JP2016217720A - Combination balance - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress occurrence of a lump of a measuring object that easily becomes entangled, by sufficiently dispersing and transferring the measuring object.SOLUTION: The combination balance includes: a stepping motor 4 for rotating and driving a top cone 3 of a dispersion feeder 2; and a loosing member 19 that faces a rectilinear feeder 5 from above and is rotated and driven. Preferably, the loosing member 19 is connected to the top cone 3, and the top cone 3 and loosing member 19 are integrally rotated and driven.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a combination weigher that performs combination weighing so that an object to be weighed has a predetermined weight.

  In general, in a combination weigher, the objects to be weighed that have been conveyed by a supply conveyor are supplied to a dispersion feeder at the center of the apparatus, and are distributed and conveyed to a plurality of surrounding linear feeders by the dispersion feeder. After being oscillated and conveyed by the feeder toward each supply hopper, it is put into each corresponding weighing hopper from each supply hopper. In each weighing hopper, the weights of the objects to be weighed are respectively weighed, and a combination of weighing hoppers in which a combined weight obtained by combining the weighed weights is within a predetermined weight range is selected. The objects to be weighed from the plurality of selected weighing hoppers are discharged to the collecting chute, gathered to a predetermined weight, and put into a packaging machine installed below the combination weigher for packaging.

  In this combination weigher, when weighing objects to be entangled with each other, for example, palms, the objects to be weighed conveyed from the dispersion feeder may become entangled in the trough of the linear feeder and stay as a lump.

  If the objects to be weighed are fed into the weighing hopper without being fully dispersed, it will be difficult to establish a combination that falls within the specified weight range, the weighing speed will decrease, the combination accuracy will decrease, and the yield will be poor. Become.

  Therefore, for example, as shown in Patent Document 1, a stirrer made of a bar material is provided so as to be able to turn opposite to the top cone constituting the dispersion feeder, or, as shown in Patent Document 2, By providing a stirring member on the straight feeder installed around the dispersion feeder, the stirring action is given to the objects to be weighed on the dispersion feeder or the straight feeder, and an attempt is made to prevent the occurrence of stagnation due to entanglement. What has been proposed.

JP 2014-139552 A Japanese Utility Model Publication No. 7-38927

  However, in the configuration in which the dispersion feeder as described in Patent Documents 1 and 2 is vibrated and the object to be weighed is transferred to the outside, for example, in the case of a slender and flexible object to be weighed such as a palm, the top cone It is easy to be transported with the dispersion being insufficient. In addition, entanglement may progress while receiving vibration on the top cone. For this reason, the objects to be weighed supplied to the dispersion feeder are often transferred to the linear feeder in a tangled state, and the unraveling action by the stirring member may not be sufficiently exhibited.

  Although it is conceivable to vibrate the dispersion feeder with a large vibrator, the apparatus becomes larger and the cost becomes higher.

  The present invention has been made in view of the above points, and suppresses the occurrence of a mass of objects to be weighed by sufficiently dispersing and transferring objects to be tangled without increasing the size of the apparatus. For the purpose.

  In order to achieve the above object, the present invention is configured as follows.

(1) A combination weigher according to the present invention is a dispersion feeder that conveys an object to be weighed on a top cone to a peripheral portion, and is arranged radially around the dispersion feeder, and the object to be weighed from the top cone is A combination weigher that includes a plurality of rectilinear feeders that convey outward, and in which the objects to be weighed are supplied from a supply device to the top cone,
Drive means for driving the top cone to pivot, and a loosening member that pivots to face the linear feeder from above.

  According to the present invention, in the distributed feeder, even if the supplied object to be weighed easily absorbs vibration, it does not stay on the top cone for a long time and is generated as the top cone turns. It is sent out radially outwardly by centrifugal force, and is transferred to the linear feeder in a sufficiently dispersed state without the entanglement of the object to be weighed on the top cone.

  Moreover, since the to-be-measured object transferred to the rectilinear feeder receives the unraveling action of the unraveling member that turns to oppose the rectilinear feeder, it is suppressed from becoming tangled and growing into a large lump.

