JP2014163668A - Weighing instrument - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a weighing instrument of which the component cost of an operation key can be reduced and the operability can be improved.SOLUTION: The weighing instrument includes: a weighing dish on which an object to be weighed is placed: a load cell which detects a load applied to the weighing dish; and a CPU 33 which measures a weight of the object to be weighed, on the basis of the load detected by the load cell. The CPU manipulates the weighing instrument in accordance with a load applied to the weighing dish. Further, the CPU manipulates the weighing instrument 1 in the case that a preliminarily set prescribed pattern of load is applied to the weighing dish 20.

Description

  The present invention relates to a technique of a weighing device that measures the weight of an object to be weighed placed on a placement unit.

  2. Description of the Related Art Conventionally, the technology of a weighing device that measures the weight of an object to be weighed placed on a placement unit is well known. For example, as described in Patent Document 1.

  The weighing device described in Patent Document 1 includes a weighing pan (mounting portion) on which an object to be weighed is placed, and a main body portion in which a load cell for detecting a load applied to the weighing pan is included. A display unit and key switches (operation keys) are provided on the front surface of the main body.

  In such a weighing device, the user performs various operations such as adjustment of the zero point, setting of the target weight (upper and lower limit values) of the object to be measured, and setting of tare by pressing the operation key. It can be carried out.

  However, in the weighing device that performs various operations in this manner, there are tendencies that many operation keys are provided depending on the type of operation. Providing a large number of operation keys is disadvantageous in that the cost of parts increases accordingly, and the number of types of operation keys increases and the operability deteriorates (an erroneous operation occurs).

  Further, in order to reduce the size of the weighing device, it is necessary to reduce the operation key arrangement space and the operation key itself, which is disadvantageous in that the operability is further deteriorated.

JP 2012-125676 A

  The present invention has been made in view of the above situation, and a problem to be solved is to provide a weighing device capable of reducing the cost of parts of operation keys and improving operability. That is.

  The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described.

  That is, according to the first aspect of the present invention, the placement portion on which the object to be weighed is placed, the load detection means for detecting the load applied to the placement portion, and the load to be detected based on the load detected by the load detection means. A control device for measuring the weight of the weighing object, wherein the control device is capable of operating the measurement device in accordance with a load applied to the placement unit. .

  According to a second aspect of the present invention, the control means operates the weighing device when a predetermined pattern load set in advance is applied to the mounting portion.

  The operation of the weighing device according to claim 3 includes an operation of switching at least two modes, an operation of adjusting a zero point, including a measurement mode for weighing the object to be weighed and a setting mode for performing various settings. At least one operation is included among an operation for setting a target weight of the object to be weighed, an operation for setting taring, and an operation for switching on / off of the power source.

  According to a fourth aspect of the present invention, the apparatus further includes operation detection means that is provided separately from the placement section and detects an operation performed by a user, and the control means includes a load applied to the operation by the operation detection means and the placement section. The weighing device is operated by a combination.

  The present invention has an effect that the cost of parts of the operation key can be reduced and the operability can be improved.

The perspective view which showed the weighing | measuring device which concerns on one Embodiment of this invention. Similarly, side sectional view. The block diagram which showed the structure regarding control of a weighing device. (A) A time chart showing a detection pattern of an operation for turning on a power supply. (B) A time chart showing a detection pattern of an operation for turning off a power supply. The time chart which showed the detection pattern of operation which switches to setting mode. The figure which showed the hierarchical structure of each item of setting mode. The top view which showed the modification of the measuring apparatus.

  Hereinafter, the front-rear direction, the up-down direction, and the left-right direction are defined according to the arrows shown in the drawing.

  First, a schematic configuration of a weighing device 1 according to an embodiment of the weighing device according to the present invention will be described with reference to FIGS. 1 and 2.

  The weighing device 1 measures the weight of an object to be weighed. The weighing device 1 mainly includes a main body 10 and a weighing pan 20.

  The main body 10 is a main structure of the weighing device 1. The main body 10 mainly includes a housing 11, a dry battery 12, a load cell 14, operation keys 15, a display unit 16, and a control board 17.

  The housing 11 is a member formed in a substantially box shape. The front surface of the housing 11 is formed so as to incline from the rear upper side toward the front lower side.

