JP3525253B2 - Weight sorter - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a weight sorting apparatus that detects the mass of an article during transportation and sorts the article based on the detected mass in order to confirm or correct the sensitivity in a state close to an actual operating state. It relates to the technology for making it possible.

[0002]

2. Description of the Related Art In a production line, a weight sorter is used to inspect on a line whether the mass of manufactured articles is within a desired range and to exclude defective articles whose mass is not within the desired range from the line. Is used.

FIG. 7 shows the structure of a conventional weight sorting apparatus 10 used for such a purpose.

The weight sorting apparatus 10 has a conveyor 11 for weighing the articles W to be sorted, which are carried out from the preceding stage line 1.
The load sensor 12 receives the load of the conveyor 11 and the article W carried on the conveyor 11 and the load sensor 12 outputs a signal V corresponding to the load.
The load sensor 12 is housed in a waterproof casing 13.

The output signal V of the load sensor 12 is input to the mass detecting means 14. The mass detection unit 14 obtains the mass Q corresponding to the load obtained by removing the load of the conveyor 11 from the load received by the load sensor 12 based on the output signal V of the load sensor 12.

[0006] The judging means 15 outputs the output of the mass detecting means 14 when the article W is being conveyed on the conveyor 11.
The mass Q is determined, and it is determined whether or not the mass Q falls within a preset mass range. If the mass Q does not fall within the mass range, a failure signal is output to the exclusion device 16 provided on the subsequent line 2. Then, when the article W is carried out to the succeeding line 2, the article W is removed from the line.

In the conventional weight sorting apparatus having the above structure, in order to correctly sort the articles W carried into the conveyor 11, the output of the mass detection means 14 when the articles W are on the conveyor 11 is determined. Although it is necessary to represent the mass of the article W with a small error, this error becomes large due to changes in the sensitivity of the load sensor 12, changes in response characteristics, and increase in backlash.

For this reason, conventionally, a reference object (a sample product measured by an accurate balance, a weight such as a weight) having a known mass is carried into the conveyor 11 at regular intervals, and the mass detection means 14 at that time is loaded. From the mass to be detected, changes in sensitivity, changes in response characteristics, increase in backlash, etc. were investigated, and parameters necessary for detecting the mass of the article were corrected.

[0009]

However, as described above, in the method of loading the reference object having the known mass onto the conveyor 11 to check the operating state of the weight sorting apparatus, the former stage line 1 is used.
Since it is necessary to forcibly stop the carry-in of the article W from, the operating rate of the entire line is reduced.

It is an object of the present invention to solve this problem and to provide a weight sorting apparatus capable of correcting the parameters necessary for mass detection without lowering the line operating rate.

[0011]

In order to achieve the above object, a weight sorting apparatus according to claim 1 of the present invention comprises a housing,
Wherein is arranged outside the vicinity of the housing, a conveyor for conveying articles, said housing provided in the body, the load sensor receive the load of the carried-in article to said conveyor and said conveyor,
An article sensor that detects the loading of articles onto the conveyor, and a mass detection unit that obtains a mass corresponding to a load obtained by subtracting the load of the conveyor from the load applied to the load sensor based on the output signal of the load sensor. And the article detected by the article sensor is the mass of the article output from the mass detection means at a predetermined timing on the conveyor, and whether the mass falls within a preset mass range. Judgment means for making a judgment and outputting a judgment signal corresponding to the judgment result, a weight having a known mass provided in the housing, and a weight provided in the housing for adding or removing the load of the weight to the load sensor. When the loading of the next article is not detected within a predetermined time after the loading of the article to the conveyor is detected by the article sensor and the loading / unloading mechanism for Load of the weight to the load sensor
The addition / removal mechanism is controlled so that the weight is repeatedly applied at a predetermined cycle.
And insertion and deletion mechanism control means for control, the weight on the load sensor
Maximum and maximum output of the mass detection means when loaded
Fluctuation amount showing difference from small value or the fluctuation amount is within the allowable range
The time required to enter the
The response characteristic detection means to obtain the response characteristic value of the sensor,
The flatness of the response characteristic value detected by the response characteristic detecting means.
Check whether the average value is within the preset reference characteristic range.
The response characteristic determining means and the response characteristic determining means
Therefore, the average value of the response characteristic values of the load sensor is the reference value.
When it is judged that it is not within the characteristic range, an abnormal response is reported.
And an abnormality notification means .

