JPH0110334Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a packaging film cutting device which is used to pull out a long strip-shaped film from a film cylinder, wrap the film around foods, etc., and then cut the film.

A device for wrapping food products with plastic film is a widely known device, as seen in Japanese Utility Model Application Publication No. 49-75187, etc. The plastic transparent film used here is also called stretch film, and has a high tensile strength. On the other hand, packaging is highly extensible and has self-adhesive properties that create pseudo-adhesion between films or between films and smooth surfaces such as metal or ceramics, making them adhere to each other just by pressing. It has very favorable characteristics.

However, in the conventional packaging device shown in Japanese Utility Model Application No. 49-75187 that uses such a stretch film, when the film is rapidly pulled out, the film is damaged due to the static inertia of the film cylinder. As soon as the film is stretched and wrapped around food, etc. and cut by a cutting device, the leading end of the film drawn out from the film cylinder is released from the tensile force, so the main case shrinks and houses the film cylinder inside. This will make it difficult to pull out the film next time. These inconveniences become more serious as the speed at which the film is pulled out is increased in an attempt to quickly carry out the packaging operation.

An object of the present invention is to eliminate this drawback and provide a packaging film cutting device that can prevent the leading end of the film immediately after being cut by the cutting device from being pulled back into the main body due to the shrinking action. .

The present invention includes a main body that retractably stores a long film made of self-adhesive plastic film, has an outlet for pulling the film outward, and a cutting device that cuts the film pulled out from the outlet. In order to maintain the cut end of the film in a bridge state between the cutting device and the outlet port, there are flat portions for adhering the film, which are spaced apart from each other in the front and back direction, and are always supported by a spring or the like. A rotating member to which a restoring force is applied, and a film contact receiving member provided on a rising surface adjacent to the flat portion located on the outlet side of the rotating member and on which a film pulled out forward slides. The cutting blade portion of the cutting device is set at a higher position than the flat portion located on the cutting device side, and the film pulled out from the outlet is cut by the cutting device and then cut by the cutting device. The flat portions are in close contact with each other in a bridging state, thus preventing the inconvenience of the film being rapidly pulled out, elongated, and then contracted after being cut so that the leading end of the film is pulled back into the main body.

An embodiment of the present invention will be described below with reference to the drawings. 1 is a main body, and a power distribution box 2 is arranged and fixed in the front part of the main body. Reference numeral 3 denotes a film cylinder disposed within the main body 1, which is made by winding a long strip-shaped film 4 into a cylindrical shape, and is rotatable on a pair of rollers 5, 5 pivotally provided at the rear of the lower part of the main body 1. It is listed on. The film cylinder 3 is in close contact with the rollers 5, 5,
When the strip film 4 is pulled out, it rotates on its own axis and rotates the rollers 5, 5. Reference numeral 6 denotes a cover plate pivotally mounted on the top of the main body 1 so as to be able to rotate to open and close.
An outlet 7 for drawing out the strip film 4 outward is formed between the two. Reference numerals 8 and 8 denote supporting pieces extending integrally on both left and right sides of the rear upper part of the power distribution box 2, and two rollers 9 and 1 are installed between these supporting pieces 8, 8.
0 is pivoted so that it can rotate up and down. 11,11
are pillars erected on both left and right sides of the front upper part of the power distribution box 2. Terminals 12, 12 are fixed to these pillars 11, 11, respectively, and a heat transfer wire 13 as a cutting device is stretched between the terminals 12, 12. are doing. 14 is power distribution box 2
This is a rotating member made of sheet metal that is pivotally mounted on the upper part of the main body 1 so as to be rotatable in the front-rear direction via a shaft 14a, and is located between the outlet 7 of the main body 1 and the heating wire 13 which is the cutting device. . Reference numerals 15 and 16 denote first and second holding members which are bent to stand up on both the front and back sides of the rotating member 14, and are opposed to each other at a predetermined distance in the drawing direction of the strip film 4, that is, in the front and back direction. Flat portions 15a and 16a are integrally formed at the upper portions of the holding members 15 and 16, respectively. 17
is a molded cloth member as a film contact receiving member, which is attached to the outlet port 7 side of the rotating member 14, for example, to the outer surface of the first holding member 15. Reference numeral 18 denotes a torsion coil spring that always urges the rotating member 14 to rotate in the direction of arrow A, that is, in the direction of the outlet port 7. The rotating member 14 always holds the holding member 15 against the cloth member 17 by the spring force of this torsion coil spring 18. It is brought into pressure contact with the roller 9 via. Reference numeral 19 denotes a stopper that determines the rotation limit position of the rotating member 14 in the opposite direction of arrow A, and this causes the rotating member 14 to move to the second
It is possible to reciprocate between the two rotation limit positions shown by the solid line and the two-dot chain line in the figure. Reference numeral 20 denotes a cradle rotatably supported on the front part of the main body 1 via a pivot 21, and an electric heating plate 22 having an electric heater (not shown) is provided on the upper part of the cradle 20. is supported in a substantially horizontal state when in use, and rotated and stored in the main body 1 as shown by the two-dot chain line in FIG. 1 when not in use. In the above configuration, the heating wire 13 corresponding to the blade portion of the cutting device is set at a higher position than the flat portion 16a on the heating wire 13 side. still,
Reference numeral 23 denotes a switch device that turns on and off the heating wire 13 and the electric heater of the heating panel 22 disposed in the power distribution box 2.

