JPH10596A - Plastic film cutter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate a trouble of having a worker injured on his/her fingers even when a movable blade is unexpectedly lowered on a plastic film cutter. SOLUTION: A protective bar 6 or a protective plate extending in the cross direction of a plastic film 1 is arranged above a fixed blade 3, the protective bar or the protective plate approaches a movable blade and the fixed blade, a part between the movable blade and the fixed blade is covered with the protective bar 6 or the protective plate, and the plastic film is passed between the protective bar 6 or the protective plate and the fixed blade.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plastic film cutting cutter for cutting a plastic film.

[0002]

2. Description of the Related Art For example, in a bag making machine for producing a plastic bag, a plastic film is intermittently fed by a fixed length, and the plastic film is heat-sealed by a heater for each intermittent feed. afterwards,
Each time the plastic film is intermittently fed, the cutter cuts the plastic film, thereby producing a plastic bag.

[0003] Normally, a cutter comprises a movable blade and a fixed blade.
In the feed path of the plastic film, the fixed blade extends in the width direction of the plastic film and is arranged below the plastic film. The movable blade extends in the width direction of the plastic film, is provided downstream or upstream of the fixed blade, and is arranged above the plastic film. Then, each time the plastic film is intermittently fed, the drive mechanism drives the movable blade, descends, and cuts the plastic film by the cutting edges of the movable blade and the fixed blade. Therefore, the plastic film is cut in the width direction, thereby producing a plastic bag.

In this case, it is necessary to manually process the plastic film at the time of starting the operation of the bag making machine and at the time of adjusting the same. In many cases, the plastic film is manually processed in the vicinity of the cutter, and when the movable blade is raised, the operator is chased by the work and often puts a finger between the movable blade and the fixed blade. For this reason, if the movable blade is accidentally lowered, the finger may be caught between the movable blade and the fixed blade, and the finger may be injured by the cutting edges of the movable blade and the fixed blade. .

[0005]

SUMMARY OF THE INVENTION Accordingly, in the present invention, a fixed blade extending in the width direction of a plastic film is disposed below the plastic film, and a movable blade extending in the width direction of the plastic film is provided downstream or upstream of the fixed blade. In a plastic film cutting cutter arranged above a plastic film and the movable blade is lowered by a driving mechanism, even if the movable blade is accidentally lowered, there is no possibility that an operator may injure a finger. It was made for the purpose of.

[0006]

According to the present invention, the protection bar or the protection plate extending in the width direction of the plastic film is disposed above the fixed blade. The protection bar or the protection plate is close to the movable blade and the fixed blade, the protection bar or the protection plate covers between the movable blade and the fixed blade, and the plastic film is passed between the protection bar or the protection plate and the fixed blade.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below.

In FIG. 1, this is a plastic film cutting cutter of a bag making machine.
For cutting off. Plastic film 1
Extends along a horizontal plane and is intermittently fed by a fixed length.
This cutter comprises a movable blade 2 and a fixed blade 3. In the feed path of the plastic film 1, the fixed blade 3 extends in the width direction of the plastic film 1 and is arranged below the plastic film 1. The movable blade 2 extends in the width direction of the plastic film 1, is provided downstream or upstream of the fixed blade 3, and is disposed above the plastic film 1. In this embodiment, the cutting edges 4 and 5 are formed on the movable blade 2 and the fixed blade 3, and the movable blade 2 is provided downstream of the fixed blade 3 and is disposed above the plastic film 1. , 5 are facing each other.

Further, a driving mechanism such as a link is a movable blade 2
The movable blade 2 is driven by the drive mechanism and descends every time the plastic film 1 is intermittently fed. Therefore, the plastic film 1 is sandwiched between the movable blade 2 and the fixed blade 3, and the plastic film 1 is cut by the cutting edges 4 and 5 of the movable blade 2 and the fixed blade 3. As shown in FIG. 2, the cutting edge 4 of the movable blade 2 is inclined at a certain angle with respect to the cutting edge 5 of the fixed blade 3, the cutting edge 5 extends in the horizontal direction, and the plastic film 1 has the cutting edge. 5 are arranged in parallel. Therefore, when the movable blade 2 descends, first, at one side edge of the plastic film 1, the plastic film 1 is cut by the edges 4 and 5, and the plastic film 1 is cut from one side edge. Thereafter, as the movable blade 2 descends, the plastic film 1 is cut toward the other side edge. Therefore, it can be cut smoothly and reliably.

Further, this cutter has a thin metal protective bar 6. The protection bar 6 has a length corresponding to the movable blade 2 and the fixed blade 3, extends in the width direction of the plastic film 1, and is disposed above the fixed blade 3. Further, the protection bar 6 has a constant height, is disposed parallel to the side surface of the movable blade 2, and is close to the movable blade 2, and the clearance C1 thereof is selected to be about 0.1 mm to 1 mm. Further, the protection bar 6 is close to the fixed blade 3, and the clearance C2 is selected to be about 5 mm. Therefore, the protection bar 6 covers the movable blade 2 and the fixed blade 3 on the upstream side of the movable blade 2, and the plastic film 1 is passed between the protection bar 6 and the fixed blade 3.

