JP2559210B2 - Combination weighing device - Google Patents

Description

TECHNICAL FIELD The present invention relates to a combination weighing device for performing combination weighing using a plurality of computers or unit computers.

(Prior Art) FIG. 8 is a schematic block diagram of a conventional combination weighing device. In the figure, the weight of an article is weighed by a plurality of weighing machines 1, the weight data obtained by each weighing machine is converted into a digital value through a multiplexer 2 and an A / D converter 3, and the center is composed of a microcomputer in sequence. Input to the processing device 4, the central processing unit performs a combination calculation of the weight data according to a predetermined combination pattern, and selects a weighing machine which is an optimum combination for the target weight set in advance by the target weight setting unit 6, The article is discharged from the selected weighing machine, and necessary items such as weight are displayed on the display unit 7. Further, the central processing unit operates in conjunction with the packaging machine 5, and the multiplexer sequentially switches the weight data by the timing signal from the packaging machine 5.

(Problems of the prior art) In such a combination weighing device, conventionally, control of a feeder for controlling the amount of articles supplied to each weighing machine, opening / closing control of a hopper such as a pool hopper, and a weighing hopper,
All of the processes from zero adjustment, span adjustment, sampling of the weighing values of each weighing machine to combination calculation were performed by a single computer. Therefore, when a new processing function is added, only sequential processing can be performed, and there is a problem in that the overall processing capacity is reduced. Therefore, there is a problem in that the degree of freedom with respect to specification changes, design changes, etc. is reduced, and the apparatus itself becomes a dedicated machine, resulting in cost increase.

(Object of the Present Invention) The present invention controls the combination weighing device by a plurality of unit computers and distributes the processing function to each computer, thereby improving the degree of freedom for specification changes, design changes, and the like. With the aim of making the combination weighing device a general-purpose machine,
Thus, it is an object to obtain a combination weighing device that can be applied to any weighing object at a low price, and at the same time to make it possible to perform a higher degree of control than ever before.

(Structure of the Invention) In order to achieve the above-mentioned object of the present invention, the combination weighing device of the present invention obtains a desired weighing value by combining weighing data obtained from a plurality of weighing machines. In a combination weighing device for discharging an object to be weighed of a weighing machine selected as a combination, a unit computer provided in each weighing machine and controlling the operation of a hopper attached to the weighing machine, and a unit computer provided in each weighing machine A computer for controlling the operation time and the operation intensity of the feeder that conveys the object to be weighed to the hopper, and the centralized control of each computer is performed to combine and calculate the weighing data obtained from each of a plurality of weighing machines, and to exceed the weighing data. When the start signal is received from the packaging machine and the combination calculation computer that monitors the scale, the combination calculation computer is notified of the combination calculation and the combination calculation is performed. When there is a discharge command from the calculation computer, the operation command of the weighing hopper, pool hopper, etc. is transmitted to the unit computer of the weighing machine related to the discharge combination according to the set timing, and the command for controlling the feeder operation time and vibration intensity is sent. A combination weighing device, comprising: a computer for controlling a feeder time control and a feeder operation intensity; and a drive command computer for issuing a command at a set timing, each computer sharing the function of the combination weighing device. I will provide a.

(Example) Next, an example of the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic block diagram of an embodiment of the combination weighing device of the present invention. In this embodiment, a total of N
One weighing machine 1 is provided, and one unit computer C1 to CN is provided for each of the N weighing machines, and each unit computer is connected via an interface F to a computer described later. These computers are connected to the packaging machine 5 and the console 10.

The above computer is for weight monitor, combination calculation,
Each of the computer units Aa, Ab, and Ac has its own function, and each unit computer C1 to CN has a corresponding weighing machine 1.
Control of the weighing hopper, the pool hopper, or the storage hopper (not shown) that stores the object to be weighed after weighing, and controls the operation time of the feeder 9 for each feeder 9. A feeder time control computer D and a feeder strength control computer E that controls the vibration strength of the feeder 9 are provided.

The weight monitor computer Aa constantly fetches the weight data of each weighing machine 1 to determine whether each weighing machine 1 is unloaded or loaded, and to determine whether the weighing machine 1 is stationary. Also, if requested by the combination computing computer Ab, Zero adjustment and span adjustment of each weighing machine 1 are also performed.

