JP2003072720A - Vertical bag-making and packaging machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vertical bag-making and packaging machine in which a variation in dropping time of an item is detected automatically, a reaching time of the item to a lateral seal starting point is detected more precisely and an inferior biting rate of the item to the lateral seal segment is not dependent on an operator's skill but reduced. SOLUTION: There is provided a vertical bag-making and packaging machine 1 in which a cylindrical packaging material F is applied with a lateral seal by a lateral seal device 15 and an item X dropping into a bag B is received while the bag is being formed, and filled. A control unit 10 detects a time t3 in which the item X reaches a lateral seal starting point P3 of the lateral seal device 15 in response to a time T1 ranging from a dropping start time t1 of the item X to a detecting time t2 of the item X while being dropped, changes a signal generating time of an item discharging request signal Sa against a metering machine control unit 20 or controls the lateral seal device 15 to change the lateral seal start time at the lateral seal start point P3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vertical bag-making packaging machine for packaging an article falling in a tubular packaging material with the packaging material, and more specifically, the article is caught in a horizontal seal portion of the packaging material. Belongs to the technical field of preventing.

[0002]

2. Description of the Related Art A vertical bag-making packaging machine is well known in which a packaging material bent in a tubular shape is sandwiched between a pair of sealing jaws and laterally sealed to form a bag, and articles falling into the bag are received and filled. Has been. In this packaging machine, it is important to prevent falling articles from getting caught in the lateral seal portion of the packaging material.

For example, in Japanese Unexamined Patent Publication No. 10-77002, the horizontal direction of the sealing jaws is set so that the horizontal packing is started in the downstream packaging machine after a certain time has elapsed from the time when the upstream weighing machine that discharges the weighed articles discharges the articles. A weighing and packaging system for controlling the sealing action is disclosed. In this technology, in order to deal with the fact that the article discharge interval of the weighing machine is not constant and varies, a detection means for detecting the discharge of the article from the weighing machine is provided, and the detection means actually discharges the article from the weighing machine. The packaging material is horizontally sealed after a certain period of time from the time of detection. In this case, the certain period of time is set to be slightly longer than the time required for the articles discharged from the weighing machine to be received by the tubular packaging material on the packaging machine side. In other words, after the article falling in the tubular packaging material is completely received by the previous horizontal seal portion, the next horizontal seal is performed above it without delay so that the article can be caught in the horizontal seal portion. In particular, it prevents the rear part of a group of falling bulky articles from being caught.

On the other hand, in Japanese Patent Laid-Open No. 11-321809, on the other hand, the time from the detection of an article by a sensor provided in the fall path of the article until the start of lateral sealing by the sealing jaws is also described by the sensor. There is disclosed a wrapping device that shortens the fall time required for the article to fall to a point before the lateral seal start point after the detection.
That is, by securely completing the next horizontal seal before the articles falling in the tubular packaging material reach the horizontal seal start point, the articles are caught in the horizontal seal portion, and particularly, the group of falling lumps The front part of the article is prevented from being caught.

[0005]

In any case, in order to prevent the falling article from being caught in the horizontal seal portion of the packaging material, the arrival time of the article at the horizontal seal start point is accurately detected. It is important to. Therefore, conventionally, as described in JP-A-11-321809, a predetermined point in the middle of the drop path (for example, a discharge port of a weighing machine or a discharge port of a weighing hopper of the weighing machine).
From the above to the horizontal seal start point, the drop time of the article is experimentally obtained for each article in advance, stored in a memory, and when the article is designated, the data of the drop time of the article is stored. It was read from the memory and used to detect the arrival time of the article at the horizontal seal start point.

However, there are various kinds of products to be packaged on the user side, and it is not rational to input the possible drop time of all possible products in advance, and a large amount of unnecessary data is required. Not good to use memory. Even for the same product, the drop time will gradually change due to differences in the usage environment of the packaging machine such as humidity and the physical properties of the product (moisture content, bulk specific gravity, shape or origin of raw materials, etc.) The arrival time at the starting point changes. Therefore,
If the same drop time data is used for the same article, there is a possibility that the timing of arrival of the article at the horizontal seal start point and the start of the horizontal seal at that point are deviated and biting occurs. This problem becomes more prominent and more frequent as the speed of the weighing and packaging system is increased, that is, the one cycle time is shortened. Therefore, in the present situation, a skilled operator finally finds out a slight change in the drop time of the article each time and adjusts the timing of the entire weighing and packaging system.

