JPH0219207A - Mouth opening twofold packing film - Google Patents

Abstract

PURPOSE:To eliminate the damage of a film and to enhance efficiency by providing a mouth opening edge for folding back the side edge parts of the upper and lower piece parts of a mouth opened twofold film in a transfer direction and providing a guide lever between a reversely running belt and a lower mouth opening means. CONSTITUTION:Between a belt 2' reversely running from the transfer forward side of a belt conveyor 2 and a lower mouth opening means 3', guide levers 12 reaching the lower mouth opening means 3' from the reversal position of the belt 2' are provided to prevent the contact of the lower piece part a'' of a film (a), whose mouth is reversely opened by a mouth opening lever 3b', with the belt 2'. The guide levers 12 are arranged in the belt moving direction at an appropriate interval between a guide lever 12' being one support lever in the direction crossing the moving direction of the belt 2' at a right angle and a guide lever 12' being the other support lever provided behind in parallel to the belt 2' by the mouth opening lever 3b' and both ends are integrally provided to the guide levers 12', 12'.

Description

Detailed Description of the Invention (Field of Application in Business A) This invention relates to an improvement in an article packaging device using a semi-folded film, and particularly relates to a belt for transporting an article to be wrapped into a film opened vertically. A half-folded film that allows the lower part of the film that moves in the opposite direction to the conveyor's reversing belt to pass through smoothly without being damaged, thereby maximizing the use of the packaging space for goods. This invention relates to a mouth opening device.

(Prior art) As a means of packaging articles using a folded film made of vinyl chloride, polyethylene, polypropylene, etc., which is usually wound into a roll, the packaged article is positioned in the direction in which the roll is fed out, and the film is opened in a half-open shape. A method of sequentially loading the packaged articles into the film, and a method of providing a feeding path for the packaged articles perpendicular to the direction in which the roll is fed out, and taking the packaged articles in this feeding path into the reversed inside of the fed-out film. There is a method of packaging.

Each of these packaging methods using half-folded film has its advantages and disadvantages, and one of them is often used depending on the characteristics of the product to be packaged.Especially in the automatic packaging of continuous products, the latter film is often used A device that could sequentially feed the articles to be packaged into an open mouth was suitable.

From this point of view, we have developed a device for opening a chive-folded film in an article packaging machine, as proposed in Utility Model Publication No. 1984-20567, and a half-folded film for packaging items using a half-folded film as disclosed in Japanese Patent Application No. 184543-1980. A number of improved packaging units have been disclosed, including multiple units.

(Problem to be Solved by the Invention) However, when opening a half-folded film while inverting it in a direction substantially perpendicular to the feeding direction of the half-folded film, and feeding an article to be packaged into the opened film, this It is necessary to feed the article to be packaged so as to reach the inner depths of the opened half-folded film, and belt conveyors have recently come to be commonly used as a means for this feeding.

The use of this belt conveyor is disclosed in US Pat. No. 4,219,988.
Although it is possible to simplify the complicated equipment shown in the specification and drawings and to make handling operations easier, it is possible to change the transport direction of the lower part of the opened and fed film and the belt of the belt conveyor. The direction of movement is opposite to that of the conveyor belt, and the film has the disadvantage of being held back by the belt of the belt conveyor, or being torn or abraded.

In particular, the film used for packaging is P-P.

In the case of P-E, etc., the film itself is sticky, causing a waving phenomenon when pulled out from the roll and peeling off the top and bottom pieces, and the packaged item has moisture. In this case, the conveyor belt will sag below the intended tension position, resulting in a unique waving phenomenon in the belt.

In order to avoid contact between the lower part of the film and the belt, which occurs due to the occurrence of such a waving phenomenon in the film and belt, it is necessary to provide a sufficient distance between the two.

This necessity also arises from the packaging work environment, and is particularly essential when packaging work is carried out under conditions of high temperature and humidity.

Since there is a certain limit to the width of the opening of the film used, the distance between the top surface of the belt conveyor and the top of the opened film is the permissible distance for transporting the packaged items. naturally tended to be narrowed down.