  (2) In a preferred embodiment of the present invention, the base portion of the loosening member is supported by the top cone in a cantilevered manner, and the top cone and the loosening member are integrally rotated.

  The loosening member may be joined to the top cone by welding or the like and supported in a cantilever manner, or may be detachably connected by a bolt or the like and supported in a cantilever manner.

  According to this embodiment, the top cone and the loosening member can be swiveled by a single drive means, which is effective for simplifying the drive mechanism and reducing costs.

  (3) In the embodiment of the above (2), the drive means is a drive motor, and based on a detection means for detecting an overload state of the drive motor and a detection output of the previous detection means, the supply device Control means for controlling the supply of the object to be weighed to the top cone.

  According to this embodiment, when a particularly strongly entangled mass or a large mass of an object to be weighed starts to be generated on the linear feeder, an overload acts on the drive motor that drives the loosening member to rotate by this mass. By detecting the state, it is possible to grasp that a strongly lumped lump or a large lump of the object to be weighed is being generated on the linear feeder.

  Since the control means controls the supply of the object to be weighed to the top cone by the supply device based on the detection output of the detecting means for detecting the overload state of the drive motor, the entanglement of the object to be weighed is performed as described above. When a strong mass or a large mass starts to be generated and an overload state of the drive motor is detected, it is possible to limit the supply of the object to be weighed to the top cone. This restricts the supply of the object to be weighed from the top cone to the linear feeder and suppresses the growth of the object to be weighed while reducing the mass of the object to be weighed by the conveying action of the linear feeder. it can.

  (4) In the embodiment of the above (3), the detection means may detect a step-out of the drive motor as the overload state.

  According to this embodiment, when the detection means detects the step-out of the drive motor, it is assumed that a strongly entangled mass or a large mass of an object to be weighed has started to be generated on the linear feeder. It is possible to control the supply of the object to be weighed to the top cone, for example, to limit the supply of the object to be weighed to the top cone.

  (5) In another embodiment of the present invention, the control means supplies the object to be weighed to the top cone by the supply device when the detection means detects an overload state of the drive motor. Or the supply speed of the object to be weighed is reduced.

  According to this embodiment, when the overload state of the drive motor is detected by the detection unit, the control unit determines that a strongly entangled mass or a large mass of an object to be weighed is being generated on the linear feeder. Stops the supply of the weighing object to the top cone or reduces the feeding speed of the weighing object, so that the weighing object is moved from the top cone onto the straight feeder where a large tangled mass or a large lump is generated. Since the supply is not performed or the supply amount is reduced, it is possible to reduce the mass of the object to be weighed by the conveying action of the linear feeder while preventing the object mass from growing.

  (6) In the embodiment of the above (5), after the control means stops the supply of the object to be weighed or reduces the supply speed of the object to be weighed, the detection means When the overload state of the drive motor is no longer detected, the supply of the object to be weighed that has been stopped is restarted, or the supply speed of the object to be weighed that has been decelerated is changed to the original supply before deceleration. Return to speed.

  According to this embodiment, a strongly entangled mass or a large mass of the object to be weighed starts to be generated on the linear feeder, and the overload state of the drive motor is detected by the detecting means, and the top cone is weighed by the supply device. After stopping the supply of the object or decelerating the supply speed of the object to be weighed, if the mass of the object to be weighed that has caused an overload is gradually released from the loosening member due to the conveying action of the linear feeder When the overload state of the drive motor is eliminated, the loosening member turns again at the original speed, and the supply of the object to be weighed to the top cone by the supply device can be returned to the original supply state.

  (7) In the embodiment of (6), when the supply of the object to be weighed is resumed, the control means resumes the supply of the object to be weighed at a lower supply speed than the original supply speed before the stop. Then, the original supply speed may be gradually returned to the original supply speed, or when the original supply speed before the deceleration is restored, the original supply speed may be gradually restored.

  According to this embodiment, when the overload state of the drive motor is eliminated and the supply of the object to be weighed to the top cone by the supply device is returned to the original supply state, it is gradually returned to the original supply speed. As the supply amount of the object to be weighed increases, it is possible to avoid the occurrence of a strongly entangled mass or a large mass of the object to be measured again on the linear feeder.

