JP2004294192A - Combined weighing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a combined weighing machine which has simple structure, and efficiently conveys a substance to be weighed. <P>SOLUTION: When regular articles are ejected, a conveyer 31 moves in the direction of an arrow head I1. Consequently, an ejection end 31L of the conveyor 31 projects by a length Lc in the direction of the arrow head I1, from a side face on the side of the defective article ejection shoot Sy2 of a booster hopper 23F. When defective articles are ejected, the conveyor 31 moves in the direction of an arrow head I2. Consequently, the ejection end 31R of the conveyor 31 projects by the length Lc in the direction of the arrow head I2, from a side face on the side of the regular article ejection shoot Sy1 of a booster hopper 23A. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a combination weighing machine that can obtain an object to be weighed having a target weight by combining the weights of objects to be weighed supplied to a plurality of weighing units.
[0002]
[Prior art]
Conventionally, in the food industry, etc., a combination weighing machine has been used to obtain an object to be weighed having a predetermined weight. In a combination weighing machine, an object to be weighed is dispersed and supplied to a plurality of weighing units arranged in a linear or circular shape, and the weights of the objects to be weighed supplied to the plurality of weighing units are combined so that a predetermined weight of the weighing object is combined. A weighed object is obtained.
[0003]
FIG. 14 is a schematic diagram showing a configuration of a conventional combination weighing machine (see Patent Document 1).
[0004]
In the combination weighing machine 900 of FIG. 14, the supply hoppers 8A to 8N are arranged at equal intervals in the horizontal direction. Measuring hoppers 9A to 9N are provided below the supply hoppers 8A to 8N, and the supply hoppers 8A to 8N supply the objects to be measured to the respective measuring hoppers 9A to 9N. Each of the weighing hoppers 9A to 9N includes a weight detector (not shown) for measuring the weight of the object to be weighed.
[0005]
The supply hoppers 8A to 8N are provided with discharge gates 8a to 8n for supplying the objects to be weighed input from outside to the weighing hoppers 9A to 9N, and the weighing hoppers 9A to 9N are for discharging the supplied objects to be weighed. Discharge gates 9a to 9n are provided.
[0006]
Below the plurality of weighing hoppers 9A to 9N, a transport conveyor 90 for transporting the objects to be weighed is provided. Except for the discharge ends 90L and 90R of the conveyor 90, the central portion of the conveyor 90, the supply hoppers 8A to 8N, and the weighing hoppers 9A to 9N are arranged inside the casing 77. The discharge ends 90 </ b> L and 90 </ b> R of the conveyor 90 project from both side surfaces of the casing 77.
[0007]
In the upper part of each of the supply hoppers 8A to 8N arranged inside the casing 77, input ports 7A to 7N for the objects to be weighed are formed. Below the discharge end 90R of the transport conveyor 90, a non-defective product storage box 91 for storing a later-described normal product is disposed, and below the discharge end 90L of the transport conveyor 90, a defective product storage box for storing a defective product described later. 92 are arranged.
[0008]
When the objects to be weighed are put into each of the supply hoppers 8A to 8N via the inlets 7A to 7N, each of the supply hoppers 8A to 8N temporarily holds the objects to be weighed, and the discharge gates 8a to 8n are opened. As a result, the objects to be weighed are supplied to the weighing hoppers 9A to 9N. The weighing hoppers 9A to 9N weigh the objects supplied from the supply hoppers 8A to 8N.
[0009]
Based on the weighing values of the weighing hoppers 9A to 9N, a combination of the objects to be weighed in the weighing hoppers 9A to 9N having a target weight value (predetermined product weight) is selected. Thereafter, the object to be weighed is discharged from the weighing hopper selected from the weighing hoppers 9A to 9N. Hereinafter, the objects to be weighed discharged from the respective weighing hoppers as a result of the selection of the combination of the weighing hoppers 9A to 9N will be referred to as positive products.
[0010]
The positive products discharged from the weighing hoppers 9A to 9N fall onto the transport conveyor 90, and the dropped positive products are transported by the transport conveyor 90 in the direction of arrow X and stored in the non-defective product storage box 91.
[0011]
On the other hand, even when the target weight value cannot be obtained based on the weighing values of the weighing hoppers 9A to 9N, the weighing hoppers 9A to 9N discharge the objects to be weighed. Hereinafter, an object to be weighed discharged from the weighing hoppers 9A to 9N when the target weight value is not obtained is referred to as a defective product.
[0012]
Defective products discharged onto the conveyor 90 by the weighing hoppers 9A to 9N are conveyed by the conveyor 90 in the direction of arrow Y and stored in the defective product storage box 92.
[0013]
FIG. 15 is a schematic diagram showing a problem in a conventional combination weighing machine. The combination weighing machine shown in FIG. 15 includes weighing hoppers 9A to 9E, supply hoppers 8A to 8N, a conveyor 90, a good product storage box 91, and a defective product storage box 92.
[0014]
For example, when an object to be weighed is discharged from the weighing hopper 9A as a defective product, the object to be weighed discharged from the weighing hopper 9A falls onto the transport conveyor 90 and is scattered around.
[0015]
Here, the transport conveyor 90 transports the defective product in the direction of arrow Y and stores it in the defective product storage box 92. However, the weighed object scattered when the defective product is transported by the transport conveyor 90 may fall from the discharge end 90R to the non-defective product storage box 91 side. As a result, a defective product is mixed with the regular product stored in the non-defective product storage box 91.
[0016]
[Patent Document 1]
JP-A-6-137927
[0017]
[Problems to be solved by the invention]
Therefore, in order to prevent a defective product from dropping into the non-defective product storage box 91, a combination weighing machine that prevents the object to be weighed from falling due to scattering has been proposed.
[0018]
FIG. 16 is a schematic diagram for explaining a mechanism for preventing an object to be weighed from dropping into a non-defective product storage box when a defective product is transported. The combination weighing machine shown in FIG. 16 includes supply hoppers 8A to 8N, weighing hoppers 9A to 9E, a conveyor 90, a good product storage box 91, and a defective product storage box 92.
[0019]
In FIG. 16A, the weighing hopper 9A is arranged on the most good item storage box 91 side of the plurality of weighing hoppers 9A to 9E, and the weighing hopper 9E is arranged on the most defective item storage box 92 side. The transport conveyor 90 located below the weighing hoppers 9A to 9E is longer than the non-defective product storage box 91 side of the weighing hopper 9A in the direction of the arrow X by a length Lc, and the side of the weighing hopper 9E on the defective product storage box 92 side. Is longer by a length Lc in the direction of arrow Y.
