JPH054604A - Device for supplying at constant rate in automatic packer - Google Patents

Abstract

PURPOSE:To maintain the accuracy of weighing and free the packing of an oversupply exceeding a expected amount when all at once goods come surging in a large quantity. CONSTITUTION:At the forward end of and at light angles to a supply conveyor 1 a conveyor 2 for smaller quantities with a smaller breadth and a conveyor 3 for larger quantities with a larger breadth are run in parallel. When a large quantity of goods come surging all at once and their weight reaches 50% of the expected amount, the conveyor 3 for larger quantities is stopped and the supply is switched to one-conveyor transport by the conveyor 2 for smaller quantities so as to decrease the stream of goods to a low rate from an early point of time. When there is no such upsurge of goods, both the two conveyors 2, 3 for smaller and larger quantities are used until their weight reaches 90% of the expected amount.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic packaging machine for weighing articles such as fruits and vegetables by a constant weight and supplying the articles to packaging containers such as boxes and bags.

[0002]

2. Description of the Related Art Conventionally, as an automatic packaging machine of this type, a wide mass transport conveyor and a narrow small transport conveyor are arranged in parallel in a direction orthogonal to the end of the supply conveyor to provide a large transport conveyor and a small transport conveyor. It is known that a weight detection unit is provided at the end of the conveyor. This product is supplied to the weight detection unit by both the large-quantity conveyor and the small-quantity conveyor until the detection value of the weight detection unit reaches a predetermined value (for example, 90% of the scheduled value), and the detection value of the weight detection unit. When the value exceeds a predetermined value, the large-quantity conveyor is stopped and the small-quantity conveyor alone supplies up to 100% (a unit weight to be stored in the container, for example, 15 kg) in a small amount.
According to this conventional device, there is an advantage that a measurement error can be suppressed to be small.

[0003]

However, in the conventional device, the supply amount by the supply conveyor is not always constant, and when a large amount of articles such as fruits and vegetables are supplied at one time, the detection value of the weight detection unit is predetermined. Even if the large-scale conveyor is stopped and the supply is switched to only the small-quantity conveyor after reaching the value, the scheduled weighing value may have already been exceeded at the time of the switching operation, ensuring the weighing accuracy. There was a problem that it was difficult.

Therefore, the present invention has been made to solve this problem, and when a large amount of articles are concentrated at one time, it is possible to ensure the weighing accuracy without exceeding the planned weighing value and supplying. With the goal.

[0005]

In order to solve the above-mentioned problems, the constant quantity supply device in the automatic packaging machine of the present invention transfers the articles supplied by the supply conveyor to the small quantity conveyor and the large quantity conveyor, and In an automatic wrapping machine, in which an article is shared by a conveyor and supplied to a weight detector, and when the detected value reaches a predetermined first weight value, the supply is switched to only the small-quantity conveyor, A time measuring means for measuring an elapsed time after the start of weight detection, a weight discriminating means for discriminating whether or not the detection value of the weight detector has reached a predetermined second weight value, and the weight discriminating means has a predetermined first weight value. When it is determined that the weight value has reached 2 weight values, the count determination means determines whether or not the count value of the time counting means is below a predetermined value, and when the count value is below the predetermined value, the large amount Carrying Those comprising a supply control means for stopping the supply by a conveyor.

[0006]

In the present invention thus constructed, the time counting means starts counting in response to the start of detection by the weight detector. The weight discriminating means discriminates whether or not the detection value of the weight detector has reached a predetermined second weight value.

When the weight discriminating means discriminates that the predetermined second weight value has been reached, the counting discriminating means discriminates whether or not the count value of the timing means is below a predetermined value. As a result, when the amount of supply from the supply conveyor is below a predetermined value and concentrated at one time, the supply control means stops the supply by the large-quantity conveyor, so that the weight detector is slightly supplied by the small-quantity conveyor.

