JPH08152353A - Method and apparatus for collecting material to be measured in combined measuring apparatus - Google Patents

Abstract

PURPOSE: To make it possible to perform interlocking operation together with a multiple-type packing machine and to shorten the discharging period by obtaining at least three or more sets of combined materials to be measured during one measuring cycle, allocating the combined materials to be measured into discharging paths less than the number of the sets, and discharging the materials. CONSTITUTION: The materials to be measured, which are measured and discharged by a plurality of measuring hoppers WH having two systems of discharging ports, are moved to an inner chute IB and right and left outer chutes OA and temporarily pooled in timing hoppers HA and HB. The discharging ports of the timing hoppers HA and HB communicate with the feeding ports of two lower chutes S having the different discharging ports. The materials to be measured are discharged through the lower chutes S at the different timing. During one measuring cycle, wherein the material to be measured for which the specified combination is obtained are discharged, at least three or more sets of the combined materials to be measured are obtained. The combined materials to be measured are allocated to two lower chutes S less than the number of the sets of the materials and discharged.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for collecting weighing objects in a combination weighing apparatus.

[0002]

2. Description of the Related Art In a combination weighing device using a plurality of weighing machines, it is possible to collect weighing objects by a structure as shown in the sectional front view of the essential part of FIG. 10 and the perspective view of the essential part of FIG. It is proposed by JP-A-57-125322 (hereinafter referred to as a conventional example). In the figure, a _{1 to} an
The weighed objects weighed by the plural weighing machines of the above are weighing hoppers b _{1 to} bn for opening both sides having two discharge ports bx and by.
Be transferred to. c is a substantially conical inner shoot portion c ₁
And a separation chute having a double structure in which the outer chute portion c ₂ is crossed, and the double-circle inlets d ₁ and d ₂ and the outlets e ₁ and e
Has ₂ and. The weighing objects discharged from the separating chute are supplied to buckets g ₁ and g ₂ which are interlocked with the packaging machine through timing hoppers f ₁ and f ₂ .

By the way, in such a combination weighing device, the total number of combinations when, for example, 10 weighing machines are used is 2 ¹⁰ −1 = 1023, of which 4 to 6 are included.
Number of combinations that contain weight value with the weighing machine of the platform _{is, 10 C 4 + 10 C 5} + 10 C 6 = become 672 kinds, it is about 66% near total. For this reason, in the combination weighing device that combines the weighing values of 10 weighing machines, the supply amount of each weighing machine is adjusted and controlled so that 4 to 6 weighing machines are selected as the optimum combination each time. In a combination weighing device using such ten weighing machines, it is almost 6 depending on the property of the weighing object.
Weighing is performed at a speed of 0 times / minute.

However, with the recent increase in demand for weighing-packed products, a packaging machine capable of high-speed processing of 120 times / min has been developed. In order to cope with this, a combination weighing device is attempted to devise a high-speed processing. Came. In the conventional example,
The weighing machine is added so that two groups for performing a series of weighing operations of supply, weighing, combination calculation, and discharging of the weighing objects coexist. FIG. 12 shows a timing chart of a weighing cycle in a conventional example, in which a plurality of weighing machines are divided into a first group and a second group, and when one group is in a supply stroke, the other group is The discharge strokes are overlapped with each other by ½ metering cycle so that there are at least two discharging strokes during one metering cycle.

That is, the combination operation is executed in response to the positive and negative timing signals, and for example, the positive timing signal is used to open the weighing hopper (WH) of the weighing machine of the first group which has performed the combination weighing. Discharge the articles, and use the negative timing signal to open the weighing hoppers of the second group that have performed the combination weighing and discharge the articles. The pool hopper (PH) of the weighing machine that has discharged the weighing object is opened while the weighing object is being discharged, and a new weighing object is supplied after the weighing hopper is closed with a certain time delay. Weighing is performed. In this way, one weighing cycle is executed in each of the first group and the second group.

