JP2002013971A - Weighing conveyor and weighing device provided with this - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a weighing conveyor capable of speeding up weighing by bringing a centroid of a conveyor device being a tare to near a moment center of a load detector without increasing a tare weight to reduce moment acting on the load detector. SOLUTION: A conveying mechanism 5 is positioned above a load cell 4 and a driving motor 6 is positioned in a position substantially the same as the load cell 4 in a vertical direction. A power transmission mechanism 7 is extended from a position lower than the load cell 4 toward the above conveying mechanism 5. Since the power transmission mechanism 7 is extended lower than the load cell 4, the centroid R of the conveyor device 3 having the conveying mechanism 5, the driving motor 6, and the power transmission mechanism 7 becomes lower and nearer to the moment center S of the load cell 4. In such a case, the conveying mechanism 5 is not enlarged and the conveyor device 3 does not become excessively heavier.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention belongs to the technical field of a weighing conveyor for weighing an object to be weighed while being conveyed, and a weighing apparatus provided with the weighing conveyor.

[0002]

2. Description of the Related Art There is known a weighing device for weighing an object to be weighed while transporting the object on a production line or the like. Examples of such a weighing device include a weight checker and an automatic weight sorting device. The weight checker determines whether or not the weight of the object to be weighed is within a predetermined allowable range with respect to a predetermined target weight. The automatic weight sorting apparatus ranks objects to be weighed by weight in order to make a price according to the weight of the objects to be weighed, for example.

[0003] Such a weighing device is provided with a weighing conveyor. The weighing conveyor has a transport mechanism for transporting the object to be weighed, a drive source for driving the transport mechanism, and a power transmission mechanism for transmitting the driving force of the drive source to the transport mechanism.
A load detector that supports these and detects the weight of the object to be weighed being conveyed by the conveyance mechanism.

FIG. 13 shows a schematic configuration of a typical conventional metering conveyor a. A transport flat belt d is wound around a pair of the driving roller b and the driven roller c, and a transport mechanism e that transports the object x in the arrow y direction is configured. The rollers b and c are provided on a conveyor frame f, and the frame f is connected via a support frame g to a free end of a strain generating body of a load cell h as a load detector. The fixed end of the strain body of the load cell h is connected to a fixed support j mounted on the floor i.

[0005] A motor k as a drive source is attached to the support frame g. A thin belt o is wound around a pulley m attached to the rotating shaft of the motor k and a pulley n coaxial with the driving roller b, and the driving force of the motor k is transferred via the power transmission belt o to the transport mechanism e. A power transmission mechanism p for transmitting power to the vehicle. The load cell h includes these transport mechanism e, drive motor k, and power transmission mechanism p.
(Hereinafter, these e, k, and p are collectively referred to as “conveyor device q” as appropriate). The load cell h detects the weight of the object x conveyed by the conveyance mechanism e, using the weight of the conveyor device q as the tare weight.

The weighing conveyor a shown in the figure is of a belt conveyor type, but is not limited to this. For example, a number of rollers are arranged side by side, and the weighing objects are conveyed by rotating these rollers. A roller conveyor type may be used. In addition, the weighing conveyor a in the illustrated example is an article mounting type in which the object x is mounted on a horizontal conveying surface and conveyed, but is not limited thereto, for example, between opposed vertical conveying surfaces. An article-carrying type in which an object x to be weighed is sandwiched and conveyed.

In the weighing conveyer a, for example, the transport mechanism e, the drive motor k, and the power transmission mechanism p are all disposed above the load cell h in the vertical direction. Further, a drive motor k is disposed near the drive roller b, and a power transmission mechanism p connecting the drive motor k and the drive roller b is disposed downstream of the load cell h in the transport direction of the object x. ing. Further, the load cell h itself is disposed upstream of the transport mechanism e in the transport direction.

Therefore, the transport mechanism e, the drive motor k,
And the combined center of gravity of the power transmission mechanism p, that is, the conveyor device q
Is moved away from the center of moment S of the load cell h both vertically and in the transport direction,
The distance L between both centers is long. The moment center refers to a position where the moment force is not detected even if the moment acts from any direction. In the load cell, the moment center is located, for example, at a position equidistant from a plurality of notches (thin portions) formed in the strain body.

As a result, assuming that the weight (tare weight) of the conveyor device q is Wq, for example, when the object x is transferred onto the conveyor device q or when the object x is moved on the conveyor device q, When the conveyor device q vibrates as indicated by arrows z and z due to vibration from the outside or the like, a moment force having a magnitude proportional to the tare weight Wq and the center distance L acts on the load cell h, Load cell h
Of the conveyor device q is added to the output signal of.

In this case, since the center distance L is long, the moment force is large. Therefore,
The influence of the noise increases during weighing. Further, since the center distance L is also long, the frequency of the noise component becomes low, and the cutoff frequency of, for example, a low-pass filter for removing the noise component must be lowered. However, when the cutoff frequency is reduced, the response of the filter is reduced, and the filter processing time is increased.
This has unfavorable consequences for speeding up weighing.

Therefore, a weighing conveyor as shown in FIG. 14 is disclosed in Japanese Patent Application Laid-Open No. 8-285662.
Components that are the same as or correspond to those in FIG. 13 will be described using the same reference numerals.

In the weighing conveyor a, the load cell h and the drive motor k are accommodated in a housing t so as not to be affected by an external environment such as moisture and dust. The housing t is arranged between the upper and lower running surfaces of the transport belt d.
The motor k is mounted on the housing t, and the free end of the strain body of the load cell h is connected to the housing t. Drive roller b
The driven rollers c are provided on conveyor frames f, f projecting from the housing t.

In the weighing conveyor a, the transport mechanism e, the drive motor k, and the power transmission mechanism p are all arranged at substantially the same position as the load cell h in the vertical direction. Further, the drive motor k and the load cell h are arranged to be concentrated substantially at the center of the transport mechanism e in the transport direction of the object x to be weighed. Accordingly, the center of gravity R of the conveyor device q approaches the center of moment S of the load cell h both in the vertical direction and in the transport direction, and the distance L between the centers is reduced.

As a result, the frequency of the noise component generated due to the vibration of the conveyor device q increases, the cutoff frequency of the low-pass filter can be increased, the responsiveness of the filter improves, and the filter processing time increases. Shorter, faster weighing is achieved.