Further, a weight sorting apparatus according to a second aspect of the present invention is arranged in the housing and in the vicinity of the outside of the housing, and carries the articles.
A conveyor for sending and a conveyor provided in the housing.
A and the load that receives the load of the goods carried into the conveyor
Heavy sensor and detects the loading of articles on the conveyor
Based on the output signal of the load sensor and the load sensor
From the load applied to the load sensor
Mass detector to find the mass corresponding to the load excluding the load
And the article detected by the article sensor is the conveyor
Output from the mass detection means at the predetermined timing shown above.
The mass of the article is the mass of the article, and the mass is preset.
Determine whether or not it falls within the specified mass range and respond to the determination result
And a determination means for outputting a determination signal to
And a weight of known mass provided in the housing,
Remover for adding and removing the load of the weight with respect to the weight sensor
And the object to the conveyor by the article sensor
After the arrival of the product is detected, the next
When the loading of other goods is not detected, the load sensor
The load of the weight is repeatedly applied at a predetermined cycle.
The addition / removal mechanism control means for controlling the addition / removal mechanism and the load sensor
Of the mass detection means before the load of the weight is applied to the sensor.
Of the mass detection means after the force and the load on the weight are removed.
Backlash to obtain the difference from the force as the backlash value
Screen detection means and the backlash detection means.
The average backlash value issued is preset
Backlash to determine whether or not it is within the allowable range
The determining means and the backlash determining means
It was determined that the average backlash value was not within the allowable range.
Abnormality information that informs of backlash abnormality when set
It is equipped with intellectual means .

According to a third aspect of the present invention, there is provided the weight sorting apparatus according to the first or second aspect, wherein the adding / removing mechanism control means causes the load sensor to have the weight.
By the article sensor while the load of
When the carry-in of the article to the conveyor is detected, the
The addition and removal to remove the load of the weight on the load sensor
It is characterized by controlling the mechanism .

According to a fourth aspect of the present invention, there is provided the weight sorting apparatus according to the first or second aspect, wherein the adding / removing mechanism control means causes the load sensor to use the weight.
By the article sensor while the load of
When the delivery of an article to the conveyor is detected, the article is
For the load sensor up to the detection timing of the mass of the product
The addition / removal mechanism is controlled so that the load of the weight is continuously applied.
The feature is to control .

According to a fifth aspect of the present invention, there is provided the weight sorting apparatus according to the first or second aspect, wherein the adding / removing mechanism control means causes the load sensor to have the weight.
By the article sensor while the load of
When the delivery of an article to the conveyor is detected, the article is
For the load sensor up to the detection timing of the mass of the product
The addition / removal mechanism is controlled so that the load of the weight is continuously applied.
In addition, the mass detection means is a known mass of the weight.
Control to detect the mass of the article by anticipating the load of
It is characterized by that .

According to a sixth aspect of the present invention, there is provided the weight sorting apparatus according to the first or second aspect, wherein the adding / removing mechanism control means applies the load of the weight to the load sensor. when the loading of the article with respect to the conveyor by the article sensor is detected while there, the agent
For the load sensor up to the detection timing of the mass of the product
The addition / removal mechanism is controlled so that the load of the weight is continuously applied.
In addition, the determination means determines that the weight has a known mass.
In anticipation of heavy it is characterized and this <br/> be controlled to make a determination of the mass of the article.

[0017]

[0018]

[0019]

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows the configuration of a weight sorting device 20 to which the present invention is applied.

