JPS6353095B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for cutting a film in a turret type film winder.

As shown schematically in FIG. 1, a conventional winding machine of this type includes a fixed guide roller 1, guide rollers 2 and 3 pivotally supported at both ends of a turret (not shown), and a winding auxiliary roller 7. The arm 6 pivots in the direction of the arrow 10 and the cutter 9 is supported and the arm 6 rotates in the direction of the arrow 10
It is composed of an arm 8 that rotates in one direction. Then, a plurality of bobbins for film winding are prepared, and after a predetermined length of film is wound on the first bobbin, this is cut to make a full bobbin (hereinafter referred to as full bobbin 4). ) is moved to the position indicated by the two-dot chain line, and then the winding auxiliary roller 7 and cutter 9 are rotated in the directions of arrows 10 and 11, respectively, to cut the film. Next, empty bobbin (hereinafter referred to as bobbin 5)
) is mounted on the turret, and a new winding is performed, and the winding is continued until the pipe is full again.

Generally, as the winding speed increases, it is very important whether the cutting operation of the film F can be carried out without any trouble. However, a distance a is required from when the cutter 9 contacts the film F until it cuts it. However, the longer the distance a, the longer the time required for cutting, which is a major obstacle to speeding up the process. In particular, in the case of a film that stretches easily, the distance a tends to be large.

Therefore, as a measure to shorten the distance a, as shown in FIG.
It is conceivable to reduce the distance L in the figure. However, in this case, there was a risk that the maximum winding diameter of the full bobbin 4 would interfere with the guide roller 2.

The present invention aims to provide a cutting method for a film winder that eliminates the above-mentioned drawbacks. During the winding operation, the guide roller is placed in a standby position where it does not interfere with the surface of the film having the maximum winding diameter. Film winding in which the guide roller is rotated to the empty bobbin side to cut the film after the turret is reversed when the tube is full and the guide roller is then returned to the standby position. This relates to the cutting method used in the cutting machine.

Next, the present invention will be described with reference to the most preferred embodiment shown in FIG. 3. For convenience of explanation, the same parts as in the conventional example shown in FIG.

Arms 21 and 22 are rotatably supported on a turret (not shown). 23 and 24 are main arms, and air cylinders 25 and 26 are respectively installed between the arms 21 and 22, and the guide rollers 2 and 3 are moved along with the arms 21 and 22 by the arrow 27.
direction.

In this embodiment, during the winding operation, the guide rollers 2 and 3 are at the position indicated by the solid line (hereinafter referred to as the standby position), and the film F is wound onto the bobbin 4 until it reaches full capacity. At this time, the guide roller 2 is at a position where it does not interfere with the film surface even if the maximum winding diameter is reached.

When the turret reaches full capacity, the turret is reversed in a known manner, and the air cylinder 26, which has come to the position of the air cylinder 25 due to this reversal, is operated.
The guide roller 3 is brought closer to the empty bobbin 5 as indicated by the two-dot chain line in FIG. Next, the auxiliary roller 7 for winding the cutter 9 is rotated to cut the film F, and the air cylinder 26 is operated again to return the guide roller 3 to the standby position to carry out a predetermined winding operation.

As detailed in the above embodiments, the present invention has the following features:
Since the distance L is shortened only during cutting, it is possible to reliably cut even when winding at high speed or when the film is easily stretched, improving productivity and expanding versatility.

[Brief explanation of drawings]

FIG. 1 is a schematic side view of a conventional example, FIG. 2 is an explanatory diagram showing a procedure for cutting a film in the conventional example, and FIG. 3 is a schematic side view showing an embodiment of the present invention. 2, 3: Guide roller, 4: Full bobbin, 5:
Empty bobbin, 21, 22: Arm, 23, 24: Main arm, 25, 26: Air cylinder.

Claims (1)

[Claims] 1. A guide roller is provided at a point symmetrical position with respect to the rotation center of an empty bobbin and a full bobbin, which are arranged at a point symmetrical position, and a cutter provided on a rotating arm separate from the guide roller during cutting. In a turret type cutting device for a strip of film or the like that is lowered between the empty bobbin and the same guide roller, the guide roller is placed at a standby position where it does not interfere with the surface of the film having the maximum winding diameter while the film is being wound. After the film is fully loaded, the turret is reversed, the guide roller is rotated toward the empty bobbin side, the film is cut, and the guide roller is returned to the standby position. A cutting method in a film winder characterized by: