JP2881591B2 - Degassing packaging equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method in which a band-shaped film is put on a package to be conveyed in a tandem state, and air in the tube is removed by a pipe nozzle inserted into the tube. The present invention also relates to a deaerated packaging apparatus in which a tubular film is cross-sealed between each packaged object.

[0002]

2. Description of the Related Art In a conventional apparatus for packing an object to be packaged in a tube film while sucking air in the tube film by a pipe nozzle, if the air in the tube film is excessively sucked, the differential pressure between the inside and outside of the film is increased. Therefore, the friction between the film and the pipe nozzle increases, and the film does not move forward, so the vacuum must be reduced. Therefore, the applicant of the present application previously provided a normally closed electromagnetic on-off valve in a connecting pipe connecting the pipe nozzle and the vacuum source, and provided an elongated bypass tube to bypass the electromagnetic on-off valve. With a long and narrow bypass tube, the inside of the tube film being transported is always maintained at a weak negative pressure, and just before the rotary sealer cross-seals the tube film, the solenoid valve is opened for about 0.2 seconds to suck air. A patent application was filed. According to the invention, the large-volume suction is instantaneous, so that the internal vacuum can be increased without stopping the film.

[0003]

However, if the invention disclosed in Japanese Patent Application Laid-Open No. 1-267136 is incorporated into such an invention, there is a problem that the vacuum in the film becomes weak again. In other words, the latter invention supplies the articles to be packaged in a tandem state inside the tube film being transported, and ensures that if the supplied articles to be packaged are not formed, a toothless empty bag is not formed in the continuous tube film. Further, the invention is such that the tuft film is stopped until the delay of the packaged object can be recovered. However, the air leaks from the outside while the film is stopped, so that the vacuum of the first bag at the time of re-driving becomes weak.

[0004]

SUMMARY OF THE INVENTION In order to prevent the formation of a vacuum sweet bag, the present invention arranges an elongated pipe nozzle for vacuum suction along a track for transporting a large number of items to be packed in tandem. A packaging device in which a band-shaped film moving in the same manner as each packaged object is rolled into a cylindrical shape around the packaged object and the pipe nozzle by a cylinder-making means, and the tube film is cross-sealed with a rotary sealer. Detecting the feed interval of each package by a switch provided on the package transport path, processing the equal pitch data corresponding to the feed interval by a controller, and when the equal pitch data is spread, In the control device configured to stop the movement of the film and the rotary sealer until the data interval becomes equal, the pipe nozzle is provided in the middle of a connecting pipe connecting a vacuum source. And over multi-closed first shut-off valve,
A tube that bypasses the first on-off valve, particularly a bypass tube having a smaller diameter than the pipe nozzle, and a normally open type provided downstream of the first on-off valve in a vacuum suction direction at the pipe nozzle. A second on-off valve, control means for opening the first on-off valve for a moment immediately before the rotary sealer cross-films the film in a fixed cycle, and the second on-off valve while the movement of the film and the rotary sealer is stopped. The control means for closing the on-off valve, the time when the stopped film and the rotary sealer start operating again and the time when the rotary sealer clamps the film, and the timing when the pipe nozzle first starts vacuum suction are compared with each other. Means for controlling the direction of spreading.

According to a second aspect of the present invention, a long and narrow vacuum suction pipe nozzle is arranged along a track for transporting a large number of articles to be packaged in tandem, and the pipe nozzle is moved in the same manner as each of the articles to be packaged. A packaging device that rolls the band-shaped film into a cylindrical shape around the object to be packaged and the pipe nozzle by means of a cylinder, and cross-seals the tube film with a rotary sealer; The switch detects the feed interval of each packaged object, processes the equal pitch data corresponding to the feed interval by the controller, and when the equal pitch data is spread, until the data interval becomes equal, In the control device configured to stop the movement of the film and the rotary sealer, a normally closed first opening provided in the middle of a connecting pipe connecting the pipe nozzle to a vacuum source. A valve, a tube bypassing the first on-off valve, particularly a bypass tube having a smaller diameter than the pipe nozzle, and a normal provided on the downstream side of the first on-off valve in a vacuum suction direction at the pipe nozzle. An open-type second on-off valve, control means for momentarily opening the first on-off valve immediately before the rotary sealer cross-seals the film in a constant cycle, and a control means for stopping the movement of the film and the rotary sealer. And control means for closing the second on-off valve, and control means for, when the stopped film and the rotary sealer start operating again, accelerating and then starting up at a gentle speed.

