JPH04285823A - Method and device for controlling dispersing/feeding apparatus - Google Patents

Abstract

PURPOSE:To feed articles of an approximately fixed volume to each measuring hopper at all times so that mainly an automatic combination balance can display stable and efficiency. CONSTITUTION:Articles are sent out by a cross head feeder 30 in a predetermined transverse direction over a dispersing feeder 51 to be supplied onto the feeder 51. The articles are sent to a peripheral part of the feeder 51 and further outward by a straight, feeder 52. A load sensor 59 can obtain the direction and degree of the shift of the central position of the load of the articles on the feeder 51 from a target point, which is a predetermined position on a straight axis parallel to the predetermined direction, as components in the direction of the straight, axis. This device is provided with a moving device 32 which supports and moves the load sensor 59 and a feed chute 31 in a movable manner in tone direction of the straight axis, and a driving controlling part which drives the moving device 32 on the basis of tone components in the direction of the straight, axis obtained by the load sensor 59 thereby to move the feed chute 31 in a direction opposite to the direction of the shift.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] This invention is mainly used for automatic combination weighers, and the weighing hopper is designed to uniformly load articles into each weighing hopper so that the weigher always maintains an optimal combination and exhibits stable accuracy and performance. The present invention relates to a control method and apparatus for a distributed supply device.

0002

2. Description of the Related Art A combination weigher used in a conventional distributed feeding device is shown in FIG. In the figure, articles 3 that have been conveyed and raised by a bucket conveyor 1 are fed into a funnel-shaped supply funnel 4 by a horizontal feeder (crosshead feeder) 2. Immediately below the supply funnel 4 there is an umbrella-shaped dispersion feeder 5 which delivers the articles 3 to its periphery and into several straight feeders 6 arranged radially around the dispersion feeder 5. supply Following the delivery end of each linear feeder 6 is a respective feed hopper 7, and below each feed hopper 7 is a respective metering hopper 8. These hoppers 8 are arranged on a circumference concentric with the distributed feeder 5 in plan view. Articles discharged from the weighing hopper 8 are collected by a collection chute 9 and packed into bags, boxes, or the like. Such combination scales are now widely known. In such a combination weigher, when the number of weighing hoppers is 10, the amount of articles fed into the weighing hopper 8 for one batch is usually kept at 1/4 to 1/5 of the target weight. This is because when a combination of 4 to 5 out of 10 weighing hoppers is selected, the number of combinations is the largest, and this increases the weighing accuracy. However, the conventional distributed feeding device described above, namely the feeding funnel 4, the distributed feeder 5,
An apparatus in which the linear feeder 6 is simply connected cannot necessarily supply the desired uniformity to each hopper due to the properties of the articles (clumps, tangles, etc.) and fluctuations in the supply speed. Furthermore, when the capacity is changed or the articles are changed, it is necessary to confirm and correct the uniformity of the supply condition each time, and it is difficult to supply the articles to each hopper as uniformly as possible.

[0003] Therefore, as one element for increasing the precision of the combination weigher, it may be effective to regulate the weight of the articles in the weighing hopper 8 as uniformly as possible. That is, for example,
This is because if the combination target value is 400 g and the combination is to be obtained using four weighing machines, it is desirable that the articles in each weighing hopper be distributed with as small a deviation as possible around 100 g. .

The regulation of the amount of articles supplied to the weighing hopper 8 of the conventional apparatus is based on the need to keep the layer thickness h of the articles on each linear feeder 6 at a predetermined value as much as possible. When charging, the distance between the supply funnel 4 and the dispersion feeder 5 is adjusted in order to adjust the layer thickness h of the articles on the linear feeder 6, or the relationship between the central axes of the supply funnel 4 and the dispersion feeder 5 is corrected. This was done manually based on the observations of all operators. These tasks are the most time-consuming part of the adjustment work for the combination weigher. The operator must pay special attention to the above-mentioned uneven supply due to the properties of the article, and requires skill.

[0005] As a conventional technique for solving such problems, there is one disclosed in Japanese Patent Laid-Open No. 2-136717.

[0006]

[Problems to be Solved by the Invention] The technique disclosed in the above publication has the following problems. That is, the load sensor uses the center position of the load caused by the articles on the distributed feeder and the linear feeder as the origin, and the eccentricity with respect to the origin is determined in the X-axis direction and the Y-axis direction.
Since it is detected as each component in the axial direction, load sensors corresponding to each of the X-axis direction and the Y-axis direction are required, and there is a problem that a large number of load sensors are required. The moving device for moving the center position of the load to the origin consists of an X-axis direction drive section that moves the article exit portion of the supply device in the X-axis direction and a Y-axis direction drive section that moves it in the Y-axis direction. Therefore, there are problems in that the structure becomes complicated and the cost increases. In addition, due to the complex structure,
The height of the combination scale is high, and when installing it, the relationship with the height of the ceiling may become a problem.

SUMMARY OF THE INVENTION An object of the present invention is to provide a control method and apparatus for a distributed supply device that solves the above-mentioned problems.

