JPH0349054B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field of the Invention The present invention relates to an automatic weighing and value labeling device that measures the weight of a tray containing products and affixes a label with corresponding data printed thereon.

Technical Background and Problems In general, products that require freshness, such as meat and fresh fish, are often packaged using transparent trays so that customers can visually check their freshness. In order to affix a label with a price specified on such an item, a weighing and value attaching device is used which measures the weight of the item in a weighing section and affixes a printed label to the item based on the measured data.

In order to operate such a weighing device, it is necessary to detect the position of the item using a detector, and thereby control the operation of each part. That is, as shown in FIG. 1, a tray 2 as an object to be detected is transported by a conveyor 1, and this tray 2 is detected by an optical detector 3. However, when the tray 2 is transparent as described above, even if the product is packaged, it is partially transparent and a detection signal as shown in FIG. 2 is generated. At this time, even if the leading end of the tray 2 is a and the rear end is b, an undetected area 4 is generated between the two, and as a result, although there is only one tray 2, there are three trays 2. This results in an erroneous signal such that there is a detection signal, and as a result, each section that operates based on the detection signal causes chattering and becomes inoperable. Furthermore, if measures are taken to ensure that only normal signals as shown in Fig. 3 are detected, such as not allowing signals to be detected unless they continue for a certain period of time,
The signal shown in FIG. 2 cannot be accepted as a detection signal and becomes undetectable.

Purpose of the Invention The present invention is designed to enable reliable detection by converting into stable detection signals even when the object to be detected has a transparent part and several detection signals are output for one detection. The purpose of this invention is to obtain an automatic weight value marking device.

Summary of the Invention The present invention generates a detection signal that continues for a predetermined period of time by a timer from that point on when the output of a detector that detects the front end or rear end of an object to be detected is generated, thereby ensuring stable detection. It is configured so that a signal can be obtained.

Embodiment of the Invention A first embodiment of the invention will be described with reference to FIGS. 4 to 6. Components that are the same as those described with reference to FIGS. 1 to 3 are designated by the same reference numerals, and description thereof will be omitted. First, a packaging machine 5 is provided, and a weighing conveyor 8 placed on a scale 7 that measures the weight of the tray 2 via a supply conveyor 6 and a label printed by a label printer 9 are attached to the packaging machine 5. A conveyor 10 and a discharge conveyor 11 are successively installed. That is, the supply conveyor 6, the weighing conveyor 8, the pasting conveyor 10, and the delivery conveyor 11.
A weighing value adding device 12 is constituted by the above. A detector 3 optically detects the tray 2.
is provided on the supply conveyor 6.

Next, the weighing value adding device 12 includes a CPU 13.
is provided, and this CPU 13 has an I/O port 1.
4, a pasting position switch 15, a tray detection unit 16 connected to the detector 3, a timer A 17, a timer B 18, an alarm drive circuit 19, a lamp drive circuit 20, and a conveyor drive circuit 2.
1. Relay drive circuit 22 is connected. The timers 17 and 18 are connected to interrupt terminals of the CPU 13, a buzzer 23 as an alarm is connected to the alarm drive circuit 19, a lamp 24 as an alarm is connected to the lamp drive circuit 20, The various conveyors 25 described above are connected to the conveyor drive circuit 21. That is, each conveyor 6, 8, 10, 11 is independently controlled. Further, a relay 26 is connected to the relay drive circuit 22, and this relay 26 is connected in series with a stop switch 27 for controlling the power source of the packaging machine 5.

Here, the timer 17 sets a predetermined time by detecting the tip of the tray 2.
Reference numeral 8 is for detecting a predetermined time by detecting the rear end of the tray 2.

In such a configuration, when the tray 2 is detected by the detector 3 as shown in FIG. 6, a signal having the non-detection portion 4 as shown in FIG. 6b is generated in the same way as explained in connection with FIG. do. At this time, the timer 17 operates simultaneously with the detection of the tip, and a detection signal that continues for a predetermined time T is generated as shown in FIG. 6c. The time T of this detection signal is set in consideration of the supply speed from the packaging machine 5, etc., so as not to overlap with the signal from the next tray 2, as shown in FIG. Of course, this time is longer than the time it takes for one tray 2 to pass.

Therefore, even if the tray 2 is transparent and a detection signal as shown in Fig. 6b is output, the obtained detection signal is as shown in Fig. 6c, and is used as a stable signal to ensure operation control of each part. go to

Such an operation is effective when the position at which the label is attached to the tray 2 is determined based on the tip.

