JPH07106734B2 - Packaging method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention uses a vertical, inclined, horizontal or other packaging machine used for packaging bread, ramen, etc. with a film made of synthetic resin or the like. Regarding the packaging method to be performed.

《Prior art》 Various packaging machines have already been used, and in particular, horizontal packaging machines are widely used in various industries to ensure hygienic distribution of products and to increase the commercial value of the products. It is designed to be used.

However, conventionally, this type of packaging machine has a configuration as illustrated in FIG.

That is, the feed conveyor S driven by the prime mover a and having the blades b, b ... Feeding roller e for feeding the film and the film d
A known bag-making device f for forming a cylindrical shape, a center seal g for forming a cylindrical film d'by closing both side edges of the film d by welding, and the cylindrical film d'for an arrow h. Direction and the transfer mounting path i running in the direction, and the top seal portion TS at the final stage has a pair of heated fusing blades j and k.
It is equipped with a rotary fusing blade 1 having

Therefore, in the case of the conventional packaging machine described above, the prime mover a gives the feed conveyor S a desired constant speed rotation, and the articles B, B ... such as ramen and juice bags are provided between the blades b, b. The articles B, B ... Are sequentially sent to the next film feeding section CS.

By this feeding, in the film feeding portion CS, it is fed from the original fabric C at a predetermined interval into the tubular film d'formed by the feeding roller e and the guide roller g1 in the center seal g and the welding roller g2. By the synchronous rotation of the rotary fusing blade 1 in the top seal portion TS, the position of the cutting mark (not shown) in which the tubular film d'is pre-displayed on the film d in the interval between the transfer articles B, B ... Then, they are fused one after another, and the articles B, B ...
A single package m is obtained by separating the front and back of the ... In a welded state.

Here, in the packaging machine, in order to synchronously operate the supply conveyor S, the film feeding section CS, and the top seal section TS, the supply conveyor S driven by the prime mover a.
Power is mechanically taken out of the article B, and the film feeding section CS and the top seal section TS are respectively operated by the chain driving means as indicated by the broken lines M1 and M2 in the figure, and practically 100 pieces of the articles B are collected in one minute. I try to pack it.

By the way, the most problematic part of the packaging machine is the top seal part TS, and the articles B, B ...
If the spaced apart position is incorrectly arranged for some reason, the rotary fusing blade 1 in the top seal portion TS will be bitten by the article B instead of fusing the tubular film d ′. If such an accident occurs, the operation of the packaging machine will be stopped immediately.
By cutting off the power supply to the film, not only the top seal part TS but also the supply conveyor S as well as the film feeding part CS
The entire movement, including that, will stop.

As a result, the worker who has supplied the articles B, B ... To the supply conveyor S has to interrupt the supply work, which not only lowers the work efficiency, but also causes a sudden stoppage of operation. The larger the size, the greater the fatigue, and the considerable amount of labor and time required for restarting after removing the above-mentioned bitten article.

Therefore, in such a case, a product in which a biting accident of an article is detected in advance and the operation of the packaging machine is automatically stopped before the biting (Japanese Patent Laid-Open No. 58-160209) has already been put into practical use. However, this does not cause much bite, and because it automatically stops using a clutch brake or the like, its wear loss is remarkable.

Further, with respect to the prime mover as a drive system for driving the supply conveyor, the number of rotations thereof is input to the arithmetic control circuit,
A motor which is a drive system of the film feeding section and a motor which is a drive system of the top seal section are respectively controlled by a start signal based on the calculation so as to solve the drawbacks of the conventional example (Japanese Patent Application Laid-Open No. 2000-242242). (Sho 61-259927) is also proposed.

However, in this case as well, since the rotational speed of the prime mover is input to the arithmetic control circuit, preprocessing for data input is naturally required, and since the rotational speed is a function of displacement and time, it is instantaneous. Since it cannot be computerized, it takes some time to computerize the rotation speed. As a result, as a practical problem, it cannot be managed by one computer, and each drive system has its own dedicated system. It will require an electrical controller.

