JP2010122083A - Weighing apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a weighing apparatus capable of reconfirming easily a weighing result in each time, when performing a plurality of times of tare subtraction. <P>SOLUTION: The weighing apparatus 10 includes a tare subtracting function for setting a reference value by performing tare subtraction operation, determining a value acquired by subtracting the reference value from a weighed value, and displaying it on a display part 16. When the tare subtraction operation is performed, a display value on the display part 16 is stored, and when weighing is finished, the stored display value is re-displayed on the display part 16. When re-displaying a plurality of display values, re-displaying is performed in the reverse order or in the normal order of weighing. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a measuring instrument, and more particularly to a measuring instrument such as a kitchen measuring instrument or an electronic balance having an automatic taring function.

  A measuring instrument used in a kitchen or the like is usually provided with a taring function so that a measured value excluding the weight of a container or the like can be displayed. This type of weighing instrument is provided with a switch for erasing the tare. After the tare is placed on the weighing pan, the weight of the tare is memorized by operating the switch and “0” is displayed on the display screen. Is displayed. Then, after erasing the tare, placing the object to be weighed on the tare, the net weight obtained by subtracting the weight of the tare from the total measured value is obtained, and this value is displayed on the display screen. Thereby, the net weight of the object to be weighed can be measured. Such a taring function is particularly effective in a measuring instrument used in a kitchen. When weighing a plurality of materials, the net weight of each material is measured by operating a switch for erasing the tare for each weighing. be able to.

  However, a weighing instrument having a switch for erasing the tare has to be operated for each weighing, and there is a problem that the operation becomes troublesome as the amount of material increases, and a problem that the user forgets to operate the switch.

  In order to solve such a problem, a measuring instrument that automatically performs taring is proposed. For example, the measuring instrument of Patent Document 1 detects the transport of an object to be weighed to a weighing pan with a non-contact switch, and is automatically tared. According to this measuring instrument, since it is not necessary to operate the tare erasing switch for each measurement, it is possible to easily perform the measurement.

In another measuring instrument, taring is automatically performed when a stable state of the measured value continues for a predetermined time. According to this measuring instrument, it is possible to perform taring by simply waiting for a predetermined time without operating the taring switch, and weighing can be performed easily.
JP 7-294322 A

  By the way, when weighing while sequentially adding a plurality of materials, there is a demand for reconfirming the net weight of each material. For example, when a large number of materials are weighed by a kitchen measuring instrument, there is a problem that if taring is performed for each material in sequence, even if one type of material is forgotten to be measured, it will not be noticed. For this reason, when measuring a plurality of materials (that is, when performing a plurality of taring operations), it is necessary to finally check the measurement result of the net weight of each material.

  However, the above-mentioned conventional automatic tare weighing scale cannot reconfirm the measurement result of the net weight of each material. In order to solve this problem, it is necessary to provide a separate display screen and display the net weight of each material. In this case, however, the cost will increase significantly and the equipment will become larger. Therefore, such countermeasures cannot be taken for general-purpose products such as kitchen measuring instruments.

  The present invention has been made in view of such circumstances, and it is an object of the present invention to provide a measuring instrument capable of easily reconfirming the measurement result at each time when a plurality of times of taring are sequentially performed. To do.

  In order to achieve the above object, the invention according to claim 1 sets a reference value by performing a taring operation, obtains a value obtained by subtracting the reference value from a measured value, and displays it on the display unit. A measuring instrument comprising: a weighing instrument that stores a display value of the display unit at the time of the taring operation, and redisplays the stored display value on the display unit at the end of weighing. To do.

  According to the present invention, the display value (that is, the net weight measurement result) is stored at the time of taring operation, and the display value is automatically redisplayed after the measurement is completed, so that all measurement results can be easily reconfirmed. can do. In addition, according to the present invention, since only re-display is performed, it is not necessary to newly provide a display unit, and an increase in cost and an increase in size can be prevented. In the present invention, “at the end of weighing” refers to the time when all objects to be weighed including the tare are removed from the weighing pan at once, and can be determined by detecting that the weighing value has become zero. it can.

