JPS6394122A - Weight checker - Google Patents

Abstract

PURPOSE:To perform accurate weighing operation within a limited time and to inspect all of even mass-produced articles at low cost by incorporating a weighing sensor integrally as part of a packing machine and eliminate the problem of installation space, and receiving the articles by a buffer bar and placing them gently. CONSTITUTION:Inspection is carried out as to whether the weight of an article packed by a longitudinal pillow packing machine is within the permissible range of a set weight value or not. In this case, the weighing sensor 14 is incorporated integrally as part of the packing machine P and the problem of the installation space, etc., is eliminated. For the purpose, bodies which are weighed and packed, and cut and fallen bag by bag are received by the buffer bar 11 to absorb their shock, and they are mounted on a weighing bar 12 gently and further lowered and stopped. The weight is measured by the sensor 14 after the bar 12 is stabilized to decide whether or not the weight is excessive or deficient, and the articles are scooped up by a takeout bar 13 positioned below them and mounted on a conveyor 10. Then a scraper, etc., are operated by the storage part of the control part of the sensor 14 to reject defectives on the way to a next process.

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention compares the set weight of the measuring device with the actual weight of the food in order to ensure the accuracy of weighing products that are measured with a measuring device and packaged with a packaging machine.
This article concerns a weight checker used to keep the excess and deficiency within an acceptable range.

(Prior art) Foods, confectionery, etc. that are produced and sold in large quantities are offered to consumers based on price or weight as a sales unit. It is important to set the weight for each product and match it accurately to the set value, but it is not possible to make all the products to be weighed, which vary in unit weight, exactly the same. It is difficult to obtain the set value or a weight value as close to it as possible (from the conventional weighing system, which weighs the set weight with one weighing machine, to dividing the product to about 10 weighing scales and supplying the weight value accordingly). Efforts have been made to more accurately measure the weight of objects to be weighed using combination weighing devices that obtain the weight of objects by performing combinational calculations using electronic calculators.

(Problem to be solved by the invention) As described above, accurate weight values can be obtained by improving the weighing device, but the weighing device itself detects the weight value with various weight detection sensors when it receives the object to be weighed. However, since the combination calculation is repeated and the objects to be weighed that are the objects of the combination are fed to the next process, for example, a packaging machine, mechanical operations and
In addition, electrical signals are exchanged, switches are turned on and off, etc. at a rate of several tens of times per minute depending on the number of measurements, and although the design of each part of the weighing device and the parts used are sufficiently reliable, sometimes mechanical Malfunctions, electrical errors, etc. can cause under-doses, putting consumers at a disadvantage, and over-dosing can also impair productivity on the manufacturer's side.

The indicated weight and actual weight of a product are regulated based on the Measurement Act, and in order to ensure accuracy, a method of re-weighing the weighed item is taken, and various weight checkers are provided, but the conventional sampling check is gradually changing. There is a shift towards full quantity checking.

In order to perform this weight check efficiently, a small conveyor with dimensions appropriate to the shape and physical properties of the object to be inspected is usually held by a weight detection sensor, and the weight is detected as it passes over the conveyor to determine whether it is too much or too little. The accuracy is mainly determined by the sensitivity of the weight detection sensor used, the speed of the small conveyor held above it, the method of transferring onto it, etc. The length of the conveyor is especially important, and the transfer device is This is a practical problem for snacks, etc., which are produced in large quantities and are packaged using vertical billow packaging machines. However, due to constraints such as the dimensions of the weight checker, the method of supplying it, and its price, it was not possible to check all the products.

(Means for Solving the Problems) The present invention eliminates the above-mentioned conventional problems and eliminates excess or deficiency in the quantity of pickled products to be packaged by checking the entire quantity beforehand, and without taking up any particular space in the packaging process. The built-in weight checker can be used as a part of the packaging machine without any impact on the packaging machine.The function of the weight checker is miniaturized and the packaged product to be weighed is placed in the weighing section of the weight checker at the time of weight check using a buffer bar. The receiver absorbs the shock during feeding and shortens the time required for stabilization, and once the weight is weighed and the weight check is completed, it is quickly sent to the next process by the take-out bar or take-out conveyor. This action is used to improve the progress of packaging. This is repeated for all the products to be packaged, and the weight is compared with the set weight value. Products that exceed the predetermined upper and lower limits are excluded, and only good products are considered final products.

