JPS638410B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for checking the display section of a scale that digitally displays weight values, etc., and a weighing machine that displays a set unit price and the price of an object to be weighed, such as a fee scale, which is easy to operate and reliable. The present invention provides a checking method that enables highly accurate checking.

The conventional method of checking the display unit configured with a segment type display is to display the same number on all digits of the display unit at the same time, and check whether the display units are all displaying the same number. This is to determine the Since this checking method compares the display contents of a large number of display devices, it is theoretically possible to find a display device having a segment with a defective light emission with an extremely high probability. However, because the display unit has a large number of indicators arranged at narrow intervals, there are many cases of misreading when checking whether the same number is displayed in all digits, and it is easy to identify defective indicators. This is something that is often overlooked. In addition, it is possible to sequentially determine whether the display content of one of the many displays displayed simultaneously across all digits of the display is the same as the other displays, sequentially across all of the digits of the display. This causes unnecessary fatigue to the operator and is difficult to operate.

The method for checking a display unit according to the present invention is such that, among the multi-digit segment-type displays constituting the display unit, specific check characters can be simultaneously displayed on a plurality of partial displays of the multi-digits. When inputting a check signal corresponding to a predetermined type of check character to display the check character is completed, at least one of the partial display devices and a predetermined number of the remaining display devices are turned on. The present invention is characterized in that a display unit is brought into a state in which a specific check character can be displayed and confirmed at the same time, and all indicators of the display unit are sequentially brought into a state in which a specific check character is displayed, and the above-mentioned drawbacks of the conventional technology are solved. It is something that can be done.

The checking method according to the present invention will be explained below based on examples.

Figure 1 shows the display peripheral circuit of a weighing machine equipped with a display check circuit, where segment type displays Dp ₁ , Dp ₂ , Dp ₃ and Dp ₄ are ring counters.
Dynamic pulses p ₁ to _{p 4} sequentially output from CNT ₁
It is dynamically driven by. DG
is the weight value data transmitted from the load converter (not shown), and the first data consists of the code "A ₁ B ₁ C ₁ D ₁ " to be sent to the first digit display Dp ₁ ;
“A ₂ B ₂ C ₂ D ₂ ” “A ₃ B ₃ C ₃ D ₃ ” to be sent to the second digit display Dp ₂ , third digit display Dp ₃ and fourth digit display Dp ₄ respectively It is composed of second, third, and fourth data consisting of "A ₄ B ₄ C ₄ D ₄ ". OSC ₁ is a counter consisting of an oscillator that repeatedly outputs a pulse signal at a predetermined period, and an n-ary counter that counts the pulse signals from the oscillator.
For example, a pulse signal CK ₁ with a period of 2 seconds and a pulse signal
It outputs a pulse signal CK ₂ which is the frequency of CK ₁ divided by 1/10. OSC ₂ is a specific signal generation unit that sequentially switches output data “A ₀ B ₀ C ₀ D ₀ ” to code signal D ₀ corresponding to 10 check characters from 0 to 9 at the cycle of pulse signal CK ₁ and outputs it. , E is a timer that detects the elapse of a predetermined time from the time when the power switch F of the weighing machine is turned on, and J is the output data of the specific signal generator OSC ₂ "A ₀ A display data selection section controlled by the timer E to output "B ₀ C ₀ D ₀ " as the first to fourth data, SWA, SWB, SWC,
SWD is the code signal of the ring counter CNT ₁
A switch section that selectively passes display data selection section J output data by _C0 .
For SWA to SWD, ring counter CNT ₁ is the indicator.
At the timing when the dynamic pulse P ₁ that should select Dp ₁ is being output, the input terminals a ₁ , a ₂ ,
Among the data input to a ₃ , a ₄ , b ₁ to b ₄ , c ₁ to c ₄ , and d ₁ to d ₄ , the data of input terminals a ₁ , b ₁ , c ₁ , and d ₁ are selectively selected. Output to. K is a decoder driver that controls the display in response to the "ABCD" code signals output by switches SWA, SWB, SWC, and SWD.
Code conversion is performed so that predetermined segments Dp ₁ , Dp ₂ , Dp ₃ , and Dp ₄ can be lit, and here it is assumed that the indicators Dp ₁ to Dp ₄ are composed of seven segments of light emitting diodes.

