JPH0697180B2 - Weight sorter - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a weight sorter for weighing articles and sorting the articles based on the weighing.

<Prior Art> In a conventional rotary weight sorter, articles are supplied to the present sorter, the weight is detected during one rotation, and the articles are sorted by weight rank. An example of a conventional rotary weight sorter is shown in FIG. 7 and FIG. 8 and explained. The circumference is divided into 6 and arranged at equal intervals, and 6 weighings that rotate and move along this circumference. There is a container h, and each of the weighing containers h has a weight detector j which is supplied with an article at a predetermined rotation position and detects the weight of the article, and an ejection device n which ejects the article whose weight is detected. 6 in different rotating positions of this weighing container h
A chute i is provided below each weighing container h at each of six distribution positions corresponding to the classification of the weight range of the type. The above-mentioned 6 distribution positions are arranged side by side at intervals of 30 °, dividing the circumference into 12 equal parts.

When the article is fed to the weighing container h at a predetermined rotation position, that is, when the weighing container passes through the above-mentioned six sorting positions and is further rotated 90 ° from the position 9d to the final sorting position, the weighing container h is rotated right and the above-mentioned 6 The weight detector j of the weighing container detects the weight at the position 3d, which is before the first distribution position of the distribution positions, and the control device determines the weight rank corresponding to the detection signal from the distribution positions of the six positions. It selects and sends a signal to the discharging device n of the weighing container to discharge and sort the articles at the selected sorting position.

<Problems to be Solved by the Invention> In the above-described conventional rotary weight sorter, the time for determining which sorting position the articles are to be discharged and which sorting position should be discharged is rotationally moved after the articles are supplied to the weighing container. Therefore, it is possible to take only the time until it comes before the sorting position where it first encounters, and within this time, the vibration generated when the article is supplied to the weighing container adds to the detected weight, so the weight accuracy of the article There is a problem that makes it worse.

If the rotation speed of the weight sorter is decreased to increase the weighing time in order to improve the accuracy of the detected weight, there is a problem that the processing capacity of the weight sorter decreases, and the weighing container It is conceivable to increase the number of weighing containers to increase the weighing time per weighing container, but in this case, the number of weight detectors provided in the weighing container also increases, resulting in higher cost and increased weighing. Due to the arrangement of the container, the main body of the machine becomes large and the installation space of the machine becomes large. When the machine main body is made large in this way, there is also a problem that the radius of rotation of the weighing container becomes large, the peripheral speed increases, and it becomes difficult to supply and discharge the articles.

<Means for Solving the Problems> The means of the present invention comprises a plurality of means arranged at equal intervals on the circumference of a circle so as to rotate and move along the circumference, and at a predetermined rotation position. A weighing container having a weight detector for supplying an article and having a weight detector for detecting the weight of the article, and an ejecting device for ejecting the article for which the weight is detected, and a weighing container provided corresponding to each of the weighing containers and synchronized with the rotational movement. And an auxiliary container having a discharging device for discharging the articles, which is provided so as to rotate together and receive the discharging of the articles, and each of which receives the discharging of the articles from the auxiliary container which is defined for different rotation positions of the auxiliary container. Detecting the weight of the articles supplied to the weighing container with a plurality of distribution positions corresponding to different weight ranges and the detection position set near the supply position where the weighing container receives the next supply of goods by the detector. Then, the article whose weight has been detected is discharged to the corresponding auxiliary container until it reaches the supply position, and the article in the auxiliary container is then moved to the corresponding sorting position based on the above weight detection from the weighing container. And a control device for discharging the articles before the articles are discharged.

<Operation> The article supplied to the weighing container is rotationally moved in a fixed direction at a predetermined rotation position, and the weight detector detects the weight of the article at the detection position before the supply position where the weighing container receives the next article supply. Is detected and this signal is transmitted to the control device. The article whose weight has been detected is discharged to the corresponding auxiliary container by the discharge device of the weighing container being activated before the product reaches the supply position. The control device operates the discharge device of the auxiliary container and discharges the article to the corresponding sorting position based on the weight detection signal until the next article is discharged from the weighing container and determines the article in advance. Sort into each stage of a weight range.

<Embodiment> This embodiment will be described by taking the 6-stage weight sorter shown in FIGS. 1 to 6 as an example.