[0020]
According to the mechanism shown in FIG. 16A, the defective product discharged from the weighing hopper 9A is scattered on the conveyor 90, but the distance from the position where the defective product falls to the discharge end 90R is secured by the length Lc. Therefore, the defective product is prevented from dropping into the non-defective product storage box 91.
[0021]
Similarly, according to the mechanism shown in FIG. 16A, when the correct product is discharged from the weighing hopper 9E, the correct product is prevented from dropping into the defective product storage box 92.
[0022]
However, in this case, it is necessary to increase the length of the transport conveyor 90 itself. Therefore, the transport distance of the object to be weighed becomes long, and the operation efficiency of the combination weighing machine itself becomes poor.
[0023]
In FIG. 16B, a fall prevention shutter H is mounted above the discharge end 90 </ b> R of the conveyor 90. The upper end of the fall prevention shutter H is attached rotatably about a shaft Hp.
[0024]
The drop prevention shutter H is opened as shown by a broken line during the discharging operation of the correct amount product by the weighing hoppers 9A to 9E, and the lower end rotates in the direction of the arrow M during the discharging operation of the defective product, and It comes into contact with the belt and is closed.
[0025]
As a result, when the defective product is discharged from the weighing hopper 9A, the defective product discharged from the weighing hopper 9A is scattered on the conveyor 90. However, since the fall prevention shutter H is closed, the defective product is stored in the non-defective product storage box. It is prevented from dropping to 91.
[0026]
However, in this case, since the fall prevention shutter H comes into contact with the belt of the conveyor 90 during the discharging operation of the defective product, the durability of the fall prevention shutter H and the belt of the conveyor 90 is reduced. In particular, when dirt (adhering matter) generated by using the fall prevention shutter H is scraped off by the scraper Sc, the durability of the belt is significantly reduced.
[0027]
On the other hand, when the lower end of the fall prevention shutter H and the belt of the conveyor 90 are not to be brought into contact with each other, the distance between the fall prevention shutter H and the belt of the conveyor 90 needs to be adjusted. Handling becomes complicated.
[0028]
An object of the present invention is to provide a combination weighing machine having an easy configuration and capable of efficiently transporting an object to be weighed.
[0029]
It is another object of the present invention to provide a combination weighing machine having a configuration excellent in durability and capable of efficiently transporting an object to be weighed.
[0030]
[Means for Solving the Problems]
The combination weighing machine according to the first invention is disposed along one direction, and is provided below the plurality of weighing sections and the plurality of weighing sections for weighing the objects to be weighed, and is discharged from each of the plurality of weighing sections. Transport means for transporting the weighed object in one direction or the opposite direction and discharging it from one discharge end or the other discharge end, driving means for moving the transport means in one direction or the reverse direction, and transport of the transport means Control means for controlling the direction and controlling the moving direction of the transport means by the drive means based on the transport direction of the transport means.
[0031]
In the combination weighing machine according to the first invention, the objects to be weighed are weighed by the plurality of weighing units, and the objects to be weighed discharged from each of the plurality of weighing units are conveyed in one direction or the opposite direction by the transporting means. At the same time, the sheet is discharged from one discharge end or the other discharge end, and the transport means is moved in one direction or the opposite direction by the drive means. Further, the transport direction of the transport unit is controlled by the control unit, and the moving direction of the transport unit by the drive unit is controlled based on the transport direction of the transport unit.
[0032]
As described above, by moving the transport unit in one direction or the opposite direction, the objects to be weighed discharged from each of the plurality of weighing units are scattered on the transport unit and fall from the discharge end that should not be discharged. This can be prevented with an easy configuration.
[0033]
In addition, since the transport unit moves in one direction or the opposite direction, it is not necessary to increase the length of the transport unit itself, and the transport operation can be performed at a short distance when transporting the object to be weighed. Is efficient.
[0034]
Further, since it is not necessary to provide a fall prevention means such as a shutter in the transport means, there is no deterioration due to the contact of the transport means with the fall prevention means.
[0035]
The control unit may control the driving unit such that the transport unit moves in a direction opposite to the transport direction of the transport unit. In this case, the control unit controls the driving unit to move the transport unit in a direction opposite to the transport direction of the transport unit.
[0036]
This prevents the objects to be weighed discharged from the weighing section located in the direction opposite to the transport direction from being scattered on the transport means and falling from the discharge end that should not be discharged.
[0037]
The control means is configured such that, when the object to be weighed is conveyed in one direction by the conveyance means, the other discharge end of the conveyance means protrudes in a direction opposite to the measurement part on the other discharge end side of the plurality of measurement parts. When the transporting means is moved by the driving means and the object to be weighed is transported in the reverse direction by the transporting means, one of the discharge ends of the transporting means is in one direction from the weighing part on the one discharge end side of the plurality of weighing parts. The transporting means may be moved by the driving means so as to protrude at.
[0038]
In this case, when the object to be weighed is conveyed in one direction by the conveying means, the control means controls the driving means so that the other discharge end is higher than the weighing section on the other discharge end side of the plurality of weighing sections. The transport means is moved so as to project in the opposite direction. Further, when the object to be weighed is transported in the reverse direction by the transporting means, the control means controls the driving means so that one discharge end of the transporting means is connected to one of the plurality of weighing sections on one of the weighing sections. The transporting means is moved so as to project in one direction. This prevents the object to be weighed from being scattered on the transporting means and falling from the discharge end in the direction opposite to the transport direction.
[0039]
The transporting means may include a belt conveyor arranged to extend in one direction. In this case, the object to be weighed is conveyed by the belt conveyor and discharged from one or the other discharge end. Further, since there is no need to provide a means for preventing falling of the object to be weighed, deterioration of the belt due to contact between the means for preventing falling and the belt conveyor is prevented.
[0040]
The belt conveyor may have a length longer in one direction than a distance from a position on one discharge end side of the plurality of weighing units to a position on the other discharge end side. Thereby, the moving distance of the belt conveyor is shortened, and the efficiency of the combination weighing operation is improved.
[0041]
The combination weighing machine according to the second invention is arranged along one direction, and is provided below the plurality of weighing sections for weighing the objects to be weighed, and discharged from each of the plurality of weighing sections. Transport means for transporting the object to be weighed in one direction or the opposite direction and discharging it from one discharge end or the other discharge end, and a weighing device provided at one discharge end of the transport means and weighed from one discharge end. A discharge inhibiting means that can be switched between a first state in which the discharge of the object is prevented and a second state in which the object to be weighed is discharged from one of the discharge ends; Control means for controlling the first and second states of the discharge prevention means on the basis of the conveying direction of the means and the states of a predetermined number of the measurement sections on one of the discharge ends of the plurality of measurement sections. It is assumed that.