Next, the operation of the conventional example will be described by a concrete example. For example, if 10 weighing machines are to participate in the combination each time so that the weighing objects are discharged from the approximately 4 weighing machines, the total number of the weighing machines is 14, and when the 14 weighing machines are combined, Select 10 weighing machines from the weighing machines and combine them, find the optimum combination of approximately 4 weighing machines closest to the target weight value, discharge the weighing objects, and then load the weighing objects to the discharged weighing machines. 1 remaining while resupplying
About 0 weighing machines are combined to discharge the weighing objects from about 4 weighing machines. Furthermore, while re-supplied the weighing machine with the discharged weighing machine, adding about 4 weighing machines that were discharged and re-supplied to the remaining 6 weighing machines before and after, weighing around 10 Machines are used for combination, and in the same way, weighed items are discharged from approximately four weighing machines. Thereafter, such an operation is sequentially repeated to discharge the combined weighing object twice during one weighing cycle. As described above, in the conventional high-speed type weighing device, the operation cycles of the two groups that perform combination weighing overlap each other by ½ pitch, thereby shortening the discharge cycle to the next-stage packaging machine to ½. .

[0007]

However, the above-mentioned conventional high-speed weighing is effective in the case where the discharged articles are sequentially collected by one chute. In the case of discharging, since the discharging cycle for each chute is doubled, the collecting speed of each chute has not been improved, and therefore, two sets of weighing objects are collected.
In the case of interlocking with a two-pack type wrapping machine that wraps the packages alternately or simultaneously, there is a problem that the processing speed of the wrapping machine cannot be further increased. Therefore, the present invention is intended to solve such problems of the conventional technology.

[0008]

According to the present invention, a weighing object is supplied to a plurality of weighing machines, the supplied weighing objects are weighed by the weighing machine, and a combination operation is performed based on the measured values to obtain a predetermined combination. It is characterized in that at least three sets or more of combination weighing products are obtained during one weighing cycle for discharging the weighing products, and these combination weighing products are distributed to a plurality of discharge paths smaller than the number of sets and discharged. And a method for collecting a weighing object in a combination weighing device, a plurality of weighing hoppers for weighing a weighing object and having two discharge ports, an inner chute for transferring the weighing object discharged from each weighing hopper, and left and right hoppers. An intermediate hopper, which is connected to the outer chute, the inner chute, and the left and right outer chutes, and temporarily pools the sample transferred from the inner and outer chutes, and the supply port is the same as the discharge port of each intermediate hopper. A combination weighing device, characterized in that it is provided with two lower chutes connected to each other and having different discharge ports, and driving means for opening and closing the discharge ports of the weighing hopper, and discharging the weighing object from the two lower chutes at different timings. In order to solve the above-mentioned problems of the prior art, the apparatus for collecting measured objects in (1) is provided.

[0009]

The present invention is to supply and weigh a weighing object to a weighing device.
During one weighing cycle of combination calculation and discharge, at least three or more sets of combined weighing objects are obtained, and these weighing objects are sorted and discharged to a plurality of discharging paths smaller than the number of sets. It can be linked with the packaging machine and the discharge cycle can be shortened. Moreover, since a digitally controlled motor such as a stepping motor is used as the drive source of the weighing device, the number of parts of the drive source can be reduced and the installation space can be reduced.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the present invention, at least three sets of combination weighing objects are obtained in the interval of a series of weighing object feeding, weighing, combination calculation and discharging operations, and a plurality of combinations of weighing objects smaller than the set number are obtained. It is characterized in that it is sequentially sorted and discharged to the discharge routes. Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic sectional front view of a combination weighing device used in the present invention, FIG. 2 (a) is an arrangement explanatory view of the combination weighing device of the first embodiment, and FIG. The front view and the same (c) are the side views.