[0008]

[Means for Solving the Problems] A control method for a distributed feeding device according to a first aspect of the invention includes feeding an article onto the distributed feeder by feeding the article in a predetermined direction across the distributed feeder;
In a dispersion feeding device configured to feed the article to the periphery of a dispersion feeder and further to the outside of the dispersion feeder using a plurality of linear feeders, a straight line parallel to the predetermined direction that crosses above the dispersion feeder. A predetermined position on the axis is set as a target point, and the direction of eccentricity, or the direction of eccentricity and the degree of eccentricity of the center position of the load by the article on the distributed feeder and the linear feeder or on the distributed feeder is determined on the linear axis. and, based on the component in the linear axis direction, move the supply position of the article to the dispersion feeder of the feeding device along the linear axis direction in a direction opposite to the direction of the eccentricity. do.

[0009] The control device for the distributed supply device of the second invention includes:
A supply device feeds the article in a predetermined direction across the distribution feeder, the article is fed onto the distribution feeder, the article is sent to the periphery of the distribution feeder, and then further sent out to the outside of the distribution feeder by a plurality of linear feeders. In the distributed feeding device configured as follows, a load due to the article on the distributed feeder and the linear feeder or on the distributed feeder is set at a predetermined position on a linear axis parallel to the predetermined direction that crosses the distributed feeder. a load detection device provided to obtain the eccentricity direction or the eccentricity direction and the degree of eccentricity with respect to the target point of the central position of the center position as a component in the linear axis direction; a moving device that supports the article so as to be movable in the linear axis direction and moves the article outlet portion along the linear axis direction; and a component in the linear axis direction obtained by the load detection device. and a drive control unit that operates the moving device based on the movement of the article so that the article exit portion moves in a direction opposite to the direction of the eccentricity.

[0010] A control device for a distributed supply device according to a third aspect of the invention includes:
3. The control device for a distributed feeding device according to claim 2, wherein at least an article exit portion of the feeding device is movable in the linear axis direction with respect to the distributed feeder without providing the moving device and the drive control section. a manual position changing device supported by the article outlet portion so as to fix the article exit portion at a desired position on the linear axis; and a display device for displaying the component in the linear axis direction obtained by the load detecting device. It is characterized by having the following.

A control device for a distributed supply device according to a fourth aspect of the invention includes:
A supply device feeds the article in a predetermined direction across the distribution feeder, the article is fed onto the distribution feeder, the article is sent to the periphery of the distribution feeder, and then further sent out to the outside of the distribution feeder by a plurality of linear feeders. In the dispersion feeding device configured as such, the proximal end is fixed, and the dispersion feeder extends from the proximal end in parallel to the predetermined direction across the dispersion feeder, and the dispersion feeder on the dispersion feeder and the linear feeder or the dispersion feeder extends from the proximal end in parallel to the predetermined direction across the dispersion feeder. It comprises an elastic flexure element having a force receiving part that receives the load from the above-mentioned articles on the feeder (hereinafter simply referred to as "articles on the distributed feeder"); A load sensor has four strain gauges attached to the surface of the strain body perpendicular to the plane along the receiving direction, and the four strain gauges are connected to a bridge circuit; A predetermined position on a linear axis parallel to the direction is a target point, and the direction of eccentricity or the direction of eccentricity and the degree of eccentricity of the center position of the load due to the article on the distributed feeder with respect to the target point is determined based on the output signal of the bridge circuit. an arithmetic control unit that calculates as a component in the linear axis direction; and a calculation control unit that supports at least an article outlet portion of the feeding device so as to be movable in the linear axis direction with respect to the dispersion feeder, and supports the article outlet portion in the linear axis direction. A moving device is provided to move the article along the axis, and the moving device is operated based on the component in the linear axis direction calculated by the arithmetic control unit, and the article exit portion is moved in a direction opposite to the direction of the eccentricity. The invention is characterized by comprising a drive control unit that drives the drive control unit to perform the following operations.

[0012] A control device for a distributed supply device according to a fifth aspect of the invention includes:
5. The control device for a distributed feeding device according to claim 4, wherein at least an article exit portion of the feeding device is freely movable in the linear axis direction with respect to the distributed feeder without providing the moving device and the drive control section. a manual position changing device that is supported by the article exit portion and is provided to fix the article exit portion at a desired position on the linear axis; a display device that displays the component in the linear axis direction calculated by the arithmetic and control unit; It is characterized by having the following.

[0013]

[Operation] The first to fifth inventions supply the articles to a predetermined target point to an extent that supplements the articles on the distributed feeder, and the articles on the distributed feeder and the linear feeder or on the distributed feeder (
Hereinafter, it will simply be referred to as "articles on the distributed feeder." ) so that the center of the load is at a predetermined target point on the dispersion feeder, thereby increasing the quantity of articles distributed in each direction. However, when using this distributed feeding device in an automatic combination scale, the properties of the articles, the individual weights of the articles,
If weighing accuracy, etc. increases when the weight of the articles fed to each hopper is made uniform by making the center of the load the center of the distributed feeder depending on the feeding speed, etc., set the target point at the center of the distributed feeder. Or, if weighing accuracy increases when the weight of the articles fed to each hopper is slightly varied by slightly shifting the center of load from the center of the distributed feeder, move the target point to the distributed feeder. It is best to set it slightly off center.