[0042]
In the combination weighing machine according to the second invention, the objects to be weighed are weighed by the plurality of weighing sections, and the objects to be weighed discharged from each of the plurality of weighing sections are conveyed in one direction or in the opposite direction by the conveying means. Is discharged from one discharge end or the other discharge end. Further, a first state in which discharge of the object to be weighed from one discharge end is prevented by the discharge prevention means and a second state in which discharge of the object to be weighed from one discharge end is permitted are switched. Further, the control unit controls the transport direction of the transport unit, and based on the transport direction of the transport unit and the state of a predetermined number of weighing units on one discharge end side of the plurality of weighing units, the first and the second discharge prevention units are controlled. The second state is controlled.
[0043]
As described above, by switching between the first state in which discharge of the object to be weighed is discharged from one discharge end and the second state in which discharge of the object to be weighed is permitted from one discharge end by the discharge prevention means, The object to be weighed discharged from each of the plurality of weighing units can be prevented from being scattered on the transport means and falling from one of the discharge ends.
[0044]
Further, since the time and the number of times that the discharge prevention means contacts the transport means are significantly reduced, deterioration of the durability of the transport means itself is prevented.
[0045]
Furthermore, since the length of the transporting means itself does not need to be increased and the transport operation can be performed at a short distance when transporting the object to be weighed, the efficiency of the combination weighing operation is high.
[0046]
The transporting means may be provided such that the other discharge end protrudes in a direction opposite to the measuring section on the other discharge end side of the plurality of measuring sections.
[0047]
This prevents the object to be weighed discharged from the weighing section on the other discharge end side from being scattered on the transport means and falling from the other discharge end.
[0048]
The control means may switch the discharge prevention means to the first state when the object to be weighed is conveyed in the reverse direction by the conveying means and the object to be weighed is discharged from any of the predetermined number of weighing units.
[0049]
In this case, when the object to be weighed is conveyed in the reverse direction by the conveying means and the object to be weighed is discharged from any of the predetermined number of weighing sections, the discharging means is controlled by the control means so that the object to be weighed is discharged from one of the discharge ends. The state is switched to the first state in which the discharge of the weighed object is prevented. This prevents the object to be weighed discharged from the weighing unit from being scattered on the transport means and falling from one discharge end.
[0050]
The control means may switch the discharge prevention means to the second state when the object to be weighed is conveyed in one direction by the conveyance means.
[0051]
In this case, when the object to be weighed is conveyed in one direction by the conveying means, the control means switches the discharge prevention means to the second state in which the discharge of the object to be weighed from one discharge end is permitted. This allows the object to be weighed discharged from the weighing section to be scattered on the transport means and fall from one discharge end.
[0052]
The conveying means is a belt conveyor arranged so as to extend in one direction, and the discharge preventing means is configured to prevent the object to be weighed on the belt conveyor from being discharged from one discharge end in the first state. It may include a shielding member which comes close to or in contact with the belt conveyor and is separated from the belt conveyor so that the object to be weighed on the belt conveyor is discharged from one discharge end in the second state.
[0053]
In this case, the object to be weighed on the belt conveyor is prevented from being discharged from one discharge end in the first state by the shielding member approaching or contacting the belt conveyor. Further, the object to be weighed on the belt conveyor is discharged from one discharge end in the second state by the separation of the shielding member from the belt conveyor.
[0054]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, a combination weighing machine according to an embodiment of the present invention will be described with reference to FIGS.
[0055]
(First Embodiment)
FIG. 1 is an external perspective view of the combination weighing machine according to the first embodiment, and FIG. 2 is a schematic front view of the combination weighing machine of FIG. FIG. 3 is a block diagram showing a configuration of the combination weighing machine of FIG.
[0056]
In the combination weighing machine 100 of FIG. 1, a product carrying-in section 10 is provided at an upper portion. A combination weighing unit 20 is provided below the product loading unit 10, and a product discharge unit 30 is provided below the combination weighing unit 20. A control device 40 is provided on the back side of the combination weighing unit 20. Above the product loading section 10, a setting input section 50 is supported by a column 50a connected to the side surface of the control device 40.
[0057]
The product loading section 10 includes a plurality of loading paths 10A (FIGS. 2 and 3). Each of the plurality of carry-in paths 10A includes an inlet 10a, a carry-in trough 10b, and a carry-in trough drive unit 10c (FIG. 3). A carry-in trough 10b and a carry-in trough drive unit 10c are provided below the inlet 10a, respectively. The carry-in trough drive unit 10c vibrates the carry-in trough 10b.
[0058]
The combination weighing unit 20 includes a plurality of weighing units 20A. Each of the plurality of weighing units 20A is composed of three types of hoppers arranged in order of a pool hopper 21, a weight hopper 22, and a booster hopper 23 from top to bottom. Each of the pool hopper 21, the weight hopper 22, and the booster hopper 23 has shutters 21a, 22a, 23a attached thereto as shown in FIG. 2, and also has opening / closing driving devices 21b, 22b, 23b (FIG. 3). . The weight hopper 22 further includes a weighing device 22c (FIG. 3).
[0059]
The shutters 21a to 23a hold the objects to be weighed supplied from above in the respective hoppers 21 to 23 in the state shown by the solid line in FIG. The shutters 21a to 23a rotate around the rotation axis P in the direction of arrow S. As a result, the objects to be weighed held in the respective hoppers 21 to 23 are discharged in the state shown by the broken line in FIG.
[0060]
The product discharge section 30 includes a positive quantity product discharge chute Sy1, a defective product discharge chute Sy2, a transport conveyor 31, a transport conveyor driving device 32 (FIG. 3), and a transport conveyor moving device 33 (FIG. 3).
[0061]
As shown in FIG. 2, a conveyor 31 is provided below the combination weighing section 20, a discharge chute Sy1 is provided below the discharge end 31R of the conveyor 31, and a discharge chute Sy1 is provided below the discharge end 31L. A defective product discharge chute Sy2 is provided.
[0062]
The transport conveyor 31 is supported by a conveyor support piece 33a. The conveyor support piece 33a is rotated by the conveyor moving device 33. Thereby, the conveyor 31 moves in a substantially horizontal direction with the operation of the conveyor support piece 33a. The belt Br of the conveyor 31 is rotated in the forward and reverse directions by the conveyor drive unit 32.
[0063]
3 includes a CPU (central processing unit) 41, a RAM (random access memory) 42, a ROM (read only memory) 43, and an external storage device 44. The ROM 43 stores a system program. The CPU 41 executes a combination weighing program described later stored in the external storage device 44 on the RAM 42 in advance.
