JPH0138499Y2 - - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a piece counting scale.

With conventional piece counting scales, each time the average unit weight of a sample changes, you have to key in the new average unit weight using the numeric keypad, or place a known number of samples again and calculate the current weight value. Currently, the number of pieces is calculated after calculating a new average unit weight from the known number. The above-mentioned operation for setting the average unit weight each time the average unit weight changes is troublesome, and is particularly inconvenient when calculating the number of pieces by using several fixed average unit weights.

Therefore, the present invention has been made in order to avoid the above-mentioned problems, and is configured such that a memory device capable of storing average unit weight is provided, and a predetermined average unit weight is read out from the memory device and used. , provides a counting scale that can be expected to improve operability.

An embodiment of the present invention will be described below based on the drawings.

1 is an analog-to-digital converter that converts the load cell 3 output signal via amplifier 2 into a digital value, 4 is a memory for tare storage, 5 is an analog-to-digital converter that accepts the output of 1 as the minuend, and subtracts the output of memory 4. 6 and 7 are I/N circuits that connect the output of the subtractor 5 and the output of the memory 4 (for example, N=5), 8,
9 is a rounding circuit that rounds off and corrects the lowest digit of the output of I/N circuits 6 and 7, 10 and 11 are multipliers for changing the minimum scale, and multiplier 10 multiplies the output of rounding circuit 8 by a coefficient K. The multiplier 11 multiplies the output of the rounding circuit 9 by a coefficient K and outputs the result to the tare display section 13. A divider 14 serves as a first divider for calculating the number of pieces, and accepts the output signal of the I/N circuit 6 as the weight value of the unknown number of samples, and receives the signal Da representing the average unit weight as the divisor.
A multiplier 15 multiplies the output of the divider 14 by the coefficient K, and the calculation result is rounded off to the nearest whole number and digitally displayed on the number display section 16.

Here, the resolution of analog-to-digital converter 1 is
15000 and the coefficient K=1, the scale has a weighing capacity of 3 kg and a minimum scale of 1 g. Also, the coefficient K
If = 2, the scale has a weighing capacity of 6 kg and a minimum scale of 2 g, and if the coefficient K = 5, the scale has a weighing capacity of 15 kg and a minimum scale of 5 g.

The signal Da representing the average unit weight is given as follows.

17 is an arithmetic unit that repeatedly reads the output W _(t) of the subtracter 5 through the gate 18 at predetermined intervals n times [n≧2, for example, n=5], and reads each of the first to fifth readings. If the values of times are W ₁ , W ₂ , W ₃ , W ₄ , W ₅ , then practically W ₁ + W ₂ + W ₃ + W ₄ + W ₅ /n・N=〓〓W _(t) /25 The arithmetic mean is calculated by the calculation [g], but here the unit is converted to milligrams by the calculation [ ₅ 〓 ^t=1 W _(t) ]·40. Reference numeral 19 denotes a register for storing the set value entered using the numeric keypad 20, in which the average unit weight or the number of samples is written, and a predetermined clear signal C is written.
Cleared by . 21 is a divider as a second divider, which takes the output of the arithmetic unit 17 as the dividend;
The output of register 19 is used as the divisor. 22 is a register that stores the output of the divider 21; 23 is a multiplier that multiplies the output of the register 22 by the coefficient K; 24 is a first gate circuit that selectively outputs the output of the register 19 or the output of the multiplier 23; 25,2
It consists of 6,27. 28 is the gate 18 and the first
A key switch (hereinafter referred to as the number key) that controls the gate circuit 24 of the gate 18 before operation.
is in the off state, the first gate circuit 24 is in the register 1
After the operation, the operation state is held until the operation of the erase instruction switch (not shown) or the numeric keypad 20 is detected, the gate 18 is turned on, and the first gate circuit 24 is turned on as a multiplier. 23 output state. Reference numeral 29 denotes a memory device whose write/read mode is selected by a switch 30, and is composed of a RAM backed up by a battery separate from the commercial power supply.
In the write mode, the first gate circuit 24 at the address specified by the address signal A at that time is
The output signal is written, and in the read mode, the value written in advance at the address designated by the address signal A is read out as the average unit weight. 31 is an address specifying unit that outputs the address signal A corresponding to the write/read address to the memory device 29;
For example, write the average unit weight of 9 pieces as appropriate/
Push button switches SW ₁ to _{SW 9} to indicate different readout
is provided. 32 is a second gate circuit that selectively outputs the output of the first gate circuit 24 or the read output B of the memory device 29; the output state is selected by the switch 33; The output is the signal representing the average unit weight.
Da is input as a divisor to the divider 14,
The average unit weight display section 34 also displays the weight.