As shown in the figure, a plurality of weighing machines, in the example shown in the figure, 18 weighing machines are arranged in a circle, and the dispersion feeder k
₁ , pool hopper P for weighing objects via radiation feeder k _2.
Supply to H. From the pool hopper PH, a weighing object is supplied to the weighing hopper WH at a predetermined timing, and weighing is performed by a load cell or the like (not shown). Below the weighing hopper, a chute having two internal and external discharge paths is arranged. This chute has a structure in which an outer chute OA is concentrically arranged around a funnel-shaped inner chute IB, and a lower end portion of the outer chute OA is further divided into two systems to form left and right timing hoppers HA and HB. Both timing hoppers HA and HB are connected to each other and face one lower chute s, respectively, and the objects discharged to the inner chute and the outer chute are integrated with the lower chute. In addition, the opening and closing gates of the weighing hopper of each weighing machine are double-opening gates that selectively open in opposite directions, and the joints of both gates are arranged along the upper edge of the inner chute, although not shown. Then, the weighing hoppers are configured to discharge the weighing objects to both the inside and outside chutes.

In the above-mentioned configuration, in the combination calculation, the supply amount to each weighing machine is adjusted so that four weighing machines are selected in the optimum combination each time, and the weighing hopper that discharges the weighing object. (WH) is immediately re-supplied with the weighing object from the upper pool hopper (PH), and the timing is adjusted to operate in the set cycle.

FIG. 3 is a timing chart of the weighing cycle. Next, this timing chart will be described. In this example, first, nine weighing machines are selected from the eighteen weighing machines, the weighing values are read, and the combination calculation is performed based on the readings ((c) in the figure), and the four weighing machines closest to the target weight value are selected. The combination of weighing machines is obtained, and the weighed articles of the obtained set are discharged to the inner chute IB ((f) in the figure). Then, at a predetermined timing when the discharge process is not completed, 9 units are selected from the remaining 14 units, the measured value is read, and the combination calculation is performed based on the selected value ((d) in the figure). The combination of the weighing machines is obtained, and the weighed articles of the obtained set are discharged to the outer chute OA this time ((g) in the same figure).

Further, at a predetermined timing when the discharge process is not completed, the remaining 10 to 9 units are selected, the measured values are read, and the combination calculation is performed in the same manner ((e) in the same figure).
This time, the combined weighing objects are discharged from the four weighing machines to the inner chute IB ((h) in the figure). Next, at a predetermined timing at which the discharging process did not end, the four weighing machines discharged and supplied for the first time were added to the remaining six weighing machines 10 at the end.
9 weighing machines are selected from the four weighing machines, and the fourth combination calculation is performed in the same manner ((c) in the figure), and the combined weighing objects are discharged from the four weighing machines to the outer chute OA this time ( The same figure (f) d). Thereafter, such an operation is sequentially repeated, and the combined weighing objects are sequentially discharged three times during one weighing cycle, and the discharged weighing objects are alternately distributed to the two discharging paths and discharged. The distribution of the discharge path is performed by controlling the gate driving stepping motor of the weighing hopper described later.

As described above, in the first embodiment, the respective operation cycles of the three groups for performing the combination weighing are overlapped with each other by 2/3 weighing cycles, and three sets of weighing objects are provided during one weighing cycle. Is alternately discharged to the two discharge paths. In this example, the timing hopper is not always necessary, but if the timing hopper is provided, it is possible to discriminate the combination weighing objects flowing back and forth through the chute for each combination unit, and improve the collecting ability in the chute. There is.

FIG. 4 is a flow chart showing the operation procedure of the first embodiment. Next, this flowchart will be described. (1) It is confirmed that the timing signal T _A or T _B is input from the packaging machine (step P ₁ ), and if the input signal is T (step P ₂ ), the flag F is set to 1 (step P ₂ ). P _3), to open and close the timing hopper HA (step P _4). If the input timing signal is not T _A , the flag F is set to 0 (step P ₅ ) and the timing hopper HB is opened / closed (step P ₆ ). (2) Select the weighing machine from which the weighing object was not discharged the previous time and the last time before (step P ₇ ), and input the weight from the selected weighing machine (step P ₈ ). Next, the weights of the selected weighing machines are arranged in descending order of the non-emission count value (step P ₉ ), the top 9 weighing machines are selected (step P ₁₀ ), and the combination calculation is performed by the selected weighing machines. Then, a combination of the target weight or more and the upper limit weight or less is obtained (step P ₁₁ ).

