JP5830617B2 - Weighing device - Google Patents

Description

  The present invention relates to a weighing device used for selling meat, side dishes, and the like.

  As is well known, the output sensitivity and the zero point output of a load cell as a weight sensor change according to changes in ambient temperature. Therefore, in a weighing device in which a load cell is incorporated, for example, a temperature compensation resistor is connected to the output circuit of the load cell (see Patent Document 1), or auto-tracking that automatically updates the zero point at no load is used (Patent Document). 2), the temperature in the casing is detected, and an attempt is made to reduce the influence of temperature drift by multiplying the output of the load cell by a correction coefficient (see Patent Document 3).

  On the other hand, in a face-to-face sales corner such as a supermarket, there is a face-to-face weighing and printing device that weighs products such as meat and side dishes, calculates the price by multiplying the obtained product weight by the unit price, and prints them on labels and receipts. Although used, in such a weighing device, as disclosed in Patent Documents 4 to 6 below, a load cell that dislikes temperature change, a power supply circuit that generates heat when energized, a printer, and the like are housed together in the main body case. Therefore, the load cell accommodated therein requires particularly careful temperature compensation.

Japanese Patent No. 3534205 Japanese Patent No. 3568609 JP 2008-64497 A JP 2002-310776 A Japanese Patent No. 4449310 JP 2009-14455 A

  For this reason, the load cell mounted on this type of weighing device has a problem of high manufacturing cost because it needs to perform advanced temperature compensation. Further, since the power supply circuit, the load cell, the circuit board, the printer, and the like are accommodated in the main body case, there is a problem that the main body case cannot be made compact. Furthermore, when the inside of the main body case is cooled by a cooling fan, there is a problem that the output of the load cell becomes unstable due to the influence of wind.

  An object of the present invention is to provide an inexpensive weighing device that can solve all of these problems.

  In order to solve the above problems, a weighing printer as an example of this embodiment includes a load cell that outputs the weight of an object to be weighed loaded on a weighing pan as an analog signal, and a digital weight obtained by performing signal processing on the output of the load cell. A circuit for outputting a signal, a control unit for inputting the digital weight signal and outputting print data, a printer for printing a predetermined item on a label or a receipt based on the print data, at least the control unit and the printer A metering printing apparatus comprising a power supply circuit for supplying power to each other and a case for storing them, wherein the case is separated into two upper and lower stacked layers, and the lower case includes a control unit and a printer. And a power circuit, and at least a load cell and a circuit unit are housed in the upper case.

  According to this configuration, the power supply circuit that cannot avoid the temperature rise is physically separated from the load cell that does not like the temperature rise, and the influence on the load cell due to the heat generation of the power supply circuit is eliminated. You can stop at anything. In addition, since the load cell and the power supply circuit that are stored side by side in one case are stored separately in the upper case and the lower case, the width of the case itself can be reduced. In addition, since the cooling fan for cooling the power supply circuit is housed in the lower case in which the load cell is not housed, the influence of wind on the load cell by the cooling fan can be eliminated.

  In addition, the weighing printer as an example of the present embodiment has an upper case that is covered with a metal base member having legs, a non-contact state on the base member, and a weighing pan placed thereon. It is also possible to have a configuration in which both of these members are vertically connected via a load cell.

  According to this configuration, even if the temperature in the lower case rises, the upper case separated from the upper case is made of a metal member having excellent thermal conductivity and is always exposed to the room, so Maintained. Therefore, since the load cell and the circuit portion surrounded by these metal members are also maintained at a slowly changing room temperature, temperature compensation for the load cell can be kept to a slight level.

  In addition, the weighing printer as an example of the present embodiment, the upper case is provided with a battery that supplies power to the load cell and the circuit unit, and a transmission unit that wirelessly transmits a digital weight signal output from the circuit unit, The lower case may be provided with a receiving unit that wirelessly receives the digital weight signal and outputs it to the control unit.

