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    • 专利摘要:
    A combination weighing apparatus 1 includes a distribution table 2 and a control unit 8 that controIs the rotation of lhe distribution table 2. The distribution table 2 is provided wlth a gentle slope surface 2f, and has dircetivity in which an article supply amount in a direction toward the gentle slope surface 2f is .larger than those of the other directions. The control unit 8 repeatedly determines whether a pool hopper 4 of each of heads H1 to Hn is emply at every predetermined time T, integrates scores by giving a score to the head Hm corresponding to the pool hopper 4 determined as an empty state, and rotates the distribution table 2 so that the gentle slope surface 2f faces a high-integration-value head llj.
    公开号:DK201370676A1
    申请号:DK201370676
    申请日:2013-11-13
    公开日:2015-06-08
    发明作者:Akinari Takeguchi
    申请人:Ishida Seisakusho；
    IPC主号:
    专利说明:

    TITLE OP THE INVENTION COMBINATION WEIGHING APPARATUS B ACKGROUND OF TOE TNYENTTQN
    Field of the invention [0001] The present invention relates to a combination weighing apparatus.
    Related Background Art.
    [0002] In recent years, a combination weighing apparatus that employs a rotary distribution unit has been widely distributed. For example, a combination weighing apparatus disclosed in Japanese Unexamined Patent Application Publication No. 2010-175408 includes a distribution unit that is formed in an. eccentrically conical, shape and includes a steep slope surface and a gentle slope surface so as to distribute articles input from the upside thereof, plural heads that are disposed in a circular shape around foe distribution unit, a detection unit that detects a shortage head in which the articles arc not sufficiently supplied to a hopper thereof among foe plural heads, and a control unit that drives the distribution unit in both right and left circumferential directions based on the detection result of the detection unit so as to position and stop the distribution unit so that foe gentle slope surface faces foe shortage head. In the combination weighing apparatus, when there are plural shortage heads, foe control unit sequentially positions the distribution unit with respect to the plural shortage heads in order in which foe driving amount of foe distribution unit becomes minimal.
    SUMMARY OF THE IN VENTION
    [0003] However, when a '•strongly sticky article” such as a chicken is weighed by the combination weighing apparatus, it is not easy to equally supply the “strongly sticky article” to the hoppers arranged around the distribution unit, and it is difficult to realize a highly precise combination weighing operation.
    [0004] An object, of the present, invention is to provide a combination weighing apparatus with high weighing precision by suppressing an unequal supply of an object to be weighed.
    [0005] Å combination weighing apparatus according to a first aspect of the present invention Is a combination weighing apparatus in which plural heads each including a hopper weighing art object to be weighed are arranged in parallel in the circumferential direction, and includes a distribution table and a control unit that controls the rotation of the distribution table. The distribution table has a distribution function of sending an article to each of the heads mid causes the distribution function to have directivity in which an article supply amount, in a first direction is larger than those of the other directions. The control unit repeatedly determines whether the hopper of each head is empty at every predetermined time, integrates scores by giving a score to the head corresponding to the hopper determined m an empty state, and rotates the distribution table so that the first direction faces a liigli-integration-value head for the scores, [0006] In the combination weighing apparatus, since the control unit recognizes the direction of supplying the object to be weighed to the hopper based on the score and orients the object to be weighed toward the direction, the unequal supply of the object, to be weighed is suppressed, As a result, the weighing precision is improved.
    [0007] A weighing apparatus according to a second aspect of the present invention is the weighing apparatus according to the first aspect,-wherein the predetermined time is set to be shorter than a minimum time of a discharge interval of the object to be weighed.
    [0008] For example, when there is an increase in the predetermined time for determining whether the hopper of each head Is empty, an erroneous determination state is maintained for a long time such that the pool hopper that becomes empty after the object to be weighed is discharged therefrom is-not determined as an empty state, and hence diere is a possibility that the supply target of the object to he weighed may not be equally disposed. However, in the combination weighing apparatus, since the predetermined time is shorter than the minimum time of the discharge interval of the object to be weighed, the erroneous determination state is shortened by that much. As a result, die unequal supply of the object to be weighed is suppressed, and hence the weighing precision and the productivity are improved.
    [0009] A combination weighing apparatus according to a third aspect of the present invention is the combination weighing apparatus according to the first aspect or the second aspect, wherein the control unit gives the score to the first head that has the empty hopper and gets the score among the plurality of heads even when the hopper of the second head adjacent to the first head is empty.
    [0010] it needs to be considered that the rotary distribution table does not transport the object to be weighed in a pinpoint manner and that a certain variation occurs in the transportation direction. Accordingly, in the combination weighing apparatus, the control unit makes a state in which many hoppers standing by for input of an object to be weighed exist in a direction in which the integration value is high by taking information representing the empty state of the adjacent hopper and increasing the integration valne of the score. Thus, even when the transportation direction varies to thereby deviate from the hopper having a high integration value, tiro object to be weighed is input to at least one of the hoppers standing by for input [00.11 j Λ combination weighing apparatus according to a fourth aspect of the present invention is the combination weighing apparatus according to the third aspect, wherein the control unit resets an integration value of the score of the first head when the object to be weighed is Input to the hopper of at least one of the first head and the second head, [0012] For example, when the integration value remains, until the object to be weighed is input to the hopper of the high-integration-va!ue head, the integration value of the specific head particularly Increases, and hence there is a possibility that the supply target of the objelf M fed weighed may be 'unequally disposed, However, in the combination weighing apparatus, since the integration value of the first head is reset even when the object to be weighed is input to the hopper of at least one of the first head and the second head adjacent thereto, it is possible to prevent the integration value of the specific hopper from being particularly increased, [0013] A combination weighing apparatus according to a fifth aspect of the present invention is the combination weighing apparatus according to the first aspect, wherein the control unit stops the distribution table after rotating the distribution table so that the first direction faces a high-inlegmtion-value head and resets the integration value of the head after a predetermined stop Urne elapses, ff0i4] For example, when the integration value remains until the object to be weighed is input to the hopper of the ‘high-integration-value head”, the integration value of the specific head particularly increases, fid hence there is a possibility that the supply target of the object to be weighed may be unequally disposed. However, in the combination weighing apparatus, since the -integration Value of the head facing the first direction is reset after a predetermined stop time elapses, it is possible to prevent the integration value of the specific head from being particularly increased.
    [0015] Λ combination weighing apparatus according to a sixth aspect of the present invention is the combination weighing apparatus according to the fifth aspect, wherein the stop time of the distribution table is changeable.
    [0016] Since the supply speed needs to be changed in accordance with the type of tim object to be weighed, the distribution table stop tithe needs to be also changed in accordance with the change in the supply speed. In the combination weighing apparatus, since the distribution table stop time is changeable, a user may conveniently use the combination weighing apparatus, [0017] A combination weighing apparatus according to a seventh aspect of the present invention is the combination weighing apparatus according to the first aspect, wherein the control unit resets the integration value of the score of the first head when the object to be weighed is input to the hopper of at least one of the first head and tire second head adjacent to the first head among the plurality of heads.
    [0018] For example, when the integration value remains until the object to be weighed is input to the hopper of the hlgh-inregrafion-vahie head, the integration value of the specific head paitieuiarly increases, and hence there is a possibility that the supply target of the object to be weighed may be unequally disposed. However, in the combination weighing apparatus, since the integration value of the first head is reset even when the object to be weighed is input to the hopper of at least one of the first head and the second head adjacent thereto, it is possible to prevent the integration value of the specific hopper .from being paitieuiarly increased.
    BRIEF DESCRIPTION OF THfi DRAWINGS
    [0019] Fig. 1 is a side view illustrating a combination weighing apparatus according to an embodiment of the present invention.
    [0020] Fig. 2 is a top view illustrating the combination weighing apparatus.
    [0021] Fig. 3 is a control block diagram illustrating the combination weighing -apparatus.
    [0022] Fig. 4A is a control flowchart illustrating an operation until an article supply target is determined.
    [0023] Fig. 4B is a control flowchart illustrating an operation after the article supply target is determined.
    DU SCRIPT!ON OF THE PREFERRED EMBODIMENTS
    [0024] Hereinafter, exemplar)'' embodiments of the present, invention will be described with reference to the drawings. Furthermore, the embodiments boiow are specific examples of the present invention, and do not limit the technical scope of the present invention.
    [0025] (1) Configuration of combination weighing apparatus I
    Fig. 1 is a side view illustrating a combination weighing apparatus 1 according to an embodiment of the present invention, Fuiiher, Fig. 2 is a top view illustrating the combination weighing apparatus 1. In Figs. 1 and 2, the combination weighing apparatus 1 includes a distribution table 2, plural heads H that· are-arranged around the distribution table 2, a collection discharge chute 70, and a control unit 8 (sec Fig. 3), Bach head H includes a supply unit 3, a pool hopper 4, and a weighing hopper 5. Furthermore, in this embodiment, an example of the combination weighing apparatus 1 equipped with twelve arranged heads H will be described.