[0015]

However, FIG.
In the weighing conveyor a shown in (1), the load cell h, the drive motor k, or the power transmission mechanism p are all disposed between the upper and lower running surfaces of the conveyor belt d, and the dimensions of the conveyor mechanism e are enlarged in the vertical direction. . Therefore, the weight of the transport mechanism e, and thus the weight of the conveyor device q, that is, the tare weight Wq, is large. Therefore, weighing conveyor a
For example, a low-pass filter having a high cutoff frequency cannot be used. Therefore, the responsiveness of the filter does not improve so much, and the filter processing time does not shorten so much, which hinders an increase in the measurement speed.

Further, the diameter of the rollers b and c has been increased with the vertical enlargement of the transport mechanism e. Therefore, the distance between the conveying surface of the weighing conveyor a and the conveying surface of an article supply device such as a bag-making and packaging device installed on the upstream side (not shown), and the vibration of the vibration sensor installed on the downstream side (not shown). The distance from the conveying surface of an article processing device such as a dispensing device is widened, and it becomes difficult to smoothly transfer and convey the object x having a short length or the object x having a small size. Then, as disclosed in the above-mentioned publication, when four rollers for winding the conveyor belt d are arranged vertically and front and rear (in the conveyance direction) in order to avoid the problem, the number of parts increases, and the number of parts increases. Weight of the transport mechanism e,
As a result, the weight (tare weight) Wq of the conveyor device q increases.

The present invention addresses the above-mentioned problems in a weighing conveyor and a weighing device for weighing while transporting an object to be weighed, and the weight of the conveyor device (tare weight).
Without increasing Wq, the center of gravity R of the conveyor device is brought closer to the center of moment S of the load detector, thereby shortening the distance L between the centers, thereby increasing the frequency band of the noise component to be removed. It is an object of the present invention to shorten the time and speed up the measurement. Hereinafter, the present invention including other problems will be described in detail.

[0018]

Means for Solving the Problems In order to solve the above problems, the invention described in claim 1 of the present application (hereinafter referred to as "first invention") is performed while conveying an object to be weighed. A weighing conveyor that weighs the weight, a transport mechanism that transports the object to be weighed, a drive source that drives the transport mechanism, a power transmission mechanism that transmits the driving force of the drive source to the transport mechanism, A load detector that detects the weight of the object to be weighed that is supported and transported by the transport mechanism, the transport mechanism is disposed above the load detector, and the drive source is located at approximately the same position as the load detector in the vertical direction or By disposing the power transmission mechanism at a position below the load detector and extending between the lower position and the upper position across the load detector, the transfer mechanism, the drive source, and the power transmission mechanism are provided. And the vertical center of gravity Characterized in that in proximity to the moment the center of the heavy detector.

The invention according to claim 2 (hereinafter referred to as “second
An invention is also a weighing conveyor that measures the weight of an object to be weighed while being conveyed, a conveyance mechanism that conveys the object to be weighed, a drive source that drives the conveyance mechanism, A power transmission mechanism for transmitting the driving force to the transport mechanism;
A load detector that supports these and detects the weight of the object to be weighed being conveyed by the conveyance mechanism, the conveyance mechanism is disposed below the load detector, and the drive source is substantially the same as the load detector in the vertical direction Position, and the power transmission mechanism is arranged so as to extend between the upper position and the lower position across the load detector, so that the combined center of gravity of the transport mechanism, the drive source, and the power transmission mechanism is vertically moved. Is characterized by being brought close to the moment center of the load detector.

Further, the invention according to claim 3 (hereinafter referred to as “third
An invention is also a weighing conveyor that measures the weight of an object to be weighed while being conveyed, a conveyance mechanism that conveys the object to be weighed, a drive source that drives the conveyance mechanism, A power transmission mechanism for transmitting the driving force to the transport mechanism;
A load detector that supports these and detects the weight of the object to be weighed being conveyed by the conveyance mechanism, and the load detector is disposed substantially at the center of the conveyance mechanism in the conveyance direction of the object to be weighed, and By disposing the power transmission mechanism near the detector and extending between the downstream and upstream positions in the transport direction with the load detector interposed therebetween, the power transmission mechanism The combined center of gravity with the mechanism is brought close to the moment center of the load detector in the transport direction.

Further, the invention according to claim 4 (hereinafter referred to as “fourth
An invention is also a weighing conveyor that measures the weight of an object to be weighed while being conveyed, a conveyance mechanism that conveys the object to be weighed, a drive source that drives the conveyance mechanism, A power transmission mechanism for transmitting the driving force to the transport mechanism;
A load detector that supports these and detects the weight of the object to be weighed being conveyed by the conveyance mechanism, and the load detector is disposed substantially at the center of the conveyance mechanism in the conveyance width direction of the object to be weighed, and the driving source is Placed at substantially the same position as the load detector in the transport width direction, so that the power transmission mechanism extends between substantially the same position as the load detector and the left or right position in the transport width direction in the transport width direction, or By arranging the load detector so as to extend between the position on the left side and the position on the right side in the conveyance width direction, the combined center of gravity of the conveyance mechanism, the driving source, and the power transmission mechanism is defined by the load detector in the conveyance width direction. It is characterized by being close to the moment center.

On the other hand, the invention according to claim 5 (hereinafter referred to as “fifth
In the first invention or the second invention, the load detector is disposed substantially at the center of the transport mechanism in the transport direction of the object to be weighed, the driving source is disposed close to the load detector, and By arranging the transmission mechanism so as to extend between the position on the downstream side and the position on the upstream side in the conveyance direction with the load detector interposed therebetween, the combined center of gravity of the conveyance mechanism, the drive source, and the power transmission mechanism can also be arranged in the conveyance direction. It is characterized in that it is brought close to the moment center of the load detector.

Further, the invention according to claim 6 (hereinafter referred to as a "sixth invention") is the invention according to the first invention, the second invention, the third invention or the fifth invention, wherein the load detector is provided for conveying the object to be weighed. Approximately at the center of the transport mechanism in the width direction, the drive source is located at approximately the same position as the load detector in the transport width direction, and the power transmission mechanism is located at approximately the same position as the load detector in the transport width direction and to the left in the transport width direction. , Or between the position on the right and the position on the right side, or between the position on the left and the right in the conveying width direction with the load detector interposed, so that the conveying mechanism, the driving source, and the power The combined center of gravity with the transmission mechanism is brought close to the moment center of the load detector also in the conveyance width direction.