[0064]
As a result, the CPU 41 controls the loading trough driving unit 10c of the product loading unit 10, the opening / closing driving devices 21b to 23b and the weighing device 22c of the combination weighing unit 20, and the transport conveyor driving device 32 and the transport conveyor moving device 33 of the product discharging unit 30. Control behavior.
[0065]
Next, an outline of the operation of the combination weighing machine 100 according to the present embodiment will be described with reference to FIG. At the time of combination weighing, the carry-in trough 10b in FIG. 2 vibrates in a predetermined direction, and the belt Br of the conveyor 31 rotates in a predetermined direction.
[0066]
When the objects are put into the plurality of carry-in entrances 10a by the user, the objects to be weighed fall onto the carry-in trough 10b, and are supplied to the respective weighing units 20A of the combination weighing unit 20 by the vibration of the carry-in trough 10b.
[0067]
In the weighing section 20A, the object to be weighed is supplied from the carry-in trough 10b into the pool hopper 21, and the object to be weighed is supplied to the weight hopper 22 by opening the shutter 21a of the pool hopper 21 at a predetermined timing.
[0068]
The weight hopper 22 weighs the object supplied from the pool hopper 21. When the shutter 22a of the weight hopper 22 is opened, the weighed object is supplied to the booster hopper 23.
[0069]
The booster hopper 23 temporarily holds the object to be weighed supplied from the weight hopper 22. When the shutter 23a of the booster hopper 23 is opened, the object to be weighed is discharged onto the transport conveyor 31 of the product discharge unit 30. The discharge of the objects to be weighed in the booster hopper 23 is performed based on the weighed values of the objects to be weighed by the plurality of weight hoppers 22.
[0070]
In the present embodiment, the target weight value of the object to be weighed (the weight of a predetermined product) is predetermined. Therefore, a combination of the weight hoppers 22 and the objects to be weighed in the booster hopper 23 having the target weight value is selected from the weighing results of the objects to be weighed by the plurality of weight hoppers 22. Thereby, the objects to be weighed are discharged from the selected hoppers. Hereinafter, an object to be weighed discharged from the booster hopper 23 as a result of the combination of the weight hopper 22 and the booster hopper 23 being selected is referred to as a positive product.
[0071]
On the other hand, even when a target weight value cannot be obtained based on the weight value of the object to be weighed by the weight hopper 22, the weight hopper 22 and the booster hopper 23 discharge the object to be weighed. Hereinafter, an object to be weighed discharged from the booster hopper 23 when the target weight value is not obtained is referred to as a defective product.
[0072]
In the product discharge section 30, the positive product discharged from the booster hopper 23 is transported by the transport conveyor 31, and discharged to the positive product discharge chute Sy1. The defective product discharged from the booster hopper 23 is transported by the transport conveyor 31 and discharged to the defective product discharge chute Sy2.
[0073]
The transport conveyor 31 moves to a predetermined position at the time of transporting the correct quantity product and at the time of transporting the defective product. The operation of moving the conveyor 31 will be described later.
[0074]
Details of the configuration and operation of the conveyor 31 will be described with reference to FIG. FIG. 4 is a schematic diagram showing details of the configuration and operation of the conveyor 31 and the conveyor moving device 33 of the combination weighing machine according to the present embodiment.
[0075]
As shown in FIG. 4A, the transport conveyor 31 includes a conveyor frame Cf on a side surface thereof. The end β of the conveyor support piece 33a attached to the conveyor moving device 33 is rotatably attached to the conveyor frame Cf.
[0076]
FIG. 4B is a schematic side view of the transport conveyor moving device 33 of FIG. 4A viewed from the direction of the arrow Ta, and FIG. 4C is a transport conveyor moving device of FIG. FIG. 33 is a schematic front view when viewing the device 33 from the direction of arrow Tb.
[0077]
The transport conveyor moving device 33 includes a casing 33d and a motor 33d. A motor 33b is provided inside the casing 33d. The rotating shaft 33c of the motor 33b projects outside the casing 33d, and the end a of the conveyor support piece 33a is attached to the tip of the rotating shaft 33c of the motor 33b.
[0078]
When the motor 33b is driven, the rotating shaft 33c rotates in the direction of the arrow Rm. When the rotation shaft 33c rotates, the end β of the conveyor support piece 33a rotates in the direction of the arrow Rr. Since the end portion β of the conveyor support piece 33a is rotatably attached to the conveyor frame Cf, the transport conveyor 31 moves in the directions of arrows I1 and I2 according to the rotation direction of the rotation shaft 33c of the motor 33b (see FIG. Go to)).
[0079]
In the present embodiment, the transport conveyor 31 moves in the direction of arrow I1 (direction toward the defective product discharge chute Sy2 in FIG. 2) during the transport of the correct amount product, and enters the state shown by the solid line in FIG. When a non-defective product is conveyed, the non-defective product moves in the direction of arrow I2 (the direction toward the positive product discharge chute Sy1 in FIG. 2), and the state shown by the broken line in FIG.
[0080]
FIG. 5 is a schematic diagram for explaining the positional relationship between the conveyor 31 and the booster hopper 23 of the combination weighing machine according to the first embodiment. In FIG. 5, in order to identify each of the plurality of booster hoppers 23 in FIG. 2, reference numerals "23A" to "23F" are assigned to them from the positive product discharge chute Sy1 side to the defective product discharge chute Sy2 side. I have. Also, for ease of explanation, only the plurality of booster hoppers 23A to 23F, the transport conveyor 31, the positive quantity discharge chute Sy1 and the defective discharge chute Sy2 are schematically shown.
[0081]
FIG. 5 (a) shows the positional relationship between the booster hoppers 23A to 23F and the conveyor 31 when the regular product is discharged to the regular product discharge chute Sy1 (hereinafter, referred to as the regular product discharge). I have. At the time of discharging the positive quantity product, the transport conveyor 31 is moving in the direction of the arrow I1. As a result, the discharge end 31L of the conveyor 31 projects from the side surface of the booster hopper 23F on the side of the defective product discharge chute Sy2 by the length Lc in the direction of the arrow I1.
[0082]
In this case, when the positive quantity product is discharged from the booster hopper 23F, the positive quantity product falls on the conveyor 31 and is scattered around the same, but the positive quantity is moved by the movement of the conveyor 31 in the direction of the arrow I1. Since the distance from the falling position of the product to the discharge end 31L is ensured to be longer by the length Lc, it is possible to prevent the scattered positive product from dropping on the defective product discharge chute Sy2.