  (8) In another embodiment of the present invention, the linear feeder includes a trough to which the object to be weighed is supplied from the top cone, and conveys the object to be weighed by vibrating the trough. The trough has a partition wall that becomes a boundary with an adjacent trough, and the partition wall is bent along the transport direction of the object to be weighed and is swiveled to face the trough. The loosening member is bent and formed corresponding to the partition wall.

  According to this embodiment, the mass of the object to be weighed that is dragged and moved by the loosening member that is pivotally driven opposite to the trough is caught by the partition wall that becomes the boundary with the adjacent trough and is subjected to resistance, and is loosened. The partition wall is bent along the conveying direction, while the loosening member is also bent corresponding to the partition wall, so that the loosening member is swung in parallel with the partition wall of the trough. It can be loosened while leveling the sample.

  According to the combination weigher of the present invention, an object to be entangled is sufficiently dispersed and transported without increasing the size of the apparatus, and the occurrence of stagnation due to entanglement is suppressed, and even when entanglement occurs, it is accurately detected. It can be loosened and combination weighing can be performed with high accuracy.

FIG. 1 is a schematic diagram showing a schematic configuration of a combination weigher according to an embodiment of the present invention. FIG. 2 is a front view of the upper portion of the combination weigher of FIG. FIG. 3 is a top perspective view of the combination weigher of FIG. 4 is a top plan view of the combination weigher of FIG. 5 is a cross-sectional view taken along the line AA in FIG. FIG. 6 is a block diagram showing a schematic configuration of a control system of the combination weigher of FIG. FIG. 7 is a time chart showing the control of the supply conveyor.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a schematic view of a combination weigher according to an embodiment of the present invention, FIG. 2 is a front view of the upper part of the combination weigher, and FIG. 3 is a perspective view of the upper part of the combination weigher. 4 is a top plan view of the combination weigher, and FIG. 5 is a cross-sectional view taken along the line AA in FIG.

  As shown in FIG. 1, the combination weigher of this embodiment has a dispersion that disperses and transports the objects to be weighed dropped from a belt conveyor type supply conveyor 1 as a supply device toward the outer periphery, as shown in FIG. 1. A feeder 2 is provided. The dispersion feeder 2 includes a conical top cone 3 that can turn around a central axis p, and a stepping motor 4 as drive means for driving the top cone 3 to turn. In the dispersion feeder 2, the objects to be weighed on the top cone 3 are dispersed and transferred toward the outer peripheral edge by the centrifugal force accompanying the turning.

  Around the dispersion feeder 2, there are a plurality of (10 in this example) rectilinear feeders 5 that linearly convey the objects to be weighed and transferred to the outer peripheral edge of the top cone 3 to the outside. They are arranged radially. The rectilinear feeder 5 includes a trough (feeder pan) 6 on which an object to be weighed is placed, and an excitation mechanism 7 that drives the trough 6 to vibrate.

  As shown in FIGS. 2 to 4, the trough 6 alone has a planar shape that is formed into a bowl shape that spreads outward, and one of the left and right side plates is bent into a chevron shape, and as shown in FIG. A partition wall 6 a that covers the other side plate of the adjacent trough 6 and partitions the adjacent trough 6 is formed. Further, the bottom surface of the trough 6 is inclined so that the front half is inclined outwardly downward along the conveyance direction of the object to be weighed, and the latter half is inclined gently downward from the front half. In addition, the front half of the partition wall 6a that becomes the boundary between the adjacent troughs 6 is set to be low in parallel with the front half of the bottom surface, and a shallow groove-shaped conveyance passage having a certain depth is formed in the front half of the trough, The rear half of the partition wall portion 6a is slightly inclined upward, and a groove-shaped transport passage that is deeper toward the outer end is formed in the rear half of the trough.

  A supply hopper 8 is disposed below the outer edge of each linear feeder 5 and a weighing hopper 9 is disposed below each supply hopper 8 as shown in FIG.

