JP2015004605A - Combination weigher - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a combination weigher in which a dispersion section effectively disperses an adhesive article without damaging the article.SOLUTION: A combination weigher 100 comprises a dispersion section 11, a drive section 12, a drive control section 81a, plural conveyance sections 20, plural weighing sections 40, and a computation section 81b. The dispersion section disperses articles in the outer peripheral direction. The drive section intermittently drives and rotates the dispersion section. The drive control section controls the drive section. The plural conveyance sections convey the articles dispersed and supplied from the dispersion section. The plural weighing sections are provided so as to correspond to the conveyance sections, and measure the weight of the articles conveyed by the plural conveyance sections. The computation section selects, from the plural weighing sections, a weighing section having the articles with a target weight or a target number on the basis of the articles' weight measured by the plural weighing sections. The combination weigher discharges the articles in the weighing section selected by the computation section. The drive control section moves the articles in the outer peripheral direction of the dispersion section at the start of rotation for driving the dispersion section from a stopping state.

Description

  The present invention relates to a combination weighing device.

  2. Description of the Related Art Conventionally, there is known a combination weighing device that measures an article by a weighing unit and selects a combination of articles having a predetermined weight. For example, as shown in Patent Document 1 (Japanese Patent Laid-Open No. 59-97913), the combination weighing device includes a dispersion unit, a conveyance unit, and a weighing unit. A dispersion | distribution part disperse | distributes the articles | goods supplied from a high-order apparatus to the direction (outer periphery direction) which goes to an outer periphery. The conveyance unit conveys the articles distributed and supplied from the dispersion unit toward the weighing unit. The weighing unit receives and weighs the article conveyed by the conveying unit.

  By the way, the combination weighing device described in the above-mentioned document 1 intermittently rotates the dispersion unit, and supplies and distributes articles after the rotation speed of the dispersion unit becomes constant. However, when the article handled by the combination weighing device is a sticky article (for example, an article coated with sugar such as sweet natto, dried fruit, gummy, etc.), the article supplied from the host device is the surface of the dispersion unit. May adhere to. Once the article adheres to the dispersing portion, it becomes difficult to disperse and supply the article after the rotational speed becomes constant. As a result, the amount of articles conveyed to the weighing unit is insufficient, and a combination of articles having a predetermined weight cannot be selected. Here, conventionally, a configuration has been adopted in which a scraping member for scraping an article staying on the dispersion portion from the dispersion portion is provided. Therefore, it is possible to employ a method of scraping the sticky article or the like adhering to the dispersing portion with the scraping member. However, when the article attached to the surface of the dispersion portion is peeled off by the scraping member, the article may be damaged.

  Then, the subject of this invention is providing the combination weighing | measuring apparatus which makes it possible to disperse | distribute the articles | goods which have adhesiveness effectively by a dispersion | distribution part, without scratching.

  The combination weighing device according to the present invention includes a dispersion unit, a drive unit, a drive control unit, a plurality of transport units, a plurality of weighing units, and a calculation unit. A dispersion | distribution part disperse | distributes articles | goods to an outer peripheral direction (diameter direction outer side). The driving unit intermittently drives and rotates the dispersion unit. The drive control unit controls the drive unit. The plurality of conveyance units convey the articles distributed and supplied from the dispersion unit. The plurality of weighing units are provided corresponding to the conveying units, and weigh the articles conveyed by the plurality of conveying units. The calculation unit selects a weighing unit that is close to the target weight or the target number among the plurality of weighing units based on the weights of the articles weighed by the plurality of weighing units. The combination weighing device discharges the articles in the weighing unit selected by the calculation unit. Further, the drive control unit is characterized in that the article is moved in the outer peripheral direction of the dispersion unit at the start of rotation for driving the dispersion unit from a stationary state.

  The combination weighing device according to the present invention moves the article in the outer circumferential direction of the dispersing unit by driving the dispersing unit in a stationary state. That is, the movement of the article from the dispersing unit toward the plurality of conveying units is started by the centrifugal force at the start of rotation of the dispersing unit. Thereby, it is possible to effectively disperse the article without damaging the article. Further, even when the article is attached to the surface of the dispersion part, the article can be peeled off from the surface of the dispersion part by centrifugal force, and stable supply can be realized.

  Moreover, it is preferable that the start of rotation of the dispersion unit by the drive unit is during acceleration of the dispersion unit. The dispersion unit is accelerated at the start of rotation. The dispersing unit moves the article in the outer circumferential direction during acceleration. Thereby, the article that has been peeled off from the surface of the dispersing portion during acceleration and moved in the outer peripheral direction can be further moved in the outer peripheral direction by the control after acceleration.

