JP3546352B2 - Apparatus for preventing misalignment of articles in horizontal bag making and filling machine - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a position shift preventing device for preventing a position shift of articles supplied at predetermined intervals in a cylindrical film in a horizontal bag making and filling machine employing, for example, a rotary horizontal sealing mechanism. is there.
[0002]
[Prior art]
The articles are sequentially delivered and supplied at predetermined intervals by a supply conveyor into a tubular film which is formed into a tubular shape by a bag making machine and transferred horizontally, and a longitudinal edge of the tubular film to which the articles are supplied. A horizontal bag-making and filling machine that produces a pillow package by applying a vertical seal (center seal) to the overlapping surface of the part and further performing a horizontal seal (end seal) and cutting before and after sandwiching the article of cylindrical film, respectively. Are known.
[0003]
The supply of the articles to the above-mentioned horizontal bag making and filling machine is generally achieved by pushing the articles at a required speed by respective pushing bodies provided at predetermined intervals in an endless chain of a supply conveyor. However, if for any reason, the article is not supplied to any of the corresponding pushing bodies in the supply conveyor, the delivery and supply of the article to the tubular film formed by the bag making machine is temporarily stopped. This results in interruptions, so-called shortages. When this shortage occurs, "empty bags" which are not filled with articles are mixed in each of the packaging bags continuously produced by the packaging machine. There are inconveniences, such as waste, and a separate device for separating and removing the waste. Therefore, when a shortage occurs in a group of articles transported by the supply conveyor, it is necessary to take measures to prevent the occurrence of empty bags beforehand.
[0004]
As the empty bag prevention means, in the packaging machine, a shortage detection sensor detects that a shortage is present in a group of articles transported at a predetermined interval by the supply conveyor, and based on the shortage detection signal, the shortage of the supply conveyor is detected. An operation control for temporarily stopping the operation of the film transfer mechanism and the horizontal seal mechanism while the operation is continued is performed. In this case, if the operation stop and operation start of each mechanism are repeated, at this time, inertia occurs at the time of operation stop and operation start in the film transport mechanism, and vibration occurs in each mechanism. In particular, in the case where the above-described empty bag prevention control is performed during the high-speed operation of the packaging machine, a light article such as a biscuit at the time of stopping and starting the transfer of the film may be displaced in the tubular film. In view of this, auxiliary feeding means such as an endless belt capable of transferring articles in a holding state toward the downstream side through the film between the article transfer mounting surface and the like is provided, and the feeding means allows the articles to be transferred into the cylindrical film. A configuration is adopted in which a lightweight article such as a biscuit to be supplied is stably transported downstream.
[0005]
[Problems to be solved by the invention]
For example, in a horizontal bag making and filling machine that employs a horizontal sealing mechanism having a rotary seal, the auxiliary feeding means cannot be extended in the operation area of the seal, and has dimensions such as biscuits. In the case of packaging small articles, the cylindrical film from the end of holding and transfer of the article by the auxiliary feeding means to the center of rotation of the seal body has at least one or more outside the working range of holding and transferring of the auxiliary feeding means. Articles are present. Therefore, the article is not held by the auxiliary feeding means, and there is a possibility that the article is misaligned when the operation of the film transport mechanism or the horizontal sealing mechanism is stopped or started.
[0006]
As described above, when an article is misaligned in the tubular film, the article is jammed by the seal body, which is a factor of increasing a packaging failure rate. For this reason, there has been a demand for an effective countermeasure for reducing the packaging failure rate related to the positional deviation of the articles based on the above factors.
[0007]
[Object of the invention]
SUMMARY OF THE INVENTION The present invention has been proposed in view of the above-mentioned problems inherent in the conventional technology, and has been proposed in order to solve the problem appropriately. It is an object of the present invention to provide an apparatus for preventing misalignment of articles in a horizontal bag making and filling machine which can prevent misalignment of articles supplied in a cylindrical film from a transfer end to a horizontal sealing mechanism.