When the load detection device detects the eccentric direction of the center position of the load due to the articles on the distributed feeder, it changes the supply position of the article to the distributed feeder in the direction opposite to the eccentric direction from the previously supplied position. The degree of eccentricity can be reduced by moving some distance in the direction. At this time, the supply position of the article is moved along a linear axis parallel to the direction in which the article is sent out by the supply device. For example, if a relatively small movement of a certain distance is performed once for each eccentricity direction detection, even a fairly large eccentricity can be corrected by several movements, so the eccentricity direction detection and movement can be performed in a short period of time. By repeating this at intervals, a state can be obtained in which the center position of the load due to the article is hardly eccentric in the direction of the linear axis with respect to the target point. In addition, when the direction and degree of eccentricity of the center position of the load due to the article on the distributed feeder are detected, the supply position of the article to the distributed feeder is changed from the position where it was being supplied in the opposite direction to the eccentric direction. The degree of eccentricity can be appropriately reduced by moving along the linear axis a fixed distance or a distance corresponding to the degree of eccentricity. By maintaining the state in which the center position of the load caused by the article coincides with the target point in this manner, the quantity of the article supplied from the distributed supply device is improved. In other words, according to the control method and control device of the invention, the dispersion supply device can be operated in a dispersion supply operation with high uniformity at all times, or while maintaining a predetermined weight variation in each direction of dispersion.

Note that by moving the article supply position along the linear axis, only the eccentricity in the direction of this linear axis is reduced;
The reason why the quantity of articles supplied from the distributed feeder was achieved by this is that the direction in which the supply device feeds the articles to the distributed feeder is parallel to the direction of the linear axis. . In other words, since the feed direction of the article is fixed, even if the properties of the article or the amount of feed, etc. change, the center position of the load of the article (the supply position of the article on the dispersion feeder) will remain unchanged. This is because there is little deviation in the direction perpendicular to the direction. Even if there is a discrepancy, the uneven supply of goods caused by the discrepancy will be
No problems arise in general use of this distributed feeding device.

[0016] In the apparatuses of the second and fourth inventions, the load detection device (or load sensor and arithmetic control unit) determines that the center position of the load due to the articles on the distributed feeder is in the direction of the linear axis with respect to the target point. Since the fact that it is eccentric or eccentric in the direction of the linear axis and the degree of eccentricity can be obtained as a component in the linear axis direction, the drive control unit operates the moving device based on this component in the linear axis direction. The article exit position of the supply device is moved along the linear axis in a direction opposite to the eccentric direction. If only the direction of eccentricity is detected, a relatively small distance is determined in advance and the movement is made a certain distance.If the direction and degree of eccentricity are detected, the distance is fixed. It will be moved by a distance or a distance depending on the degree of eccentricity. As a result, the supply position of the article fed from the supply device onto the distributed feeder moves, and the center of the load due to the article on the distributed feeder moves in the direction toward the target point, so that the degree of eccentricity is reduced. If this operation is repeated at appropriate intervals, the center of the load caused by the articles on the distributed feeder will be maintained at approximately the target point, so the amount of articles fed in each direction from the distributed feeder will always be constant. It becomes highly quantitative.

Further, in the devices of the third and fifth inventions, the display section displays the linear axis direction component (the eccentric direction or the eccentric direction and the eccentric direction) obtained by the load detection device (or the load sensor and the calculation control section). degree). If the direction of eccentricity is displayed on the display, the operator operates the manual position change device to change the article exit position of the feeding device along the linear axis in the opposite direction to the direction of eccentricity. Make it move. If the direction and degree of eccentricity are detected on the display,
Similarly, the manual repositioning device is operated to move a fixed distance or a distance depending on the degree of eccentricity. As a result, the center of the load due to the articles on the distributed feeder can be maintained in a state that substantially coincides with the target point.

[0018]

Embodiment A first embodiment is shown in FIGS. 1 to 7. This example was implemented in a distributed feeding device built into a combination weigher. The control device for the distributed supply device includes a moving device 32, a load sensor 59, an eccentricity deviation amount calculator 61, and a calculator 62. In the figure, 20 is a supply device, 21 is a distributed supply device, 22 is a supply hopper, and 24 is a collection chute.

The feeding device 20, as shown in FIG. 1, feeds the article to be weighed 25 to the combination weigher, and includes a crosshead feeder 30 that feeds and stops feeding according to commands from the combination weigher; A feed chute 31 forming the outlet part of the device 20 is supported by a displacement device 32 . As shown in the figure, the crosshead feeder 30 is provided substantially horizontally on the distributed feeding device 21.

The moving device 32 is a machine frame 33 of a combination weigher.
It consists of a fixed frame 34, a movable frame 36, and a linear axial drive section 37. The moving device 32 is provided corresponding to a horizontal linear axis 38 having an origin and a target point, which will be described later, and is configured to move the supply chute 31 in the direction of the linear axis 38. A fixed frame 34 is supported in a height-adjustable manner by two supports 39 erected on the machine frame 33, and a movable frame 36 is supported by the fixed frame 34 so as to be movable in the direction of a linear axis 38. The linear axial drive unit 37 includes a motor 41 provided on the fixed frame 34, gears 42, 43, and a male screw 44 that is fixed at one end to the movable frame 36, extends in the linear axis direction, and is screwed into the center hole of the gear 43. Become. When the gear 43 rotates, the male screw 4
4 moves in the linear axis direction. In the figure, 49 is gear 4
This is a bearing that rotatably supports 3.