Therefore, the present invention automatically detects subtle fluctuations in the falling time of articles without resorting to a skilled operator,
(EN) Provided is a vertical bag making and packaging machine that accurately detects the time when an article reaches the horizontal seal start point, and thereby reduces the rate of defective biting of articles into the horizontal seal section without depending on operator skill. Is an issue.

[0008]

[Means for Solving the Problems] That is, the invention described in claim 1 of the present application is a vertical type product in which a tubular packaging material is laterally sealed to form a bag, and articles falling into the bag are received and filled. A bag wrapping machine comprising: a horizontal sealing means for performing the horizontal sealing; a drop start detecting means for detecting a fall start of an article; a fall article detecting means for detecting an article which is in the process of falling; Arrival time detection means for detecting the time when the article arrives at the lateral sealing start point of the lateral sealing means according to the time until the detection of the article on the way.

According to the present invention, the falling path of the article is the first half from the start of the falling of the article to the predetermined point on the way of the drop path, and the horizontal sealing of the tubular packaging material is started from the predetermined point. Considering separately the latter half up to the point, from the time required for the article to drop the first half, the time required to drop the remaining latter half is detected, and the latter half fall time, and The arrival time of the article at the horizontal seal start point can be detected from the predetermined point passage time.

For the purpose of merely observing fluctuations in the fall time of an article, for example, an article detection sensor or the like is provided in the vicinity of the lateral seal start point, and the time required for the article to drop to that point is directly measured. Just ask. However, there are many foreign matters in the vicinity of the horizontal seal start point, and it is not easy to arrange sensors. Also, installing a new sensor leads to an increase in cost. On the other hand, in the present invention, since the behavior of the second half of the article is detected based on the behavior of the first half of the fall of the article,
It is not necessary to provide new sensors in the latter half of the fall.

Further, in this case, since the arrival time at the horizontal seal start point is detected based on the actual dropping behavior of the article in the first half, the detection accuracy is good. For example, when the fall time of the first half is long, the fall time of the second half is long and the arrival time is delayed. On the contrary, when the fall time of the first half is short, the fall time of the second half is short and the arrival time is early. In this way, subtle fluctuations in the drop time of the article are automatically detected, and the arrival time of the article to the horizontal seal start point is accurately detected, and the rate of defective biting of the article into the horizontal seal is determined by the operator skill. Reduce without depending on.

Next, in the invention described in claim 2, in the invention described in claim 1, the falling article detecting means is
The article is arranged in the vicinity of a point where the free fall starts.

According to the present invention, the article does not fall freely in the first half of the fall, but falls (slides) while contacting a member such as a chute, and the second half of the fall does not contact any member. Then, it freely falls in a member such as a tube. In this case, since both the air resistance and the frictional resistance act on the article in the first half of the fall, the variation of the drop time for each article becomes relatively large, and the latter half of the fall has only the air resistance on the article. Since it works, the variation of the drop time for each article becomes relatively small. Then, the fall time of the first half portion where the variation is relatively large is actually detected, and the fall time of the second half portion where the variation is relatively small is detected based on the fall time of the first half portion, so the detection accuracy of the entire fall time is The result is that the detection accuracy of the arrival time of the article at the horizontal seal start point is improved.

Next, the invention according to claim 3 is the invention according to claim 1 or 2, wherein the fall start detecting means receives an article discharge signal from an upstream device for discharging the article. It is characterized by detecting the start of falling of.

According to the present invention, even when the fall time of the first half of the article is detected, the fall start of the article is detected without using, for example, the photoelectric cell type sensors for directly detecting the passage of the article. It is possible to further suppress the cost increase due to the installation of new sensors. The article discharge signal of the upstream device is transmitted in conjunction with the opening operation of the weighing hopper in the upstream device, for example.

Next, the invention according to claim 4 is, in the invention according to any one of claims 1 to 3, characterized in that a transmitting means for transmitting an article discharge request signal to an upstream device for discharging articles and the arrival Transmission time changing means for changing the transmission time of the signal based on the detection result of the time detection means.