[0008]
[Means for Solving the Problems]
In order to solve the above-mentioned problems and appropriately achieve the intended purpose, an article position deviation prevention device in the horizontal bag making and filling machine according to the present invention includes:
A horizontal sealing mechanism that seals and cuts in a horizontal direction before and after sandwiching an article of a tubular film in which articles are delivered and supplied at predetermined intervals by a supply conveyor, and a tubular seal disposed upstream of the horizontal sealing mechanism. In a horizontal bag making and filling machine having auxiliary feeding means for holding and transferring the article in the film to the downstream side in a pressed state together with the film,
The auxiliary feeding means is set so as to be able to hold the article from a delivery position of the article from the supply conveyor to the cylindrical film to a predetermined position not interposed in the operating area of the seal body in the horizontal sealing mechanism,
From the end of holding and transferring the article by the auxiliary feeding means to the operating area of the seal body in the horizontal sealing mechanism, the outlet of the pressure air blowing means is disposed so as to be directed to the article transfer path, and blows out from the outlet. It is characterized in that a tubular film is formed so as to surround the periphery of the article by the applied pressure air.
[0009]
[Action]
The articles delivered and supplied into the tubular film at predetermined intervals by the supply conveyor are held and transferred together with the film by the auxiliary feeding means in a pressed state toward the horizontal sealing mechanism. The outlet of the pressurized air blowing means is arranged to face the article transfer path from the end of holding and transfer of the article by the auxiliary feeding means to the operating region of the seal body in the horizontal sealing mechanism, and the pressure is supplied from the blowout port to the article transfer path. By blowing out the air, the tubular film is deformed so as to surround the periphery of the article, and the misalignment of the article can be prevented. That is, in the case where the empty bag prevention control is performed, it is possible to appropriately prevent the articles not held by the auxiliary feeding means from being displaced in the tubular film when the transfer of the film is stopped or started. Can be.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, an apparatus for preventing misalignment of an article in a horizontal bag making and filling machine according to the present invention will be described below with reference to the accompanying drawings by taking a preferred embodiment. In the horizontal bag making and filling machine 10 shown in FIG. 1, the strip film 12 pulled out from the raw film roll 14 on which the strip film 12 is wound with a required diameter through the feeding rollers 16, 16 is supplied to the bag making machine 18. And is formed into a cylindrical shape. On the upstream side of the bag making machine 18, the articles 24 are transferred at regular intervals to the tubular film 12 a formed into a cylindrical shape by the bag making machine 18 by a large number of pushing bodies 22 attached to the endless chain 20 at predetermined intervals. A supply conveyor 26 for supplying is provided.
[0011]
On the downstream side of the bag making device 18, a pair of feed rollers 28, 28 (only one is shown) for nipping the longitudinally overlapping end portion of the cylindrical film 12a and transporting the film 12a toward the downstream side. A vertical sealing mechanism 32 is provided below the article transfer path. The vertical sealing mechanism 32 includes a seal roller 30, 30 located downstream of the rollers 28, 28. Then, the vertical sealing mechanism 32 is configured to apply a vertical seal to the longitudinally overlapped edge of the cylindrical film 12a to which the article 24 is supplied.
[0012]
A transport bed 36 that supports the bottom surface of the article 24 supplied to the cylindrical film 12a via a film is horizontally disposed between the bag making device 18 and a position where a horizontal sealing mechanism 34 described later is disposed. Is established. A slit 36a is formed in the transport bed 36 along the article transfer direction (see FIG. 2), and a longitudinal overlapping edge of the tubular film 12a extending downward from the slit 36a The rollers 28, 28 and the seal rollers 30, 30 are configured to be sandwiched. That is, the article 24 supplied to the tubular film 12a is transported downstream with the transport of the tubular film 12a while being placed on the transport bed 36.
[0013]
As shown in FIG. 1, a horizontal sealing mechanism 34 for horizontally sealing and cutting the cylindrical film 12a is provided downstream of the transport bed 36. The horizontal seal mechanism 34 includes a pair of upper and lower seals 38, 38, which rotate at irregular speeds by a drive mechanism (not shown) such as a servomotor, above and below the tubular film 12a. Then, while the seal bodies 38, 38 make one rotation synchronously, the tubular film 12a is transported by one cut pitch, so that the transverse sealing and cutting are performed before and after the article 24 of the tubular film 12a is sandwiched. It has become so.