The distributed feeding device 21 is located at the center of the combination weigher, receives the articles from the feeding device 20, and supplies the articles in approximately fixed amounts to each of the 10 supply hoppers 22 located outside and below the feeding device 20. It consists of a distributed feeder 51 and ten straight feeders 52. The dispersion feeder 51 includes a vibrator 54 provided at the bottom of an umbrella-shaped dispersion table 53.
It is supported by a support plate 55 via a spring 45. This support board 55 is supported by a feeder support stand 58 provided on the machine frame 33 via a load sensor 59. Straight feeder 5
2 are independently provided radially outward from each position dividing the outer periphery of the distribution table 53 into 10 parts, and the gutter-like portions 5
Each of the feeders 6 has a vibrator 57 at its lower part, and is supported by a feeder support stand 58 via a spring 46.

In the load sensor 59, as shown in FIG. 7, the base end of a load cell (elastic flexure element) 40 is fixed to a feeder support stand 58, and a force receiving portion 47 is provided at the tip. The upper end of this force receiving portion 47 is attached to the center position of the distributed feeder 51. As shown in FIG. 3, the aforementioned linear shaft 38 passes through this central position.

The supply hopper 22 is located at the lower part of the outer tip of each linear feeder 52, and each weighing hopper 23 is located at the lower part of the supply hopper 22, and all of the weighing hoppers 23
Collection chute 24 that can collectively discharge the discharged items from the
is located at the bottom. Since these structures are well known, detailed illustrations are omitted.

[0024] This combination weigher performs combination weighing and changes the feeding position of the articles fed onto the dispersion feeding device 21 during the combination weighing. In the combined metering operation, the feeder 20 feeds the article 25 so that there is always a substantially constant, appropriate amount of the article 25 on the distributed feeder 21, and when any of the feed hoppers 22 is empty, The process of repeatedly supplying a substantially constant amount of articles 25 by the corresponding linear feeder 52 and stopping the process is repeated. Then, when one of the weighing hoppers 23 becomes empty, the feeding operation of the corresponding supply hopper 22 is repeated, and the weighing hopper 23 to which the article 25 is supplied immediately detects the article weight, and based on the detected weight. Several weighing hoppers 23 are selected so as to achieve the target weight,
The discharge operation of each selected weighing hopper 23 is repeated.

When the center of the load caused by the articles 25 on the distributed feeder 51 is eccentric from the target point on the linear axis 38, the feeding position of the articles fed onto the distributed feeding device 21 can be changed by changing the direction of the eccentricity. The moving device 32 determines the degree of eccentricity based on the detection result of the load sensor 59 based on a command from the drive control circuit 71 (shown in FIG. 6).

Now, if the load caused by the articles on the distributed feeder 51 shown in FIG. FIG. 7 shows the stress acting on the load cell 40. Due to the bending moment caused by this load W, stress σ acts as a tensile force in portions A and D of the load cell 40, and acts as a compressive force in portions B and C of the load cell 40. This stress σ
is, σ=K1 ・W
It is expressed as (1). However, K1 is a proportionality constant.

[0027] Also, depending on the load W and the amount of eccentricity e, W・e
moment is generated, and forces f1 and f2 of W・e/d
acts on the upper lever 46 and lower lever 47 of the load cell 40, as shown in the figure. However, d is the vertical dimension of the right end portion of the load cell 40. This force f1 acts on parts A and C as tensile stress σ', and force f2 acts on parts B and D as compressive stress -σ'. This stress σ' is σ'=K2 ・W・e (
2). However, K2 is a proportionality constant.

FIG. 4 is a block diagram of the load sensor 59 and the calculation section 62. As shown in FIG. 4, the load sensor 59 is a strain gauge RA connected to the bridge circuit.
It has RB, RC, RD, and each gauge RA
RD to RD are attached to portions A to D of the load cell, respectively. Each of the gauges RA to RD detects each stress acting on the A section to the D section. As shown in the figure, if the output voltage at the connection between strain gauges RA and RB of the bridge circuit is v1 and the output voltage at the connection between strain gauges RC and RD is v2, then v1 and σ, σ'
, v2 and σ, σ' are v1 = K3 (σ+σ'),
There is a relationship of v2 = K3 (σ'-σ). However, K
3 is a proportionality constant.

