JPS6214398B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a notch forming apparatus for a synthetic resin film.

In FIG. 1 showing the process of manufacturing a synthetic resin film bag according to the present invention, a continuous synthetic resin film 10 is folded intermittently in the direction of the arrow, and is bent so that one edge extends longer than the other. A notch 11 is formed near the elongated edge at a predetermined position when the film is fed out and stopped, and at another predetermined position, the film passes through the center of the notch 11 across the direction of travel of the film 10. By fusing and welding both sides to form a welded part 12, a bag 15 having an extension part 14 having sloped parts 13 on both sides is manufactured. The cutout 11 can be formed by pressing the vicinity of the edge of the film 10 placed on a support plate made of synthetic resin or the like with a V-shaped blade, but generally it is difficult to cut and the cutout 11 can be formed repeatedly.
While forming the film, chips from the film may be pressed against the tip of the blade and adhere to the support plate.
Once the chips adhere, the notch 11 cannot be formed at all. Furthermore, in order to form the V-shaped notch 11 near the edge of the conventionally continuous film 10, there has also been a proposal to use a bent heat sealer plate and fuse it as shown in, for example, Japanese Utility Model Application No. 54-123921. However, the equipment for heating and cooling the film is expensive. Therefore, a practical device for easily forming the notch 11 using a blade without heating means has been expected, but none has been available so far.

The present invention solves these problems and provides a practical device that can repeatedly form notches on the edge of a continuous synthetic resin film using a blade without heating means.

Embodiments of the present invention will be described below with reference to the drawings.

In one embodiment of the invention shown in FIGS. 2 to 9, reference numeral 16 denotes a support member which is removably attached to a mounting rod 17 placed at a predetermined position with a pair of screws 18. A support surface section 20 is provided on the upper surface of the support member 16 along which the vicinity of the lower edge of the synthetic resin film 10 is bent so that the lower edge extends longer than the upper side. A narrow V-shaped elongated hole 21 is formed in this support surface portion 20, and an opening 22 consisting of a triangular hole is formed close to this elongated hole with a slight interval therebetween. . The support member 16 has a surrounding surface portion 23 below the support surface portion 20 that surrounds the outside of the space 24 below the elongated hole 21 and the opening 22, and this surrounding surface portion has a flexible blower pipe 25 on one side. There is a connecting air outlet 26 and a discharge hose 27 on the other side.
A discharge port 28 is provided to connect the two.

Reference numeral 30 denotes an elevating member which is repeatedly lowered and raised by a device not shown, and a mounting member 31 is removably mounted using screws 32. Reference numeral 33 is a thin plate having no heating means, and is fixed by inserting one piece into each side of the V-shaped groove 35 formed on the lower surface of the mounting member 31 and tightening the screw 36, and has a sharp lower edge. These are two blade bodies with vine cutting edges 33a. The lower surface of the attachment member 31 to which this blade is attached is inclined so that the corner of the V-shaped groove 35 is directed downward. Therefore, the lower edge of the blade bodies 33 is inclined so that the part where the two blade bodies 33 touch is located downward. That is, when the blade 33 is separated from the support surface 20, the portion of the film 10 that cuts away from the edge of the film 10 is closer to the support surface 20 than the portion that cuts the edge of the film 10. The position of the cutting edge 33a is gradually changed so that the cutting edge 33a is moved. When the elevating member 30 descends, the movement of the film 10 is stopped, and the blade 33 forms a V-shaped notch 11 near the edge of the film 10 while cutting into the long hole 21 of the support surface part 20. It is designed to be inserted into the In this case, in FIG. 9, cutting is first started from a portion away from the edge of the film 10 as shown in a, the cutting progresses as shown in b, and the edge is finally cut as shown in c. Therefore, the tension of the film 10 can be maintained to the end, the part to be cut can be cut without deformation, and the blade 33 can be cut without being deformed.
The film 10 is supported by the support surface portions 20 on both sides of the elongated hole 21 into which the cutout portion 11 is inserted, so that the notch portion 11 is not deformed. 37 shows a cut piece of the film 10.

Reference numeral 38 designates a heating melting rod that is held movably up and down on the mounting member 31, and 39 designating a helical spring that constantly presses the heating melting rod downward. In order to form the notch 11 in the film 10, the heating melting rod 38 contacts the film 10 at the corner of the notch 11 when the blade 33 starts cutting and cuts halfway, and applies a pressing force by compression of the spring 39. The lead wire 4 is heated and melted while applying pressure to form a small melted part 40, and has a sharp tip.
It has a built-in heater (not shown) that is energized from 1. The melted portion 40 is formed to prevent a tear from forming in the film 10 from a corner of the notch 11 when or after the notch 11 is formed.

Reference numeral 42 denotes an air outlet formed in the mounting member 31, which opens between the blade bodies 33 and allows compressed air to be sent through the flexible pipe 43. At the moment when the notch 11 is formed in the film 10, air is blown from above the cut piece 37 through this air outlet, and the cut piece is sent into the space 24 through the opening 22 of the support member 16. When the cut pieces 37 are sent into the space 24, air is blown from the pipe 25 and the cut pieces 37 are discharged through the hose 27. The delivery of compressed air is controlled by solenoid valves (not shown) in the pipes 25 and 43. Even after the notch 11 is formed on the edge of the film 10, the attachment member 31 descends slightly and then rises together with the elevating member 30 to return to its initial state. The film 10 is configured to move by a predetermined length in the direction of the arrow in FIG. 2 when the mounting member 31 is raised above a predetermined value.

