JPH08285664A - Weight checker - Google Patents

Abstract

PURPOSE: To execute high-speed and high-accuracy weight check for micro- weight goods such as a pack of flakes of dried bonito, or the outline of which is round and easy to roll, for example, cylindrical goods. CONSTITUTION: Goods 2 to be weight-checked are sent to a first inclined chute 3 to be slipped into a mooring hopper 4 installed in a stepped part between the first inclined chute 3 and a second inclined chute 5. The mooring hopper 4 is supported in such a manner as to be suspended from a weight detector 9, and takes opening and closing gates 12, 13 supported to open to both sides intersecting perpendicularly to the throw-in direction of goods 2 as a bottom plate. On the completion of detecting the weight of the goods slipped into the mooring hopper 4, the opening and closing gates 12, 13 are opened to discharge the goods 2 to the second inclined chute 5 disposed just under the mooring hopper 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a weight checker for checking the content of packed products,
In particular, the present invention relates to a product having a flat shape such as a bonito shavings pack, or a product suitable for checking a product having a round outer shape and easily rolling.

[0002]

2. Description of the Related Art A weight checker for checking products on a production line and allocating products having an accurate content is used in order to save labor and to reduce costs by improving yield. As the line configuration, the combination weighing device measures a predetermined weight of the object to be weighed,
Weigh the weighed objects into the packaging machine installed in the next stage in a predetermined amount and pack them into bags.The packed products are sequentially transported to the automatic cartoning machine and put into the cardboard case assembled by the box making machine. They are packed in boxes and carried out, and a weight checker is installed in the transport path from the packing machine to the automatic boxing machine.

Usually, the above-mentioned line transport path is composed of a belt conveyor driven in the horizontal direction. The weight checker also takes in the goods to be checked, the conveyor section that serves as the weighing pan, the weighing conveyor section, and the goods that have been weighed and checked to the next-stage automatic sorter. It is configured with a sending conveyor section that performs the taking in of goods from the take-in conveyor and transporting them to the weighing conveyor, and the weight of the goods is weighed at the weighing conveyor to determine whether or not the product is the correct quantity, and the next stage The delivery conveyor section sorts overweight items or light items.

[0004]

As described above, when a weight check is performed while transferring a product using a belt conveyor driven in the horizontal direction as a transfer path, if the product has a certain weight and a large shape. Even if the transportation speed of the goods is increased, the goods can be smoothly transferred on the line. However, if the product itself has a very small weight and a flat shape, such as a bonito shavings pack, if the driving speed of this belt conveyor becomes fast, it will hinder horizontal conveyance, so a weight check of this product will be performed. There was a problem that I could not do it. Further, for example, in the case of a cylindrical product that easily rolls, there is a problem in that the conveyance and measurement on the belt conveyor may be hindered.

That is, when a lightweight, flat-shaped product is conveyed by a high-speed belt conveyor, buoyancy acts on the product itself to make the conveyance posture unstable, and thus, at the boundary portion between the intake conveyor and the weighing conveyor described above. There was a problem that the transfer was not performed smoothly, and in some cases, the product was skipped and dropped outside the transportation path. Further, even products that are easy to roll and are not stable are not suitable for conveyance and weighing on a belt conveyor, and it has been impossible to perform high-speed and highly accurate weight check on such non-compatible products.

Therefore, the present invention is to carry out a weight check at a high speed and with high accuracy for a minute heavy product such as a bonito shavings pack or a product having a rounded outer shape and easily rolling, for example, a cylindrical product. The purpose is to provide a weight checker that can

[0007]

The weight checker according to claim 1 is a weight checker for checking whether or not the weight of a product is within an allowable range, and the weight checker is configured to incline the conveyance path of the product and The first slanted conveying path is separated from the slanted conveying path and the second slanted conveying path, and a step is provided to the first slanted conveying path to install the second slanted conveying path.
Weight detection for receiving and mooring the goods sent from the first inclined conveyance path at the stepped portion where the inclined conveyance path and the second inclined conveyance path are separated, and performing a weight check of the moored goods. It is characterized in that a mooring hopper attached to the means is provided, and an opening / closing bottom plate for dropping and discharging the product is provided at the inner bottom of the mooring hopper to a second inclined transport path arranged immediately below the mooring hopper.