The output voltages v1 and v2 are input to the calculation section 62 as shown in FIG. /D conversion and outputs a digital signal W0 corresponding to the load W. Further, the summation amplifier 64 calculates the addition value of v1 +v2, and the A/D converter 65
This signal M0 is A/D converted by the load signal W0 by a divider 66, and a digital signal e0 corresponding to the eccentricity e is output. That is, the output W0 of the calculation unit 62 is W0 = v1 - v2 = K3 (σ+σ') - K3 (σ' - σ) = 2K3
σ From formula (1), = 2K1 ・K3 ・W Then, the output M0 of the adder 64 is M0 = v1 + v2 = K3 (σ + σ') + K3 (σ' - σ) = 2K3
σ' From formula (2), =2K2 ・K3 ・W・e Also, the output e0 of the divider 66 is e0 = (v1 + v2 )/(v1 - v2 ) = 2
K2 K3 We/2K1 K3 W=K2 e/K1
becomes. Here, in order to know which direction of the linear axis 38 the eccentric position is, it can be determined whether the signal e0 representing the eccentricity e is positive or negative. Note that the calculation unit 62 includes a calculation unit initial regulator 67 and a supply amount control unit 6.
8, a sensitivity adjuster (not shown), etc. are connected thereto. A signal e0 representing the direction of the eccentric position and the amount of eccentricity e obtained by the calculation unit 62 is input to the eccentricity deviation amount calculation unit 61.

As shown in FIG. 5, the eccentricity deviation amount calculator 61 is connected to an eccentricity amount setter 69 and a drive control circuit 71 in addition to the calculation section 62. This drive control circuit 71
A control timing signal generator 70 and a motor 41 are connected to the control timing signal generator 70 and the motor 41. The eccentricity setting device 69 is connected to the distributed feeder 51
This is to set a target point (eccentricity setting value es) in order to eccentrically shift the center position of the load caused by the above article from the center position (origin) of the distributed feeder 51 by a desired distance in the direction of the linear axis 38. be. Note that when the target point is set to 0, the center position (origin) of the distributed feeder 51 becomes the target point of the linear axis. Also, set the eccentricity amount es to 3, for example.
When set to 0 (or -30), the target point is a position that is, for example, 30 mm away from the center position of the distributed feeder 51 along the linear axis 38 in a predetermined direction (or the opposite direction). Then, the drive control circuit 71 and the moving device 32 operate so that the center position of the load due to the articles on the distributed feeder 51 coincides with this target point. The reason for providing the eccentric amount setting device 69 is to prevent the weight of the articles supplied to each weighing hopper 23 from becoming uniform, and to ensure that the weight of each article supplied to each weighing hopper 23 is within a predetermined weight range. This is to allow variation. That is, for example, article 1
The weight per piece is relatively large and almost uniform (e.g. 10g)
, and the target weight of the combined weighing is 190 g. In such a case, if the weight of the article to be supplied to each weighing hopper 23 is set to be 40 g, for example, if the number of weighing hoppers 23 to be selected in combination is 5, it will be 200 g, and if there are 4, it will be 160 g. In the case of , the weight is also different from 190g. Therefore, in order to make the total weight of the articles to be combined be 190 g, each weighing hopper 23
By varying the weight of the articles within the range, for example, between 30 g and 40 g, four weighing hoppers 23 that accommodate 40 g articles and one weighing hopper 23 that accommodates 30 g articles are selected to bring the total weight to 190 g. It can be done.

The control timing signal generator 70 is a device that sets the timing for correcting the eccentricity of the center position of the load with respect to the target point by operating the moving device 32. For example, if the number of times of combined weighing is set, the setting The moving device 32 can be operated every time the combined weighing is performed the specified number of times. For example, once in 100 combination weighings, or 5
When a control timing signal is input to the drive control circuit 71 at regular intervals of once every 0 times, the drive control circuit 71 operates the moving device 32. However, the number of times set by the control timing signal generator 70 depends on the ability of the supply device 20 to supply the article, the distributed feeder 51 and the straight feeder 52.
It is necessary to make a determination based on the amount of articles held thereon and the amount of articles fed into the feed hopper 22 by one combined metering. For example, if the supply position of the article onto the distributed feeder 51 is changed this time by activating the moving device 32, the center position of the load of the article on the distributed feeder 51 will be moved toward the target point by the above change. After that, it is preferable to have the moving device 32 perform the next operation.

As shown in FIG. 5, when the eccentricity deviation amount calculator 61 receives the signal e0 from the calculation unit 62, it subtracts the eccentricity amount setting value es from the signal e0 to calculate a subtracted value. The obtained signal is output to the drive control circuit 71. This drive control circuit 71 is (e0 −es )
The motor 41 is driven so as to cancel out the deviation of the supply chute 31, thereby making it possible to move the outlet position of the supply chute 31. Then, depending on the result, if the correction is still insufficient, the next time the control timing signal is input,
Further correction operation is performed, and this deviation (e0 - es) becomes 0.
Repeat this correction operation until

Further, the signal W0 representing the load W outputted from the calculation section 62 is inputted to the supply amount control section 68 as before. The supply amount control unit 68 estimates the layer thickness of the article on the dispersion feeder 51 based on this signal W0, controls the supply amount from the crosshead feeder 30, and corrects the layer thickness to a desired target value.

However, the load sensor 59 and calculation section 6 in FIG.
2 and the eccentricity deviation amount calculator 61 are the load detection device according to the second and third aspects, and the drive control circuit 71 is the drive control section according to the second and fourth aspects. The calculation unit 62 and the eccentricity deviation amount calculation unit 61 are calculation control units according to claims 4 and 5.