[0014]
An out-of-stock detecting sensor 40 composed of, for example, a light emitting and receiving element is provided upstream of the delivery conveyor 26 at a position where the article 24 is transferred to the tubular film 12a. The presence or absence of the article 24 arriving in the area can be detected. The missing item detection sensor 40 is configured to detect the article 24 passing through the detection area each time and output a detection signal to the control device 42. The control device 42 responds to the input of the shortage detection signal from the shortage detection sensor 40 and adjusts the timing at which the article 24 is to be delivered to the cylindrical film 12a. , 16 and feed rollers 28, 28, etc., and an operation stop signal for temporarily stopping the operation of the horizontal seal mechanism 34 is issued. If the shortage detection signal from the shortage detection sensor 40 is not input to the control device 42 after the next cycle (the cycle in which the pusher 22 moves by one pitch), the operation of the film transport mechanism and the horizontal seal mechanism 34 is performed. Is set to be issued from the control device 42. That is, the film transfer mechanism in the horizontal bag making and filling machine 10 of the embodiment is configured to control a film transfer control signal (film transfer stop signal, film transfer stop signal, In response to the (transfer start signal), the stop and start of the transfer of the film are repeated, and the horizontal seal mechanism 34 performs an empty bag prevention control operation in which the operation is temporarily stopped in accordance with the stop and the start of the transfer of the film. , So that empty bags are not generated.
[0015]
As shown in FIG. 1, an endless conveyor (endless conveying body) 44 as an auxiliary feeding means is disposed above the conveying bed 36. The conveyor 44 is provided with a plurality of sponge-like or brush-like pressing members 46 capable of elastically pressing the article 24 with the transport bed 36 via a film. Then, the endless conveyor 44 is fed out so that the tubular film 12a is not loosened while the upper surface of the article 24 placed on the transport bed 36 is pressed downward by the pressing member 46 via the film. The rotation is controlled at a speed slightly higher than the film pulling set speed by the rollers 16, 16, and functions to auxiliary-feed the article 24 without shifting the position. The endless conveyor 44 has an operating area in which the end of holding and transferring the article 24 in a pressed state by the pressing member 46 and the transport bed 36 does not interfere with contact when the sealing bodies 38 of the horizontal sealing mechanism 34 rotate. It extends to an outside position (outside the rotation locus of the seal bodies 38, 38).
[0016]
A pressurized air blowing means 48 is provided between the end of holding and transferring the endless conveyor 44 and the position just before the range (operation area) of the rotation trajectory of the seal bodies 38, 38. As shown in FIG. 2, the pressure air blowing means 48 is provided with a pair of nozzles 50, 50 which are separated in a width direction intersecting the article transfer direction and connected to an air supply source (not shown). 50a is arranged so as to face the article transfer path on the transport bed 36. As shown in FIG. 3, the outlet 50a of each nozzle 50 has a required length in the article transfer direction, and has a cylindrical shape facing the upper side of the article 24 by the pressure air blown from the outlet 50a. The film 12a is deformed so as to surround the article 24. That is, the pressure air blowing means 48 functions to prevent the position of the article 24 facing the area not held by the endless conveyor 44 in the tubular film 12a. Note that the number and positions of the nozzles 50 can be appropriately changed according to the shape and size of the article 24.
[0017]
The blowing of the pressure air from the blowing port 50a of the pressure air blowing means 48 is controlled in accordance with a film transfer stop signal and a film transfer start signal issued from the control device 42. The blowing of the pressure air is started shortly before the transfer of the film is stopped, and the blowing of the pressure air is stopped after a lapse of a predetermined time from the start of the transfer of the film.
[0018]
Operation of the embodiment
Next, the operation of the apparatus for preventing misalignment of articles in the horizontal bag making and filling machine described above will be described.