A seventh aspect of the present invention (hereinafter referred to as a "seventh invention") relates to a weighing device comprising the weighing conveyor according to any one of the first to sixth inventions.

In any of the first to seventh inventions, the arrangement of the transfer mechanism, the drive source, and the power transmission mechanism with respect to the load detector is considered comprehensively, and as a result of the weight being balanced, the conveyor The center of gravity R of the device is close to the moment center S of the load detector. In that case, FIG.
4, the load detector h, the driving source k, or the power transmission mechanism p in order to bring the center of gravity R of the conveyor device q closer to the moment center S of the load detector h, like the weighing conveyor a shown in FIG.
Is not arranged in the transport mechanism e, the weight of the transport mechanism and thus the weight of the conveyor device (tare weight) W
q does not increase.

Therefore, the tare weight Wq and the center distance L
Can be reduced, and the moment force acting on the load detector decreases. As a result, the frequency band of the noise component to be removed is increased, the filter processing time can be shortened, and the measurement speed can be increased.

In particular, in the first invention, a power transmission mechanism is provided between a transport mechanism disposed above the load detector and a drive source disposed at substantially the same height as or lower than the load detector. By disposing the power transmission mechanism so as to extend vertically across the load detector, the weight balance in the vertical direction of the conveyor device is adjusted, and the center of gravity R of the conveyor device is aligned in the vertical direction. In the vicinity of the moment center S.

According to the second aspect of the present invention, when the power transmission mechanism is disposed between the transport mechanism disposed below the load detector and the drive source disposed at substantially the same height as the load detector,
By disposing the power transmission mechanism so as to extend vertically across the load detector, the weight balance in the vertical direction of the conveyor device is adjusted, and the center of gravity R of the conveyor device is positioned close to the moment center S of the load detector in the vertical direction. Let me.

According to the third aspect of the present invention, a power transmission mechanism is provided between a transport mechanism disposed so as to maintain a weight balance in the transport direction with respect to the load detector and a drive source disposed adjacent to the load detector. By arranging the power transmission mechanism so as to extend in the transport direction with the load detector interposed therebetween, the weight balance in the transport direction of the conveyor device is adjusted, and the center of gravity R of the conveyor device is detected in the transport direction. Close to the moment center S of the vessel.

According to the fourth aspect of the present invention, the transport mechanism is arranged so as to maintain the weight balance in the transport width direction with respect to the load detector, and the drive source is disposed at substantially the same position in the transport width direction as the load detector. In the meantime, when arranging the power transmission mechanism, by arranging the power transmission mechanism so as to extend between a position in the conveyance width direction substantially the same as the load detector and a position on the left or right side thereof, or By disposing the power transmission mechanism so as to extend in the transport width direction with the load detector interposed therebetween, the weight balance in the transport width direction of the conveyor device is adjusted, and the center of gravity R of the conveyor device is set to the moment of the load detector in the transport width direction. It is close to the center S.

On the other hand, in the fifth invention, by realizing the arrangement according to the first invention or the arrangement according to the second invention and the arrangement according to the third invention together, the center of gravity R of the conveyor device can be shifted in the vertical direction and the transport direction. The two-dimensionally approach the moment center S of the load detector in both directions.

Further, in the sixth invention, by realizing the arrangement according to the first invention or the arrangement according to the second invention together with the arrangement according to the fourth invention, the center of gravity R of the conveyor device can be adjusted in the vertical direction and the conveying width. In both directions, it is two-dimensionally close to the moment center S of the load detector. Further, by realizing the arrangement according to the third invention and the arrangement according to the fourth invention together, the center of gravity R of the conveyor device is two-dimensionally moved in both the conveying direction and the conveying width direction. S. In addition, by realizing the arrangement according to the first invention or the arrangement according to the second invention, the arrangement according to the third invention, and the arrangement according to the fourth invention together, the center of gravity R of the conveyor device can be adjusted in the vertical direction and the transport direction. It is three-dimensionally close to the moment center S of the load detector in the conveyance width direction.

According to the seventh aspect, the same operation and effect as those of the first to sixth aspects can be obtained in a weighing device such as a weight checker or an automatic weight selection device. Hereinafter, the present invention will be described in further detail through embodiments of the present invention, including other problems, based on the drawings.

[0034]

FIG. 1 is a schematic perspective view of a weighing device 1 according to an embodiment of the present invention, and FIG. 17 is indicated by an imaginary line (two-dot chain line), and the housing 8, the part of the support frame 9, and the leg members 10, 11 and the like to be seen below are omitted, and FIG. 1 is a right side view of a partial cutout at the top of FIG.
FIG. 4 is a left side view of the upper part of the weighing device 1, and shows the structure inside the housing 8. One of the housing 8, the leg member 10, and the support frame 9 is shown in FIG. FIG. 5 is a vertical cross-sectional view of the upper portion of the weighing device 1, in which a top plate member 21.
A view of the downstream side in the transport direction A from the immediately upstream side of 3, 25. In the case 8, the structure inside the case 8 is shown.
In the case where the housing 8 is broken and the support frame 9 is
A part of the support frame 9 is cut away to show the structure of the power transmission mechanism 7 accommodated in the support frame 9, and FIG. 6 shows the vicinity of the support portion of the driven roller 15 of the transport mechanism 5 of the weighing device 1. FIG. 9 is an enlarged right side view showing the outermost vertical wall 25.
b and 55b are removed, and FIG.
FIG. 8 is an enlarged cross-sectional view showing an engaged state between the roller 13 and the driven roller 13 or the driven roller 15 when viewed from the front side of the roller 13 or 15 to the end side or the start end side, and FIG. 9 is an enlarged view of the inner surface of the upper end of the right downstream arm 97 a of FIG. 9, which is a rectangular shape formed at the output end of the power transmission mechanism 7 for transmitting a driving force from the power transmission mechanism 7 to the drive roller 13. Of the hole 109b.

In this embodiment, the present invention is applied to the weighing device 1 shown in FIG. This weighing device 1
Is, for example, a weight checker or an automatic weight sorter.
The weighing device 1 is disposed, for example, in the middle of a production line, and a product, that is, an object X to be weighed, is supplied from an article supply device such as a bag making and packaging device (not shown) or an unloading device installed on the upstream side.
Is supplied. The weighing device 1 measures the weight of the weighing object X while transporting the weighing object X in the direction of the arrow A, and transfers the weighing object X to a sorting device (not shown) installed on the downstream side or another article processing device.