  According to this configuration, since the weight signal can be transmitted wirelessly from the separated upper case to the lower case, the upper case on which the weighing pan is placed can be moved to a convenient location and used. . Moreover, the upper case can be made as thin as possible by using a short load cell, so if such a thin upper case is placed on the showcase, it can be placed on a weighing pan such as meat or prepared dishes. There is an advantage that it is easy to unload.

  In addition, the weighing printer as an example of the present embodiment, the battery is a rechargeable secondary battery, and when the upper case is placed on the lower case, the secondary battery is electrically connected to the power circuit. It may be configured to be supplied with power.

  According to this configuration, the upper case and the lower case can be used separately when in use, and the secondary battery can be charged by simply stacking the upper case on the lower case when not in use. Therefore, it is not necessary to mount a large-capacity battery that can withstand long-term use, so that the upper case can be made more compact.

  Moreover, the measurement printing apparatus as an example of the present embodiment may have a configuration in which a wireless power feeding apparatus that wirelessly supplies power to the secondary battery from the power supply circuit is provided.

  According to this configuration, since the secondary battery can be charged wirelessly, the upper case and the lower case can be freely separated and coupled. Therefore, since the arrangement configuration of each case can be freely changed according to the place of use, versatility as a weighing printer is increased.

  In addition, a touch panel capable of operating the device is attached to the store side surface of the lower case in the weighing printing apparatus as an example of the present embodiment, and a product name, weight, price on the customer side surface facing the touch panel. In addition, a display unit for displaying the printer label may be provided, and a label or receipt issuing port of the printer may be faced on the upper back side of the touch panel.

  According to this configuration, since the touch panel can be arranged on the front surface of the printer, the horizontal width of the touch panel can be expanded to the full width of the lower case. In the conventional device, since the printer issue port was arranged side by side on the touch panel, the width of the main body case was wide. In this invention device, the printer issue port is located on the back of the touch panel. The width of the case can be made more compact.

  In addition, the measurement printing apparatus as an example of the present embodiment may be configured such that when the touch panel is flipped up, a cassette insertion gate provided on the front surface of the printer is opened in conjunction with the flip-up operation.

  According to this configuration, just by flipping up the touch panel, the cassette loading gate of the printer can be opened and the cassette can be loaded and unloaded, making it easy to load and unload the cassette and easily replace labels and receipts stored there. become.

  The weighing printer as an example of the present embodiment may be configured such that a pole is erected on the customer side surface of the lower case, and a display unit for displaying the product name, weight, and price is provided on the pole. .

  According to this configuration, even if the weighing printing device is installed in a relatively low place such as a cooking table or table, the display can be raised to a height that makes it easy to see the display. It can also correspond to the form.

  According to the present invention, the temperature compensation for the load cell can be kept to a slight level that can suppress the influence of a change in room temperature, and therefore, an inexpensive weighing device that can suppress the manufacturing cost can be provided. Further, since the lateral width of the apparatus can be made more compact than that of the conventional apparatus, there is an advantage that even if it is installed on a showcase and used, it takes less space than the conventional apparatus. In addition, the thin upper case on which the weighing pan is placed can be used separately from the thick lower case in which the power circuit is stored, so if only the thin upper case is installed on the showcase, the weighing pan This makes it easier to load and unload objects to and from. In addition, even if a fan for cooling the power supply circuit is provided, the influence of wind on the load cell by the cooling fan can be completely eliminated.