A weight checker according to a second aspect of the present invention is the weight checker according to the first aspect, wherein the plate surface of the opening / closing bottom plate of the mooring hopper is formed to be a gentle slope with respect to the slope angle of the first inclined transport path. are doing.

A weight checker according to a third aspect of the present invention is the weight checker according to the first or second aspect, wherein defective product eliminating means that operates according to the output of the weight detecting means is provided in the second inclined conveyance path. .

[0010]

According to the structure of claim 1, when the product to be weight-checked is sent to the first slanted conveying path, the product slides down the first slanted conveying path, and the first slanted conveying path and the second slanted conveying path. It is sent to the mooring hopper installed at the step of the inclined transport path. Since the mooring hopper itself is attached to the weight detecting means, the weight of the product once moored in the mooring hopper is immediately detected. When the weight detection is completed, by opening the opening / closing bottom plate of the mooring hopper, it is possible to immediately send the product to the second inclined conveyance path arranged immediately below the mooring hopper. In this way, because the product is transported along a path that follows a natural fall, the course is not removed, especially for flat lightweight products that are not suitable for transport on a belt conveyor, or products that are easily rolled into a cylindrical shape. It can be transported smoothly and can handle high-speed weighing.

According to the second aspect of the invention, since the plate surface of the opening / closing bottom plate in the mooring hopper is formed so as to be a gentle inclined surface with respect to the inclination angle of the first inclined conveyance path, the product is the first. When the product is sent from the inclined conveyance path 1 to the mooring hopper, the product is landed on the opening / closing bottom plate of the mooring hopper without giving a shock in the aerial posture in which the product is thrown into the air. For this reason, the transfer of goods to the mooring hopper becomes smooth,
In addition, the goods are not dumped in the mooring hopper, and the weighing can be performed immediately.

According to the third aspect of the present invention, since the defective product removing means that operates by the output of the weight detecting means is provided in the second inclined conveying path, the product once moored in the mooring hopper. If it is determined that the product is not a regular product as a result of the weight detection, the product sent to the second inclined transport path is discharged to the outside of the transport path by the defective product removing unit.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram schematically showing the configuration of a weight checker 1 which is an embodiment of the present invention. The weight checker 1 includes a first inclined chute (first inclined conveyance path) 3 into which a product 2 is fed, a mooring hopper 4 installed immediately below the first inclined chute 3 and directly below the mooring hopper 4. The second slanted chute (second slanted conveyance path) 5 arranged in the above is used as a basic element.

An upstream side of the first inclined chute 3 is provided with a chute for conveying the packed products 2 by weighing a predetermined amount of an object to be weighed by a weighing machine and a packaging machine (not shown). Further, above the first inclined chute 3 on the downstream side, a photoelectric switch 7 that detects that the product 2 has slipped down forms a machine frame 8 that forms the main body of the weight checker 1.
It is installed in.

The mooring hopper 4 is suspended by a weight detector 9 installed on the machine frame 8 so that the product 2 sliding down the first tilt chute 3 can be slid into the mooring hopper 4 by a first inclination. It is installed directly below the chute 3. FIG. 2 is a perspective view showing the structure of the mooring hopper 4. The mooring hopper 4 is supported around the pivots 10 and 11 so as to open to both side sides orthogonal to the loading direction of the product 2 and has an L-shaped cross section. Opening and closing gates 12 and 13 and opening and closing gates 12 and 13 of the pivot 1
0, 11 and bearing plates 14, 15 which are hingedly coupled and supported. Further, the bottom plate surfaces of the opening / closing gates 12 and 13 are formed so as to be gently inclined with respect to the inclination angle of the first inclined conveyance path 3.

A second inclined chute 5 is installed immediately below the opening / closing gates 12 and 13 of the mooring hopper 4. A flap 19 that is opened and closed by a flap opening / closing mechanism 18 (not shown) is provided in the slope of the second inclined chute 5. When the flap 19 serving as the defective product removing means is opened, the product 2 sliding down the second inclined chute 5 falls from the opening of the flap 19 and is stored in the defective product storage box 20 provided under the flap 19. It has become. On the downstream side of the second inclined chute 5, a conveyer conveyor 21 that conveys the product 2 slipped off the second inclined chute 5 to the next-stage automatic boxing machine is installed.

FIG. 3 is a block diagram showing the configuration of a control system for controlling the operation of each part of the above-described product transport path. The product passage detection signal from the photoelectric switch 7 and the weight detection signal from the load cell 9 centering on the controller 23. The drive of the gate opening / closing mechanism 24 and the flap opening / closing mechanism 18 is controlled based on the above. Timer 2 for controller 23
5 is built in, and operates when a product passage detection signal from the photoelectric switch 7 is input to the controller 23 so that a weight check timing is set.

FIG. 4 is a flow chart showing a procedure for performing weight check of the product 2 by the weight checker 1 configured as described above. The operation of the weight checker 1 will be described below with reference to this flowchart.

When the commodity 2 slides down the first inclined chute 3 and is inserted into the mooring hopper 4, the moment when the photoelectric switch 7 is inserted into the mooring hopper 4 is detected (step S).
1). The detection signal of the photoelectric switch 7 is the controller 23
When input to, the timer 25 operates (step S
2). In the timer 25, the time required for the product 2 to stand still in the mooring hopper 4 when the product 2 is loaded into the mooring hopper 4 is set. When the set time has elapsed in the timer 25 (step S3), the controller 23 reads the weight value output from the weight detector 9 to measure the weight of the product 2 (step S4).

When the weight measurement of the product 2 is completed, the controller 23 immediately outputs a drive command to the gate opening / closing mechanism 24, and the opening / closing gates 12 and 13 of the mooring hopper 4 are opened (step S5). When the opening / closing gates 12 and 13 are opened, the product 2 moored in the mooring hopper 4 is discharged to the second inclined chute 5 immediately below. At this time, the controller 23 outputs a drive command to the gate opening / closing mechanism 24 and determines whether or not the product 2 is a proper quantity product based on the measured weight value, and determines that the product 2 is an overweight product or a lightweight product. When the determination is made (step S6), the drive command is also output to the flap opening / closing mechanism 18.

The flap opening / closing mechanism 18 opens the flap 19 in response to the opening operation of the opening / closing gates 12 and 13 by the gate opening / closing mechanism 24 (step S7). When the flap 19 is opened, the product 2 discharged from the mooring hopper 4 to the second inclined chute 5 is put into the defective product storage box 20 through the opening opened by the flap 19. Controller 2
When it is determined that the product 3 is a normal quantity product, the flap 19 is not opened, and therefore the product 2 slides down the second inclined chute 5 and is sent to the transfer conveyor 21, and is transferred to the next-stage automatic cartoning machine.

Further, as described above, the weighing value is not stabilized by the influence of the disturbance only by the process of setting the time during which the product will be stationary by the timer, and when the weighing error occurs, the weighing value is stabilized. It is also possible to adopt a method of opening and closing the gate after waiting. That is, when it is detected that the product 2 has slipped down the first inclined chute 3 and has been put into the mooring hopper 4, the weight detector 9 immediately repeats weighing a plurality of times to measure the previous weighing value and the current weighing value. It is determined whether the difference between the values is within a predetermined constant value. In this way, while monitoring the weighing value, if the difference value is within a certain value, it can be considered that the weighing is stable. Therefore, after determining the stable state, open and close the opening / closing gates 12 and 13 of the mooring hopper 4. You can do this.

The method for detecting that the measured value is stable and the method by the timer may be used together depending on the characteristics of the product to be weight-checked.
It can be appropriately selected and implemented by the soft processing in.