  Incidentally, in other words, claim 1 of the present invention relates to a weighing means for obtaining a measurement value, a memory for storing a reference value, a control unit for obtaining a value obtained by subtracting the reference value from the measurement value, and the calculation. A weighing unit comprising: a display unit for displaying the measured value or the measured value; and a taring unit for storing the measured value in the memory as the reference value, wherein the control unit is operated by the tare unit. When the tare is performed, the display value of the display unit is stored in the memory, and the display value is displayed again on the display unit after measurement is completed.

  The invention of claim 2 is characterized in that, in the invention of claim 1, the order of measurement is stored together with the display value, and the display value is redisplayed in an order opposite to the stored order of measurement. To do. According to the present invention, since the display is re-displayed in the reverse order of the measurement order, the latest measurement result can be immediately confirmed.

  A third aspect of the invention is characterized in that, in the first aspect of the invention, the order of measurement is stored together with the display value, and the display value is redisplayed in the stored order of measurement. According to the present invention, since the display values are redisplayed in the order of measurement, the order of measurement can be easily confirmed.

  According to a fourth aspect of the present invention, in the invention according to any one of the first to third aspects, the taring operation is automatically performed when a measured value is stabilized for a predetermined time. According to the present invention, since the tare is automatically performed when the measured value is stabilized for a predetermined time, the operator does not need to perform any special operation. Therefore, for example, even when the operator is working with both hands, the taring operation can be performed simply by waiting for a predetermined time, and continuous weighing can be easily performed.

  According to a fifth aspect of the present invention, in the fourth aspect of the invention, there is provided a mode switching means for switching between an automatic mode in which the taring operation is automatically performed and a manual mode in which the tare is manually performed by a switch. According to the present invention, the automatic mode and manual mode of taring can be selected. When the manual mode is selected, taring can be performed at an arbitrary timing.

  According to the present invention, in the weighing instrument having a tare function, the display value of the display unit is stored at the time of the taring operation, and the stored display value is automatically redisplayed at the end of the weighing. Can be reconfirmed. Therefore, for example, when a large number of materials are weighed with a kitchen measuring instrument, the net weight of each material can be reconfirmed at the end of the weighing, and a metering leak can be prevented.

Hereinafter, preferred embodiments of a measuring instrument according to the present invention will be described with reference to the accompanying drawings.
FIG. 1 is a perspective view showing a measuring instrument 10 according to the first embodiment, and FIG. 2 is a block diagram schematically showing an internal configuration of the measuring instrument 10.

  As shown in FIG. 1, the weighing instrument 10 mainly includes a main body 12 and a weighing pan 14, and a display unit 16, a power switch 18, a tare pulling switch 20, and a mode switch 22 are provided on the front side of the upper surface of the main body 12. ing. The display unit 16 can display a multi-digit number, and the measurement value is digitally displayed on the display unit 16. The power switch 18 is disposed on the left side of the display unit 16, and the power switch 18 is operated to turn on / off the power. The tare pulling switch 20 and the mode changeover switch 22 are arranged side by side on the right side of the display unit 16, and the tare pulling operation is manually performed by operating the tare pulling switch 20, and the mode changeover switch 22 is operated. The operation of switching between “automatic mode” and “manual mode” for taring is performed.

  The weighing pan 14 is disposed on the upper surface of the main body 12. The weighing pan 14 is supported by a load sensor unit 24 (see FIG. 2) such as a load cell provided inside the main body 12. In the present embodiment, as the shape of the weighing pan 14, a substantially rectangular shape is used in a plan view, but the shape of the weighing pan 14 is not limited to this, and a generally circular shape that is generally used, Various modes such as a substantially semicircular shape are possible. In the present embodiment, the weighing pan 14 (weighing unit) is integrated with the main body 12, but a separate type in which the weighing pan 14 (weighing unit) is separated from the main body 12 is also used. Is possible.

  As shown in FIG. 2, a load sensor unit 24, an A / D conversion unit 26, a control unit 28, a memory 30, a power supply 32, and a timer 34 are provided inside the main body 12.