The computer for combination calculation Ab (hereinafter referred to as the main computer) is a mode set by the console 10, for example, various setting modes such as setting registration, normal operation operation, discharge operation at the end of operation, zero point adjustment, span adjustment, etc. According to the above, the respective computers are centrally controlled, and in the combination calculation, the weight data of the weighing machine 1 read from the weight monitor computer Aa and in the stationary and stable state is combined to obtain the optimum value closest to the target weight. A combination is selected, and the drive command computer Ac is instructed to discharge the object to be weighed according to the combination.

The drive command computer Ac is connected to the wrapping machine 5 via the interface F, and when receiving a start signal from the wrapping machine 5, the main computer Ab is notified of the start of the combination calculation, and the main computer Ab issues a discharge command. The operation command of the weighing hopper, the pool hopper, etc. is transmitted to the unit computer C of each weighing machine 1 according to the combination in accordance with the set timing, and further the command for controlling the operation time of the feeder, the vibration intensity, etc. is used for the feeder time control. It is transmitted to the computer D and the feeder strength control computer E at a set timing.

FIG. 2 is a flow chart showing a schematic operation procedure of the drive command computer Ac. First, at step A1, the start signal from the packaging machine 5 is checked. If there is no start signal, at step A2 the main computer is checked. Check the request for change in feeder strength set by Ab. If there is this change request, the feeder strength control computer E
And transfers the instructed intensity data to the computer E (step A3), and if there is no change request, the step A3 is skipped and the first step from the step A4.
Return to A1.

On the other hand, if the start signal is confirmed in step A1, the main computer Ab is notified of this (step
A5), wait for the result of combination operation.

Then, if there is a discharge command from the main computer Ab (step A6), the start timers of the weighing hopper, pool hopper, feeder, etc. are set according to the setting timing instructed by the main computer Ab (step A7), and each hopper is set according to this setting timing. And the feeder 9 are sequentially controlled. That is, if it is confirmed in step A8 that the start timer of the weighing hopper has timed out, an instruction to operate the weighing hopper is transmitted to the unit computer C1 of the weighing machine 1 relating to the discharge combination by interruption (step A9), and in step A10. If it is confirmed that the start timer of the pool hopper has timed out, a command for operating the pool hopper is also sent to the unit computer C of each weighing machine 1 by interruption (step A11). If the timer is not up, the corresponding step A9 or A11 is passed.

On the other hand, when the above-mentioned discharge command is issued, the drive request for the feeder is set, so the result of the check in step A4 is YE.
Then, in step A12, the time of the feeder start timer is checked. Then, if the time-up is confirmed, the stop timers of the respective feeders 9 relating to the discharge combination are set based on the instruction of the main computer Ab, and subsequently, the start instruction of the corresponding feeder is sent to the feeder time control computer E. Send by interrupt (step A13). Then, in the next step A14, the time-up of each timer is checked, and when the time-up is confirmed, an instruction to stop the corresponding feeder 9 is transmitted to the feeder time control computer D by interruption each time. That is, the drive command computer Ac is in charge of overall management of the operation time of each feeder 9.

FIG. 3 is a flow chart showing an outline of interrupt processing of the feeder time control computer D. When an interrupt occurs, in step D1, the transmitted data is received, and in the subsequent step D2, is there data regarding feeder control? Check whether or not. Then, if there is data, ON / OFF control of the designated feeder 9 is executed based on the received data (step D3), and if there is no data, this step D3 is passed and the process returns.

FIG. 4 is a flow chart showing a schematic procedure of the feeder strength control computer E. First, it is checked whether or not the feeder 9 is in operation on the stapler E1, and if it is in operation, each feeder 9 is designated. Set to strength (step
E2) If not in operation, it is checked in step E3 whether a communication request is output from the drive command computer Ac. If it is output, intensity data is received by the handshake method in the next step E4. If not output, the process returns to the first step E1 to check the feeder operation.

FIG. 5 is a flow chart showing an outline of the interrupt processing of each unit computer C.
In step C1, the transmitted data is received, and in the following step C2, it is checked whether or not the received data includes data related to the own device. If there is data, in the next step C3, the weighing hopper or pool hopper is operated according to the received contents, and if there is no data, this step C3 is passed and the process returns.

FIG. 6 is a flowchart showing the main procedure of each unit computer C. In this main, for example, the timing for applying the brake is constantly checked from the rotation angle of the cam or the like provided in the drive mechanism of the hopper ( At step C4), when the stop timing comes, the weighing hopper or pool hopper in operation is stopped (step C5).

