JPS5814606B2 - Weight checker - Google Patents

Description

[Detailed Description of the Invention] The present invention improves the checking accuracy and purpose of a weight checker, and when the main purpose is to check for insufficient weight, priority can be set for the required weight categories. If the ultimate objective is to increase the detection sensitivity of a weight category or to control costs, set a priority for a certain weight category to increase the detection sensitivity of that weight category. The present invention provides a highly reliable weight checker that allows the selection sensitivity to be set according to the purpose of use, even when the weight of the weight is close to the set point and it is difficult to determine whether it straddles two weight categories. be.

The details will be explained with reference to an example shown in the accompanying drawings.
2 is a conveyor for carrying in articles, and 2 is a conveyor for carrying out articles.

A weighing conveyor 3 mounted on a load converter 6 is disposed between each of the conveyors 1 and 2, and the instantaneous weight of the parts carried in by the carry-in conveyor is measured by the load converter 6. It is designed to be output as an analog output voltage e.

Further, the weighing conveyor 3 is equipped with a first sensor 4 on the carry-in side for detecting the carrying-in state of articles, and a second sensor 5 on the carry-out side for detecting the carrying-out of parts. .

Further, it is driven by the detection output signal t0 from the first sensor 4, and the detection output signal t0 from the second sensor 5.
A sampling signal generating circuit 13 is configured to perform each stop control at step 1, and the sampling signal generating circuit 13 is configured to generate a signal for the time required for the article to be conveyed between the first and second sensors 4 and 5 provided on the weighing conveyor 3. A sampling signal is output from 13.

Next, a configuration example of the control circuit shown in FIG. 3 will be explained.

7 is an operational amplifier, and in this amplifier I, a resistor R0 is installed so that the load signal generated when the conveyor 3 is driven with no parts placed on the conveyor 3 becomes zero.
In other words, the weight of the conveyor 3 itself and the amplitude load due to the drive amplitude are tared.

The signal e outputted from the amplifier 7 is connected to be input to each positive terminal of a required number of comparators CO1 to CO4 provided at the next stage.

A is a setting section for the weight class to be sorted, and each setting is made by adjusting variable resistors R1, R2, and R3 connected to the reference voltage, and the output through each resistor is input to each negative terminal of each comparator. It's connected like that.

Incidentally, each of the comparators CO1 to C04 described above is in a state in which output signals c1 to c4 are outputted when the analog output voltage e becomes larger than the set value.

Reference numeral 8 denotes a logic circuit that outputs outputs ω1 to ω4 of any of the weight class divisions, and the output from this logic circuit 8 is applied to the next AND gates 9, 10, 11, and 12 at the timing according to the sampling signal. The number of outputs is counted by counters K1 to K4 provided independently through one of them.

15 is a classification selection circuit for determining the maximum value of the contents of each of the counters, 14 is a condition setting circuit for setting the priority order of weight class, and B is an output gate circuit for selection signals W1 to W4.

The present invention has the above configuration, and its operation will be explained.

When the article is sent to the weighing conveyor 3 by the carry-in conveyor 1, the instantaneous weight of the article is transferred to the conveyor 3.
The load converter 6 outputs an analog output voltage e proportional to the weight.

At the same time, when the article passes through the first sensor 4, that is, when the article moves from the position C1 to the position C2, an output signal t0 is output, and the sampling signal generation circuit 13 is driven to perform a constant cycle. sampling signal is output.

Meanwhile, the weight signal from the load converter 6 is inputted to each comparator CO1 to C04 through an amplifier 7, and compared with each set value of the setting device A, and the input output voltage e is higher than the set value. becomes larger, a predetermined signal is output from the corresponding comparator, and the next logic circuit 8
3, and the logic circuit 8 determines which of the weight classification outputs ω1 to ω4 is inputted to the next AND game 1-9 to 12.

By the way, this output is manually inputted to the next counter through the AND game 1- at the timing according to the sampling signal described in section 3, and is counted by 1 for the output time of the sampling signal.

For example, the signal t output from the first sensor 4 as shown in FIG.

If the weight value at the time when the generator 13 is driven corresponds to the sorting signal W2 of the classification output, then the time until the article passes the second sensor 5 and the generator 13 is stopped is: The counter K2 counts, and a selection signal W2 is output as an absolute value through the division selection circuit 15 that determines the maximum value and the AND gates 19 and 21 of the gate circuit B. For example, if the output voltage e is If the condition is unstable, rising and falling with respect to the set value S2, the logic circuit 8 outputs the signal W2.
, and W3 are output in an unstable state, and it is difficult to determine which one to judge, but the output signal W2 or W3
3, the discrimination numbers of counters K2 and K3 are counted by sampling signals through the AND gates io and ii, respectively.

Therefore, the count contents of the counter are determined by the classification selection circuit 15, and the one with the larger count contents is finally selected.

Furthermore, by selecting the gate circuit B with the setting order signal from the condition setting circuit 14, it is possible to issue a sorting signal for the divided outputs according to the required priority order.

As described above, according to the present invention, the class classification output obtained by comparing the load detection value and the set value is counted using a sampling signal for a certain period of time, and the maximum judgment value for each class classification is determined. Even when it is not possible to determine which category a boundary point falls under, the one with the larger count number of the counter can be determined, which has the effect of improving the sensitivity and reliability of category selection.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing the configuration of the apparatus of the present invention, FIG. 2 is a relationship curve diagram between output voltage and time showing the discrimination state of the above, and FIG. 3 is a control block diagram of the same. 1... Conveyor for carrying in goods, 2...
Conveyor for carrying out goods, 3...Measuring conveyor,
4...first sensor, 5...second sensor, 6...load converter, 7...amplifier, 8... Logic circuit, 9-12...AND gate, 13...-Sampling signal generation circuit, 14...Condition setting circuit, 15...
・Division selection circuit.

Claims (1)

[Claims] 1. A weighing conveyor is provided between the conveyors for carrying in and carrying out goods, and the weighing value is determined by comparing the value measured by the weighing conveyor with a preset value. In a weight sorting device, a first sensor that detects the loading of articles and a second sensor that detects the loading of articles are provided, and the sampling is driven for a certain period of time using the outputs of the first and second sensors as control signals. a counter circuit that includes a signal generator and counts the number of times the class classification output is performed based on the comparison at the timing of the output sampling signal from the generator; and a classification selection circuit that has the content of the maximum count value of the counter circuit; A weight checker characterized by comprising an output condition setting circuit that determines the output priority order of weight classes.