JP3971515B2 - Grip device for packaging bag of packaging equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a gripping device for a packaging bag of a packaging device that continuously performs bagging and packaging such as rice and other granular materials.
[0002]
[Prior art]
Various devices are known for packaging devices for bagging and packaging such as granular materials, and in order to increase the packaging speed, bag feeding, opening of packaging bags, charging of granular materials into packaging bags, For example, there is an endless rotating traveling body type packaging device disclosed in Japanese Patent Application Laid-Open No. 8-253211 that can perform more of a series of packaging operations of sealing an opening and discharging a product at the same time. .
[0003]
Such an endless rotating traveling body type packaging device is provided with a plurality of pairs of grip bodies intermittently on a pair of chain conveyor type traveling bodies so that each pair of grip bodies can be circulated as the traveling bodies move. Each station of bag, opening, filling, top seal and discharge is moved in order, and each station is provided with a trajectory guide that regulates the transfer trajectory of the grip body, and a pair of grip bodies at the bag feeding station Hold both sides of the tube film supplied in a suspended state with a pair of grip bodies to form a packaging bag, and horizontally hold the packaging bag to the remaining stations while holding the formed packaging bag with the grip body. It is intended to be transported. In this way, in the device that performs the packaging operation while horizontally moving the packaging bag in a suspended state, when the powder is filled, a large weight is added to the packaging bag, so gripping both side edges of the packaging bag It is a very important factor to hold it securely with the body.
[0004]
And when supplying a tube film at a bag supply station of such a packaging device and making a packaging bag, the interval between the pair of grip bodies is set to the width size of the tube film, and the grip width of each grip body is set. In other words, the grip margin at both side edges of the tube film is given a certain margin in advance, and the both side edges are sandwiched within the range of the grip width with this margin. And after pinching the both-sides edge part of a tube film, a tube film is cut | disconnected to predetermined length and a packaging bag is formed.
[0005]
By the way, as the material of the tube film, a synthetic resin material such as polyethylene is mainly used, and a material obtained by forming this synthetic resin material into a tube shape by a so-called inflation method is used. The tube film itself has a property of easily expanding and contracting, and may have gentle meandering in the longitudinal direction that occurs during molding. In addition, when the tube film is wound into a roll shape, if the winding state is defective, the tube film may meander when the tube film is sent out from the roll. Furthermore, in the case of laminating different synthetic resin materials such as, for example, nylon and polyethylene laminated, undulation may occur at the side edge due to the difference in thermal expansion coefficient. Therefore, when the tube film having such properties is supplied to the packaging device, the conventional method cannot always supply the fixed position between the pair of grip bodies, and a slight positional error occurs.
[0006]
Furthermore, recently, it has been strongly desired to process large, medium, small, and various size packaging bags such as 10, 5, 2, and 1 kg with a single packaging device, for example, as the size of rice packaging bags. However, when packing bags of various sizes with a single packaging device, securing a sufficient grip width at both side edges of the tube film as in the past, the smaller the size of the packaging bag, It becomes difficult. Therefore, in order to handle various types of packaging bags with a single packaging device, the predetermined positions on both side edges can be pinched and held accurately and reliably by a pair of grip bodies even if the packaging bag size, particularly the width size, is changed. Such technology has become indispensable.
[0007]
[Problems to be solved by the invention]
The present invention has been made in the background as described above, and even if a tube film having various width sizes is supplied in a suspended state between a pair of grip bodies, both side edges of the tube film and the packaging bag are provided. The object is to provide a technique that can be securely held and held by a grip body.
[0008]
[Means for Solving the Problems]
In order to solve the above-described problems, the present invention provides a pair of grip bodies intermittently provided on a pair of chain conveyor type traveling bodies so that each pair of grip bodies can be circulated as the traveling bodies move. Each station of bag, opening, filling, top seal and discharge is moved, and each station is provided with a trajectory guide that regulates the transfer trajectory of the grip body, and between the pair of grip bodies at the bag feeding station. A tube bag is formed by sandwiching both side edges of the tube film to be supplied in a suspended state with a pair of grip bodies, and the packaging bags are sequentially leveled to the remaining stations while the formed packaging bag is sandwiched between the grip bodies. For the packaging bag grip device of the packaging device to be transported, the pair of grip bodies in the bag feeding station approach or separate from each other via the track guide. Each gripping part is movable, and a sensor for detecting the edge position of the side edge of the tube film is connected to the trajectory guide of the bag feeding station via a frame at a proximity position above or below the clamping part. The frame is provided with a driving means for moving and positioning the grip portion of the grip body together with the sensor to a grip margin position corresponding to the edge position of the tube film side edge detected by the sensor.
