JPH04350061A - Automatic film winding device - Google Patents

Abstract

PURPOSE:To provide an automatic film winding device where the time required to cut the film is shortened, the film scrapping is reduced, and the rate of operation of the manufacturing line is improved. CONSTITUTION:There is provided a film cutting mechanism fitted with a pair of cutter knives 28 which can be moved in the opposite direction to each other in the transverse direction of a travelling film 3, and the film 3 is shifted so as to remove slackening of the film by shifting the first pass roller 16 which is capable of being approached to the cutting position of the cutter knives 28. There is provided the second pass roller 17 which moves the film 3 close to a scrapping roller 7 which drives the film in a rotatable manner and guides the film to the winding position, and a transverse cutter 22 which cuts the film traversely between the slits of the film 3 to be cut by the cutter knives 28 is provided.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic film winding device used as an emergency winding device between a longitudinal stretching machine and a tenter oven for horizontal stretching in a biaxially stretched film production line.

0002

[Prior Art] Generally, in a biaxially stretched film production line, when a film of material is fed into a tenter oven for horizontal stretching and is in the horizontal stretching process, the temperature distribution inside the oven is appropriate for the film properties. If the film is not stretched properly, or if foreign matter is mixed in, the film may not stretch uniformly and may tear in the vertical direction from a thinner point. Therefore, in this case, it was necessary to feed the paper again from the entrance of the tenter oven.

[0003] Therefore, it is necessary to cut the supplied film before transverse stretching, wind it up on a scrap roll, and quickly remove the film inside the oven. As a conventional example of a mechanism for cutting a film between a longitudinal stretching machine and a transverse stretching section, one shown in FIG. 6 has been proposed. In FIG. 6, the film 3 normally comes out of the longitudinal stretching machine 1, passes between rolls 4, 5, and 6, and is sent to the transverse stretching machine 2, as shown by the two-dot chain line. At this time, the film 3 is brought close to the scrap roll 7 by the pass roll 9, and the film 3 supported by the pass roll 9 and the touch roll 10 is cut off with a cutter 8 having a saw blade and having the full width of the film.
At the same time, use the touch roll 10 to remove the cut end of the film 3.
The film 3 is wound by being pressed against a scrap roll 7 (which is vacuum-adsorbed or coated with double-sided adhesive tape).

0004

[Problems to be Solved by the Invention] After longitudinal stretching using the conventional longitudinal stretching machine shown in FIG. Because it is difficult to cut, a cutter that covers the full width of the film would easily fail to cut the film, making automatic winding difficult. In order to apply a constant tension to the film during the longitudinal stretching and transverse stretching, the feeding speed for the transverse stretching was set slightly higher than the film speed of the longitudinal stretching machine.

When the pass roll 9 in FIG. 6 comes down to bring the film 3 closer to the scrap roll 7, the distance the film 3 must travel becomes longer, so the film feed speed of the transverse stretching machine 2 must be temporarily lowered. Then, at the time of cutting, the film speed must be increased again to maintain tension in the film. In addition, the film feeding device of the horizontal stretching machine is large and heavy, so it takes a considerable amount of time to slow down and increase the speed, which increases the amount of film that becomes scrap and reduces the operating rate. there were. The present invention has been proposed to solve the above-mentioned conventional problems.

[0006]

[Means for Solving the Problems] Therefore, the present invention provides two parts that can move in opposite directions in the width direction of the running film.
A film cutting mechanism equipped with a pair of cutter knives, a first pass roll that brings the film close to the cutting position of the cutter knife, and a scrap that moves the film so that it does not loosen due to the movement of the first pass roll, and at the same time drives the film to rotate. a second pass roll that approaches the roll and guides it to a winding position; a transverse cutter that traverses the film between the slits of the film cut by the cutter knife when the second pass roll approaches the scrap roll;
a touch roll that is attached to the support member of the second pass roll and moves together with the second pass roll to press the end of the ribbon-like film that has been traversed by the transverse cutter against the scrap roll; The ribbon-shaped film ends can be adsorbed or adhered to each other, and this is a means to solve the problem.

[0007]

[Operation] First, the first pass roll and the second pass roll move simultaneously to change the path of the film, and the film contacts the tip of the cutter knife to cut two vertical slits near the center of the film. Next, the transverse cutter cuts the ribbon-like film between the longitudinal slits of the film, and at the same time, the touch roll presses the cut end of the film against the suction or adhesive surface of the scrap roll, and the winding of the scrap roll begins. The cutter knives are then spread laterally in opposite directions to cut away the film in a figure-eight pattern.

[0008]

[Example] The present invention will be explained below with reference to the drawings. Figures 1 to 5 show examples of the present invention. The installed automatic film winding device is shown, and FIGS. 2 to 5 show the operating sequence of the device. Now, in FIG. 1, a film 3 is stretched in the longitudinal direction in a longitudinal stretching machine 1, and is sent to a feed roll 4 from the direction shown by the arrow. When the film 3 is being processed smoothly, the film 3 is transferred from the feed roll 4 to the first pass roll 16 and the feed roll 15 as shown by the solid line.
, 5 and 6, and then sent to a horizontal stretching machine 2 (tenta oven).

However, an accident occurs after the transverse stretching machine 2, and when the film 3 is cut in front of the transverse stretching machine 2, the path taken by the film 3 is as shown by the two-dot chain line in FIG. That is, the film 3 passes from the feed roll 4 to the first pass roll 16 shown by the two-dot chain line, passes through the feed roll 15, and passes through the second pass roll 17 and the feed roll 5 shown by the two-dot chain line.
, 6 and then sent to a transverse stretching machine. Further, the first pass roll 16 is supported by the first actuating arm 18 and rotated in the A direction about the X axis by the actuator 23. The cutter device 21 is installed so that the cutting edge of the cutter knife 28 just pierces the film 3 when the film 3 is moved by the second pass roll 17 to the position indicated by the two-dot chain line.