Elongated hole 2 formed in the support surface portion 20 of the support member 16
1 is formed in a gap that is at least slightly larger than the thickness of the blade body 33, but the synthetic resin film 10
If the notch 11 is extremely thin, small irregularities will be formed on both sides of the notch 11 unless the elongated hole 21 has a narrower gap. Therefore, as shown in FIGS. 10 and 11, the silicone rubber plate 4 has a hole 47 in the upper surface of the support surface section 20 that communicates with the opening 22.
Attach 6 on top of each other with adhesive or screws, etc.
Further, the blade body 33 may be lowered to form a V-shaped cutting portion 48, and the film 10 may be supported on the V-shaped cutting portion 48 to form the notch portion 11. The gap between the cutting part 48 is such that the silicone rubber plate 46 is connected to the cutting edge 33 of the blade body 33.
The rear blade body 33 cut at a is a silicon rubber plate 46
The notch 1 of the film 10 is extremely thin because it passes through the film while expanding against the elasticity of the film 10.
This prevents small irregularities from forming on both sides of 1.

In this invention, a single V-shaped blade shown in FIG. 12 may be used as the blade 33. Further, the opening 22 is not a hole but a notch as shown in FIG. 13, and the support member 16
The surrounding surface portion 23 is formed so that one side is open, and air is blown from the air outlet 42 of the mounting member 31 without providing the air outlet 26 on the support member 16 to remove the cut piece 3.
It can also be configured to blow out 7.
Alternatively, the hose 27 may be connected to a vacuum source without providing the air outlet 26 and the air outlet 42, and the cut piece 37 may be removed by vacuum suction.
That is, it is only necessary to provide a discharge means using an air flow for removing the cut pieces 37. Furthermore,
In this invention, as shown in FIG. 14, a pressure-sensitive adhesive 50 is applied to a synthetic resin film 10 and this part is covered with a paper tape 51, and a notch 11 is formed on the synthetic resin film 10.
It can also be used when paper or the like is superimposed on a part of the synthetic resin film 10 to form a .

Since this invention is configured as described above,
Since the tension can be maintained in the film 10 until the edge portion is cut, the film 10 is cut to form the correct notch 11 without being deformed at the cut portion, and chips are removed from the support surface 20.
There is no problem such as adhesion to the film, and furthermore, when the notch 11 is formed in the film 10 by the heated melting rod 38, the molten part 40 is formed at a central corner of this notch 11, and from this corner. This has the effect that it is possible to prevent the crack from widening and to obtain a practical device that can repeatedly form the notch 11 in the film 10 by using the blade 33 without a heating means.

In this invention, it is possible to use the silicone rubber plate 46 attached to the support surface part 20, and in this case also, chips of the film 10 are generated and the cutting part 46 is used.
8, it is pushed by the blade 33 and discharged through the cutting part 48 and the long hole 21, so it does not interfere with cutting, and even if the film 10 is extremely thin, an accurate notch 11 can be formed. It is something.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing the manufacturing process of a synthetic resin film bag suitable for using the device according to the present invention, Fig. 2 is a front view showing an embodiment of the present invention, and Fig. 3 is a side view thereof. , Fig. 4 is a plan view of the support member, Fig. 5 is a longitudinal sectional view thereof, Fig. 6 is a longitudinal sectional view of the mounting member to which the blade is attached, Fig. 7 is a bottom view thereof, and Fig. 8 is the blade. 9 is an explanatory diagram of the state in which the film is cut, FIG. 10 is a side view showing the silicone rubber plate attached to the support member, FIG. 11 is a plan view thereof, and FIGS. 13 is a perspective view showing a support member in another embodiment of the invention, and FIG. 14 is a perspective view showing a blade used in another embodiment of the invention. FIG. 2 is a plan view showing a part of a synthetic resin film to which a paper tape is attached. 10 is a synthetic resin film, 11 is a notch, 1
6 is a support member, 20 is a support surface portion, 21 is a long hole, 2
2 is an opening, 26 is a ventilation port, 28 is a discharge port, 31
3 is a mounting member, 33 is a blade body, 37 is a cutting piece, and 42 is an air outlet.

Claims (1)

[Claims] 1. A notch forming device for a synthetic resin film that sequentially forms V-shaped notches near the edge of a continuous synthetic resin film, which allows the vicinity of the edge of the film to pass along the surface. A supporting member having a supporting surface portion having the above structure, a narrow V-shaped elongated hole formed in the part of the supporting surface portion where the film is cut, and an opening formed between the elongated holes in proximity to the elongated hole. The film is attached to the mounting member, moves toward the support surface, starts cutting from the V-shaped corner of the film, and finally cuts the edge, and the cutting edge starts from the cut part. A thin blade body arranged in a V-shape returns to the initial position after being inserted into the elongated hole, and is held by a mounting member so that it can move forward and backward by receiving elasticity from a spring toward the support surface portion. A heating melting rod with a built-in heater that cuts the edge of the notch and then presses this part with a sharp tip to heat and melt the film to form a small melted part; A notch forming apparatus for a synthetic resin film, comprising a discharge means for discharging the cut pieces through the opening by using an air flow after cutting.