  Moreover, it is preferable that a dispersion | distribution part has an inclination part and a horizontal part. The inclined portion is located at the center of the dispersing portion and has an inclined surface. The horizontal portion is located around the inclined portion and has a horizontal surface or an upward inclined surface. The article is dispersed from the center of the dispersion part in the outer peripheral direction. That is, the articles dispersed in the outer peripheral direction of the dispersing portion are moved from the inclined portion to the horizontal portion. The horizontal portion has a horizontal surface or an upward inclined surface. Therefore, it is possible to keep the article on the horizontal portion. As a result, a small amount of articles can be supplied to the transport unit.

  Furthermore, it is preferable that the drive control unit weakens the adhesion force of the article that has adhered to the dispersion unit during deceleration that causes the dispersion unit to change from the rotating state to the stationary state. Thereby, the article which weakened the degree of adhesion to the surface of the dispersion part at the time of acceleration can be reliably peeled off from the surface of the dispersion part.

  The combination weighing device according to the present invention enables an article having adhesiveness to be effectively dispersed by the dispersing unit without being damaged.

1 is a schematic front view of a combination weighing device according to an embodiment of the present invention. It is a schematic plan view of a combination weighing device. It is a schematic sectional drawing of a dispersion | distribution table. It is a schematic plan view of a distribution table. It is a schematic plan view of a radiation feeder. It is a control block diagram of a combination weighing device. It is a figure for demonstrating predetermined | prescribed cycle time.

  Hereinafter, a combination weighing device 100 according to an embodiment of the present invention will be described with reference to the drawings.

(1) Overall Configuration First, FIG. 1 shows a schematic diagram of a combination weighing device 100 according to an embodiment of the present invention. The combination weighing device 100 is a device that measures the weight of articles respectively stored in a plurality of weighing hoppers (weighing units) 40 and performs a combination calculation based on the measured value. The combination weighing device 100 selects a combination of articles whose combination calculation results in a value within a predetermined allowable range, and discharges the articles from the weighing hopper 40 related to the combination of the articles.

  The combination weighing device 100 is disposed above a packaging device or the like (not shown). As shown in any of FIGS. 1, 2, and 6, the combination weighing device 100 mainly includes an article supply unit 90, a dispersion table 11, a plurality of radial feeders (conveying units) 20, and a plurality of pools. The hopper 30 includes a plurality of weighing hoppers (weighing units) 40, one collective discharge chute 110, and a control device 80.

  For example, as shown in FIG. 2, the combination weighing device 100 according to the present embodiment includes 14 radiation feeders 20, pool hoppers 30, and weighing hoppers 40. The plurality of radiation feeders 20, the plurality of pool hoppers 30, and the plurality of weighing hoppers 40 constitute a head HD as shown in FIG. The radiation feeder 20, the pool hopper 30, and the weighing hopper 40 belonging to the same head HD are associated with each other. As shown in FIG. 2, each head HD is arranged in an annular shape centering on the dispersion table 11 in a plan view.

  In the combination weighing device 100, when an article is supplied from the article supply unit 90 to the dispersion table 11, the article is then conveyed from the dispersion table 11 to the radiation feeder 20. The articles dispersed by the dispersion table 11 are supplied to a plurality of radiation feeders 20. The articles supplied to the plurality of radiation feeders 20 are then transported and stored in the pool hopper 30 belonging to the same header HD. Further, the articles stored in the pool hopper 30 are then transported and stored in the weighing hopper 40 belonging to the same header HD. Thereafter, the articles stored in the weighing hopper 40 are collected by the collective discharge chute 110 and supplied to a packaging device disposed downstream.

  The article handled by the combination weighing device 100 according to the present embodiment is an adhesive article. Here, the adhesive article refers to an article that is easily adhered to the surface of the dispersion table 11 because the sugar applied to the article or the sugar contained in the article itself is dissolved. Specifically, in the present embodiment, an article refers to a confectionery / fruit (eg, sweet natto, dried fruit, and gummy) that is covered with sugar, a sugared food, and the like. Hereinafter, an example of combining and weighing sweet natto as an adhesive article will be described.

  In the combination weighing device 100, a small amount of small articles are combined to generate a collection of articles (combination of articles) having a desired total weight or a desired total number. For example, the sizes (width, length, and thickness) of articles (Amanatto) handled by the combination weighing device 100 according to the present embodiment are about 20 mm, about 30 mm, and about 10 mm, respectively. The total number of articles included in the aggregate of articles is 2 to 4. Therefore, the combination weighing device 100 drives the configuration arranged on the upstream side of the weighing hopper 40 so that one or two articles are supplied to each weighing hopper 40.

(2) Detailed Configuration (2-1) Article Supply Unit The article supply unit 90 is a unit that supplies articles to the dispersion table 11. As shown in FIG. 1, the article supply unit 90 is disposed above the distribution table 11. The article supply unit 90 is driven by the article supply unit driving unit 90a (see FIG. 6). The article supply unit 90 changes the operation / stop state and the quantity of articles to be supplied (supply quantity) based on a control command sent from the control device 80 described later.