<< Problems to be Solved by the Invention >> In view of the above-mentioned conventional defects, the present invention drives a supply conveyor, a film feeding section, and a top seal section by respective respective prime movers that are in a power logic coupling relationship with each other. In addition to using a packaging machine that allows the other parts to continue operating even when the operation is stopped, the rotation angle signal is taken out from the supply conveyor and the incorrect position of the article in the film feeding section is detected. Appropriately using the bite danger signal obtained by shifting, control the control motor such as the servomotor or the motor with an inverter, which is the prime mover of the top seal part, without using a clutch brake or the like. Only by control, when the article that has generated the above-mentioned biting danger signal arrives, only the operation of the rotary fusing blade of the top seal part is temporarily stopped and At the next normal fusing point where the article at the incorrect position has passed, the fusing blade is allowed to start operating normally, and by taking out the rotation angle signal, the respective drive systems can be controlled. By providing an encoder only on the supply conveyor without providing an encoder, the processing time in each drive system can be extremely shortened, and by doing so, it is possible to fully cover the whole by using only one computer. In addition, the rotary fusing blade is adapted to match the moving speed of the film feeding portion within a predetermined rotation angle range before and after the sealing point of the tubular film, thereby ensuring a desirable welded state of the tubular film. Its purpose is to guarantee the fusing by.

<< Means for Solving the Problems >> In order to achieve the above-mentioned object of the present invention, by the supply conveyor driven by the prime mover, the articles provided thereto are transferred at a predetermined speed, thereby The articles are sequentially in the film feeding portion, the fed film in the tubular film formed by sealing by the center seal, is fed at a predetermined interval, then by the rotary fusing blade in the top seal portion, In the method of fusing the tubular film between the transfer articles with a cutting mark of the film, and sequentially separating the front and rear of the article in a welded state, the film delivery and the center seal in the film delivery unit. The first control motor, which is separate from the prime mover of the supply conveyor, and the rotary fusing blade of the top seal part are driven by the second control motor, respectively. , A rotation angle signal obtained from an encoder connected to one rotation shaft that rotates together with the rotation of the supply conveyor, and from a detection sensor that determines the presence or absence of an article in a dangerous zone before and after the film cutting mark in the film feeding portion. The bite danger signal is input to the electric controller, and one output of the signal is applied to the first control motor so that it is operated synchronously with the supply conveyor and the power logic connection. 2 When the control motor is temporarily stopped at a predetermined position and then applied so as to start by receiving a start signal generated by the rotation angle signal of the encoder, upon arrival of the dangerous section that issued the bite danger signal The operation of the rotary fusing blade is stopped by stopping the input of the activation signal due to the biting danger signal, and it is normal from the arrival of the cutting mark from the next time. When the cutting operation is started, the rotation of the rotary fusing blade from the rest position is within a predetermined rotation angle range before and after the sealing point of the tubular film, and the rotation speed is the film feeding of the tubular film. An object of the present invention is to provide a packaging method characterized by controlling so as to match the transfer speed in a unit.

<< Operation >> According to the method of the present invention, when the supply of the article to the supply conveyor is out of the normal position and is directly supplied to the next center seal part, the detection sensor detects this and the bite danger signal. The rotation angle signal is derived from the supply conveyor that is operating at a constant speed, and the second control motor that drives the rotary fusing blade of the top seal part is controlled by the above two signals. When the article in the incorrect position detected by the detection sensor has advanced to the series of rotary fusing blades, the work of the rotary fusing blade does not use mechanical elements such as a clutch brake,
It is paused by using the instantaneous stop and instantaneous start by the control motor. Therefore, an accident such as biting the article does not occur, and the supply conveyor and the center seal part are not driven and driven by their respective prime movers even when the fusing blade is at rest. When the supply of the article can be continued, the article continues to advance due to the operation of the center seal portion, and the article at the incorrect position advances as it is, and when the next cutting mark arrives, the rotary fusing blade moves to the second position.
The normal operation is started by the instantaneous start of the control motor, and the packages of the articles are sequentially obtained. Therefore, the articles in the incorrect positions are simply carried out of the packaging machine in the unwrapped state, The packaging can be continued without stopping the operation of the packaging machine.

