JPH09301521A - Preventive maintenance method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To preventively perform adjusting work and changing work for a consumed part by observing the degree of consumption with age of a facility. SOLUTION: The deviation amount (x) between the predetermined pulse value in which articles to be joined from a plurality of sub conveyors and to be conveyed on a main conveyor will pass the positions of detectors 7021 and an actual pulse value in which the articles passed the positions of the detectors 7021 is found, the variation (b) found by compiling statistics on the deviation amount (x) for each sub conveyor is compared with the preset judgment reference value (d), and the presence or absence of necessity for maintenance work is judged.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a preventive maintenance method that uses variations obtained by statistical processing, and more particularly to a preventive maintenance method that uses variations obtained by statistically processing the amount of displacement of an article. It is a thing.

[0002]

2. Description of the Related Art As a conventional technique relating to a preventive maintenance method, a technique disclosed in Japanese Patent Application Laid-Open No. 7-315527 is known.

The conventional technique described in the above publication will be described in Japanese Patent Application Laid-Open No. 7-315527.
Basic data consisting of one or a combination of life time, maintenance time, number of life operations, number of maintenance operations for each part of each device that constitutes the logistics system, and operation time or number of operations for each part of each device Alternatively, a preventive maintenance notification system for a physical distribution system that predicts the replacement / inspection time for each part based on operation status data including both of them and outputs the prediction result is described.

[0004]

However, the above-mentioned prior art has the following problems.

That is, Japanese Unexamined Patent Publication No. 7-315527 discloses that the operation time or the number of operations is totaled to determine whether maintenance work is required. There is no description or suggestion of obtaining the deviation amount and statistically processing the deviation amount to determine whether maintenance work is necessary.

Therefore, an object of the present invention is to obtain the deviation amount between the planned pulse value and the actual pulse value, and statistically process the deviation amount so as to determine whether maintenance work is required. An object of the present invention is to provide a preventive maintenance method in which the degree of wear and the like over time can be observed and the work of adjusting and replacing the wear parts can be performed proactively.

[0007]

SUMMARY OF THE INVENTION According to the present invention, an expected pulse value at which an article merged from a plurality of tributary conveyors and conveyed on the mainstream conveyor passes the position of a detector and the article passes the position of the detector. Determine the amount of deviation from the actual pulse value, and compare the variation calculated by statistically processing the amount of deviation for each tributary conveyor with a preset judgment reference value to determine whether maintenance work is required. The above object is achieved by providing a preventive maintenance method characterized in that

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below together with examples of article load assembling equipment suitable for carrying out the same.

FIG. 1 is a perspective view showing an embodiment of an article arranging facility, and FIG. 2 is different from the article storage and arranging apparatus shown in FIG. 1 in that the number of rows of tributary conveyors and the arrangement of main conveyors are different. Points are perspective views of the article storage / loading apparatus that is substantially the same as the article storage / loading apparatus shown in FIG. 1, FIG. 3 is an enlarged perspective view of the tip of the tributary conveyor shown in FIG. 2, and FIG. 26 rows in the direction along the top and bottom, 5 rows in total 1
FIG. 5 is an elevation view of a fluidized shelf formed by arranging 30 pieces.
1 is different from the knitting conveyor shown in FIG. 1, but in other respects, the tilt conveyor, knitting conveyor, stopper and the like are substantially the same enlarged perspective view, and FIG. 6 is the tilt conveyor, knitting conveyor shown in FIG. FIG. 7 is an explanatory view of operations of stoppers, etc., FIG. 7 is a time chart of operations of the inclined conveyor, knitting conveyor, stoppers, etc. shown in FIG. 6, FIG. 8 is an enlarged perspective view of the article loading device shown in FIG. 1, and FIG. 9 is FIG. 10 is an explanatory view of an operation of the article loading device shown in FIG. 10, FIG. 10 is an explanatory view showing an example of a speed change state of the transport speed of the container forced transport device, and FIG. 11 is a control system suitable for carrying out the preventive maintenance method of the present invention. It is a block diagram which shows an Example.

In these drawings, reference numeral 1000 denotes a box unpacking device for peeling the upper outer flaps on the left and right side surfaces of a box body such as a corrugated box from the inner flap, and 2000 denotes the lower side surface portions of the box body. A box unpacking device for peeling the outer side flap from the inner flap 3000 is a pusher that changes the transport direction of the box body in which the upper outer flap and the lower outer flap are peeled from the inner flap, and is freely peeled off. The upper outer flap and the lower outer flap, which are in the state, are not locked again by the inner flap. Also,
Reference numeral 4000 is a flap opening device for opening one of the pair of side surfaces separated from the inner flap (the front side in the traveling direction) of the upper outer flap and the lower outer flap, and 5000 is an article housed in the box. A device for ejecting articles by G being pushed out horizontally by a pusher, 60
Reference numeral 00 denotes an article supply device in which an oscillating conveyor is mounted on a traveling trolley, and an article storage and alignment device 7 for loading the articles G taken out of the box body by the article take-out device 5000.
Tributary conveyors 7 arranged in multiple rows of 000
It is designed to be supplied to 001. Further, reference numeral 7000 is an article storage and arranging device provided with a fluidized shelf 7004 in which a plurality of rows of multi-branch conveyors 7001 each composed of a gravity roller conveyor on which an article G is placed according to product type are arranged. The articles G are moved from the entrance side to the exit side by their own weight, and each tributary conveyor 7001 is moved by the article take-out device 7003.
Multi-stage mainstream conveyor 700 provided corresponding to
2 is carried out at intervals of each stage of the mainstream conveyor 7002, and is carried to the inclined conveyor 9010 via the separating conveyor 9006 and the like. Also, 80
Reference numeral 00 denotes an article loading device for loading the articles G, which are continuously loaded by the article storage / load sorting apparatus 7000, into the moving load sorting container C, and includes an article supply conveyor 8002 and a container transport conveyor 8001. Supply conveyor 80
By 02, the articles G knitted into an aggregate consisting of a plurality of rows by a stopper 9030 described later are loaded in a direction substantially parallel to the front wall C1 of the load-sorting container C. Further, 9001, 9004, and 9005 are roller conveyors, 9002 and 9003 are stoppers, and 9007 is a stepping device for stepping out a plurality of steps of the articles G taken out from the box body by the article taking-out device 5000. Further, 9010 is a plurality of rows of inclined conveyors that convey the articles G at intervals in each row, and 9020 is a knitting conveyor arranged on the downstream side of the inclined conveyor 9010, and the plurality of rows of articles G are laid out. It is provided with a side guide 9021 composed of an endless round belt 9211 for rotating. Further, 9030 is a stopper arranged on the downstream side of the knitting conveyor 9020 so that a plurality of rows of articles G conveyed on the knitting conveyor 9020 can be stopped. Then, the article G is taken out from the box body in which a plurality of articles G of the same type are stored by the article take-out device 5000, and the taken-out article G of the same type is a fluidized shelf of the article storage / loading device 7000. The articles G are placed on a plurality of stages of tributary conveyors 7001 located in the same row of 7004, and the desired number of the articles G placed on the tributary conveyor 7001 are taken out and joined to each of the mainstream conveyors 7002. The merged articles G reach the knitting conveyor 9020 through the separating conveyor 9006 and the like at intervals of the respective inclined conveyors 9010, and reach the knitting conveyor 9020. The articles G that should be the head in each row of the aggregate including a plurality of rows. And the article G to be the last in each row of the previous assembly is separated by the stopper 9030 to knit the articles G in a plurality of rows into an assembly consisting of a plurality of rows, and then by the article input device 8000, The articles G are loaded in an aligned state so that the articles G are stacked in the load arranging container C moving downward. Note that the deviation between the expected pulse value at which the article G merged from the plurality of tributary conveyors 7001 and conveyed on the mainstream conveyor 7002 passes the position of the detector 7021 and the actual pulse value at which the article G passes the position of the detector 7021. The amount x is calculated, and the deviation x is calculated for each tributary conveyor 700.
The variation b obtained by the statistical processing for each one is compared with a preset reference value d to determine whether maintenance work is necessary.