For this reason, unlike the case where the packaged article is thin, when the packaged article has sufficient thickness (height), there is an inconvenience that the packaged article cannot be taken into the opening film.

Therefore, a partition plate is provided between the belt that runs in reverse from the front side of the belt conveyor and the opening means to prevent the belt from coming into contact with the bottom piece of the film. In addition to making it possible to package goods, it also allowed the opened film to be smoothly fed without being damaged by the belt of the conveyor belt. During packaging work, or when the item to be packaged is wet, the film tends to stick to the partition plates, causing problems such as fraying or damage.

The purpose of the half-fold packaging film opening device of the present invention is to solve the above-mentioned problems, eliminate damage to the packaging film, and enable efficient packaging work.

(Means for Solving the Problems) The present invention provides a device for opening a half-folded packaging film, which is provided to achieve the above object, and includes a belt conveyor for transporting an article to be packaged, and a transport direction of the belt conveyor. means for supplying a half-folded film substantially orthogonally to the supply half-folded film; and upper opening means for opening the supplied half-folded film provided above and below the belt conveyor located in front of the supply of the supplied half-folded film. and a lower opening means,
The opening means has an opening edge that folds at least the side edges of the upper and lower pieces of the opened half-folded film at a predetermined angle toward the transport direction of the packaged article. At least six moving directions of the belt are provided between the belt that runs in reverse from the forward side of the belt conveyor and the lower opening means, from the reversal position of the belt to the lower opening means. The structure is such that a guide frame is provided in both or one of the directions orthogonal to the six motion directions.

(Function) The half-folded packaging film opening device configured as described above is designed to prevent the belt from waving and sagging between the belt that is running in reverse on the belt conveyor and the lower part of the film. Even if the film comes into contact with this guide frame, the frictional resistance of the guide frame is small, so that the film is fed smoothly due to the waving phenomenon that occurs when the film is pulled out from the roll or the upper and lower pieces are peeled off. The film will not be damaged or scratched.

(Example) Hereinafter, a typical example of a device for opening a half-folded packaging film according to the present invention will be described with reference to the accompanying drawings.

The film opening device HA usually includes a belt conveyor 2 installed on a machine stand 1, a pair of opening means 3 provided to sandwich the belt conveyor 2 from above and below, and a film opening device 3 that folds the film in half. It consists of a film supply means C that sequentially sends out the film a, and a sealing device B is arranged next to this.

The belt conveyor 2 has a drive roll 4 on the front side of the conveyor.
It has a belt receiving plate 5 on the front side of the conveyance, and a tension roll 6 as appropriate.
The belt receiving plate 5 is provided with its free end curved downward in an arc shape 5a from the vicinity of the drive roll 4 toward the front side of the conveyance of the belt conveyor 2. It is being The configuration in which the belt receiving plate 5 is provided over almost the entire surface of the belt conveyor 2 prevents the degree of tension of the belt of the belt conveyor 2 from changing due to the weight and weight of the articles to be packaged, and also prevents the smooth handling of heavy articles. This is to enable easy transportation.

Next, the film oral listening means 3 is transferred to the belt conveyor 2.
It consists of a pair of triangular frame rings arranged above and below, and this frame ring has an opening provided on the side of the film supplying means C so as to be parallel to the belt conveyor 2. The opening rod 3a, the mounting rod 3c provided orthogonally to the belt conveyor 2, and the opening rod 3a and the installation rod 3C on this day.
For installation, the angle between the rod 3C and the opening rod 3a is usually 90 degrees, and the angle between the opening rods 3a and 3b is typically 90 degrees. The angle is usually 45 degrees, the upper and lower frame rings are of the same shape, and the support frame is mounted on a shaft with a boss 8 so that it can be adjusted vertically.

That is, the opening means 3 described above is inclined from a position in front of the conveyance of the belt conveyor 2 on the side of the film supply means C to a side in front of the conveyance of the belt conveyor 2 on the side opposite to the supply means C. An opening rod 3b is provided so as to open the film a, and this opening rod 3b forms the basic reversal opening of the film a.

A supply means C for film a is provided on the side of the opening means 3, that is, on the side of the opening rod 3a. It is configured so that it can be continuously supplied to the open means 3 via appropriate rolls 11, . . . -11 such as static electricity removal rolls and tension rolls.