    [0026] An object to be weighed (hereinafter, referred to as an “article M,!) is transported to the upper side of the distribution table 2 by a transportation conveyor 150 and is dropped onto the distribution table 2. The article M is, for example, an. article M such as a chicken that isi smooth and highly sticky.
    [0027] The supply unit 3 supplies the article M to the pool hopper 4 disposed at the downstream side of the supply unit 3, The pool hopper 4 is equipped with a gate 41, The pool hopper 4 temporarily stores the article M supplied from the supply unit 3, [0028] The weighing hopper 5 is provided below the pool hopper 4. The weight of the article M that is input from the pool hopper 4 to the weighing hopper 5 is detected by a load cell II. The weighing hopper 5 is equipped with a gate 51. The collection discharge chute 70 is disposed below the gate 51. The 'collection discharge chute 70 integrates the weighing values of the articles M respectively detected by the load cells 11 so that the integration value of the whole articles M becomes a target value or a value close to the target value, and drops the articles M to a downstream packaging device 90.
    [0029] (2) Specific configuration (24 ) Distribution table 2
    The distribution sable 2 distributes the article M supplied from the transportation conveyor 150 to the· supply unit 3. The distribution table 2 includes a table portion 2a that is formed in a conical shape of which the apex V is eccentrically disposed and a rotational driving portion 2b that rotatlonaily drives the table portion 2a. The drive source- of the rotational driving portion 2b is a stepping motor. Since the table portion 2a is formed so that the apex is eccentrically disposed, the table portion 2a includes a gentle slope surface 2f having a long generator and a steep slope surface 2e having a short generator, and the rotation center is set on the gentle slope surface 2f, [0030] The control unit 8 controls the rotational driving portion 2b so that the rotational driving portion 2b is turned on and off or is rotated at a predetermined constant speed. The control unit 8 rotates the table portion 2a at a speed that is set in advance in accordance with the type of the article M by the rotational driving portion 2b. .Furthermore, the rotation speed of the table portion 2a may be controlled so that the rotation speed increases or decreases in accordance with the supply amount of the article M.
    [0031] The article M slides on the slope surface so as to be supplied to the supply unit 3 by the inclination and the centrifugal force of the rotating table portion 2a.
    [0032] (2-2) Supply unit 3
    The supply unit 3 includes a trough 31 and two spiral, members 32 and 33. The trough 31 has a shape in which an upper half portion of a cylinder is substantially cut out. Accordingly, tiie trough 31 includes a bottom surface that is defined as the inner surface of the cylinder and m opened upper -surface. burthen the outer circumferential edge of the distribution table 2 is located directly above the supply unit 3, and the article M that is discharged from the outer circumferential edge of the distribution table 2 is delivered to the supply unit 3.
    [0033] Further, the trough 31 is disposed in aforward inclined posture so that the outer end is located at the lower side in relation to tire inner end, Thus, the bottom surface of the trough 31 becomes a down slope in a direction from the inner end of tire bottom surface to the outer end thereof [0034] The spiral members 32 and 33 are rotatably disposed on the bottom surface of the trough 31. The respective inner ends of the spiral members 32 and 33 are fixed to the rotation shaft 34. When the rotation abaft 34 is rotationaiiy driven by a spiral member rotational driving portion 30, the spiral members 32 and 33 are rotationaiiy driven In a direction in which the article M inside the trough 31 is extruded from tire inner end of the trough 3 j to the outer end thereof, [0035] (2-3) Pool hopper 4
    The pool hopper 4 temporarily stores the article M supplied from the supply unit 3, The pool hoppers 4 are disposed in a circular shape below the supply units 3, The respective pool hoppers 4 are disposed at the same interval.