(2-2) Dispersion table The dispersion table 11 disperses articles. The distribution table 11 is provided at a position for receiving an article supplied by the article supply unit 90 described above. Specifically, the dispersion table 11 disperses the article supplied from the article supply unit 90 in the direction toward the outer periphery (outer peripheral direction), and moves the article to the radiation feeder 20. More specifically, the dispersion table 11 disperses the article supplied from the article supply unit 90 using the centrifugal force due to rotation, moves it radially outward, and sends the article to each radiation feeder 20. The distribution table 11 is driven by a distribution table drive motor (drive unit) 12 (see FIG. 6).

  The distribution table 11 is a circular table that receives articles supplied from the article supply unit 90 (see FIGS. 2 and 4). Moreover, the dispersion | distribution table 11 has a cone-shaped part and a horizontal part by side view (refer FIG. 3).

  As shown in FIGS. 3 and 4, the conical portion is constituted by a first inclined portion 11 a and a second inclined portion 11 b. The 1st inclination part 11a and the 2nd inclination part 11b are located in the center of the dispersion | distribution table 11, as shown in FIG. Specifically, the 1st inclination part 11a is located in the center of the dispersion | distribution table 11, and the 2nd inclination part 11b is located in the outer periphery of the 1st inclination part 11a. The first inclined part 11a and the second inclined part 11b have different inclinations with respect to the horizontal direction. Specifically, the first inclined portion 11a is greatly inclined with respect to the horizontal direction as compared with the second inclined portion 11b.

  The horizontal part is constituted by a horizontal part 11c. The horizontal portion 11c constitutes the outer edge of the dispersion table 11 as shown in FIGS. In other words, the horizontal part 11c is located on the outer periphery of the second inclined part 11b. The horizontal portion 11c has a surface (horizontal plane) extending in the horizontal direction.

  The size of the distribution table 11 used in this embodiment is much smaller than the size of the distribution table used in a large combination weighing device. Specifically, the diameter L1 of the dispersion table 11 used in this embodiment is about 200 mm (see FIGS. 3 and 4). Moreover, the diameter L2 of the 1st inclination part 11a and the 2nd inclination part 11b is about 140 mm (refer FIG. 3 and FIG. 4). Specifically, the diameter L21 from the center of the dispersion table 11 to the outer edge of the first inclined portion 11a is about 20 mm. The diameter L22 from the outer edge of the first inclined part 11a to the outer edge of the second inclined part 11b is about 10 mm. Furthermore, the diameter L3 from the outer edge of the second inclined portion 11b to the outer edge of the horizontal portion 11c is about 30 mm. That is, the width dimension L3 of the horizontal part 11c in the dispersion table 11 is not large with respect to the dimension of the long part of the article. In other words, the width dimension L3 of the horizontal portion 11c in the dispersion table 11 is approximately the same as the dimension of the long portion of the article.

  The article supplied from the article supply unit 90 falls toward the first inclined part 11a and / or the second inclined part 11b of the dispersion table 11. The dispersion table 11 is driven to rotate intermittently by driving a dispersion table drive motor 12 described later. The article dropped on the first inclined portion 11a and the second inclined portion 11b is driven by the rotation of the dispersion table 11 and uses the surfaces (inclined surfaces) of the first inclined portion 11a and the second inclined portion 11b to obtain the horizontal portion 11c. Roll towards That is, the article that has fallen on the first inclined portion 11a and the second inclined portion 11b falls along the inclined surfaces of the first inclined portion 11a and the second inclined portion 11b, and reaches the horizontal portion 11c. Thereafter, the dispersion table 11 is further rotationally driven, whereby the article on the horizontal portion 11 c is moved to the radiation feeder 20.

  The distribution table drive motor 12 drives the distribution table 11. The dispersion table drive motor 12 rotates the dispersion table 11 by driving it intermittently. When the dispersion table drive motor 12 drives the dispersion table 11, the articles supplied to the dispersion table 11 are conveyed while being dispersed in the outer peripheral direction. In other words, the dispersion table drive motor 12 drives the dispersion table 11 to move the article placed on the dispersion table 11 while dispersing the article toward the radially outer side.

  The distribution table drive motor 12 is controlled to drive the distribution table 11 based on a control command sent from the control device 80 described later. Specifically, the distribution table drive motor 12 drives the distribution table 11 at a predetermined rotational speed for a predetermined time based on the content of the control command generated by the control device 80. The amount of articles distributed and supplied from the dispersion table 11 to the radiation feeder 20 varies according to the rotational speed and time for which the dispersion table drive motor 12 drives the dispersion table 11. Further, the distribution table drive motor 12 drives the distribution table 11 based on a predetermined cycle time CT. The predetermined cycle time CT includes an acceleration period t1, a constant speed period t2, and a deceleration period t3. Specific control contents of the distribution table 11 will be described in detail later.

(2-3) Radiation Feeder The radiation feeder 20 sends the articles distributed and supplied by the dispersion table 11 to the pool hopper 30. In other words, the radiation feeder 20 receives the articles conveyed by the dispersion table 11 and conveys the articles to the pool hopper 30 arranged further downstream.

  As shown in FIG. 2, the plurality of radiation feeders 20 are arranged to extend radially around the dispersion table 11. In other words, the plurality of radiation feeders 20 are arranged on the outer edge side of the dispersion table 11 so as to surround the dispersion table 11. Each radiation feeder 20 is driven by the radiation feeder drive coil 22 to vibrate (see FIG. 6). The article on the radiation feeder 20 is conveyed toward the outer edge by the vibration of the radiation feeder 20. That is, each radiation feeder 20 conveys the article in a direction away from the dispersion table 11. The articles conveyed by each radiation feeder 20 are supplied to a pool hopper 30 disposed below the outer edge side of each radiation feeder 20.

  The size of the radiating feeder 20 used in this embodiment is also much smaller than the size of the radiating feeder used in a large combination weighing device. Specifically, the diameter L4 of the radiation feeder 20 used in this embodiment is about 250 mm (see FIG. 5).

  Each radiation feeder 20 is independently driven based on a control command sent from a control device 80 to be described later. In other words, the radiation feeder drive coil 22 controls each radiation feeder 20 independently based on the control command. In addition, the amount of articles conveyed from each radiation feeder 20 to the pool hopper 30 is also controlled based on a control command sent from the control device 80. Specifically, the radiation feeder drive coil 22 changes the intensity (vibration intensity) and the vibration time for vibrating the radiation feeder 20 based on the control command.

(2-4) Pool hopper The pool hopper 30 temporarily stores the articles supplied from the radiation feeder 20, and then sends the stored articles to a weighing hopper 40 described later. The pool hopper 30 is disposed on the outer edge side of the radiation feeder 20. Further, the pool hopper 30 is disposed below the radiation feeder 20 so as to receive articles falling from the radiation feeder 20. Specifically, the pool hopper 30 belonging to each head HD is disposed below the outer edge side of the radiation feeder 20 belonging to the same head HD.

  The pool hopper 30 has openings at the upper and lower ends. The opening on the upper end side accepts an article falling from the radiation feeder 20. An openable / closable gate 31 is attached to the opening on the lower end side. The gate 31 is driven by a pool hopper drive motor 32 (see FIG. 6). When the gate 31 is opened, the articles stored in the pool hopper 30 fall into the weighing hopper 40. That is, the article is sent from the opening on the lower end side toward the weighing hopper 40. The pool hopper drive motor 32 is driven by a control command sent from the control device 80. In addition, the control apparatus 80 controls the gate 31 attached to each pool hopper 30 separately. That is, each gate 31 performs an open / close operation independently.

(2-5) Weighing hopper The weighing hopper 40 weighs the articles supplied by the pool hopper 30, and then discharges the weighed articles to the collective discharge chute 110. The weighing hopper 40 is disposed directly below the pool hopper 30 so as to receive articles dropped from the pool hopper 30. Specifically, the weighing hopper 40 belonging to each head HD is disposed directly below the pool hopper 30 belonging to the same head HD.

  The weighing hopper 40 also has openings at the upper and lower ends. The opening on the upper end side is an opening for receiving articles falling from the pool hopper 30. An openable / closable gate 41 is attached to the opening on the lower end side. The gate 41 is driven by a weighing hopper drive motor 43 (see FIG. 6). When the gate 41 is opened, the articles stored in the weighing hopper 40 fall onto the collective discharge chute 110. That is, the article is sent from the opening on the lower end side toward the collective discharge chute 110. The weighing hopper drive motor 43 is driven by a control command sent from the control device 80. The control device 80 individually controls the gates 41 attached to the weighing hoppers 40. That is, each gate 41 performs an opening / closing operation independently.

  Each weighing hopper 40 has a load cell 42. Articles held by the weighing hopper 40 are weighed by the load cell 42. The weighing result (weight data) of the article by the load cell 42 is output as a weighing signal. The output measurement signal is sent to a control device 80 (described later) via an amplifier (not shown) as needed.

(2-6) Collective Discharge Chute The collective discharge chute 110 collects articles supplied from the weighing hopper 40 and discharges them outside the combination weighing device 100. The discharged articles are supplied to a packaging device (not shown) disposed below the collective discharge chute 110.

(2-7) Control Device The control device 80 is a device for controlling the combination weighing device 100. The control device 80 is connected to the article supply unit drive unit 90a, the dispersion table drive motor 12, the radiation feeder drive coil 22, the pool hopper drive motor 32, the weighing hopper drive motor 43, the load cell 42, and the like.

