JP2010096590A - Combination balance - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a combination balance detecting stay of weighing objects on a feeder pan, and taking a proper measure. <P>SOLUTION: This balance includes: a top cone 1 for distributing in the radial direction the weighing objects M supplied onto the top surface; a deposit amount detection means 3 for detecting the deposit amount of the weighing objects on the top cone; a plurality of feeder pans 4 for receiving the weighing objects distributed around the top cone; a linear feeder 5 for conveying the weighing objects by vibrating the feeder pans; a plurality of weighing hoppers 7 disposed under each feeder pan; a weighing part 8 for weighing respectively the weight of each received weighing object; and an operation control part 11 for controlling each part. When detecting by the deposit amount detection means that the deposit amount of the weighing objects is over a prescribed amount, and detecting by the weighing part that at least one of the weighing hoppers holds the weighing objects below a prescribed weight once or a plurality of times continuously, the control part determines that the weighing objects stay on a feeder pan corresponding to the weighing hopper. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a combination weigher that combines a subdivided object to be weighed into a predetermined weight object, and more particularly to a combination weigher that is effective when the object to be weighed is relatively high.

  A general combination weigher includes a feeder pan for supplying an object to be weighed to a weighing hopper. The feeder pan vibrates, and thereby the object to be weighed on the upper surface can be conveyed in a certain direction. The combination weigher can also weigh the weighing object with stickiness, but in this case, the weighing object is easily caught on the upper surface of the feeder pan, and the same conditions as for the weighing object without stickiness When the feeder pan is vibrated, the transport amount is reduced as compared with a non-sticky object to be weighed.

In view of this, a combination weigher having a configuration in which the vibration of the feeder pan is strengthened when the amount of conveyance by the feeder pan is small, that is, when the weight of an object entering the weighing hopper is small has been proposed (for example, patents). Reference 1). According to such a configuration, even when an object to be weighed having an adhesive property is conveyed, an appropriate amount of the object to be weighed can be conveyed to the weighing hopper within a predetermined time.
JP-A-55-33649

  On the other hand, even if an object to be weighed has the same adhesiveness, an object to be weighed with higher tackiness, such as gummy, may stick to the feeder pan completely if it remains on the feeder pan for a while. In this case, the object to be weighed stays on the feeder pan and the supply amount of the object to be weighed to the weighing hopper is extremely reduced, but the conventional combination weigher described above cannot cope with such a situation. . For example, even if the strength of vibration of the feeder pan is increased and sticking of the object to be weighed to the feeder pan is resolved, the high vibration strength is maintained instead of returning to the original vibration condition. When vibrating, a large amount of objects to be weighed are supplied to the weighing hopper and an error occurs.

  The present invention has been made to solve the above-described problem, and an object of the present invention is to provide a combination weigher capable of detecting when an object to be weighed stays in a feeder pan and performing appropriate measures. .

  In order to solve the above-described problems, a combination weigher according to the present invention detects a top cone that distributes an object to be weighed supplied on an upper surface in a radial direction, and an accumulation amount of the object to be weighed deposited on the upper surface of the top cone. Depositing amount detecting means, a plurality of feeder pans arranged around the top cone and receiving the object to be weighed distributed from the top cone, the feeder pan being vibrated under a conveyance vibration condition, and the feeder A linear feeder that transports the object to be weighed on the pan radially outward; and a plurality of linear feeders that are disposed below each of the feeder pans and receive the object to be weighed directly or indirectly from the feeder pan. A weighing hopper, a weighing unit for weighing the objects to be weighed received by the weighing hoppers, the accumulation amount detecting means, the linear feeder, A quantity hopper, and a calculation control unit for controlling the weighing unit, wherein the calculation control unit has at least a predetermined amount of accumulation of the object to be weighed deposited on the top surface of the top cone by the accumulation amount detecting means. If it is detected that one or more of the weighing hoppers hold an object to be weighed below a predetermined weight one or more times, the weighing hopper It is determined that the object to be weighed stays in the feeder pan corresponding to.

