JP2522824Y2 - Packaging machine - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention supplies a packaging film drawn from a roll body to a packaging portion position to cover a packaged object, and a film-wrapped packaged object. In particular, the present invention relates to a packaging machine provided with a film no-state detection function.

[Conventional technology]

Conventionally, a roll body, a film supply device for supplying a packaging film drawn from the roll body to a packaging unit position, a packaged object supply device for supplying a packaged object to the packaging unit position, and the packaging unit position Japanese Patent Publication No. 55-48015, Japanese Unexamined Patent Application Publication No. 61-48015 discloses a packaging machine provided with a film covering device for wrapping the packaged object by the packaging film and an unloading device for unloading the packaged object. -164913.

[Problems to be solved by the invention]

In the above prior art, the film continuously drawn from the roll body is supplied to the position of the wrapping section and covered, and the loaded wrapped articles are automatically and sequentially carried out. It is important to accurately detect the absence of the film wound on the body, and if this detection is inaccurate, even though the film is not supplied, the packaged material is supplied to the packaging part position and the packaging operation is performed. There is a problem that many defective products are generated because they are carried out later. In order to solve this problem, a photoelectric switch is used that has a light-emitting element and a light-receiving element sandwiching a film. However, since the light transmittance varies depending on the type of film, etc., it is possible to accurately detect the absence of the film. It is difficult to perform the detection, and the detection operation is unstable. Furthermore, when a new roll body is set, a guide plate must be connected to the start of the film to feed the start of the film to the position of the packaging section, and then the guide plate must be cut off before starting the packaging operation. And complicated work was required.

Therefore, an object of the present invention is to provide a packaging machine capable of accurately detecting the absence of a film.

[Means for solving the problem]

The present invention relates to a roll body, a film supply device for supplying a packaging film drawn from the roll body to a packaging unit position, a packaged object supply device for supplying a packaged object to the packaging unit position, and the packaging unit. A film wrapping device that wraps the wrapped object at the position with the wrapping film, and a wrapping machine including an unloading device that unloads the wrapped wrapped object, wherein the roll body and the film supply device A conductive fixed contact member disposed in the lower part of the packaging film in the middle of the film path between the conductive film and a flexible member movably provided vertically above the packaging film corresponding to the fixed contact member; In the state with a film, the movable contact member contacts the upper surface of the film and is opened, and in the state without the film, the movable contact member contacts the fixed contact member. Those provided with the closing to a film-free state detecting switch means.

[Action]

According to the above configuration, when the film is present, the packaging film is sent in a state where the flexible movable contact member is in contact with the upper surface of the film, and the film absence detection switch means is opened via the packaging film. On the other hand, when the packaging film wound around the roll body runs out, the movable contact member moves downward and comes into contact with the fixed contact member, thereby closing the film state detection switch means.

〔Example〕

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

FIGS. 1 to 6 show a packaging machine for packaging objects to be packaged, in particular foodstuffs and other products placed in trays or other containers, with a stretchable plastic film such as polyvinylidene chloride, a so-called stretch film. .

4 and 5 show an outline of the overall structure of the stretch film wrapping machine, and the front side of the main body frame 1 has a wrapped object 3 extending to the lower part of the wrapping part 2 which is a substantially intermediate portion of the main body frame 1. Is provided with a conveyed object supply device A provided with a conveyor 4 for transporting the products.

At the supply side end of the conveyor 4, a receiving table 5 for supplying and placing the articles 3 to be packaged by the conveyor 4 is arranged, and the receiving table 5 is connected to a lift 6 which is moved up and down by a drive unit as appropriate, and A cradle elevating device B that stretches and holds the stretch film when the cradle 5 is raised is formed.

On the rear side of the main body frame 1, a roll body 8 in which a stretch film 7 is wound in a roll shape is rotatably held. The roll body 8 is pulled out from the roll body 8 and is guided by a guide roll 9A.
A film supply device C for sandwiching the both end portions of the stretch film 7 guided by the above with a pair of upper and lower endless belts 9 and transferring it to the position of the wrapping portion 2 is disposed in the front-rear direction on both upper sides of the main body frame 1. . At the end of the endless belt 9 on the insertion side of the stretch film 7, a film cutting device D comprising a cutter 10 for perforating the stretch film 7 in the width direction of the stretch film 7 and film retainers 11 provided on both sides of the cutter 10. Is provided.

On the wrapping portion 2 side of the main body frame 1, there are provided a rear folding member 12 which reciprocates along the length direction of the film 7 and a left and right folding member 13 which can be opened and closed with respect to the width direction of the film 7. The film folding device E, which is a film covering device that cuts the film 7 from the perforated position of the film 7 with the movement of the bodies 12 and 13 and folds the film 7 on the bottom surface of the package 3 pushed up by the cradle elevating position B, is provided. Is provided.