(Function) Vertical billow type packaging machines usually perform one of the wrapping operations.
In each cycle, the packaged products fall downward from the top, are guided by a guide plate installed at that point, and are transferred to a conveyor that runs diagonally upward from the front lower part of the packaging machine, and is placed on a stage for the distribution process. Pole packing etc. will be carried out.

In order to check the weight between this guide plate and the conveyor salt, a weight checker is installed at the point where the product falls, and measuring bars for weight detection are arranged in several rows at a predetermined interval, and a part of the lower part is connected. It is supported by an arm and mounted on the weighing sensor of the weight checker.

A feeding device and a take-out device are installed between each of these weighing bars, and products in falling packaging tubes are first received by the feeding device that waits at a position slightly higher than the weighing bars, then lowered and then gently transferred to the weighing bars. Furthermore, it descends and stops at a position where no contact occurs during measurement and measurement errors do not occur.

Once the product has been transferred as described above and the shock of the transfer to the weighing sensor has subsided and the weight value has been measured, the weighing bar should be placed on the top of the weighing bar so as not to affect the weighing operation. A pick-up device waiting at a lower position transfers the items to the conveyor and sends them to the carton packaging process as described above. However, if the weight value exceeds the upper and lower limit set ranges as a result of the weight check, they are considered defective and are transferred to the conveyor. Remove with a pusher or compressed air.

(Example) Next, embodiments of the present invention will be described based on the drawings.

First Embodiment FIG. 1 is a perspective view showing the main parts of an embodiment in which a weight checker 1 according to the present invention is attached to a vertical billow packaging machine, and FIG. 2 shows an object to be weighed packaged by this weight checker 1. An explanatory diagram of the weight check operation, FIG. 3 is also a cross-sectional view taken along the arrow A-A', and the weighed object is weighed to a predetermined amount by a measuring device (not shown), and then wrapped in a roll-like package. The film 2 is inverted by a former 4 through a roller 6.5 to form a cylindrical shape along the outside of the cylinder 5, and the overlapped portions on both sides are heated by a vertical heater 6.
The tube is heat-sealed to form a cylindrical tube, the lower part of which is heat-sealed using a horizontal heater 7 to form a bottom, and then placed into the cylinder 5.

This operation is repeated by feeding the cylindrical tube-shaped packaging film 2 by the length of one bag by the film feeding belt 8 according to the weighing and packaging cycle, and the filled product is moved to a distant position whose upper part is indicated by the imaginary line. The waiting horizontal heater 7 is brought close to the bag, inserted, and heat-pressed and heat-sealed to seal it.The bottom of the bag to be filled next is also heat-sealed at the same time, and then the middle part of the horizontal heater 7 is sealed. The pre-installed cutter 9 is operated to separate each bag, and in preparation for the next packaging, the horizontal heater 7 returns to its previous position, and the film feed belt 8 feeds down the packaging film for one bag, and the film is wrapped again. Packaging continues by repeating the weighing and filling operation.

In this way, a predetermined amount of the object to be weighed is filled into the packaging film, sealed, and further cut into individual bags.In the past, the packaged object to be weighed falls onto a slide-like chute installed at the bottom, diagonally downward. It slides down on a curved surface facing forward, is transferred to a conveyor 10 that runs diagonally upward from a lower part provided at the front, and is sent to the next process, such as packing into corrugated pole cases.

Therefore, the weight value of the product should match the value set on the scale, but in reality it is not the same, and sometimes the scale malfunctions, and even if the product is weighed correctly, it may be lost during the packaging process. Because excess and deficiency may occur due to loose weight, a weight checker was installed after the conveyor 10 to exclude defective products, but in order to accurately check the weight, the weight checker must have sufficient performance and mechanism. However, the weight checker based on the present invention can be integrated into the packaging machine. It is.