[0006]

The packaged articles arranged at equal intervals in the tube film are conveyed together with the film, and immediately before the tube films are successively cross-sealed with the rotary sealer between the respective packaged articles, the tube film is placed in the tube film. 0, 2 so that the movement of the film does not stop with the pipe nozzle inserted in
The air is removed for about 0.3 seconds or so. On the other hand, if the intervals between the articles to be fed into the tube film at equal intervals become larger than the allowable value, the intervals between the articles return to the normal values. In the apparatus in which the movement of the film and the rotary sealer is stopped until now, the time difference between the timing at which the film and the rotary sealer starts to rotate and the timing at which the pipe nozzle first starts vacuum suction is set relative to the first aspect. In this case, the film and the rotary sealer are slowly started to move. That is, in the first aspect, the vacuum suction is started early and the air is removed before the rotating sealer cross-seals the film. On the other hand, in the second aspect, the operation at the beginning of the movement of the film and the rotating sealer is slowly started to cross the film. Remove air until sealed.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 2, which is a preferred embodiment, a large number of attachments 42 are supported at equal intervals on an endless chain 41 which rotates at a constant speed while receiving the power of a motor 40. A groove 44 is formed at the center of the upper surface of the frame 43 installed in the feeding conveyor 45 to constitute a supply conveyor 45. The supply conveyor can slide the packaged object 46 pushed by each attachment 42 inside the groove 44 and transfer it to the conveyor 47 behind it as shown by the arrow. A pair of side chains 48 are provided on both sides of the conveyor so as to be supported by two chain wheels 49, 50 and one tension wheel 51, respectively. As shown in FIG. 1, these chains 48 are installed so as to be inclined downward in the direction of transport of the articles 46, and both chains are provided with a large number of clampers 52 at equal intervals. These clampers 52 have a holding force by the elasticity of a normal spring, similar to the structure of a known document scissors, and have two chain wheels 4.
It is released only while in contact with a circular cam (not shown) provided on the shafts 9 and 50 to remove the holding force. In FIG. 1, two rod-shaped rollers 54 rotatably provided on a machine base 53,
A roll-shaped film 56 is set on the
When the film is guided between the chains 48 via the rolls 59 for changing the direction by the roll 58 receiving the rotational power of the belt 7, the belt-like film 60 is moved to both the clampers 52 on both sides by the rotational power of the chains 48. It is supported and transported diagonally downward. Since the distance between the chains 48 on both sides is increased at the portion of the tension roll 51 in the middle of the chain, the film 60 is kept taut in both sides and eventually covers the object 46 on the conveyor. Both sides of the film 60 released from the clamper at the rear chain wheel 50 are a pair of string belts 61 arranged in a V-shape.
, And are welded together in a palm-shape manner by the pinching force of the pair of heating rolls 62. As a result, a large number of items to be packed are packed in the tubular film 63 in a state of being arranged at equal intervals, and the pair of seal bars 65 and 66 rotating on the elliptical orbit 64 as shown by arrows are conveyed by the side belts 67 on both sides. The tube film 63 is welded between the packages to be transported with the help of. Most of the structure of the above-mentioned packaging machine is not particularly new.
No. 307 is also shown.

As shown in FIGS. 1 and 2, the tube film 63 has an end opening near the seal bar 65.
A connecting pipe 11 is connected to the pipe nozzle at an opening on the lower surface at the front of a pair of string-shaped belts 61 arranged in a V-shape. As shown in FIG. 4, the pipe nozzle 10 is formed so as to be flat in the horizontal direction, and the packaged object 46 slides and conveys the upper surface of the pipe nozzle 10 so that no extra space is formed in the film 63. I have. As shown in FIG. 3, a vacuum source 14 consisting of a vacuum pump 12 and an auxiliary tank 13 having a predetermined volume is connected to the end of the connecting pipe 11, and a normally closed electromagnetic on-off valve 15 is provided on the connecting pipe 11. A bypass tube 16 is connected in parallel with the on-off valve, and a flow control valve 17 is provided in the bypass tube. As shown in FIG. 5, the cross-sectional area of the passage of the connecting pipe 11 is
The passage cross-sectional area of the bypass tube 16 is considerably smaller than that of the pipe nozzle 10.