Each part of the above embodiment will be described. The tributary conveyor 7001 includes a plurality of rollers 7011.
A pair of rail frames 7012 provided with are arranged in an inclined shape, and the article G supplied by the article supply device 6000 on the tributary conveyor 7001 runs on the roller 7011 by its own weight and is stored (storage). After that, the mainstream conveyor 70 is operated by the article take-out device 7003.
It is designed to be taken out of No. 02 and merged.

The mainstream conveyor 7002 is a belt conveyor (shown in FIG. 2) having a speed of about 67 m / min, which is arranged so as to connect the article take-out device 7003 provided at the tip of the side-by-side branch conveyor 7001. In the embodiment, five roller conveyors are provided in the vertical direction so as to be substantially orthogonal to the tributary conveyor 7001. The main conveyor 7
A pulse encoder 7023 is attached to 002. Further, a detector (photoelectric switch) 7021 for detecting the conveyed article G is provided at the outlet of each mainstream conveyor 7002.

Further, the article take-out device 7003 has a shaft 7
A cross section swinged by the air cylinder 7032 with the 033 as a fulcrum is provided with a stopper 7031 having a substantially U-shaped cross section, and a chute 7034 disposed downstream of the stopper 7031. When the rod of the air cylinder 7032 is in a protruding state, The upper end of the front wall of the stopper 7031 is a roller 701
1 is configured to protrude from the upper surface of the
The front wall 1 locks the article G that is self-propelled in the tilt direction. When an article removal command is issued, the upper end of the front wall of the stopper 7031 is lowered from the upper surface of the roller 7011 by operating the air cylinder 7032, and the article G at the tip locked by the front wall of the stopper 7031 is stopped. Take out. At that time, the stopper 7031
Since the upper end of the rear wall is higher than the upper surface of the roller 7011, the succeeding article G is locked by the rear wall of the stopper 7031, and the article G stored (placed) on the tributary conveyor 7001 is transferred to the main conveyor 7002. Only one can be taken out. Further, a chute 7034 for carrying out the articles G taken out one by one by the stopper 7031 to the mainstream conveyor 7002 is composed of a pair of rail frames 7341 having a plurality of rollers.
The rail frame 7341 of 034 is a tributary conveyor 700.
It is arranged at a steeper slope than the first rail frame 7012.

The method of taking out and aligning the articles G placed on the tributary conveyor 7001 of the article storage / loading apparatus 7000 will be described below. The flow shelf 7004 shown in FIG. 4, that is, the tributary conveyor 7001 is the main stream conveyor 7002. A description will be given based on another embodiment in which a total of 130 pieces are arranged in 26 rows in the direction along and five rows in the vertical direction. 1a, 1
b, ..., 1z are branch symbols indicating respective tributary conveyors 7001 arranged in the first stage from the bottom, and the mainstream conveyor 7
When viewed from 002, the most downstream side is 1a, the most upstream side is 1z, and 2a, 2b, ..., 2z are branch codes indicating respective tributary conveyors 7001 arranged in the second stage from the bottom.
The tributary conveyor 7001 arranged from the third stage to the fifth stage from the bottom is similarly shown.

Thus, each tributary conveyor 7001
There are a plurality of articles G for each product type in the article supply device 6000.
The articles G of the same type are supplied to and placed on the tributary conveyors 7001 of all the stages located in the same row.
Is placed. That is, the tributary conveyors 1a, 2a, 3
a, 4a, 5a are articles of type a, and tributary conveyors 1b, 2b, 3b, 4b, 5b are articles of type b, Gb.
However, similarly to the other tributary conveyors 7001, z-type articles Gz are placed on the tributary conveyors 1z, 2z, 3z, 4z, and 5z.

First, in the case of arranging the articles G in units of the arranging container C, articles of the same type, for example, only the articles Ga are laid out in m rows (for example, 4 rows) × n columns (for example, 5 rows). Explaining the case, since the articles Ga are placed on the respective stages, the tributary conveyors 1a, 2
Each article take-out device 7003 provided at the tip of a, 3a, 4a, 5a takes out one article Ga into each main stream conveyor 7002 substantially at the same time, and a total of five articles Ga are taken out. Further, similarly, taking out the articles Ga for each stage is repeated three times at substantially the same time, and four articles Ga are loaded on each main stream conveyor 7002. 20 items of goods Ga arranged
Is conveyed through the separating conveyer 9006 and the like at intervals of the respective inclined conveyers 9010 to reach the knitting conveyer 9020, and is knitted by a stopper 9030 into an aggregate of 5 rows, and then loaded by the article feeding device 8000. It is arranged to be placed in the alignment container C in an arrangement of 4 rows × 5 columns. That is, even if only the same type of products Ga are loaded, the different types of products G can be loaded by taking out the same types of products Ga from the five tributary conveyors 1a, 2a, 3a, 4a, and 5a at substantially the same time. As in the case of just arranging just the items, it is possible to perform the arranging at high speed.