When operating a combination weigher incorporating the distributed feeding device 21 having such a control device, in addition to setting each part for combination weighing, the initial adjuster of the load sensor 59 adjusts the output value at no load. Match them. When the center of the load caused by the articles on the distributed feeder 51 deviates from the target point of the linear axis during operation, the direction of eccentricity and the degree of eccentricity are determined by the calculation unit 62 and the eccentricity deviation amount calculation unit 61 based on the detection signal from the load sensor 59. It is calculated by Then, the eccentricity deviation amount calculator 61 provides a signal corresponding to the direction and degree of eccentricity to the drive control circuit 71. Drive control circuit 7
1, the number of combined measurements is controlled by the timing signal generator 7.
When the number of times set by 0 is reached, the motor 41 is operated and the supply chute 31 is moved in the opposite direction to the eccentric direction by a large distance if the degree of eccentricity is large, or a short distance if it is small, depending on the degree of eccentricity. It will be moved. As a result, the position where the articles are fed onto the distributed feeder 51 moves to the side where fewer articles are being fed on the distributed feeder 51, so that the center of the load due to the articles on the distributed feeder 51 is shifted to the target of the linear axis 38. Corrected to get closer to the point. Note that the distance and direction between the origin and the center position of the distributed feeder 51 are determined by the set value es set by the eccentricity setting device 69.

FIG. 7 shows the main parts of the second embodiment. In this embodiment, a gutter 74 and a moving plate 75 are provided in place of the supply chute 31 and moving frame 36 in the first embodiment. The other parts are the same as those in the first embodiment, and detailed explanation thereof will be omitted.

The gutter 74 is disposed at the article outlet of the crosshead feeder 30, as shown in FIG. 7, and is attached to a moving plate 48, which will be described later. This gutter 74 further guides the articles sent out from the article outlet of the crosshead feeder 30 to the left side in the figure, and supplies the articles onto the dispersion feeder 51. Although not shown in the figure, the moving plate 48 is slidably provided along the crosshead feeder and is connected to the left end of the male thread 44. That is, when the male screw 44 is rotationally driven by the motor 41 and moves in a predetermined direction, either left or right in the figure, the gutter 74 moves in the same direction together with the moving plate 75. This allows the supply position of the articles to be fed onto the distributed feeder 51 to match the target point or to bring it close to the target point, and similarly to the first embodiment, the center position of the load of the articles on the distributed feeder 51 can be adjusted to the target point. Can be matched to a point.

A third embodiment will be explained. In this embodiment, the drive control circuit 71, control timing signal generator 70, motor 41, and supply amount control section 68 in FIG.
A storage section 76, an eccentricity reading timing signal generator 90, and a display section 77 are provided. Furthermore, a handle (not shown), for example, is provided in place of the motor 41 so that the male screw 44 shown in FIG. 2 can be manually rotated. The storage section 76 is connected to the calculation section 62 , the eccentricity deviation amount calculator 61 , the eccentricity amount setter 69 , the eccentricity amount reading timing signal generator 90 , and the display section 77 . In other words, the storage section 76 stores the output signal e0 from the calculation section 62 which performs the same operation as in the first embodiment, and the eccentricity deviation amount calculation unit 6.
Output signal e0 -es from 1 and eccentricity setting device 69
The output signal es from is input. When the read signal from the eccentricity reading timing signal generator 90 is input, the storage section 76 temporarily stores each output signal and causes the display section 77 to display each output signal. As a result, the worker can read the eccentricity e0 −e displayed on the display section 77.
s is read and the handle is manually rotated to move the supply chute 31 in the opposite direction to the eccentric direction so that the amount of eccentricity is reduced. However, other parts are the same as those in the first or second embodiment, and detailed explanation thereof will be omitted.

This embodiment can be used when the variation in the center position of the load of the article fed by the feeding device 20 is relatively small. It can also be used to easily adjust the position of the supply chute during machine installation or maintenance. According to this embodiment, the structure is simple and the cost can be reduced accordingly.

However, in the first to third embodiments described above, the calculation section 62 includes the A/D converters 63 and 65 and the digital divider 6.
6 and outputs the signal W0 and the signal e0 as digital signals, but the A/D converters 63 and 65 are removed and the digital divider 66 is replaced by an analog divider (not shown). ) and output the signal W0 as an analog signal.
, signal e0 can be output. In each of the above embodiments, the eccentricity setting device 69 is provided, but if there is no need to change the target point, the eccentricity setting device 69 may not be provided. Further, in each of the above embodiments, the layer thickness of the article on the dispersion feeder 51 is approximately constant, and the supply device 20
If it is not necessary to control the supply amount of the load, that is, the output signal W0 shown in FIG. Deviation amount calculator 61 and drive control circuit 7
By keeping the sensitivity of 1 sufficiently low, the subtraction amplifier 78, A/D converter 63, and divider 66 can be omitted.