1 shows an external perspective view of a weighing printer according to an embodiment of the present invention. Sectional drawing seen from the aa direction in the upper case of FIG. 1 is shown. The external appearance perspective view when a weighing pan is removed from the upper case is shown. The top view when the upper cover of the lower case is removed and the inside of the lower case is viewed is shown. The external appearance perspective view of the state which flipped up the touch panel of a lower case front is shown. The principal part perspective view of the locking mechanism of a cassette insertion gate is shown. The external appearance perspective view which looked at the lower case of the embodiment from the customer side is shown. The external appearance perspective view of the measurement printing apparatus which concerns on other embodiment of this invention is shown. The external appearance perspective view of the measurement printing apparatus which concerns on other embodiment of this invention is shown. The block diagram of the measurement printing apparatus which concerns on these embodiments is shown. The block diagram of the wireless electric power feeder used by the said embodiment is shown. The block diagram of the load cell accommodated in an upper case and a circuit part is shown.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 shows an external perspective view of a weighing printer A according to an embodiment of the present invention. In particular, this figure shows a state where an upper case 100 on which a weighing pan B is placed is lowered from a lower case 200. ing. In FIG. 1, a weighing printer A includes a lower case 200 having a touch panel 300 attached to the front surface and a customer side display unit 310 attached to the rear surface, and an upper case 100 having a weighing pan B placed thereon. These cases 100 and 200 are separable, and the upper case 100 can be stacked on the lower case 200.

  As shown in the cross-sectional view of FIG. 2, the upper case 100 includes a metal base member 102 provided with legs 101 and a metal dish receiving member 103 that covers the base member 102 in a non-contact state. These two members 102 and 103 are connected vertically via a load cell 400. A metal weighing pan B is placed on the upper surface of the plate receiving member 103.

  As shown in FIG. 3, the base member 102 has a rectangular shape as a whole, and bosses 104 with female screws are formed at the four corners. The female screws of the bosses 104 are connected to the legs 101. The shaft bolt is screwed, and the level of the base member 102 can be adjusted by adjusting the screwing amount. Further, as shown in FIG. 2, a reinforcing rib 105 surrounding the periphery of the load cell 400 and a reinforcing rib (not shown) extending from the periphery of the load cell 400 are formed on the upper surface of the base member 102. A washer-like boss portion 106 is formed on the load cell mounting surface 102, and a bolt 107 is screwed into a female screw that penetrates the boss portion 106 to fix the load cell 400 to the base member 102.

  As shown in FIG. 3, the dish receiving member 103 has a rectangular shape as a whole, and its four corners are cut into an arc shape so as not to interfere with the boss portions 104, and the horizontal bracket 108 is formed on the cut surface. Is provided. The bracket 108 is provided with a screw hole, and an adjustment bolt (not shown) serving as a stopper is screwed into the bracket 108. By adjusting the distance between the front end of the bolt and the base member 102, the dish receiving member 103 is excessively depressed. It can be regulated by adjusting bolts. Further, rubber bushes 109 for inserting pins provided on the back surface of the weighing pan B are attached to the upper surface of the plate receiving member 103, and the offset error of the load cell 400 is corrected at the center. A tool insertion window 110 is provided. Beside that, a bolt mounting window 111 for fixing the tray receiving member 103 to the load cell 400, an operation window 113 for operating the span adjustment screw 112, and a circuit board 114 ( A window 116 for allowing the electronic component 115 of the circuit part 140) of FIG. 10 to escape and a viewing window 117 for looking into the level 120 are provided. Then, when covering the weighing pan B, as shown in FIG. 2, the action material 130 is spread over the upper surface of the tray receiving member 103, and the weighing pan B is covered from above to fix the weighing pan 130 to the tray receiving member 103.

  A reinforcing rib 118 that fits in a non-contact state with the rib 105 of the base member 102 is provided on the back surface of the dish receiving member 103. The span adjustment window 113 is covered with a sealing cover 119. FIG. 3 shows a state in which the cover 119 is extended to the bolt attachment window 111 and attached. Furthermore, the level 120 for checking the level of the base member 102 is attached to the base member 102, and the tray receiving member 103 is provided with a through-hole 117 that fits in a non-contact state with the level 120, and the weighing The pan B is provided with a peep window 121 (see FIG. 1) for peeping through the level 120. Furthermore, on the back side of the base member 102, a space for storing the battery 160 in FIG. 10 and a space for storing the circuit board (the transmission unit 150 in FIG. 10) on which the wireless module is mounted are provided.