  The memory 30 is a part in which various data are stored. For example, the measured value is stored as the “reference value” in the tare subtraction operation, and is used for the subsequent tare subtraction calculation. Further, the memory 30 stores a display value displayed on the display unit 16 at the time of a tare subtraction operation (or just before the operation). In the case where a plurality of taring operations are performed, “measurement order” is stored together with “display value”.

  The power source 32 is a part that supplies power to each part of the electric system, and for example, a dry battery is used. The power source 32 is connected to the control device 28 and is controlled by the control device 28. A power switch 18 is connected to the control device 28, and by operating the power switch 18, start / stop of power supply (that is, on / off of the power supply 32) is controlled. The type of the power source 32 is not limited to a dry battery, and may be a rechargeable battery, an AC adapter, or a solar battery. Further, the power supply 32 is automatically turned off even when the non-operation state continues for a predetermined time (for example, several minutes).

  The timer 34 is a part that measures the time when the measured value is stable, and is connected to the control device 28. When the measurement value is stable for a predetermined time (for example, several seconds), a tare operation is automatically performed as described later. The timer 34 is also used for time measurement in the non-operation state in the auto power off function.

  The load sensor unit 24 is a part that converts the load received by the weighing pan 14 (see FIG. 1) into an analog signal, and is connected to the control device 28 via the A / D conversion unit 26. Therefore, the analog signal output from the load sensor unit 24 is converted into a digital signal by the A / D conversion unit 26 and then input to the control device 28.

  The control device 28 performs various calculations and controls the operation of each unit based on signals from the A / D conversion unit 26, the timer 34, the power switch 18, the tare pulling switch 20, and the mode changeover switch 22. For example, the control device 28 converts the signal from the A / D conversion unit 26 into a load, and causes the display unit 16 to digitally display the converted value as a measured value. Thereby, normal weighing is performed.

  Further, the control device 28 switches between “manual mode” and “automatic mode” for taring based on the operation of the mode switch 22. In the “manual mode”, the tare pulling operation is performed every time the tare pulling switch 20 is operated. On the other hand, in the “automatic mode”, the taring operation is automatically performed based on signals from the A / D converter 26 and the timer 34. Specifically, when the measured value obtained by the signal of the A / D converter 26 does not change, the time is measured by the signal from the timer 34, and when the measurement time reaches a predetermined time (for example, several seconds). Tare automatically. In both the “manual mode” and the “automatic mode”, the measured value is stored as the “reference value” in the memory 30 during the taring operation, and “0” is displayed on the display unit 16. Further, in the subsequent weighing, the control device 28 compares the “reference value” stored in the memory 30 with the current measurement value, and subtracts the “reference value” from the current measurement value (hereinafter referred to as “net weight”). ")"). Then, the obtained “net weight” is displayed on the display unit 16. Thereby, the measurement result of the net weight can be grasped from the display of the display unit 16.

  In addition, the control device 28 causes the memory 30 to store the display value (that is, the net weight measurement result) on the display unit 16 at the time of the taring operation (or just before the operation). In the case where the tare subtraction operation is performed a plurality of times, the order of measurement is stored in the memory 30 together with the “display value”.

  Further, the control device 28 determines whether or not the measurement has been completed based on the signal from the A / D converter 26 (that is, whether or not the measurement value has become zero). The state where the measurement value has become zero is a state in which all the objects to be weighed have been removed from the weighing pan 14, and therefore it is determined that the measurement has been completed. Then, when the control device 28 determines that the measurement has been completed, the control device 28 causes the display unit 16 to redisplay the “display value” stored in the memory 30. At this time, when a plurality of “display values” are stored in the memory 30, the plurality of display values are continuously performed in a reverse order to the weighing order and at a predetermined time interval (for example, at intervals of 2 seconds). To redisplay. Thereby, the “display value”, that is, the net weight measurement result can be reconfirmed in order.

Next, the control flow of the measuring instrument 10 will be described.
First, the power switch 18 is operated. Thereby, an initial operation such as initialization of the apparatus is performed. At this time, “0” is displayed on the display unit 16 and “0” is set as the “reference value” used in the subsequent calculation.