The weighing device 1 has a weighing conveyor 2. Alternatively, if necessary, a take-in conveyor for taking in the weighing object X supplied from the upstream device may be provided. The weighing conveyor 2 has a conveyor device 3 and a load cell 4. Further, the conveyor device 3 includes a transport mechanism 5, a drive motor 6, and a power transmission mechanism 7.

The weighing device 1 is of a belt conveyor type, and is of an article placing type for placing and transporting an object X to be weighed on a horizontal transport surface. The weighing device 1 has a housing 8 that houses the load cell 4 and the drive motor 6. The housing 8 is fixed to a pair of front and rear leg members 10 and 11. Further, the weighing device 1 has a support frame 9 for connecting the transport mechanism 5 to the free end 4c of the load cell 4.

As shown in FIG. 2, the transport mechanism 5 has a configuration in which an endless flat belt 17 as a transport belt is wound between a pair of front and rear rollers 13 and 15. The transport mechanism 5 is arranged above the housing 8. Particularly, it is arranged above the load cell 4 housed in the housing 8.

In the transport mechanism 5, a downstream roller (front roller) 13 in the transport direction A is a driving roller, and an upstream roller (rear roller) 15 is a driven roller. A top plate member 21... 21, 23, 25 divided into five is disposed between the rollers 13 and 15.

Each of the top plate members 21, 21, 23, 25 is elongated in the front-back direction and is arranged in parallel at a predetermined interval. The three inner top plate members 21 are located immediately below the upper traveling surface, which is the transport surface of the transport belt 17, and support the transport surface from behind. On the other hand, a top plate member 23 on the left side in the transport direction A (this side is referred to as a left side in this embodiment) and a top panel member on the right side in the transport direction A (this side is also referred to as a right side). The member 25 is located near the ends of the rollers 13 and 15 and partially supports the left and right side edges of the transport surface of the transport belt 17 from behind.

Here, the width of the conveyor belt 17 is slightly longer than the length of the rollers 13 and 15, and reference numeral 1 in FIGS.
As shown by 7a, the rear surfaces of the left and right side edges of the transport belt 17 protrude backward. And the projecting edge 17
a, 17a are engaged with the ends of the rollers 13, 15.
As a result, the transport belt 17 is always and correctly wound around the rollers 13 and 15 stably without winding around the rollers 13 and 15 and meandering in the width direction.

On the upper surfaces of the outer top plate members 23, 25, the projecting edges 17a, 17a of the transport belt 17 are provided.
Steps 23a and 25a are formed to avoid this.

As shown in FIG. 5, the top plate members 21.
Each of 23 and 25 is formed by bending a substantially U-shaped vertical section. Then, as shown in FIG.
1, ..., 23, 25 are three Ls extending in the transport width direction.
They are connected by mold beams 31, 33, 35. As shown in FIGS. 3 to 5, left and right side top plate members 23 and 25 are provided.
The outer vertical walls 23b and 25b extend vertically upward and left and right side walls of the transport mechanism 5.

As shown in FIG. 2, the driving roller 1 on the downstream side
3 are shafts 13a, 13b protruding from both ends thereof.
And rotate together. Bearing units 37 and 39 are attached to the vertical wall of the L-shaped beam 31 on the most downstream side, and the shafts 13a and 13b are rotatably supported by the bearing units 37 and 39.

One shaft (left shaft in the illustrated example) 13a is accommodated in a corresponding bearing unit (same as the left bearing unit) 37. An engagement member 41 protrudes from the outer surface of the bearing unit 37. On the other hand, the other shaft (the right shaft in the illustrated example) 1
3b penetrates the corresponding bearing unit (same as the right bearing unit) 39. An end 13c of the penetrating shaft 13b protrudes from the outer surface of the bearing unit 39. As shown in FIG. 3, the protruding end 13c of the shaft 13b is formed in a rectangular shape.

Here, the left and right top plate members 23 and 25 have a function of supporting the transport surface of the transport belt 17 from behind and also have a function as a frame of the transport mechanism 5. That is, the drive roller 13 is rotatably supported by the frames 23 and 25 via the bearing units 37 and 39 and the L-shaped beam 31.

On the other hand, as shown in FIG. 2, the left and right ends of the vertical wall 35a of the L-shaped beam 35 on the most upstream side are bent upstream, and brackets 51, 51 are respectively attached to the bent pieces 35b, 35b. It is attached rotatably with the pin members 52, 52 as fulcrums. As shown in FIG. 6, each bracket 51 has a semicircular upstream end, and a long slot 53 is opened at the upstream end in the front and rear direction. Then, both ends 15b, 15b of the shaft 15a of the driven roller 15 are inserted through the elongated holes 53, 53.

As shown in FIG. 6, both ends 15b, 15b of the shaft 15a are formed in a rectangular shape, and cannot be rotated in the long holes 53, 53.
Are engaged movably back and forth along. As shown in FIG. 2, the shaft 15a penetrates the driven roller 15, and the driven roller 15 rotates relative to the shaft 15a.

Here, the pair of left and right brackets 5
Reference numerals 1 and 51 have a function as a frame of the transport mechanism 5. That is, the driven roller 15 is connected to the frames 51 and 5.
1 rotatably supported.

As shown in FIG. 2, the brackets 51, 51
The top plate member 55 is joined over the upper edge portion. The top plate member 55 extends long in the left-right width direction, and engagement members 57, 57 protrude from left and right outer vertical walls 55b, 55b (see also FIGS. 3 and 4).

On the upper surface of the top plate member 55, similarly to the above-described left and right outer top plate members 23 and 25, the transport belt 1 is provided.
Steps 55a, 55a are formed to avoid the protruding edges 17a, 17a on the back surface of 7 (see also FIG. 6).

As shown in FIG. 6, each bracket 51 has a rectangular end 1 of the shaft 15a of the driven roller 15.
5b which comes into contact with and presses the upstream side 5b
9 are provided. The other end of the spring 59 is in contact with the plate member 61. The plate member 61 is screwed with the screw rod 63. The screw rod 63 is rotatably supported by a bent piece 51 a at the downstream end of the bracket 51.

