JPH0663813B2 - Weighing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a weighing device for performing combination weighing or combination counting when overscale occurs in the weighing machine.
The present invention relates to a weighing device that can be continuously operated or stopped without stopping the device.

(Conventional example) Detecting the weights of articles respectively put into a plurality of weighing machines, inputting the respective weights through a multiplexer and an A / D converter to an arithmetic control unit composed of a microcomputer and the like, and performing arithmetic control. In the section, combination calculation is executed in a predetermined pattern, the preset target weight is compared with the combination weight to select the optimum combination, and the article is discharged from the selected weighing machine. The device is known. In addition, the number of articles loaded into each of a plurality of weighing machines is calculated based on the weight of each weighing machine in the arithmetic control unit, and the number obtained by the combination calculation and the target number are compared to obtain the optimum combination. Also known is a combination counting device adapted to discharge articles from the weighing machine.

In such a combination weighing (counting) device, a packaging machine for packaging discharged articles is arranged in close proximity, and several sets of the combination weighing (counting) device and the packaging machine are installed in one factory. Dozens of them are installed. In addition, in a factory with strict weight management, in addition to a combination weighing (counting) device and a packaging machine, a weight checker is also provided to check whether the weight of the packaged goods is proper. Is operated and monitored by one to several operators.

(Problems of the prior art) In the combination weighing (counting) device as described above, if even one weighing machine is overscaled, the combination weighing (counting) device automatically stops and the operator performs the combination weighing (counting). ) When it was discovered that the equipment had stopped, the packaging machine was placed in a standby state and the articles in the overscaled weighing machine were forcibly discharged manually. This is because if the overscaled articles are discharged to the packaging machine as they are, various problems may occur on the packaging machine side, for example, the packaging mechanism may be damaged due to the packaging of articles exceeding the allowable amount. Because.
However, depending on the type of the article, the packaging form, etc., it may be permitted to discharge the overscaled article as it is, and in such a case, there is a problem that the conventional apparatus cannot handle it.

(Object of the Invention) An object of the present invention is to allow a combination weighing (counting) device to be continuously operated or stopped without stopping when the weighing machine is overscaled. To provide a weighing device.

(Summary of the Invention) The weighing device of the present invention weighs articles with a plurality of weighing machines,
A combination calculation is performed according to each weight measured or the number of articles converted from each weight, and the obtained combination weight or the combination number is equal to the target weight or the target number, or a combination closest to it is selected as an optimum combination, In a weighing device for performing combination weighing or combination counting for discharging articles from a weighing machine corresponding to this, detection means for detecting a weighing machine in which overscale has occurred, and when the detection means detects overscale of the weighing machine, A first operation mode of discharging an overscaled weighing machine article and supplying a new article to the weighing machine, a second operation mode of stopping the combination weighing operation of the combination weighing machine, and an overscale occurred. When the number of weighing machines exceeds a specified value,
When the weighing operation of the combination weighing machine is stopped and the value is below the specified value,
And a switching means for selecting one of the third operation modes in which the combination is performed only with the weighing machine excluding the overscale weighing machine.

Embodiment An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic block diagram of the device of the present invention. In the figure, 1 is a weighing machine installed in n units, which weighs articles put in from a pool hopper (not shown) with a weighing hopper,
Generate analog values W _{1 to} W _n . When the timing signal St from the packaging machine 10 is input to the arithmetic control unit 4 including a microcomputer or the like, the arithmetic control unit 4 sends a select signal Sf to the multiplexer 2, and the multiplexer sequentially outputs the weights W _{1 to} W _n . Output to the A / D converter 3. The A / D converter 3 converts the weight into a digital value and outputs it to the arithmetic control unit 4, and the arithmetic control unit 4 stores each weight in the storage unit 5.
Sequentially stored in the weight memory. The calculation control unit 4 reads out the respective weights W _{1 to} W _n stored in the weight memory, executes a combination calculation in a predetermined pattern, and compares the target weight set in advance by the target weight setting unit 8 with the combination weight. To do. Further, when the upper limit weight is set by the upper limit weight setting unit 7, one optimum combination having a combination weight equal to or more than the target weight and equal to or less than the target weight is selected, The weighing hopper of the weighing machine selected as the optimum combination is opened and the article is discharged. When the discharged articles are packaged by the packaging machine 10 and the weight checker 12 is further provided, the wrapped article is conveyed to the weight checker by the conveyor 11. The storage unit 5 is provided with an overscale flag memory in addition to the weight memory. Further, the overscale display unit 6 can display which weighing machine is overscaled.

As will be described later, the switching unit 9 has a mode in which when an overscale occurs in the weighing machine, the article is automatically discharged from the overscale weighing machine and is rejected by the weight checker as a defective product, and the overscale weighing is performed. Switches SW ₁ and SW ₂ are provided for switching between a mode in which a machine is excluded and a mode in which combined weighing (counting) is executed. That is, before operating the combination weighing machine, the switches SW ₁ and SW
₂ is preset according to the desired operation mode. Then, when the switch SW ₁ is set to ON, the operation mode is in which the article in the overscaled weighing machine is discharged and a new article is loaded. When the switch SW1 is set to OFF, the ON switch SW _2, the operation mode is changed in the off state. If the switch SW ₂ is on, the operation mode is in which the combination weighing operation of the combination weighing machine is stopped when overscale of each weighing machine occurs. When the switch SW ₂ is off, the operation mode is in which the combined weighing operation is executed only by the weighing machine in which overscale has not occurred.