Next, a second embodiment of the present invention will be described based on FIGS. 8 and 9. In this embodiment, the label pasting position is set with reference to the rear end of the tray 2, and the detection by the tray 2 is as shown in FIG. 8b. At this time, the timer 18 is
works like this. That is, since the timer 18 uses the falling edge of the signal from the detector 3 as its rear end, when the non-detection area 4 of the tray 2 is detected, it is set at that timing. Then, the non-detection section 4
It will be set again when it warms up. In this way, the timing at which the time has elapsed since the last setting is used as a reference and the detection signal is used to control the operation. Therefore, even if there is a signal from the detection section 3 during the set time of the timer 18, it will not be used as a detection signal, and therefore will not malfunction. The flow at this time is shown in FIG.

Next, a third embodiment of the present invention will be shown based on FIG. Currently, in the measurement value attaching operation, there is a possibility that measurement errors, pasting errors, etc. may occur. For example, a measurement error may occur when the scale 7 becomes unstable due to vibrations from the floor or the like. In this embodiment, this stable state is controlled using a timer 17. That is, if the balance 7 is immediately stabilized by a detection mechanism (not shown), it will shift to normal operation and there will be no problem. Furthermore, if the timer 17 becomes stable before it is set up, there is no problem because the operation is shifted to normal operation. However, if the timer 17 is set up before the balance is stabilized, the scale 7 will not be stabilized even though the tray 2 has been sent out, so it is assumed that an error has been detected as a weighing error. This signal causes the operator of the packaging machine 5 to receive an alarm such as the buzzer 23 sounding or the lamp 24 flashing, or the packaging machine 5 is stopped (specifically, the relay 26 is turned OFF), or the weighing value is Any action that causes the attached device 12 to stop is performed.

Moreover, the one shown in FIG. 11 is a modification thereof, in which the packaging machine 5 is stopped and all the conveyors 6, 8, 10, 11 of the weight value marking device 12 are operated at the same time. Therefore, when an abnormality occurs, the tray 2 is not in the apparatus, and its processing becomes easy.

Effects of the Invention The present invention provides a detection signal that continues for a predetermined period of time from the detection of the leading or trailing edge of the detected object when the detected object having a transparent portion is detected by an optical detector as described above. A timer is provided to generate a stable detection signal, and the time set by this timer is used as a margin for determining weighing errors and labeling errors, ensuring reliable operation. It is also easy to issue an alarm or shut down the device.

[Brief explanation of drawings]

Figure 1 is a side view showing an example of tray detection, Figure 2 is a side view showing an example of tray detection.
The figure is a waveform diagram of the detection signal that causes chattering.
FIG. 3 is a waveform diagram of a desirable detection signal, FIG. 4 is a side view showing the first embodiment of the present invention, FIG. 5 is a block diagram, FIGS. 6 a, b, and c are waveform diagrams, and FIG. 7 is a flowchart, FIGS. 8a, b, and c are waveform diagrams showing a second embodiment of the present invention, FIG. 9 is a flowchart, and FIG. 10 is a flowchart showing a third embodiment of the present invention. FIG. 11 is a flowchart showing a modification thereof. 2... Tray (object to be detected), 3... Detector, 5
... Packaging machine, 6 ... Supply conveyor (conveyance path), 1
2...Measuring value adding device, 17-18...Timer,
23... Buzzer (alarm), 24... Lamp (alarm).

Claims (1)

[Scope of Claims] 1. A detector is provided for optically detecting the detected part transferred by a conveyance path connecting the packaging machine to the weighing value marking device, and from the time when the front end or the rear end of the detected part is detected, An automatic weighing value recording device characterized in that it is provided with a timer that continues to generate a stable detection signal for a predetermined time longer than the total length detection time of the object to control each part. 2. The time set by the timer is a stabilization time, and if there is an error detection signal even after the timer has expired, an alarm is activated to notify the packaging machine operator. Automatic weighing value marking device. 3. The automatic weighing value according to claim 1 or 2, characterized in that the time set by the timer is a stabilization time, and if there is an error detection signal even after the timer has expired, the packaging machine is stopped. attached device. 4. The time set by the timer is a stabilization time, and if there is an error detection signal even after the time has elapsed, the packaging machine and the weighing value marking device are stopped. Automatic weighing value recording device as described in Section 1. 5. The time set by the timer is a stabilization time, and if there is an error detection signal even after the time has elapsed, the packaging machine is stopped and the measurement value marking device continues to be driven. The automatic weighing value recording device described.