According to the present invention, for example, when the arrival time of the article to the horizontal seal start point is late, an article discharge request signal to the upstream device is transmitted early to start the fall of the article in order to advance the arrival time. Speed up. On the contrary, when the arrival time of the article to the horizontal seal start point is early, in order to delay the arrival time, the article discharge request signal to the upstream device is transmitted late to delay the fall start of the article. In this way, the timing of the arrival of the article at the horizontal seal start point and the start of the horizontal seal at that point coincide with each other to prevent biting.

Next, the invention according to claim 5 is the invention according to any one of claims 1 to 3, wherein the horizontal sealing start time of the horizontal sealing means is based on the detection result of the arrival time detecting means. It is characterized by comprising a horizontal seal start time changing means for changing.

According to the present invention, for example, when the arrival time of the article to the horizontal seal start point is late, the horizontal seal start time is delayed in response to the arrival time. On the contrary, when the arrival time of the article to the horizontal seal start point is early, the horizontal seal start time is advanced in response to the arrival time. In this way, as in the case of the invention described in claim 4, biting is prevented by matching the timing of the arrival of the article at the lateral seal start point with the start of the lateral seal at that point.

Next, the invention according to claim 6 is the invention according to any one of claims 1 to 5, wherein the arrival time detection means is in the middle of a drop from the start of a plurality of past fall of articles. It is characterized in that the arrival time is detected based on the result of the time until the detection of the article.

According to the present invention, the arrival time is detected from the past drop results of the articles over a plurality of times, so that the detection accuracy is further improved. That is, when the number of sampled articles falling is small, the peculiarity of each sample is emphasized and is likely to appear, while when the number of sampled article falling is large, the peculiarities of individual samples are averaged and hidden.
Therefore, in the present invention, by taking samples of multiple drops in the past, such peculiarity is reduced even if, for example, the first half drop time is temporarily lengthened due to clogging of the drop path of the article. Thus, the behavior of the falling of the article close to the original can be obtained. Hereinafter, the present invention will be described in more detail through embodiments.

[0022]

BEST MODE FOR CARRYING OUT THE INVENTION [Mechanical Structure] As shown in FIG. 1, a vertical bag-making packaging machine 1 according to this embodiment comprises a weighing machine 2
Is arranged below the container and cooperates with the weighing machine 2 to form a weighing and packaging system. The weighing machine 2 measures the articles X such as potato chips dropped on the dispersion feeder 21 via the troughs 22 ... 22 and the pool hoppers 23.
24 are distributed and supplied. Then, here, the weight of each article X is measured using a weight detector (not shown) such as a load cell,
The calculated values are combined and calculated, and the weighing hoppers 24 ... 24 corresponding to the combination closest to the predetermined target weight are opened to open the article X.
… Discharge X. The discharged articles X ... X slide on a collecting chute 25, are collected in a lump by the chute 25, and are put into a tube 11 extending vertically in the packaging machine 1.

In the packaging machine 1, a long sheet-shaped packaging material f is bent into a tubular shape by a former 12, and the tubular packaging material F is formed into a tube 1.
1 side pull-down belts 13, 13 (of which 1
Vertical seal device 1 while pulling downward with only one shown)
The bag B is formed by vertically sealing at 4 and horizontally by the horizontal sealing device 15. The bag B is filled with the block-shaped article X put into the tube 11 from the weighing machine 2.

The wrapping machine 1 is of a continuous carrying type in which the packaging material F is carried downward even while the lateral sealing device 15 is performing lateral sealing. Therefore, the sealing jaw 1 of the lateral sealing device 15
5j and 15j move in a D shape in a side view. That is,
While the jaws 15j and 15j are swiveling in a vertical plane, the swivel center moves horizontally downward while the swivel center moves horizontally during a period in which the jaws 15j and 15j are in contact with each other with the packaging material F sandwiched therebetween (horizontal sealing period).

The control unit 20 of the weighing machine 2 is
Item X corresponding to the combination by opening the weighing hoppers 24 ... 24
When the X is discharged to the collecting chute 25, the hopper open signal Sb is transmitted. Control unit 1 of packaging machine 1
0 receives the hopper open signal Sb to detect the start of falling of the articles X ... X. The packaging machine control unit 10 further receives a falling article detection signal Sc from a sensor (for example, a photoelectric tube type) 16 provided on the way of the falling path of the article X, so that the article X ... Detect the passage of. The sensor 16 is arranged at a boundary point P2 between the weighing machine 1 and the packaging machine 2, more specifically, between the lower end of the collecting chute 25 and the upper end of the tube 11.