Moreover, since the rotation angle signal from the supply conveyor is used instead of converting the rotation speed of the drive system into information as described above, some type of trigger (one cycle, one pulse) is generated in each drive system. By doing so, it is possible to perform short-time processing such as counting the number of intervals that is the interval, comparing this with a logical value, and adjusting
One computer can do all the processing.

Further, the rotary fusing blade is not only in a resting state at a predetermined position, but is also desirably controlled because the rotation speed thereof is controlled within a predetermined rotation angle range before and after the sealing point so as to match the film transfer speed. It is possible to obtain fusing while ensuring the welded state of the tubular film.

<< Example >> A case where the present invention is carried out by using the illustrated packaging machine 1 will be described.

The packaging machine 1 shown in FIG. 1 is also provided with a supply conveyor 2, a film feeding section 3 provided on the supply conveyor 2, and a top seal section 4 on the end side, as in the conventional case.

In the supply conveyor 2, 2a, 2a ... are blades,
The articles B, B ... Are provided between the blades 2a, 2a ... And the drive pulley 2b is driven by the prime mover 2c.

Further, the film feeding section 3 in the next stage is, as is known, a feeding roller 3c for feeding the film 3a from an original fabric 3b wound with a film 3a made of synthetic resin, and the film 3c.
Known bag making machine for forming 3a into a tubular film 3d
3e, a center seal 3f for heat-sealing the side edges of the tubular film 3d in the width direction, and the articles B, B ... Derived from the supply conveyor 2 are delivered, and the article B together with the tubular film 3d. , B ... and a transfer table 3g formed for transferring, in which case the first control motor 3h such as a servo motor, a motor with an inverter, a CD control motor, a stepping motor, a pulse motor is fed out. Roller 3c
And drive the center seal 3f.

Further, like the conventional packaging machine, the top seal part 4 is equipped with a rotary fusing blade 4a, which is a driving blade 4b.
And the interlocking blade 4c are rotated in the directions of the arrows 4d and 4e, and the fusing edges of the tubular film 3d are melted and sealed by the respective blade edges.

Although the above-mentioned configuration is almost the same as the conventional packaging machine, the packaging machine suitable for carrying out the present invention is different from the conventional example in the following points.

That is, in the supply conveyor 2 as illustrated in FIG. 1, first, in order to extract the rotation from the supply conveyor 2, the rotation is taken out from the driven pulley 2d by the single rotation shaft 5a. The rotation angle signal RAS of the driven pulley 2d that rotates at a constant speed by the connected encoder 5b.
Are introduced into an electric controller 6 having a shift register and a computer function.

Here, the film 3a wound around the raw fabric 3b has the top seal portion 4 as shown in FIG.
It is the same as the conventional one that the cutting marks 7, 7 ... Are displayed at the places to be fused by.

Next, in the film feeding section 3, a detection sensor 8 formed by a photoelectric tube or the like at a desired point is directed toward the film 3a.

The role of the detection sensor 8 is in the danger zone D in FIG. 2 which is set before and after the cutting marks 7, 7 provided in advance on the film 3a, and the articles B, B. This is for detecting whether or not to do.