Further, in this embodiment, a pair of cylinders 7 are connected to both ends of the protection bar 6, and the protection bar 6 is supported by the cylinders 7. Therefore, cylinder 7
Thus, the protection bar 6 can be lifted. Further, the cylinder 7 is provided with a magnet switch 8, which is connected to a drive mechanism of the movable blade 2. The magnet switch 8 is for detecting the position of the piston in the cylinder 7. Therefore, when the protection bar 6 is lifted by the cylinder 7, the magnet switch 8
Will detect it. Further, the detection signal is sent to the drive mechanism of the movable blade 2, whereby the movable blade 2 is locked, and the movable blade 2 does not descend.

Therefore, in the case of this cutter, the plastic film 1 passes between the protection bar 6 and the fixed blade 3 and is intermittently fed by a fixed length. And for each intermittent feed,
The movable blade 2 is operated by the driving mechanism and descends, and the plastic film 1 is cut by the cutting edges 4 and 5 of the movable blade 2 and the fixed blade 3. Thereby, a plastic bag is manufactured.

Further, as described above, the plastic film 1 is often manually processed near the cutter at the start of the operation of the bag making machine and at the time of adjustment thereof. On the upstream side of the movable blade 2, the protective bar 6 covers the movable blade 2 and the fixed blade 3, and when a worker is working on the upstream side of the movable blade 2, a finger is placed below the movable blade 2. It does not enter, and does not enter between the movable blade 2 and the fixed blade 3. Therefore, even if the movable blade 2 is inadvertently lowered, the finger is caught between the movable blade 2 and the fixed blade 3, and the finger is not injured by the cutting edges 4 and 5 of the movable blade 2 and the fixed blade 3. It is.

On the other hand, when the worker is working on the downstream side of the movable blade 2, the protection bar 6 may be close to the movable blade 2 even if a finger may be inserted below the movable blade 2. Therefore, the finger does not enter between the movable blade 2 and the fixed blade 3. Even if it enters, it is the clearance C1 between the protection bar 6 and the movable blade 2.
Only the depth corresponding to. As described above, the clearance C1 is only about 0.1 mm to 1 mm. Therefore, even if the movable blade 2 unexpectedly descends,
The fingers are not injured by the cutting edges 4 and 5 of the movable blade 2 and the fixed blade 3 and are safe.

When the plastic film 1 is clogged at the position of the protection bar 6 and the movable blade 2, the protection bar 6 can be lifted by the cylinder 7 and the plastic film 1 can be easily processed. As described above, when the protection bar 6 is lifted, the movable blade 2 is locked by the magnet switch 8 and the movable blade 2 does not descend, which is safe.

Instead of the protection bar 6, a protection plate having a height corresponding to the movable blade 2 is disposed above the fixed blade 2 and is brought close to the movable blade 2 and the fixed blade 3, and the movable plate 2 is moved by the protection plate. And the fixed blade 3 may be covered.

[0017]

As described above, according to the present invention, the movable bar 2 and the fixed blade 3 are covered with the protection bar 6 or the protection plate on one side of the movable blade 2, so that the operator can move the movable blade 2. When working on one side, the finger does not enter below the movable blade 2 and does not enter between the movable blade 2 and the fixed blade 3. Therefore, even if the movable blade 2 is accidentally lowered, the finger is not caught between the movable blade 2 and the fixed blade 3, and the finger is not injured by the cutting edges 4 and 5 of the movable blade 2 and the fixed blade 3. Conversely, when the worker is working on the other side of the movable blade 2, the finger may be put below the movable blade 2, but the protection bar 6 or the protection plate may be moved by the movable blade 2.
And the finger does not enter between the movable blade 2 and the fixed blade 3. Therefore, even if the movable blade 2 is inadvertently lowered, the finger is caught between the movable blade 2 and the fixed blade 3, and the finger is not injured by the cutting edges 4 and 5 of the movable blade 2 and the fixed blade 3. And can achieve the intended purpose.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a front view of a movable blade, a fixed blade, and a protection bar of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Plastic film 2 Movable blade 3 Fixed blade 4,5 Cutting edge 6 Protection bar

Claims (1)

[Claims] In a feed path of a plastic film, a fixed blade extending in a width direction of the plastic film is disposed below the plastic film, and a movable blade extending in a width direction of the plastic film is located downstream of the fixed blade. Or a plastic film cutting cutter provided on the upstream side, arranged above the plastic film, lowered the movable blade by a driving mechanism, and cuts the plastic film by a cutting edge of the movable blade and the fixed blade. Disposing a protection bar or a protection plate extending in the width direction of the plastic film above the fixed blade, bringing the protection bar or the protection plate close to the movable blade and the fixed blade,
A plastic film cutting cutter, wherein a space between the movable blade and the fixed blade is covered with the protection bar or the protection plate, and the plastic film is passed between the protection bar or the protection plate and the fixed blade.