  The dry battery 12 serves as a power source for the weighing device 1. The dry battery 12 is arranged at the front part in the housing 11. The dry battery 12 is configured to be replaceable from the lower portion (bottom surface) of the housing 11.

  The load cell 14 is an embodiment of a load detection unit according to the present invention, and is a sensor that detects a load. The load cell 14 mainly includes a strain body 14a and a receiving portion 14b.

  The strain body 14a is a member for generating strain by an external force. The strain body 14a is formed in a substantially rectangular parallelepiped shape with its longitudinal direction directed in the front-rear direction, and its front-rear midway part is formed in a hollow shape. The strain body 14 a is disposed at the rear portion in the housing 11, and the rear lower portion of the strain body 14 a is fixed to the housing 11. The strain body 14a is appropriately provided with a strain gauge (not shown) for detecting the strain of the strain body 14a.

  The receiving part 14b is a part fixed to the front end upper part of the strain body 14a. The receiving part 14b protrudes upward from the strain body 14a. The upper end portion of the receiving portion 14 b is extended to the outside (upper) of the housing 11 through an opening formed on the upper surface of the housing 11.

  In the load cell 14 configured as described above, the load can be detected by detecting the strain of the strain generating body 14a caused by the load applied to the receiving portion 14b by the strain gauge.

  The operation key 15 is an operation means for performing an operation related to the weighing device 1. An appropriate number of operation keys 15 are arranged near the left and right ends of the front surface of the housing 11.

  The display unit 16 displays various information related to the weighing device 1. The display unit 16 is disposed at a substantially central portion on the left and right of the front surface of the housing 11.

  The control board 17 is used to control various calculations and storage related to the weighing device 1. On the control board 17, a CPU 33, a memory 34, etc., which will be described later, are arranged. The control board 17 is disposed in the front part in the casing 11 (immediately behind the front surface of the casing 11).

  The weighing pan 20 is an embodiment of the placing portion according to the present invention, and is a substantially rectangular plate-like member. The weighing pan 20 is disposed above the main body 10. A substantially central portion of the lower surface of the weighing pan 20 is fixed and supported on the upper end of the receiving portion 14b of the load cell 14. As a result, the load of the object to be weighed placed on the weighing pan 20 is applied to the receiving portion 14 b of the load cell 14.

  Next, a configuration relating to control of the weighing device 1 will be described with reference to FIG.

  The weighing device 1 includes a load cell 14, an amplifier circuit 31, an A / D converter 32, a CPU 33, a memory 34, a display unit 16, and operation keys 15 as a configuration related to control.

  The analog signal from the load cell 14 is amplified by the amplifier circuit 31 and then converted into a digital signal by the A / D converter 32. The converted digital signal is input to the CPU 33.

  The CPU 33 is an embodiment of the control means according to the present invention, and in accordance with a control program stored in the memory 34, a load applied to the load cell 14 from the received digital signal (and consequently, the load placed on the weighing pan 20). Calculate the weight of the weighing object). The CPU 33 can cause the display unit 16 to display the calculated value. The display is updated every predetermined time interval (a time interval that can be read by the user), and the user can check the weight of the object to be weighed.

  Further, the CPU 33 can display not only the weight of the object to be weighed but also various other information on the display unit 16.

  An operation signal from the operation key 15 is input to the CPU 33, and the CPU 33 performs a predetermined operation (setting, etc.) based on the operation signal.

  Next, a method for operating the weighing device 1 will be described with reference to FIGS. 4 to 6.

  Here, the operation of the weighing device 1 means that the CPU 33 performs various settings related to the weighing device 1 and turns on / off the power in accordance with a user instruction (operation using the weighing pan 20), as exemplified below. means.

  First, referring to FIG. 4, the operation of turning on and off the power of the weighing device 1 (switching between on and off) will be described.

  In a state where the power of the weighing device 1 is off (off), the user can switch the power of the weighing device 1 on (on) by performing a predetermined operation using the weighing pan 20. This will be specifically described below.

  As shown in FIG. 4 (a), when nothing is placed on the weighing pan 20 and the user does not operate (push down or pull up) the weighing pan 20, the load cell 14 The detected load is “0” (see the left end of the graph of FIG. 4A).