[0008]

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

In FIG. 2, reference numeral 1 denotes a supply conveyor for supplying the fruits and vegetables C to the weighing process, which is installed so as to be conveyed from the paper surface side in the figure toward the front side. A narrow small-quantity conveyor 2 (hereinafter referred to as "small conveyor 2") and a wide large-quantity conveyor 3 (hereinafter referred to as "large conveyor") are arranged in parallel in the left-right direction in the figure at right angles to the end of the supply conveyor 1. Arrange in a staircase pattern. The small conveyor 2 and the large conveyor 3 are separately driven by a motor (not shown) so as to freely rotate forward and backward.

At the end of the left side of each of the small conveyor 2 and the large conveyor 3, there is provided a gutter 7, and a discharge side of the gutter 7 is provided with
The box support 11 that should support the box A is rotatably attached to the machine frame 13. The box support 11 is formed by connecting a revolving arm 14, a bottom plate 15 and a pressing member 16 at right angles to each other, and the upper end of the revolving arm 14 is pivotally attached to the machine frame 13 by a pivot 14a. Below the box support 11, a weight sensor 9 is provided as a weight detecting means for detecting the weight of the articles in the box A.

A hydraulic cylinder 17 for raising and lowering the box support 11 is rotatably attached to the machine frame 13 by means of a pivot 17a, and the tips of rods 17b of these hydraulic cylinders 17 are connected to the intermediate portion of the swivel arm 14. To do. A roller conveyor 21 for carrying out the box A in which a certain amount of articles are packed is arranged at the lower rotation position of the box support 11. Accordingly, when the hydraulic cylinder 17 is operated to project, the box support 11 is swung by a predetermined angle and is maintained facing the discharge port of the trough 7, and when the hydraulic cylinder 17 is moved backward, the box support 11 is swung downward. And is placed on the roller conveyor 21.

Next, a block diagram of the electrical system of the embodiment thus constructed will be described with reference to FIG.

In the figure, reference numeral 21 denotes a control section having a timer function and controlling each section as described later, and the weight sensor 9 is connected to the input side thereof. On the output side of the control unit 21, motors 22 and 2 for driving the conveyors 1, 2 and 3, respectively.
3 and 24 are connected, and the solenoid 25 that drives the hydraulic cylinder 17 is connected.

Next, an example of the operation of this embodiment having such a configuration will be described with reference to FIG.

Now, the supply conveyor 1 is operated to supply, for example, fruits and vegetables C toward the small conveyor 2 and the large conveyor 3.

First, both the small conveyer 2 and the large conveyer 3 are operated so that the conveying direction is toward the box A side. Fruits and vegetables C on both conveyors 2 and 3 are dropped and stored in the box A through the flow gutter 7. Here, when the supply to the box A is started and the weight sensor 9 starts counting (S1), the timer of the control circuit 21 is started accordingly (S2). And
When the detection value of the weight sensor 9 (the weight value in the box A) reaches a predetermined value X (for example, 50% of the planned weighing value) such as 5 kg, at that time, the count value T of the timer falls below the predetermined value T1. It is determined whether or not there is (S4).

As a result, the count value T of the timer is the predetermined value T1.
When it is smaller, the control unit 21 determines that the supply of the fruits and vegetables C from the supply conveyor 1 is excessively concentrated, stops the operation of the large conveyor 3, and supplies to the box A only by the small conveyor 2. The supply is switched to (S5).

On the other hand, when the count value T of the timer exceeds the predetermined value T1, the control unit 21 determines that there is no excessive concentration of the fruits and vegetables C, and continues the supply by both conveyors 2 and 3. The detection value of the weight sensor 9 is the predetermined value Y.
When (for example, 90% of the planned value for measurement) is reached, the control unit stops the operation of the large conveyor 3 and switches the supply to the box A thereafter to the supply of dispensing by only the small conveyor 2.

After that, when the detection value of the weight sensor 9 reaches the planned weighing value (for example, 10 kg) (S7), the operation of the small conveyor 2 is stopped (S8), and the supply to the box A is completed.
When the hydraulic cylinder 17 moves backward, the box support 1
1 rotates downward, and the box A is placed on the roller conveyor 21 and carried out.

