JPH1019648A - Weighing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the lowering of natural oscillation frequency of a load cell as a spring system and thereby realize heightening of weighing speed, by providing an opening/closing device of a hopper on the side of a device body so that a distance between the load cell housed in the device body and this weighing hopper disposed outside the device body may not become long. SOLUTION: A support body 68 and a lower case 61 are connected to a load cell 66 housed in the interior of a support table 5 and further a weighing hopper 9 is attached to this lower case 61 via a support bracket 62. In this event, the lower part of an upper case 41 is formed into an inclined surface 41a and the lower case 61 is disposed in a space A produced below on the skew outside the support table 5 by this inclined surface 41a. Further, opening/ closing drive motors, etc., for the weighing hopper 9 and a pool hopper 8 are housed in an upper bulging part of the upper case 41. With this, the hopper 9 comes relatively close to the load cell 66 and a distance L between the two does not become long.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a weighing device, and more particularly to a weighing device having a structure in which a load detector such as a load cell and a hopper to which an object to be weighed is supplied are connected to the inside and outside of the device main body via a support member. It relates to a weighing device.

[0002]

2. Description of the Related Art For example, a combination weighing type weighing device used for automatic weighing of various articles is provided with a large number of weighing hoppers. The combination calculation is performed based on the weighed value, and as a result, an optimum combination in which the combination addition value matches or is closest to the target weight is determined, and only the weighing hopper corresponding to the optimum combination is used to weigh. By discharging a product, a product having the target weight or the weight closest to the target weight is obtained.

In this case, in this type of weighing apparatus, a load cell of a strain gauge type or the like is widely used as a load detector for measuring the weight of the article. This load cell generally uses a rigid body in which a pair of upper and lower beams is erected between a fixed rigid body portion and a movable rigid body portion located at both ends to form a hollow square shape, and the rigid body in the flexural body is used. The vicinity of the connecting portion between the portion and the beam portion is defined as a thin flexible portion, and the magnitude of tensile strain or compressive strain generated in each flexible portion when a load is applied to the movable rigid portion is attached to the flexible portion. This is detected by a strain sensor such as a strain gauge.

Therefore, in the weighing device, the weighing hopper is connected to the movable rigid portion of the load cell as a tare so that the weight of the object supplied to the weighing hopper is measured by the load cell. However, in this case, the load cell is housed inside the main body of the weighing device to ensure stable weighing accuracy, etc., while the weighing hopper is placed outside the main body in consideration of periodic inspection and periodic cleaning. Is usually performed.
As disclosed in Japanese Unexamined Patent Application Publication No. 7-49259 or JP-A-7-49259, a movable member of a load cell is firstly connected to a support member extending over the inside and outside of the weighing device main body. A weighing hopper is attached, and the weighing hopper is arranged outside the apparatus main body.

[0005]

As described above, the load cell as a load detector detects the load based on the amount of deformation of the flexure element when a load is applied to the movable rigid body. And, when the load is removed, it is configured to restore to its original shape,
The flexure element itself is considered as a kind of leaf spring system.

On the other hand, the weighing hopper is provided with a gate for opening and closing the lower discharge port, and is used for opening and closing the gate to discharge the weighed object when the supplied weighed object satisfies the optimum combination. An opening / closing drive device including a link mechanism and the like is provided.

In this case, as disclosed in the above publication, a link mechanism of the opening / closing drive device is generally provided on the hopper side arranged outside the device in connection with the gate, and the link mechanism is provided on the hopper side. An operation arm of the opening / closing drive device for operating the link mechanism, a motor as a drive source, a transmission mechanism for transmitting the driving force of the motor to the operation arm, and the like are provided on the apparatus main body side. However, if such a link mechanism or the like is mounted on the hopper side, it will hinder the inspection work and cleaning work of the hopper, and the interval between adjacent hoppers must be large, so that the entire apparatus becomes large. Therefore, in order to simplify the hopper structure, it is conceivable to provide a link mechanism provided on the hopper side on the apparatus main body side.