  Under the supply hopper 8 and the weighing hopper 9, a closing gate 8a and a discharging gate 9a that can be opened and closed are respectively provided. The supply hopper 8 receives and temporarily holds an object to be weighed that is transported by the linear feeder 5 and dropped and discharged from the transport end, and when the weighing hopper 9 disposed below becomes empty, the feeding gate 8a is opened. Then, the object to be weighed is dropped and discharged into the weighing hopper 9. Each weighing hopper 9 is connected to a weight sensor 10 such as a load cell for measuring the weight of an object to be weighed in the hopper, and weighing data from each weight sensor 10 is output to the control device 11.

  The objects to be weighed discharged from the weighing hoppers 9 are guided down to the center of the apparatus by the collecting chutes 12 arranged below the weighing hoppers 9, gathered by the collecting funnels 13, and then arranged below the collecting funnels 13. It is thrown into the hopper 14 and temporarily held.

  By combination calculation by the control device 11, an appropriate amount combination in which the combination weight, which is the sum of the weight values of the objects to be weighed, is equal to the target combination weight or the closest weight within the allowable range from among the plurality of weighing hoppers 9 Is obtained, and the objects to be weighed are discharged from the weighing hopper 9 corresponding to the combination to the collecting hopper 14 and temporarily held. When a discharge request signal is input from the packaging machine, the discharging gate 14a of the collecting hopper 13 The opening is controlled and discharged to a packaging machine (not shown) below.

  Further, the weight of the object to be weighed supplied from the supply conveyor 1 onto the top cone 3 of the dispersion feeder 2 is measured by a top cone weight sensor 18 such as a load cell, and the measured value is given to the control device 11. As will be described later, the control device 11 performs on / off control of the supply conveyor 1 so that the objects to be weighed on the top cone 3 are kept between a preset upper limit value and a lower limit value.

  In the control device 11, operation control of the supply conveyor 1, combination calculation, and overall operation control of the combination weigher are performed.

  In this embodiment, an origin sensor 15 that detects the turning origin of the top cone 3 is disposed below the stepping motor 4 that drives the top cone 3 to turn. As shown in FIG. 2, this origin sensor 15 is a photo that optically detects the passage of a rotating disk 16 provided at the lower end of the output shaft of the stepping motor 4 and a slit formed at one location on the outer periphery of the rotating disk 16. It consists of an interrupter 17. The detection output of the origin sensor 15 is given to the control device 11, and the control device 11 appropriately performs the turning of the top cone 3 within the set speed range based on the slit passage period detected by the origin sensor 15. It is detected whether or not it is in a step-out state where it has been decelerated or stopped from the set speed range. That is, the origin sensor 15 and the control device 11 constitute detection means for detecting an overload state of the stepping motor 14 as a step-out state.

  Further, near the outer peripheral portion of the upper surface of the top cone 3, a plurality of (three in this example) loosening members 19 at equal pitches in the circumferential direction face the troughs 6 constituting the linear feeder 5 with a predetermined interval. It is arranged radially so that it is detachably bolted. The loosening member 19 may be joined near the outer periphery of the top cone 3 by welding or the like, and the single loosening member 19 may be provided.

  The loosening member 19 of this embodiment is made of a round bar, and goes outward so as to face the front part of the first half of the gently descending slope in the latter half of the trough 6 constituting the linear feeder 5. It is arranged in a cantilevered manner. The trough 6 is formed by bending the upper surface of the partition wall 6a that forms the boundary between adjacent troughs 6 along the conveyance direction of the object to be weighed. That is, as shown in FIG. 2, the upper surface of the partition wall portion 6a is bent so that the front portion, which is the upper side in the conveyance direction of the object to be weighed, is inclined outwardly downward and slightly inclined upward in the middle of the conveyance direction. Is formed. The loosening member 19 is also bent and formed so as to be parallel to the upper surface of the bent partition wall portion 6a.

  FIG. 5 is a block diagram showing a schematic configuration of the control system of the combination weigher in this embodiment, and parts corresponding to those in FIG. 1 are denoted by the same reference numerals.

  As shown in FIG. 5, the control device 11 includes a CPU unit 21 as a calculation control unit, a memory unit 22, an A / D conversion circuit unit 23, a supply conveyor drive circuit unit 24, a motor drive circuit unit 25, and a vibration control circuit. A unit 26, a gate drive circuit unit 27, an I / O circuit unit 28, and the like are provided, and an operation setting display unit 29 is connected thereto.

