JPH04346878A - Weight classifier - Google Patents

Abstract

PURPOSE:To provide a weight classifier with no need to reset a weight setter in a demonstration run. CONSTITUTION:A weight setter 22 capable of setting an optional weight rank for each discharge station, a memory 23 with the weight rank fixed, a switch 24 for outputting the set value of the weight setter until the indication of a confirmation action is detected and outputting the fixed value of the memory when the indication is detected and a comparator 21 for comparing the weight of the article to be classified detected during the conveyance with the set value outputted from the switch 24 are provided. Consequently, the weight rank in the demonstration run is written in the memory 23 for each discharge station, the weight rank in the normal run is set in the setter 22 for each discharge station, and the weight rank inputted to the comparator 21 is switched by the switch 24 separately for the demonstration and normal runs.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a weighing device for weighing and automatically weighting products to be sorted.

0002

[Prior Art] Japanese Patent Laid-Open No. 59-76583 discloses a plurality of baskets 2 in an endless body 1 as shown in FIG.
Attach the weighing station 3 located outside the system of the endless body 1 to place the weighed products to be sorted into the basket 2.
When placed in the basket 2 and passing through the discharge stations 41 to 4N, the weighed value of each item to be sorted is compared with the weight rank of that discharge station, and the discharge of the corresponding weight rank is performed. When the basket 2 arrives at the station, the basket 2 is tilted and the products to be sorted are discharged at the position of the corresponding discharge station, such as the position of the discharge station 42 in FIG. 5, for each weight rank. ing.

0003

[Problems to be Solved by the Invention] In such a conventional weight sorting device, each discharge station 41, 42...
The discharge triggers 81, 82, . . . are controlled as shown in FIG. 6 to tilt the basket 2.

In FIG. 6, discharge stations 41, 42
A comparator 21 and a weight setter 22 are provided for each discharge station, and the weight rank of the discharge station is set in the weight setter 22. The comparator 21 compares the weight rank given from the weight setter 22 with the weighed value G of the item to be sorted placed in the basket 2 that has arrived at the position of the discharge station, and determines which item belongs to its own weight rank. If the weighed value G of the item to be sorted belongs to the own weight rank, the control unit 20 operates the discharge trigger 8 of the own discharge station to tilt the basket 2. If the weighed value G of the item to be sorted does not belong to the own weight rank, the discharge trigger 8 of the own discharge station is not operated and the item to be sorted is placed in the basket 2 and is sent to the next discharge station. Continuing transport.

[0005] In this way, with the conventional apparatus, when attempting to carry out a demonstration operation in which items of known weight to be sorted are placed one after another in the basket 2 and a specified number of items are collected at each discharge station, each Weight setting device 2
2 is reset to the weight for demonstration driving. When the demonstration operation is finished and the operation is returned to normal operation in which items to be sorted of unknown weight are handled, it is necessary to reset the weight rank of each weight setter 22 to the desired weight rank.

[0006] When carrying out a demonstration operation of a weight sorting device that is already operating at a target weight rank,
When the demonstration operation is finished, each weight setting device 2
It is necessary to reset the weight rank 2 to the original weight rank. In this case, especially when returning to the original weight rank, there is a risk that the setting may be incorrect and the sorting accuracy may deteriorate significantly.

[0007] The present invention eliminates the need to operate the weight setter 22 for setting the target weight rank during demonstration operation, or when returning to normal sorting operation after the demonstration operation. The purpose of the present invention is to provide a weight sorting device.

[0008]

[Means for Solving the Problems] The weight sorting device of the present invention arranges discharge stations each having a weight rank along a conveyance path of an endless body, and arranges discharge stations having a set weight rank at predetermined intervals between the rotatably driven endless bodies. The items to be sorted are loaded onto the basket and transported, and the weight of the items to be sorted is measured during transportation.
In a weight sorting device that, when a basket arrives at the discharge station position of the weight rank to which the weight of the product to be sorted belongs, tilts the basket and discharges the product to be sorted to the corresponding discharge station. A weight setting device in which the weight rank is set, a memory in which the weight rank is a fixed value, and a setting value of the weight setting device is output until a confirmation operation instruction is detected, and a fixed value in the memory is output when a confirmation operation instruction is detected. and a comparison section that compares the weight of the items to be sorted measured during transportation with the set value output by the switch section, and the tilting of each basket is determined based on the judgment output of each comparison section. It is characterized by being configured to control the operation.

[0009]

[Operation] According to this configuration, the weight rank during the demonstration operation is written in the memory for each discharge station. The weight rank for normal operation is set on the weight setting device for each discharge station. The switch section specifies a weight rank to the comparator depending on whether it is "demonstration operation/normal operation" and the tilting operation of each basket is controlled.

0010

Embodiments Hereinafter, embodiments of the present invention will be explained based on FIGS. 1 to 3. 2 and 3 show the overall configuration of the weight sorting device of the present invention, and the weight setting device 22 for each discharge station in FIG. 3 actually sets the weight for each discharge station as shown in FIG. device 22 and memory 23
and a switch section 24.