As shown in FIG. 1, the weight sorting apparatus 20 includes a conveyor 21 for carrying the articles W carried in from the pre-stage line 1, and the conveyor 21 and the conveyor 2.
The load sensor 22 has a load sensor 22 that outputs a signal corresponding to the load of the article W to be loaded in 1, and a waterproof housing 23 that houses the load sensor 22. In addition, here conveyor 2
It is assumed that the load of 1 also includes the load of the supporting member (not shown).

Inside the housing 23, a weight 24 having a known mass Wr and an addition / removal mechanism 25 for adding / removing the load of the weight 24 to / from the load sensor 22 are provided.

The known mass Wr of the weight 24 is selected to be close to the mass of the articles W to be sorted by the weight sorting device 20, and the adding / removing mechanism 25 applies the weight 24 to the load sensor 22.
There is a drive source such as a motor for moving with respect to, and the load of the weight 24 can be added to or removed from the load sensor 22 by controlling this drive source.

An article sensor 26 for detecting articles carried into the conveyor 21 is provided at the carry-in end of the conveyor 21.

The output V of the load sensor 22 is the mass detection means 2
Input to 7. The mass detecting means 27 outputs the output V of the load sensor 22 to an amplifier 28 as shown in FIG.
The amplified output U is sampled by the A / D converter 29 at a predetermined cycle to be converted into a digital value P. The digital value P is input to the calculation means 30 and the load sensor 22 is calculated by the calculation process. The mass Q corresponding to the load obtained by subtracting the load of the conveyor 21 from the load applied to is calculated.

The determination means 31 outputs the output of the mass detection means 27 when the predetermined time T1 required for the load sensor 22 to stabilize after the article sensor 26 detects that the article W has been carried into the conveyor 21 to the output of the article W. With the mass Qw, it is determined whether or not this mass Qw falls within a preset mass range, and a determination signal corresponding to the determination result is output to the second-stage line 2
Output to the excluding device 32 arranged at.

When the rejection device 32 receives a determination signal indicating a defective product from the determination means 31, the removal device 32 removes the product from the line.

The addition / removal mechanism control means 34 is used for the article sensor 26.
When loading of the next article is not detected within a predetermined time T2 (> T1) after the loading of the article W on the conveyor 21 is detected, the addition / removal mechanism 25 is controlled to cause the load sensor 22 to Load the weight 24 for a predetermined time (T5)
After that, the load is released.

The adding / removing mechanism control means 34 keeps the next article W while the load of the weight 24 is being applied to the load sensor 22.
When is loaded on the conveyor 21, the adding / removing mechanism 25 is controlled to immediately remove the load of the weight 24 on the load sensor 22.

The parameter correcting means 35 is the load sensor 2
The parameter for mass detection of the mass detection unit 27 is corrected based on the mass output from the mass detection unit 27 while the load of the weight 24 with respect to 2 is being added or subtracted.

The response characteristic detecting means 36 is the load sensor 22.
The response characteristic of the load sensor 22 to the load of the weight 24 is detected based on the mass output from the mass detection means 27 while the load of the weight 24 is added to or subtracted from the load.

Here, the load sensor 22 is provided with a weight 24.
A case will be described in which the amount of change in the output of the mass detection unit 27 when the predetermined time T3 has elapsed since the load was applied is obtained as the response characteristic value K.
The time from when the load is applied until the variation amount of the output of the mass detection unit 27 falls within the allowable range may be obtained as the response characteristic value. The response characteristic determining means 37 determines whether or not the response characteristic value detected by the response characteristic detecting means 36 is within a preset allowable range.

The backlash detecting means 38 outputs the mass detecting means 27 before the load of the weight 24 is applied to the load sensor 22 and the output of the mass detecting means 24 after the load of the weight 24 is removed from the load sensor 22. Backlash value B
Ask as.

The backlash determining means 39 determines whether the backlash value B is within a preset allowable range.