As shown in FIG. 5, one side of the plate member 61 is in contact with the outer surface of the bracket 51. Therefore, by rotating the screw rod 63, the plate member 6
1 can be moved back and forth. As a result, the urging force of the spring 59 can be adjusted, and the pressing force for pressing the driven roller 15 upstream can be adjusted. That is,
The distance between the driving roller 13 and the driven roller 15 can be variably adjusted. In this case, the driven roller 15 stops when the tension of the transport belt 17 is balanced.
As a result, even if the length of the transport belt 17 varies, an appropriate tension is always applied to the transport belt 17.

As shown in FIG. 3 and FIG.
Are not on the straight line D connecting the shafts 13a, 13b as the rotation axis of the driving roller 13 and the shaft 15a as the rotation axis of the driven roller 15, and are It is shifted downward. The rotation fulcrums 52, 52 are fulcrums when the frames 23, 25 rotatably supporting the driving roller 13 and the frames 51, 51 rotatably supporting the driven roller 15 are bent.

Therefore, as shown in FIGS. 3 and 4,
When the frames 23, 25, 51, 51 extend straight without being bent, the distance between the rollers 13, 15 becomes longer, and the transport belt 17 wound between the rollers 13, 15 is pulled. As a result, an appropriate tension acts on the belt 17, and the belt 17 does not loosen. Therefore, the object X can be properly conveyed by the conveying belt 17.

On the other hand, at this time, the frames 23, 25, 5
A force acting to bend around the fulcrums 52, 52 acts on 1, 51. In that case, in particular, the fulcrums 52, 5
2 is offset downward from the straight line D connecting the rollers 13 and 15, so that the frames 23, 25, 51, 5
1 tends to bend toward the upper transport surface, as indicated by arrows B and B in FIGS.

At this time, as shown in FIG. 2, FIG. 3, and FIG.
The upper surfaces of the frames 3 and 25 extend to the upstream side and reach the upper side of the brackets 51 and 51, which are the other frames.
As a result, one frame (left and right outer top plate members) 2
3, 25, the other frame (bracket) 51,
51, the upper edges of which abut against the frame 23, 2
5, 51, 51, as shown by arrows B, B,
Bending to the side of the upper transport surface is prevented.

On the other hand, as shown in FIGS.
Has a configuration and an outer appearance in which a main body 71 constituting a lower half and a cover member 72 constituting an upper half are vertically overlapped. Inside the housing 8, a load cell 4 as a load detector and a drive motor 6 as a drive source of the transport mechanism 5 are housed.

As shown in FIG. 4, the fixed end 4b of the strain body 4a of the load cell 4 is fixed to the housing body 71 via a mounting member 75. Free end 4 of flexure element 4a
The drive motor 6 is attached to the connector c via a mounting member 77 and a bracket 79.

As shown in FIG. 5, the drive motor 6 is arranged so that its rotating shaft 73a extends in the vertical direction. In particular, in this embodiment, the rotation shaft 73a of the motor 6 extends downward. Bracket 7
A hollow spacer 81 is assembled to the lower surface of the gear 9, and a gear box 83 is further coupled to the lower end of the spacer 81.

The gear box 83 is inserted through an opening 71a formed in the lower surface of the housing body 71 and protrudes downward from the housing 8 to the outside. A diaphragm 85 is sandwiched between mating surfaces of the spacer 81 and the gear box 83. The diaphragm 85 is also sandwiched by a peripheral portion of the opening 71a and a ring member 87 attached to the peripheral portion, and closes the opening 71a.

As shown in FIGS. 3 to 5, the gear box 8
3 are hollow cylindrical members 91,
93 extends horizontally. Of these, as shown in FIGS. 4 and 5, the cylindrical member 91 that faces the side where the two engaging members 41 and 57 protrude from the side surface of the transport mechanism 5 (the left side in the illustrated example) is used. V is a side view of the extension end of the member 91.
A U-shaped arm member 95 is attached (see also FIG. 2). Arms 95a and 95 before and after this arm member 95
b extend obliquely upward so as to separate from each other, and cutouts 95c, 9 formed at the upper end portions of the arms 95a, 95b.
The engaging members 41 and 57 of the transport mechanism 5 are engaged with 5d, respectively.

On the other hand, on the side surface of the transport mechanism 5, a cylindrical member 93 heading toward the side (the right side in the illustrated example) on which the one engaging member 57 and the rectangular end portion 13c of the shaft 13b of the drive roller 13 protrude. As shown in FIGS. 3 and 5, an arm member 9 having a V-shape in side view is attached to the extended end of the cylindrical member 93.
7 (see also FIG. 2). The front and rear arms 97a and 97b of the arm member 97 extend obliquely upward so as to be separated from each other. Among them, the upstream (rear) arm 97b extending toward the engagement member 57 has a notch 97c at the upper end. The notch 97c is engaged with the engaging member 57 of the transport mechanism 5.

On the other hand, the shaft 1 of the driving roller 13
As shown in FIG. 5, an elongated cover member 99 is attached to the outer surface of the downstream (front) arm 97a extending toward the end 13c of the 3b. Then, the small room 1 sealed by the arm 97a and the cover member 99.
40 is formed, and the support plate 100 is incorporated inside the small room 140.

As shown in FIG. 5, a transmission shaft 101 is accommodated in the right cylindrical member 93.
1 and the bevel gear 105 assembled to the rotating shaft 73a of the motor 73 mesh with each other. The transmission shaft 101 extends to the inside of the small room 140 and is rotatably supported by the support plate 100 and the like. A transmission pulley 107 is attached to the transmission shaft 101 at a portion inside the small room 140.

On the other hand, as shown in FIG.
00, the shaft 13b of the drive roller 13
A second transmission shaft 109 is rotatably supported at a position corresponding to the above, and a second transmission pulley 111 is assembled to the shaft 109. And both transmission pulleys 1
An endless timing belt 113 for power transmission is wound around between 07 and 111.

Here, the second transmission shaft 109 has a V
8, it projects inward from the downstream arm 97 a of the U-shaped arm member 97 toward the transport mechanism 5, and as shown in FIG.
A rectangular hole 109 that can be fitted to the rectangular end portion 13c of FIG. 3b.
b is formed (see also FIG. 2).