  Next, the mode is selected by the mode changeover switch 22. That is, the mode changeover switch 22 is operated to select “automatic mode” for taring or “manual mode” without operation. The case where the mode change switch 22 is not operated may be set as “automatic mode”, and the case where the mode change switch 22 or the tare pulling switch 20 is operated may be set as “manual mode”.

  First, the “automatic mode” will be described. In the “automatic mode”, weighing is automatically performed by placing an object to be weighed on the weighing pan 14. At that time, the control device 28 compares the measured value with the “reference value (zero in the first measurement)” stored in the memory 30 and obtains the “net weight” obtained by dividing the reference value from the current measured value. . The value obtained in this way is displayed on the display unit 16.

  Next, the control device 28 determines whether or not to perform “automatic taring”. Specifically, when the measured value is stabilized, time measurement by the timer 34 is started, and it is determined whether or not the stable state has reached a predetermined time (for example, several seconds). If the predetermined time has not been reached, “automatic taring” is not performed, and the process returns to the above-described weighing operation. If the predetermined time is reached, “automatic taring” is performed. In “automatic taring”, the “display value” (that is, the net weight measurement result) at the time of the taring operation is stored in the memory 30 together with the order of measurement, and “0” is displayed on the display unit 16. Further, the measured value at that time is stored in the memory 30 as a “reference value” and used for the subsequent taring calculation. After performing the automatic taring operation in this way, the operation returns to the above-described weighing operation. As a result, when weighing is performed again, the net weight obtained by subtracting the previous weight is displayed on the display unit 16.

  By the way, when the above-described measurement is performed, the control device 28 determines whether or not the measurement has been completed based on the measurement value. That is, it is determined whether or not the measurement value has become zero. If the measurement value has become zero, it is determined that all the objects to be weighed have been removed from the weighing pan 12 and the measurement has been completed. If it is determined that the weighing has been completed, the “display value” stored in the memory 30 is displayed again on the display unit 16. At this time, when a plurality of “display values” are stored in the memory 30, the display is performed again in the reverse order of the weighing order, and a plurality of “display values” are set at predetermined time intervals (for example, at intervals of 2 seconds). ”Is redisplayed continuously. Thereby, all the display values (that is, the net weight measurement result) can be reconfirmed on the display unit 16 after the measurement.

  Next, a case where “manual mode” is selected will be described. In the “manual mode”, the same operation as the “automatic mode” is performed except that the taring operation is manually performed. That is, the weighing is automatically performed by placing an object to be weighed on the weighing pan 14. The control device 28 compares the measured value at that time with the “reference value (zero in the first measurement)” stored in the memory 30, and obtains the “net weight” obtained by dividing the reference value from the current measured value. . Thereby, the obtained value is displayed on the display unit 16.

  When the manual taring operation, that is, when the tare weight cancellation switch 20 is operated, the “display value” of the display unit 16 at that time is stored in the memory 30 together with the order of measurement, and “0” is further displayed on the display unit 16. . Further, the measured value at that time is stored in the memory 30 as a “reference value”, and is used for the subsequent taring operation. After the manual taring operation is performed in this manner, the operation returns to the above-described weighing operation. Thereby, when weighing is performed again, the net weight obtained by subtracting the previous weight is displayed on the display unit 16.

  In the manual mode, as in the automatic mode, “whether measurement has been completed” is determined based on the measurement value. That is, it is determined whether or not the measurement value has become zero. If the measurement value has become zero, it is determined that all the objects to be weighed have been removed from the weighing pan 12 and the measurement has been completed. When it is determined that the measurement has been completed, the “display value” stored in the memory 30 is displayed again on the display unit 16. At this time, when a plurality of “display values” are stored in the memory 30, the display is performed again in the reverse order of the weighing order, and a plurality of “display values” are set at predetermined time intervals (for example, at intervals of 2 seconds). "Is redisplayed continuously. Thereby, all the display values (that is, the net weight measurement result) can be reconfirmed on the display unit 16 after the measurement.

  In the above-described embodiment, only “display value” is displayed as the display after weighing. However, the present invention is not limited to this. For example, the total weighing value may also be displayed. For example, after the measurement is completed, first, the total measured value may be displayed at a predetermined time interval, and then the “display value” may be displayed again. Alternatively, the total measured value may be displayed after the “display value” is redisplayed. Thereby, the total measurement value can be confirmed after measurement.

