A

According to the invention of the conveyor disclosed in Patent Document 1, a friction portion is provided on the back surface of the belt in order to increase the frictional force between the driving roller and the belt to improve the conveying force. Since an increase in friction with the pedestal in sliding contact causes a reduction in conveyance force, a concave groove is provided on the surface of the pedestal to prevent the friction portion of the belt from contacting. When carrying an article on a conveyor having such a structure, when the article is placed at a position corresponding to the groove on the surface of the belt, there is a space for the groove below the belt on which the article is placed, The weight of is supported only by the belt made of elastic material. Therefore, when the article is conveyed by moving the belt along the pedestal, depending on the article, the posture may not be stable, and in some cases, the article may fall and fall out of the conveyor. Further, according to the weighing device using this conveyor, sufficient weighing accuracy cannot be obtained because the posture of the article being conveyed is unstable.

The present invention has been made in view of the problems in the conventional art described above, and since the transmission efficiency of the driving force to the belt is high, the article conveying force is large, and the article can be conveyed in a stable state. An object of the present invention is to provide a possible conveyor and a weighing device having a high weighing accuracy for weighing an article while being conveyed by the conveyor.

The belt conveyors 3, 3a, 3b, 3c, 3d described in claim 1,
The drive roller 7 includes at least three rollers 7 and 8 including a drive roller 7, a belt 9 wound around the rollers 7 and 8, and a pedestal 24 slidably contacting the back surface of the belt 9. Belt conveyors 3, 3a, 3b, 3c, 3d for carrying and placing articles on the surface of the belt 9 moving along the pedestal 24 by circulating and moving the belt 9,
The friction coefficient of the back surface of the belt 9 is lower than the friction coefficient of the front surface, and the drive roller 7 contacts the front surface of the belt 9 to transmit a driving force.

The belt conveyors 3, 3a, 3b, 3c, 3d described in claim 2 are the belt conveyors 3, 3a, 3b, 3c, 3d according to claim 1,
A drive unit 5 including the drive roller 7 and a motor for rotating the drive roller 7;
Conveyor units 6, 6a, 6b, 6c, 6d, which include the rollers 8 other than the driving rollers 7 and the belt 9 and are detachable from the driving unit 5,
It is characterized by having.

The belt conveyors 3, 3a, 3b, 3c, 3d described in claim 3 are the belt conveyors 3, 3a, 3b, 3c, 3d according to claim 2,
The drive unit 5 is characterized by having position adjusting mechanisms 17 and 18 for adjusting the position of the drive roller 7.

The weighing device 1 according to claim 4 is
An article is provided, comprising: the belt conveyors 3, 3a, 3b, 3c, 3d according to any one of claims 1 to 3; and a weighing section 2 on which the belt conveyors 3, 3a, 3b, 3c, 3d are mounted. It is characterized in that the measurement is carried out by the measuring section 2 while being conveyed by the belt conveyors 3, 3a, 3b, 3c, 3d.

According to the belt conveyor of the first aspect, the article placed on the surface of the belt can be conveyed by circulating and moving the belt by the drive roller. Since the friction coefficient of the back surface of the belt is lower than the friction coefficient of the front surface, even if the back surface of the belt is in sliding contact with the pedestal, the friction force generated is relatively small compared to the case where the friction coefficient is the same as the front surface. .. Further, since the drive roller contacts the surface of the belt having a relatively high coefficient of friction and transmits the drive force, not the back surface of the belt having a relatively low coefficient of friction, the drive force of the drive force transmitted from the drive roller to the belt is reduced. The transmission efficiency is higher than that when the friction coefficient is low. Therefore, according to this belt conveyor, if the power source is the same, a higher carrying force can be obtained than the conventional conveyor, so that the drive source such as the motor can be downsized and the equipment cost and the maintenance cost can be reduced as compared with the conventional one. .. When this belt conveyor is used as a conveyor for a weighing device, downsizing of the drive source leads to weight reduction of the conveyor and improvement of the eccentric center of gravity of the belt conveyor, and an effect of improving the responsiveness of the weighing device can be expected. Further, since the belt moves while contacting the pedestal, the weight of the article placed on the surface of the belt is supported by the pedestal. In addition, the conveyed article is not in contact with the back surface of the belt having a relatively low coefficient of friction but is in contact with the surface of the belt having a relatively high coefficient of friction. Hard to change. Therefore, the posture of the article being conveyed is stable.