    [0036] The pool hopper 4 is formed in a cylindrical shape that includes an input port and a discharge port. The input port is provided at the upper portion of the pool hopper 4 and the discharge port is provided at the lower portion of the pool hopper 4. 'the discharge port of each pool hopper 4 is equipped with the gate 41, and die discharge port of the pool hopper 4 is opened and closed by the gate 41, Specifically, the discharge port is opened and closed by the gate 41 using a stepping motor 42, and is controlled by the control unit 8 so that the discharge port is opened and closed. The pool hopper 4 opens the gate 41 and supplies the article M to the weighing hopper 5 belonging to the same head IT
    .(003¾ (2-4) Weighing hopper I
    The weighing hopper 5 weighs the article M supplied from the pool hopper 4 using the load cell 1.1. The weighing hopper 5 is disposed below the gate 41 of the pool hopper 4, [0031| 'The weighing hopper 5 includes an input port and a discharge porh The input port is provided at the upper portion of the weighing hopper 5, and the discharge port is provided at the lower portion of the weighing hopper 5, The discharge port of the weighing hopper 5 is equipped with the gate 51, and the discharge port of the weighing hopper 5 is opened and closed by the gate 51. Specifically, the discharge port is opened and closed by the gate 51 using a stepping motor 52, and is controlled by the control unit 8 so that the discharge port is opened and closed, The weighing hopper 5 bolds the article M when the gats 51 is closed, and drops the article M to the collection discharge chute 70 when the gate 51 is opened, [0039] (2-5) Collection discharge chute 70
    The collection discharge chute 70 is disposed below the weighing hopper 5. The collection discharge chute 70 includes an input port 71 and a discharge port 72. The input port 71 is provided at the upper portion of the collection discharge chute 70. The discharge port 72 is provided at the lower portion of the collection discharge chute 70. The center position of the discharge port 72 matches the center position of the input port 71, The collection discharge chute 70 collects the articles M dropped from the weighing hopper 5, and then discharges the collected articles M toward the packaging device 90 that is disposed at the downstream side.
    [0040] (2--6) Control unit 8
    Fig, 3 is a control block diagram illustrating the combination weighing apparatus h In Fig. 3, the control unit 8 includes a CPU 81 and a memory 82. The control unit 8 is connected to the transportation conveyor 150, the rotational, driving portion 2b, the stepping motor 42 for opening and closing the gate 41, the stepping motor 52 for opening and closing the gate 51, the load cell 10 mounted on each pool hopper 4, the load coll 11 mounted on each weighing hopper 5, and the spiral member rotational driving portion 30.
    [0041] A weighing signal PIG output from the load cell 10 is input to the control unit 8. Further, a weighing signal PIT output from the load ceil i i is input to the control unit S.
    [0042] The control unit 8 outputs a driving signal Pi5 for driving the transportation conveyor 150. Further, the control unit 8 outputs a driving signal P30 for driving the spiral members 32 and 33. Further, the control unit 8 outputs a driving signal P4 for opening and closing the gate 4 i of the pool hopper 4 of each head H. Further, the control unit 8 outputs a driving signal P5 for opening and closing the gate 51 of the weighing hopper 5 of each head H.
    [0043] (3) Operation of discharging article M from distribution table 2 to each head il
    The distribution table 2 rotates about the rotation center C. When the article M is input from the transportation conveyor 150 onto the gentle slope surface 2f, the article M slides on the gentle slope surface 2f in a direction moving away from the apex, and is discharged item the distribution table 2.
    [0044] In this way, the direction in which the article M is discharged from the distribution table 2 is substantially defined by the direction in which the gentle slope surface 2f of the distribution table 2 faces. Accordingly, when the direction of the gentle slope surface 2f is defined so that the article M is discharged toward the desired head PI by the-driving in the circumferential direction and the article M is dropped onto the gentle slope surface 2f, the article M may be supplied from the distribution table 2 to the .supply unit 3 of the head H.
    [0045] In tire conibination weighing apparatus i, the distribution table 2 may he driven in both directions of CW (clockwise rotation) and CGW (counter-clockwise rotation), and the position of the distribution table 2 may be defined so that the gentle slope surface 2f faces the arbitrary 'head H. For example, the article M is supplied to tire .head Hi 0 at the position of the gentle slope surface 2f of Fig. 2, [0046] (4) Operation of combination weighing apparatus .1 (4 -1) Basie operation
    The control unit 8 specifies the pool hopper 4 that does not store the article M based on the weighing signal FiO input from the load cell ! 0 of each pool hopper 4.
