JPS6117390Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a device that automatically clears the unit price set on an electronic scale when a new unit price is set.

2. Description of the Related Art In recent years, electronic scales have become popular, which measure the weight of an item, calculate the price based on a preset unit price, and display the weight, price, and unit price, respectively. In this type of electronic scale, the unit price is set using a group of (key) switches provided in the unit price setting section, that is, numerical values 0, 1,...
This is done by sequentially turning on the switches corresponding to ..., 9 according to the unit price. The set unit price was cleared manually by turning on a clear switch provided in the unit price setting section.

Therefore, when changing the unit price frequently, the clear switch must be turned on each time, which is quite troublesome. In addition, if the clear switch was not turned on by mistake and the switches were turned on one after another according to newly different unit prices, an incorrect unit price could be set.

The present invention has been developed in view of the above-mentioned conventional problems, and aims to provide a device that automatically clears the previous unit price when setting a new unit price. Hereinafter, the configuration of the present invention will be explained with reference to the drawings.

In FIG. 1, 1 is a unit price setting section, 2 is a pulse generating section, 3 is a gate section, and 7 is a control circuit section, which are the main parts of the present invention. Also, 5 is a register,
6 is a display section that displays the price and weight in addition to the unit price. The unit price setting section 1 has a group of switches S for setting unit prices, each switch S-0, S-1...
S-9 corresponds to the numerical values 0, 1, 2..., 9. For example, if the unit price is 120 (yen), switch S-1
It is turned on sequentially from S-2 to S-0. In addition, the pulse generating section 2 turns on arbitrary switches S-0, S-1...S-9 in the unit price setting section 1.
, two consecutive pulse signals b ₁ and b ₂ are generated. Then, the first pulse signal _b1 enters the gate section 3, and if the gate section 3 is in an open state, this pulse signal _b1 enters the register 5 as a clear signal CL and clears the register 5.
Further, the subsequent pulse signal _b2 enters the control circuit section 7,
This is set and input to the register 5 as a data read signal.

The control circuit section 7 is set by an initial signal upon power-on and the aforementioned pulse signal _b3 , and generates an "H" level signal g that closes the gate section 3.
This is reset by a signal f, such as a weighing stability signal, a print signal, and a scale operation signal, which are generated at least once during each measurement, and generates an "L" level signal g that opens the gate section 3. Output.

Next, the operation of the above configuration will be explained using a specific circuit example shown in FIG. In addition, FIG. 3 shows a system in which the control circuit section 7 of the above configuration, which is cleared by an external signal, can be freely disconnected by a manual changeover switch M, and a timer section 4 that performs the functions of the control circuit section 7 with a separate structure is added. The configuration and operation of this additional circuit will be described later.

First, the control circuit section 7 performs clearing using an external signal.
This is an OR operation that takes the initial signal from power-on and the aforementioned pulse signal _b2 as input.
It consists of a circuit 13 and a flip-flop 14 which is set by the output signal C of this circuit 13.
The Q output d of the flip-flop 14 is connected to the contact _m1 of the changeover switch M, and the flip-flop 14 is reset by a signal f such as a weighing stability signal, a print signal, a scale operation signal, etc.

This control circuit section 7 performs the following operations. First, after setting the unit price, changeover switch M is switched from contact _m2 to contact _m1 at any time. Then OR circuit 15
The signal g to the gate changes from "L" to "H", the signal h changes from "H" to "L", and the gate section 3 becomes closed. Thereafter, for example, when a measurement is performed and a measurement stability signal f is output, the flip-flop 14 is reset. Q output force d changes from “H” to “L”,
The signals g and h are inverted, and the gate section 3 becomes open.

Then, in order to set a new unit price, when the first switch of the switch group S is turned on, the pulse signal _b1 is first output from the pulse generator 2, and the register 5 is cleared. Further, the next pulse signal _b2 sets the flip-flop 14 and changes the Q output d from "L" to "H". Then, the signals g and h are inverted again, and the gate section 3 becomes closed. Further, the pulse signal _b2 enters the timer section 4 and activates the timer section 4, but in this case, the operation of the timer section 4 has no effect. That is, since the gate section 3 is closed when the flip-flop 14 is set, the register 5 is not cleared even if the next switch in the switch group S is turned on.