[Control Operation] The packaging machine control unit 10 takes time T1 from when the articles X ... X are discharged from the weighing hoppers 24. Accordingly, the articles X ... X are the lateral sealing start points (the sealing jaws 1 of the lateral sealing device 15).
Point 5P where 5j and 15j first contact each other with the packaging material F sandwiched therebetween P
The time t3 when reaching 3 is detected (calculated). Then, based on the result, the transmission time of the article discharge request signal Sa to the weighing machine control unit 20 is changed, or the lateral sealing device 15 is controlled to start the lateral sealing start point P.
Change the horizontal seal start time in 3.

(Detection of arrival time of articles) Drop start point of articles X ... X (from the weighing hoppers 24 ... 24 to the collecting chute 25)
P1 that is discharged to the vehicle
The arrangement point P6 of 6 and the lateral seal start point P3 are known in advance from the mechanical dimensions of the weighing machine 1 and the packaging machine 2 or the weighing and packaging system, or the positional relationship at the time of setting. Therefore, each of these points P1, P
The distance between 2 and P3 is also known in advance.

From the fall start point P1 to the fall article detection point P
The distance to 2 (the distance of the first half of the fall) is L1, and the distance from the falling article detection point P2 to the lateral seal start point P3 (the distance of the latter half of the drop) is L2. These distances L1,
L2 may be a vertical straight line distance connecting the points P1, P2, P3, or a diagonal straight line distance along which the article X actually moves, or a distance along a parabola. Further, the time required for the article X to fall from the fall start point P1 to the fall article detection point P2 (first half fall time) is T1, and the time required to fall from the fall article detection point P2 to the horizontal seal start point P3 ( Second half fall time)
Is T2.

It is assumed that during the weighing and packing operation, the first half drop time T1 is Ta and the second half drop time T2 is Tb. For example, it is assumed that the first half drop time T1 is changed to Tc by changing the article. Alternatively, it is assumed that the first half drop time T1 changes to Tc due to a change in the place of origin of the raw material used (potatoes in this example) or a change in weather around the work site without changing the article. This change in T1 can be seen from the article fall start time t1 and the fall article detection time t2. Value T of new second half fall time T2
x is obtained by proportional calculation using only the time parameter as shown in Equation 1.

[0030]

[Equation 1]

Alternatively, it is also possible to obtain a proportional calculation by using a distance parameter as shown in the equation (2).

[0032]

[Equation 2]

In the case of Expression 1, it is not necessary to store the mechanical distance parameter in the memory. First half drop time T
c and the time parameter (Ta,
Tb) and the value T of the second half fall time T2
x is required. In the case of the equation 2, it is not necessary to store the time parameter in the work so far in the memory.
First half drop time Tc and mechanical distance parameter (L
, L2), the value Tx of the second half fall time T2 is obtained. In both cases, the memory usage will be as small as possible.

In any case, the time when the latter half drop time Tx elapses from the falling article detection time t2 is the arrival time t3 of the changed new article X at the lateral seal start point P3.

In this way, since the behavior of the fall of the article X in the latter half of the drop is detected based on the behavior of the fall in the first half of the fall, the latter half of the drop (for example, between the tube 11 and the lateral sealing device 15). Since it is not necessary to provide sensors for detecting articles, the packaging machine 1 can be prevented from becoming complicated and costly.

Similarly, since the start of dropping of articles is detected based on the hopper open signal Sb transmitted when the weighing hoppers 24 ... 24 are opened, the detection of articles in the first half of the drop (for example, the upper part of the collecting chute 25) is also performed. It is not necessary to provide sensors for this, which also suppresses complication and cost increase of the packaging machine 1. After all, the packaging machine 1 is provided with the sensor 16 for detecting the article only at the intermediate point P2 of the drop path.

Then, the actual first half drop time T of the article X
Since the arrival time at the horizontal seal start point P3 is detected based on 1, the subtle fluctuation of the fall time of the article X is automatically detected with high accuracy while reducing the amount of memory used. The arrival time t3 at the lateral seal start point P3 is automatically and accurately detected. As a result, the defective rate of biting of the article X into the lateral seal portion of the packaging material F or the bag B is reduced without depending on the operator skill, and even if not a skilled operator, the weighing and packaging system operates at high speed. In the same manner (even if the cycle time is shortened), the yield and productivity can be improved.