  According to this configuration, there is a phenomenon in which the weighing object is not sufficiently supplied to the weighing hopper even though the weighing object is sufficiently supplied to the top cone generated when the weighing object stays in the feeder pan. Since it can detect, it can determine correctly that the to-be-measured item is staying in a feeder pan. The “conveyance vibration condition” according to the present invention refers to a condition of vibration of the linear feeder during normal operation, and includes, for example, vibration intensity and vibration time.

  In addition, the combination weigher according to the present invention includes a top cone that distributes the object to be weighed supplied to the upper surface in a radial direction, and a deposition amount detecting means for detecting the accumulation amount of the object to be weighed deposited on the upper surface of the top cone. A plurality of feeder pans disposed around the top cone and receiving the object to be weighed distributed from the top cone; and the feeder pan is vibrated under a conveying vibration condition to cause the target pan on the feeder pan to be vibrated. A linear feeder that conveys a weighing object radially outward; a plurality of weighing hoppers that are disposed below each of the feeder pans and that receive the objects to be weighed directly or indirectly from the feeder pan; and A weighing unit for weighing each of the objects to be weighed received by each weighing hopper, the accumulation amount detecting means, the linear feeder, the weighing hopper, and A calculation control unit for controlling the weighing unit, wherein the calculation control unit has at least a predetermined amount or more of the accumulation amount of the object to be accumulated on the top surface of the top cone by the accumulation amount detection means. And when the weighing unit detects that one or more times the weighing hopper holds an object to be weighed below a predetermined weight one or more times, the weighing hopper corresponds to the weighing hopper. You may make it perform the stay cancellation | release process for canceling the stay of the said to-be-measured item in a feeder pan.

  Further, in the combination weigher, when the calculation control unit determines that the object to be weighed stays in any of the feeder pans, the feeder pan is temporarily moved by the linear feeder under the first vibration condition. You may make it vibrate. According to such a configuration, the object to be weighed attached to the feeder pan can be peeled off and returned to a normal state by applying temporary vibration to the feeder pan.

  In the combination weigher described above, the first vibration condition may be different from the conveyance vibration condition. According to such a configuration, vibration different from the vibration of the conveyance vibration condition is applied to the feeder pan, so that retention of the object to be weighed on the feeder pan is more easily eliminated.

  The combination weigher may further include a main feeder that is controlled by the calculation control unit and vibrates the top cone, and the calculation control unit causes the feeder pan to vibrate temporarily by the linear feeder. The top cone may be vibrated by the main feeder in synchronization with this vibration. According to such a configuration, not only the force due to the vibration of the feeder pan but also the object to be weighed attached to the feeder pan can be more easily peeled off by the pressing force of the portion to be weighed sent from the main feeder.

  In the above combination weigher, the arithmetic control unit may vibrate when the weighing hopper corresponding to the feeder pan further measures a predetermined weight or less after vibrating the feeder pan under the first vibration condition. It may be determined that the stay in the feeder pan is not eliminated. According to this configuration, when the object to be weighed is not eliminated from the feeder pan even by vibration under the first vibration condition, this can be detected and appropriate action to be taken next can be performed.

  In the combination weigher, the arithmetic control unit may issue an alarm when it is determined that the stay is not eliminated in any of the feeder pans. “Issuing an alarm” here refers to appealing to the visual and auditory sense of the worker that the state is different from normal. According to such a configuration, the operator can recognize this when the object to be weighed does not peel from the feeder pan due to vibration under the first vibration condition.

  Further, in the combination weigher, when the calculation control unit determines that the stay is not eliminated in any of the feeder pans, the arithmetic feeder further moves the linear feeder under a second vibration condition different from the first vibration condition. You may make it vibrate temporarily. According to such a configuration, vibration is performed again under a second vibration condition different from the first vibration condition. For example, the strength of vibration is not increased from the beginning, so that when the object to be weighed is peeled off from the feeder pan (feed hopper) ) Can be prevented from becoming too large.

  According to the present invention, when an object to be weighed stays in the feeder pan, this can be detected, and appropriate measures can be taken.

  Hereinafter, embodiments according to the present invention will be described with reference to the drawings. Below, the same code | symbol is attached | subjected to the element which is the same or it corresponds through all the drawings, and the overlapping description is abbreviate | omitted.

  First, with reference to FIG. 1, the structure of the combination scale 100 which concerns on embodiment of this invention is demonstrated. FIG. 1 is a schematic configuration diagram of a combination weigher 100 according to the embodiment. In addition, the black circle in a figure represents the to-be-measured item M. As shown in FIG. 1, the combination weigher 100 according to this embodiment includes a top cone 1, a main feeder 2, a deposition amount detection means 3, a feeder pan 4, a linear feeder 5, a supply hopper 6, and a weighing The hopper 7, the weighing unit 8, the collective chute 9, the operation setting display unit 10, and the calculation control unit 11 are mainly configured. Hereafter, each structure is demonstrated in order.

  The top cone 1 is disposed at the top of the combination weigher 100 and has a conical shape. Usually, a supply device 200 for supplying an object to be weighed is arranged above the combination weigher 100, and the portion to be weighed M is supplied from the supply device 200 to the upper surface of the top cone 1. Since the top cone 1 has a conical shape, the objects to be weighed M supplied to the upper surface thereof are distributed in the radial direction.

  The main feeder 2 is disposed below the top cone 1 and has a function of vibrating the top cone 1. The main feeder 2 vibrates the top cone 1 so that the objects to be weighed M supplied to the upper surface of the top cone 1 can be evenly distributed in each direction. The vibration of the main feeder 2 is controlled by the arithmetic control unit 11.

  The accumulation amount detection means 3 has a function of detecting the accumulation amount of the object M to be accumulated on the upper surface of the top cone 1. The accumulation amount detection means 3 according to the present embodiment is a level sensor using infrared light. Specifically, the accumulation amount detection means 3 includes a projector 3a that transmits infrared light, and a light receiver 3b that receives the infrared light disposed to face the projector 3a. The light projector 3a and the light receiver 3b are arranged so that infrared light passes above the top of the top cone 1, and when an object M to be weighed is deposited on the upper surface of the top cone 1 by a predetermined amount or more. Infrared light will be blocked. A signal as to whether or not the light receiver 3b has received infrared light is transmitted to the calculation control unit 11, and the calculation control unit 11 has an object to be weighed on the top surface of the top cone 1 when the light receiver 3b has not received infrared light. It is determined (detected) that M has accumulated a predetermined amount or more. On the contrary, when the light receiver 3b receives infrared light, it is determined (detected) that the object to be weighed M is not deposited on the upper surface of the top cone 1 in a predetermined amount or more.

  The feeder pan 4 has a function of receiving an object to be weighed M distributed from the top cone 1. The feeder pan 4 is disposed around the top cone 1 and extends outward from the vicinity of the outer periphery of the top cone 1 in the radial direction. If the weighing object M having adhesiveness stays on the upper surface of the feeder pan 4 for a long time, the weighing object M may stick to the feeder pan 4. In FIG. 1, the feeder pans 4 are shown on the left and right sides of the paper surface. However, in reality, a plurality of feeder pans 4 are arranged radially over the entire circumference of the combination weigher 100 (this point includes the linear feeder 5, the supply The same applies to the hopper 6, the weighing hopper 7, and the weighing unit 8.)

  The linear feeder 5 is disposed below the feeder pan 4 and has a function of vibrating the feeder pan 4. As the linear feeder 5 vibrates, the object M on the feeder pan 4 can be conveyed radially outward. The vibration of the linear feeder 5 is controlled by the arithmetic control unit 11, and the arithmetic control unit 11 can vibrate each linear feeder 5 individually.

  The supply hopper 6 is disposed below (lower stage) so as to correspond to each feeder pan 4. The supply hopper 6 is configured to open and close at the bottom, and receives the object M from the feeder pan 4 with the bottom closed. Normally, when the corresponding weighing hopper 7 becomes empty, the supply hopper 6 opens the bottom and supplies the object to be weighed M to the weighing hopper 7. Opening and closing of the bottom of the supply hopper 6 is controlled by the arithmetic control unit 11.

  The weighing hopper 7 is arranged below the supply hopper 6 so as to correspond to each supply hopper 6. The weighing hopper 7 is configured to open and close at the bottom, and receives the object M from the supply hopper 6 with the bottom closed. Opening and closing of the bottom of the weighing hopper 7 is controlled by the arithmetic control unit 11.

