JP6076766B2 - Weighing device and weight sorter using the same - Google Patents

Description

  The present invention relates to a weighing device and a weight sorter using the same, and in particular, an endless conveyor having an endless rotating body, and a plurality of conveying means attached to the endless rotating body at regular intervals along the traveling direction thereof. The objects to be weighed that are provided in the circulation path of the endless circling body are sequentially transferred one by one, and the objects to be weighed are conveyed while the transferred objects to be weighed are conveyed. The present invention relates to a weighing device having a weighing conveyor for measuring the weight of an object, and a weight sorter using the weighing device.

  Conventionally, for example, this type of weighing device and weight sorter is disclosed in Patent Document 1. According to this prior art, an endless conveyor that rotates continuously is provided. A plurality of conveying claws as a plurality of conveying means are attached to the endless conveyor, specifically, a chain band as an endless rotating body constituting the endless conveyor at regular intervals along the rotation (running) direction. It has been. Each conveyance nail is supplied with an individual object (eg, seen as a fish) one by one. And each conveyance nail | claw conveys the said to-be-measured object by traveling according to a chain belt. Furthermore, a weighing mechanism is provided in the middle of the conveyance path of the object to be weighed by the conveyance claw. This weighing mechanism is, for example, a so-called weighing conveyor having a transfer belt provided on its weighing platform. The transfer belt (on the carrier side) of the weighing conveyor is close to the lower side of the chain band (on the carrier side) and travels at the same speed in the same direction as the chain band. When each transport claw reaches the position where the weighing conveyor is provided in the process of transporting the object to be weighed, it transfers the object to be weighed on the transfer belt of the weighing conveyor. Strictly speaking, the postures (tilting positions) of the respective conveying claws are controlled so as to be so. The weighing conveyor measures the weight of the object to be weighed transferred on the transfer belt while being conveyed by the transfer belt. When the measurement of the weight of the object to be weighed by the weighing conveyor is completed, in detail, when the object to be weighed reaches the vicinity of the downstream end on the transfer belt, the object to be weighed is again transported from the transfer belt. The posture of each conveyance claw is controlled so that it is transferred to the claw and strictly speaking. Furthermore, the object to be weighed transferred to the original conveying claw, that is, the object to be weighed after the weight measurement by the weighing conveyor is conveyed to the downstream side of the weighing conveyor. On the downstream side of the weighing conveyor, a plurality of discharge chutes corresponding to a plurality of weight stages are provided in a line along the conveyance path of the objects to be weighed by the conveyance claws. The objects to be weighed after the weight measurement are selectively discharged to the discharge chutes based on the weight measurement result, and strictly speaking, the postures of the respective transport claws are controlled so as to be so. As a result, the weighing of the object to be weighed, in particular, a large amount of the object to be weighed, is selected based on the weight measurement and the result.

Japanese Patent Publication No. 2-16978

  By the way, in the above-mentioned prior art, for example, as shown in FIG. 7, the attachment interval (pitch) of each conveyance claw to the chain band is Pz, and the conveyance speed of the object to be weighed by each conveyance claw is Vz. To do. Then, the processing amount of the object to be weighed per unit time, that is, the processing capability Rz is expressed by the following formula 1.

<< Formula 1 >>
Rz = Vz / Pz

  In addition, the conveyance speed Vz of the to-be-measured object by each conveyance nail | claw is equivalent to the conveyance speed of the said to-be-measured object by the measurement conveyor (transfer belt). From this, for example, if the length dimension of the weighing conveyor, that is, the so-called machine length is Lz, the weighing time Tz by the weighing conveyor for one object to be weighed is expressed by the following equation (2).

<< Formula 2 >>
Tz = Lz / Vz

  The weighing time Tz represented by this equation 2 correlates with the weighing accuracy by the weighing conveyor. Specifically, the longer the weighing time Tz, the higher the weighing accuracy by the weighing conveyor, and the shorter the weighing time Tz, the lower the weighing accuracy by the weighing conveyor.

  Here, the attachment interval Pz of each conveyance claw with respect to the chain belt is set to at least the machine length Lz of the weighing conveyor (Pz ≧ Lz). This is to prevent a state in which two or more objects to be weighed are simultaneously placed on the weighing conveyor. Further, according to the above-described Expression 1, the processing capability Rz is improved as the attachment interval Pz is smaller (if the conveyance speed Vz of the object to be measured is constant). Therefore, in general, the attachment interval Pz is set as small as possible, that is, equivalent to the machine length Lz of the weighing conveyor (Pz = Lz). Then, the processing capability Rz represented by Expression 1 is also represented by the following Expression 3.

<< Formula 3 >>
Rz = Vz / Lz

  As can be seen from a comparison between the processing capability Rz represented by the equation 3 and the measurement time Tz represented by the above-described equation 2, these are in a contradictory relationship. For example, assuming that the machine length Lz of the weighing conveyor is constant, the higher the conveyance speed Vz of the object to be weighed, the higher the processing capability Rz, but on the other hand, the weighing time Tz is shortened, that is, the weighing accuracy is lowered. . The processing capability Rz decreases as the conveyance speed Vz of the object to be measured decreases, but on the other hand, the measurement time Tz increases, that is, the measurement accuracy increases. Further, if the conveyance speed Vz of the object to be weighed is constant, the processing capability Rz increases as the machine length Lz of the weighing conveyor decreases, but on the other hand, the weighing accuracy decreases. And the longer the machine length Lz of the weighing conveyor, the lower the processing capability Rz, but on the other hand, the weighing accuracy becomes higher. That is, if one of the processing capability Rz and the measurement accuracy is to be improved, the other is inevitably reduced, which is a sacrifice. In addition, both the processing capability Rz and the measurement accuracy cannot be improved at the same time.

  Accordingly, an object of the present invention is to provide a weighing device and a weight sorter using the same that can appropriately improve these without sacrificing both processing capability and weighing accuracy.

  In order to achieve this object, the first invention of the present invention is an invention related to a weighing device, and specifically, an endless circuit that travels at a predetermined speed along a circuit route passing through a predetermined measurement section. An endless conveyor having a body, and attached to the endless rotating body at a predetermined interval along the traveling direction thereof, the object to be weighed is supplied and the supplied object to be measured travels according to the endless rotating body. A plurality of transport means for transporting, and a transport path provided so as to be in series with each other along the circulation path of the endless circular body in the measurement section, and a load applied via the transport path And N (N: an integer of 2 or more) weighing conveyors to be measured. Here, the conveyance path of each weighing conveyor travels in the same direction as the traveling direction of the endless rotating body in the weighing section at the same speed as the traveling speed of the endless rotating body. And each conveyance means is divided into a plurality of groups, with N consecutive ones as one set. Further, for each set divided into the plurality of sets, N conveying means are associated with N weighing conveyors in a one-to-one relationship. In addition, in the weighing section, the respective conveying means are controlled so that the objects to be weighed are transferred to the conveying path of the weighing conveyor associated with the one-to-one relationship. The transfer control means is provided.