Further, only the articles G of different types, for example, the articles Ga, Gb, Gc, Gd and Ge are in the first row, the articles Gf, Gg, Gh, Gi and Gj are in the second row and the articles are in the third row. Gk, Gl, Gm, Gn, Go in the fourth row, the articles Gp,
Explaining the case where Gq, Gr, Gs, and Gt are sorted, that is, 20 types of articles G are sorted in 4 rows × 5 columns, the article Ga is at the top of the first-stage mainstream conveyor 7002 from the bottom. From the second main stream conveyor 7002 to the top, the article Gc to the top of the third main stream conveyor 7002 from the bottom, and the article Gc to the fourth main stream conveyor 7002 from the bottom
The article Gd is at the head of the
Each of the articles G is unloaded from the tributary conveyors 1a, 2b, 3c, 4d, and 5e so that the articles Ge are aligned at the top of 02, and the articles Ga, Gb, Gc, Gd, and
Ge is loaded. Next, the article Gf is on the first-stage main conveyor 7002 from the bottom, the article Gg is on the second-stage main conveyor 7002 from the bottom, and the article Gh is on the third-stage main conveyor 7002 from the bottom. The article Gi is on the fourth-stage mainstream conveyor 7002, and the article Gj is on the fifth-stage mainstream conveyor 7002 from the bottom.
Each article G is unloaded from the tributary conveyors 1f, 2g, 3h, 4i, 5j so as to be loaded at the second position on 02, and the articles Gf, Gg, Gh, Gi,
Gj is sorted. Next, the article Gk is on the first-stage mainstream conveyor 7002 from the bottom, the article Gl is on the second-stage mainstream conveyor 7002 from the bottom, and the article Gm is on the third-stage mainstream conveyor 7002 from the bottom. The article Gn is on the fourth-stage mainstream conveyor 7002, and the article Go is on the fifth-stage mainstream conveyor 7002 from the bottom.
Each article G is unloaded from the tributary conveyors 1k, 2l, 3m, 4n, 5o so as to be loaded in the third position on 02, and the articles Gk, Gl, Gm, Gn,
Go is packed. Next, the article Gp is placed on the first-stage mainstream conveyor 7002 from the bottom, the article Gq is placed on the second-stage mainstream conveyor 7002 from the bottom, and the article Gr is placed on the third-stage mainstream conveyor 7002 from the bottom. The article Gs is on the fourth-stage mainstream conveyor 7002, and the article Gt is on the fifth-stage mainstream conveyor 7002 from the bottom.
Each article G is unloaded from the tributary conveyors 1p, 2q, 3r, 4s, 5t so as to be loaded in the fourth position on 02, and the articles Gp, Gq, Gr, Gs,
Gt is loaded. That is, the articles Ga, Gf, Gk, and Gp are arranged in this order on the first-stage mainstream conveyor 7002 from the bottom.
The articles Gb, G are provided on the mainstream conveyor 7002 on the second stage from the bottom.
g, Gl, and Gq in the order of articles Gc, Gh, Gm, and Gr on the mainstream conveyor 7002 at the third stage from the bottom, and articles Gd, G on the mainstream conveyor 7002 at the fourth stage from the bottom.
In the order of i, Gn, and Gs, the mainstream conveyor 7002 at the fifth stage from the bottom is loaded with the articles Ge, Gj, Go, and Gt in this order, and the 20 loaded articles G are loaded with the separation conveyor 9006. After that, each inclined conveyor 9010 is conveyed at intervals and reaches the knitting conveyor 9020, and after being knitted by a stopper 9030 into a group of 5 rows, the article loading device 8000 puts it into four rows in the load-aligning container C. It is put in a × 5 row arrangement.