Next, the timer section 4 will be described. This operates for a certain period of time after the pulse signal _b2 is input, and the gate section 3 is closed during that period. For example, when setting a unit price of 120 (yen), each switch S-
The ON times of switches S-1, S-2, and S-0 are set to t ₁ , t ₂ , and t _0, respectively, as shown in Figure 2, and the ON times of switches S-1 and S-2, and of switches S-2 and S-0 are Operation interval time
t ₁₂ and t ₂₀ , the set time T of the timer unit 4 is set so that T>t ₁ +t ₁₂ , T>t ₂ +t ₂₀ , and T>t ₀ . In other words, each switch S-
1, S-2, and S-0, the timer unit 4 operates from the time when the pulse signal _b2 is generated by turning on the switch S-1 until the end. In fact, switch operation times such as t ₁ + t ₁₂ and t ₂ + t ₂₀ take less than 3 seconds at most, so T is approximately 3 seconds.
It is safe to set it to seconds.

Now, connect switch M to contact _m2 ,
It is assumed that the control circuit section 7 is in a disconnected state and that the register 5 stores the previous unit price data. When setting a new unit price, for example 12 (yen), first press switch S-1 in unit price setting section 1.
Turn on. Then, O with switch group S as input
A signal S is output from the circuit 8 for a time t ₁ as shown in FIG. This time _t1 is the ON time of switch S-1. Then, as the signal a rises, the pulse generator 2 successively outputs the pulse signals b ₁ and b ₂ . It is assumed that the subsequent pulse signal b ₂ is generated at the fall of the first pulse signal b ₁ and that the width of these pulses is sufficiently smaller than that of the signal a.

First, the pulse signal _b2 will be described. It enters the timer section 4, activates the timer section 4, and outputs the signal e. That is, the signal e changes from logic level "L" to "H" and enters the OR circuit 15, and the output signal h of the NOT circuit 16 changes from "H" to "L". Furthermore, since the signal h is input to the AND circuit 9 of the gate section 3, the gate section 3 is closed when the signal h becomes "L". In other words, the gate section 3 remains open until the signal h becomes "L" upon generation of the pulse signal _b2 . Therefore,
The first pulse signal b ₁ is sent to the AND circuit 9 of the gate section 3
When it enters, AND is established and signal i is output. This signal i enters the register 5 as a clear signal CL via the OR circuit 12, and clears the previous data stored in the register 5.

On the other hand, the signal i from the gate section 3 is sent to the NOT circuit 1.
It is inverted at 0 and becomes a signal j, which enters the AND circuit 11. Since the unit price data is inputted to this AND circuit 11 from the unit price setting section 1, the unit price data is sent to the register 5 when the signal j is "H". On the other hand, the subsequent pulse signal b ₂ from the pulse generator 2
is sent to register 5 as a data read signal. Therefore, register 5 receives the subsequent pulse signal b ₂
From the time when , the data of switch S-1, ie, the numerical value 1, is read and stored. To summarize the above, when switch S-1 is turned on, first the pulse signal b ₁
occurs, register 5 is cleared, and the data of numerical value 1 is stored with the next pulse signal _b2 .

Next, switch S-1 is turned off and switch S-2 is turned on after _t12 hours. Since T> _t1 + _t12 , the timer section 4 continues to operate, and therefore the gate section 3 is turned on. It remains closed. Therefore, even if the pulse signal _b1 is output again from the pulse generator 2 when the switch S-2 is turned on, the gate unit 3 does not output the signal and the clear signal CL is not output. But after the pulse signal
b ₂ enters register 5 as a data read signal, causing the data value 2 at this time to be read into register 5. Then, register 5 is the previous number 1
is shifted and the numerical value 12 is stored, and this numerical value 12 is displayed on the unit price display section 6' of the display section 6. On the other hand, the subsequent pulse signal _b2 enters the timer section 4 and operates the timer section 4 again for T time.

If an error is made when setting the unit price of 12 yen, the switch group S can be operated again after time T has elapsed (approximately 3 seconds). In other words, after time T, the signal e of the timer unit 4 will have changed from "H" to "L", the signal h will be "H", and the gate unit 3 will be open, so the error correction will be the same as setting a new unit price.

