JP2003081210A5 - - Google Patents

Description

[0009]
[Means for Solving the Problems]
In order to solve the problems mentioned above and to achieve the desired purpose suitably, the film holding device in a stretch wrapping machine according to the present invention is:
In a stretch wrapping machine which lifts an article toward a stretch film held above to cover the top surface of the article and folds the film end extending from the periphery of the article to the bottom side of the article,
A pair of endless belt conveyors which sandwich the side edges of the stretch film and convey the article to the upper side;
The facing inwardly to each set of two endless conveyor belts vignetting, and a holding means for holding releasably holding the stretch film that is transported over the article by both said endless belt conveyor,
When the stretch film is lifted by an article, it is characterized in that the film is set to be held only by the holding means.

[0014]
(About release means)
At a position close to each pulley arrangement position in the transport frame 16, release means 30 for releasing the sandwiching of the stretch film F by the upper and lower endless round belts 19 and 21 is respectively disposed. As shown in FIGS. 4 and 5, each release means 30 includes a swing lever 32 pivotally supported by a support shaft 31 disposed on the transfer frame 16, and the tip of the lever 32 lifting roller 33 facing the lower side of the lower straight running portion in each of the upper endless round belt 21 is disposed rotatably. Further, the actuating lever 34 is integrally and movably disposed on the oscillating lever 32, and the upward rod 35a of the releasing solenoid 35 disposed on the transfer frame 16 is provided on the actuating lever 34. It is connected. A leaf spring 36 is resiliently disposed between the actuating lever 34 and the transport frame 16, and the push-up roller 33 is always from the lower linear traveling portion of the upper endless round belt 21 via the rocking lever 32. It is set to be held at the retracted position where it is separated downward. Then, by exciting the release solenoid 35 to attract the magnetic force of the rod 35a, the swing lever 32 swings so as to move the push-up roller 33 against the elastic force of the plate spring 36, and the push-up roller The upper portion 33 moves upward to a release position above the lower linear travel portion of the upper endless round belt 21, whereby the lower linear travel portion of each upper endless round belt 21 is moved to the lower endless round belt 19 by the push-up roller 33. Of the stretch film F is released (see FIG. 7).

[0045]
【Effect of the invention】
As described above, according to the film holding device in the stretch wrapping machine according to claim 1 of the present invention, when the stretch film is lifted by the article, the film is provided only by the holding means provided separately from the endless belt conveyor. Since the present invention is configured to directly hold the stretch film, unlike the prior art, since the stretch film is not held with the belt, the adhesion of the film to the belt is reduced. Therefore, the release of the holding to the stretch film is good, and the tearing of the film and the breakage of the article can be suppressed .

[0046]
According to the film holding device of the second aspect , since the stretch film can be pre-stretched by the pre-stretching means, the stretch film is untwisted and a good packaging state can be obtained. Further, according to the film holding device of the third aspect , since the film tension can be reduced by the tension reducing means, the article is not broken at the time of packaging, and the occurrence of defective packaging is reduced. In particular, it is effective for weak articles and tall articles.

[0047]
According to the film holding device relating to the fourth aspect , the holding means is divided to hold the stretch film at a plurality of places in the film transport direction, so that the corresponding place The timing for releasing the film holding by the holding means can be set, and a beautiful and well-wrapped condition can be obtained. Further, according to the film holding device of the fifth aspect , since it is possible to individually set release timings of the film holding by the divided holding means, it is possible to cope with articles of various sizes.

Claims (5)

The article (29) is lifted toward the stretch film (F) held above to cover the top surface of the article (29), and the film end extending from the periphery of the article (29) is the bottom of the article (29) In the stretch wrapping machine that folds into the side,
A pair of endless belt conveyors (22, 22) sandwiching the side edge of the stretch film (F) and conveying it above the article (29);
Holding said respective set in opposite direction inside the two endless conveyor belts (22, 22) vignetting, the stretch film that is transported over the article (29) by both said endless belt conveyor (22, 22) to (F) Holding means (41, 42, 43) for releasably holding,
When the stretch film (F) is lifted by an article (29), it is set to hold the film (F) only by the holding means (41, 42, 43). Film holding device in the machine. Pre-stretching means (58, 59, 60, 61, 62, 63, 64, 65) for increasing the distance between the pair of holding means (41, 42, 43) in the holding state with respect to the stretch film (F). film holding device in claim 1 Symbol placement stretch wrapping machine has a. Tension reducing means (58, 59, 60, 61, 62, 63, 64, 65) for narrowing the distance between opposing directions of the pair of holding means (41, 42, 43) in the holding state with respect to the stretch film (F) The film holding device in a stretch wrapping machine according to claim 1 or 2, comprising: The holding means (41, 42, 43) is formed in a shape along the film conveying direction of the endless belt conveyor (22, 22), and configured to hold and hold the stretch film (F), which film 4. The apparatus according to any one of claims 1 to 3 , wherein the center of the transport direction is arranged to correspond to the center of the film transport direction of the articles (29) to be lifted and the holding means (42, 43) are divided in the film transport direction. A film holding device in a stretch wrapping machine according to any one of the preceding claims. The film holding device in a stretch wrapping machine according to claim 4 , wherein the holding release timing of each holding means (42, 43) divided in the film conveyance direction is settable individually.