Next, 20 articles G of the same kind but different kinds in the rest are arranged in the first packing container C in 4 rows × 5 columns, and in the second packing container C as well. A case will be described in which 20 articles G of the same kind as the part and different kinds as the rest are sorted in a 4 × 5 column. For example, as the article G to be loaded into the first loading container C, the article G in the first row
a, Gd, Gd, Gf, Gg in the second row, the articles Gg, G
h, Gj, Gj, Gl in the third row, the articles Gr, Gr, G
r, Gr, Gr in the 4th row, articles Gr, Gs, Gt, G
Items g, Ga, Gb, and
Gd and Ge are in the sixth row and the articles Ge, Gg, Gh, Gk,
Gk in the 7th row, Gl, Gm, Gp, Gr, Gs
When the articles Gs, Gt, Gy, Gz, and Gz are to be lined up in the 8th row, the mainstream conveyor 7002 at the first stage from the bottom.
The article Ga is at the head of the
02, the article Gd at the head of the third-stage mainstream conveyor 7002 from the bottom, the article Gf at the beginning of the fourth-stage mainstream conveyor 7002 from the bottom, and the article Gd at the fifth-stage mainstream conveyor 7002 from the bottom. The articles G are distributed to the leading conveyors 1a, 2d, 3d, so that the articles Gg are aligned at the top.
4f and 5g are carried out, and the articles Ga, Gd,
Gd, Gf, and Gg are loaded. Next, the article Gg is placed on the first-stage mainstream conveyor 7002 from the bottom, the article Gh is placed on the second-stage mainstream conveyor 7002 from the bottom, and the article Gj is placed on the third-stage mainstream conveyor 7002 from the bottom. The articles Gj are loaded on the fourth-stage mainstream conveyor 7002, and the articles Gl are loaded on the fifth-stage mainstream conveyor 7002 so that the articles Gl are aligned at the second position on the respective mainstream conveyors 7002. Tributary conveyors 1g, 2h, 3j,
4j and 5l, and articles Gg, Gh,
Gj, Gj, and Gl are loaded. Next, the article Gr is on the first-stage mainstream conveyor 7002 from the bottom, the article Gr is on the second-stage mainstream conveyor 7002 from the bottom, the article Gr is on the third-stage mainstream conveyor 7002 from the bottom, The articles Gr are loaded on the fourth-stage mainstream conveyor 7002 and the articles Gr on the fifth-stage mainstream conveyor 7002 so that the articles Gr are aligned at the third position on the respective mainstream conveyors 7002. Tributary conveyors 1r, 2r, 3r,
4r and 5r are carried out, and articles Gr, Gr,
Gr, Gr, Gr are loaded. Next, the article Gr is on the first-stage main conveyor 7002 from the bottom, the article Gs is on the second-stage main conveyor 7002 from the bottom, the article Gt is on the third-stage main conveyor 7002 from the bottom, and the article Gt is from the bottom. The articles Gt are loaded on the fourth-stage mainstream conveyor 7002, and the articles Gy are loaded on the fifth-stage mainstream conveyor 7002 so that the articles Gy are aligned at the fourth position on the respective mainstream conveyors 7002. Tributary conveyors 1r, 2s, 3t,
4t and 5y are carried out and articles Gr, Gs,
Gt, Gt, and Gy are loaded. Next, the article Ga is on the first-stage main conveyor 7002 from the bottom, the article Ga is on the second-stage main conveyor 7002 from the bottom, and the article Gb is on the third-stage main conveyor 7002 from the bottom. The article Gd is loaded on the fourth-stage mainstream conveyor 7002, and the article Ge is loaded on the fifth-stage mainstream conveyor 7002 from the bottom so that the articles G are aligned at the fifth position on the respective mainstream conveyor 7002. Tributary conveyors 1a, 2a, 3b,
4d and 5e are carried out, and articles Ga, Ga,
Gb, Gd, and Ge are loaded. Next, the article Ge is on the first-stage main conveyor 7002 from the bottom, the article Gg is on the second-stage main conveyor 7002 from the bottom, the article Gh is on the third-stage main conveyor 7002 from the bottom, and The articles Gk are loaded on the fourth-stage mainstream conveyor 7002, and the articles Gk are placed on the fifth-stage mainstream conveyor 7002 so that the articles Gk are aligned at the sixth position on the respective mainstream conveyors 7002. Tributary conveyors 1e, 2g, 3h,
4k and 5k are carried out, and in the 6th row, the articles Ge, Gg,
Gh, Gk, and Gk are sorted. Next, the article Gl is on the first-stage mainstream conveyor 7002 from the bottom, the article Gm is on the second-stage mainstream conveyor 7002 from the bottom, the article Gp is on the third-stage mainstream conveyor 7002 from the bottom, and The article Gr is loaded on the fourth-stage mainstream conveyor 7002 and the article Gs is loaded on the fifth-stage mainstream conveyor 7002 at the seventh position on each mainstream conveyor 7002. Tributary conveyors 1l, 2m, 3p,
4r and 5s, and in the 7th row, articles Gl, Gm,
Gp, Gr, and Gs are loaded. Next, the article Gs is placed on the first-stage mainstream conveyor 7002 from the bottom, the article Gt is placed on the second-stage mainstream conveyor 7002 from the bottom, and the article Gy is placed on the third-stage mainstream conveyor 7002 from the bottom. The articles Gz are loaded on the fourth-stage mainstream conveyor 7002, and the articles Gz are placed on the fifth-stage mainstream conveyor 7002 so that the articles Gz are aligned at the eighth position on the respective mainstream conveyors 7002. Tributary conveyors 1s, 2t, 3y,
4z and 5z are carried out, and articles Gs, Gt,
Gy, Gz, and Gz are loaded. That is, the articles Ga, Gg, Gr, G are provided on the first-stage mainstream conveyor 7002 from the bottom.
In the order of r, Ga, Ge, Gl, and Gs, the articles Gd, Gh, Gr, and G are placed on the second main stream conveyor 7002 from the bottom.
In the order of s, Ga, Gg, Gm, and Gt, the articles Gd, Gj, Gr, and G are placed on the main stream conveyor 7002 at the third stage from the bottom.
In the order of t, Gb, Gh, Gp, and Gy, the articles Gf, Gj, Gr, and G are placed on the fourth-stage mainstream conveyor 7002 from the bottom.
In the order of t, Gd, Gk, Gr, and Gz, articles Gg, Gl, Gr, and G are placed on the main stream conveyor 7002 at the fifth stage from the bottom.
Of the 40 articles G that have been packed in the order of y, Ge, Gk, Gs, and Gz, the 20 articles G that have been packed in the first row to the fourth row are the separation conveyor 9006 and the like. After that, the inclined conveyers 9010 are conveyed at intervals and reach the knitting conveyer 9020, and the stopper 90
After it is knitted into a set of 5 rows by 30, it is placed in the first loading container C by the article input device 8000.
Twenty articles G loaded in a row × 5 column arrangement and arranged in the 5th to 8th rows are also knitted into an aggregate consisting of 5 rows, and then 4 rows are arranged in the second loading container C. It is put in a × 5 row arrangement.

Next, the order as described above, that is, the articles Ga,
When the articles G are loaded on the first-stage mainstream conveyor 7002 from the bottom in the order of Gg, Gr, Gr, Ga, Ge, Gl, and Gs, the articles G placed on the respective tributary conveyors 7001 are How to take out the mainstream conveyor 7002 and join the mainstream conveyor 7002 will be described.

On the first main stream conveyor 7002 from the bottom,
An extra space 20 that is constant in the length dimension (300 mm) of the article G
When a virtual space of 500 mm in which 0 mm is added is set, the eight articles G are taken out into the space, and there is a load alignment command to convey at a pitch of 500 mm, a pulse encoder attached to the mainstream conveyor 7002. 7
Since 023 generates one pulse for 1 mm movement of the mainstream conveyor 7002, by counting this pulse with a pulse counter (not shown), the mainstream conveyors 1a, 1b ,. At the timing when the position is corrected, the respective articles G are taken out on the mainstream conveyor 7002 at a predetermined pitch and in order, and the articles are aligned.

That is, the mainstream conveyor 700 at the first stage from the bottom
2, the tributary conveyors 1a, 1b, ...
・ If the 1z arrangement interval is 400 mm, for example,
The distance between the most upstream (26th) tributary conveyor 1z and the tributary conveyor 1a is 400 mm × (26-1) = 10000.
mm, which is the final end of the first-stage mainstream conveyor 7002 from the bottom, that is, the article Ga that should first reach the separation conveyor 9006 is placed on the tributary conveyor 1a, and delayed by 10,000 pulses from the start of load alignment. The article Ga may be carried out from the tributary conveyor 1a. That is, the position correction value of the tributary conveyor 1a or the article Ga is 10,000 pulses after the start of the load alignment, and 10000 pulses after the start of the load alignment.
The article take-out device 70 is provided at the tip of the tributary conveyor 1a so as to take out the article Ga from the tributary conveyor 1a to the main stream conveyor 7002 after the pulse.
03. The final end, that is, the separation conveyor 9
The article Ga that should first reach 006 is the mainstream conveyor 70.
Since No. 02 is carried at the beginning, the carry-out timing based on the carrying order is 0 pulse.