[0083]
Thus, the positive product is reliably discharged to the positive product discharge chute Sy1 by rotating the belt Br in the direction of the arrow X without falling to the defective product discharge chute Sy2 at the time of discharging the positive product.
[0084]
Hereinafter, the direction of the arrow X that is the rotation direction of the belt Br at the time of discharging the positive quantity product is referred to as the positive direction.
[0085]
FIG. 5B shows the positional relationship between the booster hoppers 23A to 23F and the conveyor 31 when a defective product is discharged to the defective product discharge chute Sy2 (hereinafter, referred to as a "defective product discharge"). At the time of rejection of defective products, the conveyor 31 is moving in the direction of arrow I2. As a result, the discharge end 31R of the conveyor 31 protrudes from the side surface of the booster hopper 23A on the positive product discharge chute Sy1 side by the length Lc in the direction of arrow I2.
[0086]
In this case, when the defective product is discharged from the booster hopper 23A, the defective product falls onto the conveyor 31 and is scattered around the conveyor 31. However, the defective conveyor is moved in the direction of the arrow I2 to drop the defective product. Since the distance from the position to the discharge end 31R is longer by the length Lc, it is possible to prevent the scattered defective product from dropping on the positive product discharge chute Sy1.
[0087]
As a result, the defective product is reliably discharged to the defective product discharge chute Sy2 by rotating the belt Br in the direction of the arrow Y without falling to the positive product discharge chute Sy1 when discharging the defective product.
[0088]
Hereinafter, the direction of the arrow Y that is the rotation direction of the belt Br at the time of discharging defective products is referred to as a defective direction.
[0089]
In the present embodiment, the combination weighing operation of the combination weighing machine 100 is performed based on a combination weighing program stored in the external storage device 44 of the control device 40. 6 to 8 are flowcharts showing a combination weighing program of the combination weighing machine according to the present embodiment.
[0090]
First, the control device 40 of the combination weighing machine 100 vibrates the carry-in trough 10b, moves the conveyor 31 toward the defective product discharge chute Sy2, and rotates the belt Br of the conveyor 31 in the positive direction (step S101). ).
[0091]
Subsequently, the control device 40 supplies the objects to be weighed from the pool hoppers 21 to the respective weight hoppers 22 and causes the weight hoppers 22 to weigh the objects to be weighed (Step S102). Therefore, the control device 40 determines whether or not the target weight value has been obtained from the combination of the weighing values of the objects to be weighed obtained from the respective weight hoppers 22 (step S103).
[0092]
In step S <b> 102, the weight hopper 22 may supply the measured object to the booster hopper 23 and measure the object to be newly supplied from the pool hopper 21. In this case, when calculating the combination of the target weight values, the control device 40 can also target the objects to be weighed in the booster hopper 23 to be combined.
[0093]
Whether the target weight value is obtained from the combination of the plurality of weighing values is determined by whether the combination of the plurality of weighing values falls within a predetermined error range with respect to the target weight value. Is determined.
[0094]
When the target weight value is not obtained from the combination of the weighing values, the control device 40 determines whether the weighing value is outside the measurement range of the weight hopper 22 (overscale) or the weighing object overflows from the weight hopper 22. It is determined whether there is an overflow (overflow) (step S104). If it is not overscale or overflow, control device 40 repeats the operation of step S102. On the other hand, in the case of overscale or overflow, the control device 40 performs a defective product discharging process described later (step S105), and thereafter repeats the operation of step S102.
[0095]
In step S103, when the target weight value is obtained from the combination of the weighing values, the control device 40 performs a later-described positive-quantity product discharging process (step S201). After the correct product discharge processing, the control device 40 determines whether or not the production schedule has been completed (step S202). If the production schedule has not been completed, the operation of step S102 is repeated.
[0096]
On the other hand, when the production schedule is completed, the control device 40 sends all the objects to be weighed from all the loading troughs 10b, the pool hopper 21, the weight hopper 22, and the booster hopper 23 to the defective product discharge chute Sy2 via the conveyor 31. It is discharged (step S205).
[0097]
Next, the defective product discharging process in step S105 in FIG. 6 will be described with reference to FIG.
[0098]
At the time of the defective product discharging process, the control device 40 determines whether or not the rotation direction of the belt Br of the transport conveyor 31 is the positive direction (step S301). When the belt Br of the conveyor 31 is rotating in the positive direction, the controller 40 moves the conveyor 31 to the positive product discharge chute Sy1 and rotates the belt Br of the conveyor 31 in the defective direction ( Step S302).
[0099]
Therefore, the control device 40 identifies each hopper in which the overscale or the overflow is recognized, and discharges the weighed object in each identified hopper onto the transport conveyor 31 (step S303).
[0100]
Then, the control device 40 causes the transport conveyor 31 to discharge the objects to be weighed discharged from each hopper to the defective product discharge chute Sy2 (step S304). If the rotation direction of the belt Br of the conveyor 31 is not the positive direction in step S301, the control device 40 performs the operation of step S303.
[0101]
Next, a description will be given, with reference to FIG. 8, of the positive quantity product discharging process in step S201 of FIG.
[0102]
At the time of the positive quantity product discharging process, the control device 40 determines whether or not the rotation direction of the belt Br of the conveyor 31 is the positive quantity direction (step S401). If the rotation direction of the belt Br of the conveyor 31 is not the positive direction, the controller 40 moves the conveyor 31 toward the defective product discharge chute Sy2, and rotates the belt Br of the conveyor 31 in the positive direction (step). S402).
[0103]
Therefore, the control device 40 identifies each hopper from the obtained combination of the target weight values, and discharges the objects to be weighed in the identified hoppers onto the conveyor 31 (step S403).
[0104]
Then, the control device 40 causes the transport conveyor 31 to discharge the objects to be weighed discharged from the respective hoppers to the positive quantity discharge chute Sy1 (step S404). In step S401, when the rotation direction of the belt Br of the conveyor 31 is the positive direction, the control device 40 performs the operation of step S403.
[0105]
As described above, the combination weighing machine 100 according to the first embodiment has been described. However, as a moving means of the conveyor 31, instead of the conveyor moving device 33 and the conveyor support piece 33 a, an air cylinder drive shown in FIG. 9 is used. The device 70 and the air cylinder 72 may be used.
[0106]
FIG. 9 is a schematic view showing a transfer means of the transfer conveyor which can be replaced in the first embodiment. In this case, the conveyor frame Cf of the conveyor 31 is supported by the piston of the air cylinder 72, and the cylinder of the air cylinder 72 is fixed by the air cylinder driving device 70.