  As shown in FIG. 2, the load cell 400 has a well-known structure in which a strain gauge is attached to the upper and lower strain sensing parts 401 that are thinned by piercing the center part into glasses. In this embodiment, the load cell 400 is made as flat as possible so that the thickness of the entire upper case 100 is reduced. The left fixed portion 402 toward the load cell 400 is fixed to the base member 102 with bolts 107, the right movable portion 403 is fixed to the plate receiving member 103 with bolts 122, and the plate receiving member 103 is interposed via the load cell 400. The base member 102 is supported in a floating state. Further, a washer-like boss 123 is formed on the lower surface of the dish receiving member 103 fixed to the movable portion 403, and the bolts 107, 122 are formed by the boss 123 and the boss 106 formed on the base member 102. The effect on the strain gauge due to tightening is reduced.

  The movable portion 403 of the load cell 400 is provided with a step portion that is one step lower than the strain sensing portion 401 so that the head of the bolt 122 fits in the lower case 100. Further, a moisture-proof agent 404 is attached to the upper and lower surfaces of the strain sensing part 401 to which the strain gauge is attached. The base member 102 close to the movable part 403 is provided with a screw hole penetrating vertically, and a stopper bolt 124 is screwed into the screw hole from the bottom surface, and the movable member 403 is adjusted by adjusting the screwing amount. The part 403 is restricted from sinking excessively.

  FIG. 4 shows the arrangement of each device inside with the upper cover of the lower case 200 removed. A cassette type printer 500 (a portion surrounded by a broken line) is arranged on the right half of the device. A drive motor 501 and a power connector 201 of the printer 500 are arranged on the left side, a circuit board 202 on which a computer is mounted is arranged on the left side, and a speaker 203 and a wireless communication module are further arranged on the left side. Is mounted on the circuit board 204, and a power supply circuit 205 and a cooling fan 206 for cooling the power circuit 205 are disposed on the left side of the circuit board 204. An antenna 207 extending from the circuit board 204 of the wireless module to the outside through the back surface of the lower case 200 is connected to the circuit board 204 of the wireless module.

  The printer 500 includes a cassette 502 that can be inserted into and removed from the printer body. The cassette 502 has a holder 504 on which a roll 503 of a label and a receipt 570 (see FIG. 1) is mounted, and a take-up roller that winds up a label mount. 505 and a printing roller 506 are provided. When the cassette 502 is inserted into the printer main body, the driving gears 507 of the driving motor 501 and the driving gears of the take-up roller 505 and the printing roller 506 are engaged with each other via a gear train so that the rotational force is transmitted. .

  Since such a configuration is well known, a detailed description thereof will be omitted, but a touch panel 300 is provided on the side where the cassette 502 is inserted and removed (front surface). Therefore, in this embodiment, as shown in FIG. When the front touch panel 300 is flipped up, the gate 508 for inserting the cassette 502 is unlocked in conjunction with this, and the gate 508 is opened downward. Inside the gate 508, a thermal head 509 is attached to the tip, and a lock mechanism is provided below the gate 508. When the opened gate 508 is returned to its original position, the thermal head 509 is brought into close contact with the print roller 506. At the same time, the lock mechanism works to hold the gate 508 in a closed position. In the printer 500, the label and receipt 570 are provided at the front end portion of the closed gate 508, and the label and receipt 570 are issued in a posture inclined forward at an angle of 35 degrees with respect to the vertical plane. I am doing so. Accordingly, as shown in FIGS. 1 and 9, the issued label or receipt 570 does not interfere with the touch panel 300. Further, contact with the weighing pan B behind the issuing port 580 can also be prevented. FIG. 5 shows a state in which the upper case 100 on which the weighing pan B is placed is stacked on the lower case 200. A power switch 207 is provided on the front side of the lower case 200 where the touch panel 300 is flipped up, and a reset switch 208 is provided above the power switch 207.