According to the belt conveyor of claim 2, since the belt conveyor is composed of two units, that is, a drive unit having a drive roller and a motor, and a conveyor unit detachable from the drive unit, it is possible to separate the two units. If so, it is easy to clean the drive roller and belt. Also, when the drive unit and the conveyor unit are integrated, the relative position of the drive roller and the belt can be set arbitrarily so that the contact state of the drive roller with the belt can be changed to adjust the belt tension arbitrarily. can do.

According to the belt conveyor described in claim 3, after the drive unit and the conveyor unit are integrated, the position adjustment mechanism of the drive unit adjusts the position of the drive roller, so that the relative position of the drive roller and the belt can be arbitrarily set. Set to to adjust the levelness and belt tension.

According to the weighing device described in claim 4, the weight of the article can be weighed by the weighing section while the article placed on the surface of the belt is conveyed by circulating and moving the belt by the drive roller. it can. Since the friction coefficient of the back surface of the belt is lower than the friction coefficient of the front surface, even if the back surface of the belt is in sliding contact with the pedestal, the friction force generated is relatively small compared to the case where the friction coefficient is the same as the front surface. .. Further, since the drive roller contacts the surface of the belt having a relatively high coefficient of friction and transmits the drive force, not the back surface of the belt having a relatively low coefficient of friction, the drive force of the drive force transmitted from the drive roller to the belt is reduced. The transmission efficiency is higher than that when the friction coefficient is low. Therefore, according to this weighing device, since the conveyor belt has a high carrying force, the drive source such as the motor can be made smaller than the conventional one, and the equipment cost and the maintenance cost can be reduced. In addition, downsizing of the drive source leads to weight reduction of the conveyor and improvement of the eccentric center of gravity of the belt conveyor, and the effect of improving the responsiveness of the weighing device can be expected. Further, if the responsiveness of the weighing device is improved, it is possible to extend the weighing time in the same production situation. Further, since the belt moves while contacting the pedestal, the weight of the article placed on the surface of the belt is supported by the pedestal, so that the posture of the article during conveyance is stable, and therefore the article Weighing accuracy is improved than before.

It is a perspective view of a weighing device which is a 1st embodiment of the present invention. FIG. 2 is a perspective view showing a belt unit separated from a drive unit and a part of the drive unit seen through in the weighing device according to the first embodiment of the present invention. FIG. 3 is a perspective view showing a drive unit of the weighing device according to the first embodiment of the present invention with a part thereof seen through. Drawing (a) is a schematic diagram of a belt conveyor of a measuring device which is a 1st embodiment of the present invention, and Drawing (b) is a schematic diagram of a modification of a belt conveyor of a measuring device which is a 1st embodiment. FIG. 3 is an enlarged perspective view showing a state in which the belt is wrapped around the drive roller in the weighing device according to the first embodiment of the present invention. Drawing (a) is a schematic diagram of a belt conveyor of a measuring device which is a 2nd embodiment of the present invention, and Drawing (b) is a schematic diagram of a modification of a belt conveyor of a measuring device which is a 2nd embodiment. It is a schematic diagram of the belt conveyor of the weighing|measuring equipment which is 3rd Embodiment of this invention.

A weighing device according to a first embodiment of the present invention will be described with reference to FIGS.
As shown in FIG. 1, the weighing device 1 of the first embodiment includes a weighing unit 2 and a belt conveyor 3 attached to two dish-shaped weighing stands 4 of the weighing unit, and conveys articles to the belt conveyor. The articles can be weighed (measurement of weight) by the weighing unit 2 while being transported in the transport direction indicated by the arrow D by 3. The measuring principle and structure of the measuring unit 2 are not limited.