In addition to the switch group S for unit price setting, the unit price setting section 1 is provided with a clear switch for specifically clearing the register 5.
A clear switch signal may be sent to the register 5 via the OR circuit 12 when turned ON. By doing this, if you want to clear the unit price without setting the unit price, all you have to do is turn on this clear switch. In addition, when setting the unit price with the changeover switch M connected to the contact _m2 , if the unit price is to be corrected before the set time T of the timer section 4 has elapsed, or when the changeover switch M is connected to the contact _m1 After connecting to the unit and setting the unit price, when correcting the unit price before the measurement stability signal etc. is generated as described above,
Turning on this clear switch clears register 5, and then turning on the required switches allows the unit price to be corrected.

As explained above, the present invention includes a unit price setting section having a group of switches for setting unit prices, a pulse generation section that outputs two consecutive pulse signals when any switch in the switch group is turned on, and a pulse generation section. A gate section that passes the first pulse signal of the two pulse signals to the unit price setting register as a clear signal for the set unit price, and an external signal such as a weighing stability signal that is generated at least once during each measurement. and a gate control circuit section that opens the gate section and closes the gate section with the later one of the two pulse signals of the pulse generating section, and the gate section is controlled by the external signal generated in connection with each weighing. Open the above gate and set the first switch when setting the unit price each time.
The unit price setting register is cleared by the first pulse signal when ON, and the unit price setting data of the switch is stored in the unit price setting register by the subsequent pulse signal, and the above gate is closed until the next external signal is input. By keeping the gate closed and turning on the next unit price setting switch, the unit price setting data is sequentially shifted and stored in the unit price setting register using a subsequent pulse signal, so a new unit price can be set. In relation to this, when the first unit price setting switch is turned on to set a new unit price, the old set unit price is automatically cleared.Therefore, not only does it eliminate the need for special operations to clear the old set unit price, In particular, since the unit price remains even after the item has been removed from the weighing pan after the measurement is completed, the price may be reconfirmed at the request of the seller or customer, or the weight of the same item may be added. In some cases, there is no need to reset the unit price,
Such cases often occur and are very convenient. In other words, what is necessary to set the unit price is
This is only when weighing the item, and it may be the same unit price as the previous time, or it may be a different unit price.Of course, you only need to set a new unit price if the unit price is different. It is. Moreover, the gate opening/closing control is opened every time a single weighing is performed, and is closed when the first switch is turned on to set a new unit price. There is no need to complete the setting of one unit price within the timer time,
Furthermore, since the next unit price setting does not require the timer setting time to elapse, the weighing efficiency can be improved, especially when products with different unit prices are weighed consecutively. Furthermore, if a mistake is made during the unit price setting operation, the gate can be opened simply by pressing the weighing pan, so the setting can be made again.

[Brief explanation of the drawing]

Fig. 1 is a schematic block diagram showing an embodiment of the device according to the present invention, Fig. 2 is a diagram explaining the setting time of the timer section, Fig. 3 is a block diagram showing a specific application example of Fig. 1, and Fig. 4 Figure 3 is a time chart of the output of each part. 1...Unit price setting section, 2...Pulse generation section, 3...
...gate section, 7...control circuit section, 5...register, S...switch.

Claims (1)

[Scope of utility model registration request] a unit price setting section having a switch group for unit price setting; a pulse generation section that generates two consecutive pulse signals when any switch in the switch group is turned on; There is a gate section that passes the pulse signal to the unit price setting register as a clear signal for the set unit price, and a pulse generation section that opens the gate section with an external signal such as a weighing stability signal that is generated at least once during each measurement. and a gate control circuit unit that closes the gate unit with a later pulse signal among the pulse signals, and by the external signal generated in connection with each weighing,
Open the above gate, clear the unit price setting register with the first pulse signal when the first switch is turned ON during each unit price setting, and use the subsequent pulse signal to transfer the unit price setting data of the switch to the unit price setting register. At the same time, the gate is closed, and the gate is kept closed until the next external signal is input, and when the next unit price setting switch is turned on, the unit price setting data is sequentially stored in the unit price setting register using the next pulse signal. An automatic unit price clearing device for an electronic scale, characterized in that it is made to shift and memorize it.