(3) If the combination is obtained under the condition of step P ₁₁ (step P ₁₂ ), and if the flag F is 1 (step P ₁₃ ), the weighing hopper of the weighing machine corresponding to the obtained combination is obtained. Open and close the outer gate A of the
₁₄ ) Discharge the weighing material to the outer chute OA. Also,
Otherwise the flag F is 1, and closing the inner gate B of the weighing hoppers of the weighing machine corresponding to the combination obtained (step P _15), to discharge the weighed to the inner chute IB.

(4) The non-discharging count value of the weighing machine whose gate is opened / closed is cleared to zero, and the non-discharging count value of the weighing machine not opened / closed is incremented by 1 (step P ₁₆ ). The pool hopper corresponding to the weighing machine with the gate opened and closed is opened and closed to supply the weighing object (step P ₁₇ ). In the process of step P _12, if not predetermined combination is obtained, the weight and opening and closing the pool hoppers for a constant weight or less of the weighing machine, and supplies add weighed (Step P _18).

(5) The operation of the radiation feeder corresponding to the opened / closed pool hopper is started (fixed time), and further the operation of the fractional feeder is started (fixed time) (step P ₁₉ ).
FIG. 5A is a layout explanatory view of the second embodiment, and FIG.
Is a side view thereof, and FIG. 5 (c) is a plan view taken along the line II of FIG. 5 (a). In this example, the operation cycle of the group performing combination weighing is completely overlapped, and a series of operations such as supply, weighing, combination calculation, and discharge are performed at the same time, and the timing is shifted in the process of collecting the objects in the lower stage. It is characterized in that the weighed material is discharged alternately to the two discharge routes, and at the final stage, discharge is performed at the same discharge timing as in the first embodiment. In order to collect such a weighing object, in the second embodiment, the arrangement of the weighing machine is the same as that of the first embodiment, but the outer chute is completely separated into two left and right systems, Left outer shoot OA ₁
And the right outer chute OA ₂ are independent. The combination weighed product discharged to the left outer chute OA ₁ is fed to the intermediate hopper H ₁ , the combined weighed product discharged to the inner chute IB is fed to the intermediate hopper H ₂ , and the combined weighed product discharged to the right outer chute OA ₂ is fed. After being collected by the intermediate hoppers H ₃ , respectively, the timing hoppers HA ₁ , HA ₂ , HA ₃ are collected.
It is configured to be discharged to the outside from the lower chute S via the. Then, in the combination calculation, the supply amount of each weighing machine is adjusted so that four weighing machines are selected in the optimum combination every time, and the weighing hopper that discharged the weighing object immediately feeds the weighing object. Are set to be re-supplied.

FIG. 6 is a timing chart of the weighing cycle of the second embodiment. Next, this timing chart will be described. First, the measured values of all the weighing machines are read all at once, and then the nine weighing machines on the right side are selected and a combination calculation is performed to obtain one set of four weighing machines closest to the target weight value. Next, 9 weighing machines on the left side are selected and a combination calculation is performed, and one combination of 4 weighing machines is similarly obtained. Further, 9 of the remaining 10 weighing machines are selected and a combination operation is performed to obtain one set of 4 weighing machines [FIG. 6 (c)].

Of the three sets of combination weighing products obtained, those obtained in the right side group are in the right outer chute OA ₂ , those obtained in the left side group are in the left outer chute OA ₁ , and those obtained in the remaining groups are They are discharged to the inner chutes IB at the same time, or sequentially each time the combination calculation is completed [see FIGS. 6 (d), (e), (f) and (a), (b)].

The three sets of objects discharged from each group are once pooled by the corresponding three intermediate hoppers [FIGS. 6 (g), (h), (i)], and at the predetermined timing, the The two rows of timing hoppers are simultaneously transferred to one row [Fig. 6 (c)], and in the next cycle, the three sets of objects pooled in the intermediate hopper are set at the set timing, this time the other set. Transfer them all at once to the row of timing hoppers [Fig. 6 (d)]. In this way, three sets of weighing objects are alternately transferred to the two rows of timing hoppers for each weighing cycle. On the other hand, the timing hopper of each row sequentially discharges three sets of the weighing articles to the lower chute until the next feeding of the weighing articles in the row. At that time, the objects to be measured are sequentially discharged with a phase difference of 60 degrees between the rows A and B, and a phase difference of 120 degrees in each row.