On the upper side of the main body frame 1, an unloading member 14 that moves forward by contacting the upper surface of the package 3A, and a heater 15A that closely attaches the film 7 at the bottom of the package 3A while placing and unloading the package 3A. Is provided with a carry-out belt F provided with a transfer belt 16 and a transfer conveyor 16.

Fig. 6 (A) shows the packaged items 3 such as trays containing products.
As shown in (B), the conveyor 4 of the packaged article supply apparatus A transfers the sheet from the front side of the main body frame 1 to a position substantially below the middle of the packaging section 2 and supplies and places it on the receiving table 5. A stretch film 7 pulled out of the roll body 8 by the film supply device C and guided by the guide roll 9A at the same time as the transfer of the packaged object 3 is a pair of upper and lower endless shapes from the rear side of the main body frame 1 toward the position of the packaging section 2. The film is transported while being sandwiched by the belt 9, and a perforation 17 is formed by the cutter 10 of the film cutting device D during the transportation. In this manner, the perforation 17 is formed as shown in FIGS. 6A and 6B. A series of stretch films 7 is further transferred to the packaging unit 2.
Transferred to position. In this case, the end of the film 7 is located at a position below the carry-out belt 15 and a pair of film end fixing devices G
Are fixed by the stopper members 18, 18A.

In this way, as shown in FIG. 6 (B), the article to be packaged 3 is supplied onto the cradle 5, and a series of stretch films 7 with perforations 17 are supplied to the packaging section 2, and the ends thereof are In the state where the film end fixing device G is fixed by the stopper members 18 and 18A, the receiving table 5 is raised by the lift 6 of the receiving table elevating device B as shown in FIGS. The supplied film 7 is pushed up from below and stretched, and then the rear folded body 12 and the left and right folded bodies 13 slide along the bottom surface of the pushed-up packaged object 3 and cut off from the perforations 17. Fold the edge from three sides. After that, the end of the film 7 is released from the stopper members 18 and 18A, and is fed onto the carry-out belt 15 heated by the heater 15A by the carry-out member 14, and by this transfer, before the film 7 released from the stopper members 18 and 18A. Tray edge 19
And then carried out while being brought into close contact with the heat of the carry-out belt 15 and transferred by the transfer conveyor 16. Note that the discharge belt 15 is formed so as to surround a heating plate having a built-in heater 15A.
A sheathed heater may be built in itself, and its heating means may be appropriately selected.

Next, the film state detection switch means will be described with reference to FIGS.

An insulative lower support rod 20 is provided on the side surface of the main body frame 1 so as to be positioned below the stretch film 7 guided by the upper guide roll 9A, in parallel with the guide roll 9A. Conductive fixed contact member 21 at the tip
Is provided. The fixed contact member 21 has a cylindrical shape. Further, an upper support rod 22 is provided on the side surface of the main body frame 1 so as to be positioned above the guide roll 9A so as to project in parallel with the guide roll 9A, and a piece 23A of a hinge 23 is attached to a tip of the upper support rod 22. It is fixed, and an insulating mounting seat 24 is provided on the lower surface of the other piece 23B, and a large number of conductive fibers 25A are provided on the mounting seat 24.
A brush 25 serving as a movable contact member, which is collected by a conductive pattern 25B, is provided via a mounting member 25C corresponding to the fixed contact member 21. The fixed contact member 21 and the brush 25 serving as a movable contact member constitute film non-state detection switch means H. The switch means H is connected to an automatic stop relay circuit of the packaging machine by a code (not shown). When the switch means H is closed, the relay is energized and the packaging machine is automatically stopped.

In the state with the film, the stretch film 7 pulled out from the roll body 8 and guided by the guide roll 9A is a pair of upper and lower endless belts of the film supply device C as shown in FIGS. 9 is transported to the position of the wrapping unit 2 and is perforated by the film cutting device D, is wrapped on the wrapped material 3 by the film folding device E, and is wrapped with the film 3A. Is carried out by the carry-out device F. In such a state, as shown in FIG. 2, the brush 25 moves downward by its own weight with the pivot portion of the hinge 23 as a fulcrum, and is in contact with the upper surface of the stretch film 7, whereby the brush 25 is positioned below the stretch film 7. Even if the brush 25 and the fixed contact member 21 come close to each other and the brush 25 and the fixed contact member 21 come close to each other, the film non-state detection switch means H is reliably opened by the interposition of the insulating stretch film 7. Is held. The stretch film 7 is continuously transferred in a state where the conductive fibers 25A of the brush 25 are in contact with each other. However, since the conductive fibers 25A are flexible, there is no fear that the stretch film 7 is damaged.