  The weighing unit 8 is disposed inside the combination weigher 100 and has a function of weighing the weight of the object M held by the weighing hopper 7. The weighing unit 8 includes a load cell, and the weight of the object to be weighed M is calculated (measured) based on an electric signal from the load cell. In the present embodiment, the electric signal from the load cell is sent to the calculation control unit 11, and the calculation control unit 11 calculates the weight of the object to be weighed M. The weight of the measurement object M is calculated inside the measurement unit 8. Then, the signal may be transmitted to the arithmetic control unit 11.

  The collecting chute 9 has a function of collecting the objects to be weighed M received from the weighing hopper 7 and discharging them to the packaging machine 300 disposed below the combination weigher 100. The collective chute 9 covers all the weighing hoppers 7 and is disposed below them so that the objects M to be weighed discharged from the weighing hoppers 7 can be received. The packaging machine 300 is a device that wraps the received object to be weighed M in a packaging bag or the like.

  The operation setting display unit 10 is an interface that connects the combination weigher 100 and an operator, and can set operating conditions of the combination weigher 100 and has a function of displaying a measurement result and the like. The operation setting display unit 10 can exchange signals with the arithmetic control unit 11 wirelessly or by wire. The operation setting display unit 10 according to the present embodiment employs a touch panel and has a speaker inside.

  The arithmetic control unit 11 includes a CPU and the like, and controls the main feeder 2, the accumulation amount detection unit 3, the linear feeder 5, the supply hopper 6, the weighing hopper 7, and the weighing unit 8 based on the operation of the operation setting display unit 10. It has a function to do. Further, the combination calculation is performed by the calculation control unit 11. The above is the schematic configuration of the combination weigher 100 according to the present embodiment.

  Next, the basic operation of the combination weigher 100 will be described with reference to FIG. FIG. 2 is a flowchart showing one weighing cycle of the combination weigher 100. This operation is performed under the control of the arithmetic control unit 11. Here, the description starts from a state in which the supply hopper 6 and the weighing hopper 7 hold the object to be weighed M as shown in FIG. In addition, it is assumed that the object to be weighed M does not stick to the feeder pan 4, and about 20 grams of the object to be weighed M is supplied from the feeder pan 4 to each supply hopper 6 (each weighing hopper 7).

  First, the calculation control unit 11 acquires a signal from the weighing unit 8, and calculates (acquires) an accurate weight value of the object M held by each weighing hopper 7 based on this signal (step S21). Then, a combination calculation is performed based on the acquired weight value (step S22). For example, when 60 grams of an object to be weighed M is to be packaged, three weighing hoppers 7 (for example, 19 grams, 19 grams, and 22 grams, respectively) in which the total weight of the objects to be weighed M is 60 grams. The three weighing hoppers 7) having the objects to be weighed M are selected. Thereafter, the bottom of the selected weighing hopper 7 is opened (step S23), and the objects to be weighed M are discharged to the collecting chute 9. As described above, the objects to be weighed M discharged to the collecting chute 9 are packaged by the packaging machine 300. As a result, a product in which 60 grams of the object to be weighed M is packed is completed.

  Thereafter, the bottom of the weighing hopper 7 from which the object to be weighed M is discharged is closed (step S24), and in this state, the bottom of the supply hopper 6 corresponding to the weighing hopper 7 is opened (step S25). As a result, the object to be weighed M is supplied to the weighing hopper 7 which has become empty. Subsequently, the bottom of the supply hopper 6 with the bottom opened is closed (step S26), and the feeder pan 4 (linear feeder 5) corresponding to the supply hopper 6 is subjected to vibration conditions during normal conveyance (hereinafter referred to as “conveyance vibration condition”). ”(Step S27). Thereby, the object M to be weighed on the feeder pan 4 is supplied to the empty supply hopper 6. In the conveyance vibration condition according to the present embodiment, the strength is about 50% of the maximum strength, and the operation time is 200 ms. The state of FIG. 1 is restored through the above operation. The above is one weighing cycle by the combination scale 100.