  When the user switches on the power supply of the weighing device 1, the user first holds and lifts the weighing pan 20. This reduces the load detected by the load cell 14 to a negative value. In the present embodiment, it is assumed that the load decreases to W2 that is smaller than the threshold value −Wt.

  Here, the threshold value -Wt is a value provided for determining the presence or absence of an operation by the user, and is set to an arbitrary value in advance. Also, Wt is assumed to be a positive value.

  If the user keeps the weighing pan 20 in the raised state, the load detected by the load cell 14 is also kept at W2. The user stops pulling up the weighing pan 20 after 5 seconds or more have elapsed from when the load detected by the load cell 14 falls below -Wt (T1). As a result, the load detected by the load cell 14 becomes zero.

  The user further continues to push down the weighing pan 20. As a result, the load detected by the load cell 14 increases. In the present embodiment, it is assumed that the load increases to W1 that is larger than the threshold value Wt.

  If the user keeps the weighing pan 20 pressed down as it is, the load detected by the load cell 14 is also kept at W1. The user stops pushing down the weighing pan 20 after 5 seconds or more have elapsed from when the load detected by the load cell 14 exceeds Wt (T2). As a result, the load detected by the load cell 14 becomes zero.

  The user performs such a series of operations (operations of pulling down the weighing pan 20 and then pushing it down) within 20 seconds from when the load detected by the load cell 14 falls below -Wt (T1). When the operation is performed, the CPU 33 switches on the power supply of the weighing device 1 so that the weighing device 1 can be used.

  On the other hand, when the power of the weighing device 1 is on, the user can switch the power of the weighing device 1 off by performing a predetermined operation using the weighing pan 20. This will be specifically described below.

  When the power supply of the weighing device 1 is switched off, as shown in FIG. 4B, the user pulls up the weighing pan 20 by hand and sets the load detected by the load cell 14 to a value lower than the threshold value −Wt (for example, W2). ) For 10 seconds or longer. When the operation is performed, the CPU 33 switches off the power supply of the weighing device 1 to make the weighing device 1 unusable.

  As described above, the detection pattern by the load cell 14 required for performing a specific operation (in the above example, an operation for switching the power of the weighing device 1 on or off) is preset and stored in the memory 34. Has been. The user can switch the power supply of the weighing device 1 on or off by changing the load applied to the load cell 14 according to a predetermined pattern set in advance.

  Next, modes that the weighing device 1 has will be described.

  The weighing device 1 has two modes of “weighing mode” and “setting mode”. “Weighing mode” is a mode in which the weighing device 1 measures the weight of an object to be weighed. The “setting mode” is a mode for performing various settings related to the weighing device 1.

  First, the switching operation from the measurement mode to the setting mode will be described with reference to FIG.

  At the time when the power source of the weighing device 1 is switched on, the mode of the weighing device 1 is the weighing mode. In the measurement mode, the weight of the object to be weighed can be measured in a predetermined setting state (initial setting state).

  In this weighing mode, the user can switch the weighing device 1 to the setting mode by performing a predetermined operation using the weighing pan 20. This will be specifically described below.

  When switching the weighing device 1 to the setting mode, as shown in FIG. 5, the user first pulls up the weighing pan 20 by hand and reduces the load detected by the load cell 14 to a value lower than the threshold value −Wt (for example, W2). This state is continued for about 5 seconds (in this embodiment, 5 seconds or more and less than 10 seconds).

  Thereafter, the user pushes down the weighing pan 20 by hand, and continues the state in which the load detected by the load cell 14 is increased to a value higher than the threshold value Wt (for example, W1) for about 5 seconds (5 seconds to less than 10 seconds). .

  Further, the user again raises the weighing pan 20 by hand and reduces the load detected by the load cell 14 to a value lower than the threshold value −Wt (for example, W2) for about 5 seconds (in this embodiment, 5 seconds). Continue for less than 10 seconds).

  The user performs such a series of operations (operations of pushing down the weighing pan 20 and then pulling it up again) within 30 seconds. When the operation is performed, the CPU 33 switches the mode of the weighing device 1 from the measurement mode to the setting mode.