Although not shown in this flow chart, when the above-mentioned brake timing is not detected even after a predetermined time has passed from the start of the operation of the hopper, an error signal is notified to the drive command computer Ac as a malfunction of the hopper. It is like this.

FIG. 7 is a flow chart showing the processing procedure of the weight monitor computer Aa, showing in detail the parts not shown in detail in FIG. 2, in which the computer reads the measured values of the respective weighing machines. This is a detailed description of the overscale check operation after that. Next, this flowchart will be described.

(1) Central processing unit of computer Aa for weight monitoring (CP
U) outputs the switching signal to the multiplexer (step 3
0), input the weight data from each weighing machine (step 3)
1). Next, it is checked whether or not there is overscale in the weight data (step 32), and if there is no overscale, an average value of the weight data up to a predetermined number of times is calculated and stored in the memory (step 33). Next, the average value of the weight data obtained last time is compared with the average value of the weight data obtained this time (step 34), and it is checked whether or not the weighing is stable (step 35).

(2) If the comparison result is stable, the stability flag is set (step 37), and if the comparison result is not stable, the stability flag is reset (step 36). Then, the error flag is reset (step 38). If the weight data includes overscale, the error flag is set (step 39), and then the stability flag is reset (step 40). Finally, the switching signal is changed to that of the next weighing machine (step 41), and the processing from step 30 onward is repeated.

(Effects of the Invention) As described above, according to the combination weighing device of the present invention, the following effects can be obtained.

(1) Since each operation of the combination weighing device is controlled by a plurality of computers, specification changes, design changes, and the like can be easily performed, and more complicated functions and parallel processing can be easily performed. Therefore, the versatility of the combination weighing device can be improved, the cost can be reduced, and the function can be improved.

In addition, since the overscale of each weighing machine and the monitoring of the feeder and the like can be sufficiently performed, it is possible to promptly take a recovery measure for self-recovery even when an operation abnormality occurs.

[Brief description of drawings]

FIG. 1 is a schematic block diagram of an embodiment of a combination weighing device of the present invention, FIG. 2 is a flowchart showing a processing procedure of an embodiment of the present invention, and FIG. 3 is a main operation procedure of a feeder time control computer. 4 is a flowchart showing a main operation procedure of the computer for forced feeder control, FIG. 5 is a flowchart showing an operation procedure of interrupt processing of the unit computer, and FIG. 6 is a main operation procedure of the unit computer. FIG. 7 is a flowchart showing a processing procedure of the computer Aa, and FIG. 8 is a schematic block diagram of a conventional example. A: Main computer, C1-CN ... Sub computer, 1 ... Weighing machine, 2 ... Multiplexer, 3 ... A /
D converter, 5 ... Wrapping machine, 9 ... Feeder, 10 ... Console.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Seiji Yamada 959-1, Shimohage, Ritto-cho, Kurita-gun, Shiga Shiga factory, Ishida Kouki Co., Ltd. (56) Reference JP-A-58-202842 (JP, A) 59-623 (JP, A) JP 59-52719 (JP, A) JP 59-202029 (JP, A) Actual development 59-74401 (JP, U) Actual 59-140812 (JP , U)

Claims (1)

(57) [Claims] 1. A combination weighing device for combining weighing data obtained from a plurality of weighing machines to obtain a desired weighing value, and discharging an object to be weighed by the weighing machine selected in the combination, A unit computer provided in the weighing machine, which controls the operation of a hopper attached to the weighing machine, and a computer which controls the operating time and the operating strength of a feeder for carrying the object to be weighed to the hopper attached to each weighing machine, A combination calculation computer that performs centralized control of each computer and performs a combination calculation of weighing data obtained from each of a plurality of weighing machines and monitors an overscale of the weighing data; and a combination calculation when the start signal is received from the packaging machine. The combination calculation computer is notified, and when the combination calculation computer issues a discharge command, the unit of the weighing machine relating to the discharge combination is notified. Sends operation commands for the weighing hopper, pool hopper, etc. to the computer according to the set timing, and sends commands for controlling the operation time and vibration intensity of the feeder to the computer that controls the feeder time control and feeder operation intensity at the set timing. A combination weighing device, comprising: a drive command computer for performing the above, and each computer is assigned the function of the combination weighing device.