As shown in FIGS. 1 and 2, this belt conveyor 3 is composed of two units, a lower drive unit 5 and an upper conveyor unit 6. The drive unit 5 includes a drive roller 7 and is mounted on the weighing platform 4 of the weighing unit 2. The conveyor unit 6 includes a driven roller 8 other than the driving roller 7 and a belt 9, and is detachably attached to the driving unit 5. Although details will be described later, in this embodiment, the diameter of the driven roller 8 is set to be relatively smaller than the diameter of the driving roller 7 (see FIG. 4A).

As shown in FIGS. 1 to 3, the drive unit 5 includes a first frame 10 attached to the two weighing platforms 4 and 4 of the weighing unit 2. The first frame 10 has two rectangular tubular base bodies 11 and 11 and two side plates 12 and 12. The two rectangular tube-shaped bases 11 are orthogonal to the transport direction D in the transport surface, are arranged at a predetermined interval in the transport direction D, and are fixed to the two weighing platforms 4 and 4, respectively. .. The two side plates 12, 12 are joined to both ends of the two bases 11, 11. The outer shape of each side plate 12 is substantially trapezoidal, but the center thereof is cut out in a rectangular shape to form an opening 15. A rectangular cover 13 is detachably attached to the opening 15, and the inside of the first frame 10 can be accessed by removing the cover 13. The two side plates 12 and 12 are connected to the lower parts on the upstream side and the downstream side in the transport direction D by the bases 11 and 11, and also on the upper and lower sides of the edge parts on the upstream side and the downstream side of the opening 15. The places are connected by a total of four connecting rods 14.

As shown in FIGS. 2 and 3, an adjustment flange 16 that protrudes inward is provided below the opening 15 of the side plate 12 of the first frame 10. An adjusting screw 17 as a position adjusting mechanism for adjusting the position of the driving roller 7 is attached to the adjusting flange 16 in an upward direction. The adjusting screw 17 can be moved upward or downward by rotating it, and a housing 21 (see FIGS. 2 and 3) to be described later on which the drive roller 7 is mounted can be moved in the vertical direction.

As shown in FIGS. 1 to 3, between the pair of side plates 12 of the first frame 10, on the upstream side and the downstream side in the transport direction D, there is an adjusting plate 18 as a position adjusting mechanism of the drive roller 7. Each is provided. The adjusting plate 18 has a rectangular shape having a horizontal direction orthogonal to the transport direction D as a longitudinal direction, and is fixed to the side plate 12 with first fixing screws 20 at fixing flanges 19 provided at both ends thereof. Although not shown, since the screw hole provided in the fixing flange 19 is a long hole having the vertical direction as the longitudinal direction, the adjustment plate 18 can be moved in the vertical direction by loosening the first fixing screw 20. By tightening the first fixing screw 20 again, the vertical position of the adjusting plate 18 can be adjusted.

As shown in FIGS. 1 to 3, a box-shaped housing 21 is attached between the pair of adjusting plates 18, 18 of the first frame 10. A motor (not shown) is attached as a drive source inside the housing 21. The motor is fixed to the housing 21 in such a direction that its drive shaft is orthogonal to the transport direction D in the horizontal plane. The drive roller 7 is rotatably installed on the upper surface side of the housing 21. The axis of the drive roller 7 is parallel to the drive axis of the motor. The drive shaft of the motor projects outside the housing 21, and a drive belt 22 is wound around the shaft end of this drive shaft and the shaft end of the drive roller 7 (see FIG. 3). Although not shown in detail, the fixing position of the motor with respect to the housing 21 can be adjusted by removing the cover 13 and accessing the housing 21 in the first frame 10, and the distance between the motor and the driving roller 7 can be adjusted. The tension of the drive belt 22 can be adjusted by changing.