As described above, in the present embodiment, when the supply of articles from the supply conveyor 1 is concentrated at once, the weight is immediately reduced from the time when the weight reaches a predetermined value X (50% of the planned measurement value). Since the supply is switched to only the conveyor 2 and the small amount is supplied from an early point, there is no possibility that the scheduled measurement value will be exceeded at the time when this switching operation is performed, and the measurement accuracy can be ensured.

If there is no excessive concentration of articles,
It is supplied by the large conveyor 3 and the small conveyor 2 until the weight reaches a predetermined value Y (90% of the planned measurement value), which is greater than the predetermined value X (50% of the planned measurement value), and thereafter only the small conveyor 2 is supplied. Since it is supplied by the above method, it is possible to efficiently measure without lowering the processing capacity.

In the above embodiment, the box support 11 is arranged only on one end side of the conveyors 2 and 3, so that the box packing efficiency is poor. Therefore, it is desirable to use an automatic packaging machine having the configuration shown in FIGS. 5 and 6.

That is, in the automatic packaging machine shown in FIGS. 5 and 6, the box support 12 having the same structure as the box support 11 shown in FIG. 1 is hydraulically attached to the right end of the small conveyor 2 and the large conveyor 3. The cylinder 18 is configured to be able to move up and down. The hydraulic cylinder 18 is rotatably attached to the machine frame 13 by a pivot 18a, and the tip of a rod 18b thereof is connected to an intermediate portion of the swivel arm 14. Further, in the figure, 8 is a flow trough, 10 is a weight sensor, and 22 is a carry-out roller conveyor. Note that other configurations are the same as those in FIG. 1, and therefore description thereof will be omitted.

According to the above construction, the box A is attached to the box supports 11 and 12 at the left and right ends of the small conveyor 2 and the large conveyor 3, respectively.
And the box B are arranged, the supply of the respective conveyors 2 and 3 to the box A is completed, and the conveying directions of the respective conveyors 2 and 3 can be reversed individually and supplied to the box B. Even during the replacement work, the two conveyors 2 and 3 can be supplied to the other box without stopping, and the weighing process can be continuously performed, so that the working efficiency can be significantly improved.

As the small conveyor 2 of this embodiment,
Of course, it is also possible to use a so-called one-piece feed conveyor that conveys fruits and vegetables one by one.

[0026]

As described above, according to the present invention, it is possible to detect the degree of supply of articles by the supply conveyor, and when the supply is large and a large number of articles are concentrated at one time, it is possible to quickly Since the supply by the large-scale conveyor was stopped and the small-scale conveyor was used to supply the small amount, it is possible to measure without being excessively supplied to the weight detector.
Therefore, the weighing accuracy can be secured.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of the present invention.

FIG. 2 is a plan view showing a main part of an embodiment of the present invention.

FIG. 3 is a block diagram showing an electric system of an embodiment of the present invention.

FIG. 4 is a flowchart showing an operation example of the embodiment of the present invention.

FIG. 5 is a front view showing another embodiment of the present invention.

FIG. 6 is a plan view showing a main part of another embodiment of the present invention.

[Explanation of symbols]

 1 Supply Conveyor 2 Small Quantity Conveyor 3 Large Mass Conveyor 7,8 Flow Gutter 11,12 Box Support 17,18 Hydraulic Cylinder 21,22 Roller Conveyor A, B Box C Fruits and Vegetables

Claims (1)

Claims: An article supplied by a supply conveyor is transferred to a small-quantity conveyor and a large-quantity conveyor, the articles are shared by both conveyors and supplied toward a weight detector, and the detected value is a predetermined first value. In an automatic packaging machine that switches to supply only by the small-quantity conveyor when the weight value is reached, the time measuring means for measuring the elapsed time after the weight detection of the weight detector is started, and the detection value of the weight detector is predetermined. A weight discriminating means for discriminating whether or not the second weight value is reached, and when the weight discriminating means judges that the predetermined second weight value is reached,
A count determination means for determining whether or not the count value of the timekeeping means is below a predetermined value, and a supply control means for stopping the supply by the mass transport conveyor when the count value is below the predetermined value. Fixed amount supply device in automatic packaging machine.