  The CPU unit 21 as a calculation control unit controls each unit and performs combination calculation, zero correction of the weighing hopper 9, and the like.

  The memory unit 22 stores an operation program for the combination weigher, operation parameters to be set, and the like, and serves as a work area for operations on the CPU unit 21.

  The A / D conversion circuit unit 23 receives analog signals from the top cone weight sensor 18 that detects the weight of the object to be weighed on the top cone 3 and the weight sensor 10 that detects the weight of the object to be weighed in each weighing hopper 9. It converts it into a digital signal and outputs it to the CPU unit 21.

  Based on a control signal from the CPU unit 21, the gate drive circuit unit 27 controls opening and closing of the input gate 8 a of the supply hopper 8, the discharge gate 9 a of the weighing hopper 9, and the discharge gate 14 a of the collective hopper 14. .

  The vibration control circuit unit 26 controls the vibration mechanism 7 of each linear feeder 5 based on a control signal from the CPU unit 21.

  The supply conveyor drive circuit unit 24 controls the drive of the supply conveyor 1 based on a control signal from the CPU unit 21.

  The motor drive circuit unit 25 controls the driving of the stepping motor 4 that drives the top cone 3 to turn based on a control signal from the CPU unit 21.

  The detection output of the origin sensor 15 is input to the CPU unit 21 via the I / O circuit unit 28, and the CPU unit 21 detects a step-out state due to an overload of the stepping motor 4.

  The control device 11 controls the operation of the entire combination weigher by the CPU unit 21 executing the operation program stored in the memory unit 22.

  In the combination weigher, it is necessary to set a large number of operation parameters in order to perform the above-described operation. The operator sets the operation parameters using the operation setting display unit 29, and the set operation parameter values are stored in the CPU unit 21. It is sent and stored in the memory unit 22. The operation parameters include a target combination weight which is a target value in the combination calculation, an allowable range, the amplitude and driving time of each feeder 2 and 5 (one vibration duration time), an object to be weighed on the top cone 3 There are an upper limit value and a lower limit value that determine the weight range.

  In this embodiment, when the objects to be weighed are elongated and supple, such as sprout and cut vegetables, the objects to be weighed transferred from the dispersion feeder 2 to the linear feeder 5 may be entangled with each other and stay. However, the loosening member 19 that swirls together with the top cone 3 swivels on the rectilinear feeder 5, so that the tangled object to be weighed is loosened and smoothly transferred toward the supply hopper 8.

  Here, most of the base end side of the loosening member 19 pivots in parallel with the upper surface of the partition wall portion at the front half of the trough 6 in the linear feeder 5, that is, at a lower portion of the partition wall portion 6a. When a large lump begins to be generated, the lump of the object to be weighed is dragged by the loosening member 19 and moved in the same direction, and the lower part of the lump of the object to be weighed is further caught on the partition wall 6a of the trough 6. When the loosening member 19 is moved, the lump is loosened, a part of the object to be weighed is left in the trough 6 on the near side, and the object to be weighed by the loosening member 19 is brought into the trough 6 of the lower swivel.

  In addition, an object to be weighed entangled across the partition wall 6a of the trough 6 may stay in a bent portion of the partition wall 6a and grow into a large lump. Therefore, the loosening action can be sufficiently exerted on the lump remaining in the bent part of the partition wall portion 6a, and the smooth vibration transfer in the linear feeder 5 is promoted.

  Further, the stronger the entanglement of the object to be weighed and the larger the lump, the greater the load resistance against the turning operation of the loosening member 19, and the stepping motor 4 is greatly decelerated or stopped due to overload, and at a predetermined rotational speed. Out of the normal turning operation.

  In such a case, the supply conveyor 1 is controlled as follows, and the recovery from the overload state of the stepping motor 4 is achieved.

  FIG. 7 is a time chart showing the control of the supply conveyor 1 based on the weight of the object to be weighed on the top cone 3 detected by the top cone weight sensor 18 and the step-out detection due to the overload of the stepping motor 4. (A) shows the weight of the object to be weighed on the top cone 3, (b) shows the step-out detection, and (c) shows the conveyance speed of the supply conveyor 1, that is, the object to be measured by the supply conveyor 1. The feeding rate of the weighing object is shown respectively.