[0019]
The pushing body 22 of the supply conveyor 26 pushes each corresponding article 24 horizontally toward the downstream side, and is formed into a tubular shape by the bag making device 18 and transferred to the downstream side at a required speed. The articles 24 are delivered and supplied one by one into the film 12a. The article 24 placed on the transport bed 36 via a film is transported downstream with the transport of the tubular film 12a by the film transport mechanism. The article 24 is auxiliary-transferred toward the horizontal sealing mechanism 34 in a state where the article 24 is pressed between the conveyor 44 and the transport bed 36 via the film by the endless conveyor 44, and a holding transfer area between the conveyor 44 and the transport bed 36. Is prevented from being displaced. Then, the cylindrical film 12a transferred to the horizontal sealing mechanism 34 is horizontally sealed and cut by the pair of upper and lower seals 38, 38 before and after sandwiching the article 24, and a pillow package is obtained.
[0020]
The shortage detection sensor 40 constantly monitors the presence or absence of the article 24 that sequentially passes through the detection area, and when a shortage detection signal from the shortage detection sensor 40 is input to the control device 42, the control is performed. The operation stop signal is issued from the device 42, and the operation of the film transport mechanism and the horizontal seal mechanism 34 is temporarily stopped at the timing when the article 24 is to be delivered to the tubular film 12a. If the shortage detection signal from the shortage detection sensor 40 is not input to the control device 42 after the next cycle, an operation start signal is issued from the control device 42 and the operation of the film transfer mechanism and the horizontal seal mechanism 34 is performed. By starting the operation, the occurrence of empty bags is prevented.
[0021]
Further, the blowing of the pressure air from the blowing port 50a of each nozzle 50 in the pressure air blowing means 48 is started shortly before the transfer of the film is stopped, and the sealing bodies 38, 38 are held from the end of holding and transferring the endless conveyor 44. 2 and 3, the cylindrical film 12a is deformed to surround the article 24 as shown in FIGS. Then, after a lapse of a predetermined time from the start of the transfer of the film, the blowing of the pressure air from the blowing port 50a of the pressure air blowing means 48 stops. That is, it is prevented that the article 24 facing the area not held by the endless conveyor 44 is displaced due to the stoppage of the transfer of the film, the inertia at the start of the transfer, the stop of the operation of each mechanism 34, and the vibration accompanying the start of the operation. .
[0022]
[Modification example]
The pressure air blowing means 48 for blowing the pressure air to the cylindrical film 12a is not limited to the configuration of the above-described embodiment. For example, as shown in FIGS. A single chamber 52 having a width longer than that of the article 24 is provided, and a plurality of outlets 52a formed in the bottom of the chamber 52 facing the article transfer path and spaced apart in the width direction to the cylindrical film 12a. Pressure air, or various other pressure air blowing means.
[0023]
In the embodiment, the case where the pressure air is continuously blown out from the pressure air blowing means during the film transfer suspension period has been described. If the transfer suspension period exceeds a predetermined allowable period, the blowing of the pressure air is started shortly before the transfer of the film is stopped, and the blowing is stopped after a predetermined time has elapsed. Then, the blowing of the pressure air may be started again, and the blowing may be stopped after a lapse of a predetermined time from the start of the transfer. In this case, the amount of air consumption can be minimized. During operation of the horizontal bag making and filling machine, pressure air may always be blown out. Further, when the film transfer suspension period is within a preset allowable period, the outlet of the pressure air blowing means 48 after a predetermined period has elapsed regardless of the film transfer start signal from the control device 42. The blowing of the pressure air from 50a may be stopped.
[0024]
The endless conveyor as the auxiliary feeding means has a configuration in which the article is elastically pressed through the film by the transport bed and is held and transported to the downstream side, but instead of the transport bed, the bottom of the article is supported. An endless conveyor composed of a belt conveyor or the like that actively transports articles toward the downstream side, and other article placement means can be employed. Further, a system may be used in which the side surfaces of the articles are elastically sandwiched by a pair of auxiliary feeding means such as endless conveyors provided on both sides of the article transfer path via the film and transferred.
[0025]
The horizontal bag making and filling machine is not limited to a configuration in which the operation of each mechanism is stopped and started by the above-described empty bag prevention control. For example, in response to a pause request signal from a previous process or a subsequent process, the packaging machine Each of the mechanisms is configured to be controlled to repeat the operation stop and operation start, and in response to various other operation conditions, at least an operation controlled so as to repeatedly stop and start the transfer of the film may be used. In this case also, the apparatus for preventing misalignment of the article of the present invention suitably works. Further, in the embodiment, the rotary operation system is exemplified as the seal body of the horizontal seal mechanism, but a box motion system may be used.