  The control device 80 includes a CPU 80a, ROM 80b, RAM 80c, HDD 80d, and the like. The control device 80 stores various programs and data for controlling the combination weighing device 100. The control device 80 functions as a drive control unit 81a, a calculation unit 81b, and the like by executing various programs. The drive control unit 81a issues control commands to the article supply unit drive unit 90a, the dispersion table drive motor 12, the radiation feeder drive coil 22, the pool hopper drive motor 32, the weighing hopper drive motor 43, and the like connected to the control device 80. The article supply unit drive unit 90a, the dispersion table drive motor 12, the radiation feeder drive coil 22, the pool hopper drive motor 32, and the weighing hopper drive motor 43 are driven. In addition, based on the weight data obtained by the load cell 42, the calculation unit 81b selects the weighing hopper 40 that can generate a target weight or a combination of articles close to the target number (a collection of articles).

  Various programs and data stored in the control device 80 include data for driving the distribution table 11. The data for driving the distribution table 11 is information for driving the distribution table 11 with a predetermined cycle time CT by the distribution table drive motor 12. Here, the predetermined cycle time CT specifically includes an acceleration period t1, a constant speed period t2, a deceleration period t3, and a stop period t4 (see FIG. 7).

  Hereinafter, the control of the dispersion table 11 in each period t1 to t4 and the movement of the article accompanying the control of the dispersion table 11 will be described. In the present embodiment, the predetermined cycle time CT is about 1090 msec.

(2-7-1) Dispersion Table Control and Article Movement in Each Period (i) Acceleration Period The acceleration period t1 is a predetermined period after the driving of the dispersion table 11 is started. The acceleration period t1 is a period in which the rotation speed of the dispersion table 11 is rapidly increased toward a predetermined rotation speed αrpm. In the present embodiment, the acceleration period t1 is about 15 msec, and the predetermined rotation speed αrpm is 75 rpm. That is, in this embodiment, the rotation speed of the dispersion table 11 is accelerated at 5 rpm / msec.

  In the acceleration period t1, the dispersion table 11 is driven at an acceleration at which an inertial force that causes the article attached to the surface on the dispersion table 11 to loosen the degree of adhesion to the surface is exerted by the rotation of the dispersion table 11.

  Specifically, the control device 80 moves the article in the outer peripheral direction of the dispersion table 11 by driving the dispersion table 11 from a stationary state. In other words, the control device 80 conveys the article toward the radially outer side of the dispersion table 11 when the dispersion table 11 starts to rotate.

  More specifically, the control device 80 determines that the article attached to the surface of the dispersion table 11 by the force (inertial force) acting on the article at the start of rotation (acceleration) of the dispersion table 11 The distribution table 11 is controlled so as to be peeled off. In other words, the control device 80 has a rotational speed (acceleration) that generates an inertial force that peels off an article attached to the surface of the dispersion table 11 from the surface of the dispersion table 11 when the dispersion table 11 starts to rotate. 11 is driven. In the present embodiment, as described above, the rotation speed of the dispersion table 11 during the acceleration period t1 is set to 5 rpm / msec. That is, the dispersion table 11 is accelerated at 5 rpm / msec. In addition, the rotational speed of the dispersion | distribution table 11 in the acceleration period t1 is not limited to 5 rpm / msec, What is necessary is just the rotational speed which produces the inertial force which peels off articles | goods from the surface of the dispersion | distribution table 11. The article attached to the surface of the dispersion table 11 loosens the degree of adhesion to the dispersion table 11 during the acceleration period t1. Some of the articles adhered to the surface of the dispersion table 11 are peeled off from the surface of the dispersion table 11 during the acceleration period t1 and start moving in the outer circumferential direction.

(Ii) Constant speed period The constant speed period t2 is a period during which the dispersion table 11 is continuously driven at a predetermined rotational speed αrpm. As described above, here, the predetermined rotation speed is 75 rpm. In the present embodiment, the constant speed period t2 is about 70 msec.

  The control device 80 drives the dispersion table 11 at a constant speed to move the article in the outer peripheral direction of the dispersion table 11.

  When the control device 80 continues to drive at a predetermined rotational speed αrpm during the constant speed period t2, the article loosened the degree of adhesion to the surface of the dispersion table 11 during the acceleration period t1, or the surface of the dispersion table 11 The article peeled from the sheet is dispersed in the outer peripheral direction of the dispersion table 11 in accordance with the centrifugal force generated by the rotation of the dispersion table 11. That is, the articles on the dispersion table 11 further move toward the radially outer side of the dispersion table 11 during the constant speed period t2.

(Iii) Deceleration period The deceleration period t3 is a predetermined period before the driving of the dispersion table 11 is stopped. The deceleration period t3 is a period during which the rotation speed of the dispersion table 11 is decreased toward 0 rpm. In the present embodiment, the deceleration period t3 is about 15 msec.

  The control device 80 decreases the rotation speed of the distribution table 11. As the rotational speed of the dispersion table 11 decreases, the moving speed of the articles also decreases. The article moves in the outer circumferential direction (outside in the radial direction) of the dispersion table 11 while reducing the moving speed.

(Iv) Stop period The stop period t4 is a period during which the driving of the distributed table 11 is stopped. In the present embodiment, the stop period t4 is about 940 msec.