The article Gg that should reach the final end of the mainstream conveyor 7002 next to the article Ga is carried out from the tributary conveyor 1g and set on the mainstream conveyor 7002.
Are packed in the virtual space 500 mm upstream from the virtual space. That is, the distance between the most upstream tributary conveyor 1z and the seventh tributary conveyor 1g is 400 mm × (26-7)
= 7600 mm, 1 g of tributary conveyor or article G
The position correction value of g is 7600 pulses. In addition, since the conveyance interval with the article Ga which reaches the final end first is 500 mm, 500 pulses are added to 7600 pulses to obtain 8
An article take-out command is given to the article take-out device 7003 provided at the tip of the tributary conveyor 1g so as to take out the article Gg from the tributary conveyor 1g to the main stream conveyor 7002 after 100 pulses.

The article Gr that should reach the final end of the mainstream conveyor 7002 next to the article Gg is carried out from the tributary conveyor 1r and set on the mainstream conveyor 7002.
Is packed in the virtual space on the upstream side by 1000 mm from the virtual space. That is, the distance between the most upstream tributary conveyor 1z and the eighteenth tributary conveyor 1r is 400 mm × (26−
18) = 3200 mm, and the position correction value of the tributary conveyor 1r or the article Gr is 3200 pulses. Also,
The conveyance interval with the article Ga which reaches the final end first is 100
Since it is 0 mm, an article take-out command is given to the article take-out device 7003 provided at the tip of the tributary conveyor 1r so as to take out the article Gr from the tributary conveyor 1r to the main stream conveyor 7002 after 4200 pulses obtained by adding 1000 pulses to 3200 pulses. To be

After the above-mentioned article Gr, the article Gr of the same type reaches the final end of the mainstream conveyor 7002, and the article Gr.
Is also carried out from the tributary conveyor 1r, and the mainstream conveyor 700
1500 mm from the virtual space of the article Ga set on 2
It is packed only in the virtual space on the upstream side. That is, since the conveyance interval with the article Ga that reaches the final end first is 1500 mm, the article take-out command is issued to take out the article Gr from the tributary conveyor 1r to the main stream conveyor 7002 after 4700 pulses obtained by adding 1500 pulses to 3200 pulses. It is given to the article take-out device 7003 provided at the tip of the tributary conveyor 1r.

The article Ga that should reach the final end of the mainstream conveyor 7002 next to the article Gr is unloaded from the tributary conveyor 1a and set on the mainstream conveyor 7002 first to reach the final end of the mainstream conveyor 7002. The load is aligned in the virtual space on the upstream side of 2000 mm from the Ga virtual space. That is, since the conveyance interval with the article Ga which reaches the final end first is 2000 mm, the article take-out command is issued to take out the article Ga from the tributary conveyor 1 a to the main stream conveyor 7002 after 12000 pulses obtained by adding 2000 pulses to 10000 pulses. It is given to the article take-out device 7003 provided at the tip of the tributary conveyor 1a.

The article Ge which should reach the final end of the mainstream conveyor 7002 next to the article Ga is carried out from the tributary conveyor 1e and set on the mainstream conveyor 7002 first to reach the final end of the mainstream conveyor 7002. The load is aligned in the virtual space on the upstream side of 2500 mm from the Ga virtual space. That is, the distance between the uppermost tributary conveyor 1z and the fifth tributary conveyor 1e is 400 mm × (26−5) =
8400 mm, tributary conveyor 1e or article Ge
The position correction value is 8400 pulses. Further, since the conveyance interval with the article Ga which reaches the final end first is 2500 mm, the article take-out command is issued to take out the article Ge from the tributary conveyor 1e to the main stream conveyor 7002 after 10900 pulses obtained by adding 2500 pulses to 8400 pulses. It is given to the article take-out device 7003 provided at the tip of the tributary conveyor 1e.

The article Gl which should reach the final end of the mainstream conveyor 7002 next to the article Ge is carried out from the tributary conveyor 1l and set on the mainstream conveyor 7002 to reach the final end of the mainstream conveyor 7002 first. The load is aligned in the virtual space on the upstream side of 3000 mm from the Ga virtual space. That is, the distance between the most upstream tributary conveyor 1z and the twelfth tributary conveyor 1l is 400 mm × (26-1
2) = 5600 mm, and the position correction value of the tributary conveyor 1l or the article Gl is 5600 pulses. Further, the conveyance interval with the article Ga which reaches the final end first is 3000
mm, it is 8600 pulses after adding 3000 pulses to 5600 pulses.
An article take-out command for taking out 1 to the mainstream conveyor 7002 is given to the article take-out device 7003 provided at the tip of the tributary conveyor 1l.

The article Gs which should reach the final end of the mainstream conveyor 7002 next to the article Gl is carried out from the tributary conveyor 1s and set on the mainstream conveyor 7002 to reach the final end of the mainstream conveyor 7002 first. The load is aligned in the virtual space 3500 mm upstream of the Ga virtual space. That is, the distance between the most upstream tributary conveyor 1z and the 19th tributary conveyor 1s is 400 mm × (26-1
9) = 2800 mm, and the position correction value of the tributary conveyor 1s or the article Gs is 2800 pulses. Further, the conveyance interval with the article Ga which reaches the final end first is 3500.
Since it is mm, after 6300 pulses obtained by adding 3500 pulses to 2800 pulses, the article G is transferred from the tributary conveyor 1s.
An article take-out command is given to the article take-out device 7003 provided at the tip of the tributary conveyor 1s so as to take out s to the main stream conveyor 7002.

Although the method of arranging the articles G to be loaded into one or two arranging containers C has been described above, the arranging of a large number of arranging containers C can be continuously and successively performed. Needless to say.

When the articles G are loaded on the mainstream conveyor 7002, which is the second to fifth stages from the bottom, the position correction value and the conveyance interval are calculated in the same manner, and each of them is determined at a predetermined timing. Tributary conveyor 7001 to mainstream conveyor 7
It is controlled to carry out the article G to 002.