As described above, the spacer 81, the gear box 83, the pair of left and right horizontal cylindrical members 91 and 93, and the V-shaped arm members 95 and 97 support the transport mechanism 5 and also connect the transport mechanism 5 to the load cell 4. The support frame 9 connected to the free end 4c side of the strain body 4a is configured as a whole. The drive motor 6 is housed in the housing 8, and the shafts 101, 1 for transmitting the drive force of the drive motor 6 to the transport mechanism 5 are provided in the support frame 9.
09, pulleys 107 and 111, timing belt 11
A power transmission mechanism 7 composed of a power transmission mechanism 3 and the like is accommodated. As a result, the upper surface and side surfaces of the housing 8 and the surface of the support frame 9 have a neat appearance without any irregularities such as openings and projections, and are configured to be easy to clean.

Next, the operation of the weighing device 1 according to this embodiment will be described.

First, when the transport belt 17 is attached to the transport mechanism 5 and brought into a use state, as shown in FIG.
The frames 23, 25, 51, 51 are bent at the bending fulcrum 52 to the opposite side of the transport surface, and the belt 17 is wound around the rollers 13, 15 in this state. At this time, roller 1
Since the distance between 3 and 15 is short, the belt 17 can be easily wound around in a loose state.

Next, the frames 23, 25, 51, 51
Is rotated in the directions indicated by the arrows B and B about the bending fulcrum 52 so as to assume a linearly extended posture as shown in FIG. These frames 23, 25, 51, 51 are bent fulcrum 5
When the belt is not bent at 2 and 52 and is in a posture extending in a straight line, the distance between the rollers 13 and 15 is long, so that the transport belt 17 is appropriately pulled, and the belt 17 is Stable mounting between 15

On the other hand, the elastic restoring force of the belt 17 acts on the frames 23, 25, 51, 51 as a reaction of the tension of the conveyor belt 17. The external stress is
The frames 23, 25, 51, 51 are
It is attempted to bend the head in two directions in the direction B, B or the direction opposite to the conveying surface. However, as described above, the bending fulcrums 52, 52 are not on the straight line D connecting the rollers 13, 15, and are particularly offset and disposed below the opposite side to the transport surface. 2
5, 51, and 51, for example, always try to bend upward B, B on the transport surface side when in a straight posture as shown in FIG.

At that time, as described above,
The upper edges of the brackets 51, 51, which are one frame, are connected to the left and right outer top plate members 2, which are the other frames.
The frames 23, 25, 51, 51 of the transport mechanism 5 eventually come into contact with the upper surfaces of the transfer mechanisms 5, because the frames 23, 25, 51, 51 are prevented from further bending in the B, B directions beyond the straight posture.
The linear posture during use is maintained and locked.

Therefore, for example, the frames 23, 25,
There is no need to separately provide a dedicated lock pin or the like for preventing the bends 51, 51, so that the configuration of the transport mechanism 5 is simplified, the tare weight Wq is reduced, and the measurement accuracy is improved. Further, the cleaning operation of the transport mechanism 5 becomes easy, and the cleaning property is improved. Further, there is no need to operate the lock pins and the like, and the frames 23, 25, 51, 5
The belt 17 for conveyance can be attached and detached only by bending or stretching 1 in a linear shape.

When the transport mechanism 5 is assembled in a posture for use, the rectangular end 13c of the shaft 13b of the drive roller 13 is moved to the second transmission shaft 109 projecting inward from the V-shaped arm 97a on the right downstream side. The protrusion 109a is fitted into a rectangular hole 109b.

Next, the engaging member 41 of the bearing unit 37, which also supports the shaft 13a of the left driving roller 13 on the downstream side, is inserted into the notch 9 of the V-shaped arm 95a on the left downstream side.
5c. Then, as shown by reference numeral C in FIG. 11, the transport mechanism 5 is lowered onto the support frame 9 with these engaging portions (13c and 109b, and 41 and 95c) as fulcrums, whereby the transport mechanism is lowered. 5 are engaged with the notches 95d, 97c of the left and right V-shaped arms 95b, 97b. As a result, the transport mechanism 5 is supported by the support frame 9, and the weighing conveyor 2 and thus the weighing device 1 are completed.

Then, by driving the drive motor 6, the bevel gears 105 and 103, the first transmission shaft 101, the first transmission pulley 107, the power transmission timing belt 11
3, the driving force of the motor 6 is transmitted to the driving roller 13 via the second transmission pulley 111 and the second transmission shaft 109, whereby the upper transport surface of the transport belt 17 travels in the direction of arrow A, The object X is conveyed.

On the other hand, the free end 4c of the flexure element 4a of the load cell 4 is
Drive motor 6, spacer 81, gear box 8
3. The support frame 9 including the cylindrical members 91 and 93, the V-shaped arms 95 and 97, and the cover member 99, the power transmission mechanism 7 including the transmission shaft 101 and the pulley 107, and the transport mechanism 5 are connected. , The total weight of the conveyor device 3 composed of these is always the load cell 4 as the tare weight Wq.
Has been loaded. During the transportation of the weighing object X, the weight of the weighing object X is added thereto, so that the weight of the weighing object X is detected from the weight difference.

In this embodiment, in particular, in the present embodiment, the transport mechanism 5 for the load cell 4, the drive motor 6,
By arranging the power transmission mechanism 7 and the arrangement of the power transmission mechanism 7, the center of gravity R of the conveyor device 3 constituted by these components is close to the moment center S of the load cell 4.

That is, as shown in FIGS. 4 and 5, the center of gravity R of the conveyor device 3 is
It is close to the moment center S of the load cell 4 by a short distance L. Further, as shown in FIGS. 2 and 4, the center of gravity R of the conveyor device 3 is close to the moment center S of the load cell 4 by a short distance L in the direction of conveyance of the object X (front-back direction). I have. 2 and FIG.
As shown in the figure, the center of gravity R of the conveyor device 3 is
In the width direction (horizontal direction) of the transfer, the load cell 4 is close to the moment center S by a short distance L.

In the vertical direction, as shown in FIGS. 4 and 5, first, the transport mechanism 5 was disposed above the load cell 4, and the drive motor 6 was disposed at a position substantially at the same height as the load cell 4. Therefore, in this case, the center of gravity R of the conveyor device 3 is too far upward from the moment center S of the load cell 4. Therefore, the rotation shaft 73 of the drive motor 6
a is arranged so as to extend downward, and the power transmission mechanism 7 (and the support frame 9), which is another heavy object, is arranged to extend from a position below the load cell 4 to the transport mechanism 5 above. . That is, the power transmission mechanism 7 and the support frame 9 are also provided at a position below the load cell 4. As a result, the bias of the center of gravity R of the conveyor device 3 is corrected, that is, the center of gravity R is lowered and approaches the moment center S of the load cell 4.