  That is, according to the first aspect of the present invention, the objects to be weighed are supplied to the respective conveying means, and in particular, the objects to be weighed are individually supplied one by one. And each conveyance means conveys the said to-be-measured object by traveling according to an endless revolving body. In this process, each transport means enters the weighing section. In this weighing section, each transport means transfers the objects to be weighed by itself onto the transport path of the weighing conveyor associated with the one-to-one relationship with each other. It is controlled by the transfer control means. Each weighing conveyor measures the weight of an object to be weighed that has been transferred to the conveying path while being conveyed by the conveying path. Thereby, the weight measurement of an object to be weighed, particularly a large amount of objects to be weighed, is realized.

  Here, for example, it is assumed that the attachment interval of each conveying means with respect to the endless rotating body is P, and the conveyance speed of the object to be weighed by each conveying means is V. Then, the processing capability R is expressed by the following formula 4 similar to the formula 1 in the above-described conventional technology.

<< Formula 4 >>
R = V / P

  In addition, the conveyance speed V of the to-be-measured object by each conveyance means is equivalent to the conveyance speed of the said to-be-measured object by a measurement conveyor (conveyance path). Therefore, if the machine length of the weighing conveyor (the length dimension of the conveyance path) is L, the weighing time T by the weighing conveyor for one object to be weighed is the same as the equation 2 in the above-described prior art. Expressed by Equation 5.

<< Formula 5 >>
T = L / V

  The weighing time T represented by the equation 5 correlates with the weighing accuracy by the weighing conveyor, similarly to the weighing time Tz represented by the equation 2 described above. That is, the longer the weighing time T, the higher the weighing accuracy by the weighing conveyor, and the shorter the weighing time T, the lower the weighing accuracy by the weighing conveyor.

  As described above, in the first invention, the processing capability R and the measurement time T are defined by the same mathematical expressions (Equation 4 and Equation 5) as those in the above-described prior art. Therefore, at first glance, the processing capability R and the metering time T in the first invention seem to be comparable to the processing capability Rz and the metering time Tz in the prior art. However, according to the first aspect of the invention, since N weighing conveyors are provided, P (interval of attaching each conveying means to the endless rotating body), V which is a calculation element of the processing capacity R and the weighing time T, V By appropriately setting the (conveying speed of the object to be weighed) and L (capacity of the weighing conveyor), these can be performed without sacrificing both the processing capacity R and the weighing time T (weighing accuracy). It becomes possible to improve.

  Specifically, the attachment interval P of each conveying means with respect to the endless rotating body is set to 1 / N or more of the machine length L of the weighing conveyor and less than the machine length L of the weighing conveyor. That is, both P and L are set so as to satisfy the condition represented by the following expression (6).

<< Formula 6 >>
L / N ≦ P <L

  The condition expressed by the equation 6 is also expressed by the following equation 7.

<< Formula 7 >>
P <L ≦ N · P

  In addition, for example, it is assumed that the length L of the weighing conveyor is equivalent to the length Lz of the weighing conveyor in the above-described prior art (L = Lz). Then, it is assumed that the conveyance speed V of the object to be weighed is also equivalent (V = Vz) to the conveyance speed Vz of the object to be weighed in the related art. Then, the measurement time T represented by the equation 5 is equivalent to the measurement time Tz in the prior art represented by the above equation 2 (T = Tz). In short, the weighing accuracy is equivalent to that in the prior art.

  On the other hand, as can be seen from Equation 6 or Equation 7, the attachment interval P of each conveyance means with respect to the endless rotating body is at least smaller than the machine length L of the weighing conveyor (P <L), that is, attachment of each conveyance claw in the prior art It is smaller than the interval Pz (P <Pz). From this, the processing capability R represented by the equation 4 is higher than the processing capability Rz in the conventional technology represented by the above-described equation 1 (or equation 3) (R> Rz).

  That is, according to this configuration (that is, a configuration in which L = Lz and V = Vz), while maintaining the measurement accuracy equivalent to that of the conventional technology, in other words, without sacrificing the measurement accuracy, it is more than the conventional technology. A high processing capability R can be obtained, that is, the processing capability R can be improved. In particular, when the attachment interval P of each conveying means with respect to the endless rotating body is minimum (P = L / N), the processing capability R is N times the processing capability Rz in the prior art (R = N · Rz). become.

  Further, when the attachment interval P of each conveying means to the endless rotating body is minimum (P = L / N), for example, the conveying speed V of the object to be weighed is 1 / N of the conveying speed Vz in the prior art (V = Vz / N). Then, the processing capability R becomes equivalent to the processing capability Rz in the prior art (R = Rz). On the other hand, the measuring time T is N times (T = N · Tz) the measuring time Tz in the prior art, and the measuring accuracy is improved accordingly. That is, according to this configuration (that is, a configuration in which L = Lz, P = L / N, and V = Vz / N), while maintaining the processing capability R equivalent to the processing capability Rz in the prior art, the processing is performed. It is possible to improve the measurement accuracy without sacrificing the capability R.

  Furthermore, depending on the setting of the attachment interval P of each conveyance means with respect to the endless circuit and the conveyance speed V of the object to be weighed, both the processing capability R and the measurement accuracy (measurement time T) can be improved at the same time. Instead of or in addition to the attachment interval P, the machine length L of the weighing conveyor may be set as appropriate. In any case, by satisfying the conditions represented by the above-described Expression 6 or Expression 7, these can be appropriately improved without sacrificing both the processing capability and the measurement accuracy.

  In addition, each conveyance means may have a conveyance nail attached to the endless rotating body in a rotatable state. The conveying claw has a shape that can hold the object to be weighed. For example, it has a shape suitable for holding the object to be weighed, such as an approximate fork (pitch fork) shape, a bowl shape, or a bowl shape. ing. Moreover, the guided part is provided in the position away from the base part which is an attachment part with respect to the endless rotating body of the said conveyance nail | claw. In this case, the transfer control means has the following transfer guide means. That is, the transfer guide means is provided so as to follow the circulation path of the endless rotating body over a predetermined section including at least the above-described measurement section, and when each of the transport means travels in the predetermined section, the respective transport Guide the guided part of the means. Thereby, transfer of the to-be-measured object to the conveyance path of the measurement conveyor matched by the above-mentioned one-to-one relationship by each conveyance means shall be implement | achieved. As such a transfer guide means, for example, there is a groove cam (planar groove cam) as an original joint to which a guided part is engaged as a follower.