  The control device 80 stops the rotation of the distribution table 11. As a result, the movement of the article on the distribution table 11 is also stopped.

(3) Features of combination weighing device (3-1)
The combination weighing device 100 according to the embodiment includes a dispersion table 11, a dispersion table drive motor (drive unit) 12, a drive control unit 81a, a plurality of radiation feeders (conveyance units) 20, and a plurality of weighing hoppers (weighing). Part) 40 and a calculation part 81b. The dispersion table 11 disperses the article in the direction toward the outer periphery (peripheral direction). The dispersion table drive motor 12 drives and rotates the dispersion table 11 intermittently. The drive control unit 81 a controls the distribution table drive motor 12. The plurality of radiation feeders 20 convey the articles distributed and supplied from the dispersion table 11. The plurality of weighing hoppers 40 are provided corresponding to the radiation feeders 20 and weigh the articles conveyed by the plurality of radiation feeders 20. Based on the weight of the articles weighed by the plurality of weighing hoppers 40, the calculation unit 81b selects the weighing hopper 40 that can generate a combination of articles close to the target weight or the target number among the plurality of weighing hoppers 40. The combination weighing device 100 discharges the articles in the weighing hopper 40 selected by the calculation unit 81b. Further, the drive control unit 81a is characterized in that the article is moved in the outer peripheral direction of the dispersion table 11 at the start of rotation for driving the dispersion table 11 from a stationary state.

  In the combination weighing device 100 according to the present invention, combination weighing of articles having adhesiveness is performed. As described above, the sticky article refers to an article that easily adheres to the surface of the dispersion table 11 when the sugar applied to the article or the sugar contained in the article itself is melted. Specifically, the sticky article refers to a confectionery / fruit (eg, sweet natto, dried fruit, and gummy) that is covered with sugar, a sugared food, and the like. Depending on the humidity and temperature of the space in which the combination weighing device 100 is placed, the sticky article melts around the article and adheres to the surface of the dispersion table 11. In other words, when the humidity and temperature of the space where the combination weighing device 100 is placed rises and sugar dissolves around the article, the surface of the dispersion table 11 does not move smoothly. In the conventional combination weighing device, the articles supplied to the dispersion table 11 are distributed and supplied from the dispersion table 11 toward the radiation feeder 20 while rotating at a constant speed at a predetermined rotation speed. However, if the article is a sticky article, once the article has adhered to the surface of the dispersion table 11, the rotation speed of the dispersion table 11 reaches a predetermined rotation speed, and even when driven at a constant speed for a certain time, The article is not peeled off from the surface of the dispersion table 11. That is, when the article adheres to the surface of the dispersion table 11, it becomes difficult to suitably perform the dispersion supply by the dispersion table 11. As a result, the amount of articles conveyed to the weighing hopper 40 is insufficient, and a combination of articles having a predetermined weight cannot be selected. Conventionally, a configuration in which a scraping member is provided to scrape articles staying on the dispersion table from the dispersion table has been employed. However, when the article attached to the surface of the dispersion table is peeled off by the scraping member, the article may be damaged.

  Therefore, in the combination weighing device 100 according to the above embodiment, the article is moved in the outer circumferential direction of the dispersion table 11 by driving the dispersion table 11 in a stationary state. Specifically, the rotational speed at the start of rotation of the dispersion table 11 is increased, and the article is moved radially outward of the dispersion table 11 when driven from a stationary state. That is, even if the article on the dispersion table 11 is attached to the surface of the dispersion table 11, it is pulled away from the surface of the dispersion table 11 due to the inertia that acts when the rotation of the dispersion table 11 starts. Thereby, the stable supply of the articles | goods with respect to the radiation feeder 20 is realizable. Further, the article can be pulled away from the surface of the dispersion table 11 without providing another member such as a scraping member. As a result, the articles can be distributed and supplied to the radiation feeder 20 without damaging the articles on the distribution table 11.

(3-2)
The combination weighing device 100 according to the above embodiment moves the article in the outer circumferential direction of the dispersion table 11 when the dispersion table 11 is started to rotate by the dispersion table drive motor 12, that is, when the dispersion table 11 is accelerated.

  The driving cycle of the distribution table 11 is based on the cycle time CT. As described above, the cycle time CT includes an acceleration period t1, a constant speed period t2, a deceleration period t3, and a stop period t4 (see FIG. 7). The combination weighing device 100 increases the rotational speed of the dispersion table 11 in a short period toward the predetermined rotational speed αrpm in the acceleration period t1, and increases the rotational speed of the dispersion table 11 in the predetermined speed period t2. Maintain at rotation speed α rpm. Even in the constant speed period t2, separation of articles (separation from the surface of the dispersion table 11) occurs due to centrifugal force. However, in the acceleration period t1, the inertial force is further generated in order to increase to a predetermined rotational speed αrpm in a short period. . Therefore, in the acceleration period t1, the article is more easily separated from the surface of the dispersion table 11. Thereby, the stable supply of articles from the dispersion table 11 to the radiation feeder 20 can be realized. Further, the article peeled off from the dispersion table 11 during acceleration and moved in the outer peripheral direction can be further moved in the outer peripheral direction by control after acceleration (control in the constant speed period t2).