As described above, in the second embodiment,
Despite the simultaneous discharge of three sets from the weighing hopper of the combination weighed product, at the bottom stage connected to the packaging machine, three sets of weighing products are sequentially discharged at equal pitches during one weighing cycle. Moreover, the weighing objects are alternately discharged to the two lower chutes in the lowermost stage. That is, in the second embodiment, three sets of weighing objects are simultaneously collected in three discharge paths during one weighing cycle, and in the lower stage, these weighing objects are switched to two discharging paths and sequentially discharged. Therefore, it is possible to collect with plenty of time in the upper stage, which takes the longest time to collect the measured items, and in the lower stage, discharge the measured items collected in one unit, so discharge at a higher speed than the upper stage. However, there is an advantage that it is possible to sufficiently discriminate the weighing objects discharged before and after. Although a total of six timing hoppers are used in the above description, this is to allow a sufficient margin for the operation of the opening / closing gate of the intermediate hopper in the upper stage, and the timing hopper can be omitted. In this case, the three intermediate hoppers are controlled so that the right and left lower chutes are alternately discharged with the objects to be weighed.

FIG. 7 is a flow chart showing the processing procedure of the second embodiment. Next, this flowchart will be described. (1) Set index i to 0 (step S
₁ ) If the timing signal T _A or T _B is input from the packaging machine (step S ₂ ), 1 is added to the index i (step S ₃ ). If the next input timing signal is T _A (step S ₄ ), the flag F is set to 1 (step S ₅ ). Then, timing hopper HA
The opening and closing of the timing hopper of _{one of} the HA ₁ , HA ₂ and HA ₃ in the corresponding order is started (step S ₆ ). If the input timing signal is not T _A , the flag F is set to 0 (step S ₇ ), and the timing hoppers HB ₁ and HB are set.
_{Of the 2} and HB ₃ , the opening and closing of one of the timing hoppers of the corresponding rank is started (step S ₈ ).

(2) The processes of steps S _{2 to} S ₇ are repeated until the index i becomes 3 (step S ₉ ), i =
If 3, (step S ₁₀₎ when a flag F = 1, the intermediate hopper H _1, H _2, to start the opening and closing of the gate of the H ₃ and B-side (step S _11). If the flag F is not ₁ , the opening and closing of the gates on the A side of the intermediate hoppers H ₁ , H ₂ and H ₃ are started (step S ₁₂ ).

[0026] (3) enter the weight from the weighing machine (step S _13), the right group nine weighing machines to combination calculation, obtaining a set of combinations R (step S _14). next,
And the combination calculation in the left group nine weighing machines, finding a set of combined L (step S _15). Then, the combination R,
The remaining weighing machines that are not selected for L perform a combination calculation,
Determining a set of combinations RL (Step S _16).

(4) If the combination of steps S ₁₄ , S ₁₅ , and S ₁₆ is obtained (step S ₁₇ ), the combination R, L, RL is obtained.
Gating the weighing hoppers selected weighing machine started (step S _18), starts the opening and closing of the pool hopper corresponding to the weighing machine that initiated the gating (step S _19).
If the above combinations are not obtained, the opening and closing of the pool hopper corresponding to the weighing machine having a weight less than a certain weight is started (step ₂₀ ).

Next, to start the operation of the radiation feeders corresponding to the pool hoppers that initiated the closing, starting further also operation of the dispersion feeder (step S _21), the process returns to step S. The methods described so far are the modes in which three sets of combinations are obtained during one weighing cycle, and these are collected and discharged to two discharge routes. The present invention is not limited to the mode. For example, four sets of combinations are obtained during one weighing cycle, and the combinations are collected and discharged to two systems or three sets of discharge paths that are smaller than the number of combinations. Embodiments are also possible.