Further, the articles G, which are loaded and arranged at intervals for each main stream conveyor 7002, are inclined conveyor 90.
Each mainstream conveyor 70 for transporting up to 10
Downstream of 02, a separation (belt) conveyor 9006 at a speed of about 96 m / min, left 90 ° at a speed of about 42 m / min
A roller curve conveyor, a linear belt conveyor having a speed of approximately 42 m / min, a right 90 ° roller curve conveyor having a speed of approximately 42 m / min, and a linear belt conveyor having a speed of approximately 42 m / min are provided. It should be noted that the articles G to be the heads in the respective rows of the aggregate consisting of a plurality of rows are almost at the same time at the end of the inclined conveyor 9010, that is, the knitting conveyor 9020.
To reach the upstream end of the mainstream conveyor 7002, the speeds of the conveyors provided downstream of the mainstream conveyor 7002 are set to be different for each row, or the mainstream conveyors 7002 are provided with the tributary conveyors 702.
It is preferable to correct the carry-out timing from 01.

Thus, the articles G joined from the plurality of tributary conveyors 7001 to the respective mainstream conveyors 7002 at a predetermined pitch and in order and continuously conveyed on the mainstream conveyor 7002 pass the position of the detector 7021. The deviation amount x between the planned pulse value and the actual pulse value at which the article G has passed the position of the detector 7021 is obtained, and the deviation amount x is statistically processed for each tributary conveyor 7001 and the variation b is set in advance. The presence or absence of the maintenance work is determined by comparing it with the determination reference value d.

That is, FIG. 11 is a block diagram showing an embodiment of a control system suitable for carrying out the preventive maintenance method of the present invention.
Reference numeral 081 denotes a computer that determines whether maintenance work is necessary, 9082 denotes a system control panel including a sequencer, and the computer 9081 groups the articles G that are continuously conveyed on the mainstream conveyor 7002 into groups of four,
The leading article G of each group will pass through the position of the detector 7021 (the pulse encoder 7023
System control board 908 using the pulse value as the reference pulse
2 is instructed in advance. System control panel 9082
The second to fourth articles G are scheduled to pass the position of the detector 7021 (of the pulse encoder 7023) based on the above-mentioned reference pulse. The pulse value is the reference pulse and the next reference pulse is a constant pitch (500 pulses). The calculation is performed by dividing by
Pulse encoder 7023 when passing position 1
The average value of the rising pulse value and the falling pulse value of the
As the actual pulse value that has passed the position 021, the deviation amount x between the expected pulse value that each article G passes the position of the detector 7021 and the actual pulse value that each article G has passed the position of the detector 7021. Calculate It should be noted that the deviation amount x is represented by adding a sign of ± depending on whether the article G passed behind or passed earlier. Then, the system control panel 9082 transfers the data of the shift amount x represented by the sign of ± to the computer 9081. The computer 9081 saves the transferred data of the shift amount x as raw data for one day in time series. Further, the computer 9081 classifies the data of the deviation amount x stored for one day in time series for each tributary conveyor 7001 and statistically processes the deviation amount x classified for each tributary conveyor 7001. Each tributary conveyor 7
The average value a, the standard deviation σ, the maximum value of the deviation amount x for each 001,
A total deviation amount value c (a + 3σ) obtained by calculating the minimum value and adding the variation b (three times the standard deviation σ) to the average value a.
Is calculated and stored as a daily report. Also, the computer 9081 accumulates daily reports for one month to create a monthly report and saves it.

Therefore, each tributary conveyor 70
How the average value a, standard deviation σ, maximum value, minimum value, variation b, and total deviation amount value c of the deviation amount x for each 01 change, for example, after one month, three months, six months, and one year You can observe what you are doing. That is, the maintenance work is performed by comparing the variation b accumulated as a monthly report for each month with a preset judgment reference value d (40 alarms or more and less than 55 pulses is “alert” and 55 pulses or more is “dangerous”). It is designed to determine whether or not there is a need, and the variation b is 40
If it is less than the pulse, it is determined that maintenance work is not necessary,
If the number of pulses is 40 pulses or more and less than 55 pulses, it is determined as "warning", and the air cylinder 7032, the speed controller and the like of the article take-out device 7003 are adjusted and preparations for replacement are prepared. If the number of pulses is 55 pulses or more, it is determined as "danger", and the preventive maintenance work is performed by adjusting or replacing the air cylinder 7032, the speed controller, etc. of the article take-out device 7003. Instead of comparing the variation b accumulated as the monthly report with the preset determination reference value d, for example, the variation b accumulated as the daily report of the last day of the month is compared with the preset determination reference value d. Then, it may be determined whether maintenance work is necessary. The determination reference value d may be set appropriately according to the size of the article G and the virtual space (margin space). When the virtual space of 700 mm is set for the article G of 300 mm, 90 pulses or more and less than 105 pulses are set. The judgment reference value d may be set by setting “Caution” as “Valid” and 105 pulses or more as “Danger”.

Further, it is possible to analyze the cause of the trouble that occurred on that day by using the data of the deviation amount x stored as raw data for one day in time series. That is, it is possible to identify the tributary conveyor 7001 in which the trouble has occurred and to know the deviation amount x at that time. Note that the computer 9081 can accumulate weekly reports by accumulating daily reports for one week, and can also accumulate and accumulate monthly reports for 12 months to create and store annual reports. It is also possible to determine whether or not maintenance work is necessary by using the data of.

In FIG. 5, the knitting conveyor 9020 is shown in FIG.
1 is different from that shown in FIG. 1, but the other points are the inclined conveyor 9010, the knitting conveyor 9020, and the stopper 90 shown in FIG.
FIG. 30 is an enlarged perspective view substantially the same as 30 etc.
Numeral 10 is a belt conveyor having a speed of about 42 m / min, which is arranged in five rows corresponding to the mainstream conveyor 7002, and the respective inclination angles are different. Also, the knitting conveyor 90
20 is about 4 installed on the downstream side of the inclined conveyor 9010.
A belt conveyor having a speed of 5 m / min, having a belt width corresponding to five rows of inclined conveyors 9010, and a side composed of a pair of rotating endless round belts 9211 for moving the articles G in a plurality of rows. Equipped with a guide 9021,
The pair of endless round belts 9211 are attached to each other on the downstream side so that the articles G can be kept close to each other. Further, the stopper 9030 is a rocking roller conveyor having a speed of about 67 m / min, which is arranged on the upstream side of the article supply conveyor 8002 of the article feeding device 8000 described later and on the downstream side of the knitting conveyor 9020. , An air cylinder (not shown) is configured to swing about the downstream end as a fulcrum, and a plurality of rows of articles G conveyed on the knitting conveyor 9020 at the upstream end of the swing roller conveyor 9030 can be stopped. Is configured. Numeral 9022 is a photoelectric switch for detecting passage of articles G conveyed at intervals in each row, and five photoelectric switches are provided above the upstream end of the knitting conveyor 9020 so as to correspond to each row.