  The CPU 33 switches the mode of the weighing device 1 to the setting mode and causes the display unit 16 to display that effect. Accordingly, the user can recognize that the weighing device 1 has been switched to the setting mode. Thereafter, even when the user releases his / her hand from the weighing pan 20 and the load becomes zero, the weighing device 1 maintains the setting mode.

  Next, details of the setting mode will be described with reference to FIGS. 5 and 6.

  In the setting mode, as shown in FIG. 6, the setting of the target weight (upper and lower limits) (item 1), zero point adjustment (item 2), tare setting (item 3) and other settings (item 4) It can be performed. Below, the selection method of these items is demonstrated first, and the detail of each item is mentioned later.

  When the weighing device 1 is switched to the setting mode, the CPU 33 causes the display unit 16 to display the characters “setting target weight (upper and lower limits)” (item 1). When the user performs a predetermined operation (decision operation) using the weighing pan 20 in this state, the CPU 33 selects (determines) the item 1 and starts setting the target weight (upper and lower limits). When the user performs a predetermined operation (item feed operation) using the weighing pan 20, the CPU 33 displays the next item (that is, “zero point adjustment” (item 2)) on the display unit 16.

  Here, the “decision operation” means that the weighing pan 20 is pulled up, the load detected by the load cell 14 is once reduced to a value lower than the threshold value −Wt (for example, W2), and then the load is made lower than the threshold value −Wt. It is assumed that the operation is a pattern of increasing again to a high value (for example, 0).

  The “item feed operation” is a value in which the weighing pan 20 is pushed down to increase the load detected by the load cell 14 once to a value higher than the threshold Wt (for example, W1), and then the load is lower than the threshold Wt. It is assumed that the operation is a pattern of lowering again (for example, 0).

  When the user performs the determination operation in a state where “zero adjustment” (item 2) is displayed on the display unit 16, the CPU 33 selects the item 2 and starts zero adjustment. Further, when the user performs the item feeding operation, the CPU 33 causes the display unit 16 to display the next item (that is, “setting tare” (item 3)).

  Similarly, each time the user performs the item advance operation, the CPU 33 displays the display unit in the order of item 1, item 2, item 3, item 4 (“other settings”), and item 5 (“end of setting mode”). 16 is displayed. Further, when the user performs the item feeding operation in a state where the item 5 is displayed on the display unit 16, the CPU 33 displays the item 1 on the display unit 16 again.

  As described above, the CPU 33 sets items 1 to 5 as one layer (layer 1), and causes the display unit 16 to sequentially display the items in the layer 1 every time the user performs the item feeding operation.

  Next, details of “setting of target weight (upper and lower limits)” (item 1) will be described.

  When item 1 is selected, the CPU 33 starts setting the target weight (upper and lower limits). Here, the setting of the target weight (upper and lower limits) is to set a target value (target weight) of the weight of the object to be weighed, and more specifically, an allowable range of the target weight of the object to be weighed ( It is to set an upper limit value and a lower limit value.

  When item 1 is selected, the CPU 33 first starts setting the upper limit value of the target weight of the object to be weighed. In this case, the CPU 33 displays that fact and a numerical value “0” on the display unit 16.

  When the user depresses the weighing pan 20 in this state, the CPU 33 increases the numerical value displayed on the display unit 16 according to the load detected by the load cell 14.

  Specifically, when the load detected by the load cell 14 is small (for example, less than a predetermined value Wa (a value greater than 0)), the CPU 33 increases the first digit of the numerical value. When the load detected by the load cell 14 is slightly large (for example, not less than the predetermined value Wa and less than the predetermined value Wb), the CPU 33 increases the second digit of the numerical value. When the load detected by the load cell 14 is larger (for example, it is equal to or greater than the predetermined value Wb), the CPU 33 increases the third digit of the numerical value.

  Thus, the user can change the increasing speed of the numerical value (the increasing amount of the numerical value per unit time) by adjusting the strength of the force that pushes down the weighing pan 20. As a result, the numerical value can be quickly increased to a large value, or the numerical value can be slowly increased to perform fine adjustment. When the user stops pushing down the weighing pan 20, the CPU 33 stops increasing the numerical value at that time.

