JP3613632B2 - Opening mechanism for flat tubular film - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a mechanism for opening a flat tubular film.
[0002]
[Prior art]
A flat tubular film (stretch label) made of self-shrinking polyethylene is used as a label for containers such as PET bottles. This flat cylindrical film is wound long in a roll shape, cut to a certain size, and attached to a container.
[0003]
[Problems to be solved by the invention]
As shown in FIGS. 3 and 4, the cut flat cylindrical film 1 is pulled into both sides by an opener “a” using a vacuum to form a cylindrical shape, and is then covered with a container. At this time, if the cut portion 11 of the flat tubular film 1 is opened from the beginning, it becomes a tubular shape without any problem. However, as shown in FIG. 5, the cut portion 11 is generated when ink is applied to the inner surface of the film or at the time of cutting. In the case of sticking due to heat generated by the conventional opener a, it has been difficult to reliably form a cylinder. For this reason, there is a risk of hindering the production line.
[0004]
OBJECT OF THE INVENTION
The present invention has been made to solve the above-described problems, and provides a flat tubular film opening mechanism capable of reliably opening the cut portion to which the flat tubular film is attached. With the goal.
[0005]
[Means for Solving the Problems]
As a means for solving the above-mentioned problems, the present invention provides a mechanism for opening a cut portion of a flat tubular film after being cut as claimed in claim 1, wherein the flat tubular film is rotated and conveyed while being held on the peripheral surface. a drum, disposed around the drum, becomes more and abutment member to cause displacement on the front and back surfaces of the contact with a flat tubular film to the surface of the flat tubular film which is held in the drum, said abutment The flat contact film is configured so that the front end contact portion of the member is in contact with the surface of the flat cylindrical film held on the peripheral surface of the rotating drum to release and open the cut portion of the flat cylindrical film. A tubular film opening mechanism is provided.
[0006]
According to a second aspect of the present invention, there is provided the flat tubular film opening mechanism according to the first aspect, wherein the front end contact portion of the contact member is bent. To do.
[0007]
As claim 3, in an open system of flat tubular film according to the claim 1 or claim 2, characterized in that the formation of the contact member with a spring steel sheet, provides a release mechanism for a flat tubular film .
[0008]
As claim 4, in an open system of flat tubular film according to any one of the claims 1 to 3, the contact member is movably configured with respect to the drum circumference, the rotation of the flat tubular film Provided is a flat tubular film opening mechanism, wherein the contact member moves forward after the leading end portion in the direction passes through the tip contact portion of the contact member, and contacts the flat tubular film. .
[0009]
DETAILED DESCRIPTION OF THE INVENTION
<A> Drum As shown in FIGS. 1 and 2, the drum 2 is configured to rotate in a state in which the flat cylindrical film 1 after being cut is held on the peripheral surface 21. In the present embodiment, a transport drum is used in the middle of transporting the cut flat tubular film 1 to an air piece of a main rotary (not shown).
[0010]
In order to hold the flat tubular film 1 on the drum peripheral surface 21, a known film feed belt 3 is used. This film feed belt 3 is composed of, for example, a total of four thin belts in two stages, upper and lower, and sandwiching the front and back surfaces of the flat cylindrical film 1. The film-like film 1 is held as if attached to the drum peripheral surface 21. Note that other known holding methods such as a method of holding the flat tubular film 1 on the drum peripheral surface 21 by a negative pressure mechanism can also be adopted.
[0011]
<B> The abutting member abutting member 4 is formed by bending the front end of a belt-shaped spring steel plate to form a front end abutting portion 41. Two drums are arranged around the drum 2 so as to be in contact with each other. The convex curved surface side of the tip contact portion 41 is configured to contact the surface of the flat tubular film 1 held on the peripheral surface 21 of the rotating drum 2.
[0012]
When the tip contact portion 41 abuts on the surface of the flat tubular film 1, a slack 12 is formed so that the surface side of the flat tubular film 1 is scraped off, and the front and back surfaces of the flat tubular film 1 are displaced, The stuck cut portion 11 can be peeled open.
[0013]