In this example, the weighing container b is divided into six parts at the circumference thereof and arranged at equal intervals. Each of the six weighing containers b has a weight detector g and a discharging device e at the bottom of the weighing container b. And are provided. FIG. 2 is a partial side view of the main body as viewed from the side,
A corresponding auxiliary container c is arranged below each weighing container b, and a discharge device f that operates by supplying and discharging compressed air to and from the air cylinder via a solenoid valve is provided below this auxiliary container c. When the numbers 1 to 6 are attached to identify the six measuring containers b and the auxiliary containers c, respectively, the auxiliary container 1c is located below the measuring container 1b, and similarly, the measuring containers 2b to 6b are sequentially arranged. There are auxiliary containers 2c to 6c (not shown) on the lower side. The measuring container and the auxiliary container are fixed to the same rotating shaft 32 and rotate together in the same positional relationship. The chute a for receiving the sorted articles is provided on the lower side of the auxiliary container by dividing the circumference into 12 equal parts, and arranging the chutes at 6 positions adjacent to each other every 30 °. This is also the number 1 to specify each shoot a
6 is attached and shown as 1a to 6a. Similarly, the weight detector g is also shown as 1 g to 6 g. FIG. 3 is a block diagram of the electric circuit. The weight detectors 1g to 6g detect the weight of the article, and the signal thereof enters the control device 34, the weight rank is determined, and is temporarily stored. . Further, the optical detector 1q for position detection and the optical detector 2q for origin detection output a signal indicating the rotational position of the article to the control device 34, and the control device 34 determines the distribution position corresponding to the determined weight rank of the article. Detection is performed based on the signals of the optical detectors 1q and 2q, and a signal is issued to the discharge device f of the auxiliary container to discharge the article to the sorting position corresponding to the weight rank. FIG. 4 shows a pulse generator for detecting the rotational position of the article and issuing the signal to the control device 34. This pulse generator has a slit plate 37 in the shape of a donut-shaped disc having a slit,
And a detector support 38 to which the optical detectors 1q and 2q are attached. This slit plate has one slit 35 for origin detection with a width and length of about 4 mm on the outer edge of the circle, and the circumference is divided into 12 and equally spaced from the center of the slit plate from the outer circumference. A slit 36 for detecting the position of 12 circular holes having a diameter of about 4 mm is provided slightly inside, and the slit 36 is attached to the fixed portion by aligning the center of the slit plate with the center of the rotary shaft 32. The detector support portion 38 is one rod-shaped arm, and is directed outward in the direction at right angles to the center line of the rotating shaft, and is parallel to the plate surface of the slit plate with a little space. It is attached to the rotating shaft in position. An optical detector 2q for origin detection is attached to the end of the detector support part on the opposite side of the rotating shaft side where this detector support part is attached so that the slit 35 can be detected. An optical detector 1q for position detection is attached so that the slit 36 can be detected at a position slightly closer to the rotation axis side. In this way, the optical detector 1q and
2q is on a straight line extending in the radial direction from the center of the rotating shaft, and is attached to the detector support 38. The detector support portion 38 rotates together with the rotation axis. The optical detector 1q for position detection detects each of the 12 slits 36 each time it makes one revolution around the rotation axis and issues a signal to the pulse counter built in the control device to perform optical detection for origin detection. Similarly, the device 2q detects the slit 35 once every one rotation and sends a signal to the control device. The optical detector 1q sequentially detects the slits 36 for position detection, the pulse counter sequentially counts from 1 by this signal, and when counting 12, the optical detector 2q detects the origin detection slit and detects the pulse counter. Issues a signal that resets the count of 0 to 0.

FIG. 5 shows the pulse signals of the optical detectors 1q and 2q and the count number of the pulse counter.

In this embodiment, the weighing container b and the auxiliary container c are paired and
There are 6 sets in total. The timing when the articles are supplied to one set of the weighing containers b will be described below. Articles are supplied at a position where one set of weighing containers 1b is rotated to the right, passes through the sorting position, and is rotated to the right by 90 ° from the last sorting position 9d. This position is the article supply position 0d, and there is one of the origin detection slit 35 and the position detection slit 36 at this position, and when the weighing container 1b is at the supply position, the optical detectors 1q and 2q also have this position. It is in the supply position.

When the weighing container 1b reaches the supply position, the optical detector 2q sends a signal to the pulse counter to reset the pulse counter to zero. Next, when the weighing container rotates 30 °, the optical detector 1q sends a signal to the pulse counter, the pulse counter counts 1, and when the measuring container further rotates, the pulse counter counts from 1 to 11 and again. When returning to the original supply position, the pulse counter is reset to 0. In this way, each position 0d, 1d, 2d that divides the circumference of the weight sorter into 12 equal parts
The pulse counter counts up to 11d from 0 to 11, and each position corresponds to one count number.