As shown in FIGS. 1 to 3, each adjusting plate 18 of the first frame 10 is formed with a plurality of elongated holes having a vertical direction as a longitudinal direction in a vertical and horizontal array. The housing 21 is fixed to the adjusting plate 18 by four second fixing screws 23 that pass through four of these elongated holes. Further, receiving plates 24 are provided so as to project from the lower edges of the front side and the rear side of the housing 21 parallel to the transport direction D. The receiving plate 24 is provided with a notch. The tip of the adjusting screw 17 provided on the side plate 12 of the first frame 10 is engaged with the notch of the receiving plate 24. By operating this adjusting screw 17, it is possible to apply an upward force or a downward force to the front side and the back side of the housing 21, respectively.

With the adjusting plate 18 fixed to the side plate 12 with the first fixing screw 20, the second fixing screw 23 is loosened, the cover 13 is removed, and the adjusting screw 17 is operated. By this, the posture of the housing 21 with respect to the adjusting plate 18 is changed, and the second fixing screw 23 is tightened again to arbitrarily adjust the position (height and inclined state) of the drive roller 7 mounted on the housing 21. You can Further, with the housing 21 fixed to the adjusting plate 18 with the second fixing screw 23, the first fixing screw 20 is loosened and the adjusting screw 17 is operated. With this, by changing the vertical position of the housing 21 and tightening the first fixing screw 20 again, the height of the drive roller 7 mounted on the housing 21 can be arbitrarily set. Therefore, as shown in FIG. 4A, it is possible to adjust the contact state of the drive roller 7 whose position has been adjusted with respect to the conveyor belt 9 and adjust the tension of the conveyor belt 9.

As shown in FIGS. 1, 2 and 4(a), the conveyor unit 6 includes a second frame 25 (see FIGS. 1 and 2) and first to fourth 4 mounted on the second frame 25. The four driven rollers 8(1), 8(2), 8(3), 8(4) (see FIG. 4(a)) and four driven rollers 8(1) to (4) are looped around each other. It has a rotated endless belt 9 and a rigid pedestal 26 (see FIG. 4A) that is in sliding contact with the back surface of the belt 9 on the upper side of the annular belt 9. Since the upper surface of the pedestal 26 is in a flat state without any processing such as grooves and is in contact with substantially the entire lower surface of the belt 9 between the driven rollers 8(1) and 8(2), this belt An article placed on the upper surface of 9 can be stably supported. The friction coefficient of the back surface of the belt 9 that contacts the pedestal 26 is lower than the friction coefficient of the surface that contacts the drive roller 7. There is no limitation on means for making the friction coefficient of the front surface and the back surface different, and, for example, the material of the belt 9 may be changed between the front and the back, mechanical processing applied to the belt 9, application of a surface treatment material, etc. The surface treatment method may be changed between the front and back.

As shown in FIG. 2 and FIG. 3, a total of four flange-shaped fixing portions 27 are provided at each of the upper end edges of the two side plates 12 of the drive unit 5 at two locations on the upstream side and the downstream side. .. As shown in FIGS. 2 and 1, the conveyor unit 6 is placed on the fixing portion 27 so as to overlap the driving unit 5 from above, and the second frame 25 of the conveyor unit 6 and the driving unit 5 are fixed by fixing means such as screws. If the first frame 10 is fixed, a belt conveyor can be constructed.

As shown in FIGS. 4(a) and 5, in the assembled belt conveyor, the drive roller 7 includes the third and fourth driven rollers 8(3) arranged below the conveyor unit 6. , 8(4) to come into contact with the surface of the belt 9 (the surface on which the conveyed article has a large friction coefficient), and the third and fourth driven rollers 8(3), 8(4) Then, the belt 9 is pushed upward. In the example shown in FIG. 5, the winding angle of the belt 9 with respect to the drive roller 7 is 180 degrees or more, and the contact area between the drive roller 7 and the belt 9 has a sufficient area for transmitting the driving force. Further, the driving roller 7 is not in contact with the back surface of the belt 9 having a relatively low friction coefficient, but is in contact with the surface of the belt 9 having a relatively high friction coefficient to transmit the driving force. Therefore, in this embodiment, the transmission efficiency of the driving force transmitted from the driving roller 7 to the belt 9 is improved as compared with the conventional case. The contact state between the driving roller 7 and the belt 9 can be adjusted by operating the adjusting screw 17 with the first fixing screw 20 loosened as described above.

