JPH0138116Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to an improvement of an automatic packaging device that places a packaging film roll on two rollers, unwinds the film, and then wraps the film. This invention relates to automatic packaging equipment.

Until now, packaging using plastic film has been widely adopted due to its simplicity, and manual packaging equipment became popular first due to its small size and flexibility, but in recent years various automatic packaging equipment has been developed with the aim of saving labor. . In addition, packaging films have changed from transparent or plain to printed films, abbreviated as print wraps. Rolls of such printed film are usually wound with the printed image on the outside, and the more the number of turns, the more the printed area is raised than the non-printed area, so the roll forms a non-uniform diameter.

When such a printed film roll is placed in an automatic packaging machine, various problems arise even though conventional unprinted film rolls do not have any problems. For example, characters or patterns on printed film may be wrapped inside out, or
In connection with the packaging speed being increased as much as possible,
Because of the high unwinding speed, the ridges on the printing section can damage the film or print, or have a negative effect on the ability to pull the film out of the roll, so there are many devices that cannot be used with printed film rolls without some kind of improvement.

In particular, the present invention relates to a packaging device that automatically packages articles by placing a film roll on two rollers consisting of a drive roller and a free roller and unwinding the film from the film roll, which can be freely attached to and removed from the paper tube of the film roll. A film roll is supported by two pillars fixed to the main body of the packaging apparatus at both ends of the shaft, each of which has a rotating ring that can be fitted into the shaft, and a driving roller is installed below the shaft with a space between the film roll and the film roll. A pair of dancer rolls are arranged between the drive rollers, which are biased toward each other by the tension of the film drawn out by the drive rollers, but which move away from each other when the tension is relaxed. The gist of the automatic packaging device is such that a brake belt, which is wound around both dancer rolls and the shaft portion of the film roll, is strongly tensioned to stop the rotation of the film roll.

Hereinafter, the improvement device of the present invention will be specifically explained with reference to the accompanying drawings.

FIG. 1 is a perspective view of an example of a main part including an improved member of a pillow-type automatic packaging device according to the present invention.

In the figure, two rollers 2 and 3 for placing film rolls are horizontally attached to side plates 1 and 1 of the automatic packaging device. In a conventional pillow-type automatic packaging device, the film roll 4 is
The film 4' is placed over the drive roller 2 and the free roller 3, and the film 4' is attached to the drive roller 2, which rotates in the direction opposite to the arrow shown in the figure.
, the outer surface of the film on the roll is connected to the drive roller 2.
It is released into a state that embraces the surface of the body. but,
In the present invention, pillars 5 are firmly attached and fixed to the outside of the side plates 1 and 1 of the main body of the apparatus, respectively, so that the inner surface of the film 4' comes into contact with a drive roller rotating in the direction of the arrow and is unwound. , 5, the drive roller 2 and the free roller 3 are mounted on a shaft 7 whose both ends are supported by the tops 6, 6 of the
are held at a distance above the A removable rotary ring 8 that can be fitted into the paper tube of the film roll 4 is attached to the shaft 7. A cylindrical brake belt member 10 that is integrally attached to the inside of the ring 8 is attached to the shaft 7. , for example, by using ball bearings, etc., to minimize rotational frictional resistance. On the other hand, both ends of the shaft 7 are suspended and supported in, for example, notched grooves formed at the upper end of each support column, but it is preferable to prevent the shaft from rattling or rotating within the groove. The cross-sectional shapes of the cut groove and both ends of the shaft can be appropriately selected and designed in connection with the installation and removal of the shaft.

According to the improved apparatus of the present invention equipped in this manner, various inconveniences that cannot be avoided when automatically packaging a printed film roll by placing it on a pair of placing rollers can be overcome all at once and effectively.

Although the device of the present invention has the above-mentioned excellent effects, for example, in the case of a pillow-type automatic packaging machine, the printing film roll is unrolled at a considerable speed, that is, the roll is rotated at a considerably high rotational speed. If the operation is stopped or the drive roller is stopped for some reason, the problem arises that the film roll 4 does not stop simultaneously with the stopping operation of the apparatus due to its rotational inertia. This inconvenience is not so much of a problem if the speed at which the film is pulled out from the roll 4 is slow, but the faster it is, the more serious the problem becomes. It is requested that it be stopped.

This film roll rotation stop mechanism can be effectively implemented by sensing the stoppage of the device at an appropriate point and transmitting this to a means for stopping a rotating ring attached to the rotating roll or shaft. However, for example, if two dancer rollers 9, 9 are arranged below the film roll 4,
Separately, a cylindrical brake belt setting member 10 is firmly and integrally attached to a rotary ring 8 on the shaft 7, and two dancer rollers 9, 9 and the member 10 are connected to each other.
A brake mechanism in which an endless closed brake belt 11 is looped around is practical.
The length and material of the belt 11 are appropriately selected, and unless an external force that causes the dancer rollers to approach each other acts, both dancer rollers 9, 9 are biased by a spring within the dancer roller holding members 12, 12. As a result, the belt is strongly tensioned, a strong braking force is applied to the brake belt setting member 10, and the rotating ring 8, that is, the film roll 4 is set so that its rotation stops in a short time. During automatic wrapping operation, one of the dancer rollers 9 is pushed inward by the unwound film 4', so the belt 11 is slack.
Rotation of the film roll 4 by the drive roller 2 is ensured.

The device of the present invention is extremely desirable in practice, since it does not impair the original use of the device and can be easily switched to apply printed wrap rolls to automatic packaging without any inconvenience.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of one example of essential parts of an automatic packaging device according to the present invention. Codes in the diagram: 1...Device main body side plate, 2...Driving roller, 3...Free roller, 4...Film roll, 5...Strut, 7...Shaft, 8...Rotating ring, 9...Dancer Roller, 11...brake belt.

Claims (1)

[Scope of utility model registration request] In an automatic packaging device that pulls out a film from a film roll and wraps an article, both ends of a shaft are fixed to the main body of the packaging device, and both ends of the shaft are equipped with rotary rings that can be detachably fitted into the paper tube of the film roll. A film roll is supported by two pillars, and a drive roller is installed below the support at a distance. A pair of dancer rolls that approach each other but move away from each other when the tension is relaxed are arranged, and when the tension is relaxed, the brake belt that is wound around both dancer rolls and the shaft portion of the film roll is tightened. An automatic packaging device configured to prevent the rotation of a film roll.