CNT ₂ is a counter that sequentially selects output terminals T ₁ , T ₂ , and T ₃ each time the pulse signal CK ₂ is input, and M is a counter that selects the output terminals T 1 , T 2 , and T 3 sequentially every time the pulse signal CK ₂ is input. display
The dynamic pulses p ₁ to p ₄ for selecting Dp ₁ to _{Dp 4} are connected to the counter CNT ₂ output terminals T ₁ , T ₂ , T ₃
Dynamic pulses _{p 1 , p 2} , _{p 3 ,} p ₄ as is, display Dp ₁ ~
Supply to Dp ₄ .

Next, the operation will be explained based on FIGS. 2 a to i.

First, when the power is turned on [Fig. 2 a] at time T ₁ ,
Power supply to each block is started and the counter
CNT ₂ outputs a pulse CK ₁ (FIG. 2b), and timer E (FIG. 2c) starts detecting a predetermined time t ₂ from time t ₁ .

Since the output terminals T ₁ to _{T 3} of the counter CNT ₂ are selected during the period ( ) until the first pulse signal CK ₂ [Fig. 2 h] is output, the _program section M is Dynamic pulse p ₃ from counter CNT ₁ to display Dp ₃ , Dp ₄ ,
_The supply of p ₄ is inhibited as shown in FIG. ₂ f and g, respectively, and the dynamic pulses p ₁ ,
Pass p ₂ as shown in Figure 2 d and e, respectively, and
Two indicators Dp ₁ out of one indicator Dp ₁ to Dp ₄ ,
Make Dp ₂ displayable. Display data selection section J
The predetermined time t ₂ from the time t ₁ is the weighing value data.
In order to output the "A ₀ B ₀ C ₀ D ₀ " check signal [Fig. 2 j] output by the specific signal generator OSC ₂ instead of the DG, the decoder driver K receives the code signal of the ring counter CNT ₁ . “A ₀ B ₀ C ₀ D ₀ ” is input regardless of C ₀ . However, since only the displays Dp ₁ and Dp ₂ are in a displayable state during the period (I), even if a check signal is input to the decoder driver K regardless of the code signal C ₀ , the check character will be displayed on the display Dp ₁ . , It is in a state where it is only displayed on Dp ₂ . During this period (), the check signal sequentially changes to 10 types from 0 to 9 at 2-second intervals as shown in Fig. 2j, so the operator must first check whether the display contents on display Dp ₁ and display Dp ₂ are the same. Make sure that first pulse signal
When CK ₂ is input and T ₂ is selected instead of output terminal T ₁ , in the period () from time t ₃ when the pulse signal CK ₂ is input until the second pulse signal CK ₂ is input, The program section M prohibits the passage of dynamic pulses _p1 and _p4 , and displays an indicator _Dp1 indicating that the check is considered complete at the end of the period ().
Of the display devices Dp 2 and Dp ₂ , the display device Dp ₂ and the display device Dp ₃ become displayable. And the operator is the display
Check that Dp ₂ and Dp ₃ have the same display content. Next, when the second pulse signal CK ₂ is input at time t ₄ , the output terminal of the counter CNT ₂
Since the output terminal T ₃ is selected instead of T ₂ , the program section M prohibits the passage of the dynamic pulses p ₁ and p ₂ , and displays the indicators Dp ₂ and Dp whose check is considered to be completed in the period (). Display device D ₃ out of ₃
Then, the display device _Dp4 becomes displayable, and the operator confirms that the check characters that change sequentially at the cycle of the pulse signal _CK1 are the same for both. Here, the predetermined time _t2 of the timer E is set to the time from time _t1 to time _t5 when the third pulse signal _CK2 is input.

When the timer E detects the elapse of the predetermined time _t2 , the input signal to the decoder driver K becomes a check signal.
The weighing value signal DG is input instead of D ₀ , and
The program section M is in a state in which it does not prohibit passage of the dynamic pulses _p1 to _p4 .