    [0047] Furthermore, in the example below, for convenience of the description, it is assumed that the pool hopper 4 of the head HI is specified as the pool hopper 4 that does not store the article M, [0048] The control unit 8 positions the distribution table 2 so that the· gentle slope surface 2f faces the head HI by driving the distribution table 2 based on the driving signal P2.
    |0O49] The control unit 8 discharges the article M by driving the transportation conveyor 150 based on the driving signal PIS. The article M is dropped on the gentle slope surface 2fi slides on the gentle slope surface 2f, and is discharged from the distribution table 2, so that the article Mis supplied to the supply unit 3 of the head HL
    [0050] in the supply unit 3, the article M may be efficiently transported by the mutual interaction of the pressing operation from the rear performed by the spiral members 32 and 33 and the sliding operation performed by the down slope. Further, in a state where the spiral members 32 and 33 are stopped without being rotationally driven, the spiral members 32 arid 33 serve as stoppers that prevent the unintended sliding action of the article M on the slope. Accordingly, when the spiral members 32 and 3.3 are rotationally driven in the supply unit 3 of the head 11 that docs not store the article M in the pool hopper 4 and the spiral members 32 and 33 are not rotationally driven in the supply unit 3 of the head H that stores the article M in the pool hopper 4, the article M may be supplied only to the pool hopper 4 to which the article needs to be supplied, [0051] The control unit 8 specifies the weighing hopper 5 that does not store the article M based on the weighing signal Pi i input from die load cell 11 of each head I I, Then, the control unit 8 supplies the article M stored in the pool hopper 4 to the weighing hopper 5 by opening the gate 41 of the head H that does not store the article M in the weighing hopper 5 based on the driving signal P4, [0052] Each load cell 11 of the heads HI to HI2 weighs the articles M stored in the weighing hopper 5, and outputs the weighing signal PI 1 as the weighing result. The weighing signal Pil is input to the control unit 8, and the control unit 8 stores the weighing value of the articles M corresponding to each of the beads Hi to HI 2, [0053] The control unit 8 obtains the combination of the weighing hoppers 5 which realize a weight value that matches or is closest to a target weight among all weighing hoppers 5 storing the articles M in terms of a calculation. Then, in the weighing hoppers 5 involved with the combination, the gales 5.1 are opened by the driving signal P5 so as to discharge the articles M stored in the weighing hoppers 5, The articles that, are discharged from the weighing hoppers 5 are collected by tire collection discharge chute 70, and are discharged toward the packaging device 90.
    [0054] (4-2) Determination of supply order and supply operation based on the supply order
    In the description above, for convenience of the description, an example has been described in which only one pool hopper 4 is specified as the pool hopper 4 that does not store the article M, However, since the articles M may not foe actually stored in plural pool hoppers 4, the supply order Is obtained for the plural pool hoppers 4 that do not store the articles M, and the articles M are supplied according to the supply order, [0055] The control unit 8 repeatedly determines whether the pool hopper 4 of each of the heads HI to HI 2 is empty at every predetermined, time T when obtaining the supply order, integrates scores by giving a score to the head Hm corresponding to the pool hopper 4 determined as an empty state, and rotates the distribution table 2 so that the article M is delivered to a high.-integtation-val.ue· head Hi, By this operation, the article M may be first supplied to a region having many heads H to which the article M needs to be supplied. Hereinafter, this supply operation will, be· described with reference io the control flowchart, 'Furthermore, the predetermined time T may be set os a combination weighing cycle start, signal interval. Further, the present invention is not limited thereto, and the predetermined time T may be set as a hopper discharge signal interval, [0056] Fig. 4Λ is a control flowchart illustrating an operation until the supply target of the article M is determined, and Fig. 4B is a control flowchart illustrating an operation after the supply target is determined, [0057] (4-2-1) Description of steps Si to S10
    First, in step SI, the control unit 8 returns the position of the distribution table 2 to the original position as illustrated in Fig, 4Å, This operation is performed even when the precedent stop position is the oiiginai position.
    [0058] Next, in step S2. the control unit 8 sets the integration value of each of the twelve heads HI to HI2 to 0, and stores the integration values hi the memory. Subsequently, in step S3, the control unit 8 starts a time keeping operation by turning on a first timer.
    [0059] In step S4, the control unit 8 determines whether the elapsed time from the activation of the first timer of step S3 reaches tire predetermined time T, When the elapsed time reaches the predetermined time 1] the control unit 8 moves the routine to step SS. Meanwhile, when the elapsed time does not reach the predetermined time T yet, the control unit 8 keeps monitoring the elapsed time irt step 84.
    [0060] Furthermore, the predetermined time T is set to be shorter than the minimum time of the discharge interval of the article M. This is because of the following reason. When there is an increase in the predetermined time for determining whether the pool hopper 4 of each of the heads HI to Γ112 is empty, mi erroneous determination state is maintained for a long time such that the pool hopper 4 that becomes empty after the article M is discharged therefrom is not determined as an. empty state, and hence there is a possibility that the supply target of the article M may not be equally disposed.