The abnormality notifying means 40 is the response characteristic judging means 3
When it is determined that the response characteristic value K is not within the allowable range by 7, the response abnormality is notified, and the backlash determination means 3
When it is determined by 9 that the backlash value B is not within the allowable range, the backlash abnormality is notified.

This abnormality notification is performed by generation of sound (buzzer sound, voice), lighting of a lamp, blinking, character display by a character display, or the like. Further, in addition to such notification by sound or light, conveyance of the conveyor 21 may be stopped to notify occurrence of abnormality and prevent passage of articles that have not been properly sorted.

Next, the operation of the weight selecting device 20 having the above-mentioned structure will be described with reference to the flow charts of FIGS. 3 to 5 and the timing chart of FIG.

As shown in FIG. 2, when the articles W to be sorted are carried into the conveyor 21, the article sensor 26 outputs a detection signal as shown in FIG. 6A, for example. In synchronization, the common timer of the determination means 31 and the addition / removal mechanism control means 34 starts time measurement (S1,
S2).

Carrying in the article W to the conveyor 21,
The output Q of the mass detection means 27 changes into a substantially trapezoidal shape as shown in FIG.

On the other hand, as shown in FIG. 6C, a predetermined time T1 after the article W starts to be carried into the conveyor 21 (the required time for the article W to be carried into the conveyor 21 and the load sensor 22).
Mass detection means 27 when the sum of
Is determined as the mass Qw of the article W by the judging means 31, and it is judged whether or not this mass Qw is within a predetermined mass range. If it is within the mass range, a non-defective product judgment signal G is output, and the mass range is calculated. If it is not within the range, the defect determination signal NG is output (S5 to S7).

Then, when the next article is detected to be conveyed during the time T2 after the article W is started to be conveyed to the conveyor 21, the process returns to the step S2, and the newly conveyed article W is processed. The quality determination process is performed in the same manner as described above (S8, S9). This time T2 is the same as the previous line 1
It is set to be slightly longer than the normal carry-in cycle of the article W carried in from.

Further, the article W is subjected to the inspection by the front stage line 1 or the like.
Are thinned out, and as shown in FIG.
When the carry-in cycle of the article W with respect to is wider than usual and the carry-in of the next article W is not detected by the time T2 after the carry-in of the previous article W on the conveyor 21 is started, the addition / removal mechanism control means 34 As shown in (d) of FIG. 6, the mass detecting means 27 is set to zero so that the mass Q output from the mass detecting means 27 becomes zero in this unloaded state (excluding the load on the conveyor 21), and the timer is set. 6 starts and the addition / removal mechanism 25 is controlled to apply the load of the weight 24 to the load sensor 22 for a predetermined time (T5) as shown in (e) of FIG. 6 (S10 to S12 of FIG. 4). It should be noted that this zero setting makes the initial mass for detecting backlash zero.

Then, as shown in (f) of FIG. 6, after the time T3 (<T5) has elapsed since the weight 24 was loaded, the response characteristic detecting means 36 continuously outputs, for example, the mass detecting means 27. Multiple N masses Qa (1), Qa
(2), ..., The difference between the maximum value and the minimum value of Qa (N) is detected as the response characteristic value K, and the response characteristic determining means 37 determines whether or not the response detected value K falls within the allowable range. When the response characteristic value K is not within the allowable range, the abnormality notification means 40 notifies the response abnormality (S13 to S1).
6).

If the response characteristic value K is within the permissible range, as shown in FIG. 6G, a predetermined time T4 has passed since the weight 24 was loaded by the parameter correcting means 35.
Mass detection means 2 when (T5>T4> T3) has passed
The output of 7 is obtained as the mass Qr of the weight 24, and the parameters of the mass detection means 27 (the amplification degree of the amplifier 28 and the coefficient used by the calculation means 30 for the calculation are set so that this mass Qr becomes equal to the known mass Wr of the weight 24). Are corrected (S17)
~ S20).

In this way, the correction of the parameters necessary for the mass detection of the mass detection means 27 is completed, and when the time T5 elapses after the weight 24 is loaded, the load of the weight 24 is released and the load sensor 22 becomes It becomes the no-load state again (S2
2).