Further, in the present embodiment, the coefficient of friction of the back surface of the belt 9 is lower than the coefficient of friction of the surface thereof, so that the frictional force when the back surface of the belt 9 makes sliding contact with the pedestal 26 as shown in FIG. 4A. In comparison with the case where a material having a coefficient of friction such as the surface of the belt 9 is in sliding contact, it can be relatively small.

As described above, according to this belt conveyor, the driving roller 7 is in contact with the surface of the belt 9 having a large friction coefficient over a wide area, and the friction between the belt 9 and the pedestal 26 is small. The motor can be downsized and the equipment cost and maintenance cost can be reduced.

Further, in the present embodiment, as shown in FIG. 4A, the belt 9 moves while contacting the pedestal 26, so that the weight of the article placed on the surface of the belt 9 is stable on the pedestal 26. Supported. In addition, since the article to be conveyed is placed on the surface of the belt 9 having a relatively high coefficient of friction, not on the back surface of the belt 9 having a relatively low coefficient of friction, during transportation such as slipping, rolling, or falling. Change of posture is unlikely to occur. Therefore, the belt conveyor has the effect of stabilizing the posture of the article being conveyed, and the weighing device 1 has the effect of stabilizing the article during the conveyance and thus improving the accuracy of weighing the article as compared with the conventional case.

Further, in the present embodiment, if the conveyor unit 6 is separated from the drive unit 5, the drive roller 7, the belt 9 and the like can be easily cleaned.

Although the first embodiment described above is the weighing device 1 in which the belt conveyor is mounted on the weighing unit 2, only the portion of the belt conveyor may be used as the transport device.

A modified example of the belt conveyor used in the weighing device 1 of the first embodiment will be described with reference to FIG.
The belt conveyor 3a of the modified example shown in FIG. 4B is an example in which the number of rollers including the driving roller 7 is five, like the belt conveyor 3 shown in FIG. 4A, but the driven roller 8( The arrangements of 1) to 8(4) and the driving roller 7 are different. The diameters of the driven rollers 8(1) to 8(4) and the driving roller 7 are the same as those in the first embodiment. In this modified example, the height of the conveyor unit 6a, that is, the vertical interval between the horizontal portions of the belt 9 is larger than that of the conveyor unit 6 shown in FIG. 4A, and the drive roller 7 has a different vertical position. Between the driven roller 8(2) and the third driven roller 8(3) laterally in contact with the surface of the belt 9. Therefore, the driving roller 7 in the upper part of the housing 21 of the driving unit 5 is arranged so that the driving roller 7 can enter from the side of the conveyor unit 6 a and a part of the conveyor unit 6 a can be located below the driving roller 7. It is assumed that the arrangement and structure of 7 are appropriately modified to modify the structure of the drive unit 5 from the first embodiment. Also with this modification, the same effect as that of the first embodiment can be obtained.

A belt conveyor used in the weighing device according to the second embodiment will be described with reference to FIG. The second embodiment shown in FIG. 6 is an example in which the number of rollers of the belt conveyor is four, including the driving roller 7, and is different from the first example in which the arrangement of the rollers is different in the partial diagrams (a) and (b). A second example is shown. The diameters of the driven roller 8 and the driving roller 7 are the same as those in the first embodiment.

The conveyor unit 6 of the first example shown in FIG. 6A has two first and second driven rollers 8(1), 8(2) arranged near both ends of the receiving table 26, and a second It has a third driven roller 8(3) arranged close to the driven roller 8(2). The drive roller 7 is laterally inserted between the second driven roller 8(2) and the third driven roller 8(3) and is in contact with the surface of the belt 9. Therefore, the drive roller 7 can enter from the side of the conveyor unit 6b, and a part of the conveyor unit 6b (the third driven roller 8(3)) can be positioned below the drive roller 7, The arrangement of the drive roller 7 in the upper part of the housing 21 of the drive unit 5 is appropriately modified, and the structure of the drive unit 5 is modified from the first embodiment. According to the first example, the same effect as that of the first embodiment can be obtained.