However, in such a case, since these link mechanisms are provided in the apparatus main body in addition to the load cell, the drive motor, the transmission mechanism, and the like, the main body swells outward correspondingly, and as a result, the hopper arrangement position Is relatively distant from the apparatus main body, and the horizontal distance between the load cell and the hopper, or the length of the support member that connects the two, becomes longer. Then, the moment length from the fixed rigid part of the load cell, which is a fixed point as a leaf spring, to the supply position of the object to be weighed becomes longer, the natural frequency as a spring system becomes lower, and the time until the weighing value becomes stable is It takes a long time, and it is necessary to increase the strength of the noise filter in order to cut low-frequency noise such as the motor noise of other devices and equipment transmitted from the floor or the like that often occurs in the workplace. It takes time to detect the value, which hinders the high-speed processing of the weighing device.

In this type of weighing device, in addition to the above-described weighing hopper, when the weighing hopper is discharged and emptied from the weighing hopper, the weighing device supplies the weighing object participating in the next combination operation. In many cases, the pool hopper is provided directly above the weighing hopper, and when the opening and closing drive device for opening and closing the gate of the pool hopper is also provided on the apparatus main body side, the degree of bulging of the main body further outwards is further increased. And the problem of low frequency increases.

SUMMARY OF THE INVENTION The present invention has been made to address the above-described problems, and is directed to a case where a large number of members are provided on the weighing apparatus main body side, and as a result, the apparatus main body bulges outward. Even, it is possible to shorten the distance between the load detector housed inside the device main body and the weighing hopper disposed outside the main body or the supply position of the object to be weighed,
Therefore, it is an object to provide a weighing device that can perform high-speed weighing work and does not need to increase the strength of a noise filter.

[0011]

The present invention is specified as follows in order to solve the above-mentioned problems.

That is, the invention according to claim 1 of the present invention (hereinafter referred to as "first invention") is accommodated in the apparatus main body, deformed by the applied load, and based on the amount of deformation, Load detecting means for detecting a load, a support member connected to the load detecting means and extending inside and outside the apparatus main body, and disposed outside the apparatus main body and connected to the load detecting means via the support member And a weighing hopper having a gate for discharging the object to be weighed while the weight of the supplied object to be weighed is measured by the load detecting means, wherein the gate of the weighing hopper is opened and closed. An opening / closing drive device is provided on the apparatus main body side, and a side wall of the main body that separates the load detecting means and the weighing hopper into and out of the main body is inclined in the up and down direction, and the inclination of the main body side wall is inclined. By the closing drive device bulging portion generated in the main body is housed, and, characterized in that the support member protrudes space created under obliquely on or diagonal body outside.

According to the first aspect of the present invention, the load detecting means of the spring system housed inside the main body is interposed between the measuring hopper connected to the detecting means via the supporting member and arranged outside the main body. The main body side wall is inclined in the vertical direction, and the opening / closing drive device of the weighing hopper is accommodated in a bulge formed on the main body side due to this inclination. Since the support member protrudes, when the weighing hopper is attached to this support member,
The hopper is arranged outside the main body without being moved away from the apparatus main body without being affected by the expansion of the main body. As a result, the horizontal distance between the load detection means and the supply position of the weighing hopper or the object to be weighed is not increased, and
Low frequency of the load detecting means is avoided, and it is not necessary to increase the strength of the noise filter, so that high-speed processing of the weighing operation can be performed.

Further, the invention according to claim 2 (hereinafter referred to as “second
Invention ". According to the first aspect of the present invention, the opening / closing drive device includes a drive source, a transmission mechanism for transmitting a drive force of the drive source, and an opening / closing operation of the weighing hopper driven by the drive force transmitted by the transmission mechanism. And an operating member, wherein the transmission mechanism is provided along the supporting member.

According to the second aspect of the invention, in particular, the transmission mechanism in the opening / closing drive mechanism for opening / closing the weighing hopper is arranged along the support member projecting into a space formed obliquely above or below the main body due to the inclination of the main body side wall. As a result, the disposition of the transmission mechanism prevents the weighing hopper from being excessively moved away from the apparatus main body.

Further, in the invention according to claim 3 (hereinafter referred to as "third invention"), in the first invention, a pool hopper for supplying an object to be weighed to the weighing hopper is disposed above the weighing hopper. An opening / closing drive device for opening and closing the pool hopper is housed in a bulge formed on the main body side, and a pool hopper is attached to the bulge.

According to the third aspect of the invention, the pool hopper for supplying the object to be weighed to the weighing hopper is disposed above the weighing hopper, and the opening / closing drive device for opening and closing the pool hopper is provided on the apparatus main body side. In this case, since the drive device for the pool hopper is housed in the bulging portion of the main body, even if the degree of bulging of the bulging portion becomes large, it does not affect the projecting position of the support member or the disposition position of the weighing hopper. Therefore, the distance between the load detecting means and the weighing hopper is kept short. Further, since the pool hopper is attached to the bulging portion, the pool hopper is disposed above the weighing hopper disposed near the main body by utilizing the space outside the main body generated by the inclination of the main body side wall. It is possible to do.

