JPH07277558A - Wound film switching method and its device in film winding machine - Google Patents

Abstract

PURPOSE:To prevent a film being scratched when switching a wound film. CONSTITUTION:When switching the core A6 which has wound a film 4 which is sent continuously and an empty core B8 by turning them, core turning speed is made to lower directly before the contact of the empty core B8 to the film 4 which is being rewound around the core A6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a film winding machine for winding a film which is continuously fed, after winding a film of a predetermined length on a core and then winding the film on the next core. The present invention relates to a winding film switching method and device when switching.

[0002]

2. Description of the Related Art A film winding machine having two or more winding shafts is usually used for continuously winding a film which is continuously fed while switching a winding core. A method of winding a film of a predetermined length on one core, cutting the film in the width direction, winding the cut end on the next empty core, and continuously winding the film on the core. Is taken.

In this type of film winding machine, normally,
The film wound into a roll for a predetermined length is swung together with the core to the product take-out position, the empty core for the next winding is swung to the wind-up position, and the winding film accompanied by the cutting is swung at the position after the predetermined swiveling. Switching is performed.

For example, as shown in FIGS. 5 to 7, the core 102 is placed at the film winding position C of the film winding machine 101.
When the film 103 having a predetermined length is wound on the winding film roll 104, the winding film roll 104 together with the core 102 is taken out at the product take-out position D.
(FIG. 7), the empty core 105 that has been swiveled and previously mounted
Is rotated to the winding position C (hereinafter sometimes referred to as a turret). Then, the cutter 1 in the state shown in FIG.
The film 103 is cut by 06, the cut end is wound around the empty core 105, and the next winding is started.

[0005]

In the above series of winding film switching operations, as shown in FIGS. 6 and 7, the swung empty core 105 is wound onto the core 102 and the film 103 is being wound. The film 103 is swung to the winding position C which is a fixed position in a state where the film 103 is pushed in. At this time, if there is a large difference between the peripheral speed of the empty core 105 and the traveling speed of the film 103, the surface of the core 105 scratches the surface of the film 103 and scratches occur. The peripheral speed is controlled so as to be synchronized with the film traveling speed.

However, perfect tuning of this speed is extremely difficult in reality, and more or less speed difference occurs. In particular, when the empty core 105 during turning pushes the running film 103 a little, the film 103 is pulled toward the unwinding side with respect to the take-up film roll 104, and the above-described perfect synchronization is extremely difficult. so,
In reality, a slight speed difference will occur.

Due to this speed difference, scratches are generated on the surface of the film 103, and the film wound on the core 102 with the scratches remains is scrap. This problem occurs especially when the empty core 105 starts to contact the moving film 103. When the winding angle of the film 103 around the empty core 105 becomes large to some extent, the frictional force between them causes
Speed tuning is also possible.

In view of the above problems, the present invention prevents the occurrence of scratches in a turret type film winding machine due to the empty core coming into contact with the running film when the winding film is switched. The ultimate aim is to suppress the generation of waste film and improve the quality of the winding film.

In the prior art as well, there is a technique for slightly lowering the turning speed just before the empty core 105 reaches the regular film winding position C for stopping the core at a fixed position. There is no conventional technique for changing the turning speed in relation to the contact start position between the empty core 105 and the running film 103, and the present invention is essentially different from such a fixed position stopping technique.

[0010]

SUMMARY OF THE INVENTION In order to achieve the above object, a method of switching a winding film in a film winding machine of the present invention is to wind a continuously fed film on a core A in a roll shape, and to wind the film. The film roll is rotated together with the core A to the product take-out position, the empty core B is turned to the film take-up position, the film is cut in the width direction, the cut end is wound on the empty core B, and the next winding is started. In the winding film switching method in the film winding machine, the core turning speed is made lower than the turning speed from immediately before the empty core B comes into contact with the film being wound on the core A to the turning speed up to that point. And the method.

The core turning speed is preferably reduced to 1/10 or less of the previous turning speed.

The take-up film switching device in the film take-up machine according to the present invention has at least two take-up shafts for taking up continuously fed films,
The winding film roll wound in a roll shape on the core A mounted on one winding shaft is placed together with the core A at the product take-out position, and the empty core B mounted on another winding shaft is placed at the winding position. In the film winding machine having the turret control means for turning, the turret control means is controlled to set the core turning speed from the turning speed immediately before the empty core B comes into contact with the film being wound on the core A until then. It is also characterized in that a turning speed changing means for reducing is also connected.