  As is apparent from the above description, not all the feeder pans 4 vibrate at regular intervals, but only the feeder pans 4 corresponding to the weighing hoppers 7 selected by the combination calculation vibrate. Therefore, when there is a weighing hopper 7 that is not selected for a long time, the feeder pan 4 corresponding to the weighing hopper 7 continues to be stopped, and if the object to be weighed M has high adhesiveness, the object to be weighed M is stuck on the feeder pan 4. It will stick. If the object to be weighed M sticks to the feeder pan 4, the amount of the object to be weighed M by the feeder pan 4 is extremely reduced, and in some cases, the object to be weighed M cannot be transported at all. That is, the object to be weighed M stays on the feeder pan 4.

  Next, with reference to FIG. 3, the determination method of whether the to-be-measured item M is staying on the feeder bread | pan 4 is demonstrated. FIG. 3 is a flowchart until it is determined whether or not the object to be weighed M stays on the feeder pan 4. This operation is performed under the control of the arithmetic control unit 11.

  First, the calculation control part 11 acquires the weight of the to-be-measured object M which each weighing hopper 7 hold | maintains (step S31). Specifically, a signal from each weighing unit 8 is acquired, and the weight of the weighing object M of each weighing hopper 7 is calculated based on this signal. Subsequently, based on the weight of the object to be weighed M acquired in step S31, it is detected whether or not there is a weighing hopper 7 in which the weight of the object to be weighed M to be held is equal to or less than a predetermined weight (step S32). For example, where the weight (divided weight) of the weighing object M held by each weighing hopper 7 should be about 20 grams originally, the weight (measured weight) of the weighing object M held is 5 grams, It is determined whether or not there is a weighing hopper 7 that holds an object to be weighed whose weighing weight is clearly smaller than the original divided weight. If it is detected that there is such a weighing hopper 7 (YES in step S32), the process proceeds to step S33, and if it is not detected (NO in step S32), the object to be weighed M stays on the feeder pan 4. Exit as if not.

  When it is detected that there is a weighing hopper 7 in which the weight of the object M to be held is equal to or less than the predetermined weight (YES in step S32), the bottom of the supply hopper 6 corresponding to the weighing hopper 7 is opened (step S33). ). As a result, when the weighing object M is present in the supply hopper 6, the weighing object M is discharged to the weighing hopper 7. The timing for opening the bottom of the supply hopper 6 may be the same as the timing for opening the bottom of the other supply hopper 6 (step S25 in FIG. 2) or may be completely different.

  Thereafter, the weighing object M received from the supply hopper 6 is also combined to obtain the weight of the weighing object M held by the weighing hopper 7 (step S34). The reason why the weight is acquired again is to confirm whether or not the corresponding supply hopper 6 has a small amount of the object M to be weighed. And it is determined whether the weight of the to-be-measured object M acquired at step S34 is below predetermined weight (step S35), and when it determines with it being below predetermined weight (it is YES at step S35), it progresses to step S36. . On the other hand, if it is determined that the weight is not less than the predetermined weight (NO in step S35), the weighing object M is not staying on the feeder pan 4 and the bottom of the supply hopper 6 is closed (step S37) and the process is terminated.

  Note that the reference weight (predetermined weight) in step S35 may be the same as the reference weight (predetermined weight) in step S32, but the object to be weighed M is the supply hopper 6 and the weighing hopper. In consideration of the fact that the object to be weighed 7 is combined, the weight that is twice the reference weight (predetermined weight) in step S32 may be used as the reference weight. The weight obtained by adding a constant weight to the weight of M may be used as the reference weight.

  When it is determined that the weight of the object M acquired in step S34 is equal to or less than the predetermined weight (YES in step S35), the accumulation amount of the object M deposited on the upper surface of the top cone 1 by the accumulation amount detection unit 3 Is detected to be greater than or equal to a predetermined amount (step S36). The reason why it is detected whether or not the accumulation amount of the weighing object M deposited on the upper surface of the top cone 1 is a predetermined amount or more is that the weighing object M held by the weighing hopper 7 and the supply hopper 6 is small. This is simply to confirm whether or not this is due to a small supply amount of the object to be weighed M from the supply device 200.