  On the other hand, when the user pulls up the weighing pan 20 and reduces the load detected by the load cell 14 to a value less than 0, the CPU 33 decreases the numerical value displayed on the display unit 16. When the user stops lifting the weighing pan 20, the CPU 33 stops the decrease in the numerical value at that time.

  If the user detects that the load detected by the load cell 14 is zero and about 5 seconds elapses without pushing down or raising the weighing pan 20, the CPU 33 changes the numerical value displayed on the display unit 16 at that time to Set as the upper limit of the target weight of the object.

  Thereafter, the CPU 33 starts setting the lower limit value of the target weight of the object to be weighed. In this case, the CPU 33 displays that fact and a numerical value “0” on the display unit 16. The setting of the lower limit value is performed by the same operation as the setting of the upper limit value.

  When the allowable range of the target weight of the object to be weighed is set in this way, the CPU 33 switches the weighing device 1 from the setting mode to the weighing mode. When the object to be weighed is placed on the weighing pan 20 in this state, the CPU 33 displays the weight of the object to be weighed on the display unit 16 and whether the weight is higher (overweight) or lower (lighter) than the target weight. Information is also displayed on the display unit 16. By recognizing the information, the user can intuitively adjust the weight of the object to be measured to be within the allowable range of the target weight.

  Next, the details of “zero adjustment” (item 2) will be described.

  When item 2 shown in FIG. 6 is selected, the CPU 33 assumes that the load applied to the load cell 14 is “0” after about 5 seconds, and switches the weighing device 1 from the setting mode to the weighing mode. Therefore, the CPU 33 displays a numerical value “0” on the display unit 16 at the time of switching to the weighing mode. In this way, by performing the zero point adjustment, it is possible to perform the measurement with the load at that time being “0”.

  Next, the details of “setting tare” (item 3) will be described.

  When item 3 is selected, the CPU 33 starts setting the tare. Here, the setting of the taring is to set a weight to be subtracted at the time of taring (the net weight of the object to be weighed is subtracted by subtracting the weight of the object to be weighed).

  When the item 3 is selected, the CPU 33 displays that fact on the display unit 16. The CPU 33 assumes that the load (weight) applied to the load cell 14 at the time when a predetermined time (for example, 10 seconds) has elapsed from the time when the display is performed is the weight of the container of the object to be weighed. The weight is stored in the memory 34. Therefore, the user places an object to be subtracted (the container of the object to be weighed) during the 10 seconds on the weighing pan 20 and stores the weight of the container in the memory 34.

  After performing the above storage, the CPU 33 switches the weighing device 1 from the setting mode to the weighing mode. In this weighing mode, the CPU 33 displays the weight obtained by subtracting the stored weight on the display unit 16. As a result, the display unit 16 displays the net weight obtained by subtracting the weight of the container of the object to be weighed, so that the object to be weighed can be easily measured.

  Next, the details of “other settings” (item 4) will be described.

  When the item 4 is selected, the CPU 33 shifts to the item 4-1 (“setting of the auto-off time”) in the hierarchy (hierarchy 2) that is deeper than the hierarchy 1, and the character “setting of the auto-off time” is selected. Is displayed on the display unit 16.

  In the hierarchy 2, the CPU 33, like the above-described hierarchy 1, every time the user performs the item feeding operation, the items in the hierarchy 2 (items 4-1 and 4-2 ("Brightness of display section") ), Item 4-3 ("buzzer setting") and item 4-4 ("return to previous level")) are displayed on the display unit 16 in order.

  When the user performs the determination operation, the CPU 33 selects an item currently displayed on the display unit 16 and starts the item (setting).

Here, “setting of the auto-off time” (item 4-1) means that the auto-off function of the weighing device 1 (the function of automatically turning off the power when not operated for a certain period of time) is executed. Time setting.
“Setting the brightness of the display unit” (item 4-2) is setting (adjustment) of the brightness of the display unit 16.
“Buzzer setting” (item 4-3) is a setting as to whether or not to use a buzzer (not shown) of the weighing device 1.

  Although detailed description is omitted in the above items 4-1 to 4-3, the user operates (depresses or lifts) the weighing pan 20 in a predetermined pattern as in the case of each item of the hierarchy 1. Or the like), each item can be set.