[0009]
According to the packaging bag grip device of the present invention, the edge positions of the left and right side edges of the tube film supplied in a hanging state at the bag feeding station are detected by the edge position detection sensors, and the feeding is performed in accordance with the detection signal. The track guide in the bag station is moved by the driving means, and the gripping portion of the grip body regulated by the track guide is adjusted and moved to the respective predetermined grip margin positions at the left and right side edge portions of the packaging bag. Thus, even if the meandering of the tube film supplied and undulations occur at the side edge portions thereof, the gripping portion of the grip body can securely hold the predetermined grip margin positions at the left and right side edge portions. Furthermore, when a small packaging bag size is used, the allowable width that can be clamped at both side edges becomes narrow, but according to the present invention, the side edge edge position is accurately detected and the position of the clamping part is accurately adjusted. Therefore, even if a wide, medium and small size and various sizes of packaging bags are supplied to the packaging device, each pair of grip bodies can follow the sensor detection according to each width size. By changing the position between each clamping part, it becomes possible to hold | maintain with a grip body reliably.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described. First, the whole packaging apparatus will be described with reference to FIG. A pair of chain conveyor type traveling bodies 1 that run endlessly in the direction of arrow X in a horizontal state in parallel are provided. Each of the traveling bodies 1 is provided with a plurality of pairs of grip bodies 2 that are intermittently attached at regular intervals. The pair of grip bodies 2 are positioned so that the grip body 2 of one traveling body 1 and the grip body 2 of the other traveling body 1 face each other. For convenience of explanation, in the following explanation, one grip body 2 of the pair of grip bodies 2 will be mainly described, and if necessary, the other grip body 2 will be referred to. A bag feeding station 3, an opening station 4, a filling station 5, and a seal station 6 are provided in order from the left to the right along the upper side of the traveling body 1, and a bag support mechanism 7 is provided below the traveling body 1. Is provided. The bag feeding station 3 is provided with a pinch roll 8 for supplying the rolled tube film F in a suspended state, and below it is a film cutting means serving also as a sealing means for providing a bottom seal of the packaging bag P. 9 is arranged.
[0011]
Next, as shown in FIG. 1 or FIG. 2, the grip body 2 includes a pair of clamping members 10 that are rotated in the direction indicated by the arrow Y in FIG. The rotating mechanism that causes the holding member 10 to open and close includes a pair of link portions 11 having one end connected to each of the pair of holding portions 10 and the other end connected to each other, and an arrow connected to both the link portions 11. The connecting rod 12 is configured to be movable back and forth in the directions indicated by Za and Zb, and a spring 13 that urges the connecting rod 12 in the direction indicated by the arrow Zb. By pushing the connecting rod 12 with the pressing means 14 against the urging force of the spring 13 and moving it in the direction of the arrow Za, both the clamping portions 10 are rotated to the open state indicated by the imaginary line in the figure, and the pressing means 14 When the pressing force is released, both the clamping portions 10 are returned to the closed state by the urging force of the spring 13.
[0012]
Further, in the pair of grip bodies 2, the holding portions 10 can be moved in the directions approaching and separating from each other via the track guide 15. For this purpose, the grip body 2 is attached to the traveling body 1 via a slide rail 17 that is slidably supported on the guide frame 16 so that the entire body can be moved forward and backward as indicated by an arrow V. This forward / backward movement is made via a guide receiver 18 attached to the slide rail 17. Specifically, the guide receiver 18 has a structure in which a bearing 19 is attached to the tip of the support rod 20, and is guided by a bowl-shaped track guide 15 with which the bearing 19 is engaged. The advancing and retreating is performed according to the movement in the direction.
[0013]
The track guide for regulating the transfer track in the packaging device for the grip body 2 will be further described. FIG. 5 shows a partial schematic plan view of the trajectory guide 15. FIG. 5 shows a trajectory guide 15 that regulates the transfer trajectory of one grip body 2 of the pair of grip bodies 2 so that another trajectory guide 15 having a symmetrical trajectory faces this. It is also arranged on the other side. The trajectory guide 15 is formed by connecting a plurality of trajectory guides 15a to 15g as shown in FIG. 5, and a circle indicated by a broken line indicates a bearing 19 of the guide receiver 18, and each station 3, 4 5 and 6 correspond to the positions of the grip body 2 (arrows S3, S4, S5, S6). When the width size of the tube film F to be supplied is changed, the track guide 15 is moved between the pair of grip bodies 2 in accordance with the width size by moving both the track guides 15 arranged symmetrically. The distance can be adjusted.
[0014]
The track guide 15c for regulating the track of the grip body 2 in the bag feeding station 3 is movable at one end in the direction of the arrow U, and the track guide 15b continuing to the track guide 15c can follow the movement of the track guide 15c. ing. 6 and 7 show an enlarged bottom view and a side view of the trajectory guide 15c that is movable in the arrow U direction. The track guide 15 c has an L-shaped plate 21 attached to the side surface of the bowl-shaped ceiling, and a guide groove 22 is formed on one end side of the plate 21. The guide grooves 22 are engaged with the guide pins 24 with both ends of the plate 21 being sandwiched between the support plates 23. Since the plate 21 is movable between the support plates 23 while being regulated by the guide pins 24, one end side of the track guide 15c (the side continuing to the track guide 15b) moves in the arrow direction U. be able to. Although not shown, the track guide 15b has the same mechanism as the track guide 15c, and can follow the movement of the track guide 15c.