[0107]
The air cylinder driving device 70 supplies air to the cylinder portion and discharges air inside the cylinder portion. As a result, the piston moves in the directions of arrows I1 and I2. As a result, the conveyor 31 supported by the piston can also move in the directions of the arrows I1 and I2.
[0108]
In the combination weighing machine 100 according to the first embodiment, the transport conveyor 31 moves to a predetermined position between the time of transporting a correct quantity product and the time of transporting a defective product, so that the correctness of the defective product discharge chute Sy2 is adjusted. The mass product is prevented from dropping, and the defective product is prevented from dropping onto the positive product discharge chute Sy1. Therefore, the combination weighing machine 100 has a simple configuration because it is not necessary to provide the conveyor 31 with a fall prevention means such as a shutter.
[0109]
Further, since it is not necessary to provide a fall prevention unit such as a shutter on the conveyor 31, there is no deterioration of the belt Br due to the contact between the shutter and the belt Br of the conveyor 31.
[0110]
Further, since it is not necessary to increase the length of the transport conveyor 31 itself, and the transport operation can be performed at a short distance when transporting the correct quantity product and the defective product, the efficiency of the combination weighing operation is high.
[0111]
(Second embodiment)
The combination weighing machine 100 according to the second embodiment has the same configuration and operation as the combination weighing machine 100 according to the first embodiment except for the following points.
[0112]
FIG. 10 is a schematic diagram illustrating the transport conveyor 31 and the fall prevention shutter H provided in the combination weighing machine according to the second embodiment. The combination weighing machine according to the second embodiment is different from the combination weighing machine 100 according to the first embodiment in that, instead of the transport conveyor moving device 33 (FIG. 4) and the conveyor support piece 33a (FIG. 4), a fall prevention device is provided. A shutter H, a rotation axis J, a shutter driving device 80, and a scraper Sc are provided.
[0113]
In FIG. 10, a drop prevention shutter H is provided above the discharge end 31R of the conveyor 31 and a scraper Sc is provided below the conveyor 31 near the belt Br. The scraper Sc is for scraping off dirt (adhering matter) on the belt Br.
[0114]
The upper end of the fall prevention shutter H is attached to a rotation shaft J protruding from the shutter driving device 80. A motor such as a stepping motor is provided in the shutter driving device 80, similarly to the transport conveyor moving device 33 of the first embodiment.
The rotation axis J is a rotation axis of a motor provided in the shutter driving device 80.
[0115]
The rotation axis J rotates in the forward and reverse directions of the arrow N by the shutter driving device 80. Thus, the lower end of the fall prevention shutter H swings in the direction of the arrow M.
[0116]
In the second embodiment, the state in which the lower end of the fall prevention shutter H swings in the direction of arrow M to come into contact with the belt Br of the conveyor 31 (the state shown by the solid line in FIG. 10) is set as the fall prevention shutter. H is closed, and the state in which the belt is separated from the belt Br of the conveyor 31 (the state shown by the broken line in FIG. 10) is called that the fall prevention shutter is opened. The fall prevention shutter H performs an opening / closing operation in accordance with the rotation direction of the belt Br of the conveyor 31 (the direction of the arrow X and the arrow Y) and the position of the booster hopper 23 that discharges the object to be weighed.
[0117]
In the above example, when the fall prevention shutter H is closed, the fall prevention shutter H comes into contact with the belt Br of the conveyor 31. However, the object to be scattered on the belt Br is scattered in a predetermined direction. If it can be prevented, the fall prevention shutter H does not necessarily need to contact the belt Br of the conveyor 31.
[0118]
FIG. 11 is a schematic diagram for explaining the opening / closing operation of the fall prevention shutter of the combination weighing device according to the second embodiment. In FIG. 11, in order to identify each of the plurality of booster hoppers 23 in FIG. 2, reference numerals "23A" to "23F" are assigned from the positive quantity discharge chute Sy1 to the unnecessary quantity discharge chute Sy2. I have. Also, for ease of explanation, only the plurality of booster hoppers 23A to 23F, the conveyor 31, the fall prevention shutter H, the positive quantity product discharge chute Sy1, and the defective product discharge chute Sy2 are schematically shown.
[0119]
In the present embodiment, the length of the transport conveyor 31 in the transport direction of the objects to be weighed is the same as the length of the transport conveyor 31 of the combination weighing device 100 according to the first embodiment. In FIG. 11, the discharge end 31L of the conveyor 31 is disposed so as to protrude by a length Lc from the side surface of the booster hopper 23F on the side of the defective product discharge chute Sy2.
[0120]
In the following description, as in the first embodiment, the combination of the weight hopper 22 and the booster hopper 23 shown in FIG. The object to be weighed is called a positive product, and the object to be weighed discharged from the booster hopper 23 when the target weight value is not obtained is called a defective product. In addition, the time when a positive product is discharged to the positive product discharge chute Sy1 is referred to as a positive product discharge, and the time when a defective product is discharged to the defective product discharge chute Sy2 is referred to as a defective product discharge.
[0121]
FIG. 11A shows an operation state of the fall prevention shutter H when a correct product is discharged from the booster hopper 23A. At the time of discharging the positive product, the fall prevention shutter H is always open even when the positive product is discharged from any of the booster hoppers 23A to 23F.
[0122]
In this case, the object to be weighed discharged from the booster hopper 23A as a positive product falls onto the conveyor 31 and is scattered. As a result, the positive product may fall from the discharge end 31R, but even if it falls, the positive product is discharged to the positive product discharge chute Sy1.
[0123]
On the other hand, when an object to be weighed is discharged from the booster hopper 23F as a positive product, the positive product falls onto the transport conveyor 31 and is scattered around the conveyor, but from the drop position of the positive product to the discharge end 31L. The conveyor 31 is set so that the distance between the hoppers is equal to the length Lc, so that the scattered positive products are prevented from dropping on the defective product discharge chute Sy2.
[0124]
In this way, at the time of discharging the positive quantity product, even if the fall prevention shutter H is always open, the positive quantity product does not fall to the defective product discharge chute Sy2 and the belt Br rotates in the direction of the arrow X to ensure the positive quantity product. Is discharged to the positive quantity discharge chute Sy1 side.
[0125]
Hereinafter, the direction of the arrow X that is the rotation direction of the belt Br at the time of discharging the positive quantity product is referred to as the positive direction.
[0126]
On the other hand, FIG. 11B shows an operation state of the fall prevention shutter H when a defective product is discharged from the booster hopper 23A. When discharging a defective product, the fall prevention shutter H is closed only when the defective product is discharged from the booster hopper 23A.