First, the overall configuration is shown in FIGS. 2(a) and 3(b).
The explanation will be based on. The endless body 1 is arranged to rotate horizontally with respect to the installation location A, and the outward path 5 and the backward path 6 are in the same plane. A plurality of baskets 2 on which items to be sorted are placed are attached to the endless body 1 at predetermined intervals. Here, assuming that the direction of conveyance of the endless body 1 is the direction of arrow C, the discharge stations 41 to 4 are located in the direction of conveyance C.
A weighing conveyor 7 is installed on the upper side of 4. The weighing conveyor 7 is driven to rotate in the same direction as the endless body 1, and measures the load of the basket passing therethrough.

The discharge triggers 81 to 84 provided at the discharge stations 41 to 44 are operated as follows based on the weight value of the weighing conveyor 7 and the weight rank set for each discharge station 41 to 44. ing.

As shown in FIG. 3, the load cell 10 of the weighing conveyor 7 is digitally converted by an A/D converter 11 and input to the first control section 9, and the tare weight of each basket 2 is also written therein. A tare memory 12 and the like are connected thereto. Here, a first position detector 13 detects the passage of each basket 2, and a second position detector 14 detects that a specific one of the baskets 2 passes the position immediately before the weighing conveyor 7. is provided,
When the second position detector 14 detects the first basket 21 as the specific basket, the counting contents of the counter 15 are reset, and the first control section 9 resets the contents of the counter 15. Detecting this, the tare amount of this specific basket 21 is read from the tare memory 12, and the weight value given from the load cell 10 is corrected via the A/D converter 11 to obtain the weight which is the net weight value. Data D is output. The count contents of the counter 15 are incremented each time the basket 2 passes,
The tare amount read out from the tare memory 12 is sequentially switched, and the first control section 9 outputs the net weight value of the items to be sorted placed in the basket 2 passing through the weighing conveyor 7 as weight data D. There is. A rotary encoder 17 is directly or indirectly attached to a first drive motor 16 that rotationally drives the endless body 1, and a second drive motor 18 that drives the belt of the weighing conveyor 7.
The output of the rotary encoder 17 is connected to the driver 19, which is operated so that the running speed of the belt of the weighing conveyor 7 is the same as the running speed of the endless body 1, and the load of the basket 2 passing therethrough is is being weighed at high speed.

Comparators 211 to 214 and discharge triggers 81 to 84 for each discharge station 41 to 44 are connected to the second control unit 20, and the comparators 2
11 to 214 are the weight data D output from the first control unit 9 and the respective weight setting devices 221 to 224.
The second control unit 20 determines and stores the drive timing of the discharge triggers 81 to 84 based on the comparison result, and controls the rotary encoder 17.
The corresponding discharge trigger 81 is activated at an appropriate time based on the signal of
~84 is driven.

A specific example will be explained based on FIG. 4. 4(a) shows the output signal of the first position detector 13, and FIG. 4(b) shows the output signal of the first position detector 13.
) is the output signal of the second position detector 14, and FIG. 4(c) is the weight rank D1, D2 of the weight setting devices 221 to 223.
, D3 and occasional weight data D. In addition, Fig. 4 (d
) to (f), the second control unit 20 is connected to the comparators 211 to 21
3, which is the determination result read from the second control unit 2.
0 is the first to third discharge triggers 81 to 8 as follows.
3 at the appropriate timing.

The time t1, t2, t3, t4 required for the basket 2 to arrive at the discharge stations 41, 42, 43, 44 after passing through the weighing conveyor 7 is determined depending on the traveling speed of the endless body 1. Second control unit 20
Since information regarding the speed of the weighing conveyor 7 is input from the rotary encoder 17, the comparator 211
Ejection station 41 determined by the output of ~213
When the reaching time up to 43 has elapsed, the discharge triggers 81 to 83 are driven.

In the example shown in FIG. 4, six baskets 2 from the first to seventh baskets 21 to 27 except the sixth basket 26 are placed in the first to seventh baskets 21 to 27.
1 to 25, 27, the first to sixth sorting target items E1
-E6 is shown.

Specifically, the first basket 21
The first sorting target product E1 placed on the comparator 2
11 is determined to be the first weight rank, and the second control unit 20 activates the first ejection trigger 81 to tilt the first basket 21 at the first ejection station 41 .
As the operating time, time t1 is calculated from weighing judgment time T1.
remember the rest. The first discharge trigger 81 is operated after a time t1 from the weighing judgment time T1, as shown in FIG. 4(g), and the first basket 21 is tilted at that time, as shown in FIG. The items to be sorted E1 are discharged at the first discharge station 41. Similarly, the second
As shown in FIG. 4(h), the product to be sorted E2 is discharged at the third discharge station 43 by operating the third discharge trigger 83 after a time t3 from the weighing judgment time T2 and tilting the second basket 22. be done. The third and fourth products to be sorted E3 and E4 are moved to the second basket by tilting the third and fourth baskets 23 and 24 by operating the second discharge trigger 82 after time t2 from the weighing judgment times T3 and T4, respectively. It is discharged at the discharge station 42. Fifth
The article to be sorted E5 is discharged at the third discharge station 43, and the sixth article to be sorted E6 is discharged at the second discharge station 42. In the second control unit 20, the time t1 to t3 is determined by the rotary encoder 17.
The time is measured using information regarding the speed of the weighing conveyor 7 inputted from the controller as a clock.

