JPS63294B2 - - Google Patents

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention is a weighing and pricing packaging device, specifically, it automatically packs products after weighing them, and then affixes a label with required printing to the packaged products. Regarding equipment.

(Prior art) JP-A-54-123391 discloses an apparatus shown in FIG. 5, in which a weighing conveyor 51 is installed on the product feed path side of a packaging section A that automatically packages product a. At the same time, the product is weighed one by one on the weighing conveyor 51.
A supply conveyor 52 for transporting the products upward and a carry-in conveyor 53 for transporting the products on the weighing conveyor 51 to the packaging section A are installed, and a label printing and pasting device 54 is installed on the output side.

In this conventional device, a product transferred to a weighing conveyor 51 is weighed while passing through the conveyor 51, is carried to a packaging section A via a carry-in conveyor 53, and in the packaging section A, packaging material is automatically wrapped around a product a. , the packaged product a is carried out from the packaging section A by the carry-out conveyor 55, and is carried out by the heater conveyor 56.
Then, the label printing and pasting device 54 prints necessary data regarding the product on a label, and the label is automatically pasted on the product a.

(Problems to be Solved by the Invention) In the conventional device described above, the product a is weighed while passing through the weighing conveyor 51, and while the weighed product a is being transferred on the carry-in conveyor 53, the photoelectric switch PS conveyor 5 when detected by ₁
The next product a from 0 is transferred onto the supply conveyor 52.

However, in the conventional apparatus, the weight of the product a is measured while it is being transferred while passing through the weighing conveyor 51, resulting in the following problems.

Since the measurement is carried out during transportation, the measured value is not stable.

For this purpose, we calculate the average value of the weighing data,
Alternatively, it is necessary to perform processing such as predicting a convergence value from the vibration waveform, which requires special data processing.

The measuring device becomes large because it requires a measuring surface as large as necessary to stabilize the vibration of the measuring device.

Since the initial load is applied to the entire conveyor mechanism, the initial load of the scale becomes large, requiring a large load cell and increasing the size of the scale.

If the transfer speed is slowed down, the weighing time becomes longer and the weighing accuracy improves, but the packaging processing capacity decreases.

Therefore, in a weighing and pricing packaging device, it is preferable to weigh the product while it is stationary on a scale rather than weighing it while it is being transported, and it has also been known in the past to weigh the product while it is stopped. ing.

However, the time required for the measuring operation of a measuring device is not necessarily constant depending on the product.

In other words, there are heavy items and light items to be weighed, and the maximum impact that the item receives on the scale is different, so the scale vibrates for a long time in some cases, and in others it does not, and the vibration stops. The measurement time is not constant because it is impossible to measure up to However, in order to be able to weigh any type of product, conventional equipment uses a timer to set the weighing time of the scale according to the product that requires the most time, and then starts the delivery conveyor after the time set on the timer has elapsed. It is set like this.

Therefore, the weighing process is completed in a short time.
In detail, for products whose weighing process is completed before the timer set time has elapsed, the carry-in conveyor will not start until the set time elapses, resulting in loss time, which causes a decrease in the work efficiency of the entire device. It is becoming.

In order to eliminate such conventional problems, the present invention provides a weighing and pricing device with high workability by performing the weighing operation, product supply, and carry-in operation without causing the loss time, thereby speeding up the device operation. It is.

(Means for Solving the Problems) The apparatus of the present invention includes a determining means for determining whether or not the weighing of the product transferred onto the weighing device is stable;
The apparatus is characterized by comprising a control means for synchronously starting the supply means and the carry-in conveyor when the determination means determines that the weighing is stable.

When a product is placed on the scale, the load cell's output signal (weight signal) waves and eventually converges, but inside the scale, the output signal is sampled at regular intervals and A/ Apply to D converter,
The measurement stability judgment means checks whether the output value matches the previously taken data, and the output value is stable when both data match or when both data are within a certain fluctuation range. (or when the data match three times in a row, or when three consecutive pieces of data fall within a certain variation range), an output signal is generated. This output signal is called a measurement stability signal or a measurement completion signal.