[0026]
【The invention's effect】
As described above, according to the apparatus for preventing misalignment of articles in the horizontal bag making and filling machine according to claim 1 of the present invention, even when the packaging machine is operating at a high speed, the holding and transfer end of the auxiliary feeding means is maintained. Items facing the inside of the tubular film up to the horizontal sealing mechanism, especially objects with small dimensions such as biscuits, may cause vibrations caused by stopping and starting each mechanism, inertia occurring at the stop of film transfer, and start of transfer It can be effectively prevented that the position shifts due to the above. Further, in the article position deviation preventing apparatus according to the second aspect, since the pressure air is blown out in accordance with the stop and the start of the transfer of the film, the consumption of the air can be suppressed.
[0027]
In the article position deviation preventing apparatus according to the third aspect, it is possible to effectively prevent the position deviation of the article when the empty bag prevention control for temporarily stopping the film transfer is performed by the presence / absence detection of the article by the shortage detection sensor. it can. Further, in the article position preventing apparatus according to the fourth aspect, continuous blowing of the pressure air exceeding the preset allowable period can be prevented, so that the air consumption can be further reduced.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram of a horizontal bag making and filling machine that employs an article position shift prevention device according to a preferred embodiment of the present invention.
FIG. 2 is a front view showing a pressure air blowing unit according to the embodiment.
FIG. 3 is a side view showing a pressure air blowing unit according to the embodiment.
FIG. 4 is a front sectional view showing a pressure air blowing unit according to a modification.
FIG. 5 is a side sectional view showing a pressure air blowing means according to a modification.
[Explanation of symbols]
12a Cylindrical film 24 Article 26 Supply conveyor 34 Horizontal seal mechanism 38 Seal body 40 Shortage detection sensor 44 Endless conveyor (auxiliary feeding means)
48 pressure air blowing means 50a blowing port 52a blowing port

Claims (4)

A horizontal sealing mechanism (34) for performing horizontal sealing / cutting before and after sandwiching the article (24) of the tubular film (12a) in which the article (24) is delivered and supplied at predetermined intervals by the supply conveyor (26), An auxiliary feeding means (44) disposed upstream of the horizontal sealing mechanism (34) and holding and transporting the article (24) in the tubular film (12a) to the downstream side in a pressed state together with the film. In bag making and filling machines,
The auxiliary feeding means (44) extends from an article delivery position from the supply conveyor (26) to the tubular film (12a) to a predetermined position not interposed in the operating area of the seal body (38, 38) in the horizontal seal mechanism (34). It is set to be able to hold the article (24) over
From the end of holding and transfer of the article (24) by the auxiliary feeding means (44) to the operation area of the seal body (38, 38) in the horizontal sealing mechanism (34), the outlet of the pressure air blowing means (48) (50a, 52a) are disposed facing the article transfer path, and the cylindrical film (12a) is formed so as to surround the article (24) by the pressure air blown out from the outlets (50a, 52a). An apparatus for preventing misalignment of an article in a horizontal bag making and filling machine. The horizontal bag making and filling machine (10) is operated and controlled so that the transfer of the film and the start of the transfer are repeated in response to at least the transfer control signal of the film. 2. The apparatus for preventing misalignment of articles in a horizontal bag-making and filling machine according to claim 1, wherein the apparatus is configured to blow out pressurized air from the outlets (50a, 52a) of the outlet means (48). The film transfer control signal is a film transfer stop signal in response to a shortage detection signal from a shortage detection sensor (40) that detects the presence or absence of an article (24) transferred by the supply conveyor (26). 3. The apparatus for preventing misalignment of articles in a horizontal bag-making and filling machine according to claim 2, wherein the apparatus is controlled so as to issue a film transfer start signal when the shortage detection signal is not inputted after the next cycle. When the transfer suspension period of the film exceeds a preset allowable period, the blowout of the pressure air from the blowout ports (50a, 52a) of the pressure air blowout means (48) is set to be stopped. 3. An apparatus for preventing misalignment of articles in the horizontal bag making and filling machine according to 2.

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