  When it is detected that the accumulation amount of the weighing object M deposited on the upper surface of the top cone 1 is a predetermined amount or more (YES in step S36), there is a feeder pan 4 in which the weighing object M stays, and Then, it is determined that the feeder pan 4 is a feeder pan corresponding to the weighing hopper in which the weight of the object M to be held is determined to be equal to or less than the predetermined weight, and the stay elimination process is performed (step S38). On the other hand, when it is detected that the accumulation amount of the object M to be accumulated on the upper surface of the top cone 1 is not a predetermined amount or more (NO in step S36), it is assumed that the object M does not stay in the feeder pan 4. The bottom of the supply hopper 6 is closed (step S37), and the process ends. The above is a method for determining whether or not the object to be weighed M is staying on the feeder pan 4.

  In this embodiment, not only the weighing hopper 7 but also the weight of the weighing object M held by the corresponding supply hopper 6 is confirmed, but only the weight of the weighing object M held by the weighing hopper 7 is confirmed. Then, it may be determined whether or not the object to be weighed M stays in the feeder pan 4.

  Next, with reference to FIG. 4, the operation after it is determined that the object to be weighed M stays on the feeder pan 4 will be described. Specifically, a retention elimination process for eliminating the retention of the measurement object M in the feeder pan 4 will be described. FIG. 4 is a flowchart of the operation after it is determined that the object to be weighed M stays on the feeder pan 4. This operation is performed under the control of the arithmetic control unit 11.

  First, the feeder pan 4 in which it is determined that the object M is staying is temporarily vibrated under the first vibration condition (step S41). The first vibration condition may be any vibration condition including a case where the first vibration condition is the same as the above-described conveyance vibration condition, but it is preferable that the intensity of vibration is higher than the conveyance vibration condition. This is the case in the present embodiment. Specifically, the strength is about 50% of the maximum strength and the operation time is 200 ms in the conveyance vibration condition, whereas the strength is about 70% of the maximum strength and the operation time is 200 ms in the first vibration condition. . In setting the first vibration condition, not only the vibration intensity but also the vibration time may be changed. The intensity of vibration does not need to be constant. For example, when the vibration time is 200 ms, the intensity may be increased or decreased every 50 ms by dividing 200 ms into four. Note that the timing at which the feeder pan 4 is vibrated by the first vibration condition may be the same as the timing at which the other feeder pan 4 vibrates by the normal conveyance vibration condition (step S27 in FIG. 2) or is completely different. May be.

  When the stay of the object to be weighed M is eliminated by the vibration of the feeder pan 4 under the first vibration condition (step S41), the object to be weighed M of a predetermined weight or more is supplied to the weighing hopper 7 via the supply hopper 6. Will be. Since it is assumed that the operation shown in FIG. 4 is performed by taking over the operation shown in FIG. 3, the bottom of the supply hopper 6 is opened in step S33 of FIG. Therefore, the object to be weighed M discharged from the feeder pan 4 is directly supplied to the weighing hopper 7 via the supply hopper 6 whose bottom is open. However, the weighing object M may be once received by the supply hopper 6 and delivered from the feeding hopper 6 to the weighing hopper 7.

  Thereafter, the weight of the weighing object M held by the weighing hopper 7 corresponding to the feeder pan 4 vibrated under the first vibration condition is acquired (step S42). Subsequently, it is determined whether or not the weight of the object M acquired in step S42 is equal to or less than a predetermined weight (step S43). If it is determined that the weight of the object to be weighed M is equal to or less than the predetermined amount (YES in step S43), it is determined that the retention of the object to be weighed M in the feeder pan 4 has not been eliminated, and the process proceeds to step S44. On the other hand, if it is determined that the weight of the object to be weighed M is not less than or equal to the predetermined weight (NO in step S43), the stay of the object to be weighed M in the feeder pan 4 has been resolved, and the bottom of the supply hopper 6 is closed ( Step S45) The process ends.

  In step S44, the feeder pan 4 is vibrated under the second vibration condition. The second vibration condition may be any vibration condition including the same case as the first vibration condition, but it is preferable that the vibration intensity be higher than the first vibration condition. This is the case in this embodiment. Specifically, in the first vibration condition, the strength is about 70% of the maximum strength and the operation time is 200 ms, whereas in the second vibration condition, the strength is 100% of the maximum strength and the operation time is 200 ms. .