With this configuration, the memory 231
, 232, .
2. If you use the weight setting device 221 and use it by writing in it, and demonstration operation becomes necessary, use the weight setting device 221,
222, without changing the weight rank settings of “
All you need to do is input the “check operation start instruction S1”.The input “check operation start instruction S1” is sent to the test detection unit 25.
The test detection section 25 detects the switch section 241,
242, . . . are switched to the memory 231, 232, . This allows each discharge station 41
, 42 , ...... comparison parts 211 , 212 , ...
. . . executes weight sorting using weight ranks preset in the memories 231 , 232 , . . . .

[0020] To return to normal operation, it is sufficient to input the "confirmation operation end instruction S2". The input “confirmation operation end instruction S2” is recognized by the test detection unit 25, and the test detection unit 25 activates the switch units 241 and 242.
, . . . to the side of the weight setting device 221 , 222 , . This allows each discharge station 41
, 42, . . . , the comparison units 211 , 212 , .
It is not necessary to change the settings of 21, 222, . . . .

In the above embodiment, the operation was carried out in such a way that it was determined at the time of measurement "which discharge trigger 8 should be operated after how many seconds from now", but this was done by determining which discharge trigger 8 should be activated at the discharge station as shown in FIG. The same effect can be obtained by comparing the weighed value of the arriving product to be sorted and its weight rank at the discharge station each time, and operating the discharge trigger 8 of the own discharge station.

In the above embodiment, the endless body 1 rotates horizontally so that the forward and return trips are in the same plane, but as seen in the conventional example shown in FIG. The same applies to the case of the endless body 1 rotating in the direction.

[0023]

[Effects of the Invention] As described above, according to the present invention, there is provided a weight setting device in which an arbitrary weight rank is set for each discharge station, a memory in which the weight rank is a fixed value, and a memory until a confirmation operation instruction is detected. The switch unit outputs the set value of the weight setting device and outputs the fixed value in the memory when a confirmation operation instruction is detected, and the set value outputted by the switch unit is connected to the weight of the item to be sorted measured during transportation. Since the tilting operation of each basket is controlled based on the judgment output of each comparison section, the weight rank during demonstration operation is written in the memory for each discharge station, and normal operation By setting the weight rank of each discharge station in the weight setter of each discharge station, the weight rank input to the comparator can be switched depending on whether it is "demonstration operation/normal operation" and You can switch to "demonstration driving" state or "normal driving" state without changing the weight rank setting of the machine each time, improving operability and changing the weight rank setting during "demonstration driving". It is possible to avoid deterioration in sorting accuracy due to setting errors or weight rank setting errors when returning to "normal operation."

[Brief explanation of drawings]

FIG. 1 is a configuration diagram of a weight rank setting section which is a main part of a weight sorting device of the present invention.

FIG. 2 is a plan view and a front view of the general appearance of the weight sorting device.

FIG. 3 is a basic configuration diagram of an electric circuit of the weight sorting device.

FIG. 4 is a waveform diagram of essential parts of the weight sorting device.

FIG. 5 is a configuration diagram of a conventional weight sorting device.

FIG. 6 is a configuration diagram of a weight rank setting portion of a conventional weight sorting device.

[Explanation of symbols]

1 Endless body 2 Basket 41 to 44 Discharge station 81 to 84
Ejection trigger 9 First control section 20 Second control section 211 to 214 Comparators 221 to 224 Weight setting device 23
Memory 24 Switch section 25 Test detection section

Claims (1)

[Claims] 1. Discharge stations each having a weight rank are arranged along the conveyance path of the endless body, and articles to be sorted are placed in baskets attached to the rotatably driven endless body at predetermined intervals and conveyed. The weight of the items to be sorted is measured during transportation, and when the basket arrives at the discharge station position of the weight rank to which the weight of the item to be sorted belongs, the basket is tilted and the items to be sorted are moved to the corresponding discharge station. In the weight sorting device for discharging, each discharge station has a weight setting device in which an arbitrary weight rank is set, a memory in which the weight rank is a fixed value, and a setting value of the weight setting device until a confirmation operation instruction is detected. a switch unit that outputs a fixed value in the memory when an instruction for a confirmation operation is detected; and a comparison unit that compares the weight of the item to be sorted measured during transportation with the set value output by the switch unit; A weight sorting device configured to control the tilting operation of each basket based on the determination output of each comparison section.