By the way, the first half of the article X falls (slides) in contact with the collecting chute 25 in the first half. During this time, air resistance and frictional resistance due to contact with the collecting chute 25 act on the article X. On the other hand, in the latter half of the fall of the article X, the inside of the tube 11 falls (free falls) without coming into contact with the tube 11. During this time, the article X
Only the air resistance acts on. The influence of such resistance may be taken into consideration when calculating the second half drop time T2.

For example, in the first half of the fall, the types of resistance acting on the article X are larger than those in the latter half of the fall, and therefore the resistance acting on the article X is also larger. As compared with the second half drop time T2, the variation for each article X becomes large. As a result, for example, the proportional relationship of (Ta: Tc = Tb: Tx) in Expression 1 is not always established. That is, the second half drop time T2 does not always change at the same ratio as the change ratio (Tc / Ta) of the first half drop time T1.
May be calculated so as to change at a rate smaller than the rate of change (Tc / Ta) in the first half fall time T1.

In any case, since the falling article detection sensor 16 for dividing the falling path into the first half and the second half is arranged at the boundary point P2 between the weighing machine 1 and the packaging machine 2, in other words, the article X is Since it is arranged at the point P2 where the free fall starts, the first half drop time T1 whose fluctuation is relatively large is actually detected, and the latter half drop time T2 whose fluctuation is relatively small is detected (estimated). Will be done. Therefore, the detection accuracy of the entire fall time (T1 + T2) is improved as compared with the case where, for example, the drop time with the larger variation is calculated / estimated, and consequently the arrival time of the article X at the horizontal seal start point P3. The detection accuracy of t3 is improved.

In addition, by disposing the falling article detection sensor 16 at the boundary point P2 between the weighing machine 1 and the packaging machine 2,
Within the range of the first half of the drop or within the range of the second half of the drop, the type of resistance that acts on the article X does not change, and therefore the resistance that acts on the article X does not change. This also simplifies and stabilizes the calculation of the second half drop time T2 and the arrival time t3 based on the first half drop time T1, and improves the detection accuracy of these.

The detection of the first-half drop time T1 is performed, for example, at regular time intervals (for example, every one hour) or at a constant number of processing times (for example, 1000) regardless of whether or not the article is changed.
It is performed for each time of wrapping and it is confirmed whether or not the drop time T1 has changed. If it is changed, the value T
Based on 1, the latter half drop time T2 is updated to a new value, and the value T2 is used for calculating the arrival time t3 of the article at the lateral seal start point P3 thereafter. In addition, the first half drop time T1 may be detected again at the time of changing the article, at the time of starting the packaging machine 1 or the system, or at any time when the operator makes a request.

When detecting the first half drop time T1, not a single sample but a plurality of samples (for example, 5 samples) are sampled and averaged (for example, arithmetic average).
As a result, even if, for example, the articles X are stagnated on the collecting chute 25 and the first-half drop time T1 is temporarily lengthened, such a specific phenomenon / influence is reduced and is originally obtained. Data close to the power half drop time T1 to be obtained can be obtained, and the detection accuracy of the second half drop time T2 and the arrival time t3 is maintained.

(Corresponding to the arrival time of the article) As shown in FIG. 2, the tubular wrapping material F formed by the horizontal sealing jaws 15j and 15j.
The horizontal seal is a lumped article X1 that falls inside the packaging material F.
And the subsequent block X2. That is, the proper lateral seal range without biting of the article X is
The range is from the time immediately after the next article X2 passes the point P3 (A) to the time latest, immediately after the previous article X1 passes the point P3 (A). If the start of the lateral seal is delayed beyond this range, the tip of the next article X2 is bitten (C). On the contrary, if the start of the lateral seal is early beyond this range, the end portion of the previous article X1 is caught (D).

FIG. 3 is a time chart showing the operation in the case of (a). That is, in order to avoid the tip portion of the article X from being caught, the seal jaws 15j, 15j contact the time ty immediately before the time t3 when the tip portion of the article X reaches the point P3. In this case, in order to avoid the tip of the article X from being caught, it is necessary to detect the arrival time t3 of the tip of the article X among the arrival times of the article X. Therefore, during the first half drop time T1, the hopper open signal Sb is transmitted.
The time is from the reception time t1 to the time t2 when the article detection sensor 16 is first turned on. Then, the time when the second half drop time T2 elapses from the time t2 is defined as time t3 when the tip of the article X reaches the point P3.