    [006.1] However, in the combination weighing apparatus 1 of this embodiment, since the predetermined time T is set to be shorter than the minimum time of the discharge interval of the article M, the erroneous determination state may be shortened by that much, [0062] In step S5, the control unit 8 gives a score 1 to the head 11' including the empty pool hopper 4, For example, when the pool hopper 4 of the m-th head Htn is empty, the integration value of the head 1ini becomes j, [00o3] In step S6, the control unit 8 determines whether the pool hopper 4 of the head Hm-1 adjacent to die head Hm is empty, and moves the routine to step S7 when the pool hopper 4 of the head Hm-1 is empty or moves the routine to step S71 when the pool hopper 4 of the headlim-1 is not empty [0064] In step S7, the control unit 8 gives a score I id the head Hm, Since the last integration value of the head Hm is 1., the integration value of the head ildm-beecanesJi [0065] In step $8, the control unit 8 determines whether the pool hopper 4 of the head ITm+1 adjacent to the head Hm is empty, and moves the routine to step S9 when the pool hopper 4 of the head Hm+1 is empty or moves the routine to step S91 when the pool hopper 4 of the head HnrH. is not empty.
    [0066] In step S9, the control unit 8 gives a score 1 to the head Hm, Since the Iasi integration value of the head Hm is 2, the integration value of the head Hni becomes 3.
    [0067] In. step S10, the control unit. 8 specifies the head Ilj having a maximum integration value among the twelve heads HI to HI 2.
    [0068] (4--2-2) Description of ship S6 —> step S7.1 steps S8 to S10 On the other hand, when the control unit 8 determines that the pod hopper 4 of the head Hm i adjacent to the head Hm is not empty in step S6, the control unit 8 moves tiro routine to step S7.1 so as to reset the integration value of the heads Hm-2, Hm-1, and Hm and moves the routine to step S8, [G069j When the control unit 8 determines that the pool .hopper 4 of the head Hm+1 adjacent to the head Hm is empty in step $8, the control unit 8 moves the routine to step S9 m as to give a score 1 to the head Hm, Since the last, integration value of the head Hm is reset to 0, the integration value of the head Hm becomes I« [0070] Then, in step SI0, the control unit 8 specifies the head Hj having a maximum integration value in the twelve heads HI to H12.
    [0071] (4-2-3) Description of steps S6 ίο S8 -» step S91 -+ step S1.0 When the control unit 8 determines that the pool hopper 4 of the head Hm~i adjacent to the head Hm is empty in step S6, the control unit 8 moves the routine to step S7 so as to give a score i to the head Hm. Sines the last integration value of the head Htn is i, the integration value of the head Hm becomes 2.
    [0072] When the control unit 8 determines that the pool hopper 4 of the: head Hm+1 adjacent to the head Hm is not empty in step 88, the control unit 8 moves the routine to step S9I so as to reset the integration value of the heads Hm, Hmf 1, and Hm+2.
    [0073] Then, in step S10, the control, unit 8 specifies the head 1¾ having a maximum integration value in. the twelve heads Ml to 1112, [0074] (4-2-4) Description of step So —> step S71 --> step S8 —> step S91 -+ step S10
    When the control unit 8 determines that the pool hopper 4 of the;
    Bead Hm-1 adjacent to the head Hm k not empty in step S6, the control unit- 8 moves the routine to step S71 so as to reset the integration value of the heads lim-2, Him-1, and Hm, and moves the routine to step S8.
    [0075] When the control unit 8 determines that the pool hopper 4 of the head Bm+! adjacent to the head Hm is not empty in step S8, the control unit 8 moves the routine to step S91 so as to reset the integration value of the heads Hm, Hm+i, and linrt-2.
    [0076] Them in step S10, the control unit 8 specifies the head I Jj having a maximum integration value in the twelve heads HI to 1Π2, [0077] (4-2-5) step S). 1 to step S19 in step S H, the control unit 8 rotates the distribution table 2 so that the gentle slope surface 2f of 'the distribution table 2 faces the head Hj, The power of the rotational driving portion 2b of the distribution table 2 is generated by a stepping motor. The position of each head corresponding to which number of pulses of the driving pulses of the stepping motor from the original position is stored in the memory in advance. Thus, the control unit S may calculate the number of pulses necessary for the position of the head Ilj from the head position until just, before the gentle slope surface 2f of the distribution table 2 faces.