  In the above-described embodiment, the re-display after weighing is performed in both the “automatic mode” and the “manual mode”. However, the present invention is not limited to this, and the “automatic mode” and the “manual mode” are not limited thereto. Either one of the above may be redisplayed, and the other may be terminated without redisplaying.

  Next, the operation of the weighing instrument 10 configured as described above will be described with reference to FIGS. 3 (a) to 3 (k). The upper part of FIG. 3A to FIG. 3K schematically shows a plan view of the weighing instrument 14 when performing automatic taring, and the lower part shows the display screen of the display unit 16 at that time. Yes.

  FIG. 3A shows a state before the start of measurement. Therefore, “0” is displayed on the display screen of the display unit 16. FIG. 3B shows a state in which a 20 g tare 40 is placed on the weighing pan 14. Therefore, “20” that is the weight of the tare 40 is displayed on the display unit 16. In this state, automatic taring is performed by waiting for a predetermined time (for example, several seconds). That is, “20” is stored in the memory 30 and “0” is displayed on the display unit 16 as shown in FIG.

  FIG. 3D shows a state in which 100 g of the weighing object 42 is placed on the weighing pan 14. At this time, “100” is displayed on the display unit 16 as the value after taring (that is, the net weight of the weighing object 42). In this state, automatic taring is performed by waiting for a predetermined time (for example, several seconds). That is, “100” is stored in the memory 30 and “0” is displayed on the display unit 16 as shown in FIG.

  FIG. 3 (f) shows a state in which 200 g of the weighing object 44 is placed on the weighing pan 14. At this time, “200” is displayed on the display unit 16 as the measured value after taring (that is, the net weight of the object to be weighed 44). In this state, automatic taring is performed by waiting for a predetermined time (for example, several seconds). That is, “200” is stored in the memory 30 and “0” is displayed on the display unit 16 as shown in FIG. Hereinafter, when other objects to be weighed are continuously weighed, these operations (the operations shown in FIGS. 3D and 3E or the operations shown in FIGS. 3F and 3G) are performed. )repeat.

  3 (h) to FIG. 3 (k) show a state in which all the objects to be weighed (the tare 40, the object to be weighed 42, and the object to be weighed 44) are removed from the weighing pan 14 and the weighing is finished. At this time, as shown in FIG. 3 (h), the display unit 16 first displays the net weight “200” of the object 44 weighed during the latest weighing. Next, the net weight “100” of the object 42 weighed during the previous weighing is displayed. Then, the net weight “20” of the tare 40 measured at the time of the first measurement is displayed. Finally, “0” is displayed and the process ends. Therefore, when the weighing is finished, redisplay is performed on the display unit 16 in the order of “200”, “100”, “20”, “0”.

  3 (a) to 3 (k) are examples of addition weighing in which the objects to be weighed 42 and 44 are added to the weighing pan 14, but the weighing method is not limited to this. The present invention can also be applied to subtractive weighing that measures while removing an object to be weighed from the weighing pan 14. For example, after a predetermined amount of an object to be weighed (not shown) made of granular material is placed on the weighing pan 14, the object to be weighed may be removed and weighed while viewing the display value on the display unit 16. In this case as well, the net weight can be measured by taring. Further, the display value (that is, the net weight) when the tare is subtracted is stored, and the stored display value is displayed again on the display unit 16 after the measurement is completed, so that the measurement result can be confirmed after the measurement is completed.

  As described above, in this embodiment, since the measurement results of all the net weights are redisplayed after the measurement, the measurement results of the tare 40, the weighing object 42, and the weighing object 44 can be easily reconfirmed. it can. Therefore, it is possible to prevent the occurrence of measurement leakage even when a large number of measurements are continuously performed.

  In the present embodiment, since the redisplay is performed in the reverse order of the measurement order, the latest measurement result is immediately displayed again, and the latest measurement result can be immediately reconfirmed. In particular, in the automatic mode, the display is zeroed by automatically performing the tare, but according to the present embodiment, the latest measurement result can be reconfirmed immediately.