The turning speed changing means is capable of setting the turning speed after reduction to any speed, and as described above.
It is preferable to set the speed to 1/10 or less of the speed before the decrease.

Further, it is preferable that the film winding machine is provided with speed tuning means for substantially synchronizing the running speed of the film continuously fed with the peripheral speed of the empty core B. Furthermore, if the surface of the core is finished to 5S or less (preferably 0.5 to 1S), scratches are less likely to occur even when the running film comes into contact with the core, which is desirable.

[0015]

In such a method and apparatus of the present invention,
When the empty core B is turned to the film winding position when the winding film is switched, the turning speed is, for example, until just before the running film being wound on the core A comes into contact with the empty core B. The speed is reduced to a very low speed of 1/10 or less. As a result, the empty core B starts contacting the running film extremely softly, and the film is not suddenly pushed in. Therefore, even if there is a slight speed difference between the peripheral speed of the empty core B, which is about to be synchronized with the film traveling speed, and the speed of the film during traveling, scratches may actually occur on the film surface. Disappears.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described below with reference to the drawings. 1 to 3 show a winding film switching device in a film winding machine according to an embodiment of the present invention, and FIG. 4 shows a turning speed characteristic at the time of switching. Further, FIG. 1 shows the final state of steady winding, FIG. 2 shows the turning (turret) midway state, and FIG. 3 shows the turning end state.

1 to 3, reference numeral 1 denotes an entire film winding machine having two winding shafts 2 and 3, and 4
Indicates a film that is continuously sent. The film 4 is wound in a roll shape on the core A6 mounted on the winding shaft 2 while applying an appropriate surface pressure by the contact roll 5. When the film 4 is wound for a predetermined length, the winding film roll 7 is swung (turret) together with the core A6 from the film winding position C to the product unloading position D (also serving as an empty core mounting position). At this time, the empty core B8 for the next winding is attached to the winding shaft 3 in advance. In the present embodiment, the film winder 1 is configured to have the two winding shafts 2 and 3, but the present invention is also applicable to a film winding machine having three or more shafts.

In the present embodiment, the turning is performed through the turret wheel 9, and is started by activating a turret motor 10 connected to the turret wheel 9 through a gear mechanism. The motor 10 is controlled based on a signal from the control device 11. The control device 11 includes a turret control device 12 (turret control means) that controls turning of the core A from the winding position C to the product unloading position D and of the empty core B from the position D to the winding position C. A turning speed control device 13 (turning speed changing means) is provided which is connected to the turret control device 12 and changes and controls the turning speed on the way.

Motors 14 and 15 for driving (rotating) the core are connected to the winding shafts 2 and 3, respectively. Control devices 16 and 17 are connected to the motors 14 and 15, and the control devices 16 and 17 include steady winding control devices 18 and 19 for controlling the winding torque and the tension of the winding film.
And speed tuning devices 20 and 21 (speed tuning means) for tuning the peripheral speed of the empty core to the speed of the running film.

Reference numerals 22 and 23 denote guide rolls for guiding the film 4 being wound on the core A side to a predetermined path when the winding film is switched. Also,
Reference numeral 24 in FIG. 3 denotes a cutter that cuts the film 4 in the width direction during traveling, and in the present embodiment, the cutter 24 constitutes a so-called traversing cutter that travels in the film width direction.

The method of the present invention is carried out as follows using the apparatus as described above. As shown in FIG. 1, the core A6
When the film 4 is wound up for a predetermined length, as shown in FIG. 6, the take-up film roll 7 moves toward the product take-out position D together with the core A6, and the empty core B8 previously attached to the take-up position C. Turned towards. The turning speed is a steady turning speed by the turret controller 12.

When the empty core B8 approaches the running film 4, immediately before the empty core B8 contacts the film 4, the turning speed is reduced to 1/10 or less of the steady turning speed, for example, 1/20. . This change of the turning speed is performed based on a signal from the turning speed control device 13. That is,
As shown in FIG. 4, immediately before the start of contact with the film 4,
The steady turning speed V1 is changed to the low turning speed V2. Then, the low-speed turning speed V2 is maintained as it is, the empty core B8 is turned to the fixed position of the winding position C, and the state shown in FIG. 3 is obtained. In the state of FIG. 3, the running film 4 is cut by the cutter 24, the cut end is wound around the empty core B8, and the next winding is started.