  Further, the value of N described above may be 2, for example. In other words, two weighing conveyors are provided, and in addition, each conveying means is divided into a plurality of groups, each group consisting of two consecutive ones, and two conveyors are provided for each group. Assume that the means is associated with two weighing conveyors in a one-to-one relationship. In this case, the transfer guide means includes first guide means and second guide means provided on both sides of the circulation path with the circulation path of the endless circulation body in the predetermined section interposed therebetween. Of these, the first guiding means guides one guided portion of the two conveying means for each group. And a 2nd guide means guides the other to-be-guided part of the said 2 conveyance means for every group. In short, the two conveying means are controlled separately for each group. Thereby, each structure of a 1st guide means and a 2nd guide means is simplified, and also the structure of the transfer guide means containing these is simplified.

  Subsequently, a second invention of the present invention is an invention related to a weight sorter, and specifically includes a weighing device according to the first invention and a sorting means. The sorting means sorts the objects to be weighed after their weights are measured by the respective weighing conveyors according to a plurality of weight ranks based on the weight measurement results by the weighing conveyors.

  More specifically, the sorting unit includes a plurality of sorting ports and a sorting control unit. Each selection port corresponds to each weight rank, and is provided in a line along the circulation path in the selection section on the downstream side of the measurement section in the circulation path of the endless circulation body. The sorting control means transports the objects to be weighed after the weight measurement by the respective weighing conveyors to the sorting section, and the objects to be weighed after the weight measurement are based on the weight measurement results thereof. The respective conveying means are controlled so as to be selectively put into each sorting port.

  According to this configuration, the objects to be weighed after weighing by the respective weighing conveyors are further conveyed by the respective conveying means, more specifically by the conveying means associated with the weighing conveyor in a one-to-one relationship, in other words, The object to be weighed is transported again by the original transport means that transports the object to be transported to the transport path of the weighing conveyor, and further to the sorting section downstream of the weighing section. Then, in this sorting section, the object to be weighed after the weight measurement is selectively put into each sorting port based on the weight measurement result, and in short, put into the sorting port according to its weight rank. The As a result, sorting of the objects to be weighed, particularly a large amount of objects to be weighed, is realized by weight rank.

  Furthermore, according to this configuration, the length of the entire weight sorter can be shortened. That is, as described above, it is assumed that the length L of the weighing conveyor is equivalent to the length Lz of the weighing conveyor in the prior art. In this case, the attachment interval P of each conveyance means with respect to the endless rotating body is at least smaller than the attachment interval Pz of each conveyance claw in the prior art. Thus, if the attachment interval P of each conveyance means is small, according to this, the arrangement | positioning space | interval of each selection port in a selection area can be narrowed. As a result, the sorting section is shortened, and as a result, the overall length of the weight sorter including the sorting section is shortened.

  As described above, according to the present invention, in a weighing device and a weight sorter using the same, these can be appropriately improved without sacrificing both processing capability and weighing accuracy. This is extremely useful for efficiently processing a large amount of objects to be weighed with high accuracy.

It is a figure showing roughly the composition of the whole weight sorter concerning one embodiment of the present invention. It is a figure which shows the structure of the predetermined area in the same embodiment. It is an illustration figure which shows operation | movement of the conveyance nail | claw and the measurement conveyor in the predetermined area. It is an illustration figure which shows the mutual relationship of the conveyance nail | claw and a measurement conveyor. It is an illustration figure for demonstrating one effect in the same embodiment. It is a figure which shows another structural example of the predetermined area in the same embodiment. It is an illustration figure which shows the mutual relationship of the conveyance nail | claw and measurement conveyor in a prior art.

  An embodiment of the present invention will be described by taking a weight sorter 10 as an example.

  As shown in FIG. 1, the weight sorter 10 according to this embodiment includes an endless conveyor 30. The endless conveyor 30 includes a pair of sprockets 32 and 34 and a chain 36 as an endless rotating body spanned between the pair of sprockets 32 and 34. Although not shown in the drawings, an appropriate tensioning device for preventing the chain 36 from loosening is also provided. Further, for example, a motor 38 as a chain driving means is coupled to one of the pair of sprockets 32 and 34 (the right sprocket in FIG. 1) 32.

  According to this configuration, when the motor 38 is driven, one sprocket coupled to the motor 38, the so-called drive-side sprocket 32, rotates, for example, in a direction (clockwise direction) indicated by an arrow 40 in FIG. As a result, the chain 36 circulates between the driving side sprocket 32 and the other so-called driven side sprocket 34. Specifically, the carrier side (the upper side in FIG. 1) of the chain 36 travels in the direction from the driven sprocket 34 toward the driving side sprocket 32 (the direction from the left side to the right side in FIG. 1), and the return side ( 1 travels in a direction from the driving side sprocket 32 toward the driven side sprocket 34 (a direction from the right side to the left side in FIG. 1).

  Further, a plurality of conveying claws 50, 50,... As a plurality of conveying means are attached to the chain 36 at a constant interval Ps along the traveling (circulating) direction. Accordingly, when the chain 36 travels as described above, the transport claws 50, 50,... Also travel according to this, that is, along the circulation path of the chain 36. As will be described later, each conveying claw 50 appropriately changes its posture around the base 52 that is an attachment portion to the chain 36 during the traveling process.

  In addition, a measuring section Eg is provided in the middle of the circulation path of the chain 36, specifically, in the middle of the travel path on the carrier side of the chain 36. In this weighing section Eg, N, for example, two weighing conveyors 70 and 70 are arranged. These weighing conveyors 70 and 70 are of the same standard, respectively, a weighing unit 74 including a load cell 72 as a load detection means, a belt type conveyor unit 76 supported by the weighing unit 74, have. The two weighing conveyors 70 and 70 are arranged such that the conveyor portions 76 and 76 are in series along the circulation path of the chain 36 and are as close as possible. In addition, the carrier side of each conveyor unit 76, strictly speaking, an endless belt 78 described later, travels in the same direction as the carrier side of the chain 36 at the same speed.

  Although not shown, a supply device for the object to be weighed 100 is arranged on the upstream side (left side in FIG. 1) of the above-described weighing section Eg on the carrier-side travel route of the chain 36. This supply device supplies the objects 100 to be measured one by one to the respective conveying claws 50, 50,... When the respective conveying claws 50, 50,. It should be noted that the object to be weighed 100 is an individual of an appropriate size to be supplied one by one to each conveyance claw 50, 50,... There is.

  When the object to be weighed 100 is supplied as described above, each of the conveyance claws 50 conveys the supplied object to be weighed 100 while being held. For this reason, each conveyance nail | claw 50 is carrying out the shape suitable for hold | maintaining the to-be-measured object 100, for example, is carrying out the shape of a general fork shape (when viewed from the side, a general L shape).

  Specifically, with reference to FIGS. 2A and 2B in particular, each conveyance claw 50 is composed of a plurality of (for example, six) generally L-shaped members arranged in parallel to each other. It has a holding part 54 and a substantially round bar-shaped shaft part 56 coupled to a part of the holding part 54 that hits the root. The shaft portion 56 extends along the direction in which the substantially L-shaped members forming the holding portion 54 are arranged. In addition, the respective conveying claws 50 are arranged so that the shaft portions 56 extend in a direction horizontally crossing the traveling direction of the chain 36, in other words, the arrangement of the substantially L-shaped members constituting the holding portion 54 is the same direction. The two ends of the shaft portion 56 are attached to the chain 36 by an appropriate coupling member (not shown) as the base portion 52 described above. As can be seen from this, the chain 36 appears to be one in FIG. 1, but is actually a pair of chains provided in parallel to each other. Further, both end portions of the shaft portion 56 are attached as the base portion 52 as described above. In addition, the attachment aspect of each base 52 with respect to each chain 36 is made rotatable.

  Further, each of the conveying claws 50, 50,... Is grouped into a plurality of sets M, with N consecutive ones, that is, two as one set m. For each set m (m = 1, 2,..., M), the two conveying claws 50 and 50 are associated with the two weighing conveyors 70 and 70 in a one-to-one relationship. It has been.

  Specifically, for each set m, the conveyance claw 50 that precedes the two conveyance claws 50 and 50 (that is, the object to be weighed 100 is supplied first by the supply device described above) is, for example, A. Sorted into groups (concepts different from the set m mentioned here). Then, the transport claws 50 following the transport claws 50 of the A group are distributed to a group B. In addition, the transport claws 50 of the A group are associated with the weighing conveyor 70 located on the upstream side of the two weighing conveyors 70 and 70, for example. And the conveyance nail | claw 50 of B group is matched with the measurement conveyor 70 located in a downstream.

  Each transport claw 50 transports the object 100 while holding the object 100 as described above, and enters the weighing section Eg in the process. In the weighing section Eg, each conveyance claw 50 transfers the object 100 held by itself to the conveyor section 76 of the weighing conveyor 70 corresponding to itself, and strictly speaking, an endless as a conveyance path. Transfer to the carrier side of the belt 78. That is, the transport claw 50 of the A group transfers the object 100 held by itself to the conveyor unit 76 of the weighing conveyor 70 for the A group. And the conveyance nail | claw 50 of B group transfers the to-be-measured object 100 which self hold | maintains to the conveyor part 76 of the measurement conveyor 70 for B groups.

  The conveyor section 76 of each weighing conveyor 70 includes a pair of pulleys 80 and 82 and the endless belt 78 spanned between the pair of pulleys 80 and 82. Although not shown, for example, a motor as a belt driving unit is coupled to one of the pair of pulleys 80 and 82, for example, the pulley 80 on the downstream side. Upon receiving the driving force of the motor, one pulley coupled to the motor, the so-called driving pulley 80 rotates, and the endless belt 78 circulates between the driving pulley 80 and the other driven pulley 82. In other words, run. The carrier side of the endless belt 78 is slightly below the circumference path of the chain 36 (carrier-side travel path). The carrier side of the endless belt 78 travels at the same speed in the same direction as the carrier side of the chain 36 as described above. Further, the endless belt 78 is one more than the number of substantially L-shaped members (for example, the substantially L-shaped members forming the holding portion 54) so as not to interfere with the respective conveying claws 50 (particularly the holding portion 54). 7). Each of the pair of pulleys 80 and 82 is also configured to match the endless belt 78 (for example, a configuration in which the same number of pulleys as the endless belt 78 divided into a plurality of pieces are coaxially coupled).

  Each transport claw 50 transfers the object 100 held by itself as described above to the conveyor section 76 of the weighing conveyor 70 corresponding to itself (strictly speaking, the carrier side of the endless belt 78). At this time, the posture is changed around the base 52. In order to realize this, each conveyance claw 50 has a guide roller 58 as a guided portion. Specifically, one end of the shaft portion 56 of each conveyance claw 50 is in a state of protruding outward from the chain 36. An arm 60 is coupled to one end of the shaft portion 56 protruding outward from the chain 36. The arm 60 has the same shape as each of the substantially L-shaped members forming the holding portion 54, and is coupled to one end of the shaft portion 56 in a state of being connected to each other. Has been. A guide roller 58 is provided at an appropriate position away from a connecting portion (so-called base portion 52) of the arm 60 with one end of the shaft portion 56, for example, at a middle position of the extending portion of the arm 60. Yes. The guide roller 58 is provided so as to protrude outward from the arm 60, and its rotation shaft extends toward the outside of the arm 60, in other words, along the extending direction of the shaft portion 56. doing. Further, the guide claw 58 and the arm 60 are provided in directions opposite to each other in the transport claw 50 of the A group and the transport claw 50 of the B group. In other words, the guide claw 58 and the arm 60 are provided on one side (for example, the upper side in FIG. 2A) of the pair of chains 36 and 36 for the transport claw 50 of the A group. And about the conveyance claw 50 of B group, the guide roller 58 and the arm 60 are provided in the other side (lower side in Fig.2 (a)) of the said pair of chains 36 and 36. As shown in FIG.

  At the same time, the transfer is performed along the circulation path of the chain 36 over a predetermined section Eas (in particular, see FIG. 5A) including at least the measurement section Eg, and on both sides of the circulation path. For example, a pair of substantially elongated guide rails 90 and 92 as guide means are arranged. One of the pair of guide rails 90 and 92, for example, the guide rail 90 disposed on the side where the guide roller 58 and the arm 60 of the transport claw 50 of the A group are provided (upper side in FIG. 2A) , For controlling the posture of the transport claw 50 of the A group, and on the inner side thereof, as shown in FIG. 2C, a groove 90a into which the transport claw 50 of the A group is engaged. Is formed. The conveyance claw 50 of the A group changes its posture appropriately around the base 52 by traveling while engaging the guide roller 58 with the groove 90a. Specifically, the conveyance claw 50 of the A group is in a posture capable of reliably holding the object to be weighed 100 when receiving the supply of the object to be weighed 100 from the above-described supply device. In a so-called slanted position, the angle is directed diagonally upward. This inclined posture is maintained until a little before (upstream side) when the conveyance claw 50 of the A group reaches the arrangement position of the weighing conveyor 70 for the A group. And the conveyance claw 50 of the said A group gradually lowers the front-end | tip part of the holding | maintenance part 54, and when it is located in the upstream edge part of the conveyor part 76 of the weighing | measuring conveyor 70 for A groups, In other words, it is in a horizontal position with the tip portion oriented substantially horizontally. As a result, the object to be weighed 100 held by the conveyance claw 50 of the A group is transferred to the vicinity of the upstream end of the conveyor unit 76 (the carrier side of the endless belt 78) of the A group weighing conveyor 70. . The groove 90a is formed so that the posture of the transport claw 50 of the A group changes in this manner, that is, the guide roller 58 of the transport claw 50 of the A group is guided so as to be. That is, the groove 90a functions as a so-called groove cam, which is a guide for guiding the guide roller 58 of the conveyance claw 50 of the A group as a follower (cam follower).

