JPS59155723A - Electronic balance - Google Patents

Abstract

PURPOSE:To prevent the deviation of a zero point generated when load is acted on a balance part for a long time, in an electric balance having the balance part comprising a load cell, by operating an alarm when a definite time is elapsed in such a state that load is applied to the balance part in a definite value or more. CONSTITUTION:Clock start F judges wether the clock 4a connected to CPU1 is started or not and, when the clock start F is zero, a set alarm generating wt. A and data B are read and compared. When the data B of a balance part 2 is smaller than the alarm generating wt. A, it is returned to a main routine as it is and, when the data B is larger, the clock 4a is started and the clock start F is set to read an alarm generating time (a). That is, when the clock start F has been set, the comparison with the alarm generating time (a) is performed and, when the alarm generating wt. A does not reach the time (a), the data C of the balance part 2 is read and, when the data C is larger than the alarm generating wt. A, it is returned to the main routine. As mentioned above, a wt. exceeding a definite value is applied to the balance part comprising a load cell and, when the load applying time exceeds a definite time, an alarm is operated. As a result, the long-time application of load to the load cell can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field of the Invention The present invention relates to an electronic scale having a weighing section using a load cell.

Technical Background and Problems In general, if you leave an object weighing more than a certain level on a scale using a load cell, the zero point will shift due to deformation of the load cell, and even if you lower the object, the zero point will remain shifted, so the weight There is a problem that the display becomes incorrect.

OBJECTS OF THE INVENTION It is an object of the present invention to provide an electronic scale that can prevent zero point deviation due to the causes mentioned above.

Summary of the Invention The present invention has a weighing section using a load cell, which is equipped with a clock that counts the time and an alarm that issues an alarm, and when a certain amount of time has elapsed while a load of a certain value or more is being applied to the weighing section. Now that the alarm is working,
The structure is such that no load is applied to the weighing section for a long period of time, thereby preventing the zero point from becoming erroneous.

Embodiment of the invention In FIG. 1, a weighing section (2) with a load cell that converts the weight of the object to be weighed into an electrical signal and outputs it, and a mode changeover switch (3) are connected to the CPU (1). The program memory (4), which is stored in ROM and RAM, the clock (4cL) that keeps track of time, and the RAM
A good PLU memory (5), a display/key device (6) with keys as a setting section, an alarm (6a) that generates a warning sound, and a CPU 2 that controls the printer.
(7) is connected. This CPU2 (7) has a program memory (8) consisting of ROM and RAM.
, character generator (9) consisting of ROM, RA
A print buffer αO of M is connected. I cut it,
The CPU 2 (7) includes a label detector α°C, a pulse motor drive α1 that drives the pulse motor 0z, and a common drive 0 that controls the thermal spatula)' (Ml 'fr).
9 and an image signal drive αG are connected.

Next, the printer section will be explained based on FIG.

First, rectangular labels 0Q are pasted at regular intervals on a long mount ano. This mount αη has 0 rollers, 9 platens for feeding the label, and a peeling plate Q1)
, and is wound up by a winding section (not shown) via rollers (c). The label 0 is placed on the top of the platen.
A thermal head α4 is provided which is connected to the sakaki and performs printing. In addition, since the mount 07) is sharply bent at the peeling plate (C), the label 0 mallet is peeled off and pushed out horizontally. α℃ is provided. Furthermore, a pulley (C) is formed at the end of the platen, and a timing belt (C) is stretched between this pulley (C) and the pulley (C) of the pulse motor α2. .

Next, the structure and operation of the thermal head α will be explained in the third section.
This will be explained based on the diagram and FIG. First, in the thermal head α4, 256 heating elements (C) of R1-R256 are arranged in a direction perpendicular to the moving direction of the label 0■. ,R
32 to R64, . . . are grouped into 32 groups and divided into eight groups, COMI to C0M8. And the common drive αυ is classified into 94 by 4 transistors, and COMI is C0M8 and CO
Connected to MI and heating element @. Similarly, C0M2 is connected to the heating element between C0M7 and C0M2, and C0M3
is connected to the heating element (c) of C0M6 and C0M3, and C
0M4 is connected to the heating element (c) of C0M5 and C0M4.

Further, two data latch/image signal drive circuits (c) and (c) are provided which operate in response to a data latch signal from the CPU 2 (7) and an image signal drive control signal from the image signal drive OG. On one side is C
The heating elements (c) of OMI to C0M4 are connected, and the heating elements (c) of C0M5 to C0M8 are connected to the other.

Therefore, actual printing is performed at the timing shown in FIG. That is, one line printing cycle is divided into four equal parts and the pulse motor 02 is sent intermittently to perform line feeding, and for each line feeding, COMI is
and C0M8, C0M2 and C0M7, C0M3 and C0M6
, energize the heating elements (a) of C0M4 and C0M5.