That is, the weight checker 1 is installed in the area where the slide-like chute mentioned above was previously installed, and the
As shown in the figure, the buffer par 11, the measuring par 12, and the take-out par 13 are formed into fork shapes that face each other without interfering with each other,
The object to be weighed, which is weighed and packaged, separated into individual bags, and falls downward, is first received by the buffer par 11 and its impact is absorbed, and then an air cylinder or the like (not shown) is operated to lower it onto the weighing bar 12. It is transferred quietly, descends downward, and stops.

The weighing bar 12 measures the equivalent impact during transfer using the weighing sensor 1.
4 stably returns to the rear needle 1, and after determining whether the weight is excessive or insufficient, the take-out par 16, which was located below the top surface of the measuring bar 12, is moved by actuating the air cylinder 15 and moving in an arc with the shaft 16 as the fulcrum. The products on the weighing par 12 are scooped up and transferred to the conveyor 10.

Meanwhile, the center point of the object to be weighed moves from position A immediately after heat sealing to position 8 where each bag is cut and dropped and received by the waiting buffer bar 11.Then the buffer bar 11 descends and is weighed. The position transferred to the bar 12 is C, and the weight check is completed and the conveyor 10 is taken out at par 13.
D indicates the position in the middle of being transferred to the conveyor 10, and E indicates the position immediately after being transferred to the conveyor 10.

If the object to be weighed is transferred to the conveyor 10, it will be taken out par 1
3 returns to its old position, and in the meantime, the buffer bar 11 also returns to its original position, and in preparation for the next weight check, the above operations are repeated one after another for the objects to be weighed and packaged according to a predetermined cycle, and the weight check is carried out. Let's do it.

As a result, normal crystals are sent to the next process such as packing into cardboard cases, and defective products are transferred to the conveyor 10 during the process, for example, after which a memory device installed in the control section of the weighing sensor 14 activates a scraper (not shown). or by blowing out compressed air, etc.

FIG. 3 shows the relative positions of the buffer bar 11 and the take-out bar 13 at the time when the weight of the object to be weighed is measured on the weighing bar 12 shown in FIG. 2 a% a'.

[Second Embodiment] FIGS. 4 and 5 are explanatory side views showing a second embodiment of the present invention.

The packaged objects to be weighed, which have been weighed, packaged, and cut into individual bags, fall downward according to the packaging cycle in the same way as in the first embodiment, and the buffer bar 11 waits at a predetermined position above the weighing bar 12. After absorbing the impact, the buffer bar 11 operates the air cylinder 19 and the like in that state to descend, gently transfer the object to be weighed onto the weighing bar 12, and then descend further and stop.

The object to be weighed on the weighing bar 12 is weighed by its weighing sensor 1.
4 is stabilized, the weight is weighed to determine whether the weight is over or under, and when the determination is completed, the take-out conveyor 17 is moved from the position shown in FIG. Raise it to the position and stop.

This take-out conveyor 17 has a frame 20 shaped like a parallelogram, and in this embodiment, four round pulleys 22 are arranged so that the round rubber belt 21 is slightly higher than the upper surface of the frame 20.
The attached drive shaft 23 and driven shaft 24 are rotatably supported by bearings, and a round rubber belt 21 is attached to the opposing round pulley 22.
is applied, and a drive motor (not shown) rotates the drive shaft 25 on the fulcrum 18 side to keep the round rubber belt 21 running in the direction of the conveyor 10 at all times.

Therefore, the tip of the take-out conveyor 17 rises to the measuring bar 1.
When the position of the running round rubber belt 21 becomes higher than the upper surface of the belt 2, the product is sent toward the conveyor 10, and when finished, the air cylinder 19' is operated to return it to the old position.

The products transferred to the conveyor 10 are sent to the next process such as packing into cardboard cases, and in this process, defective products are excluded in the same way as in the first embodiment.
b/Buffer in the arrow view/<-11, measuring bar 12,
This figure shows the relative position of the take-out conveyor 17, and the center of the bag of this product is cut from position A where the product has been packaged and heat-sealed, and each bag is cut and falls onto the buffer par 11 shown in FIG. 4B. Once received, the shock is absorbed, and then the shock absorber <-11 is lowered and the measuring bar 12 shown in FIG.
The product is transferred to the top, weighed, and then taken out using the air cylinder 19' by raising the tip of the conveyor 17.
The round rubber belt 21 is lifted up from position C and travels, and then it is sequentially moved cyclically to position B on the conveyor 10 in accordance with the packaging cycle of the packaging machine, and weight checks are repeated.

The second embodiment has a slightly more complicated structure, but the packaging speed is faster than the first embodiment.
This is effective in cases where the return of the extraction using the circular arc movement method using the extraction bar shown in the embodiment cannot be completed in time.

〔Effect of the invention〕

As mentioned above, when using a weight checker to check whether the weight of the product packaged using the vertical pillow packaging machine according to the present invention falls within the allowable range for the set weight value, this method has conventionally been used. Rather than the standard structure of seed weight checkers, which is mounted on a weighing sensor and detects the weight value while the product passes on a small horizontally running conveyor, it is integrated as part of the packaging machine. This eliminates problems such as how to secure the installation space and how to arrange the product, and allows the measurement to be carried out after being received by the buffer bar, instead of being directly dropped onto the weighing bar and waiting until the weighing mechanism such as a load cell is stabilized. By quietly transferring the weight, the time required for stabilization is shortened, and accurate weighing can be performed within a limited time without complicating conventional work.This type of weight has a simple configuration. The checker is inexpensive to manufacture, and can be installed on all packaging machines used for products produced in large quantities, such as relatively low-priced snacks, to easily and reliably perform 100% inspection, which was previously difficult to do, at low cost. It has excellent effects such as being able to do things.

In addition, it is also possible to compare the weight value of the weighed product with the set weight value of the scale in use, and if there is an excess or deficiency, it is also possible to correct the set weight value of the scale based on the weight value from the weight checker. As a result, excellent effects such as the ability to measure and package products with higher accuracy can be obtained.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing the configuration of an embodiment of the present invention, Fig. 2 is a side explanatory view of the first embodiment of the invention, and Fig. 3 is Fig. 2A.
5 and 6 are side views of the second embodiment, and FIG. 7 is a view taken along arrows B to B' in FIG. 5. 1... Weight checker 11... Buffer bar 12... Measuring bar 13... Take-out bar 14... Weighing sensor 17... Take-out conveyor 20... Take-out conveyor frame 21... Round rubber belt 22...Round pulley A...Center position B after heat sealing of the object to be weighed...
Center position of the object to be weighed on the buffer bar C...Center position of the object to be weighed with the weighing bar D...Center position of the object to be weighed while being sent to the next process with the take-out bar E...On the conveyor Center position F of the object to be weighed transferred to...Center position P of the object to be weighed at the time of sending it out from the take-out conveyor to the next process...Packaging machine body

Claims (5)

[Claims] (1) A weight checker that detects the weight using a weighing mechanism in which a plurality of flat plate-shaped objects to be weighed holding parts arranged in parallel are mounted on a weighing sensor, once receives the object to be weighed and absorbs its impact. This weight checker is characterized in that a mechanism for transferring an object to a weighing mechanism after weighing and a mechanism for removing an object to be weighed from the weighing mechanism after weighing operate cyclically without interfering with each other to perform a weight check. (2) Claim 1, characterized in that the mechanism for transferring the object to be weighed onto the weighing mechanism and the mechanism for removing the object to be weighed from the weighing mechanism are opposed to each other and formed in a fork shape. Weight checker listed. (3) The weight checker according to claim 1, wherein the mechanism for removing the weighed object from the weighing mechanism is performed by running a plurality of endless transport belts. (4) The weight checker according to claim 1, wherein the weight checker is integrated into a packaging machine for packaging objects to be weighed, and performs the weight check in synchronization with the packaging cycle of the packaging machine. (5) The weight value of the object to be weighed detected by the weight checker is compared with the set weight value of the measuring instrument used to weigh the object, and electrically corrected based on the weight value detected by the weight checker. The weight checker according to claim 1, characterized in that the weight checker comprises a circuit that performs the following steps.