The second pass roll 17 is connected to the second actuating arm 19
It is supported by the actuator 24 and rotated in the direction B around the Y axis. Also, the second pass roll 1
7 moves to the position indicated by the two-dot chain line, the film 3 approaches the scrap roll 7, and at the same time the second actuating arm 1
Touch roll arm shaft 2 attached to rotate at 9
The touch roll 20 on 9 also has a torsion spring 26 shown in FIG.
Press lightly with the action of The touch roll 20 is stopped by a stopper (not shown) to prevent excessive rotation, and the scrap roll 7 is driven by a motor 27 within a predetermined torque range. Further, a double-sided adhesive tape of an appropriate width is wrapped around the center outer periphery of the scrap roll 7. Reference numeral 22 denotes a transverse cutter that traverses the ribbon-like film between two vertically cut slits when cutting the film 3, and the transverse cutter 22 is operated by an actuator 25.

Next, the operating state of the automatic film winding device shown in the embodiment shown in FIG. 1 will be explained with reference to FIGS. 2 to 5. 2 shows a state in which the film 3 is being fed in the direction of the arrow without any problems, but if a problem occurs in the process after horizontal stretching, the actuators 23 and 24 are actuated simultaneously, and the first actuating arm 18 and the second actuating arm The arms 19 rotate in directions A and B around the axes X and Y, respectively, resulting in the state shown in FIG. 3.

At this position, the film 3 is cut with a cutter knife 28.
It pierces through, creating two longitudinal slits 3a. Next, the scrap roll 7 starts rotating in the direction C at a peripheral speed slightly faster than the film speed. In this position, the touch roll 20 remains on the film 3 and does not contact the scrap roll 7 yet. Next, the transverse cutter 22 is actuated by the actuator 25 and begins to rotate in the direction of arrow D.

FIG. 4 shows the state immediately after the ribbon-like film between the slits 3a of the film 3 is cut across by the transverse cutter 22. 3b indicates the transverse edge of the film 3. Further, the touch roll 20 presses the ribbon-shaped film end 3b against the scrap roll 7 by the torsion force of the torsion spring 26, and the double-sided adhesive tape attached to the outer periphery of the scrap roll 7 adheres the film end 3b and starts winding. . Next, the pair of cutter knives 28 attached to the cutter device 21 begin to move in opposite directions, that is, in the directions of the arrows.

FIG. 5 shows the pair of cutter knives 28 having moved to both ends of the cutter device 21 and finished diagonally cutting the film 3;
The scrap roll 7 continues to wind the film until the problem in the next process is resolved and the paper begins to feed again. 3c in FIG. 5 shows the diagonally cut end of the film. Next, the first pass roll 16,
The second pass roll 17 and the transverse cutter 22 are returned to their original positions (Fig.
position). The cutter knives 28 also approach each other and return to their original positions shown in FIG.

As another embodiment, a scissor-type knife that opens and closes the knife portion using an actuator is installed in place of the transverse cutter 22, and the touch roll 20 is installed at an angle with respect to the film surface. When it comes into contact with the film 3, the film surface may be twisted and cut with the same knife. Further, instead of the transverse cutter 22, a normal rotary cutter may be used. On the other hand, these transverse cutters may be placed at any position downstream of the touch roll 20, and do not necessarily need to be attached to the arm of the second pass roll 17, and the same effect can be obtained even if they are fixed. In this case, the slit 3a is simply wound around the scrap roll 7 and there is no problem at all.

[0016]

As described above in detail, according to the present invention, the width of the transverse cutter is small, and cutting can be performed reliably with a small cutter. Furthermore, since there is no need to reduce or increase the film feed speed for transverse stretching, the time required for cutting the film is shortened, film scraps are reduced, and the operating rate of the production line is increased.

[Brief explanation of drawings]

FIG. 1 is a side view of an automatic film winding device according to an embodiment of the present invention.

FIG. 2 is a perspective view illustrating the operating state of FIG. 1;

FIG. 3 is a perspective view showing a different operating state from FIG. 2;

FIG. 4 is a perspective view of the operating state following FIG. 3;

FIG. 5 is a perspective view of the operating state continued from FIG. 4;

FIG. 6 is a side view showing a conventional film winder.

[Explanation of symbols]

1 Longitudinal stretching machine 2 Lateral stretching machine 3 Film 7 Scrap roll 16 1st pass roll 17 2nd pass roll 20 Touch roll 21 Cutter device 22 Transverse cutter 28 Cutter knife

Claims (1)

[Claims] 1. A film cutting mechanism comprising a pair of cutter knives that can move in opposite directions in the width direction of the running film; a first pass roll that brings the film closer to the cutting position of the cutter knife; The movement of the first pass roll moves the film to prevent it from loosening, and at the same time, the second pass roll approaches the scrap roll that rotates the film and guides it to the winding position, and when the second pass roll approaches the scrap roll, a cutter is moved. A transverse cutter that traverses the film between the slits of the film cut by the knife, and a ribbon-shaped cutter that is attached to the supporting member of the second pass roll and moves with the second pass roll and is cut across by the transverse cutter. An automatic film winding device comprising: a touch roll that presses an end of the film against a scrap roll, the scrap roll capable of adsorbing or adhering the end of the ribbon-shaped film.