  As shown in FIG. 7A, the supply conveyor 1 is stopped when the detected weight of the object to be weighed supplied to the top cone 3 exceeds the upper limit value, and the supply conveyor 1 when the detected weight becomes the lower limit value or less. The feed conveyor 1 is turned on / off in response to a change in the weight of the object to be weighed supplied to the top cone 3 so that the weight of the object to be weighed within the set range is set on the top cone 3. Supplied.

  Further, when it is detected that the stepping motor 4 has stepped out due to the load acting on the loosening member 19, the supply conveyor 1 is immediately stopped, and the supply of the objects to be weighed to the dispersion feeder 2 is cut off. In the linear feeder 5 in which the supply of the subsequent objects to be weighed is cut off, the remaining objects to be weighed are continuously transferred, and the objects to be weighed that have been caught on the loosening member 19 are gradually sent backward. The loosening member 19 comes off from the tip.

  When all or part of the object to be weighed that has been caught by the loosening member 19 and caused a large turning load is removed, the load on the stepping motor 4 is reduced, and the top cone 3 and the loosening member 19 of the dispersion feeder 2 are restored to their original speed. Resume turning at.

  When the step-out of the stepping motor 4 is eliminated in this way, the supply conveyor 1 is activated and the supply of the objects to be weighed to the dispersion feeder 2 is resumed. In this case, as shown in FIG. 7 (c), the restart of the supply of the objects to be weighed by the supply conveyor 1 after the step-out has been resolved is gradually increased to the original supply speed step by step. The supply amount of the objects to be weighed from 1 to the dispersion feeder 2 is gradually increased. This prevents the objects to be weighed from being supplied to the linear feeder 5 at once by restarting the supply, thereby preventing the occurrence of the step-out caused by the entanglement again.

  As described above, according to this embodiment, the top cone 3 is swung and the object to be weighed is conveyed by centrifugal force. Without being stayed for a long time, it can be sent out radially outwards quickly and transferred to the straight feeder 5 in a sufficiently dispersed state without the tangled object to be weighed on the top cone 3 Can do.

  In addition, the object to be weighed transferred to the rectilinear feeder 5 is subjected to the unraveling action of the unraveling member 19 that turns to face the rectilinear feeder 5, so that the object to be weighed is prevented from growing into a large lump.

  Furthermore, when the object to be weighed becomes entangled and a large lump starts to be generated, the stepping motor 4 steps out due to overload, and when this is detected, the object to be weighed to the top cone 3 by the supply conveyor 1 is detected. Therefore, the supply of the objects to be weighed is excessive, and the growth of the lump can be prevented. When the lump of the object to be weighed is reduced by the conveying action of the linear feeder 5 and the step-out state of the stepping motor 4 is eliminated, the top cone 3 and the loosening member 19 resume turning, and the supply conveyor 1 The supply of the object to be weighed is resumed and the normal state is restored.

  In this way, the objects to be weighed can be sufficiently distributed from the linear feeder 5 to the supply hopper 8 and thus to the weighing hopper 9 to suppress the entanglement, and the combination weighing can be performed with high accuracy.

(Other embodiments)
The present invention can also be implemented in the following forms.

  (1) The form and number of the loosening members 19 can be arbitrarily set according to the size and properties of the object to be weighed. For example, the loosening member 19 is not limited to a round bar shape, but may be a square bar shape, a vertical plate shape, or any other shape, and a rod-shaped swivel arm connected and supported on the top cone 3 in a cantilevered manner on the vertical wall. It is also possible to adopt a form in which the action plate and the plurality of action bars are extended downward.

  (2) By adjusting the mounting height of the loosening member 19 and changing the distance between the loosening member 19 and the trough 6, a suitable loosening action according to the type of the object to be weighed can be exhibited. In the structure of the said embodiment, attachment height can be adjusted by connecting the base end part of the loosening member 19 to the top cone 3 via the spacer of arbitrary thickness. Alternatively, a plurality of types of loosening members 19 having different specifications may be prepared in advance, and may be selectively used according to the type of the object to be weighed.