However, if it is desired to prevent the tip portion of the article X from being caught, it is not necessary to perform the lateral sealing immediately before reaching the tip portion of the article X, and it may be performed earlier. However, in that case, there is a concern that the end portion of the previous article X1 may be caught, and in order to prevent this, it is necessary to detect that the end portion of the previous article X1 has passed the point P3. Therefore, it is necessary to detect both the arrival time t3 of the end of the previous article X1 and the arrival time t3 of the subsequent tip of the next article X2. On the other hand, if the horizontal seal is set just before the arrival of the tip of the article X in this way, it is possible to reliably detect both the articles X1 by only detecting the arrival time t3 of the tip of the next article X2. , X2 can be prevented from being caught.

The packaging machine control unit 10
Sends an article discharge (fall) request signal Sa at time tx. The weighing machine control unit 20 receives the signal Sa
In response to this, the weighing hoppers 24 ... 24 are opened. The intervals of these article discharge request signals Sa ... Sa (time tx ... tx), the intervals of hopper open signals Sb ... Sb (time t1 ... t1), the intervals of fallen article detection signals Sc ... Sc (time t2 ... t2), articles The interval of arrival of X (time t3 ... t3) and the interval of lateral sealing operation (time ty ... ty) are each one cycle time C.

In such a state, as shown by the broken line in FIG. 3, the fall time is shortened (first half drop time T1 is Ta to Tc, second half drop time T2 is Tb to Tx),
As a result, assuming that the arrival time t3 is advanced by the time ΔT, the sealing jaws 15j and 15j will bite the tip of the article X as it is.

Therefore, for example, as indicated by the symbol (f), the horizontal seal start time ty is advanced by a time substantially the same as the time ΔT. For that purpose, for example, the jaw turning motor and the turning center horizontal movement motor of the lateral sealing device 15 are controlled. In this case, the horizontal sealing operation is shifted to the whole, but the cycle time C based on the article discharge request signal Sa is used.
Does not shift.

Alternatively, as indicated by the symbol K, the transmission time tx of the article discharge request signal Sa is delayed by about the same time as the time ΔT. As a result, the start of the fall of the article X is delayed by the same time ΔT as indicated by the symbol K, and the arrival time t of the article X is t.
3 is kept. In this case, the cycle time C based on the article discharge request signal Sa shifts entirely, but the lateral seal operation does not shift.

On the contrary, as shown by the broken line in FIG. 4, if the drop time becomes long and as a result the arrival time t3 is delayed by the time ΔT, the sealing jaws 15j,
Although there is no concern that 15j will bite into the tip of the article X, there is a possibility that it will bite into the end of the previous article X1, as described above.

Therefore, the start time ty of the lateral seal is delayed by about the same time as the above-mentioned time ΔT as indicated by the symbol s, or the article discharge request signal Sa is indicated by the symbol s.
The transmission time tx of the article X is advanced by almost the same time as the time ΔT, and the falling start of the article X is timed by the same time ΔT as indicated by the symbol S.
Therefore, the arrival time t3 of the article X is maintained.

On the other hand, FIG. 5 is a time chart showing the operation in the case of (a). That is, in order to prevent the end portion of the article X from being caught, the seal jaw 15
j and 15j are in contact with the time ty immediately after the time t3 when the terminal end of the article X reaches the point P3. In this case, the article X
In order to prevent the end portion of the article X from being caught, it is necessary to detect the arrival time t3 of the end portion of the article X among the arrival times of the article X. Therefore, the first half drop time T1 is from the time t1 when the hopper open signal Sb is transmitted / received, to the article detection sensor 1
It is the time until the time t2 when 6 is first turned off after being turned on. Then, the time when the latter half drop time T2 elapses from the time t2 is set as the time t3 when the end portion of the article X reaches the point P3.