  The other guide rail 92 (on the lower side in FIG. 2A) is for controlling the posture of the transport claw 50 of the B group, and the inner side surface thereof is shown in FIG. 2D. Thus, a groove 92a is formed in which the transport claw 50 of the B group is engaged. The transport claw 50 of the B group changes its posture in the same manner as the transport claw 50 of the A group by traveling with the guide roller 58 engaged with the groove 92a. That is, the conveyance claws 50 of the B group are inclined when receiving the object 100 from the supply device. This inclined posture is maintained until a little before the conveyance claw 50 of the B group reaches the arrangement position of the weighing conveyor 70 for the B group. And the conveyance nail | claw 50 of the said B group becomes a horizontal attitude | position in the position where the front-end | tip part of the holding | maintenance part 54 is lowered | hung gradually and located in the upstream edge part vicinity of the conveyor part 76 of the weighing conveyor 70 for B groups. As a result, the workpiece 100 held by the transport claw 50 of the B group is transferred to the vicinity of the upstream end of the conveyor unit 76 of the weighing conveyor 70 for the B group. The groove 92a is formed so as to guide the guide roller 58 of the transport claw 50 of the B group so that the posture of the transport claw 50 of the B group changes in this way. In short, the groove 92a also functions as a groove cam.

  Each weighing conveyor 70 measures the weight of the objects to be weighed 100 transferred to the conveyor unit 76 while being conveyed by the conveyor unit 76. Strictly speaking, the control device 20 described later, based on the load detection signals Wa and Wb obtained from the load cells 72 and 72 of the weighing conveyors 70 and 70, the conveyor units 76 and 70 of the weighing conveyors 70 and 70, respectively. The weights of the objects to be weighed 100 and 100 transferred to 76 are obtained. When the weight measurement of the objects 100 to be weighed by the respective weighing conveyors 70 is completed, in detail, when the objects 100 to be measured reach the vicinity of the downstream end of the conveyor unit 76, the objects to be weighed 100 are moved to the original conveyance claws. Re-transferred to 50. In other words, the object to be weighed 100 after the weight measurement by the A group weighing conveyor 70 is transferred again to the A group conveying claw 50 which has been conveyed to the A group weighing conveyor 70, that is, it is. Specifically, the groove 90a of the A group guide rail 90 is formed so that the transport claws 50 of the A group gradually transition from the horizontal posture to the inclined posture. In the same manner, the object to be weighed 100 after the weight measurement by the B group weighing conveyor 70 is transferred again to the transport claw 50 of the B group that has conveyed this to the weighing conveyor 70 for the B group, That is, in detail, the groove 92a of the B group guide rail 92 is formed so that the transport claw 50 of the B group gradually changes from the horizontal posture to the inclined posture.

  FIG. 3 schematically shows the operations of the respective conveying claws 50 and the operations of the respective weighing conveyors 70 in the predetermined section Eas including the measuring section Eg. As can be seen from FIG. 3, the weight measurement of the weighing object 100 belonging to the A group and the weight measurement of the weighing object 100 belonging to the B group are continuously performed independently and in parallel.

  Furthermore, the objects to be weighed 100 transferred to the respective conveying claws 50, that is, the objects to be weighed 100 after the weight measurement by the respective weighing conveyors 70, are conveyed downstream of the predetermined section Eas. On the downstream side of the predetermined section Eas, a selection section Ebs (see FIG. 5A) connected to the predetermined section Eas is provided. In the sorting section Ebs, more specifically, a plurality of sorting ports (not shown) corresponding to a plurality of weight ranks are slightly below the circulation path (carrier-side traveling path) of the chain 36 in the sorting section Ebs. It is provided in a line along 36 circulation paths. In addition, the sorting section Ebs is provided with a pair of guide gates with a sorting gate (not shown) as sorting control means connected to the guide rails 90 and 92 described above.

  One of the pair of guide rails with sorting gates is for controlling the posture of the conveyance claw 50 of the A group, and has a groove connected to the groove 90 a of the A group guide rail 90. A sorting gate is provided in the middle of the groove, specifically at a plurality of positions corresponding to each sorting port. Each sorting gate has a posture in which the transport claw 50 of the A group holds the object 100 according to the gate control signal Sag for the A group given from the control device 20 shown in FIG. It selectively operates so as to be in one of a posture in which the measurement object 100 is dropped downward, specifically, a downward posture in which the tip portion of the holding portion 54 is directed downward. When a certain transporting claw 50 of group A is in a downward posture by the operation of a certain sorting gate, the object 100 to be weighed held by the certain transporting claw 50 of the A group is dropped downward, and as a result It is put into the sorting port corresponding to the sorting gate.

  The other guide rail with a selection gate is for controlling the posture of the conveyance claw 50 of the B group, and has a groove connected to the groove 92a of the guide rail 92 for the B group. A plurality of sorting gates similar to those for the A group are provided in the middle of the groove. In accordance with the gate control signal Sbg for the B group given from the control device 20, each sorting gate is inclined so that the transport claw 50 of the B group holds the object to be weighed and downward to drop the object to be weighed 100 downward And selectively operate so as to be in any of the postures. In addition, when a certain conveyance claw 50 of a certain B group becomes a downward posture by the operation | movement of a certain sorting gate, the to-be-measured object 100 currently hold | maintained by a certain conveyance claw 50 of the said B group is dropped below, and by extension. It is put into a sorting port corresponding to the certain sorting gate.

  The control device 20 acquires the load detection signals Wa and Wb described above from the load cells 72 and 72 of the weighing conveyors 70 and 70 in order to generate the gate control signals Sag and Sbg. At the same time, the control device 20 acquires the rotation detection signal Sc from, for example, the rotary encoder 22 as the rotation detection means. The loop detection signal Sc is a signal representing the loop state of the chain 36. For example, the loop detection signal Sc that generates one pulse each time the chain 36 makes one turn, and the chain 36 has the conveying claws 50, 50, And a 1-pitch pulse signal that generates one pulse each time the vehicle travels by the mounting interval Ps. The rotary encoder 22 that generates the rotation detection signal Sc is coupled to a motor 38, for example.