(Function) The product transferred to the weighing machine and held still is weighed by the weighing machine, and in synchronization with the stable measurement of the weighing machine, the supply means and the carry-in conveyor are started. The weighed product on the top is transferred to the packaging section and wrapped in a predetermined manner, and a new product is transferred onto the weighing device depending on the activation of the supply means.

(Example) To explain an example of the present invention with reference to the drawings, the first example is as follows.
In the figure and Fig. 2, A is the packaging section, B is the product storage section, C is the measuring device, D is the label printing and pasting device, and E is the label printing and pasting device.
1 is a console section, 1 is a product supply conveyor, 2 is a product carry-in conveyor, 3 is a product carry-out conveyor, and a is a product.

Packaging section A is a section that automatically wraps product a using packaging materials such as stretch film, and its specific structure is well known and will not be described here. A front product storage section B, a weighing device C, a console section E, a supply conveyor 1, and a carry-in conveyor 2 are arranged on the side (the right side in the figure), and the carry-out conveyor 3 and the label printing applicator D are arranged on the exit side (right side in the figure). Arrange.

The packaging section A outputs a packaging completion signal R every time the packaging operation is completed.

The storage section B is constructed by, for example, installing a stopper 12 at the transfer end of a free roller conveyor 11 which is constructed by connecting freely rotating free rollers in an endless chain, and stores the products a, a transferred by the conveyor 11.
... are stored in a continuous state starting from the stopper 12 position.

In the storage section B, the terminal end of the conveyor 11 is disposed perpendicular to the starting end of the carry-in conveyor 2, and the supply conveyor 1 is disposed across both conveyors 11 and 2 at the orthogonal section. This supply conveyor 1 constitutes a supply means.

The supply conveyor 1 is a belt conveyor having a pusher 1' and is driven intermittently by a motor _M1 , and this conveyor 1 sequentially transports the products a in the front row on the storage section B one by one to the starting end of the carry-in conveyor 2. Let them be transferred.

The free roller conveyor 11 of the storage section B may be arranged in series extending in the same direction as the carry-in conveyor 2, and in that case, the stopper 12 is made vertically movable so as to appear and retract from the conveyor intermittently. In this configuration, the free roller conveyor 11 and the stopper constitute the supply means.

The weighing device C is an electronic scale, and is installed on the starting end of the carry-in conveyor 2 with a weighing pan slightly protruding, and the supply conveyor 1 supplies each product a onto the weighing pan. Do it like this.

The weighing device C is connected to the console section E and outputs and transmits the weight data of the weighed product and the above-mentioned weighing stability signal P to the central processing unit cup of the console section E when the weighing operation becomes stable.

The carry-in conveyor 2 is a conveyor with a pusher that transfers the product a from the scale C to the packaging section A.
It is driven intermittently by motor _M2 .

The carry-out conveyor 3 is a conveyor such as a belt conveyor that carries out the automatically wrapped product a in the packaging section A, and rotates intermittently or continuously.

The console part E has a built-in central processing unit (CPU), a numeric keypad 21, and a function key 2.
2. It has an input operation section 20 such as a changeover switch 23 and a display section 30, and when the changeover switch 23 is set to the setting mode, the number of products a to be weighed, processing date, product name, unit price, product code The central processing unit cpu is made to store and hold necessary data regarding the product a such as the number, the switch 23 is set to the operation mode, and the start button 22' of the function key 22 is pressed.
By pressing , the data is sent to the label printing and pasting device D. Also, the above start button 2
The motor _M1 of the supply conveyor 1 is started when 2' is pressed. Further, the central processing unit CPU of the console section E receives the packaging completion signal R output from the packaging section A and the weighing stability signal P output from the weighing device C, and sends start signals Q ₁ and Q ₂ to the supply conveyors 1 and 1, respectively. The motor _M1 of the supply conveyor 1 and the motor _M2 of the carry-in conveyor 2 output to the carry-in conveyor 2.
are activated to perform one conveyance operation each time, and the price data is arithmetic-processed based on the weight data transmitted together with the weighing stability signal P, and both data are output to the label printing and pasting device D.