Also in this case, if it is desired to prevent the end portion of the article X from being caught, the lateral seal need not be performed immediately after reaching the end portion of the article X, but may be performed later. Since there is a concern that the tip of the next article X2 will be caught, the horizontal seal is thus set just after the end of the article X is reached, and the end of the previous article X1 is reached. Only by detecting the time t3, it is possible to surely prevent the articles X1 and X2 from being caught.

In such a state, as shown by the broken line in FIG. 5, the fall time becomes short, and as a result, the arrival time t
If 3 is advanced by the time ΔT, the seal jaws 15j and 15j are not likely to bite the end portion of the article X as they are, but as described above, the tip portion of the next article X2 may be bitten. is there.

Therefore, the start time ty of the horizontal seal is advanced by the same time as the time ΔT as indicated by the symbol "T", or the article discharge request signal Sa is indicated by the symbol "H".
The transmission time tx is delayed by about the same time as the time ΔT, and the falling start of the article X is timed by the same time ΔT as indicated by the symbol t.
Therefore, the arrival time t3 of the article X is maintained.

On the contrary, as shown by the broken line in FIG. 6, if the fall time becomes long and, as a result, the arrival time t3 is delayed by the time ΔT, the seal jaws 15j,
15j bites the end portion of the article X.

Therefore, the start time ty of the lateral seal is delayed by about the same time as the time ΔT as indicated by the reference numeral N, or the article discharge request signal Sa is indicated by the reference numeral D.
The sending time tx of the article X is advanced by almost the same time as the time ΔT, and the fall start of the article X is timed by the same time ΔT as indicated by the symbol N.
Therefore, the arrival time t3 of the article X is maintained.

In the above example, the packaging machine 1 is of the continuous transfer type, but it goes without saying that it may be of the intermittent transfer type.

[0060]

As described above, according to the present invention, a subtle change in the falling time of an article is automatically detected without storing a large amount of unnecessary data in a memory, and thus the article is laterally sealed. Since the arrival time at the starting point can be detected with high accuracy, the defective rate of biting articles into the lateral seal portion can be reduced without depending on the operator skill. Even when high-speed production is performed, yield and productivity can be improved. INDUSTRIAL APPLICABILITY The present invention can be expected to be widely applied to general vertical bag-making packaging machines.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a weighing and packaging system including a vertical bag-making packaging machine according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing the relationship between the interval between front and rear articles and the timing of the horizontal sealing operation.

FIG. 3 is a time chart showing an operation for avoiding the biting of the tip of an article.

FIG. 4 is the same time chart.

FIG. 5 is a time chart showing an operation for avoiding the biting of the end portion of the article.

FIG. 6 is the same time chart.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Vertical bag making and packaging machine 2 Weighing machine (upstream device) 10 Packaging machine control unit (fall start detection means, arrival time detection means) 15 Horizontal sealing device (horizontal sealing means) 15j Seal jaw 16 Falling article detection sensor (falling article Detection means) 24 weighing hopper B bag F tubular packaging material X article

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Claims (6)

[Claims] 1. A vertical bag-manufacturing and packaging machine for laterally sealing a tubular packaging material to form a bag while receiving and filling articles falling into the bag, and a horizontal sealing means for performing the horizontal sealing. Fall start detection means for detecting the fall start of an article, fall article detection means for detecting an article in the middle of fall, and the article is the horizontal seal means according to the time from the fall start of the article to the detection of the article in the middle of fall. A vertical bag-making packaging machine, comprising: arrival time detection means for detecting the time when the horizontal seal start point is reached. 2. The vertical bag-making packaging machine according to claim 1, wherein the falling article detection means is arranged in the vicinity of a point where the article starts free fall. 3. The vertical manufacturing method according to claim 1, wherein the drop start detecting means detects a drop start of the article by receiving an article ejection signal of an upstream device for ejecting the article. Bag packing machine. 4. A transmission means for transmitting an article discharge request signal to an upstream device for discharging an article, and a transmission time changing means for changing a transmission time of the signal based on a detection result of the arrival time detection means. The vertical bag-making packaging machine according to any one of claims 1 to 3. 5. The horizontal seal start time changing means for changing the horizontal seal start time of the horizontal seal means on the basis of the detection result of the arrival time detecting means is provided. Vertical bag making and packaging machine described. 6. The arrival time detecting means detects the arrival time based on a track record of the time from the start of the article falling a plurality of times in the past to the detection of the article in the middle of falling. The vertical bag-making packaging machine according to any one of 1.