The above description is an example of a combination weighing device, but when used as a combination counting device, each weight input to the arithmetic control unit is set for each article set by a unit weight setting unit (not shown). It is divided by the average weight (single weight) to be converted into a number, and this number is combined and calculated from a predetermined pattern. The obtained number of combinations is compared with the target number and the optimum combination equal to or closest to the target number is selected. Then, when the upper limit number is set, a weighing machine which is equal to or more than the target number and equal to or less than the target number is selected as the optimum combination, and the article is discharged.

FIG. 2 is a flowchart showing the processing procedure of the present invention. Next, this flowchart will be described.

(1) When the packaging machine 10 outputs a timing signal to the arithmetic control unit 4 (step P ₁ ), the arithmetic control unit 4 outputs A /
The weight from each weighing machine is sequentially taken in from the multiplexer 2 through the D converter 3 and stored in the weight memory of the storage unit 5 (step P ₂ ). Check that each weight is not overscaled (step P ₂ ), and weight W _{1 to} W
_A combination calculation is executed with _n , and one optimum combination which is equal to or close to the target weight and is equal to or more than the target weight and equal to or less than the upper limit weight is obtained (step P ₄ ). If it is confirmed that the optimum combination has been obtained (step P ₅ ), it is checked whether or not the optimum combination includes the weighing machine with the overscale flag “H” (step P ₆ ), and it is included. If not, the weighing hopper of the weighing machine of the optimum combination is opened (step P ₇ ) and the article is discharged. Then, the pool hopper of the weighing machine with the weighing hopper opened is opened to newly supply the article (step P ₈ ). In the case where no optimal combination is obtained step P, a predetermined weight or less of the weighing machine, additionally supplying the articles overscale flag opens the pool hopper of the weighing machine is not "H" (step P _9). Further, in Step P ₆ , when the weighing machine with the overscale flag “H” is included as the optimum combination, the weighing machines other than the weighing machines with the overscale flag “H” are included in the optimum combination. to open the weighing hopper to discharge the articles (step P _10).

(2) Step P _3, when it is determined that the over-scale of the weighing machine Yes, displays the overscale the weighing machine to Overscale display unit 6 (step P _11). Then, it is checked whether the switch 1 of the switching unit 9 is on (step P ₁₂ ). If the switch 1 is turned on, by opening the weighing hopper of overscale the weighing machine automatically discharges the articles (step P _17), and an article new open pool hoppers of the weighing hoppers opening of the weighing machine Supply (step P ₁₈ ). The automatically discharged articles are packaged by the packaging machine 10 and then rejected as defective products by the weight checker 12. During this period, the combination weighing device is continuously operating without stopping its operation. become.

(3) When the switch 1 is turned off in step P ₁₂ , the state of the switch 2 is next determined (step P ₁₃ ). If the switch 2 is on, the combination weighing device is stopped. That is, in this case, if overscale occurs, the mode for stopping the combination weighing device is selected. This is to cope with various troubles that occur when an overscaled article is directly discharged to a packaging machine. If the switch 2 is turned off, the over-scaling flag of overscale the weighing machine to "H" (step P _14). Subsequently, the flag is the number of over-scale flag of "H" is checked to see if the either 2 or more, (step P _15), when this condition is satisfied, stopping the combination weighing device. In other words, if two or more weighing machines become unusable, the weighing accuracy will become extremely poor and the situation will not be improved.
The device is once stopped to eliminate the overscale condition. However, if there is only one overscale weighing machine, the weight memory of the weighing machine with the overscale graph “H” is zero-cleared (step P ₁₆ ), and the combination calculation after step P ₄ and the subsequent processing are executed. To do. Therefore, the combination calculation in this case is executed excluding the weight of the overscale weighing machine.

The above is a description of the combination weighing device, but also for the combination counting device, the process when overscaling occurs is executed in the same manner as the case of the combination weighing device, except for the condition determination of the optimum combination.

(Effects of the Invention) As described above, according to the present invention, a mode in which articles in an overscaled weighing machine are automatically discharged to continue a combination weighing operation, and a number of overscaled weighing machines is a predetermined number or more. If so, the combination weighing operation is stopped, and if the number is less than the specified number, the weighing operation is continued with the remaining weighing machines excluding the weighing machine, and if the overscale occurs, the weighing operation is immediately stopped. Can be freely switched and set, so that the operating rate of the weighing device can be increased and the packaging machine can be protected according to the type of article and the packaging form.

[Brief description of drawings]

FIG. 1 is a schematic block diagram of a combination weighing device of the present invention,
FIG. 2 is a flowchart. 1 ... Weighing machine, 2 ... Multiplexer, 3 ... A / D converter, 4 ... Arithmetic control unit, 5 ... Storage unit, 6 ... Overscale display unit, 7 ... Upper limit weight setting unit, 8 …… Target weight setting section, 9 ……
Switching unit, 10 ... packaging machine, 11 ... conveyor, 12 ... weight checker.

Claims (1)

[Claims] 1. A plurality of weighing machines are used to weigh articles, and a combination operation is performed based on each weight weighed or the number of articles converted from each weight, and the obtained combination weight or combination number becomes a target weight or target number. In a weighing device that performs combination weighing or combination counting, in which an equal or closest combination is selected as an optimal combination and articles are discharged from the weighing machine corresponding to this, detection means for detecting a weighing machine in which overscale has occurred A first operation mode of discharging the overscaled weighing machine article and supplying a new article to the weighing machine when the detection means detects an overscale of the weighing machine; and a combination weighing machine of the combination weighing machine. The second operation mode that stops the operation and the weighing operation of the combination weighing machine is stopped when the number of weighing machines that have overscaled is more than a predetermined value. And a switching means for selecting any one of the third operation modes in which the combination is performed only with the weighing machine excluding the overscale weighing machine when the value is less than a predetermined value. apparatus.