  Then, based on the load detection signal Wa acquired from the load cell 72 of the weighing conveyor 70 for the A group, the control device 20 uses the weighing conveyor 70 (conveyor unit 76) for the A group to be detailed. The weight of the object 100 is obtained by, for example, averaging (moving averaging process) the load detection signal Wa obtained during the period in which the object is being conveyed. Then, based on the weight measurement result, it is determined which of the plurality of weight ranks the measurement object 100 belongs to. At the same time, the current position of the object to be weighed 100 is specified based on the rotation detection signal Sc from the rotary encoder 22, that is, the transport claw 50 of the A group that is transporting the object to be weighed 100 is specified. Then, a gate control signal Sag for the A group is generated so that the object to be weighed 100 (after the weight measurement) is input to the sorting port corresponding to the weight rank. Thereby, weight selection of the objects 100 belonging to the A group is realized.

  Similarly, based on the load detection signal Wb acquired from the load cell 72 of the B group weighing conveyor 70, the control device 20 is transported by the B group weighing conveyor 70 (conveyor unit 76). The weight of the weighing object 100 is obtained. And based on this weight measurement result, it is discriminate | determined to which weight rank the said to-be-measured object 100 belongs. Further, the current position of the object to be weighed 100 is obtained based on the rotation detection signal Sc from the rotary encoder 22, that is, the transport claw 50 of the B group that is transporting the object to be weighed 100 is specified. Then, the gate control signal Sbg for the B group is generated so that the object to be weighed 100 (after the weight measurement) is input to the sorting port corresponding to the weight rank. Thereby, weight selection of the objects 100 belonging to the B group is realized.

  In addition, although illustration is omitted, on the downstream side of the sorting section Ebs in the circulation path of the chain 36 or on the upstream side of the predetermined section Eas in the circulation path of the chain 36, cleaning for cleaning the respective conveying claws 50 is performed. A device is provided. Also, guide rails for appropriately controlling the postures of the respective transport claws 50 are provided in the sections other than the predetermined section Eas and the sorting section Ebs.

  By the way, in this embodiment, as shown in FIG. 4, the attachment interval Ps of each conveyance nail | claw 50,50, ... with respect to the chain 36, and the machine length Ls of each measurement conveyor 70 mutually have predetermined conditions mutually. More specifically, it is determined so as to satisfy the condition represented by the following Expression 8.

<< Formula 8 >>
Ls / 2 ≦ Ps <Ls

  The condition expressed by the equation 8 is also expressed by the following equation 9.

<< Formula 9 >>
Ps <Ls ≦ 2 · Ps

  And if the conveyance speed of the to-be-measured object 100 is Vs, processing capability Rs in this embodiment is represented by the following formula | equation 10 similar to the formula 1 in the above-mentioned prior art.

<< Formula 10 >>
Rs = Vs / Ps

  Further, the weighing time Ts by each weighing conveyor 70 is expressed by the following equation 11 similar to the equation 2 in the above-described prior art.

<< Formula 11 >>
Ts = Ls / Vs

  Note that the weighing time Ts represented by the equation 11 correlates with the weighing accuracy by the weighing conveyor 70 in the same manner as the weighing time Tz in the related art represented by the equation 2. That is, the longer the weighing time Ts, the higher the weighing accuracy by the weighing conveyor 70, and the shorter the weighing time Ts, the lower the weighing accuracy by the weighing conveyor 70a.

  Here, for example, it is assumed that the machine length Ls of the weighing conveyor 70 is equivalent (Ls = Lz) to the machine length Lz of the weighing conveyor in the prior art described above. Then, it is assumed that the conveyance speed Vs of the object to be weighed 100 is also equivalent (Vs = Vz) to the object conveyance speed Vz in the related art. Then, the measurement time Ts represented by Expression 11 is equivalent to the measurement time Tz in the conventional technique represented by Expression 2 described above (Ts = Tz). In short, the weighing accuracy is equivalent to that in the prior art.

  On the other hand, as can be seen from Equations 8 and 9, the attachment interval Ps of the conveying claws 50, 50,... To the chain 36 is at least smaller than the machine length Ls of the weighing conveyor 70 (Ps <Ls). It is smaller than the attachment interval Pz of the conveyance claw (Ps <Pz). From this, the processing capability Rs represented by Formula 10 is higher than the processing capability Rz in the related art represented by Formula 1 (or Formula 3) described above (Rs> Rz).

  That is, according to this configuration (that is, a configuration in which Ls = Lz and Vs = Vz), the measurement accuracy equivalent to that of the conventional technology is maintained, in other words, without sacrificing the measurement accuracy, compared to the conventional technology. High processing capability Rs can be obtained, that is, the processing capability Rs can be improved. In particular, when the attachment interval Ps of the conveying claws 50, 50,... With respect to the chain 36 is the minimum (Ps = Ls / 2), the processing capacity Rs is twice the processing capacity Rz (Rs = 2 · Rz).

  In addition, when the attachment interval Ps of the conveyance claws 50, 50,... To the chain 36 is minimum (Ps = Ls / 2), for example, the conveyance speed Vs of the object 100 is the conveyance speed Vz in the prior art. Is assumed to be 1/2 (Vs = Vz / 2). Then, the processing capability Rs is equivalent to the processing capability Rz in the prior art (Rs = Rz). On the other hand, the weighing time Ts is twice the weighing time Tz in the prior art (Ts = 2 · Tz), and the weighing accuracy is improved accordingly. That is, according to this configuration (that is, a configuration in which Ls = Lz and Ps = Ls / 2 and Vs = Vz / 2), the processing capability Rs equivalent to the processing capability Rz in the prior art is maintained, so to speak It is possible to improve the measurement accuracy without sacrificing the capability Rs.

  Further, depending on the setting of the attachment interval Ps of each conveyance claw 50, 50,... To the chain 36 and the conveyance speed Vs of each object 100, 100,..., Both processing capacity Rs and measurement accuracy (measurement time Ts) are determined. It can be improved at the same time. For example, it is assumed that the attachment interval Ps of the conveying claws 50, 50,... With respect to the chain 36 is 2/3 of the machine length Ls of the weighing conveyor 70 (Ps = {2/3} · Ls). In addition, it is assumed that the conveyance speed Vs of each of the objects to be weighed 100, 100,... Is 3/4 of the conveyance speed Vz in the prior art (Vs = {3/4} · Vz). Then, the processing capability Rs becomes 9/8 times (Rs = {9/8} · Rz) of the processing capability Rz in the prior art, in other words, increases by 12.5%. The measuring time Ts is 4/3 times the measuring time Tz in the prior art (Ts = {4/3} · Tz), that is, increases by 30%, and the measuring accuracy is improved accordingly. Thus, according to the present embodiment, both the processing capability Rs and the measurement accuracy (measurement time Ts) can be improved at the same time.