Then, as shown in FIG. 6 (h), the mass detection means when the backlash detection means 38 stabilizes the load sensor 22 after the time T6 (> T5) has elapsed since the weight 24 was loaded. 27 output is backlash value B
Then, the backlash determination means 39 determines whether or not the backlash value B is within the allowable range, and when it is determined that the backlash value B is not within the allowable range, the abnormality notification means 40 notifies the backlash abnormality. (S23 to S26).

It should be noted that, in the processing S13, S17, and S21, the conveyor 2 is operated before the times T3, T4, and T5 elapse.
When it is detected that the next article has been carried in with respect to 1, the load of the weight 24 on the load sensor 22 is immediately released by the addition / removal mechanism control means 34, the process returns to step S2, and returns to the sorting process for the article (S27 to S30). .

If it is detected in step S23 that the next article is carried in before the predetermined time T6 elapses, the process immediately returns to step S2 and returns to the sorting process for the article (S3).
1).

As described above, the weight sorting apparatus 20 of the embodiment
The load of the weight 24 of the known mass Wr in the housing 23 can be automatically added to and removed from the load sensor 22 when there is an interval for loading the article W onto the conveyor 21. Instead, it is possible to check the state of each part of the weight sorting device 20 and correct the parameters.

In the above description, when the loading of the article W onto the conveyor 21 is detected while the weight 24 is loaded on the load sensor 22, the adding / removing mechanism control means 34 causes the weight 2 to move.
Although the load of No. 4 was immediately released to shift to the sorting process for the loaded articles W, when the loading of the articles W on the conveyor 21 was detected while the weight 24 was loaded on the load sensor 22, , The adding and removing mechanism 25 so that the load of the weight 24 is continuously applied until the detection timing of the mass of the article W.
It is also possible to cause the determination means 31 to output a defect determination signal by controlling the above, and to reject this article W in the subsequent line 2.

While the load sensor 22 is being loaded with the weight 24, the article sensor 26 causes the conveyor 21 to move.
When the loading of the article W onto the article W is detected, the addition / removal mechanism 25 is controlled so that the load of the weight 24 is continuously applied until the timing of detecting the mass of the article W, and the mass detection means 27 causes the weight 24 to detect the known mass Wr. Expected the load of goods W
May be controlled to detect the mass of the.

Further, while the load of the weight 24 is being applied to the load sensor 22, the article sensor 26 causes the conveyor 21 to move.
When it is detected that the article W has been carried into the object, the addition / removal mechanism 25 is controlled so that the load of the weight 24 is continuously applied until the detection timing of the mass of the article W, and the determination unit 31 is provided.
May be controlled so as to determine the mass of the article in consideration of the load of the known mass Wr of the weight 24.

Further, in the above embodiment, the load sensor 22
On the other hand, the weight 24 is loaded only once, but the weight 24 may be repeatedly loaded on the load sensor 22 at a predetermined cycle until the article is loaded.

When the weight 24 is repeatedly added and removed as described above, a plurality of response characteristic values K, weight mass Qr, and backlash value B can be obtained respectively, and an average value thereof is calculated to determine the average value. By doing the same as above,
It is possible to eliminate the influence of external noise.

Further, by making the cycle of loading the weight 24 substantially equal to the normal carrying-in cycle of the article W, it is possible to reproduce the state in which the article is actually carried in continuously, and the movement of the load sensor 22. It is possible to grasp the specific characteristics more accurately.

Further, in the above embodiment, the load sensor 22.
One weight 24 was loaded against the
A plurality of weights 24 may be provided inside, and a weight having a mass similar to that of the article W to be sorted may be selectively or combined and loaded from among the plurality of weights.