  Thereafter, the weight of the weighing object M held by the weighing hopper 7 corresponding to the feeder pan 4 vibrated under the second vibration condition is acquired (step S46). Subsequently, it is determined whether or not the weight of the object M acquired in step S46 is equal to or less than a predetermined weight (step S47). If it is determined that the weight of the object to be weighed M is equal to or less than the predetermined amount (YES in step S47), it is determined that the stay of the object to be weighed M in the feeder pan 4 has not been eliminated and an alarm is issued (step S48). ). In this embodiment, a sound alarm and a visual alarm are combined. Specifically, a sound is generated from the speaker of the operation setting display unit 10 and the fact is displayed on the screen (touch panel) of the operation setting display unit 10. However, instead of these, or together with these, the combination scale 100 may be provided with an alarm lamp to be lit. In addition, when it determines with the weight of the to-be-measured object M being below a predetermined weight (it is NO at step S47), the bottom part of the supply hopper 6 is closed noting that the stay of the to-be-measured object M in the feeder pan 4 was eliminated (step). S45) End. The above is the description of the operation (the stay elimination process) after it is determined that the object M is staying on the feeder pan 4.

  As described above, according to the combination weigher 100 according to this embodiment, when the object to be weighed M sticks to the feeder pan 4 and stays, this can be detected, and an appropriate operation according to the situation is performed. can do. In the present embodiment, the strength of the first vibration condition is not set to the maximum strength. When the feeder pan 4 is vibrated at the maximum strength from the beginning, the retention of the object to be weighed M is immediately eliminated and a large amount of objects to be weighed. This is because M may be discharged to the weighing hopper 7 (supply hopper 6).

  In this embodiment, the timing of the vibration of the top cone 1 by the main feeder 2 is not particularly described. However, when the feeder pan 4 is vibrated under the first vibration condition and / or the second vibration condition, it is synchronized with this. The top cone 1 may be vibrated. According to such a configuration, the object to be weighed M pushed out to the feeder pan 4 side by the vibration of the main feeder 2 applies force to the object to be weighed stuck to the feeder pan 4, so that the object to be weighed M is further peeled off. It becomes easy.

  Further, in the description of step S32 in FIG. 3, an example in which it is determined whether or not the weight of the object to be weighed M is 5 grams or less is shown. However, the reference weight does not necessarily have to be a fixed value. You may make it determine each time based on the weight of the to-be-measured object M which the measurement hopper 7 hold | maintains. For example, the average weight of the objects to be weighed M held by each weighing hopper 7 is calculated, and it is determined whether the weight is smaller than this by setting one-fourth or one-third of the average weight as a reference weight. You may make it do.

  In the present embodiment, a level sensor using infrared light is used as the accumulation amount detection means 3, but instead of this, a measuring instrument is provided below the top cone 1 and deposited on the upper surface of the top cone 1. The amount of accumulation may be detected by measuring the weight of the object to be weighed M. Further, in a normal weighing operation, objects to be weighed are simultaneously supplied to a plurality of weighing hoppers (see step S27 in FIG. 2), and at least one weighing hopper 7 is supplied with an object M having a normal weight. When being done, it may be determined that a predetermined amount or more of the measurement object M is accumulated on the upper surface of the top cone 1.

  The embodiment according to the present invention has been described above with reference to the drawings. However, the specific configuration is not limited to these examples, and there are design changes and the like without departing from the gist of the present invention. Are also included in the present invention. For example, instead of issuing an alarm when the stay is not resolved by two vibrations of the first vibration condition and the second vibration condition, an alarm is issued when the stay is not resolved at one time of the first vibration condition. Also good. In addition, when the stay is not eliminated by vibration due to the second vibration condition, the feeder pan may be vibrated under the third vibration condition.

  According to the present invention, when an object to be weighed stays in the feeder pan, this can be detected, and appropriate measures can be taken. Therefore, it is useful in the technical field of combination weighers.