  It should be noted that the machine length Ls of each weighing conveyor 70 may be set as appropriate instead of or in addition to the attachment interval Ps of the conveying claws 50, 50,. In any case, by satisfying the condition represented by the above-described Expression 8 or 9, it is possible to appropriately improve these without sacrificing both the processing capability Rs and the measurement accuracy.

  Further, according to the present embodiment, it is possible to shorten the length of the weight sorter 10 as a whole. That is, generally, for example, as shown in FIG. 5A, from the installation position of the supply device described above to the upstream end of the weighing section Eg (upstream end of the upstream (for A group) weighing conveyor 70). A distance Las that is greater than a certain distance is provided between them. This is to ensure that the object to be weighed is transferred to the conveyor unit 76 of the group A weighing conveyor 70 after the object to be weighed 100 is supplied to the conveying claw 50 of the A group by the supply device. In other words, the pre-weighing preparation distance Las is equivalent to, for example, the attachment interval Ps of the conveying claws 50, 50,... With respect to the chain 36 (Las = Ps). Further, a distance Lbs of a certain distance or more is also present between the downstream end of the weighing section Eg (the downstream end of the downstream (for the B group) weighing conveyor 70) and the upstream end of the sorting section Ebs. Is provided. This is because, in particular, the object 100 to be weighed after the weight measurement by the B group weighing conveyor 70 is reliably transferred (held) to the original B group conveying claws 50, and then again by the B group conveying claws 50. This is to ensure that the object to be weighed 100 held by the conveying claw 50 of the B group in the sorting section Ebs is surely put into any (especially most upstream) sorting port. In other words, the pre-selection preparation distance Lbs is also equivalent (Lbs = Ps) to the attachment interval Ps of the conveying claws 50, 50,. The pre-measurement preparation distance Las, the measurement section Eg, and the pre-sort preparation distance Lbs are combined to form a predetermined section Eas. Then, the predetermined section Eas (length dimension thereof) is expressed by the following Expression 12.

<< Formula 12 >>
Eas = Cas + Eg + Cbs≈2 · Ps + 2 · Ls

  On the other hand, in the sorting section Ebs, as described above, a plurality of, for example, X (X: integer greater than or equal to 2) sorting ports are provided. The distance (pitch) between the respective sorting openings is determined in accordance with the attachment interval Ps of the conveying claws 50, 50,... With respect to the chain 36, for example, α times (= α · Ps) of the attachment interval Ps. The Note that the value of α referred to here is appropriately determined according to the mode (type) of the object 100 to be weighed. For example, when the object 100 is a saury, α = about 4/3. And when the to-be-measured object 100 is mackerel, it is set to about α = 5/4. Then, the sorting section Ebs (the length dimension thereof) is expressed by the following Expression 13.

<< Formula 13 >>
Ebs = {X−1} · α · Ps

  Furthermore, the effective section Ds (the length dimension) of the selected section Ebs and the above-described predetermined section Eas is expressed by the following Expression 14.

<< Formula 14 >>
Ds = Eas + Ebs≈2 · Ps + 2 · Ls + {X−1} · α · Ps

  Here, for example, it is assumed that the machine length Ls of the weighing conveyor 70 is equivalent (Ls = Lz) to the machine length Lz of the weighing conveyor in the prior art described above. And the attachment space | interval Ps of each conveyance nail | claw 50,50, ... with respect to the chain 36 shall be the minimum (Ps = Ls / 2 = Lz / 2). Further, it is assumed that the total number X of sorting ports is X = 10. In addition, it is assumed that the value of α described above is α = 4/3. Then, the effective interval Ds represented by the equation 14 is expressed by the following equation 15. The captain of the entire weight sorter 10 including the effective section Ds has a scale corresponding to the effective section Ds.

<< Formula 15 >>
Ds≈2 · {Lz / 2} + 2 · Lz + {10−1} · {4/3} · {Lz / 2} = 9 · Lz

  On the other hand, in the above-described prior art, for example, as shown in FIG. 5B, a pre-measurement preparation distance Laz that is greater than or equal to a certain distance is provided between the supply device installation position and the upstream end of the measurement conveyor. Provided. The pre-weighing preparation distance Laz is, for example, equivalent to the attachment interval Pz of each conveyance claw with respect to the chain band (Laz = Pz). Further, a pre-sorting preparatory distance Lbz is provided between the downstream end of the weighing conveyor and the upstream end of the discharge chute train. The pre-sorting preparation distance Lbz is also equivalent (Lbz = Pz) to the attachment interval Pz of each conveyance claw with respect to the chain band. Further, the distance between the discharge chutes is set to the above-mentioned α times (= α · Pz) of the attachment interval Pz of each conveyance claw with respect to the chain band. Then, the effective section Dz (the length dimension thereof) from the installation position of the supply device to the downstream end of the discharge chute train is expressed by the following Expression 16. Note that X ′ in Equation 16 is the total number of discharge chutes.

<< Formula 16 >>
Dz = Laz + Lz + Lbz + {X′−1} · α · Pz = 2 · Pz + Lz + {X′−1} · α · Pz

  Here, for example, it is assumed that the attachment interval Pz of each conveyance claw with respect to the chain band is the minimum (Pz = Lz). The total number X ′ of discharge chutes is assumed to be X ′ = 10, which is the same as the total number X of sorting ports in the present embodiment. Furthermore, the value of α is also assumed to be α = 4/3 equivalent to that in the present embodiment. Then, the effective interval Dz expressed by the equation 16 is expressed by the following equation 17. The captain of the entire weight sorter including the effective section Dz has a scale corresponding to the effective section Dz.

<Equation 17>
Dz = 2 · Lz + Lz + {10-1} · {4/3} · Lz = 15 · Lz

  It can be seen from a comparison between the effective interval Dz (Dz = 15 · Lz) in the prior art expressed by the equation 17 and the effective interval Ds (Ds = 9 · Lz) in the present embodiment expressed by the above equation 15. As described above, according to the present embodiment, the effective section Ds can be shortened, and thus the overall length of the weight sorter 10 including the effective section Ds can be shortened. This becomes more prominent as the total number X of sorting ports increases.