[0057]

As described above, according to the first aspect of the present invention.
The weight sorting device described is a housing, a conveyor that is arranged near the outside of the housing and that conveys articles, a load that is provided in the housing , and receives a load of the conveyor and the articles carried into the conveyor. A sensor, an article sensor that detects the loading of articles onto the conveyor, and an output signal of the load sensor, based on the output signal of the load sensor, to determine the mass corresponding to the load obtained by subtracting the load of the conveyor from the load applied to the load sensor. Whether the mass detected by the mass detection means and the mass detected by the mass sensor output from the mass detection means at a predetermined timing on the conveyor is the mass of the mass, and the mass falls within a preset mass range. Determination means for determining whether or not and outputting a determination signal corresponding to the determination result,
A weight having a known mass provided in the housing, an addition / removal mechanism provided in the housing for adding and removing the load of the weight with respect to the load sensor, and carrying in of an article to the conveyor by the article sensor. when loading of the next article is not detected until a predetermined time has elapsed since the detection, prior to
The load of the weight is repeatedly applied to the load sensor at a predetermined cycle.
An addition / removal mechanism control means for controlling the addition / removal mechanism so that the weight is loaded on the load sensor.
Fluctuation indicating the difference between the maximum value and the minimum value of the output of the mass detection means
The time it takes for the quantity or its variation to fall within the allowable range,
As the response characteristic value of the load sensor with respect to the load of the weight,
And the response characteristic detecting means
Therefore, the average value of the response characteristic values detected is set in advance.
Response characteristic judgment to determine whether or not it is within the reference characteristic range
Means and the load sensor by the response characteristic determination means
It was determined that the average value of the response characteristic values of
And an abnormality notifying means for notifying a response abnormality when it is determined .

Therefore, the load of the known mass to the load sensor can be automatically added and removed when the loading interval of the articles is opened, and the load sensor of the weight sorter can be maintained without lowering the operation rate of the line. The response characteristics of the external noise
Can be accurately investigated without being affected by
You can know the occurrence of abnormalities .

[0059]

[0060]

[0061]

[0062]

[0063]

[0064]

Further, a weight sorting apparatus according to a second aspect of the present invention is arranged in a housing and in the vicinity of the outside of the housing to carry articles.
A conveyor for sending and a conveyor provided in the housing.
A and the load that receives the load of the goods carried into the conveyor
Heavy sensor and detects the loading of articles on the conveyor
Based on the output signal of the load sensor and the load sensor
From the load applied to the load sensor
Mass detector to find the mass corresponding to the load excluding the load
And the article detected by the article sensor is the conveyor
Output from the mass detection means at the predetermined timing shown above.
The mass of the article is the mass of the article, and the mass is preset.
Determine whether or not it falls within the specified mass range and respond to the determination result
And a determination means for outputting a determination signal to
And a weight of known mass provided in the housing,
Remover for adding and removing the load of the weight with respect to the weight sensor
And the object to the conveyor by the article sensor
After the arrival of the product is detected, the next
When the loading of other goods is not detected, the load sensor
The load of the weight is repeatedly applied at a predetermined cycle.
And insertion and deletion mechanism control means for controlling the serial insertion and deletion mechanism, out of the mass detection means before the load is applied to the weight to the load sensor
Out of the mass detection means after the force and the load of the weight is removed
Backlash detection means for obtaining the difference between the force and the backlash value and the backlash detection means
Backlash determining means for determining whether the average value of the issued backlash values is within a preset allowable range, and the average value of the backlash values by the backlash determining means is the allowable range. When it is determined that the backlash abnormality is not present, the abnormality notification means is provided.

For this reason, the backlash of the load sensor is prevented from being affected by external noise and the like without lowering the operation rate of the line .
Accurate investigation without any influence and increase
You can know the abnormalities.

According to a third aspect of the present invention, there is provided the weight sorting apparatus according to the first or second aspect, wherein the addition / removal mechanism control means applies the load of the weight to the load sensor. The loading / unloading mechanism is controlled so as to remove the load of the weight on the load sensor when the loading of the product on the conveyor is detected by the article sensor during the operation.

Therefore, it is possible to correctly sort the articles carried in when the weight is loaded.