Next, the operation will be explained based on the flowcharts of FIGS. 5 and 6. First, according to Figure 5, the CPU
The operation of I (1) will be explained. After the power is turned on, each connected device is initialized, and the printing position on the label 0 scoop and the feed amount for controlling the printing format are transferred to the CPU 2 (7) that controls the printer. Thereafter, the main routine is entered by scanning the display on the display/key device (6). In this main routine, the weighing section (
The data of 2) is loaded, and the mode selector switch (3) is pressed.
The status of is read, and modes such as measurement fixed amount issue mode, inspection settlement mode, setting mode, etc. are set. Also, the key information of the display/key device (6) is taken in and processed.

After this, if it is in the weighing mode, the data in the weighing section (2) is multiplied by the unit price to obtain the price, and when the conditions for issuing the label OQ are set, the printer) F is set to 1, and the value is displayed on the display/key device (6). Output and display data such as. And print F
If is 1, check the status of the printing device, print OK 7 sets the print data, and this i CPU
2 Transfer to (7). Thereafter, print F is reset to O and the process returns to the main routine.

Also, if the mode is the inspection settlement mode, the inspection settlement F is determined, and if it is not "0", the status of the printing device is checked, and if printing is OK, the print data is set, and this is sent to the CPU2 (7). Transfer to.

After that, the inspection settlement F is reset to O and the process returns to the main routine. Furthermore, if the mode is the setting mode, each setting task is performed and the process returns to the main routine.

Next, C to control the printer based on Figure 6.
The operation of PU2 (7) will be explained. After turning on the power, initialize each connected device and turn on the CPU
After receiving the feed amount for controlling the print format, print position, etc. on the label 0 from m, the program enters the main routine. In the main routine, it is first determined whether or not paper is being fed, and if it is, the pulse motor drive α1 is driven, the pulse motor O9 is rotated, and the process returns to the main routine. At this time, if paper is not being sent, data is received from CPUI (1).

If the amount of data is 9, the data is processed and the process returns to the main routine. If this is print data, process the data and run a character generator (
9) Complete all processing, generate a print pattern on print buffer 00, print, and return to the main routine.

Next, each subroutine shown in FIGS. 7 to 9 will be explained. First, what is shown in FIG. 7 is a routine for key processing, and what is shown in FIG. 8 is a routine for setting work. The key process is to set the weight limit at which an alarm will occur when in the alarm setting mode, and then set the time period for which the alarm will be triggered if the aforementioned weight is left on the table. When this number is completed, set the alarm setting F and return. In the setting work shown in Figure 8, these data are read, data is transferred, and the alarm setting F.
After resetting, return to the main routine.

Next, what is shown in FIG. 9 is an alarm routine, and C
Check whether the clock (4α) connected to PUI (1) has started or not using the clock start F, and when the clock start F is 0, read the alarm weight A set as described above. and data B. Then, by comparing the two, if the data B of the weighing section (2) is smaller, the process directly returns to the main routine and the data B
If is larger, the clock (4α) is started, the clock start F is set, and the alarm occurrence time a is read.

That is, when the clock start F is set, a comparison is made with the alarm occurrence time a, and if the time a has not been reached, data C from the weighing section is read, and this data C is larger than the alarm occurrence weight A. If so, return to the main routine. Also, the fact that data C has become smaller than alarm generation weight A at this point is because the object to be weighed has been removed from the weighing section (2).
Reset the operation of L), reset the clock start Fi, and return.

In addition, if the state in which the clock start F is set, that is, the state in which a weight equal to or greater than the alarm generation weight A is applied to the weighing section (2) continues, and the weight exceeds the alarm generation time a = i, the alarm ( 6α) is activated and an alarm is generated.

When this alarm occurs, the alarm continues until the object to be weighed is lowered from the weighing section (2) and the zero key is pressed, and when the object to be weighed is lowered and the zero key is pressed, the zero point is reliably returned. Then, the alarm (6α) is stopped, the clock (4a) is stopped, the clock start F is set to 0, and the process returns to the main routine.

Effects of the Invention As described above, the present invention is configured such that when a weight exceeding a certain value is applied to the weighing section acting as a load cell and the weight exceeds a certain value, an alarm is activated. This prevents the application of a load and thereby prevents the zero point from shifting, ensuring that the operator does not notice that the zero point has shifted and continues with the weighing operation. It is something that can be prevented.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; FIG. 1 is a block diagram, FIG. 2 is a side view of the main parts of the printer section, and FIG. 3 is a circuit diagram of the thermal head shown in relation to a label. Fig. 4 is a timing chart, Fig. 5 is a flowchart showing the operation of the CPU I, Fig. 6 is a flowchart showing the operation of the CPU 2, Fig. 7 is a flowchart showing the "key processing" subroutine, and Fig. 8 is a flowchart showing the "setting work". FIG. 9 is a flowchart showing the subroutine of "alarm". 1... CPUI (CPU), 2... Weighing section, 4a
One clock, 6a-Alarm application person Tokyo Electric Co., Ltd. cm Country D

Claims (1)

[Claims] A weighing section with a load cell that converts the weight of the object to be weighed into an electrical signal and outputting it, a clock that counts the time, and an alarm that issues an alarm are connected to a CPU, and the data from the weighing section is constant. The electronic scale is characterized in that the alarm is activated when the value exceeds the value for a certain period of time.