  In the present embodiment, the pair of guide rails 90 and 92 are employed as the transfer guide means, but the present invention is not limited to this. For example, instead of the pair of guide rails 90 and 92, a guide rail 190 with a switching gate as shown in FIG. 6 may be employed. The guide rail 190 with a switching gate has a groove 190a that is a combination of the grooves 90a and 92a of the pair of guide rails 90 and 92. Appropriate switching gates 190b, 190c and 190d are provided at each branch point in the middle of the groove 190a. These switching gates 190b, 190c and 190d are controlled by the control device 20 described above, and strictly operate according to a switching gate control signal given from the control device 20. In addition, this guide rail 190 with a switching gate is installed in the position where one of the pair of guide rails 90 and 92, for example, the guide rail 90 for group A was installed. In accordance with this, the guide roller 58 and the arm 60 are provided on the side where the guide rail 190 with the switching gate is installed for all the conveyance claws 50, 50,.

  According to the configuration in which the guide rail 190 with the switching gate is adopted, when the transport claw 50 of the A group travels, the switching gates 190b, 190c, and 190d operate as shown in FIG. 6B. Accordingly, the conveyance claw 50 of the A group takes the same posture as described above (that is, the configuration in which the A group guide rail 90 is adopted). When the transport claw 50 of the B group travels, the switching gates 190b, 190c and 190d operate as shown in FIG. 6B, so that the transport claw 50 of the B group has been described above. (That is, the configuration in which the B group guide rail 92 is adopted) takes the same posture. Therefore, the same operation and effect as described above can be obtained by the configuration in which the guide rail 190 with the switching gate is employed.

  However, in the configuration in which the guide rail 190 with the switching gate is adopted, the switching gates 190b, 190c and 190d and means for controlling them are required, and accordingly, the configuration becomes complicated, and Increase costs. Also in the sorting section Ebs, instead of the pair of guide rails with sorting gates described above, common to all the conveying claws 50, 50,... For controlling the postures of all the conveying claws 50, 50,. Guide rails with sorting gates need to be adopted. In this case, depending on the mounting interval Ps of the transport claws 50, 50,... And the distance α · Ps between the sorting ports (in other words, the value of α), the operations of the sorting gates may not be in time. In view of these, the configuration in which the above-described pair of guide rails 90 and 92 and the pair of guide rails with a selection gate are employed is more convenient.

  In the present embodiment, the posture of each conveyance claw 50 is controlled using a so-called cam mechanism including the pair of guide rails 90 and 92 described above. You may control the attitude | position of the said each conveyance nail | claw 50. FIG. In addition, a configuration may be employed in which each transport claw 50 is provided with appropriate drive means such as a motor, and the respective transport claws 50 themselves control the posture by this drive means.

  Further, the two weighing conveyors 70 and 70 are arranged so that the conveyor portions 76 and 76 are as close as possible to each other, but the invention is not limited thereto. In other words, the weighing conveyors 70 and 70 may be disposed relatively apart from each other without the conveyor portions 76 and 76 being close to each other. However, it is variously convenient that the weighing conveyors 70 and 70 are arranged close to each other in terms of management and maintenance of the weighing conveyors 70 and 70.

  In addition, the value of N described above is not limited to 2, and may be 3 or more.

  And in this embodiment, although the case where this invention was applied to the weight sorter 10 was demonstrated, it is not restricted to this. For example, the present invention may be applied to a weighing device having a configuration that does not have the sorting section Ebs described above.

  In any case, the contents described in the present embodiment are specific examples for realizing the present invention, and do not limit the scope of the present invention. The present invention may be realized by a configuration other than the contents described in the present embodiment.

10 Weight sorter 30 Endless conveyor 36 Chain 50 Transport claw 70 Weighing conveyor

Claims (5)

An endless conveyor having an endless rotating body that travels at a predetermined speed along a circular path passing through a predetermined weighing section;
Attached to the endless rotating body at regular intervals along the traveling direction of the endless rotating body, the object to be weighed is supplied, and the supplied object to be weighed travels according to the endless rotating body. A plurality of conveying means for conveying by;
N (N: an integer greater than or equal to 2) units for measuring a load applied through the conveyance path and having a conveyance path provided in series with each other along the circulation path in the measurement section A weighing conveyor;
Comprising
Each of the transport paths of the N weighing conveyors travels in the same direction as the traveling direction of the endless circular body in the weighing section at the same speed as the traveling speed of the endless circular body,
The plurality of conveying means are grouped into a plurality of the groups, each including N consecutive groups.
For each of the groups divided into the plurality of groups, the N conveying means are associated with the N weighing conveyors in a one-to-one relationship,
The fixed interval is 1 / N or more of the length dimension of the transport path and smaller than the length dimension of the transport path,
In the weighing section, each of the plurality of transport means transfers the plurality of objects being transported to the transport path of the weighing conveyor associated with the one-to-one relationship. A transfer control means for controlling each of the transport means;
Weighing device. Each of the plurality of conveying means has a shape capable of holding the object to be measured and has a conveyance claw attached to the endless revolving body so as to be rotatable, and the endless revolving body of the conveyance claw The guided portion is provided at a position away from the base that is the mounting portion for
The transfer control means is provided so as to be along the circulation path over a predetermined section including at least the measurement section, and each of the plurality of transport means when each of the plurality of transport means travels in the predetermined section. By guiding the guided portion, the transfer of the object to be weighed onto the conveying path of the weighing conveyor associated with the one-to-one relationship by each of the plurality of conveying means in the weighing section is realized. Having transfer guide means;
The weighing device according to claim 1 . The value of N is 2,
For each of the groups, the two conveying means as the N conveying means are associated with the two weighing conveyors as the N weighing conveyors in the one-to-one relationship,
The transfer guide means includes first guide means and second guide means provided on both sides of the circuit path with the circuit path in the predetermined section in between.
The first guiding means guides the guided portion of one of the two conveying means for each of the sets,
The second guide means guides the other guided part of the two transport means for each of the groups.
The weighing device according to claim 2 . A weighing device according to any of claims 1 to 3 ,
Sorting means for sorting the objects to be weighed after being measured by each of the N weighing conveyors according to a plurality of weight ranks based on the measurement results of the weights of the objects to be weighed;
A weight sorter comprising: The sorting means is provided in a row along the circulation path in the sorting section on the downstream side of the measurement section in the circulation path, and a plurality of selection ports corresponding to the plurality of weight ranks, Each of the conveying means conveys the object to be weighed after the weight is measured by each of the N weighing conveyors to the sorting section, and the measurement result of the weight of the object to be weighed in the sorting section. Sorting control means for controlling each of the plurality of transport means so as to selectively put the objects to be weighed into the plurality of sorting ports based on
The weight sorter according to claim 4 .

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