FIG. 8 is a plan view showing an example in which the weighing machines are arranged in an oval shape. In the case of this example, seven weighing machines are arranged in the left and right semicircular portions a and b, and four weighing machines are arranged in the central portion c. It becomes easy to separate and connect the respective parts a, b, and c, and by removing the central part c as required, a circular weighing device can be constructed with 14 left and right weighing machines. In addition, the three discharge paths from the weighing hopper to the intermediate hopper can be configured without difficulty, and moreover, the sliding distances of the chutes from the respective weighing hoppers to the intermediate hopper can be made substantially equal to each other, and the weighing objects can be collected. Variation in time can be reduced.

FIGS. 9, 13, and 14 are mechanical views of the drive portion of each weighing machine. FIG. 9 is a front view, FIG. 13 is a right side view, and FIG. 14 is a left side view. is there. Next, this configuration diagram will be described. There are _two stepping motors, M ₁ and M ₂ , above and below. The upper one drives the weighing hopper (WH) and the lower one drives the pool hopper (PH).
A cam 2 for opening and closing the outer gate G1 of the WH is fixed at the right end of the drive shaft 1 of the upper stepping motor M ₁ , and a cam 3 for opening and closing the inner gate G2 of the WH is provided at the left end thereof (see FIG. 14). (See) is fixed. Then, when opening the gate G1 outside the WH,
In FIG. 3, the drive shaft 1 is rotated 180 degrees counterclockwise. Then, cam 2 pushes down cam follower 4,
Along with that, the lever 5 and the lever 7 are integrated into a shaft 6
Is rotated clockwise, and the lever 7 pushes the lever 8 on the WH side forward to rotate the lever 8 around the shaft 9 in the counterclockwise direction. Then, the link 10 is pushed down in the clockwise direction, and accordingly, the outer gate G1 of the WH is moved to the shaft 1
The outer gate G1 is opened by rotating clockwise about 1.

When the outer gate G1 is closed, the upper stepping motor is reversely rotated (clockwise),
Return the cam 2 to the initial position. Then, the lever 5 and the lever 7 are rotated counterclockwise with the rotation of the cam 2 by the pulling force of the spring 12, and at the same time, the lever 8 of WH is also rotated clockwise by the pulling force of the spring 13.
The outer gate G1 is closed. On the other hand, the inner gate G2 of WH
Drive shaft 1 of the upper stepping motor
Is rotated 180 degrees counterclockwise in FIG. At this time, in FIG. 13, the drive shaft 1 rotates 180 degrees clockwise. Then, the cam follower 4 shown in FIG. 13 is not affected by the cam 2, but the cam follower 1 shown in FIG.
4 is pushed down by the rotation of the cam 3, whereby the levers 15 and 16 rotate in the counterclockwise direction around the shaft 17. Then, the roller 18 rotates clockwise around the shaft 19, and the link 20 also rotates the pin 21 clockwise around the shaft 22 while rotating clockwise around the pin 21 so that the inner gate G2. To release. Also, when closing, the upper stepping motor is rotated in reverse and the spring 2
Lever 15, 16 and roller 1 by pulling force of 3, 24
8 and the link 20 are pulled back to close the inner gate G2.

On the other hand, the drive shaft 2 of the lower stepping motor
As shown in FIG. 13, a cam 26 for simultaneously opening and closing both gates of PH is fixed to the end of 5, and
When opening and closing both gates, lower stepping motor M
Rotate ₂ 360 degrees. Then, in the first 180-degree rotation, the cam 26 pushes up the cam follower 27, which causes the levers 28 and 29 to rotate clockwise around the shaft 30, and accordingly, the lever pin-coupled via the link 31. 32 rotates counterclockwise around the shaft 33, and the lever 34 also rotates counterclockwise with the rotation of the shaft 33, pushing the lever 35 on the PH side forward. Then, the lever 35 rotates in the counterclockwise direction around the shaft 36, and accordingly, the link 37 rotates in the clockwise direction around the pin 38, while rotating the pin 38 in the clockwise direction around the shaft 39. And open one gate. When one gate opens, the link 4 on the opposite side shown in FIG.
0 rotates, which causes the other gate to open. When the cam 26 further rotates 180 degrees, the springs 41,
Due to the pulling force of 42, the cam follower 27 descends, the levers 28, 29, 32, 34 and the links 31, 37, 40 rotate in the opposite direction accordingly, and both gates are closed. Discs D1 and D2 each having a slit are attached to the drive shaft of each stepping motor, and the slits are configured to be detected by the optical sensors F1 and F2. This is for determining the initial position of each drive shaft, and usually does not require positioning, but it is used especially when the stepping motor goes out of step and runs out of control.