  6 is a perspective view of the lock mechanism 550 of the gate 508. Since the touch panel 300 is integrally connected to the shaft 306 via the arm 304 of FIG. 4, when the touch panel 300 is flipped up, FIG. In conjunction with this, the shaft 306 rotates in the arrow direction d, and the hook 551 fixed to the end of the shaft 306 rotates in the same direction d to rotate the lever 552 in the arrow direction e. Then, the lever 552 rotates in the arrow direction e around the rotation shaft 553 and hits the bent portion 555 of the plate 554, and further rotates the bent portion 555 in the arrow direction e around the rotation shaft 553. Then, the arc-shaped hook 556 provided on the plate 554 is detached from the pin 557. Such a mechanism composed of the plate 554 and the pin 557 is also provided on the facing side, and since both the plates 554 are connected by the connecting plate 558, the same rotational movement occurs on the facing side, and the hook 556 is connected to the pin 557. Deviate from.

  On the other hand, the pins 557 on both sides are fixed to the frame of the lower case 200, and the gate 508 is configured to rotate in the arrow direction f around the shaft 513 provided at the lower end of the panel 511. Therefore, while the hook 556 is engaged with the pin 557, the rotation radius of the hook 556 around the rotation axis 553 is smaller than the rotation radius of the gate 508 around the axis 513. Rotation around 513 is blocked by pin 557. However, when the hook 556 is released from the pin 557, the blocking by the pin 557 is released, so that the gate 508 is rotated about the shaft 513 in the arrow direction f and released. The connecting plate 558 is provided with a manual lever 559 that extends downward, and this lever 559 faces the operation window 560 on the front surface of the gate 508 shown in FIGS. When the manual lever 559 is pushed, the hook 556 is similarly detached from the pin 557. Further, a thermal head 509 is attached to the front end 510 of the frame in FIG. 6, and a bent portion 512 is provided in the panel 511 below it, and the back surface of the front cover of the gate 508 is fixed to the bent portion 512. It has become so.

  Returning to FIG. 4, the touch panel 300 is attached to the upper part of the front surface of the lower case 200 via two tilt mechanisms 301 and 302. In the first tilt mechanism 301, the touch panel 300 rotates at an arbitrary angle with respect to the arm 304 around the rotation shaft 303 provided on the back surface of the touch panel 300, and thereby the tilt angle of the touch panel 300 can be freely set. It can be changed. The second tilt mechanism 302 is a combination of the flip-up operation of the touch panel 300 and the opening movement of the cassette insertion gate 508, and the arm 304 is attached to the bracket 308 on the shaft 306 provided on the upper front surface of the lower case 200. When the touch panel 300 is flipped up, the arm 304 and the bracket 308 are rotated around the shaft 306 in accordance with the flip-up operation, thereby causing the touch panel 300 to jump up to the state shown in FIG. It has become. A friction mechanism is incorporated in the rotation shaft 303 of the first tilt mechanism 301 so that the tilting posture of the touch panel 300 is held at an arbitrary angle. In addition, a torque limiter 307 is provided at the left end of the shaft 306 so that the touch panel 300 is held in a raised position. A hook 551 in FIG. 6 is fixed to the right end of the shaft 306, and the hook 551 rotates in conjunction with the flip-up movement of the touch panel 300. In FIG. 5, the tilt mechanism 301 is covered with the cover 308, but in FIG. 4, it is shown with the cover removed.

  On the touch panel 300, various function keys for operating the printer 500 and the weighing device are displayed. In addition, operation messages, product information read from the memory 230 (see FIG. 10), and the like are switched on the screen. Although displayed, a similar display unit 310 is provided on the back side of the lower case 200, that is, on the customer side surface. FIG. 7 shows a perspective view of the lower case 200 as viewed from the customer side. On the side of the customer side, a display unit 310 for displaying the product name, weight, price, promotional characters, etc. of the object to be weighed is attached. It has been.