In the above turning, at the moment when the empty core B8 comes into contact with the running film 4, the turning speed has already been reduced to a very low speed, so the empty core B8 moves extremely softly to the running film 4. The contact will start. Therefore, the empty core B8 does not push the film 4 suddenly, and the contact resistance during this period does not suddenly increase.
As a result, it is possible to prevent the surface of the film 4 that is running from being scratched.

At this time, if the surface of the empty core B8 is finished to a highly accurate surface of about 0.5S, the occurrence of scratches can be prevented more reliably.

When the turning progresses and the film winding angle on the empty core B8 becomes large to some extent, the peripheral speed of the empty core B8 and the traveling speed of the film 4 which were controlled so as to be synchronized until then due to the frictional force between the two. And are perfectly synchronized. At this stage, there is no risk of scratches. in this way,
In the present invention, the occurrence of scratches is effective mainly for a while from the time when the empty core B8 starts to contact the film 4, that is, in the section where scratches have been or were likely to occur conventionally. To be prevented.

[0026]

As described above, according to the winding film switching method and device in the film winding machine of the present invention, the turning speed is reduced from immediately before the turning empty core comes into contact with the running film. Since it is set to a low speed, it is possible to reliably prevent the occurrence of scratches on the film surface even after contact with the film, prevent the occurrence of product loss due to scratches, and prevent scratches from beginning to end. It is possible to improve the product quality by allowing the non-existing film to be wound up.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a winding film switching device in a film winding machine according to an embodiment of the present invention.

FIG. 2 is a schematic configuration diagram showing a state in the middle of turning of the device of FIG.

FIG. 3 is a schematic configuration diagram showing a state of the device of FIG. 1 when turning is completed.

FIG. 4 is a relationship diagram between the empty core position and the turning speed of the device of FIG.

FIG. 5 is a schematic configuration diagram of a conventional film winding machine.

6 is a schematic configuration diagram showing a state in the middle of turning of the device of FIG.

FIG. 7 is a schematic configuration diagram showing a state of the device of FIG. 5 when turning is completed.

[Explanation of symbols]

 1 Film Winder 2, 3 Winding Shaft 4 Film 5 Contact Roll 6 Core A 7 Winding Film Roll 8 Empty Core B 9 Turret Wheel 10 Turret Motor 11 Controller 12 Turret Controller 13 Turning Speed Controller 14, 15 Core rotation drive motor 16,17 Control device 18,19 Steady winding control device 20,21 Speed tuning device 22,23 Guide roll 24 Cutter

Claims (6)

[Claims] 1. A film which is continuously fed is made into a core A.
It is wound up in a roll shape, and the winding film roll is swung together with the core A to the product take-out position, the empty core B is turned to the film take-up position, the film is cut in the width direction, and the cut end is placed on the empty core B. In the winding film switching method in the film winding machine, which starts winding next to the film, the core turning speed is changed from immediately before the empty core B comes into contact with the film being wound on the core A, The method for switching the winding film in the film winding machine is characterized in that the rotating speed is lower than the rotation speed up to. 2. The winding film switching method in a film winding machine according to claim 1, wherein the core turning speed is reduced to 1/10 or less of the previous turning speed. 3. A take-up roll wound on a core A having at least two take-up shafts for taking up continuously fed film and mounted on one take-up shaft. A film winding machine having a turret control means for rotating a film roll together with a core A to a product take-out position and an empty core B mounted on another take-up shaft to a take-up position. Is connected to a turning speed changing means for lowering the turning speed from immediately before the empty core B comes into contact with the film being wound on the core A until then, to a film winding machine. Tori film switching device. 4. The winding film switching device in a film winding machine according to claim 3, wherein the turning speed changing means can set the turning speed after reduction to an arbitrary speed. 5. The film winding machine comprises speed tuning means for substantially synchronizing the traveling speed of the continuously fed film with the peripheral speed of the empty core B. The winding film switching device in the film winding machine of No. 4. 6. The winding film switching device in a film winding machine according to claim 3, wherein the surface of the core is finished to 5S or less.