  When the item 4-4 is selected, the CPU 33 shifts to the previous level (level 1) and displays the item 1 on the display unit 16 again. Thus, the user can arbitrarily move between the hierarchy 1 and the hierarchy 2 by selecting the item 4 of the hierarchy 1 or the item 4-4 of the hierarchy 2.

  Next, the details of “end of setting mode” (item 5) of level 1 will be described.

  When item 5 is selected, the CPU 33 switches the mode of the weighing device 1 from the setting mode to the weighing mode. That is, the user can select item 5 to end the setting mode and measure the weight of the object to be weighed.

  As described above, the weighing device 1 according to the present embodiment includes the weighing pan 20 (mounting unit) on which an object to be weighed is placed, the load cell 14 (load detection means) that detects a load applied to the weighing pan 20, and CPU 33 (control means) that measures the weight of the object to be weighed based on the load detected by the load cell 14, and the CPU 33 measures the weight according to the load applied to the weighing pan 20. The apparatus 1 can be operated.

With this configuration, it is possible to reduce the part cost of the operation key 15 and to improve the operability. That is, although not specifically mentioned in the present embodiment, the operation keys 15 can be reduced to the minimum number (or completely abolished) by enabling various operations using the weighing pan 20. Therefore, the cost of the parts can be reduced. Further, since the weighing pan 20 on which the object to be weighed is larger than the operation key 15, the user can easily operate the weighing pan 20. Furthermore, by reducing the number of operation keys 15, it is possible to suppress the occurrence of erroneous operations (incorrect pressing) of the operation keys 15.
Furthermore, by making various operations possible using the weighing pan 20, it becomes easy to share the operation method among different types of weighing devices. By making the operation method common in this way, it becomes possible for a user of one model to easily operate even when a different type of weighing device is used.

  The CPU 33 operates the weighing device 1 when a predetermined pattern load set in advance is applied to the weighing pan 20.

In this way, by setting a predetermined pattern, it is possible to prevent erroneous operation by the weighing pan 20.
In particular, by setting a pattern that hardly occurs naturally, erroneous operations can be prevented more effectively. For example, a state in which the load detected by the load cell 14 is lower than −Wt is unlikely to occur naturally when the weighing device 1 is used, and a pattern (for example, FIG. 4 (b)) is set in advance to prevent erroneous operation when something is temporarily placed on the weighing pan 20 of the weighing apparatus 1 or when a load is applied. Can do. Further, by setting in advance a more complicated pattern (for example, see FIG. 4A) that combines a state in which the load detected by the load cell 14 is below -Wt and a state above Wt, it is more effective. An erroneous operation by the weighing pan 20 can be prevented.

  Further, the operation of the weighing device 1 includes an operation of switching between two modes of a weighing mode for weighing the object to be weighed and a setting mode for performing various settings, an operation for adjusting a zero point, This includes an operation for setting a target weight, an operation for setting taring, and an operation for switching on / off of the power source.

  In this way, by performing various complicated operations that are likely to cause erroneous operations using the weighing pan 20, it is possible to more effectively suppress the occurrence of erroneous operations.

  In the present embodiment, as shown in FIGS. 1 and 2, the comparatively small measuring device 1 used in a kitchen or the like is illustrated, but the present invention is not limited to this, and various measuring devices are used. The present invention can be applied to an apparatus (an electronic scale that can be operated using a placement unit (weighing pan 20)).

  In the present embodiment, the weighing device 1 has two modes (weighing mode and setting mode). However, the weighing device 1 may have three or more modes.

  In the present embodiment, various items (items 1 to 4 and items 4-1 to 4-3) are set in the setting mode. However, the present invention is not limited to this. . In other words, by operating the weighing pan 20 in a predetermined pattern in the weighing mode (adding a load to the load cell 14), it is possible to directly set the various items without switching the mode.

  In the present embodiment, the items relating to the setting of the weighing device 1 are exemplified as the items of the hierarchy 1 (items 1 to 5) and the hierarchy 2 (items 4-1 to 4-4). The invention is not limited to this, and arbitrary items can be provided in any order. Further, the depth of the hierarchy is not limited to two levels (hierarchy 1 and hierarchy 2) as in the present embodiment, and can be three or more levels.