When the operation of the packaging apparatus is stopped, the valve 19 is closed by a signal from the controller 20, and the degree of vacuum in the auxiliary tank 13 is increased by continuing the suction operation of the vacuum pump 12. When the valve 19 is opened by the start of the operation, a flow of air is generated in the connecting pipe 11 toward the auxiliary tank 13 due to the differential pressure. Normally, the air flows through the bypass tube 16 with a volume limited by the flow control valve 17, and the pipe nozzle 10 sucks the air in the film. As the film moves, new air is replenished one after another in the tube film, but the pipe nozzle 10 sucks in the replenished air and keeps the inside of the film under negative pressure so that the friction with the film does not become unnecessarily large. . On the other hand, a pair of seal bars 6
5 and 66 squeeze the tube film in a fixed cycle to cross-seal the film.
Immediately before the contacts 5 and 66 contact each other, the electromagnetic on-off valve 15 is opened for about 0.2 seconds by the signal 18 from the controller 20. During which the result pipe nozzle 10 acts shocking suction force, since the exclusion of air in the film between the sealing bars 65, 66 of the pair instantly, immediately thereafter sealing bar clamping portions thereof Seal.

In FIG. 1, a motor 40 for moving a supply conveyor 45, a motor 57 for moving a film, and a motor 21 for moving rotary sealers 65 and 66 are provided with an encoder 22 for changing the rotation speed of each motor into a pulse signal. 2
3, 24 are provided respectively. In response to each pulse signal fed back from the encoder to the controller 20, the controller 20 issues command signals 25, 26, 27 to the three motors 21, 40, 57, and thus the three motors 21, 40 and 57 are always kept at a normal rotation speed.

On the other hand, the photoelectric switch 28 provided in the passage area of the package of the supply conveyor has a signal 29 of an equal pitch corresponding to the interval of each package 46 passing below the switch.
Are successively input to the controller 20, but if the article 46 being conveyed is lacking and the interval between the articles is enlarged, the controller 2
Two motors 2 with abnormal signals 25 and 26 generated from 0
1 and 57 are stopped, and the movement of the film 60 and the rotary sealers 65 and 66 are stopped until the subsequent package catches up with the previous package. The bypass tube 16 in FIG.
Since there is always a flow of air, when the film is stopped, the inside of the tube film becomes excessively vacuum, and when the operation is started again, the friction between the pipe nozzle 10 and the film becomes large and the film does not advance. At the same time as the stop of 65 and 66, the signal 30 from the controller 20
Then, the second solenoid valve 19 is closed. When the valve closes, air naturally flows into the tube film. However, when the rotation of the film and the rotary sealer is started again, the controller 20 causes the first and second solenoid on-off valves 15 and 19 to move slightly more than usual. Open early. As a result, the air in the tube film is instantly sucked out, and the portion can be cross-sealed by the rotating sealers 65 and 66 which have resumed rotation. Note that the operation status is shown in a flowchart in FIG. That is, as shown in P1,
When the interval between feeds increases, the film and rotating sealer stop.
Control to stop P2 while closing the second on-off valve P3
Each is performed, and only the transport of the packaged goods is continued and expanded.
Narrow the interval. The switch then checks the following
P4 and control P5 for opening the first and second on-off valves
To eliminate excess air in the tube film as soon as possible.
Then, the stopped film and the rotating sealer are activated (P6).
Control is performed.

According to the second aspect of the present invention, when the film and the rotary sealer stopped due to the increase in the interval between the articles to be supplied into the tube film start moving again, the film and the rotary sealer are first moved at a gentle speed and thereafter. Control means is provided to accelerate and start up. According to the present invention, the paused film starts moving slowly to gain time for purging the internal air, and then accelerates to recover the delayed time. The flowchart of this is shown in FIG. That is, as shown in P10,
The film and rotating sealer stop when the supply interval increases
P11, while the second on-off valve closes P12
Are performed, and only the transport of the packaged items is continued and expanded.
Narrow the interval. The switch then switches the subsequent package
Check P13 and the stopped film and rotating sealer.
At the same time as performing the control to slowly rotate P14,
Open both the first and second on-off valves (P15) and open the tube film.
After allowing time for air elimination inside the film,
The roller is gradually accelerated to P16 to fill the package.
The delay of the system and the rotary sealer is corrected.