[0018]

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

FIG. 1 is a schematic front view showing the overall structure of a combination weighing type weighing device 1 according to the present invention. On a frame 2 of the weighing device 1, a base 3 having an opening 3a at the center is provided. The base 3 is provided with a support 5 in the shape of a frustoconical cone with a plurality of supporting legs 4. On the upper surface of the support table 5, an excitation type dispersion table 6 and a plurality of excitation type troughs 7... 7 arranged radially around the distribution table 6 are provided. A pair of upper and lower pool hoppers 8 and 8 and weighing hoppers 9 and 9 are provided on the peripheral surface 5a corresponding to the troughs 7 and 7 respectively. (Not shown) are distributed and supplied to the respective troughs 7..., And then supplied to the weighing hoppers 9.
Here, each weight is measured and a combination calculation is performed.

Around the legs 4,..
A ring member 10 is mounted via brackets 4a... 4a erected on... 4, and the same number of individual chutes 11... 11 as the weighing hoppers 9. 11a... 11a to form a collective chute as a whole,
A funnel-shaped discharge chute 1 is provided in the central opening 3a of the base 3.
2 is the individual chute 11 by an attachment member (not shown).
.., And is discharged from the weighing hoppers 9... 9 through the individual chutes 11. 12 lower end outlet 12a
From the group.

In this case, the individual chutes 11... 11
The lower end thereof rests on the upper edge of the discharge chute 12, and is rotated about the locking point between the ring member 10 and the hooks 11 a. The inclination angle can be freely changed. In FIG. 1, troughs 7,...
8, only the weighing hoppers 9 ... 9 and the individual chutes 11 ... 11 are shown.

Next, the configurations of the pool hopper 8 and the weighing hopper 9 will be described. As shown in FIG. 2, the pool hopper 8 and the weighing hopper 9 in the weighing device 1 have upper openings 21a and 31a and lower outlets 21b and 31b, respectively.
Hopper bodies 21 and 31 each having a rectangular cross section with a flat section
And lower outlets 21b, 31 of the hopper bodies 21, 31
b, a pair of mounting brackets for mounting the hopper bodies 21, 31 to the support base 5 side, although only the front side is shown in the drawing. 23, 23; 33, 33 are respectively provided on the opposing surfaces, and the gate 2
2, 32, the gates 22, 32 are connected to the hopper body 21,
Connection brackets 24 and 34 for connecting to the base 31 are provided. And these connecting brackets 2
Reference numerals 4, 34 denote the mounting brackets 23, 23;
The hopper main bodies 21 and 31 are rotatably provided around the support shafts 25 and 35 via the support shafts 3, and swing about the support shafts 25 and 35 as shown by arrows a and b, thereby the gate 2.
2, 32 are lower outlets 21b of the hopper bodies 21, 31;
31b is opened and closed.

On the other hand, an upper case 41 and a lower case 6 of a hopper unit
1, a pair of support brackets 42, 42; 62, 62 formed in a predetermined shape are provided on each of the cases 41, 61, although only the front side is shown in the drawing. A bolt 42a is embedded at a substantially intermediate position between the support brackets 42 in the upper case 41 (see FIG. 3). Then, the mounting brackets 23 for the pool hopper 8 and the weighing hopper 9,
23; between the upper and lower two shaft members 2
6, 27; 36, 37 are erected, and the shaft members 26, 36, 37 of these are mounted on the support bracket 42,
42; 62, 62; and the shaft member 27 is brought into contact with the head of the bolt 42a, whereby the pool hopper 8 and the weighing hopper 9 are moved upward and downward.
1 and is detachably attached to the support base 5.