    [0078] In step S12, the control unit 8 determines whether the gentle slope surface 2f of tire distribution table 2 faces the head Hj. The control unit 8 may perform this determination depending on whether the number of necessary pulses is all output to the stepping motor of the rotational driving portion 2b after calculating the number of pulses necessary to the position of the head Ilj from the head position until just before the gentle slope surface 2f of the distribution table 2 faces. (007.9] The control unit 8 moves the routine to step Si3 when it is determined that the gentle slope surface 2f of the distribution table 2 faces the head Hj or stays in step SI2so as to keep monitoring whether the gentle slope surface 2f of the distribution table 2 faces the head Hj when it is determined that the gentle slope surface 2f of the distribution tabic 2 does not lace the head Hj.
    [0080] In step S13, the control unit 8 stops the rotation of the distribution table 2 and moves the routine to step S14. Subsequently, the control unit 8 starts a time keeping operation by turning on a second timer instep SI4.
    [0081] In step SI5, the control unit 8 determines whether the elapsed time from the activation of the second timer in step S14 reaches the stop time S, and moves the routine to step SI<5 when the elapsed time reaches the stop time S or stays in step SI5 so as to keep monitoring the elapse time when the elapsed time does not reach the stop time S yet.
    [0082] Furthermore, in this embodiment, the stop lime of die distribution table 2 is changeable so as to correspond to a change in the stop time S of the distribution table 2 in accordance with a change in the supply speed of the article M.
    [0083] in step SI6, the control unit 8 resets die integration value of the head Hj and moves the routine to step SI7.
    [0084] In step S1.7,. the control unit 8 resets the first timer arid the second timer and moves the routine to step SI8, In step SIS, the control unit 8 determines whether an operation stop instruction is issued and returns the routine to step S3 when it is determined that the operation stop instruction is not issued or moves the routine to step S19 m as to stop tli© operation when it is determined that the operation stop instruction is issued.
    [0085] (5) Characteristic (5-1)
    The combination weighing apparatus i includes the distribution table 2 and the control unit 8 that controls the rotation of the distribution tabic 2. The distribution table 2 is provided with the gentle slope surface 2f and has directivity in which the article supply amount in the direction toward the gentle slope surface 2f is larger than those m the other directions, The control unit 8 repeatedly determines whether the poo! hopper 4 of each of the heads HI to H12 is empty at every predetermined time T, integrates scores by giving a score to the head Hrn of the pool, hopper 4 determined as an empty state·, and rotates the distribution table 2 so that, the gentle slope surface 2f faces the high-integration-value head Hj, Since the control unit 8 may recognize a region where the number of the pool hoppers 4 to which the articles M need to be supplied is large based on the score and orients the articles M toward the region, it is possible to suppress the unequal supply of the articles M. As a result, the weighing precision is improved, [0086] :(5-2)
    Since the predetermined time T is set to be shorter than til© minimum time of the discharge interval of the article M, it is possible to shorten the time of the “erroneous determination in which the empty pool, hopper 4 is determined as a non-empty state’*. As a result, the unequal supply of the article M is suppressed, and hence the weighing precision and the productivity are improved, [0087] (5-3)
    The control unit 8 makes a state in which .many pool, hoppers 4 waiting for the input of the articles M exist in a direction in which the integration value is high by taking information representing the empty state of the adjacent pool hopper 4 and increasing the integration, value of the score. Thus, even when, the distribution direction varies to thereby deviate from the poo! hopper 4 of the head H having a high integration value, the article M is input to at least one of the pool hoppers 4 standing by for input.
    [0088] (5-4)
    In order to prevent the integration value of the score of the specific head from being particularly increased, the control unit 8 resets the integration value of the head 11m even, when the article M is input to the pool hopper 4 of the head Hm+1 adjacent to the head Bm having the empty pool hopper 4.
    [00891 (5-5)
    Further, in order to prevent the iiitegmtlon value of the score of the specific head from being particularly increased, the control unit 8 stops the distribution table 2 after rotating the distribution table 2 so that the gentle slope surface 2f faces the head Hj having a high integration value, and resets the integration vdluc of the head Hj after a predetermined;·'Stop· time S elapses.