[0013]

According to the first aspect of the present invention, the stopped film and the rotary sealer start operating again, and the timing at which the pipe nozzle starts vacuuming is advanced with respect to the timing at which the rotary sealer clamps the film. In other words, the vacuum start time is advanced and the air is removed before the sealing is performed. Claim 2
According to the invention, when the stopped film and the rotating sealer start operating again, the film and the rotating sealer are accelerated and started up at a moderate speed thereafter. In other words, the movement of the film and the rotating sealer is made slow to increase the time for removing the vacuum. Therefore, it is possible to prevent the vacuum of the first first bag from becoming loose when the operation is restarted after the supply of the packaged goods is lost.

[Brief description of the drawings]

FIG. 1 is a side view.

FIG. 2 is a plan view.

FIG. 3 is a side view of the deaerator.

FIG. 4 is a sectional view taken along the line IV-IV of the previous figure.

FIG. 5 is a sectional view taken along line VV in FIG. 3;

FIG. 6 is an explanatory diagram of a control unit.

FIG. 7 is an explanatory diagram of a flowchart.

FIG. 8 is an explanatory diagram of a flowchart.

[Explanation of symbols]

10: pipe nozzle, 12: vacuum pump, 13: auxiliary tank, 14: vacuum source, 15: solenoid on-off valve, 1
6: Pipe tube, 17: Flow control valve, 20: Control unit, 28: Switch, 46: Packaged object, 60:
Film, 65, 66 ... Seal bar.

Claims (2)

(57) [Claims] 1. A while placing a number of pipe nozzles for elongated vacuum suction along a track for transporting a package in a tandem state, in manufacturing tube means a strip film which moves to the each material to be packaged the same rectangular direction A packaging device for rounding the packaged material around the pipe nozzle around the packaged nozzle and cross-sealing the tube film between the packaged products by a rotary sealer, and a switch provided on the packaged product conveyance track. Then, the feed interval of each packaged object is detected, and the equal pitch data corresponding to the feed interval is processed by the controller. When the equal pitch data spreads beyond the allowable value , the data interval until the data interval becomes equal. A control device configured to stop the movement of the film and the rotary sealer, wherein a normally closed type first provided in the middle of a connecting pipe connecting the pipe nozzle to a vacuum source. Off valve, and a bypass tube with a small diameter than the previous SL pipe nozzle a tube which bypasses the said first opening and closing valve, the second normally open type in the pipe nozzle provided in the first shut-off valve in series form off valve, and control means wherein the rotary sealers for opening between the first shut-off valve just prior to cross-seal the tube off <br/> Ilm momentarily constant cycle, equal pitch data as the
There control means for closing between the second on-off valve the movement of the film and rotary sealer spread beyond the allowable value is stopped, the timing of nipping the film rotary sealer again started operation film and rotary sealer was stopped again On the other hand, to expedite the first vacuum suction of the pipe nozzle,
A deaeration packaging device comprising: a control unit for releasing both on-off valves early . 2. While a large number of arranged pipe nozzle for an elongated vacuum suction along a track to transport in a tandem state to be packaged, in manufacturing tube means a strip film which moves to the each material to be packaged the same rectangular direction A packaging device for rounding the packaged material around the pipe nozzle around the packaged nozzle and cross-sealing the tube film between the packaged products by a rotary sealer, and a switch provided on the packaged product conveyance track. Then, the feed interval of each packaged object is detected, and the equal pitch data corresponding to the feed interval is processed by the controller. When the equal pitch data spreads beyond the allowable value , the data interval until the data interval becomes equal. A control device configured to stop the movement of the film and the rotary sealer, wherein a normally closed type first provided in the middle of a connecting pipe connecting the pipe nozzle to a vacuum source. Off valve, and a bypass tube with a small diameter than the previous SL pipe nozzle a tube which bypasses the said first opening and closing valve, the second normally open type in the pipe nozzle provided in the first shut-off valve in series form off valve, and control means wherein the rotary sealers for opening between the first shut-off valve just prior to cross-seal the tube off <br/> Ilm momentarily constant cycle, equal pitch data as the
There control means for closing between the second on-off valve the movement of the film and rotary sealer spread beyond the allowable value is stopped, when the film and rotary sealer was stopped starts up again, these films and rotary sealer initially A deaeration packaging device comprising control means for starting up at a gentle speed and then accelerating.