Next, the operation of the above configuration will be described. First, the winding end of the band-shaped film 4 is placed over the roller 10, and is inserted between the roller 9 and the first holding member 15 to be led out from the outlet 7. In addition, the switch device 23 is turned on to connect the heating wire 13 and the heating panel 2.
Heat 2. Now, regarding packaging work,
Pinch the winding end portion of the strip film 4, that is, the outlet end, and pull the strip film 4 upward to open the outlet 7.
Pull it out to a specified length. Then, as is conventional practice, wrap the food or other packaged object with the pull-out film, and pull the entire packaged object from above to the front and downwards, and press the strip film 4 against the heating wire 13 to thermally melt it. . Thereafter, the peripheral edge of the film extending from the object to be packaged is folded into the lower surface of the object to be packaged, and this portion is placed on the electric heating plate 22 to be welded together.

Now, in the process of moving the pull-out operation direction of the film strip 4 upward and then downward, that is, in the direction of the heating wire 13, as described above, the film strip 4
is first pressed against only the cloth member 17 and pulled out, and then moved to the flat portion 15a of the first holding member 15.
At this point, the entire rotating member 14 is rotated in the opposite direction of arrow A, and finally comes into contact with the heating wire 13 and is cut. The cut end 4a of the lead-out end portion of the belt-shaped film 4 has a rotating member 14 torsioned by the coil spring 1.
8, it is separated from the heating wire 13 by being rotated back in the direction of arrow A, and is received on the flat part 16a of the second holding member 16, where it is held in close contact by self-adhesive action. .

By the way, when packaging work is carried out at a supermarket or store where quick work is required, the strip-shaped film 4 is rapidly pulled from the outlet 7 due to the need for quick work, and therefore is significantly elongated due to the static inertia of the film cylinder 3. Then, since it shrinks immediately after being cut by the heating wire 13, the lead-out end portion of the strip film 4 tends to be pulled back into the main body 1 from the lead-out port 7. If it is completely pulled back into the main body, it will be difficult to pull out the strip film 4 during the next packaging, which will worsen the packaging work efficiency. However, in this invention, the leading end portion of the strip film 4 is tightly attached to the flat portions 15a, 16a of the first and second holding members 15, 16 provided on the rotating member 14 by self-adhesion after cutting. This prevents the film from being pulled back into the main body 1 due to shrinkage caused by elongation of the film.

Further, the flat portions 15a and 16a may have a form in which the smooth surfaces to which the film adheres by self-adhesion have a significant area, and therefore, there is no problem even if the flat portions 15a and 16a are slightly rounded.

As is clear from the above explanation, conventionally the cut end of the film is separated from the heating wire for cutting, or a switch is activated to supply power to the heating wire (Utility Model Application Publication No. 49-75187 is also an example of this). A rotating member is placed between the film outlet and the heating wire for cutting, but in either case, this rotating member needs to slide against the film (self-adhesion may cause the film to slip). In contrast, the present invention has a holding member having a flat part to which the film self-adheses to such a rotating member, and a film contact receiving member on which the film such as a cloth member can freely run. This film has an unprecedented feature in that the film can be brought into close contact with the flat portion by changing the drawing direction of the film, and the excellent effects described above can be obtained.

As described above, the present invention prevents the leading end of the film from being pulled back into the main body after the cutting operation even if the strip-shaped film is pulled out rapidly. It is possible to provide a film cutting device for.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, with FIG. 1 being a partially cutaway side view of the entire device, and FIG. 2 being an enlarged vertical sectional view of the main part. In the drawings, 1 is a main body, 3 is a film cylinder, 4 is a belt-shaped film, 7 is an outlet, 13 is a heating wire (cutting device), 14 is a rotating member, 15 and 16 are first and second holding members, 15a and 16a are flat parts, 1
7 is a cloth member (film contact receiving member), and 22 is an electric heating board.

Claims (1)

[Scope of utility model registration request] A main body that releasably stores a long film made of self-adhesive plastic film and has an outlet for drawing the film outward;
a cutting device for cutting the film pulled out from the outlet; and a cutting device positioned at a distance from each other in the front-rear direction in order to maintain the cut end of the film in a bridging state between the cutting device and the outlet. A rotary member having a flat part for film adhesion and to which a restoring force is always applied by a spring or the like; A packaging film cutting device comprising: a film contact receiving member on which a film that is drawn out slides; and a cutting blade portion of the cutting device is set at a higher position than the flat portion located on the cutting device side. .