    [φ|Ρ] ί@%
    The supply speed needs to be changed in accordance with the type of the article M, and the stop time | of the distribution table 2 heeds to be also changed in accordance with a change in the supply speed, in the combination weighing apparatus, since the stop time S of the distribution table 2 is changeable, a user may conveniently use the combination weighing apparatus, [0091 j ((>) Others
    In the above-described embodiments, a combination weighing cycle start signal interval may be employed as the predetermined time T. This is because of the following reason, in the combination weighing cycle start, signal, the origin at which the article is discharged from the hopper so that the hopper becomes empty is an interlocking signal or a spontaneous signal, and hence the hasis of the time becomes the origin of the interlocking signal or the like.
    [0092] Further, the predetermined time T is not limited to the combination weighing cycle start signal interval, and may be a hoppet-discharge signal interval This is because the origin at which the article is discharged from the hopper so that the hopper becomes empty is also a discharge signed; [0093] Further, the predetermined time T may be changeable. For example, it is possible to determine, “whether the pool hopper 4 of each head II is empty” after the time after the next combination weighing cycle start signal is generated instead of determining “whether the pool hopper 4 of each head H is empty” after the next combination weighing cycle start signal is generated at a time point elapsing by a predetermined time from the generation of the combination weighing cycle start signal, instead of every combination weighing cycle, Further, the predetermined time T may be an indefinite interval.
    [0094] Tn the combination weighing apparatus according to the present invention, since the control unit recognizes the direction of supplying the object to be weighed to the hopper based on the score and orients the object to be weighed toward the direction, the unequal supply of the object to be weighed is suppressed. As a result, the weighing precision is improved, [0095] As described above, according to the present invention, the combination weighing apparatus is useful to determine a supply order in an apparatus thai supplies articles to plural supply targets.
    权利要求:
    Claims (6)
    [1] 1. Å combination weighing apparatus in which a plurality of heads each including a hopper weighing- an object to be weighed are arranged in parallel in the circumferential direction, the combination weighing apparatus comprising; a distribution table that has a distribution function of sending an article to each, of the heads and causes the distribution, function to have directivity in which an. article supply amount in a first direction is larger than those of the other directions; and a control unit that controls the rotation of the distribution table, wherein the control unit determines whether the hopper of each head is empty at every predetermined time, integrates scores by giving a score to the head corresponding 10 the hopper determined as an empty slate, and rotates the distribution table so that tire first direction faces a high-integration-value head for the scores.
    [2] 2. The combination weighing apparatus according to claim 1, wherein the predetermined time is set to be shorter than a minimum time of a discharge inter val of the object to be- weighed.
    [3] 3. The combination weighing apparatus according to claim 1 or 2, wherein the control unit gives the score to the first head that has· the empty hopper and gets the score among the plurality of heads even when the hopper of the second head adjacent to the first head, is empty.
    [4] 4. The combination weighing apparatus according to claim 3, wherein the control unit resets an integration value of the score of the first head when the object to be weighed is input to the hopper of Mi least one of the first head and the second head,
    [5] 5 The combination weighing apparatus according to claim 1, wherein the control unit stops the distribution tabic after rotating the distribution tabic so that the first direction faces the high-integration-value head and resets the integration value of the head after a predetermined stop time elapses,
    [6] 6, The combination weighing apparatus according to claim % wherein the stop time of the distribution table is changeable, f, The combination weighing apparatus according to claim 1, wherein, the control unit resets the integration value of the score of the first head when the object to be weighed is input to the hopper of at least one of the first head and the second head adjacent to the first head among the plurality of heads.
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    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US20090260896A1|2005-09-21|2009-10-22|Ishida Co., Ltd.|Combination weighing apparatus|
    JP2009270985A|2008-05-09|2009-11-19|Ishida Co Ltd|Combined weighing apparatus|
    JP2010160127A|2009-02-10|2010-07-22|Ishida Co Ltd|Combination weighing device|
    JP2011145245A|2010-01-18|2011-07-28|Ishida Co Ltd|Combination weighing device|
    JP5230365B2|2008-11-08|2013-07-10|株式会社イシダ|Combination weighing device|
    JP5331471B2|2008-12-15|2013-10-30|大和製衡株式会社|Semi-automatic combination weigher|
    JP4339930B1|2009-01-29|2009-10-07|株式会社イシダ|Combination weighing device|KR970029416A|1995-11-30|1997-06-26|김광호|Objective lens driving device for optical pickup|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    JP2012251704|2012-11-15|
    JP2012251704A|JP6029945B2|2012-11-15|2012-11-15|Combination weighing device|
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