Furthermore, as shown in FIG.
Although the force receiving part 47 is attached to the center position of the distributed feeder 51, the force receiving part 47 can be attached to a position eccentric from the center position. In this case, by performing offset processing in the calculation unit 62, the calculation unit 62 can output the output signals W0 and e0 as in the above embodiment. In each of the above embodiments, the load sensor 59 supports the distributed feeder 51 and receives the load signal W of the article on the distributed feeder 51.
0 and eccentricity, etc., but the load sensor 59 is configured to support the distributed feeder 51 and all the linear feeders 52, and the distributed feeder 51
and the load signal W0 of the articles on all the linear feeders 52
It is also possible to detect the signal e0 such as the amount of eccentricity and the amount of eccentricity.

[0042] Furthermore, as described above, the arithmetic unit 62
Although the configuration is shown in FIG. 9, the calculation section 79 shown in FIG. 9 can be used without providing the calculation section 62. This calculation section 7
9 includes an addition/subtraction amplifier 80 and an A/D converter 81. When the switch 82 is switched to the upper position in the figure (the position shown by the solid line) by the CNT signal from the microcomputer (CPU), the addition/subtraction amplifier 80 operates as a subtraction amplifier and outputs a weight signal. The A/D converter 81 A/D converts this weight signal to generate an output signal W0. Further, when the switch 82 is switched to the lower position in the diagram (the position indicated by the broken line) by the CNT signal from the CPU, the addition/subtraction amplifier 80 operates as an addition amplifier and outputs a moment signal. Then, the A/D converter 81 A/D converts this moment signal to generate an output signal M0. These output signals W0 and M0 are input into the CPU, and the signal M0 is W0
A signal e0 representing the amount of eccentricity is calculated. In this way, similarly to the above embodiment, the output signals W0,
e0 can be obtained.

[0043]The load sensor 59 actually shown in FIG.
A subtraction amplifier 78 and an A/D converter 63 are provided, and based on this output signal W0, for example, the dispersion feeder 5
In a combination balance capable of detecting only the layer thickness of the article on item 1, the summing amplifier 64 as described in the above embodiment
, the A/D converter 65 and the divider 66 are connected as shown in FIG. 4, so that output signals W0 and e0 can be generated to detect the layer thickness, the direction of eccentricity, and the degree of eccentricity. It can be a combination scale that can be used.

Further, in the first embodiment, as shown in FIG. 5, the drive control circuit 71 includes a control timing signal generator 70.
However, instead of connecting this control timing signal generator 70, an eccentricity correction amount setting device may be connected. Alternatively, an eccentricity correction amount setting device may be provided in addition to the control timing signal generator 70, so that either one of the two can be selectively connected to the drive control circuit 71. Note that the eccentricity correction amount setter is a device that can set the amount of movement of the supply chute 31 for one time by setting a distance. However, in this case, the drive control circuit 71 determines the control interval based on the number of operations based on the result obtained by the eccentricity deviation amount calculator 61. That is, if the degree of eccentricity is large, the control interval is determined to be a short interval, and if the degree of eccentricity is small, the control interval is determined to be a large interval. At the determined intervals, the drive control circuit 71 operates the motor 41 to move the supply chute 31 a certain distance in a direction opposite to the eccentric direction. This corrects the eccentric load center so that it approaches the target point.

[0045]

Effects of the Invention The first to fifth inventions are such that the direction in which the supply position of the article fed from the supply device onto the dispersion feeder changes due to changes in the properties of the article and the amount of supply is a predetermined direction that traverses the top of the dispersion feeder. This was done in consideration of the fact that the center position of the load due to the articles on the distributed feeder and the linear feeder or on the distributed feeder is parallel to the target point in either direction of the linear axis or in any direction. Since the direction and degree of eccentricity can be obtained as components in the direction of the linear axis, it is sufficient to provide a load sensor corresponding to this one linear axis. In comparison, there is an effect that the number of load sensors can be reduced.

The moving device or manual position changing device for moving the center position of the load caused by the article to the target point is one that moves at least the article outlet portion of the supply device back and forth in the linear axis direction. Therefore, the structure is simpler and the cost is lower than that of the conventional one. And since the structure is simple,
If this device is installed in, for example, a combination weigher, it will have the effect of making the length shorter than the same conventional weighing device.

Furthermore, as shown in the above embodiment, when a load sensor (for example, a Roberval type load cell) is provided for measuring the weight of the article on the distributed feeder and detecting the layer thickness of the article, By performing arithmetic processing on the output of the load sensor, it is possible to provide the above-mentioned eccentricity detection function that is inexpensive, has a simple structure, and satisfies the requirements for general use.

Furthermore, if the properties, feeding speed, etc. of the articles do not change much during the distributed supply of articles, and therefore there is no need to frequently correct the supply position of the articles fed from the supply device, the third method may be used. The control device of the invention can be utilized. The third invention is not provided with a motor for moving the article exit portion of the supply device and a drive control circuit for driving the motor, and can have a simpler structure than the second invention. It can be made even cheaper.

[Brief explanation of the drawing]

FIG. 1 is a partially sectional front view of a first embodiment of the invention.

FIG. 2 is a partial cross-sectional plane of the moving device of the first embodiment.

FIG. 3 is a partially enlarged plan view showing the installation state of the load sensor of the first embodiment.