The contact member 4 may be made of other materials such as plastic and rubber other than the spring steel material. Further, the reason why the tip contact portion 41 is bent is to prevent the surface of the flat tubular film 1 from being scratched.
[0014]
In addition to providing the abutting member 4 in two upper and lower stages, it is conceivable to arrange one piece having a large width, or to arrange three or more stages in the vertical direction. Moreover, although this Embodiment is a case where the contact member 4 is arrange | positioned one place around the drum 2, it may arrange | position to two or more places.
[0015]
Furthermore, as long as the contact member has a structure capable of contacting the surface of the flat tubular film 1, other structures can be employed. For example, it is also conceivable to open the cut portion 11 by momentarily shifting the rotational speed of the front and back film feed belts 3 using the film feed belt 3 in contact with the front and back surfaces of the flat tubular film 1 as a contact member.
[0016]
<C> Advance / Retreat Mechanism By providing the advance / retreat mechanism 5, the contact member 4 is configured to be able to advance / retreat with respect to the drum circumferential surface 21. For example, a swing arm 51 is connected to the rear end side of the abutting member 4 in a right angle direction, and the swing arm 51 is configured to swing around a rotation shaft 52. One end of the connecting rod 53 is pivotally supported in the middle of the swing arm 51, and the other end is connected to the eccentric shaft 54. The eccentric shaft 54 has a crank structure and is housed in the contact adjusting portion 55 so as to be swingable. In the contact adjusting portion 55, the contact degree of the contact member 4 with the flat tubular film 1 can be adjusted by adjusting the contact degree of the adjusting screw 56 with the eccentric shaft 54.
[0017]
As a result, the swing of the eccentric shaft 54 is transmitted to the contact member 4 via the connecting rod 53 and the swing arm 51, and the contact member 4 can be configured to advance and retract with respect to the drum peripheral surface 21. Then, as shown in FIG. 2, the distal end portion 13 in the rotation direction of the flat tubular film 1 held and sent by the drum peripheral surface 21 passes through the distal end contact portion 41 of the contact member 4. After that, the abutting member 4 is advanced to synchronize the mechanisms so as to abut against the flat tubular film 1. Thereby, it is possible to prevent the flat tubular film 1 from being scraped off from the drum peripheral surface 21 or from being displaced. In some cases, the abutting member 4 may be configured to be fixed without providing the advance / retreat mechanism 5.
[0018]
【The invention's effect】
By bringing the abutting member into contact with the flat cylindrical film held on the rotating drum peripheral surface, the cut portion to which the flat cylindrical film is adhered can be reliably opened. Therefore, it can be easily opened in a cylindrical shape by an opener or the like thereafter. Therefore, it is possible to eliminate the risk of causing trouble in the conventional production line.
[Brief description of the drawings]
1 is an enlarged explanatory view of the main part of the apparatus of the present invention. FIG. 2 is an explanatory view of the entire apparatus of the present invention. FIG. 3 is an explanatory view of the prior art. FIG. 4 is an explanatory view of the prior art. Illustration of

Claims (4)

In the mechanism that opens the cut portion of the flat tubular film after cutting,
A drum that rotates and conveys the flat cylindrical film held on the peripheral surface;
It is arranged around the drum, and comprises a contact member that abuts on the surface of the flat tubular film held on the drum and causes the front and back surfaces of the flat tubular film to shift ,
The front end abutting portion of the abutting member is configured to abut on the surface of the flat cylindrical film held on the peripheral surface of the rotating drum so as to peel and open the cut portion of the flat cylindrical film. To
Opening mechanism for flat tubular film. 2. The flat tubular film opening mechanism according to claim 1, wherein a tip contact portion of the contact member is bent and formed. The flat tubular film opening mechanism according to claim 1 or 2, wherein the contact member is formed of a spring steel plate. The flat tubular film opening mechanism according to any one of claims 1 to 3, wherein the abutting member is configured to be movable forward and backward with respect to the drum peripheral surface, and the front end portion of the flat tubular film in the rotating direction is abutted. An opening mechanism for a flat tubular film, wherein the contact member moves forward after passing through the tip contact portion of the contact member and contacts the flat tubular film.

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