Further, in FIG. 2, extending portions 24a, 34a are respectively provided on the front side of the connecting bracket 24 of the gate 22 of the pool hopper 8 and on the other side of the connecting bracket 34 of the gate 32 of the weighing hopper 9. Rollers 28 and 38 are rotatably provided on these extending portions 24a and 34a. Correspondingly, the upper case 41 and the lower case 61 correspond to the front side and the rear side, respectively. Are provided with operation arms 44 and 64 that swing about support shafts 43 and 63, respectively, and the distal ends thereof are engaged so as to grip the rollers 28 and 38 of the extended portions 24a and 34a. . Therefore, the operation arms 44, 64
Swings about the support shafts 43 and 63 as shown by arrows c and d, so that the gates 22 and 32 are moved by arrows a and b through the engagement between the arms 44 and 64 and the rollers 28 and 38. As a result, the lower discharge ports 21b and 31b of the hopper bodies 21 and 31 are opened and closed. Note that arrows a and b and arrows c and d in the figure or arrows e and f described later
Are shown in order to clarify the direction of the swing, but do not indicate the range of the swing.

Next, the configuration of the hopper unit 40 mounted on the peripheral surface 5a of the support base 5, including the drive mechanism of the operation arms 44 and 64, will be described.

FIGS. 3 and 4 are longitudinal sectional views of a hopper unit 40 mainly showing a driving mechanism of an upper operation arm 44 for opening and closing the pool hopper 8 and a lower operation arm 64 for opening and closing the weighing hopper 9, respectively. , Upper case 4
1 has an upper portion bulging outward and a lower portion having an inclined surface 41.
a, which is fixed to the peripheral surface 5a of the support base 5 at the peripheral flange portion with a plurality of bolts 91... 91 and from the inner surface of the lower flange portion to the base member 92.
Are set up substantially vertically, and the base member 92 is further fixed to a mounting frame 41d connected to the upper case 41, though not shown in detail.

A motor housing 93 is mounted on the inner surface of the upper bulged portion 41b with bolts 94, and a drive motor 95 is housed in the housing 93. The rotating shaft 96 of the drive motor 95 extends in both end directions as shown in FIG. 5, and the first cam 45 and the second cam 65 each having a predetermined profile are integrally connected to each shaft end.

Further, a bearing portion 97 is formed so as to protrude from the inner surface of the upper bulging portion 41b to above the driving motor 95. The bearing portion 97 and the front wall surface of the case 41 not shown in FIG. A rotating shaft 43 is rotatably supported. An upper operating arm 44 is integrally connected to a protruding end on the outer side of the rotary shaft 43 by, for example, a pin or the like, and a block body 47 having a cam follower 46 driven along the first cam 45 is provided as a case. Inside 41, it is also integrally connected to the rotating shaft 43.

The block 47 is provided with a pin 48.
Is mounted, and a spring 51 is stretched between the pin 48 and the pin 50 projecting from the base member 92. The spring 51 allows the block body 47 and the operation The arm 44 is the support shaft 4
The cam follower, which is always urged in the direction of arrow c around the center 3 in the direction of opening the pool hopper 8, and is disposed at the engaging portion between the operation arm 44 and the roller 28 on the opposite side to the support shaft 43. 46 is always pressed in the direction of the first cam 45.

As a result, when the cam 45 is rotated by the drive of the drive motor 95 and the lift of the cam follower 46 is increased, the operation arm 44 is moved in the direction of arrow d against the urging force of the spring 51, that is, the pool hopper 8 is moved. When the lift amount of the cam follower 46 decreases, the operation arm 44 swings in the direction of arrow c, that is, the direction in which the pool hopper 8 opens, by the urging force of the spring 51.

Next, the configuration of the lower operation arm 64 will be described. The operation arm 64 is for opening and closing the weighing hopper 9 for measuring the weight of the supplied object to be weighed.
A fixed rigid body 66a of a load cell 66 as a load detector for measuring the weight of the object to be weighed is fixed to the base member 92 with bolts 67,67. The movable rigid portion 66b of the load cell 66 has a support member 6 for supporting a link member 72 for the lower operation arm 64 described below.
8 is similarly fixed by bolts (not shown), and the lower case 61 is further integrally attached to the support 68. In this case, a circular opening 41c is formed in the lower inclined surface 41a of the upper case 41, and the lower case 61 is attached to the support body 68 through the opening 41c. Of the support table 5 or the lower inclined surface 41a of the upper case 41 is located obliquely below the outer surface. In addition, a diaphragm 69 for closing the opening 41c is sandwiched between the joining surface of the lower case 61 and the support 68.