  (3) The overload state may be detected based on the load current of the stepping motor 4. Also, it is possible to detect a step-out due to overload by detecting the motor rotation speed with a rotary encoder.

  (4) When an overload state of the stepping motor 4 is detected, the supply conveyor 1 is decelerated to a predetermined speed to reduce the supply amount of the objects to be measured to the dispersion feeder 2, and if the step-out is still not resolved The supply conveyor 1 may be further decelerated or stopped.

  (5) When the overload state of the stepping motor 4 is detected, the top cone 3 and the loosening member 19 are driven reversely for a predetermined time while the operation of the supply conveyor 1 is continued, and the overload state is eliminated by this reverse rotation. Then, it is possible to adopt a control form in which the driving in the normal direction is resumed and the supply conveyor 1 is stopped if the overload state is not eliminated even in the reverse rotation driving.

  (6) In the above embodiment, the loosening member 19 is connected to the top cone 3, and the top cone 3 and the loosening member 19 are driven to rotate integrally. However, the loosening member 19 is swung to the supply conveyor 1 side. The top cone 3 and the loosening member 19 can be individually swiveled at different speeds, and the overload state of the drive motor of the loosening member 19 can be detected. In this case, based on the detection of the overload state of the driving motor of the loosening member 19, the supply conveyor 1 is controlled, the top cone 3 is turned, and the loosening part material 19 is turned. It is also possible to perform load avoidance control.

  (7) In the above embodiment, the weight of the object to be weighed on the top cone 3 is detected by the weight sensor 18 for the top cone, but instead of the weight sensor, for example, the object to be weighed on the top cone 3 is detected by a photoelectric sensor or the like. May be detected.

DESCRIPTION OF SYMBOLS 1 Supply conveyor 2 Dispersing feeder 3 Top cone 5 Straight feeder 8 Supply hopper 9 Weighing hopper 15 Origin sensor 19 Unraveling member

Claims (8)

A dispersion feeder that conveys the object to be weighed on the top cone to the peripheral portion, and a plurality of linear feeders that are radially arranged around the dispersion feeder and that convey the object to be weighed from the top cone outward. A combination weigher in which the object to be weighed is supplied from a supply device to the top cone,
Drive means for driving to rotate the top cone;
A loosening member that is pivotally driven to face the linear feeder from above;
Comprising
A combination weigher characterized by that. The base of the loosening member is supported in a cantilevered manner on the top cone, and the top cone and the loosening member are driven to rotate integrally.
The combination weigher according to claim 1. The drive means is a drive motor;
Detecting means for detecting an overload state of the drive motor;
Control means for controlling the supply of the object to be weighed to the top cone by the supply device based on the detection output of the pre-detection means;
Comprising
The combination weigher according to claim 2. The detecting means detects a step-out of the drive motor as the overload state;
The combination weigher according to claim 3. The control means stops the supply of the object to be weighed to the top cone by the supply device when the detection means detects an overload state of the drive motor, or supplies the object to be weighed Slow down the speed,
The combination weigher according to claim 3 or 4. The control means stops detecting the overload state of the drive motor by the detection means after the supply of the measurement object is stopped or after the supply speed of the measurement object is decelerated. The supply of the object to be weighed that has been stopped is resumed, or the supply speed of the object to be weighed that has been decelerated is returned to the original supply speed before the deceleration,
The combination weigher according to claim 5. The control means, when resuming the supply of the object to be weighed, restarts the supply of the object to be weighed at a supply speed slower than the original supply speed before the stop, and gradually returns to the original supply speed, or , When returning to the original supply speed before the deceleration, gradually return to the original supply speed,
The combination weigher according to claim 6. The linear feeder is provided with a trough to which the object to be weighed is supplied from the top cone, and conveys the object to be weighed by vibrating the trough, and the trough serves as a boundary with an adjacent trough. While having a partition part, this partition part is bent and formed along the conveyance direction of the said to-be-measured object,
The loosening member that is pivotally driven to face the trough is formed to bend corresponding to the partition.
The combination weigher according to any one of claims 1 to 7.

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