  Further, in item 1 (setting of target weight (upper and lower limits)) of the present embodiment, the user can change the increasing speed of the numerical value by adjusting the strength of the force to push down the weighing pan 20. However, the present invention is not limited to this, and for example, it is possible to adopt a configuration in which the increasing rate of the numerical value increases every time after the weighing pan 20 is pushed down.

Further, the CPU 33 uses a combination of an operation by means of operation detection means (for example, the operation key 15) provided separately from the weighing pan 20 and an operation by the weighing pan 20 (load applied to the weighing pan 20). A configuration for performing the operation is also possible.
For example, in item 1 (setting of target weight (upper / lower limit)), the CPU 33 increases the numerical value displayed on the display unit 16 when the weighing pan 20 is pressed down, and the weighing pan 20 moves while pressing the predetermined operation key 15. When pressed down, the numerical value displayed on the display unit 16 is decreased. In this way, by combining the operation of the weighing pan 20 and other operation detection means (operation key 15), it is possible to prevent erroneous operation and, depending on the combination method, an operation that is easier than when only the weighing pan 20 is operated. Can be set.

  In the present embodiment, the weighing device 1 has the operation key 15. However, the operation key 15 can be abolished on the assumption that all operations are performed using the weighing pan 20.

In the present embodiment, the user can perform various operations by operating (pushing down or pulling up) the weighing pan 20 according to a predetermined pattern set in advance. It is desirable that the pattern is not strict and is set to have a certain tolerance.
For example, the load detected by the load cell 14 is set not to be maintained for 5 seconds in a state where the load is lower than the threshold value −Wt, but to be maintained for 5 seconds or more and less than 10 seconds. In this case, if the user raises the weighing pan 20 and increases the load again to a value greater than the threshold value −Wt within 5 seconds or more and less than 10 seconds after the load falls below the threshold value −Wt, the CPU 33 performs the detection. The weighing device 1 is operated on the assumption that the pattern matches a predetermined pattern. As described above, by providing a certain allowable range (a time range of 5 seconds or more and less than 10 seconds in the above example), the operation by the user is facilitated.

In this embodiment, one load cell 14 is used. However, it is also possible to use a configuration in which a load is detected using a plurality of load cells 14 and the weighing device 1 is operated based on the detection. is there.
For example, as shown in FIG. 7, the four corners of the weighing pan 20 are supported by the receiving portions 14b, 14b,... Of the four load cells 14, 14,. The load is detected. In such a configuration, for example, when the user pushes down the weighing pan 20 so as to draw a circle on the upper surface of the weighing pan 20 (see the bold arrow in FIG. 7), the CPU 33 causes the load cells 14, 14,. The operation of the weighing pan 20 by the user is detected from the change in the load, and a predetermined setting is made. Thus, by applying a load so as to draw a predetermined figure on the upper surface of the weighing pan 20, a plurality of types of operations can be performed.

1 Weighing device 10 Body 14 Load cell (load detection means)
15 operation keys (operation detection means)
16 Display unit 17 Control board 20 Weighing pan (mounting unit)
33 CPU (control means)

Claims (4)

A placement unit on which an object to be weighed is placed;
Load detecting means for detecting a load applied to the mounting portion, and
Control means for weighing the object to be weighed based on the load detected by the load detection means;
A weighing device comprising:
The control means includes
A weighing device characterized in that the weighing device can be operated in accordance with a load applied to the mounting portion. The control means includes
The weighing device is operated when a load of a predetermined pattern set in advance is applied to the placement unit,
The weighing device according to claim 1. For the operation of the weighing device,
An operation for switching at least two modes, including a measurement mode for weighing the object to be weighed and a setting mode for performing various settings;
Operation to adjust the zero point,
An operation for setting a target weight of the object to be weighed;
Operation to set the tare
Or in the operation to switch the power on / off,
At least one operation is included,
The weighing device according to claim 1 or 2. Provided separately from the above-mentioned mounting part, further comprising an operation detection means for detecting an operation by the user,
The control means includes
The weighing device is operated by a combination of an operation by the operation detection unit and a load applied to the placement unit,
The weighing device according to any one of claims 1 to 3.

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