The support 6 attached to the load cell 66
A support shaft 70 protrudes from an upper end of the support member 8, and a first link member 72 having a cam follower 71 driven along the second cam 65 is rotatably supported on the support shaft 70. A pin 73 protruding from the first link member 72
A spring 75 is extended between the support member 68 and a pin 74 protruding from the support member 68, and the cam follower 71 is constantly pressed in the direction of the second cam 65 by the spring 75. . Further, the first link member 7
A second link member 76 is attached to the lower end of the second member 2 so as to be rotatable about a support shaft 77.

A bearing portion 78 is formed in the lower case 61 so as to protrude therefrom. The rotating shaft 63 is rotatably supported by the bearing portion 78 and the wall surface on the opposite side of the case 61 in FIG. The lower operating arm 64 is integrally connected to a protruding end on the outer side of the rotary shaft 63, and the block body 80 rotatably connected to the second link member 76 and the support shaft 79 is a case. In the interior of the shaft 61, the shaft 61 is integrally connected to the rotation shaft 63.

The block 80 has a pin 8
A bracket 82 having an upright portion 1 is attached, and a spring 84 is stretched between the pin 81 and a pin 83 erected inside the case 61. The arm 64 is a support shaft 63
Is urged in the direction of arrow d, that is, the direction in which the weighing hopper 9 is closed.

Accordingly, when the cam 65 is rotated by the driving of the drive motor 95 and the lift of the cam follower 71 is increased, the first link member 72 swings in the direction of arrow e against the urging force of the spring 75. Accordingly, the block body 80 and the operation arm 64 swing in the direction of arrow c, ie, the direction in which the weighing hopper 9 is opened, against the urging force of the spring 84 via the second link member 76, and conversely, the cam follower When the lift amount of the first link member 72 decreases,
Swings in the direction of arrow f by the urging force of the spring 75, and the block body 80 and the operating arm 64
The urging force of 4 causes the hopper 9 to swing in the direction of arrow d, that is, the direction in which the weighing hopper 9 is closed. An elastic member 85 such as rubber is wound around the pin 74 protruding from the support 68, and the lower end of the first link member 72 swings in the direction of the arrow f when the first link member 72 swings in the direction of arrow f. The shock at the time of contact is reduced.

As described above, in the weighing device 1, the support table 5 is formed in the shape of a frustoconical cone having a downwardly tapered shape.
The upper case 41 is inclined toward the center of the support base 5 as the distance a becomes lower, and the upper case 41 attached to the inclined peripheral surface 5a.
Also, since the lower part thereof is inclined downward toward the center of the support base 5 as it goes downward, these surfaces are formed as normal vertical surfaces outside the inclined surfaces 5a and 41a. In such a case, a space A that cannot be generated is formed diagonally below the support base 5 or the upper case 41 toward the inside of the support base 5. Since the lower case 61 is disposed in the space A and the weighing hopper 9 is attached to the case 61, the weighing hopper 9 is positioned closer to the inner side of the support base 5. As a result, as shown in FIG. 2, the load cell 66 housed inside the support table 5 or its fixed rigid body 66a
And the horizontal distance L between the weighing hopper 9 disposed outside the support table 5 and the lowermost portion to which the object to be weighed is supplied does not become long, and a decrease in the frequency of the load cell 66 as a spring system is avoided. As a result, high-speed processing of the weighing device 1 becomes possible, and it is not necessary to increase the strength of the noise filter for cutting low-frequency noise and the like transmitted from the surroundings.

On the other hand, the drive motor 95, the two cams 45 and 65, the cam followers 46 and 71, the block body 47, and the first link member 7 are provided in the bulging portion 41b of the upper case 41.
2. Since the springs 51, 75 and the like are arranged in a compact manner, the swelling of the bulging portion 41b does not affect the arrangement position of the weighing hopper 9, and the weighing hopper 9 is mounted on the support base 5. Also, the user does not stay away from the load cell 66.

In particular, the first link member 72 and the second link member 76 for transmitting the driving force of the drive motor 95 disposed above to the lower operation arm 64 disposed below.
Are provided along the support 68 and the lower case 61, so that the elongate link members 72 and 76 prevent the weighing hopper 9 from moving away from the support base 5 or the load cell 66.

Further, a pool hopper 8 for supplying an object to be weighed to the weighing hopper 9 is provided with support brackets 42, 42 provided on a bulging portion 41b of the upper case 41 and bolts 42a.
, The inclined surfaces 5a, 4
By using the space A generated by the space 1a, the weighing hopper 9 is disposed closer to the support table 5 and is similarly disposed closer to the support table 5 so that the pool hopper 8 is directly connected to the weigher hopper 9. It will be located above.