Thus, each inclined conveyor 9010
Each of them is conveyed at intervals and further knitting conveyor 9020
In a plurality of rows of articles G conveyed above each row with an interval, the article G to be the head in each row of the aggregate consisting of a plurality of rows, and the respective rows of the preceding aggregate The article G to be the last is separated by raising the upstream end of the rocking roller conveyor 9030, and then the upstream end of the rocking roller conveyor 9030 is lowered to separate the articles G from a plurality of rows. It is designed to be organized into a collection.

Hereinafter, the articles G having a length of 300 mm are provided at substantially constant pitches, for example, 0.
The knitting conveyor 90 is conveyed at intervals of 5 seconds.
After reaching 20 and knitting into an assembly of 30 articles G consisting of 5 rows, as shown in FIG.
A description will be given based on an embodiment in which a 5-row array is used. The articles G that have reached the knitting conveyor 9020 are further conveyed on the knitting conveyor 9020 at intervals for each row, and the five articles G placed in the width direction rotate in the same direction as the knitting conveyor 9020. Endless round belt 92 that moves
The side guide 9021 composed of 11 conveys the sheet in the direction of the rocking roller conveyor 9030 while keeping the width.
The photoelectric switch 9022 provided at the upstream end of the knitting conveyor 9020 so as to correspond to each of the inclined conveyors 9010 continues to detect that the articles G in the corresponding row pass one after another (FIG. In 7, 1
Photoelectric switch 90 corresponding to each inclined conveyor 9010
Only 22 operations are shown).

When any of the five photoelectric switches 9022 provided so as to correspond to the respective inclined conveyors 9010 detects the passage of the article G which reaches the knitting conveyor 9020 at the head, the interrupt mask is turned on. And the oscillating roller conveyor 903 after a delay of a predetermined time T1.
The upstream end of 0 is further raised, and the upstream end of the rocking roller conveyor 9030 is further lowered with a delay of T2 for a certain period of time.
The article G that reaches 20 at the top is the swing roller conveyor 90.
It is temporarily stopped at the raised upstream end portion of 30 to absorb the difference in arrival time for each row, and the leading articles G in each row are aligned in a horizontal row, to the article supply conveyor 8002 described later. By being transported, it is knitted into an aggregate consisting of a plurality of rows. In the present embodiment, T1 is 0.1 second less than the time required for the article G to reach the upstream end of the rocking roller conveyor 9030 from the position of the photoelectric switch 9022,
Since T2 is set to 0.3 seconds, the separation conveyor 900
First, the knitting conveyor 9 occurs at the beginning, which is caused by slipping of 6 or the like.
If the difference in arrival time between the article G reaching 020 and the article G arriving at the head of the knitting conveyor 9020 in another row is within 0.2 seconds, the top article G in each row is aligned in one horizontal row. be able to.

The leading article G forming the next aggregate reaches the knitting conveyor 9020 because, in calculation, the leading article G forming the previous aggregate reaches the knitting conveyor 9020. Since it is 3 seconds (0.5 second pitch x 6) later, 2.8 seconds after 0.2 second (at this time,
The photoelectric switch 9022 detects the sixth article G) and turns off the interrupt mask, and waits for the leading article G forming the next aggregate to reach the knitting conveyor 9020. After the interruption mask is turned off, when any of the five photoelectric switches 9022 provided so as to correspond to the respective inclined conveyors 9010 detects passage of the article G which reaches the knitting conveyor 9020 at the head,
The interrupt mask is turned on again and T1
The upstream end of the oscillating roller conveyor 9030 is raised with a delay, and the oscillating roller conveyor 9 is further delayed with a predetermined time T2.
The upstream end of 030 is lowered so that the articles G in a plurality of rows are knitted into an aggregate including a plurality of rows. That is, the upstream side of the articles G that have reached the knitting conveyor 9020 at the beginning after the interruption mask is turned off is controlled to be the next aggregate.

Also, after the interrupt mask is turned on, the container forced transfer device 8012 of the article inputting device 8000, which will be described later, is driven at a high speed momentarily from the stopped state with a delay of T3 for a predetermined time, and then immediately switched to a low speed. It is designed to be used. Note that T3 is the time from the arrival of the first article G forming the next group to the knitting conveyor 9020 until the completion of loading all the articles G forming the previous group into the load-alignment container C. .

Further, FIG. 8 is a loading device 8 for articles shown in FIG.
000 is an enlarged perspective view of FIG. 000, and FIG. 9 is an explanatory diagram of the operation of the article inputting device 8000 shown in FIG. 8, in which 8001 is configured to convey the container C in a tilt direction (substantially vertical), In addition, a pair of container transport chutes 8011 and a pair of container transport chutes 8 that are inclined and arranged in a container transport conveyor including an endless rotary body with a claw that is driven at two transport speeds.
Forcibly-conveying container 8012 in which six claws 8122 are attached to a pair of endless rotating bodies 8121 arranged between 011.
A pair of container regulation guides 8013 arranged above the pair of container transport chutes 8011, a transmission device 8014 (not shown) including an inverter, and the like are provided, and the transmission device 8014 sets the endless rotating body 8121 to two preset transport speeds. It is configured to be capable of shifting. Further, reference numeral 8002 denotes an article supply conveyor configured to load the article G in a direction substantially parallel to the front wall C1 of the container C conveyed by the container conveyance conveyor 8001.
The articles G discharged from the front wall C1 of the container C by gravity.
It is an inclined belt conveyor arranged so that it can be put in a direction substantially parallel to. Reference numeral 8003 denotes a container carry-in conveyor formed of a belt conveyor, and 8004 denotes a container carry-out conveyor formed of a belt conveyor. Thus, a plurality of rows of articles G, which are conveyed at intervals for each of the inclined conveyors 9010 and are further conveyed on the knitting conveyor 9020 at intervals of each row, of an assembly composed of a plurality of rows. The article G to be the first in each row and the article G to be the last in each row of the preceding assembly are separated by raising the upstream end of the rocking roller conveyor 9030 and then shaken. Moving roller conveyor 9030
Is knitted into a group consisting of a plurality of rows by lowering the upstream end of the knitted article, and the knitted articles G are loaded into the container C moving downward at a stacking speed substantially equal to the moving speed of the container C, and the article G is The containers C are arranged so as to be stacked so as to be aligned, and the container C in which the articles G are inserted and the next container C are temporarily stopped, and then the next container C is being inserted. The container C is moved at a speed higher than the moving speed of the container C to a position where the article G can be loaded.