According to a fourth aspect of the present invention, there is provided the weight sorting apparatus according to the first or second aspect, wherein the adding / removing mechanism control means applies the load of the weight to the load sensor. While loading the article to the conveyor is detected by the article sensor while the article sensor is being controlled, controlling the addition / removal mechanism so that the load of the weight on the load sensor is continuously applied until the detection timing of the mass of the article. It has a feature.

Therefore, articles carried in while the weight is loaded can be excluded from the line as defective articles.

According to a fifth aspect of the present invention, there is provided the weight sorting apparatus according to the first or second aspect, wherein the adding / removing mechanism control means applies the load of the weight to the load sensor. When carrying in of the article to the conveyor is detected by the article sensor while being, while controlling the adding and removing mechanism so that the load of the weight to the load sensor is continuously applied until the detection timing of the mass of the article, It is characterized in that the mass detecting means controls so as to detect the mass of the article by anticipating the load of the known mass of the weight.

Therefore, it is possible to correctly sort the articles carried in when the weight is loaded.

According to a sixth aspect of the present invention, there is provided the weight selecting apparatus according to the first or second aspect, wherein the adding / removing mechanism control means applies the load of the weight to the load sensor. When carrying in of the article to the conveyor is detected by the article sensor while being, while controlling the adding and removing mechanism so that the load of the weight to the load sensor is continuously applied until the detection timing of the mass of the article, It is characterized in that the judging means controls so as to judge the mass of the article in consideration of a known mass load of the weight.

Therefore, it is possible to correctly sort the articles carried in when the weight is loaded.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of an embodiment of the present invention.

FIG. 2 is a diagram showing a configuration of a main part of the embodiment.

FIG. 3 is a flowchart for explaining the operation of the embodiment.

FIG. 4 is a flowchart for explaining the operation of the embodiment.

FIG. 5 is a flowchart for explaining the operation of the embodiment.

FIG. 6 is a timing chart for explaining the operation of the embodiment.

FIG. 7 is a diagram showing a configuration of a conventional device.

[Explanation of symbols]

1 Front line 2 Second line 20 Weight sorter 21 conveyor 22 Load sensor 23 housing 24 weights 25 Addition / removal mechanism 26 Article sensor 27 Mass detection means 28 amplifier 29 A / D converter 30 computing means 31 Judgment means 32 Exclusion device 34 Addition / removal mechanism control means 35 Parameter correction means 36 Response characteristic detecting means 37 Response characteristic judging means 38 Backlash detection means 39 Backlash determination means 40 Abnormality notification means

Front Page Continuation (72) Inventor Naofumi Suzuki 5-1027 Minamiazabu, Minato-ku, Tokyo Within Anritsu Co., Ltd. (56) References JP-A-54-17767 (JP, A) JP-A-57-76418 ( JP, A) JP 54-17767 (JP, A) JP 3-17085 (JP, B2) JP 4-51770 (JP, B2) JP 57-28888 (JP, B1) JP Hei 1-8974 (JP, Y2) Hei 3-32985 (JP, Y2) Hei 56-6190 (JP, Y1) Patent 2706837 (JP, B2) Patent 3413575 (JP, B2) (58) Field (Int.Cl. ⁷ , DB name) G01G 11 / G01G 23 /

Claims (6)