[0015]
Further, a connecting / moving portion 27 connected to the driving means 26 is attached to the upper portion of the trajectory guide 15c at the position of the bag feeding station 3 via the frame 25 as shown in FIGS. By attaching a sensor mounting arm 28 to the portion 27, a photosensor 29 for edge detection is arranged in the vicinity of the side edge A of the tube film F supplied in a suspended state and immediately above the clamping member 10. It is.
[0016]
Next, the operation state of the grip body 2 in the bag feeding station 3 will be described. The pair of grip bodies 2 are transferred from the lower side to the upper side of the traveling body 1 in accordance with the non-rotating rotation of the traveling body 1, and the tube film F is supplied in a suspended state by the track guide 15b in the bag feeding station 3. Guided to the position. Until this position is reached, the pair of grip bodies 2 are transported in a state avoiding interference with the hanging packaging bag P, that is, in a state where the distance between the pair of grip bodies 2 is wider than the bag width of the packaging bag P. The holding part 10 of the grip body 2 moved to the position where the tube film F is supplied is opened by the pressing means 14, and the side edge part A of the tube film F hangs down between the holding parts 10. .
[0017]
When the side edge portion A of the tube film F is suspended between the sandwiching portions 10 of the grip body 2, the edge 30 is detected by the photo sensor 29 disposed above the sandwiching portion 10. As shown in FIG. 1, a pair of photosensors 29 is provided so as to sandwich the edge 30, and the position of the edge 30 of the tube film side edge A when the tube film F is located between the photosensors 29. The “grip allowance” position that matches the position is determined. Even if the tube film F meanders or waviness occurs in the side edge portion A, the driving means 26 is activated in accordance with the edge detection signal from the photosensor 29, and the position of the track guide 15c is adjusted by the connection moving portion 27. The edge 30 is always present between the two photosensors 29. Position adjustment in accordance with the position of the edge 30 of the tube film F is performed by each of the pair of grip bodies 2, so that each holding portion 10 can securely hold the left and right side edge portions A of the tube film F.
[0018]
【The invention's effect】
As described above, according to the present invention, even if the meandering of the tube film or the undulation of the side edge portion is generated, the edge position is detected by the sensor and the position of the grip body is adjusted, so that the tubes of various width sizes are always used. Needless to say, it can be applied to the film, meandering of each tube film and the waviness of the side edge, and the grip body can hold and hold the specified position at the side edge of the packaging bag. The packaging bag can be stably transferred to each station such as opening, filling, sealing, etc. in the state, and the operation at each station can be performed.
[Brief description of the drawings]
FIG. 1 is a front view of a grip device for a packaging bag according to the present embodiment.
FIG. 2 is a plan view of the gripping device for a packaging bag in the present embodiment.
FIG. 3 is a side view of a main part of a grip device for a packaging bag according to the present embodiment.
FIG. 4 is a schematic side view of the packaging device according to the present embodiment.
FIG. 5 is a schematic plan view of a track guide.
FIG. 6 is an enlarged plan view of a track guide.
FIG. 7 is an enlarged side view of a trajectory guide.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Traveling body 2 Grip body 3 Bag supply station 8 Pinch roll 10 Nipping part 15a-g Track guide 16 Guide frame 17 Slide rail 18 Guide receiving body 21 Plate 22 Guide groove 23 Support plate 24 Guide pin 25 Frame 26 Drive means 27 Connection movement Member 28 Sensor mounting arm 29 Photosensor 30 Edge P Packaging bag A Side edge

Claims (1)

A plurality of pairs of grip bodies are provided intermittently on a pair of chain conveyor type traveling bodies so that each pair of grip bodies can be circulated as the traveling bodies move, and each of bag feeding, opening, filling, top sealing and discharging Each station is provided with a trajectory guide that regulates the transfer trajectory of the grip body at each station, and both side edges of the tube film supplied in a suspended state between the pair of grip bodies at the bag feeding station. In the packaging bag grip device of the packaging device for horizontally transferring the packaging bag sequentially to each remaining station while sandwiching the formed packaging bag with the grip body by sandwiching the part with a pair of grip bodies,
The pair of grip bodies in the bag feeding station can move each clamping part in the direction of approaching / separating via the trajectory guide,
A sensor for detecting the edge position of the side edge of the tube film is connected to the trajectory guide of the bag feeding station via the frame at a proximity position above or below the clamping portion.
The frame is provided with a combination of driving means for moving and positioning the grip portion of the grip body together with the sensor to a grip margin position corresponding to the edge position of the side edge portion of the tube film detected by the sensor. Grip device for packaging bags.

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