Label printing applicator D prints each of the above-mentioned data of the product transmitted via the central processing unit CPU on the label,
When the corresponding product a is transported to a predetermined position by the carry-out conveyor 3, the label is attached to the product a.

Note that 40 in the figure is a product detector that determines the timing of label attachment.

The operation of the embodiment apparatus will be explained below with reference to the flowchart shown in FIG. First, after inputting the necessary data for the product a using the input operation section 20 of the console section E, the start button 22' is pressed to start the operation of the apparatus.S1, the motor _M1 of the supply conveyor 1 is started. supply conveyor 1
In step S2, the product a is carried onto the weighing device C by the activation of the step S2. As a result, the weighing device C starts weighing the product a (S3), and the weighing stability determining means checks whether the weighing operation has become stable (S4). When determining that the weighing is stable, the scale C outputs a weighing stability signal P.
Output.

The central processing unit CPU monitors whether or not the weighing device C outputs the weighing stability signal P, and when it confirms that the weighing stability signal P is output, it then checks whether the packaging section A is in the process of packaging. S5 to be inspected. This test is performed by checking whether the packaging section A has already outputted the packaging completion signal R. If the packaging completion signal R has not been output yet, the process waits until it is output. If it is determined that the packaging department A is not in operation or that the work has been completed, the central processing unit CPU outputs a start signal _Q2 to start the motor _M2 of the loading conveyor 2, and also outputs a start signal _Q1 . output and start the motor _M1 of the supply conveyor 1.

By starting the motor _M2 , the product a on the scale is carried into the packaging section A in step S6. Further, by starting the motor _M1 , the next product a is carried onto the weighing machine C in step S2, and then the above-described process is repeated.

The product a delivered to the packaging department A is packaged in the package A at S7. On the other hand, the data sent by the central processing unit CPU is printed on a label in the label printing/applying device D, and the packaged product is transferred to the unloading conveyor 3 at S8. When the product a is detected by the detector 40 while the product a is being transferred, the applicator D affixes the label after a certain period of time from Sa, S10, and the received product a is transferred to the carry-out conveyor 40 and the discharge conveyor connected thereto. S is carried out to a predetermined position by
11.

In the case of the above embodiment, the measuring instrument C was provided with a measuring stability determining means and the measuring stability signal P was supplied to the central processing unit CPU, but the measuring instrument C was equipped with a measuring stability determining means. Alternatively, the metering signal may be omitted, and the metering signal may be supplied from the measuring instrument C to the central processing unit CPU, and the central processing unit CPU may determine whether or not this metering signal has become stable.

(Effects) According to the present invention, even if the product is lightweight or the weighing time is long or short, the next packaging process and new product feeding operation can be started after a certain period of time from the output of the weighing stability signal, and the weighing instrument Compared to conventional equipment, which uses a timer to set the weighing time according to the product that requires the most time, there is no waiting time (loss time) from one weighing operation to the next, even if the product is light or requires a short weighing time. It is possible to increase the conveyance speed up to the section, thereby increasing the speed of the entire apparatus.

[Brief explanation of the drawing]

1 is a side view of the device of the present invention, FIG. 2 is a plan view thereof, FIG. 3 is a block diagram, FIG. 4 is a flowchart of the operation of the device, and FIG. 5 is a schematic side view of the conventional device. In the figure, A is the packaging section, C is the measuring device, D is the label printing and pasting device, 1 is the supply conveyor, 2 is the carry-in conveyor, 3 is the carry-out conveyor, M ₁ and M ₂ are the motors, P is the weighing stability signal, and Q ₁ and _Q2 are starting signals for motors _M1 and _M2 .

Claims (1)

[Claims] 1. A measuring device is installed on the product inlet path side of the packaging department where products are automatically packaged, and a supply means that transfers the products one by one onto the weighing device and a carry-in conveyor that transfers the products on the weighing device to the packaging department are installed intermittently. In a weighing and pricing device that is installed so that it can be started and stopped freely and has a label printing and pasting device installed on the output side, a determining means for determining whether or not the weighing of the product transferred onto the weighing device is stable; A weighing and pricing device comprising: control means for synchronously starting the supply means and the carry-in conveyor when it is determined that weighing is stable.