The optical sensors F1 and F2 and the load cell R are fixed to the brackets X ₁ , X ₂ and X ₃ , respectively,
The brackets X ₁ and X ₂ are fixed to the frame base Y. Conventionally, a constant-speed rotation motor is used as a drive source of the weighing device, and a cam, clutch, brake, etc. are used.
The opening and closing gates of the weighing hopper and pool hopper were driven and controlled. Therefore, there are problems that the number of parts increases, the mechanism of the drive unit becomes complicated, and that maintenance and maintenance and part management become complicated. On the other hand, in the present invention, since the stepping motor whose rotational speed, rotational direction, etc. can be freely changed and controlled is used, the following advantages can be obtained.

(1) Since the clutch, brake, etc. can be omitted, the space for the drive unit can be reduced. (2) The opening / closing gate of the weighing hopper or the like can be controlled to be opened / closed according to the property of the weighing object, and cracking or noise of the weighing object can be prevented. (3) It is possible to control opening / closing of the double-opening gates of the weighing hopper independently by properly using one stepping motor for normal rotation and reverse rotation. Therefore, the drive unit can be downsized, the number of parts can be reduced, and the maintenance and maintenance can be simplified. (4) Since the rotation speed and the rotation direction can be easily changed by digital control and the open loop control can be performed, the design can be easily changed and the degree of freedom is high. In addition to the stepping motor, the same effect can be obtained by using a servo motor whose rotational speed and rotational direction can be freely changed and controlled.

[0035]

As described above, according to the present invention, at least three sets of weighing objects are obtained during one weighing cycle, and these weighing objects are distributed to a plurality of discharge paths smaller than the number of sets. Since it is designed to be discharged in the same way, it is possible to work with a multiple-type packaging machine, and it is possible to shorten the discharge cycle of the weighing products discharged to that packaging machine compared to the past and improve its processing capacity. The effect is that it can be done. Also, since a digitally controlled motor such as a stepping motor is used as the drive source of the weighing device,
As described above, the number of parts of the drive source can be reduced, and the installation space can be reduced.

[Brief description of drawings]

FIG. 1 is a schematic sectional front view of a combination weighing device.

FIG. 2A is a plan view of the combination weighing device according to the first embodiment, and FIG. 2B is a front view of an object collecting unit.
(C) is a side view.

FIG. 3 is a timing chart of the first embodiment.

FIG. 4 is a flowchart of the first embodiment.

FIG. 5A is a front view of a weighing object collecting unit according to a second embodiment, FIG. 5B is a side view thereof, and FIG. 5C is a plan view of the I-I arrow view of FIG. 5A. It is a figure.

FIG. 6 is a timing chart of the second embodiment.

FIG. 7 is a flowchart of a second embodiment.

FIG. 8 is a plan view showing another arrangement example of the weighing machine.

FIG. 9 is a mechanism diagram of a drive unit of the weighing device.

FIG. 10 is a sectional front view of a main part of a conventional example.

FIG. 11 is a perspective view of the relevant part.

FIG. 12 is a timing chart of a conventional example.

FIG. 13 is a mechanism diagram of a drive unit of the weighing device.

FIG. 14 is a mechanism diagram of a drive unit of the weighing device.

[Explanation of symbols]

PH ... Pool hopper, WH ... Weighing hopper, K ₁ ... Dispersion feeder, K ₂ ... Radiation feeder, OA ... Outer chute, I
B ... Inner chute, HA, HB ... Timing hopper, H
₁ , H ₂ , H ₃ ... Intermediate hopper, S ... Lower chute, M
₁ , M ₂ ... Stepping motor.