The conveyor unit 6c of the second example shown in FIG. 6(b) includes first and second driven rollers 8(1), 8(2) arranged near both ends of the pedestal 26, and a first It has a third driven roller 8(3) arranged close to the driven roller 8(1). The driving roller 7 laterally enters between the second driven roller 8(2) and the third driven roller 8(3), which are relatively distant from each other, and comes into contact with the surface of the belt 9, so that the third driven roller 8(3) is driven. It is arranged near the roller 8(3). The belt 9 between the second driven roller 8(2) and the driving roller 7 is a belt that is in contact with the pedestal 26 between the first driven roller 8(1) and the second driven roller 8(2). It is almost parallel to 9. According to the second example, the wrap angle of the belt 9 with respect to the drive roller 7 is slightly shorter than that in the first embodiment, but as shown in FIG. 6B, a region having no structural parts is provided on the right side of the drive roller 7. It can be provided, and while the effect close to that of the first embodiment is secured, the degree of freedom in design is increased accordingly.

A belt conveyor used in the weighing device 1 of the third embodiment will be described with reference to FIG. 7. The third embodiment is an example in which the number of rollers of the belt conveyor is three, including the driving roller 7. The conveyor unit 6d of the third embodiment has first and second driven rollers 8(1) and 8(2) arranged near both ends of the receiving table 26. The drive roller 7 comes in between the first driven roller 8(1) and the second driven roller 8(2) and is in contact with the surface of the belt 9. The driven rollers 8(1), 8(2) have the same diameter as the driving roller 7. According to the third embodiment, the wrap angle of the belt 9 with respect to the drive roller 7 is further shorter than that of the second example of the second embodiment, but the effect close to that of the second embodiment is ensured with a compact configuration having a small number of rollers. There is an effect that you can.

In each of the embodiments described above, the belt conveyor is composed of two separable units, the driven roller 8, the conveyor unit 6 in which the belt 9 is wound around the pedestal 26, and the drive roller 7 and the drive unit 5 having a motor. However, it is not always necessary to have such a configuration. At least three rollers including a driving roller, a belt wound around these rollers, and a pedestal that slidably contacts the back surface of the belt, and the friction coefficient of the back surface of the belt is lower than the friction coefficient of the front surface. As long as the roller contacts the surface of the belt and transmits the driving force, the basic effects of the above-described embodiments can be obtained.

1... Measuring device 2... Measuring unit 3, 3a, 3b, 3c, 3d... Belt conveyor 5... Driving unit 6, 6a, 6b, 6c, 6d... Conveyor unit 7... Driving roller 8, 8(1), 8(2 ), 8(3), 8(4)... driven roller 9... belt 17... adjusting screw as position adjusting mechanism 18... adjusting plate 24 as position adjusting mechanism 24... receiving plate D... conveying direction by belt conveyor

Claims (4)

At least three rollers (7, 8) including a driving roller (7), a belt (9) wound around the rollers, and a pedestal (24) slidably contacting the back surface of the belt, A belt conveyor (3, 3a, 3b, 3c, 3d) for carrying and placing articles on the surface of the belt that moves along the pedestal by circulating and moving the belt by a drive roller,
A belt conveyor (3, 3a, 3b, 3a, 3b, 3b 3c, 3d). A drive unit (5) comprising the drive roller (7) and a motor for rotating the drive roller;
A conveyor unit (6, 6a, 6b, 6c, 6d) that includes the roller (8) other than the drive roller and the belt (9) and is detachable from the drive unit;
The belt conveyor (3, 3a, 3b, 3c, 3d) according to claim 1, characterized by comprising: The belt conveyor (3, 3a, 3b, 3c, 3) according to claim 2, wherein the drive unit (5) has a position adjusting mechanism (17, 18) for adjusting the position of the drive roller (7). 3d). A belt conveyor (3, 3a, 3b, 3c, 3d) according to any one of claims 1 to 3, and a weighing unit (2) for mounting the belt conveyor, wherein articles are conveyed by the belt conveyor. While, the weighing device (1) is characterized in that weighing is performed by the weighing unit.