In this way, the display devices Dp ₁ and Dp ₂ , Dp ₂ and Dp ₃ , Dp ₃ and
For example, when checking Dp ₁ and Dp ₂ , the display contents of some of the displays constituting the display section are compared and checked sequentially, such as Dp ₄ .
Since Dp ₃ and Dp ₄ are configured to be in a state in which lighting is prohibited, the reading error is reduced compared to the conventional case. Also, periods (), (), and () are not performed independently, and some displays are checked in duplicate with the display that was considered to have been checked in the previous check period. Even though the same number is not displayed on all digits of the display at the same time for checking, the accuracy does not deteriorate.

3a to 3i show waveform diagrams of another embodiment, which differs from the previous embodiment in the following points.

In the embodiment, the counter CNT ₂ receives the pulse signal CK ₁ with a repetition period of 2 seconds and the pulse signal
It is configured to output a pulse signal CK ₂ which is the frequency of CK ₁ divided by 1/10, and the display Dp ₁ and
When the input of 10 check signals from 0 to 9 is completed, the display device Dp _{2 is} enabled to display.
The repetition period of _{the pulse signal CK 2 input to the counter CNT 2 is} set to 2 seconds, and the pulse signal CK input to the specific signal generator OSC ₂ is The repetition period of ₁ is 6 seconds, which is the time required for one cycle of the output terminals T ₁ to _{T 3} of the counter CNT ₂ , and the display Dp ₁
, Dp ₂ , displays Dp ₂ and Dp ₃ , and displays Dp ₃ and Dp ₄ are made selectively displayable in sequence at 2-second intervals, and the check signal is switched when the output terminals T ₁ to _{T 3} go through one cycle. It is composed of In addition, Figure 3 a~
i corresponds to a to i in FIG.

Note that in the above embodiment, a check signal is always input to all the displays Dp ₁ to Dp ₄ , so that, for example, the display Dp ₁ and
Dynamic pulses p _{1 and} p 2 are supplied only to Dp ₂ to enable display, and the other displays Dp ₃ and Dp ₄ are prohibited from displaying, but only the displays that are enabled to display It may be configured such that a check signal is input, or only the display device that is in a displayable state is released from the cut-off state.

In the above embodiment, the display devices Dp ₁ and Dp ₂ and the display device
Two adjacent displays, such as Dp ₂ and the display Dp ₃ adjacent to the display Dp ₂ , and display Dp ₃ and the display Dp ₄ adjacent to the display Dp ₃ , are set to be displayable at the same time, Although the display section is configured so as to be checked in three parts, the displays that can be displayed at the same time do not necessarily have to be adjacent, such as displays Dp ₁ and Dp ₃ , for example. Furthermore, the number of partial displays that can be enabled for display at the same time is not limited to two.

In the above embodiment, 10 types of characters from 0 to 9 were used as check characters, and 0 to 9 were sequentially switched and displayed. However, the check characters are not limited to numbers in a fixed order, and are for specific segments. It is sufficient if it is displayed by blinking.

In the above embodiment, the check device is configured to automatically operate for a predetermined period of time immediately after power is turned on.
Timely implementation is also possible.

As described above, according to the checking method of the present invention,
The following effects can be obtained.

a) Since all the digits forming the display section do not display check characters at the same time, the occurrence of misreading is reduced.

b. Since all the digits of the display unit do not display check characters at the same time, operability is improved.

Therefore, it is possible to prevent an erroneous weight value from being displayed due to a defect in the display section.

[Brief explanation of the drawing]

FIG. 1 is a peripheral circuit diagram of a display section for explaining the checking method according to the present invention, and FIGS.
Main part waveform diagrams in the figure and FIGS. 3 a to 3 are explanatory diagrams of other embodiments. Dp ₁ to Dp ₄ ... Display unit, J ... Display data selection section, OSC ₂ ... Specific signal generation section, M ... Program section.

Claims (1)

[Claims] 1. Of the multi-digit segment type display constituting the display unit, a plurality of the multi-digit segment display units are set in a state where a specific check character can be displayed simultaneously, and the check character is displayed. When the input of the check signal corresponding to the predetermined type of check character is completed, the specific check character simultaneously displays at least one of the partial display devices and a predetermined number of the remaining display devices. A method for checking a display section of a weighing machine, characterized by bringing the display into a state where it can be checked, and sequentially setting all the indicators of the display section to a state where a specific check character is displayed.