  Furthermore, since the measuring instrument 10 according to the present embodiment only performs re-display on the display unit 16b, it is not necessary to increase the display unit 16, and an increase in cost and size can be prevented.

  In the embodiment described above, the redisplay is performed in the reverse order of the weighing order. However, the redisplay may be performed according to the weighing order. That is, in the example shown in FIGS. 3A to 3K, the images may be redisplayed in the order of “20”, “100”, and “200”. In this case, the work order can be easily reconfirmed. Further, the redisplay order may be selected. For example, a selection switch for selecting a process for redisplaying in the order of measurement and a process for redisplaying in the reverse order of measurement may be provided so that the order of redisplay can be selected. In that case, a function for recognizing which order is selected, for example, a lamp indicating the redisplay order is provided on the main body 12 to light it, or a display indicating the redisplay order is displayed on the display unit 16. May be.

  Further, a display function may be provided so that the weighing sequence itself (that is, how many times taring is performed) can be understood. For example, when performing taring, the number of taring times (first time, second time, third time,...) Is stored, and when the display is redisplayed, how many times the displayed value is tared. You may make it display on the display part 16 simultaneously. Thereby, the order of measurement and the display value can be reconfirmed at the same time.

  Furthermore, a function may be provided in which a specific number of tares are recognized and distinguished from other tares. For example, the first taring (or the first and second taring) may be specially recognized as a “tare” such as a dish. In this case, the total measured value of a plurality of materials (that is, a value excluding only “tare” such as a dish) can be obtained as necessary. The obtained “total measured value of a plurality of materials” may be displayed on the display unit 16 at the end of measurement or when a predetermined switch is operated.

  In addition, arrangement | positioning of the display part 16, the power switch 18, the tare pulling switch 20, and the mode switch 22 is not limited to the above-mentioned example, Various aspects are possible. For example, the mode switch 22 may be provided on the side surface or the back surface of the main body 12 as a slide type switch.

  Further, the number of switches and the function assigned to each switch are not limited to the above example, and various modes are possible. For example, as shown in FIG. 4 showing a weighing instrument 50 according to another embodiment, a mode in which only the power switch 18 and the tare pulling switch 20 are provided as operation switches and the mode changeover switch is omitted is also possible. In this case, the function of the mode changeover switch 22 may be distributed to the tare pulling switch 20 and the power switch 18. For example, the mode may be switched by long-pressing the tare pulling switch 20, or the mode may be switched by simultaneously pressing the tare pulling switch 20 and the power switch 18.

The perspective view which shows the measuring instrument of embodiment Block diagram schematically showing the internal configuration of the measuring instrument Explanatory drawing showing the action of the measuring instrument The perspective view which shows the measuring device of other embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Measuring device, 12 ... Main body, 14 ... Weighing pan, 16 ... Display part, 18 ... Power switch, 20 ... Tare pulling switch, 22 ... Mode changeover switch, 24 ... Load sensor part, 26 ... A / D conversion part, 28 ... Control unit, 30 ... Memory, 32 ... Power supply, 34 ... Timer, 40 ... Tare, 42 ... Measurement object, 44 ... Measurement object

Claims (5)

In a measuring instrument having a tare function for setting a reference value by performing a tare operation, obtaining a value obtained by subtracting the reference value from a measured value, and displaying the value on a display unit.
At the time of the taring operation, the display value of the display unit is stored,
A measuring instrument characterized by redisplaying the stored display value on the display unit at the end of measurement. The order of weighing is stored together with the display value,
2. The measuring instrument according to claim 1, wherein the display value is redisplayed in an order opposite to the stored order of weighing. The order of weighing is stored together with the display value,
The measuring instrument according to claim 1, wherein the display value is displayed again in the stored order of measurement.   The measuring instrument according to any one of claims 1 to 3, wherein the taring operation is automatically performed when a measurement value is stabilized for a predetermined time.   5. The measuring instrument according to claim 4, further comprising mode switching means for switching between an automatic mode in which the taring operation is automatically performed and a manual mode in which the tare is manually performed by a switch.

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