That is, as shown in FIG. 9, a length of 300 mm and a thickness of 50 m are placed on the article supply conveyor 8002 at a substantially constant pitch, for example, 0.5 rows at a pitch of 5 rows each.
The product G of m is stored in the container C by the product supply conveyor 8002.
Move in the direction. On the other hand, the container C is a container carry-in conveyor 80.
03 are sequentially supplied to the container transfer chute 8011, slide on the container transfer chute 8011, and are supplied to the container forced transfer device 8012. It should be noted that FIG. 9 shows an embodiment in which an article G knitted in 4 rows × 5 columns is put into a container C. Further, when the container C is transferred from the container transfer chute 8011 to the container forced transfer device 8012 (see FIG. 9A), the container forced transfer device 8012 is driven at a low speed.

As will be described later, the container C transferred to the container forced transfer device 8012 is transferred at a low speed in synchronism with the transfer of the container C in which the article G is being loaded, and then temporarily stopped and further moved to a higher position. After being conveyed at the speed, the low-speed conveyance, the temporary stop, and the high-speed conveyance are repeated again so that the article G is moved to the position where it is loaded.

When the container C is moved to the article loading start position, the carrying speed of the container forced carrying device 8012 is switched from the high speed to the low speed, and five articles G are continuously fed by the article feeding conveyor 8002. The articles G are loaded so as to be piled up in the container C moving downward at a low speed, and the loaded articles G are stored in the container C in an aligned state. Incidentally, the article G
The transfer speed of the container forced transfer device 8012 when a container is loaded into the container C, that is, the moving speed of the container C is
Stacking speed of 50 mm / 0.5 in this embodiment
It is set equal to or slightly faster than second = 6 m / min, for example, 6 to 7 m / min. However, when the fourth-stage article G is loaded into the container C, the container forced transfer device 801
2 is stopped. That is, when the container C arrives at the position where the final article G is loaded, the claw 812 attached to the endless rotating body 8121 by the detector arranged at the predetermined position.
2 is detected, the container forced transfer device 8012 is temporarily stopped,
Wait until the final article G is completely loaded (FIG. 9B).
reference).

When the final article G is placed in the container C, the container forced transfer device 8012 is driven at a high speed, and the article G forming the next aggregate continuously supplied by the article supply conveyor 8002. To a position (see FIG. 9C) at which the container can be loaded slightly above the front wall C1 of the next container C.
After being transported, the transport speed of the container forced transport device 8012 is switched from the high speed to the low speed, and the articles G are sequentially loaded into the next container C as described above. FIG. 10 is an explanatory diagram showing an example of the shifting state of the transport speed of the container forced transport device 8012. When the final article G is loaded into the container C, the container forced transport device 8012 is momentarily raised from the stopped state. It is driven at speed and can be immediately switched to low speed.

The container C loaded with the article G is released from the container forced transfer device 8012, and the container transfer chute 80 is again used.
It slides on 11 (see FIG. 9D), and is sent to the next step through a container unloading conveyor 8004 (see FIG. 9E).
When the container C is changed from the inclined state to the horizontal state, the 20 articles G put in the container C are arranged in a standing state from a stacked state.

Although the preventive maintenance method of the present invention has been described above with the embodiment of the article assembling equipment suitable for its implementation, the preventive maintenance method of the present invention is not limited to these. For example, the variation compared with the determination reference value d may be the standard deviation σ, the variance, or the like.

Further, the size of the article G may be different for each kind.

Further, all the scheduled pulse values may be set by the computer 9081.

The pulse encoder 7023 may be provided for each main stream conveyor 7002.

[0052]

Since the preventive maintenance method of the present invention is configured as described above, it is necessary to determine the deviation amount between the planned pulse value and the actual pulse value, statistically process the deviation amount, and determine whether the maintenance work is necessary. Therefore, it is possible to observe the degree of wear and the like of the equipment (conveyor, article take-out device, etc.) over time and preventively perform the adjustment work and replacement work of the wear parts.

[Brief description of drawings]

FIG. 1 is a perspective view showing one embodiment of an article packing apparatus.

2 is different from the article storage / loading apparatus shown in FIG. 1 in the number of rows of tributary conveyors and the arrangement of mainstream conveyors, but other points are substantially the same as those of the article storage / loading apparatus shown in FIG. It is a perspective view of an apparatus.

FIG. 3 is an enlarged perspective view of a tip portion of the tributary conveyor shown in FIG.

[Fig. 4] The tributary conveyor is 2 in the direction along the main conveyor.
It is an elevation view of a fluidized shelf which is formed by arranging a total of 130 in six rows and five stages in the vertical direction.

FIG. 5 is an enlarged perspective view substantially the same as the inclined conveyor, the knitting conveyor, the stopper, and the like shown in FIG. 1 except that the knitting conveyor is different from that shown in FIG. 1;

FIG. 6 is an explanatory diagram of operations of the inclined conveyor, the knitting conveyor, the stopper, and the like shown in FIG.

FIG. 7 is a time chart of the operation of the inclined conveyor, knitting conveyor, stopper, and the like shown in FIG. 6;

FIG. 8 is an enlarged perspective view of the article feeding device shown in FIG.

9 is an explanatory diagram of an operation of the article input device shown in FIG.

FIG. 10 is an explanatory diagram illustrating an example of a state of change in the transport speed of the container forced transport device.

FIG. 11 is a configuration diagram showing an embodiment of a control system suitable for implementing the preventive maintenance method of the present invention.

[Explanation of symbols]

 7001 tributary conveyor 7002 main stream conveyor 7021 detector G article x deviation amount

Claims (1)

[Claims] 1. A deviation amount between a scheduled pulse value at which an article merged from a plurality of tributary conveyors and conveyed on the mainstream conveyor passes the position of the detector and a pulse value of the actual pulse at which the article passes the position of the detector. It is configured to determine whether maintenance work is necessary by comparing the variation obtained by statistically processing the deviation amount for each tributary conveyor with a preset determination reference value. Characteristic preventive maintenance method.