[0127]
In this case, when the object to be weighed is discharged from the booster hopper 23A as a defective product, the defective product falls on the conveyor 31 and is scattered around the conveyor 31. However, since the fall prevention shutter H is closed, the defective product is removed. It is prevented from dropping from the discharge end 31R of the transport conveyor 31 to the positive quantity product discharge chute Sy1.
[0128]
Accordingly, when the defective product is discharged from the booster hopper 23A, the defective product is reliably discharged to the defective product discharge chute Sy2 by rotating the belt Br in the direction of the arrow Y without falling to the positive product discharge chute Sy2. Is done.
[0129]
Hereinafter, the direction of the arrow Y that is the rotation direction of the belt Br at the time of discharging defective products is referred to as a defective direction.
[0130]
Note that the fall prevention shutter H is always open even when a defective product is discharged from any of the booster hoppers 23B to 23F. The conveyor 31 is arranged such that the distance from the falling position of the defective product from the booster hopper 23B located on the positive product discharge chute Sy1 side next to the booster hopper 23A to the discharge end 31R is the length Ld. Therefore, even if a defective product is discharged from the booster hopper 23B, the defective product that has fallen and been scattered does not fall on the positive product discharge chute Sy1.
[0131]
Thereby, the fall prevention shutter H does not need to be always closed. Therefore, the contamination (adhering matter) of the object to be weighed, which is generated on the belt Br of the conveyor 31 by closing the fall prevention shutter H, is reduced. As a result, the contact of the scraper Sc with the belt Br is reduced.
[0132]
Further, since the closing time of the fall prevention shutter H can be shortened, the friction between the fall prevention shutter H and the belt Br is reduced, and the durability of the belt Br is ensured.
[0133]
In the present embodiment, the fall prevention shutter H closes only when a defective product is discharged from one booster hopper 23 located closest to the positive product discharge chute Sy1. However, when there is a possibility that other defective products discharged from the booster hopper 23 may fall into the positive product discharge chute Sy1, the fall prevention shutter H may cause the defective products to drop into the positive product discharge chute Sy1. It may be closed when a defective product is discharged from a certain booster hopper 23. For example, control may be performed such that the fall prevention shutter H is closed when defective products are discharged from any of the plurality of booster hoppers 23 near the positive product discharge chute Sy1.
[0134]
In the present embodiment, the combination weighing operation of the combination weighing device 100 is performed based on a combination weighing program stored in the external storage device 44 (FIG. 3) of the control device 40 (FIG. 3). Note that the combination weighing program according to the present embodiment is the same as the combination weighing program according to the first embodiment shown in FIG. 6, but the processing contents of the defective product discharge processing and the correct quantity product discharge processing are different. .
[0135]
Hereinafter, a defective product discharging process and a positive product discharging process of the combination weighing program according to the second embodiment will be described.
[0136]
FIG. 12 is a flowchart illustrating a defective product discharging process of the combination weighing device according to the second embodiment.
[0137]
At the time of the defective product discharging process, the control device 40 determines whether the rotation direction of the belt Br of the transport conveyor 31 is the positive direction (step S501). When the belt Br of the conveyor 31 is rotating in the positive direction, the controller 40 rotates the belt Br of the conveyor 31 in the defective direction (step S502).
[0138]
Therefore, the control device 40 identifies each hopper in which overscale or overflow has been recognized (step S503), and determines whether or not the booster hopper 23A closest to the positive quantity discharge chute Sy1 has been identified (step S504).
[0139]
When the booster hopper 23A on the side of the most positive product discharge chute Sy1 is not identified, the control device 40 discharges the objects to be weighed in the identified hoppers onto the transport conveyor 31 and discharges the defective product discharge chute Sy2. (Step S505).
[0140]
If the rotation direction of the belt Br of the conveyor 31 is not the positive direction in step S501, the control device 40 performs the operation of step S503.
[0141]
If the booster hopper 23A on the side of the most positive product discharge chute Sy1 is identified in step S504, the control device 40 closes the fall prevention shutter H and moves the objects to be weighed in the identified hoppers onto the conveyor 31. Then, it is discharged to the defective product discharge chute Sy2 (step S506). Thereafter, the control device 40 opens the fall prevention shutter H with the lapse of a predetermined time (step S507).
[0142]
FIG. 13 is a flowchart illustrating the process of discharging the positive product of the combination weighing device according to the second embodiment.
[0143]
At the time of the correct quantity product discharging process, the control device 40 determines whether or not the rotation direction of the belt Br of the conveyor 31 is the correct quantity direction (step S601). When the rotation direction of the belt Br of the conveyor 31 is not the positive direction, the control device 40 rotates the belt Br of the conveyor 31 in the positive direction (step S602).
[0144]
Therefore, the control device 40 identifies each hopper from the obtained combination of the target weight values, and discharges the objects to be weighed in the identified hoppers onto the conveyor 31 (step S603).
[0145]
Then, the control device 40 causes the transport conveyor 31 to discharge the objects to be weighed discharged from the respective hoppers to the positive product discharge chute Sy1 (step S604). If the rotation direction of the belt Br of the conveyor 31 is the positive direction in step S601, the control device 40 performs the operation of step S603.
[0146]
In the combination weighing device 100 according to the second embodiment, the fall prevention shutter H provided above the discharge end 31R of the transport conveyor 31 is in the defective product discharging process, and the most accurate product discharging chute Sy1 is used. It is closed only when the object to be weighed is discharged from the booster hopper 23A on the side. This prevents the defective product from dropping onto the positive product discharge chute Sy1.
[0147]
In addition, since it is not necessary to increase the length of the transport conveyor 31 itself, and the transport operation can be performed at a short distance when transporting a correct quantity product and a defective product, the efficiency of the combination weighing operation is high.
[0148]
Further, since the time and the number of times that the lower end of the fall prevention shutter H contacts the belt Br of the conveyor 31 are significantly reduced, the durability of the belt Br itself of the conveyor 31 is prevented from deteriorating.
[0149]
As described above, in the first and second embodiments, the weighing unit 20A corresponds to the weighing unit, the transport conveyor 31 corresponds to the transport unit and the belt conveyor, the transport conveyor moving device 33, the conveyor support piece 33a, and the air cylinder. The driving device 70 and the air cylinder 72 correspond to driving means, the control device 40 corresponds to control means, and the discharge ends 31L and 31R correspond to discharge ends. Further, the shutter driving device 80, the rotation axis J and the fall prevention shutter H correspond to a discharge prevention unit, the fall prevention shutter H corresponds to a shielding member, and a state in which the fall prevention shutter H is closed corresponds to a first state. The state in which the fall prevention shutter H is open corresponds to a second state.