  FIG. 8 shows a metering printing apparatus according to another embodiment. In this embodiment, a pole mounting portion 320 is provided on the customer side surface of the lower case 200, and tip portions of a pair of poles 321 erected there. The touch panel 300 and the customer side display unit 310 are attached to the touch panel.

  FIG. 9 shows a weighing printer according to still another embodiment. In this embodiment, a touch panel 300 is attached to the front surface of the lower case 200, while a customer 321 is attached to the front ends of a pair of poles 321. A side display unit 310 is attached. The weighing pan B according to this embodiment is formed wider than the weighing pan B shown in FIG. Therefore, a handle 150 as a handle is attached to the base member 102 of the upper case 100.

  FIG. 10 shows a block diagram of each device incorporated in each of the above embodiments. In this figure, the upper case 100 includes a load cell 400, a circuit unit 140 that performs signal processing on the analog output of the load cell and outputs a digital signal, a transmission unit 150 that wirelessly transmits the digital output of the circuit unit 140, A battery 160 for supplying power to each of these devices is housed. Meanwhile, the lower case 200 includes a receiving unit 210 that receives a signal transmitted from the transmitting unit 150, a weight signal output from the receiving unit 210, and product information read from the memory 230 by operating the touch panel 300. A control unit 220 including a microcomputer that generates display data and print data based on the printer, a printer 500 that inputs print data and prints on a label or a receipt, and a power supply circuit 240 that supplies power to these devices. Has been. Further, the touch panel 300 and the customer display unit 310 are externally attached to the lower case 200, and display data is transmitted from the control unit 220 to the lower case 200, and power is supplied from the power supply circuit 240. The product name, weight, price, message, etc. are displayed on the screen.

  As the battery 160, a dry battery is used, but a rechargeable secondary battery can also be used. In this case, for example, an electromagnetic induction type wireless power feeder 250 is attached. As shown in FIG. 11, the power supply apparatus 250 converts a direct current output from the power supply circuit 240 into a high frequency by an inverter 251, sends the high frequency current to the primary coil 252, and excites a high frequency current in the secondary coil 253 by electromagnetic induction. . The voltage is converted into direct current by the converter 254 and then the specified voltage is supplied to the battery 160. When this power feeding device 250 is used, the inverter 251 and the primary coil 252 are housed on the back surface of the upper cover of the lower case 200, and the secondary coil 253 and the converter 254 are housed in close proximity to the upper case 100. In this way, the secondary battery can be charged simply by overlapping the upper case 100 on the specified position of the lower case 200.

  FIG. 12 shows the configuration of the bridge circuit 410 and the circuit unit 140 of the load cell 400. As the strain gauges R1, R2, R3, and R4 used in the load cell 400, the strain sensing unit 401 caused by the temperature change is shown. A compensated strain gauge that compensates for thermal expansion and changes in Young's modulus is used. The strain gauges R 1, R 2, R 3, and R 4 form a bridge circuit 410, and the analog output is amplified by a preamplifier 141, and then converted into a digital quantity by a sigma delta A / D converter 142. Then, the noise component is filtered and output to the transmission unit 150 as a digital weight signal. In addition, a specified voltage is supplied from the battery 160 to each of these devices. The circuit unit 140 includes a preamplifier 141, an A / D converter 142, and a microcomputer 143.