1 is a schematic configuration diagram of a combination weigher according to an embodiment of the present invention. It is the flowchart which showed one measurement cycle of the combination scale which concerns on embodiment of this invention. It is a flowchart until it determines whether the to-be-measured item is staying on the feeder pan of the combination weigher concerning the embodiment of the present invention. It is a flowchart of the operation | movement after it determines with the to-be-measured object staying on the feeder pan of the combination weigher which concerns on embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Combination scale 1 Top cone 2 Main feeder 3 Accumulation amount detection means 4 Feeder pan 5 Linear feeder 6 Supply hopper 7 Weighing hopper 8 Weighing part 9 Collecting chute 11 Calculation control part
M Weighing object

Claims (8)

A top cone for distributing the object to be weighed supplied to the upper surface in the radial direction, a deposition amount detecting means for detecting the amount of the object to be weighed deposited on the upper surface of the top cone, and arranged around the top cone A plurality of feeder pans that receive the object to be weighed distributed from the top cone, and a linear that vibrates the feeder pan under a conveying vibration condition to convey the object to be weighed on the feeder pan radially outward A feeder, a plurality of weighing hoppers disposed directly below each of the feeder pans and receiving the weighing object directly or indirectly from the feeder pan, and the weighing objects received by the weighing hopper A weighing unit that measures the weight of each, a deposit amount detection means, the linear feeder, the weighing hopper, and an arithmetic control unit that controls the weighing unit , Equipped with a,
The arithmetic control unit detects that the accumulation amount of the object to be accumulated on the upper surface of the top cone is at least a predetermined amount by the accumulation amount detection means, and the weighing unit detects the weighing hopper. When it is detected once or a plurality of times that at least one holds an object to be weighed below a predetermined weight, it is determined that the object to be weighed stays in the feeder pan corresponding to the weighing hopper A combination weigher. A top cone for distributing the object to be weighed supplied to the upper surface in the radial direction, a deposition amount detecting means for detecting the amount of the object to be weighed deposited on the upper surface of the top cone, and arranged around the top cone A plurality of feeder pans that receive the object to be weighed distributed from the top cone, and a linear that vibrates the feeder pan under a conveying vibration condition to convey the object to be weighed on the feeder pan radially outward A feeder, a plurality of weighing hoppers disposed directly below each of the feeder pans and receiving the weighing object directly or indirectly from the feeder pan, and the weighing objects received by the weighing hopper A weighing unit that measures the weight of each, a deposit amount detection means, the linear feeder, the weighing hopper, and an arithmetic control unit that controls the weighing unit , Equipped with a,
The arithmetic control unit detects that the accumulation amount of the object to be accumulated on the upper surface of the top cone is at least a predetermined amount by the accumulation amount detection means, and the weighing unit detects the weighing hopper. In order to eliminate the retention of the weighing object in the feeder pan corresponding to the weighing hopper when it is detected once or a plurality of times that at least one holds the weighing object of a predetermined weight or less. A combination weigher that performs retention elimination processing.   The combination weigher according to claim 2, wherein the arithmetic control unit temporarily vibrates the feeder pan by the linear feeder under a first vibration condition as the stay canceling process.   The combination weigher according to claim 3, wherein the first vibration condition is a condition different from the conveyance vibration condition.   The apparatus further includes a main feeder that is controlled by the arithmetic control unit and vibrates the top cone, and the arithmetic control unit synchronizes with the vibration when the feeder pan vibrates temporarily with the linear feeder. The combination weigher according to claim 3 or 4, wherein a top cone is vibrated by the main feeder.   After the feeder control unit vibrates the feeder pan under the first vibration condition and the weighing hopper corresponding to the feeder pan further measures a predetermined weight or less, the stay in the feeder pan is eliminated. The combination weigher according to any one of claims 3 to 5, which is determined not to be present.   The combination weigher according to claim 6, wherein the arithmetic control unit issues an alarm when it is determined that the stay is not eliminated in any of the feeder pans.   The arithmetic control unit further vibrates the linear feeder further temporarily under a second vibration condition different from the first vibration condition when it is determined that the stay is not eliminated in any of the feeder pans. 6. The combination weigher according to 6.

Images