With this configuration, the value keyed into the register 19 via the numeric keypad 20 before operating the number key 28 is supplied to the memory device 29 via the first gate circuit 24 in milligrams; Divider 1 via gate circuit 32
4 and is supplied to the average unit weight display section 34. In this state, if you operate one of the pushbutton switches SW ₁ to _{SW 9} (for example, SW ₁ ) of the address specifying section 31 and the switch 30 to write the contents of the register 19 at that time into the memory device 29, the contents of the register 19 at that time are written. If you want to calculate the number of pieces using the same average unit weight again even after clearing the contents, set the switch 33 to the output state of the readout output B and press the push button switch SW ₁ .
By selecting , the average unit weight written in advance can be read out without having to key in using the numeric keypad 20, and the number of pieces can be quickly calculated.

In addition, by applying the load of a known number of E samples (for example, E = 50) to the load cell 3, keying in the known number E of "50" in the register 19 via the numeric keypad 20, and then operating the number key 28, the The multiplier 17 automatically calculates the arithmetic average of n times, the divider 21 causes the calculated average unit weight to be held in the register 22, and the multiplier 23 and the first gate circuit 2
Similarly to the register 19, the output of the multiplier 23 is supplied to the divider 14 and the average unit weight display section 34 via the second gate circuit 32. In this state, address specification section 3
When the output of the multiplier 23 at that time is written into the memory device 29 by operating one of the push button switches SW ₁ to SW ₉ [for example, SW ₂ ] and the switch 30, the contents of the register 22 are temporarily cleared. In this case, the number can be quickly calculated by operating the switch 33 and the push button switch SW ₂ of the address designation section 31, without having to place the known number of E samples again and calculate the average unit weight. can be done.

To calculate the number of unknown samples,
The load of the unknown sample is applied to the load cell 3, and the divider 14 applies the load to the register 19 or the multiplier 2.
3 or the symbol Da read from the memory device 29 as a divisor, and the result of the calculation is passed through the multiplier 15 to display the desired number on the number display section 34.

As explained above, according to the piece counting scale of the present invention, the average unit weight is written in the memory device,
Since it can be read out from the memory device and used with a single touch, you can use the key-in operation using the numeric keypad to read the average unit weight each time the average unit weight changes, as in the past, or load the average unit weight by placing a known number of samples. There is no need to perform calculation operations. Moreover, since a second divider and a first gate circuit were provided, and the output of the first gate circuit was supplied to the write input of the memory device, the value of the average unit weight calculated from the weight value could be directly stored in the memory. It is possible to write the calculated average unit weight into the device, and there is no need to manually input the calculated average unit weight by operating the input device, thereby significantly improving the operability of the piece counting scale.

[Brief explanation of the drawing]

The drawing is a block diagram of an embodiment of a counting scale according to the present invention. DESCRIPTION OF SYMBOLS 1... Analog-digital converter, 3... Load cell, 14, 21... Divider, 16... Number display section, 20... Numeric keypad, 24... First gate circuit, 29... Memory device, 31...Address designation section, 32...Second gate circuit, 34...Average unit weight display section.

Claims (1)

[Scope of utility model registration request] A first divider 1 with the weighted value of the unknown sample as the dividend and the average unit weight of the sample as the divisor.
4, a memory device 29 capable of storing a plurality of average unit weight values, an input device 20 for inputting numerical values, and a known sample input from the input device 20 with the weight value as a dividend. a second divider 21 that calculates an average unit weight value by dividing the number as a divisor; A first gate circuit 24 selects and outputs one of the weight values, and a first gate circuit 24 selects and outputs one of the output value of the first gate circuit 24 and the average unit weight value read from the memory device 29. 2 gate circuits 32 are provided, the output value of the second gate circuit 32 is supplied to the divisor input of the first divider 14, and the output of the first gate circuit 24 is supplied to the write input of the memory device 29. Supplied piece counting scale.