  On the other hand, the digital weight signal transmitted from the transmission unit 150 is received by the reception unit 210 in the lower case 200 and output to the control unit 220. The control unit 220 reads the unit price of the designated product from the memory 230, calculates the price based on the read unit price and the product weight input from the receiving unit 220, and displays the calculated price and the read product information on the customer side display unit. 310 and the touch panel 300. Product information and messages such as product names and unit prices of all products handled are registered in the memory 230, and when the touch panel 300 is operated, such information is read and displayed on the touch panel 300 or the customer side display unit 310. It has come to be.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to these embodiment, Aspects other than this are also employable. For example, in FIG. 10, the transmission unit 150 and the reception unit 210 are provided to transmit the weight signal wirelessly, but instead, the digital weight signal is transmitted from the circuit unit 140 to the control unit 220 via a cable. You may do it. At that time, it is also possible to supply power from the power supply circuit 240 to the battery 160 with a cable. Further, power may be supplied directly from the power supply circuit 240 to each device in the upper case 100 without using the battery 160. Further, without using the wireless power supply apparatus 250, for example, when a connector is attached at a position facing the bottom surface of the upper case 100 and the upper lid of the lower case 200 and the upper case 100 is stacked on the lower case 200, the connector is connected. Accordingly, the battery 160 may be supplied with power. Furthermore, in FIG. 12, a self-temperature compensation type strain gauge or a temperature sensitivity compensation type strain gauge is used. In addition, a temperature sensor is incorporated in the bridge circuit, and the zero point that changes according to room temperature is compensated by software. If the function to be incorporated is incorporated in the microcomputer 143, it is not necessary to perform hardware compensation, so that a cheaper and more accurate weighing device can be obtained.

A Weighing printer
B Weighing pan 100 Upper case 101 Leg portion 102 Base member 103 Dish receiving member 140 Circuit portion 150 Transmitter 160 Battery 200 Lower case 210 Receiving portion 220 Control portion 230 Memory 240 Power supply circuit 250 Wireless power supply device 300 Touch panel 310 Customer side display portion 321 Paul 400 Load cell 500 Printer 508 Cassette insertion gate (gate)
570 Label or receipt 580 Issuer

Claims (5)

A load cell that outputs the weight of the object to be weighed loaded on the weighing pan as an analog signal, a circuit unit that processes the output of the load cell and outputs a digital weight signal, acquires the digital weight signal, and acquires the digital A weighing device comprising: a control unit that processes a signal; a power supply circuit that supplies power to at least the control unit; and a case that houses these,
The case is composed of a lower case and an upper case,
The lower case and the upper case are physically and electrically separated and can be stacked in at least two stages,
The lower case houses at least the control unit and the power supply circuit,
The upper case is a weighing device that houses at least the load cell and the circuit unit. A load cell that outputs the weight of the object to be weighed loaded on the weighing pan as an analog signal, a circuit unit that processes the output of the load cell and outputs a digital weight signal, acquires the digital weight signal, and acquires the digital A weighing device comprising: a control unit that processes a weight signal; a power supply circuit that supplies power to at least the control unit; and a case that houses these,
The case is composed of a lower case and an upper case,
The lower case and the upper case are configured as physically separate cases, and can be stacked in at least two stages.
The lower case houses at least the control unit and the power supply circuit,
The upper case is a weighing device that houses at least the load cell and the circuit unit. Said upper case, said load cell, weighing apparatus according to claim 1 or claim 2, at least accommodating the battery for supplying at least power to the circuit portion and the circuit portion.
The circuit unit is (1) when the upper case and the lower case are connected by a wired cable, the digital weight signal is stored in the control unit that is stored in the lower case using at least the wired cable. A first output mode capable of outputting; (2) when the upper case and the lower case are not connected using the wired cable but are connected using wireless communication, the digital weight signal is transmitted wirelessly; The weighing device according to any one of claims 1 to 3, wherein a second output mode for outputting to the control unit housed in the lower case by communication can be executed. The upper case executes a first drive state in which the upper case is driven while receiving power supply from the outside, and a second drive state in which the upper case is driven by the battery housed in the upper case without receiving power supply from the outside. The weighing device according to claim 3, which can be made.