  In addition, if the rotational speed of the dispersion | distribution table 11 in the constant speed period t2 is set high, it is possible to peel the articles adhering to the surface of the dispersion | distribution table 11. FIG. Specifically, in this embodiment, when a rotational speed higher than a predetermined rotational speed αrpm driven during the constant speed period t2 is set, the centrifugal force acting on the article on the dispersion table 11 increases. Therefore, even during the constant speed period t2, the article attached to the surface of the dispersion table 11 can be peeled off. However, the combination weighing device 100 according to the above embodiment is a device for combining and weighing articles having a small size, and the size of the entire device is also small. Therefore, if the centrifugal force acting on the article becomes too large during the constant speed period t2, it becomes difficult to properly distribute and supply the dispersion feeder 11 to the radiation feeder 20. That is, the articles on the dispersion table 11 are dispersed toward a place away from the radiation feeder 20 by a large centrifugal force. As a result, stable supply of articles becomes difficult. Therefore, it is necessary to keep the rotational speed of the dispersion table 11 during the constant speed period t2 within a predetermined range corresponding to the set capability.

  In the combination weighing device 100 according to the above-described embodiment, the dispersion table 11 is controlled at such a rotational speed that the article attached to the surface of the dispersion table 11 is peeled off from the surface of the dispersion table 11 during the acceleration period t1. Thereby, articles can be dispersed with a small centrifugal force during the constant speed period t2.

(3-3)
In the combination weighing device 100 according to the above-described embodiment, the dispersion table 11 includes conical portions (first inclined portion and second inclined portion) 11a and 11b and a horizontal portion (horizontal portion) 11c. The 1st inclination part 11a and the 2nd inclination part 11b are located in the center of the dispersion | distribution table 11, and have an inclined surface. The horizontal part 11c is located around the second inclined part 11b. The articles are dispersed from the center of the dispersion table 11 in the outer peripheral direction (radially outward). That is, the article is moved from the first inclined portion 11a and the second inclined portion 11b to the horizontal portion 11c. The horizontal part 11c has a horizontal plane.

  The conical portion constituted by the first inclined portion 11a and the second inclined portion 11b has an inclined surface extending downward from the radial center toward the outside. That is, the first inclined portion 11a and the second inclined portion 11b are easily moved in the direction toward the outer periphery. On the other hand, the horizontal part 11c has a horizontal surface. The horizontal part 11c is located around the second inclined part 11b. The article on the horizontal plane of the horizontal portion 11c does not move unless a force is applied. When the dispersion table 11 has a configuration that does not have the horizontal portion 11c, the article supplied from the article supply unit 90 travels downward from the center toward the outside through the inclined surface of the dispersion table 11, Immediately thereafter, it moves to the radiation feeder 20. However, as for the dispersion | distribution table 11 which concerns on the said embodiment, the outer edge part is horizontal. Therefore, the article is temporarily stored in the horizontal portion 11 c before being conveyed to the radiation feeder 20. As a result, a small amount of articles can be supplied from the dispersion table 11 to the radiation feeder 20.

  The first inclined part 11a and the second inclined part 11b have different inclinations with respect to the horizontal direction. Specifically, the inclination with respect to the horizontal direction of the 1st inclination part 11a is larger than the inclination with respect to the horizontal direction of the 2nd inclination part 11b. Therefore, the article falling on the first inclined portion 11a can reduce the falling speed of the article due to the difference in inclination of the inclined surfaces of the first inclined portion 11a and the second inclined portion 11b.

(4) Modification (4-1) Modification A
In the above embodiment, the combination weighing device 100 includes the article supply unit 90, but the article supply unit 90 may be a device different from the combination weighing device 100.

(4-2) Modification B
In the said embodiment, the dispersion | distribution table 11 has the horizontal part 11c which comprises an outer edge part. The horizontal portion 11c has a horizontal plane extending in parallel to the horizontal direction. Here, the horizontal portion 11c may have an upward inclined surface instead of the horizontal surface. Here, the upward inclined surface is an inclined surface in which the height position of the radially outer end portion of the horizontal portion 11c is slightly above the height position of the radially inner end portion. That is, the surface of the horizontal portion 11c extends slightly upward from the radially inner side to the outer side.

  Thereby, it can suppress that the articles | goods which fell to the horizontal part 11c from the 1st inclination part 11a and the 2nd inclination part 11b are discharged | emitted to the radiation feeder 20 immediately. That is, articles can be temporarily stocked in the horizontal portion 11c. As a result, a small amount of articles can be supplied from the dispersion table 11 to the radiation feeder 20.