(57) [Claims] And 1. A casing, wherein is arranged outside the vicinity of the housing, a conveyor for conveying articles, said housing provided in the body, the load sensor receive the load of the carried-in article to said conveyor and said conveyor An article sensor for detecting loading of an article on the conveyor, and a mass detection for obtaining a mass corresponding to a load obtained by subtracting a load of the conveyor from a load applied to the load sensor based on an output signal of the load sensor. Means, and the article detected by the article sensor is the mass of the article output from the mass detection means at a predetermined timing on the conveyor, whether the mass falls within a preset mass range Determining means for outputting a determination signal corresponding to the determination result, a weight having a known mass provided in the housing, and a load sensor provided in the housing. Wherein the insertion and deletion mechanism for insertion and deletion load of the weight, when the loading of the next article to carry the article to a predetermined time elapses after being detected for said conveyor by said article sensor is not detected for the load Front to sensor
The addition and removal are performed so that the load of the weight is repeatedly applied in a predetermined cycle.
An addition / removal mechanism control means for controlling the mechanism, and the mass detection when the weight is loaded on the load sensor.
The amount of fluctuation that indicates the difference between the maximum value and the minimum value of the output of the output means
Is the time it takes for the fluctuation amount to fall within the allowable range.
Obtained as the response characteristic value of the load sensor for the load of
And a response characteristic value detected by the response characteristic detecting means.
Whether the average value is within the preset standard characteristic range
And a response characteristic determination means for determining the response characteristic of the load sensor by the response characteristic determination means.
It was determined that the average sex value was not within the reference characteristic range.
At this time, a weight sorting device provided with an abnormality notifying means for notifying a response abnormality . 2. A casing and a container arranged near the outside of the casing for conveying articles.
A, the conveyor provided in the housing , and the conveyor
Sensor for receiving the load of the article carried into the conveyor , and an article sensor for detecting the article carried into the conveyor
And, based on the output signal of the load sensor,
Load excluding the conveyor load from the applied load
The mass detection means for determining the mass corresponding to, and the article detected by the article sensor on the conveyor.
Quality output from the mass detection means at a predetermined timing
The mass is the mass of the article, and the mass is preset
It is judged whether it falls within the range and the judgment corresponding to the judgment result.
A determining unit that outputs a constant signal, a weight having a known mass provided in the housing , a weight provided in the housing , and the weight for the load sensor.
The loading and unloading mechanism for loading and unloading the load of the article , and the article sensor conveys the article to the conveyor.
The next item within a specified time after the entry is detected
When the loading of the
The addition and removal are performed so that the load of the weight is repeatedly applied in a predetermined cycle.
An addition / removal mechanism control means for controlling the mechanism, and the mass detection before the load of the weight is applied to the load sensor.
The mass detection after the output of the output means and the load of the weight are removed
The backlash value is the difference between the output and the output of the output means.
And a backlash detected by the backlash detection means.
The average rush value is within the preset tolerance range
Backlash determining means for determining whether or not the backlash is detected by the backlash determining means.
When it is determined that the average value of the measured values is not within the allowable range
Also equipped with an abnormality notification means for notifying a backlash abnormality
For example was the weight sorting apparatus. 3. The load / unload mechanism control means is the load sensor.
To the article sensor while the weight load is being applied to
Therefore, when the carry-in of the article to the conveyor is detected
To remove the load of the weight on the load sensor.
The weight sorting device according to claim 1 or 2, wherein the addition / removal mechanism is controlled . 4. The load / unload mechanism control means is the load sensor.
To the article sensor while the weight load is being applied to
Therefore, when the carry-in of the article to the conveyor is detected
The load sensor until the detection timing of the mass of the article.
The addition and removal so that the load of the weight against
The weight sorting apparatus according to claim 1 or 2, wherein the mechanism is controlled . 5. The load / unload mechanism control means is the load sensor.
To the article sensor while the weight load is being applied to
Therefore, when the carry-in of the article to the conveyor is detected
The load sensor until the detection timing of the mass of the article.
The addition and removal so that the load of the weight against
The mass detection means controls the mechanism and
To detect the mass of an article by anticipating a load of known mass
Weight sorting apparatus according to claim 1 or claim 2, wherein the control. 6. The timing for detecting the mass of the article when the article sensor detects that the article has been carried into the conveyor while the load sensor is applying the weight load to the load sensor. Up to the load sensor
The addition and removal so that the load of the weight against
While controlling the mechanism, the judging means knows the weight.
It is controlled so that the weight of the article can be determined by anticipating the weight load.
Weight sorting apparatus according to claim 1 or claim 2, wherein the the control.