According to the procedure described above, the products 2 are sequentially sent from the upstream side to the weight checker 1 to perform the weight check. This weight check product 2
However, even if the product itself has a very small weight and a flat shape, such as a product packed with lightweight materials such as bonito shavings, as described above, the product 2 can be conveyed in the weight checker 1. , The first inclined chute 3 through the mooring hopper 4 to the second inclined chute 5 in accordance with a natural fall path, and in particular, the bottom plate surface of the opening / closing gates 12 and 13 in the mooring hopper 4 is the first. Since it is formed so as to have a gentle slope with respect to the inclination angle of the inclined chute 3, the product 2 is sent into the mooring hopper 4 from the first inclined chute 3 and the product is thrown into the air. It lands on the bottom plates of the opening / closing gates 12 and 13 in the mooring hopper 4 without being impacted in the posture.

Further, the discharge from the mooring hopper 4 to the second inclined chute 5 is instantaneous and reliable because it is discharged to the second inclined chute 5 directly below the mooring hopper 4 by opening the opening / closing gates 12 and 13. The goods 2 can be transferred to. In this way, even for very small weight products, the transportation posture of the products themselves will be stable, and the transition at each boundary will be smoother, so that continuous product transportation can be reliably carried out, and Sliding time,
By adjusting the timing of weight measurement and the like in the mooring hopper 4, it is possible to perform high-speed and high-accuracy weighing.

In the above embodiment, as shown in FIG.
The bottom plate surfaces of the opening / closing gates 12 and 13 of the mooring hopper 4 are formed to be flat so as to be suitable for weight check of flat work such as bonito shavings pack, and as shown in the schematic front view of FIG. , Open / close gate 12,1
It is also possible to form the bottom plate ends of 3 in a mountain shape so that the cylindrical work 30 can be fed from the inclined chute 3 to the mooring hopper 4. Also in this case, as in the above case, the cylindrical work 30 can land on the bottom plate of the opening / closing gates 12 and 13 in the mooring hopper 4 without being impacted in the aerial posture that is thrown out into the air. It is possible to perform high-speed and high-accuracy weight check of products that are not suitable for conveyor conveyance and weighing.

[0027]

According to the weight checker of the present invention, since the goods to be weight-checked can be conveyed by a path conforming to the natural fall, smooth and reliable transfer at the boundary of the conveying path can be performed. In particular, even for flat lightweight products that are not suitable for transporting on a belt conveyor, cylindrical products that are easy to roll, etc., it is possible to transport smoothly without removing the course, high speed and high accuracy You can now do a weight check.

[Brief description of drawings]

FIG. 1 is a side view schematically showing a configuration of a weight checker that is an embodiment of the present invention.

FIG. 2 is a perspective view showing a configuration of a mooring hopper in the embodiment.

FIG. 3 is a block diagram showing the configuration of a control system that controls the operation of each part of the product transport path.

FIG. 4 is a flowchart showing a procedure for performing a weight check.

FIG. 5 is a schematic front view showing the structure of a mooring hopper in another embodiment.

[Explanation of symbols]

 1 Weight checker 2 Product 3 First tilt chute (first transfer path) 4 Mooring hopper 5 Second tilt chute (second transfer path) 7 Photoelectric switch 9 Weight detector 12,13 Open / close gate (open / close bottom plate) 19 flaps (means for eliminating defective products)

Claims (3)

[Claims] 1. A weight checker for checking whether or not the weight of a product is within an allowable range, the product conveying path is inclined to separate it into a first inclined conveying path and a second inclined conveying path. At the same time, a step is provided in the separating section with respect to the first inclined conveyance path to install a second inclined conveyance path, and a step portion where the first inclined conveyance path and the second inclined conveyance path are separated, A mooring hopper attached to a weight detecting means for receiving and mooring goods sent from the first inclined conveyance path and performing a weight check of the moored goods is provided, and an inner bottom of the mooring hopper is A weight checker provided with an opening / closing bottom plate for dropping and discharging a product on the second inclined conveyance path arranged immediately below the mooring hopper. 2. The weight checker according to claim 1, wherein a plate surface of the opening / closing bottom plate in the mooring hopper is formed so as to have a gentle inclined surface with respect to an inclination angle of the first inclined conveyance path. 3. A defective article removing means which operates by the output of the weight detecting means is provided in the second inclined conveying path.
Alternatively, the weight checker according to claim 2.