When an article is supplied to the weighing container 1b at the supply position 0d when the pulse counter counts 0, the article rotates rightward, and the weight detector 1g detects the article weight at the position 10d where the pulse counter counts 10 and outputs a detection signal. To the control device 34. The control device 34 determines the weight rank of the article from this detection signal, and temporarily stores this weight rank in the storage device in the control device. At the position 11d where the pulse counter further rotates and the pulse counter counts 11, the discharging device 1e of the weighing container 1b operates to discharge the article from the weighing container to the corresponding auxiliary container 1c. This discharging device for the measuring container is provided with a cam mechanism at the fixed portion, and this cam mechanism operates the discharging device for the measuring container passing through the position 11d. When the weight rank of this article is 3, for example, when the distribution position 6d corresponding to the weight rank 3, that is, when the pulse counter counts 6, the control device 34 operates the ejection device 1f of the auxiliary container 1c to eject the article. . In this manner, the articles are sorted from the supply position while the weight sorter is rotated about twice.

Next, there is a second container 2 on the rear side in the rotation direction of the first set of the measuring container 1b.
The timing of the weighing container 6b of the second set will be explained.
When the weighing container 6b of the set is at the feeding position 0d, the pulse counter counts 2, and the article is fed at this position, and when the weighing container 6b is at 10d, that is, when the pulse counter is 0, the weight detector 6g The weight of the article is detected and a detection signal is sent to the control device. The control device selects the weight rank of the article from this detection signal, and temporarily stores this weight rank in the storage device in the control device. Weighing container 6b rotates 11d
The pulse counter counts 1 at the position. Here, the discharge device of the weighing container operates to discharge the article into the auxiliary container. If the weight rank of this article is, for example, 3, the control device operates the ejection device of the auxiliary container to eject the article at the position where the pulse counter counts 8. In this way, the control device sets the counting counter of the pulse counter by 2 each time the measuring containers are shifted one set to the rear side in the rotation direction from the first measuring container 1b to the second measuring container 6b. With the added count number, the weight detector operates as described above,
It has a circuit for operating the discharge device of the auxiliary container.

In this embodiment, the weighing container b and the auxiliary container c are set to 6 sets, but other sets may be set depending on the size of the weighing item or the sorting processing ability, and the sorting rank of the items is 6 stages. It is also possible to have two or more other selection ranks. In addition, the discharge device of the measuring container is provided with a cam mechanism on the fixed part, and thereby the discharge device of the measuring container is operated.
It is also possible to provide an air cylinder at the bottom of each measuring container, supply and deliver compressed air with a solenoid valve p, and drive this air cylinder to operate the discharging device of the measuring container. The solenoid valve p operates by receiving a signal from the control device 34, and its electric circuit is shown in the block diagram of the electric circuit of FIG.
The block diagram of is enclosed by a dotted line.

<Advantages of the Invention> According to the present invention, since the time during which an article makes one revolution of the weight sorter can be taken during the weighing time of the article, the vibration generated when the article is put into the weighing container is sufficiently attenuated. Therefore, there is an effect that the weight of the article can be accurately measured.

Further, since it is sufficient to provide an auxiliary container which is less expensive than these without increasing the number of weighing containers and weight detectors of the conventional weight sorter, cost increase can be reduced and a compact structure can be achieved. By providing an auxiliary container under each weighing container, there is an effect that processing can be performed at the same speed as the conventional weight selection speed.

[Brief description of drawings]

1 is a plan view of a weight sorter according to the present invention, FIG. 2 is a partial front view of a weighing container and an auxiliary container of the same weight sorter, and FIG. 3 is a block diagram of an electric circuit of the same weight sorter. FIG. 4 is a plan view of a slit plate, an optical detector for position detection and an optical detector for origin detection, and FIG. 5 is a pulse signal of the optical detector for position detection and origin detection and a pulse counter of the controller. 6 shows the count number of the pulse counter when the optical detector reaches each position on the circumference, and FIG. 7 shows the distribution position of the pulse counter. FIG. 7 shows the plane of the conventional weight sorter. FIG. 8 is a partial front view of a weighing container and an auxiliary container of a conventional weight sorter. 1 (1a to 6a) ... chute, b (1b to 6b) ... weighing container, c (1c to 6c) ... auxiliary container, 34 ... control device.

Claims (1)

[Claims] 1. A plurality of articles are arranged on a circumference of a circle at equal intervals so as to rotate and move along the circumference of the circle, articles are supplied at a predetermined rotation position, and the weight of the articles is detected. A weighing container having a weight detector and a discharging device for discharging a weight-detected article, and the weighing vessel provided corresponding to each of the weighing vessels, are rotated together in synchronism with the rotational movement to discharge the article. An auxiliary container provided with a discharge device for discharging the article, and a plurality of distribution positions corresponding to different weight ranges defined for different rotation positions of the auxiliary container and receiving the discharge of the article from the auxiliary container; , The weight of the article supplied to the weighing container is detected by the detector at a detection position defined in front of the supply position where the weighing container is next supplied with the article, It is discharged to the corresponding auxiliary container before reaching the supply position, and the articles in the auxiliary container are discharged to the corresponding sorting position based on the above weight detection until the article is next discharged from the weighing container. A weight sorter consisting of a control device.