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[Procedure amendment]

[Submission date] May 10, 1995

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be amended] Claims

[Correction method] Change

[Correction content]

[Claims]

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0008

[Correction method] Change

[Correction content]

[0008]

According to the present invention, the weighing objects are supplied to and weighed by a plurality of weighing machines, and the obtained weighing objects are combined to obtain an optimum combination of the weighing objects. A device that discharges the weighing object and causes the empty weighing machine to coexist with three sets of processes for supplying the weighing object again at the same time. The first set is the operation of supplying the weighing machine to the empty weighing machine. The second set is
The third set is the operation for finding a new optimum combination of weighing objects from the remaining weighing machines that do not perform these discharging / supplying operations.
A weighing object in a combination weighing device, characterized in that it comprises control means for advancing in the same event and means for switching the discharging direction and alternately discharging to two discharge paths each time an optimal combination of weighing objects is obtained. The problem of the above-mentioned prior art is solved by providing the collecting device.

Claims (8)

[Claims] 1. A weighing system in which weighed articles are supplied to a plurality of weighing machines, the weighed articles are weighed by the weighing machines, a combination operation is performed based on the measured values, and the weighed articles having a predetermined combination are discharged. Weighing in a combination weighing device, characterized in that during a cycle, at least three sets or more of combination weighings are obtained, and these combination weighings are distributed to a plurality of discharge paths smaller than the number of sets and discharged. How to collect things. 2. A weighing cycle, in which one weighing cycle supplies a weighing object to a plurality of weighing machines, weighs the fed weighing object, and a combination operation is performed based on a weighing value, and a weighing object for which a predetermined combination is obtained. In this case, the combination weighing is performed in three groups, and the above weighing cycles of each group are overlapped by 2/3 weighing cycles so that 3 weighing cycles are performed during one weighing cycle. A method for collecting a weighing object in a weighing apparatus, wherein sets of the weighing objects are alternately discharged to two discharge paths. 3. One weighing which supplies the weighing objects to a plurality of weighing machines, weighs the fed weighing objects by the weighing machines, performs a combination calculation based on the weighing values, and discharges the weighing objects having a predetermined combination. During the cycle, three sets of combined weighings are determined, these combined weighings are collected simultaneously in the three first discharge paths, and two combined weighings are collected below the first discharge path. The method for collecting a weighed item in a combination weighing device, wherein the second weighed item is alternately switched to the second discharge route. 4. A plurality of pool hoppers for accommodating the objects to be transferred to the weighing device, and corresponding to the pool hoppers, the objects discharged from the gate of the pool hopper are weighed, and either of the left and right gates is weighed. It is equipped with a weighing hopper that discharges the weighing object from one side, an inner chute and an outer chute that transfer the weighing object discharged from the weighing hopper to the outside, and each gate of the pool hopper and the weighing hopper is driven by a digitally controlled motor. A collecting device for a weighing object in a combination weighing device. 5. The apparatus for collecting weighing objects in a combination weighing apparatus according to claim 4, wherein a stepping motor is used as the digitally controlled motor. 6. The weighing object collecting device in the combination weighing device according to claim 4, wherein a servo motor is used as the digitally controlled motor. 7. A plurality of weighing hoppers for weighing a weighing object and having two outlets, an inner chute and left and right outer chutes for transferring the weighing object discharged from each weighing hopper, the inner chute and the left and right outer sides. An intermediate hopper that is connected to each chute and temporarily pools the objects to be weighed transferred from each of the inner and outer chutes, two lower chutes each having a different discharge port, the supply port being commonly connected to the discharge port of each intermediate hopper, and the weighing hopper Is provided with driving means for opening and closing the discharge port of the above, and the weighing object is discharged from the two lower chutes at different timings. 8. The weighing object collecting device in the combination weighing device according to claim 7, wherein two series of timing hoppers are connected between the intermediate hopper and the lower chute.