[0150]
【The invention's effect】
In the combination weighing machine according to the present invention, the objects to be weighed are weighed by the plurality of weighing units, and the objects to be weighed discharged from each of the plurality of weighing units are conveyed in one direction or the opposite direction by the conveying means. Is discharged from the discharge end or the other discharge end, and the transport means is moved in one direction or the opposite direction by the drive means. Further, the transport direction of the transport unit is controlled by the control unit, and the moving direction of the transport unit by the drive unit is controlled based on the transport direction of the transport unit.
[0151]
As described above, by moving the transport unit in one direction or the opposite direction, the objects to be weighed discharged from each of the plurality of weighing units are scattered on the transport unit and fall from the discharge end that should not be discharged. This can be prevented with an easy configuration.
[0152]
In addition, since the transport unit moves in one direction or the opposite direction, it is not necessary to increase the length of the transport unit itself, and the transport operation can be performed at a short distance when transporting the object to be weighed. Is efficient.
[0153]
Further, since it is not necessary to provide a fall prevention means such as a shutter in the transport means, there is no deterioration due to the contact of the transport means with the fall prevention means.
[Brief description of the drawings]
FIG. 1 is an external perspective view of a combination weighing machine according to a first embodiment.
FIG. 2 is a schematic front view of the combination weighing machine of FIG.
FIG. 3 is a block diagram showing a configuration of the combination weighing machine of FIG.
FIG. 4 is a schematic diagram showing details of the configuration and operation of a conveyor and a conveyor moving device of the combination weighing machine according to the present embodiment.
FIG. 5 is a schematic diagram for explaining a positional relationship between a conveyor and a booster hopper of the combination weighing machine according to the first embodiment.
FIG. 6 is a flowchart showing a combination weighing program of the combination weighing machine according to the present embodiment.
FIG. 7 is a flowchart showing a combination weighing program of the combination weighing machine according to the present embodiment.
FIG. 8 is a flowchart showing a combination weighing program of the combination weighing machine according to the present embodiment.
FIG. 9 is a schematic view showing a transfer means of a transfer conveyor which can be replaced in the first embodiment.
FIG. 10 is a schematic diagram illustrating a transport conveyor and a fall prevention shutter included in a combination weighing machine according to a second embodiment.
FIG. 11 is a schematic diagram for explaining an opening / closing operation of a fall prevention shutter of the combination weighing device according to the second embodiment.
FIG. 12 is a flowchart illustrating a defective product discharging process of the combination weighing device according to the second embodiment.
FIG. 13 is a flowchart showing a positive product discharging process of the combination weighing machine according to the second embodiment.
FIG. 14 is a schematic diagram showing a configuration of a conventional combination weighing machine.
FIG. 15 is a schematic diagram showing problems in a conventional combination weighing machine.
FIG. 16 is a schematic diagram for explaining a mechanism for preventing an object to be weighed from dropping into a non-defective product storage box when a defective product is transported.
[Explanation of symbols]
20A measuring section
31 Conveyor
31L, 31R Discharge end
33 Conveyor moving device
33a Conveyor support strip
40 control device
70 Air cylinder drive
72 Air cylinder
80 Shutter drive
H Fall prevention shutter
J rotation axis

Claims (10)

A plurality of weighing units arranged along one direction and weighing the objects to be weighed,
Conveying means provided below the plurality of weighing units and configured to convey the objects to be weighed discharged from each of the plurality of weighing units in the one direction or the opposite direction and discharge the weighed objects from one discharge end or the other discharge end. When,
Driving means for moving the transport means in the one direction or the reverse direction,
A combination weighing machine comprising: a control unit that controls a transfer direction of the transfer unit and controls a movement direction of the transfer unit by the driving unit based on the transfer direction of the transfer unit. 2. The combination weighing machine according to claim 1, wherein the control unit controls the driving unit such that the transport unit moves in a direction opposite to a transport direction of the transport unit. 3. The control means may be configured such that, when the object to be weighed is conveyed in the one direction by the conveyance means, the other discharge end of the conveyance means is higher than the weighing section on the other discharge end side of the plurality of weighing sections. When the transporting means is moved by the driving means so as to protrude in the reverse direction, and the object to be weighed is transported in the reverse direction by the transporting means, the one discharge end of the transporting means is provided with the plurality of weighing objects. The combination weighing machine according to claim 2, wherein the driving means moves the transport means so as to protrude in the one direction from the weighing part on the one discharge end side of the parts. The combination weighing machine according to any one of claims 1 to 3, wherein the transporting means includes a belt conveyor arranged to extend in the one direction. 5. The belt conveyor according to claim 4, wherein a length of the plurality of weighing units in the one direction is longer than a distance from a position on the one discharge end side to a position on the other discharge end side. The combination weigher as described. A plurality of weighing units arranged along one direction and weighing the objects to be weighed,
Conveying means provided below the plurality of weighing units and configured to convey the objects to be weighed discharged from each of the plurality of weighing units in the one direction or the opposite direction and discharge the weighed objects from one discharge end or the other discharge end. When,
A first state provided at the one discharge end of the transport means for preventing discharge of the object from the one discharge end, and a second state for permitting discharge of the object from the one discharge end Discharge prevention means switchable to the state of
Controlling the transport direction of the transport means, and controlling the transport direction of the transport means and the state of the predetermined number of the plurality of weighing sections on the one discharge end side of the plurality of weighing sections; Control means for controlling the second state. 7. The transporting means according to claim 6, wherein the other discharge end is provided such that the other discharge end protrudes in the opposite direction from a measurement part on the other discharge end side of the plurality of measurement parts. Combination weighing machine. The control unit causes the transport unit to transport the object to be measured in the reverse direction, and when the object to be weighed is discharged from any of the predetermined number of weighing units, sets the discharge preventing unit to the first state. The combination weighing machine according to claim 6, wherein the combination weighing machine is switched to: 9. The apparatus according to claim 6, wherein the control unit switches the discharge prevention unit to the second state when the object to be weighed is conveyed in the one direction by the conveyance unit. Combination weighing machine. The conveying means is a belt conveyor arranged to extend in the one direction,
The discharge preventing means is close to or in contact with the belt conveyor so as to prevent the object to be weighed on the belt conveyor from being discharged from the one discharge end in the first state, and the second state The combination weighing machine according to any one of claims 6 to 9, further comprising a shielding member that is separated from the belt conveyor so that the object to be weighed on the belt conveyor is discharged from the one discharge end. .

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