[0040]

As described above, according to the present invention,
A main body side wall interposed between a spring-based load detecting means housed inside the main body and a weighing hopper connected to the detecting means via a support member and arranged outside the main body is inclined in a vertical direction. An opening / closing drive device for the weighing hopper is provided at a bulge formed on the main body side due to the inclination, and the support member protrudes into a space formed obliquely above or below the outside of the main body. When the weighing hopper is attached to the hopper, the hopper is not affected by the expansion of the main body,
The device is arranged outside the main body without moving away from the main body. As a result, the horizontal distance between the load detecting means and the weighing hopper or the supply position of the object to be weighed does not increase, thereby preventing the load detecting means from lowering the frequency and reducing the strength of the noise filter. There is no need to increase the strength, and high-speed weighing work can be performed.

According to the second aspect of the present invention, the transmission mechanism in the opening / closing drive mechanism for opening / closing the weighing hopper is provided along a support member projecting into a space formed obliquely above or below the outside of the main body due to the inclination of the main body side wall. As a result, the disposition of the transmission mechanism prevents the weighing hopper from being excessively moved away from the apparatus main body.

Furthermore, according to the third aspect of the present invention, a pool hopper for supplying an object to be weighed to the weighing hopper is disposed above the weighing hopper, and an opening / closing drive device for opening and closing the pool hopper is provided on the apparatus body side. In this case, since the drive device for the pool hopper is provided in the main body bulging portion, even if the degree of bulging of the bulging portion is large, it may affect the projecting position of the support member or the disposition position of the weighing hopper. Therefore, the distance between the load detecting means and the weighing hopper is kept short. Further, since the pool hopper is attached to the bulging portion, the pool hopper is disposed above the weighing hopper disposed near the main body by utilizing the space outside the main body generated by the inclination of the main body side wall. It is possible to do.

[Brief description of the drawings]

FIG. 1 is a schematic front view showing the overall configuration of a combination weighing type weighing device according to the present invention.

FIG. 2 is an enlarged view showing a hopper mounting portion in the weighing device.

FIG. 3 is a longitudinal sectional view of a hopper unit mainly showing an opening / closing drive mechanism of a pool hopper in the weighing device.

FIG. 4 is a longitudinal sectional view of a hopper unit mainly showing an opening / closing drive mechanism of a weighing hopper in the weighing device.

FIG. 5 is a schematic plan view showing an arrangement order of members around a drive motor in the opening / closing drive mechanism.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 weighing device 5 support base 5 a inclined peripheral surface 8 pool hopper 9 weighing hopper 41 upper case 41 a inclined surface 41 b bulging portion 44 upper operation arm 45 first cam 46 cam follower 47 block body 61 lower case 64 lower operation arm 65 second Cam 66 Load cell 66a Fixed rigid body 66b Movable rigid body 68 Support 71 Cam follower 72 First link member 76 Second link member 80 Block body 95 Drive motor A space

Claims (3)

[Claims] 1. A load detecting means which is housed in an apparatus main body, is deformed by a load applied thereto, and detects the load based on the amount of the deformation, and is connected to the load detecting means and extends between the inside and outside of the apparatus main body. A supporting member extending outside the main body of the apparatus and connected to the load detecting means via the supporting member so that the weight of the supplied object is measured by the load detecting means and A weighing hopper having a gate for discharging the weighed material, wherein an opening / closing drive device for opening and closing the gate of the weighing hopper is provided on an apparatus main body side, and the load detecting means and the weighing hopper are combined. The side wall of the main body, which is separated from the inside and outside of the main body, is inclined in the vertical direction, and the opening / closing drive device is housed in a bulge formed on the main body side due to the inclination of the main body side wall, and The weighing device, wherein the support member protrudes into a space formed obliquely above or below. 2. The opening / closing drive device includes a driving source, a transmission mechanism for transmitting a driving force of the driving source, and an operating member driven by the driving force transmitted by the transmission mechanism to open and close the weighing hopper. The weighing device according to claim 1, wherein the transmission mechanism is provided along a support member. 3. A pool hopper for supplying an object to be weighed to the weighing hopper is disposed above the weighing hopper, and an opening / closing drive device for opening and closing the pool hopper is accommodated in a bulging portion formed on the main body side. The weighing device according to claim 1, wherein a pool hopper is attached to the bulging portion.