Further, between the belt 2° which runs in reverse from the forward side of the belt conveyor 2 and the lower opening device 3°, there is a guide ring 12 which extends from the inverted position of the belt 2° to the lower opening means 3°. is provided to prevent the lower piece a@ of the film a which has been reversely opened by the opening rod 3b' from coming into contact with the belt 2°.

This guide ring 12 has one support frame with a guide ring 12° in a direction orthogonal to the moving direction of the belt 2° slightly in front of the belt 2° inverted position on the forward side of the conveyance side of the belt conveyor 2, and the opening rod 3b' parallel to the belt 2° rearward and,
The guide ring 12° provided at the intermediate position between the height of the belt 2° and the opening rod 3b' is used as the other support frame, and both guide frames 1
They are arranged in the belt movement direction at appropriate intervals at 2° and 12°, and both ends are integrally connected to guide rings 12'' and 12°. Use a prostrate stick made of metal with low risk of rusting such as aluminum or stainless steel, metal coated with Teflon or other coatings, or material with low frictional resistance such as fiber-reinforced plastic. It will be done.

Figure 5 shows guide rings 12 arranged along both sides of the belt 2°.
．． Guide rings 12° extending in a direction perpendicular to the moving direction of the belt 2° are arranged at appropriate intervals between the belt 2° movement direction and from the belt reversal position to the opening rod 3b' position, and both ends are connected to the guide rings 12.12. 12 are integrally connected.

These belt conveyor 2, guide rings 12, 12'', and lower opening means 3'' create a gap between the guide rings 12, 12° and the belt conveyor 2, in which the belt runs 2 degrees, and a lower opening means 3''. By leaving only a small gap between the means 3° and the guide ring 12.12° through which the lower piece a'' of the film reversed by the opening rod 3b' is inserted,
A large article transfer space could be formed between the upper opening means 3 and the upper surface of the belt conveyor 2.

(Effects) The half-folding packaging film opening device according to the present invention has the above-mentioned configuration, so that a large opening space can be created between the upper surface of the belt conveyor on which the packaged articles are transferred and the upper opening means. This allows for effective film packaging when the half-folded film used is at its maximum opening, and also prevents belt sagging caused by transporting items containing moisture, and film that is in close contact with each other due to static electricity adhesion. The guide ring reliably prevents contact between the film and the belt due to undulations caused by peeling off or undulations caused by pulling out from the roll. Due to its low frictional resistance, the film moves smoothly in 8 lines, preventing scratches and scratches on the film.
This effectively avoids the problem of package defects due to tearing, etc.

[Brief explanation of the drawing]

Fig. 1 is a partially sectional front view of an embodiment of the mouth opening device according to the present invention, Fig. 2 is a perspective view of the same, and Fig. 3 is a side view of the main parts of the mouth opening device partially shown in section. , FIG. 4 is a perspective view of the guide ring, and FIG. 5 is a perspective view of another embodiment of the guide ring. 1 axis/11 units, 2--belt conveyor, 3--oral listening means, 5--belt receiving plate, 7--support frame, 10--roll film, 11--support roll, 12-- ...Guide ring, a...film, ao...upper piece, a...
Lower piece part, A... mouth opening device, B... sealing device, C
...Film supply means.

Claims (1)

[Claims] 1. A belt conveyor for transporting articles to be packaged, a means for supplying a half-folded film substantially perpendicular to the transport direction of this belt conveyor, and above and below the belt conveyor located in front of the supply of the supplied half-folded film. and an upper opening means and a lower opening means for opening the supplied half-folded film, and the opening means opens at least the upper and lower pieces of the opened half-folded film. a belt having opening edges whose respective side edges are folded at a predetermined angle toward the transporting direction of the article to be packaged, and a belt that runs in reverse from the transporting front side of the belt conveyor; and the lower opening opening means. A guide rod is provided at least between the belt in the direction of movement of the belt and/or a direction perpendicular to the direction of movement from the inverted position of the belt to the lower opening means. Semi-folding packaging film opening device featuring