At this time, conversely, if the power transmission mechanism 7 is arranged to extend upward from a position above the load cell 4 or to extend upward from a position substantially at the same height as the load cell 4, The deviation of the center of gravity R of the conveyor device 3 is not corrected, and the center of gravity R is rather undesirably moved upward.

Incidentally, for example, the drive motor 6 may be initially arranged at a position lower than the load cell 4.

As shown in FIGS. 2 and 4, first, the load cell 4 is disposed substantially at the center of the transport mechanism 5 in the transport direction, and the drive motor 6 is moved more in the transport direction than the load cell 4. Located upstream. Therefore, in this case, the center of gravity R of the conveyor device 3 is
Is too far from the moment center S to the upstream side in the transport direction. Therefore, the drive roller 13 is disposed on the downstream side in the transport direction, and the power transmission mechanism 7 (and the support frame 9), which is another heavy object, is directed from the position on the upstream side of the load cell 4 to the drive roller 13 on the downstream side. It was arranged to extend. Thus, the center of gravity R of the conveyor device 3
Is corrected, the center of gravity R shifts downstream in the transport direction, and approaches the moment center S of the load cell 4.

On the contrary, if the driving roller 13 is arranged on the upstream side in the transport direction and the power transmission mechanism 7 is arranged to extend only in the region on the upstream side of the load cell 4, the center of gravity R Is not corrected, and the center of gravity R is rather shifted to the more upstream side, which is not preferable.

For example, when the drive motor 6 is first arranged downstream of the load cell 4 in the transport direction, the drive roller 13 is arranged upstream of the transport direction, and the power transmission mechanism 7 is located downstream of the load cell 4. To extend from the position on the side to the position on the upstream side.

FIG. 2 shows the conveyance width direction (left-right direction).
As shown in FIG. 5, first, the load cell 4 was disposed at substantially the center of the transport mechanism 5 in the transport width direction, and the drive motor 6 was disposed at substantially the same position as the load cell 4. Therefore, in this state, the center of gravity R of the conveyor device 3 coincides with the moment center S of the load cell 4 in the transport width direction. However, the power transmission mechanism 7 (and the supporting frame 9), which is another heavy object, must be disposed between the drive motor 6 and the transport mechanism 5, and at that time, the center of gravity R of the conveyor device 3 is changed. It is conceivable that the load cell 4 moves to the left or right in the transport width direction from the moment center S.

However, compared to the weight of the power transmission mechanism 7,
Since the weight of the transport mechanism 5 and the weight of the drive motor 6 are much heavier, even if the power transmission mechanism 7 is arranged on one of the right and left sides in the transport width direction, the center of gravity R of the conveyor device 3
Of the load cell 4 from the moment center S of the load cell 4 does not become so large. Therefore, the power transmission mechanism 7 is arranged so as to extend from substantially the same position as the load cell 4 in the transport width direction toward the left or right side in the transport width direction. At this time, even with the presence of the support frame 9 having a substantially symmetrical shape in the left and right directions, the extent to which the center of gravity R of the conveyor device 3 shifts in the transport width direction is suppressed.

Needless to say, the power transmission mechanism 7 may be provided two symmetrically on the left and right.
There is a concern that the rotation of the motor may be twisted. Further, the tare weight Wq increases, which is not preferable in terms of weighing accuracy.

Incidentally, for example, the drive motor 6 may first be arranged on the left side or right side of the load cell 4 in the transport width direction. In that case, the power transmission mechanism 7 is disposed so as to extend left and right across the load cell 4 in the transport width direction. That is, when the drive motor 6 is disposed on the left side of the load cell 4, the power transmission mechanism 7 is disposed so as to extend from the left side of the load cell 4 to the right side. At this time, the power transmission timing belt 113 and the like are disposed on the right side of the transport mechanism 5. Conversely, when the drive motor 6 is disposed on the right side of the load cell 4, the power transmission mechanism 7 is disposed so as to extend from the right side to the left side of the load cell 4. At this time, the power transmission timing belt 113 and the like are disposed on the left side of the transport mechanism 5.

As described above, the center of gravity R of the conveyor device 3
Is a three-dimensionally short distance L to the moment center S of the load cell 4 in the up-down direction, the front-back direction, and the left-right direction.
, The moment force acting on the load cell 4 can be kept small. Therefore, the frequency band of the noise component to be removed which is generated due to the moment force is increased, the filter processing time of the low-pass filter can be shortened, and the measurement can be speeded up.

Further, in this case, by arranging the transport mechanism 5, the drive motor 6, and the power transmission mechanism 7 with respect to the load cell 4, the center of gravity R of the conveyor device 3 constituted by these components is adjusted to the moment center of the load cell 4. In order to bring the center of gravity R of the conveyor device 3 close to the moment center S of the load cell 4, the transport mechanism 5 is enlarged, and the load cell 4, the drive motor 6, or the power transmission mechanism 7 Is not accommodated, the weight of the transport mechanism 5 and hence the tare weight Wq of the conveyor device 3 do not increase.

Therefore, the tare weight Wq and the center distance L
Can be reduced, and the moment force acting on the load cell 4 is effectively and reliably suppressed to a small value. Therefore, the frequency band of the noise component is reliably increased, the filtering time of the low-pass filter is reliably reduced, and the high-speed measurement is ensured.

In this embodiment, the load detector 4
The transport mechanism 5 is disposed above the load detector 4, but the transport mechanism 5 may be disposed below the load detector 4, as shown in FIG. In this case, for example, as shown in the figure, the rotation shaft 73a of the drive motor 6 is disposed so as to extend upward, and the power transmission mechanism 7 and the support frame 9 are moved from a position above the load cell 4 to a position below the load cell 4. To extend to That is, contrary to the above-described example, a part of the power transmission mechanism 7 and a part of the support frame 9 are also provided at a position above the load cell 4. As a result, the center of gravity R of the conveyor device 3 is raised, and approaches the moment center S of the load cell 4.

In this case, the drive motor 6 is disposed close to the load cell 4 in the vertical direction. That is,
For example, the drive motor 6 may be arranged at the same height as the load cell 4 or at a position slightly higher than the load cell 4.

In the above embodiment, the load cell 4 is used as the load detector. However, the present invention is not limited to this. For example, an electromagnetic balance type load detector may be used.