That is, in the supply conveyor 2 as shown in FIG. 1, when the article B is not placed between the blades 2a, 2a and is placed on the blade 2a when the article is provided (actually At the time of packaging, the seasoning liquid bag is blade 2a
When it is placed in close proximity to),
The article B is transferred to the film feeding section 3, is in the top seal section 4, and is rotated by the rotary fusing blade 4a.
When 3d is melted, the article B itself or the seasoning liquid bag will be bitten, but such a thing must be avoided, and as the avoidance means,
The detection sensor 8 is utilized as described later.

Further, one output of the electric controller 6 is connected to the first control motor 3h of the film feeding unit 3, whereby the supply conveyor 2 and the film feeding unit 3 are logically coupled for power, and the synchronous operation is performed. Is possible.

Further, the other output of the electric controller 6 is connected to the top seal portion 4 as follows.

That is, a second control motor 4f for driving the rotary fusing blade 4a of the top seal portion 4 to rotate, which is also a servo motor or the like, is connected to be driven by the output from the electric controller 6. .

By the above connection, the rotary fusing blade 4a can be subjected to the rotation control as shown in FIG.

That is, the drive blade 4b of the rotary fusing blade 4a rotates in the direction of the arrow 4d, but at the solid line position P, the rotation is temporarily stopped,
From here, it starts by receiving the activation signal emitted from the rotation angle signal RAS of the encoder 5b, and when the activation signal is not input to the second control motor 4f, the rest state is held. In other words, the operation of the rotary fusing blade 4a is stopped.

Further, the rotation from the solid line position P is within the range of the predetermined rotation angle α before and after the sealing point MP, and the rotation speed is
It is controlled so as to match the transfer speed of the tubular film 3d in the film feeding portion 3.

Therefore, in order to carry out the packaging method according to the present invention using the packaging machine 1 described above, the packaging machine 1 is operated, and the blade is moved by the supply conveyor 2 driven by the prime mover 2c.
2a, 2a ... Transfer the goods B, B ... provided between them at a predetermined speed.

In the film feeding unit 3, the feeding roller 3c driven by the first control motor 3h causes the film 3a fed from the material 3b to be formed into a tubular shape by the bag making machine 3e, which is a center seal 3f. Then, the tubular film 3d is obtained by welding by the known method, and the tubular film 3d is conveyed rightward on the transfer table 3g by the operation of the center seal 3f.

The articles B, B, ...
By a, 2a ..., It will be sequentially fed into the tubular film 3d at a predetermined interval, and then the feed conveyor 2 and the one rotating shaft 5a, the encoder 5b, and the electric controller 6 as described above. The tubular film 3d is rotated by the rotary fusing blade 4 which is synchronously driven by the connected second control motor 4f.
.. are melted and cut at the cutting marks 7, 7 ... And the package m of the articles B, B ..

Here, in the present invention, as described above, the detection sensor 8 such as a photoelectric tube detects whether or not the article B is present in the dangerous zone D, and electrically confirms the presence of the bite danger signal generated by confirming the presence. Since the second control motor 4f is applied via the controller 6, when the article B in the dangerous zone D is detected, when the article B arrives, the second control motor 4f causes the second control motor 4f to move. The rotary fusing blade 4a is stopped at the solid line position P in FIG.
After passing through the rotary fusing blade 4a, if the next article is in the normal position, the rotation of the rotary fusing blade 4a is started so that the fusing at the cutting mark 7 is performed. Within the range of the predetermined rotation angle α before and after the sealing point MP, the rotation speed of the rotary fusing blade 4a is controlled so as to match the transfer speed of the tubular film 3d in the film feeding portion 3, so that the tubular film The film 3a of 3d can be fused and secured without any trouble.

<< Effects of the Invention >> Since the present invention is carried out as described above,
First, the rotary fusing blade is in a dormant state in synchronism with the arrival of an article placed at an incorrect position. At this time, neither the supply conveyor nor the film feeding section continues its operation and does not stop. Not only is the bite not caught by the blade, but the article in the wrong position is not packaged, there is no stopping of the packaging work, resulting in improved work efficiency and elimination of labor and time wasted due to restarting. Then
Since the operator is not unnecessarily tired and the operation of the packaging machine is not stopped suddenly, a desirable result can be obtained in terms of improving the durability.

And, more importantly, the drive system is not the rotation speed control, but the rotation angle signal control is obtained by the encoder connected to the one rotation axis, so that the processing time for one drive system is extremely short and It is possible to perform all the processes by using one computer as a dynamic controller.

In addition, if the rotation angle signal control is performed as described above, high-precision time management can be performed using the constant time interrupt priority processing function that is actually possessed by the microcomputer system. It is not necessary to use an encoder as a system and use this as a pair with a servo motor or a stepping motor. If the encoder is used only in the drive conveyor drive system, the servo motor can be used as the first and second control motors. Does not have to be used in a limited manner, and any type of control motor can be used.

Furthermore, the rotating fusing blade not only becomes a rest state at a predetermined position, but also within a predetermined rotation angle range before and after the sealing point,
Since the rotation speed thereof is controlled so as to match the film transfer speed, it is possible to always guarantee the fusing of the tubular film while ensuring a desired welding state.

[Brief description of drawings]

FIG. 1 is a side explanatory view showing an example of a packaging machine that can be used for carrying out the packaging method according to the present invention, FIG. 2 is a partial plan view of a tubular film, and FIG. 3 is the same as the rotary fusing blade operation of the packaging machine. The front explanatory drawing which shows a state, FIG. 4 is a side explanatory drawing which shows the conventional packaging machine. 2 …… Supply conveyor 2c …… Motor 3 …… Film feeding part 3a …… Film 3d …… Cylindrical film 3f …… Center seal 3h …… First control motor 4 …… Top seal part 4a …… Rotating fusing blade 4f …… 2nd control motor 5a …… one rotation axis 5b …… encoder 6 …… electric controller 7 …… cutting mark 8 …… detection sensor B …… article D …… dangerous zone RAS …… rotation angle signal

 ─────────────────────────────────────────────────── --- Continuation of the front page (56) Reference JP-A-58-160209 (JP, A) JP-A-61-259927 (JP, A) JP-A-62-109712 (JP, A) JP-A-62- 16309 (JP, A) Actually opened 55-36112 (JP, U)

Claims (1)

[Claims] 1. A supply conveyor driven by a prime mover transfers articles provided to the conveyor at a predetermined speed so that the articles are sequentially provided in a film feeding section,
In the tubular film formed by sealing the film fed out by the center seal, sent at a predetermined interval, then by the rotary fusing blade in the top seal portion,
In the method of fusing the tubular film between the transfer articles with a cutting mark of the film, and sequentially separating the front and rear of the article in a welded state, the film delivery and the center seal in the film delivery unit. To
A first control motor, which is separate from the prime mover of the supply conveyor, and a rotary fusing blade of the top seal portion are driven by a second control motor, respectively, from an encoder connected to one rotation shaft that rotates together with the rotation of the supply conveyor. The obtained rotation angle signal and the biting danger signal from the detection sensor that determines the presence or absence of the article in the dangerous section before and after the film cutting mark in the film feeding portion are input to the electric controller, and one output thereof is output. By applying to the first control motor,
By making this a synchronous operation by power-logic coupling with the supply conveyor, the other output is temporarily stopped at the second control motor at a predetermined position, and thereafter a start signal generated by the rotation angle signal of the encoder is received. When the dangerous zone where the biting danger signal is issued is applied so as to start, the operation of the rotary fusing blade is stopped by stopping the input of the activation signal due to the biting danger signal, and cutting from the next time. From the arrival of the mark, the normal fusing operation is started, and the rotation of the rotary fusing blade from the rest position is
A packaging method, characterized in that it is within a range of a predetermined rotation angle before and after the sealing point of the tubular film, and its rotation speed is controlled so as to match the transfer speed of the tubular film at the film feeding portion.