(4-3) Modification C
The time lengths of the acceleration period t1, the constant speed period t2, the deceleration period t3, and the stop period t4, and the rotation speed of the dispersion table 11 during the acceleration period t1, the constant speed period t2, and the deceleration period t3 are respectively described above. It is not limited to the time illustrated in the form. The time lengths of the acceleration period t1, the constant speed period t2, the deceleration period t3, and the stop period t4, and the rotation speed of the distribution table 11 during the acceleration period t1, the constant speed period t2, and the deceleration period t3 are stored in the distribution table 11. An inertial force acts on the attached article during the acceleration period t1, and a desired amount of the article is conveyed to the radiation feeder 20 during the constant speed period t2, and can be changed as appropriate.

(4-4) Modification D
The combination weighing device 100 according to the embodiment includes 14 radiation feeders 20, pool hoppers 30, and weighing hoppers 40, and the combination weighing of articles is performed by 14 heads HD. Here, the number (the number of heads) of the radiation feeder 20, the pool hopper 30, and the weighing hopper 40 is not limited to 14. For example, the number of the radiation feeders 20, the pool hoppers 30, and the weighing hoppers 40 is 10, 16, or 24, and constitutes 10, 16, or 24 heads HD. Also good. Furthermore, other numbers of heads HD may be configured.

(4-5) Modification E
In the above-described embodiment, the combination weighing apparatus 100 that generates a collection of articles (combination of articles) having a desired total weight or a desired total number by combining a small amount of small-sized articles has been described as an example. The size of the dispersion table 11 and the radiation feeder 20 provided in the combination weighing device 100 is a size much smaller than that used in a large combination weighing device in accordance with the size of the article to be handled.

  Here, the dimension of the dispersion | distribution table and radiation feeder which comprise a combination weighing | measuring apparatus is not restricted to the dimension illustrated by the said embodiment. The dimensions of the dispersion table and the radiation feeder can be appropriately changed according to the dimensions of the articles handled by the combination weighing device 100. Similarly, the dimensions of other configurations included in the combination weighing device are also appropriately changed according to the type (dimension) of the article handled by the combination weighing device.

(4-6) Modification F
In the combination weighing device 100 according to the above embodiment, during the acceleration period t1 of the dispersion table 11, an inertial force that causes the article attached to the surface on the dispersion table 11 to loosen the degree of adhesion to the surface by the rotation of the dispersion table 11 is reduced. The dispersion table 11 is driven by the working acceleration.

  Here, the combination weighing device 100 further has a deceleration at which an inertial force is applied so that an article attached to the surface of the dispersion table 11 further loosens the degree of adhesion to the surface by the rotation of the dispersion table 11 during the deceleration period t3. The dispersion table 11 may be driven. Specifically, the drive control unit 81a changes the dispersion table 11 from the constant speed state to the stationary state and decelerates (deceleration period t3), thereby weakening the adhesive force of the articles attached to the dispersion table 11. Alternatively, the article is peeled from the dispersion table 11. Accordingly, an article whose degree of adhesion to the surface of the dispersion table 11 is weakened at the next acceleration can be reliably peeled off from the surface of the dispersion table 11, so that a stable supply of the article is possible.

11 Distributed table (distribution unit)
11a 1st inclination part (inclination part)
11b 2nd inclination part (inclination part)
11c Horizontal part 12 Dispersion table drive motor (drive part)
20 Radiation feeder (conveyance unit)
30 Pool hopper 31 Gate 32 Pool hopper drive motor 40 Weighing hopper (weighing section)
41 Gate 42 Load cell 43 Weighing hopper drive motor 80 Control device 81a Drive control unit 81b Calculation unit 90 Article supply unit 100 Combination weighing device

JP 59-97913

Claims (4)

A dispersion unit for dispersing the article in the outer circumferential direction;
A driving unit that intermittently drives and rotates the dispersion unit;
A drive control unit for controlling the drive unit;
A plurality of conveyance units for conveying the article distributedly supplied from the dispersion unit;
A plurality of weighing units that are provided corresponding to the conveying units and that weigh the articles conveyed by the plurality of conveying units;
A calculation unit that selects a weighing unit close to a target weight or a target number among the plurality of weighing units based on the weight of the articles weighed by the plurality of weighing units;
With
A combination weighing device that discharges articles in the weighing unit selected by the calculation unit,
The combination weighing device, wherein the drive control unit moves the article in the outer circumferential direction of the dispersion unit at the start of rotation for driving the dispersion unit from a stationary state. The rotation start of the dispersion unit by the drive unit is the acceleration of the dispersion unit,
The combination weighing device according to claim 1. The dispersion unit is
An inclined part located at the center of the dispersing part and having an inclined surface;
A horizontal portion located around the inclined portion and having a horizontal surface or an upward inclined surface;
Having
The combination weighing device according to claim 1 or 2. The drive control unit further includes:
Weakens the adhesive force of the article that has adhered to the dispersing portion during deceleration to change the rotating state of the dispersing portion from the rotating state;
The combination weighing device according to claim 2 or 3.

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