[0097]

As described above, according to the present invention,
In a weighing conveyor for weighing while transporting an object to be weighed and a weighing device provided with the weighing conveyor, the center of gravity and the load of the conveyor device are increased without increasing the weight (tare weight) of the conveyor device supported by a load detector. The center of the moment of the detector can be made closer. Therefore, the distance between the centers is reduced, the moment force acting on the load detector is effectively reduced, and the frequency band of the noise component is increased. As a result, the filter processing time is shortened, and the measurement can be speeded up.

According to the present invention, a conveyor device having a transport mechanism, a drive source, and a power transmission mechanism is supported by a load detector.
The present invention is widely and preferably applicable to various types of measuring conveyors and measuring apparatuses, such as a belt conveyor type, a roller conveyor type, an article placing type, and an article clamping type.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view of a weighing device according to an embodiment of the present invention.

FIG. 2 is a plan view mainly showing a transport mechanism of the weighing device.

FIG. 3 is a partially cutaway right side view of the upper part of the weighing device.

FIG. 4 is a left side view of an upper portion of the weighing device, and is a partial longitudinal sectional view showing a structure inside a housing.

FIG. 5 is a vertical cross-sectional view of the upper portion of the weighing device, as viewed from the upstream side in the transport direction to the downstream side.

FIG. 6 is a main part enlarged side view showing a periphery of a support portion of a driven roller of the weighing device.

FIG. 7 is an enlarged cross-sectional view showing engagement between a transport belt and a roller.

FIG. 8 is a partially enlarged view showing an output end of the power transmission mechanism.

FIG. 9 is an explanatory view of assembling the transport mechanism.

FIG. 10 is an explanatory diagram of an operation of the transport mechanism.

FIG. 11 is an explanatory view of the assembly of the weighing device.

FIG. 12 is a schematic side view of a weighing device according to the present invention in which a transport mechanism is arranged below a load detector.

FIG. 13 is a side view showing a schematic configuration of a conventional typical weighing conveyor.

FIG. 14 is a side view showing a schematic configuration of a conventionally known weighing conveyor.

[Explanation of symbols]

 Reference Signs List 1 weighing device 2 weighing conveyor 3 conveyor device 4 load cell (load detector) 5 transfer mechanism 6 drive motor (drive source) 7 power transmission mechanism 8 housing 9 support frame R center of gravity of conveyor device S center of moment of load detector X Weighing object

Claims (7)

[Claims] 1. A weighing conveyor for weighing an object to be weighed while transporting the object, a transport mechanism for transporting the object, a drive source for driving the transport mechanism, and a driving force of the drive source. A power transmission mechanism for transmitting the power to the transport mechanism, a load detector supporting the power transmission mechanism and detecting the weight of the object to be weighed being transported by the transport mechanism, wherein the transport mechanism is disposed above the load detector, and a driving source Is disposed in the vertical direction at substantially the same position as the load detector or at a position lower than the load detector, and the power transmission mechanism is disposed so as to extend between the lower position and the upper position with the load detector interposed therebetween. A weighing conveyor characterized in that the combined center of gravity of the transport mechanism, the drive source, and the power transmission mechanism is close to the center of moment of the load detector in the vertical direction. 2. A weighing conveyor for weighing an object to be weighed while conveying the object, comprising: a conveying mechanism for conveying the object to be weighed; a driving source for driving the conveying mechanism; and a driving force of the driving source. A power transmission mechanism for transmitting the power to the transport mechanism, a load detector supporting the power transmission mechanism and detecting the weight of the object to be weighed being transported by the transport mechanism, wherein the transport mechanism is disposed below the load detector, and a driving source Is disposed at substantially the same position as the load detector in the vertical direction, and the power transmission mechanism is arranged to extend between the upper position and the lower position with the load detector interposed therebetween, so that the transport mechanism and the drive source A weighing conveyor characterized in that a combined center of gravity with a power transmission mechanism is close to a center of moment of a load detector in a vertical direction. 3. A weighing conveyor for weighing an object to be weighed while transporting the object, comprising a transport mechanism for transporting the object, a drive source for driving the transport mechanism, and a driving force of the drive source. A power transmission mechanism that transmits the load to the transport mechanism, and a load detector that supports these and detects the weight of the object to be transported by the transport mechanism. Almost at the center, the drive source is arranged close to the load detector, and the power transmission mechanism is arranged to extend between the downstream position and the upstream position in the transport direction with the load detector interposed. Wherein the combined center of gravity of the transport mechanism, the drive source and the power transmission mechanism is brought closer to the moment center of the load detector in the transport direction. 4. A weighing conveyor for weighing an object to be weighed while transporting the object, a transport mechanism for transporting the object, a drive source for driving the transport mechanism, and a driving force of the drive source. A power transmission mechanism for transmitting to the transport mechanism, and a load detector that supports these and detects the weight of the object to be transported by the transport mechanism; And the drive source is disposed at substantially the same position as the load detector in the transport width direction, and the power transmission mechanism is disposed at substantially the same position as the load detector in the transport width direction and at the left or right position in the transport width direction. By disposing the transfer mechanism, or extending between the position on the left side and the position on the right side in the transport width direction across the load detector, the transport mechanism, the drive source, and the power transmission mechanism are combined. Center of gravity in the width direction A weighing conveyor characterized by being brought close to the moment center of the load detector. 5. A load detector is disposed substantially at the center of the transport mechanism in the transport direction of the object to be weighed, a drive source is disposed close to the load detector, and a power transmission mechanism is disposed in the transport direction with the load detector interposed therebetween. By arranging so as to extend between the downstream position and the upstream position, the combined center of gravity of the transport mechanism, the drive source, and the power transmission mechanism is brought close to the moment center of the load detector also in the transport direction. The weighing conveyor according to claim 1 or 2, wherein: 6. A load detector is disposed substantially at the center of the transport mechanism in the transport width direction of the object to be weighed, a drive source is disposed at substantially the same position as the load detector in the transport width direction, and the power transmission mechanism is transported in the transport width direction. Extending in the direction between the substantially same position as the load detector and the left or right position in the conveying width direction, or extending between the left position and the right position in the conveying width direction across the load detector. 6. The arrangement as described above, wherein the combined center of gravity of the transport mechanism, the drive source, and the power transmission mechanism is also close to the moment center of the load detector in the transport width direction. Weighing conveyor. 7. A weighing device comprising the weighing conveyor according to any one of claims 1 to 6.