FIG. 4 is a block diagram showing a load sensor and a calculation unit of the first embodiment.

FIG. 5 is a block diagram of main parts of the first embodiment.

FIG. 6 is an enlarged front view of the load sensor of the first embodiment.

FIG. 7 is a partially sectional front view of a second embodiment of the invention.

FIG. 8 is a block diagram of main parts of a third embodiment of the invention.

FIG. 9 is a block diagram showing another embodiment of the arithmetic unit of the invention.

FIG. 10 is a schematic front view of a conventional combination weigher including an article feeding device.

[Explanation of symbols]

20 Supply device 21　Dispersion supply device 30 Crosshead feeder 31 Supply chute 32 Mobile device 38 Linear axis 40 Load cell 47 Force receiving part 51 Distributed feeder 52 Straight feeder 59 Load sensor 61　Eccentricity deviation amount calculator 62, 79 Arithmetic unit 74 Gutter 77 Display section

Claims (5)

[Claims] 1. Feeding the article by a feeding device in a predetermined direction across the distribution feeder to supply it onto the distribution feeder,
In a dispersion feeding device configured to feed the article to the periphery of a dispersion feeder and further to the outside of the dispersion feeder using a plurality of linear feeders, a straight line parallel to the predetermined direction that crosses above the dispersion feeder. A predetermined position on the axis is set as a target point, and the direction of eccentricity, or the direction of eccentricity and the degree of eccentricity of the center position of the load by the article on the distributed feeder and the linear feeder or on the distributed feeder is determined on the linear axis. and, based on the component in the linear axis direction, move the supply position of the article to the dispersion feeder of the feeding device along the linear axis direction in a direction opposite to the direction of the eccentricity. A method for controlling a distributed feeding device. 2. Feeding the article by a feeding device in a predetermined direction across the distribution feeder, and supplying the article onto the distribution feeder;
In a dispersion feeding device configured to feed the article to the periphery of a dispersion feeder and further to the outside of the dispersion feeder using a plurality of linear feeders, a straight line parallel to the predetermined direction that crosses above the dispersion feeder. A predetermined position on the axis is set as a target point, and the direction of eccentricity, or the direction of eccentricity and the degree of eccentricity of the center position of the load by the article on the distributed feeder and the linear feeder or on the distributed feeder is determined on the linear axis. a load detecting device provided so as to be obtained as a component in the direction; and at least an article outlet portion of the feeding device supported so as to be movable in the linear axis direction with respect to the dispersion feeder, the article outlet portion being movable in the linear axis direction. A moving device provided to move the article along the axis and a component in the linear axis direction obtained by the load detecting device operate the moving device to move the article exit portion in a direction opposite to the direction of the eccentricity. What is claimed is: 1. A control device for a distributed supply device, comprising: a drive control section that drives the device so as to perform the following operations. 3. A control device for a distributed feeding device according to claim 2, wherein the moving device and the drive control unit are not provided, and at least the article exit portion of the feeding device is moved in the straight line with respect to the distributed feeder. A manual position changing device that is movably supported in the axial direction and is provided to fix the article exit portion at a desired position on the linear axis, and a component in the linear axis direction obtained by the load detection device. A control device for a distributed supply device, comprising: a display device for displaying information. 4. Feeding the article by a feeding device in a predetermined direction across the distribution feeder, and supplying the article onto the distribution feeder;
In a dispersion feeding device configured to feed the article to the periphery of a dispersion feeder and further to the outside of the dispersion feeder using a plurality of linear feeders, the proximal end is fixed and the article is dispersed from the proximal end. It extends parallel to the predetermined direction across the feeder, and its tip part receives a load from the distributed feeder and the article on the linear feeder or the article on the distributed feeder (hereinafter simply referred to as "article on the distributed feeder"). An elastic strain body having a force receiving portion is provided, and four strain gauges are attached to the surface of the strain body passing through the center line in the extension direction of the strain body and perpendicular to a plane along the direction in which the load is received. A load sensor consisting of four strain gauges connected to a bridge circuit, and a predetermined position on a linear axis parallel to the predetermined direction that crosses the distributed feeder as a target point, based on the output signal of the bridge circuit. an arithmetic control unit that calculates the direction of eccentricity of the center position of the load caused by the articles on the distributed feeder with respect to the target point, or the direction of eccentricity and the degree of eccentricity as a component in the linear axis direction; and at least an article exit portion of the supply device. a moving device that supports the dispersion feeder so as to be movable in the linear axis direction and moves the article exit portion thereof along the linear axis direction; and the linear axis calculated by the arithmetic and control unit. a drive control unit that operates the moving device based on a direction component so that the article exit portion moves in a direction opposite to the direction of the eccentricity. Device. 5. A control device for a distributed feeding device according to claim 4, wherein the moving device and the drive control unit are not provided, and at least the article exit portion of the feeding device is moved in the straight line with respect to the distributed feeder. a manual position changing device that is movably supported in the axial direction and is provided to fix the article exit portion at a desired position on the linear axis; and a display of the component in the linear axis direction calculated by the arithmetic and control unit. What is claimed is: 1. A control device for a distributed supply device, comprising: a display device for displaying a display device;