On the other hand, in a state where the stretch film 7 of the roll body 8 has disappeared, the conductive fiber 25A of the brush 25 is fixedly contacted by its own weight when the end of the stretch film 7 passes through the brush 25 as shown in FIG. Member 21
And the film non-state detection switch means H is securely closed, and the packaging machine automatically stops.

As described above, in the above-described embodiment, when the film is present, the stretch film 7 is interposed between the brush 25 and the fixed contact member 21 to hold the film-non-state detection switch H in the open state. Brush when stretch film 7 passes brush 25 position
Since the switch means H is closed and the packaging machine is automatically stopped when 25 comes into contact with the fixed contact member 21, the absence of the film is accurately detected regardless of the type of film such as the thickness of the stretch film 7. And stable operation becomes possible. Moreover, since the flexible film 25 comes into contact with the stretch film 7, damage to the film can be prevented. Furthermore, when the packaging machine is stopped by detecting the absence of the film, the end of the film is stopped in the vicinity of the guide roll 9A, that is, before the film is fed into the film supply device C.
Since the start of the film is pulled out and connected to the end of the film near the guide roll 9A using the adhesiveness of the film and the packaging machine can be started, the guide plate is connected to the start of the film as in the past and packaging is performed. It is possible to omit the complicated work of sending the information to the section. Further, when connecting the beginning and the end of the film, the brush 25 is moved upward through the hinge 23 as shown by the one-dot chain line in FIG.

The present invention is not limited to the above embodiment, and various modifications can be made within the scope of the present invention. For example, the entire configuration of a packaging machine is applied to various packaging machines that supply a packaging film drawn from a roll body to a packaging unit position to cover an object to be packaged, and carry out the film-covered object. be able to. The movable contact member of the film state detection switch means may be formed of a flexible and conductive material. For example, as shown in FIG. 7, a movable contact piece made of a flexible conductive rubber or conductive plastic is provided on a vertical guide cylinder 26. 27 may be provided so as to be vertically movable. Further, the film absence detection switch means may be provided at an arbitrary position between the roll body and the film supply device.

[Effect of the invention]

The present invention relates to a roll body, a film supply device for supplying a packaging film drawn from the roll body to a packaging unit position, a packaged object supply device for supplying a packaged object to the packaging unit position, and the packaging unit. A film wrapping device that wraps the wrapped object at the position with the wrapping film, and a wrapping machine including an unloading device that unloads the wrapped wrapped object, wherein the roll body and the film supply device A conductive fixed contact member disposed in the lower part of the packaging film in the middle of the film path between the conductive film and a flexible member movably provided vertically above the packaging film corresponding to the fixed contact member; In the state with a film, the movable contact member contacts the upper surface of the film and is opened, and in the state without the film, the movable contact member contacts the fixed contact member. Are those provided with the closing to a film-free state detecting switch means film-free condition to provide a packaging machine which can accurately detect.

[Brief description of the drawings]

1 to 6 show an embodiment of the present invention, FIG. 1 is a perspective view showing a film state detection switch means, and FIGS. 2 and 3 show the operation of the film state detection switch means. FIG. 4 is an overall sectional view of the packaging machine, FIG. 5 is an overall plan view of the packaging machine, and FIGS. 6 (A), (B), (C), and (D).
FIG. 7 is a schematic explanatory view showing a packaging order, and FIG. 7 is a sectional view showing another embodiment of the film absence detecting switch means. 2 ... Packing part 3 ... Packed object 7 ... Stretch film (packaging film) 8 ... Roll body 21 ... Fixed contact member 25 ... Brush (movable contact member) 27 ... Movable contact piece (movable contact member) A ... Packed object Supply device C: Film supply device D: Film cutting device E: Film folding device (film covering device) F: Unloading device H: Film state detection switch means

Claims (1)

(57) [Scope of request for utility model registration] 1. A roll body, a film supply device for supplying a packaging film drawn from the roll body to a packaging portion position, a packaged material supply device for supplying a packaged material to the packaging portion position, In a packaging machine having a film covering device for wrapping the packaged object with the packaging film at a packaging portion position and a carry-out device for carrying out the packaged material, the roll body and the film supply device are provided. And a conductive fixed contact member disposed in the lower part of the packaging film in the middle of the film path between the first and second packaging films; and a vertically movable member provided above the packaging film corresponding to the fixed contact member. A flexible and conductive movable contact member, wherein the movable contact member contacts the upper surface of the film when the film is present, and opens when the film is not in contact with the fixed contact member. Packaging machine, characterized by comprising a film-free state detecting switch means for closing in.