JPS63195B2 - - Google Patents

Description

Detailed Description of the Invention [Industrial Application Field] The present invention relates to a cutter driving method and apparatus for a traverse cutter used in a film winding machine, which cuts a running film in the width direction by moving the cutter laterally. Regarding.

[Prior Art] In general, there are two methods for cutting film using a film winder: a method in which the running film is cut at once with a serrated cutter that extends across the entire width of the film (cross cut), and a method in which a running film is cut at once with a saw blade cutter that extends across the entire width of the film (cross cut). A method of cutting a running film while moving a cutter laterally (traverse cut) is known.

However, the cross cut has a problem in that as the film running speed increases, it becomes difficult to properly cut the film, so a traverse cut is generally used to cut a film running at high speed.

However, in traverse cutting, the running film is cut by driving the cutter in the width direction of the film, so the cut is diagonal to the longitudinal direction of the film, resulting in film loss over the length of the cut section. There's a problem. Therefore, in traverse cutting, it is necessary to increase the traverse speed of the cutter in order to keep the film loss as low as possible.

[Problems to be Solved by the Invention] However, high-speed traversal of the snails is not necessarily easily achieved because it is actually subject to various limitations as described below.

In other words, in order to make the cutter traverse at high speed, it is necessary to rapidly accelerate the cutter at the start position of the cutter, move at high speed, and stop the cutter suddenly at the end position of the cutter. This was extremely difficult and contributed to the limitation of traverse speed.

In addition, when cutting film using a traverse cut, the cutter needs to be tilted at an appropriate angle with respect to the direction perpendicular to the film running direction, depending on the film running speed and the cutter traversing speed, and this angle is within an appropriate range. If it comes off, the film cutting resistance will increase and cause problems such as film tearing. The appropriate angle of the cutter is determined mainly by the relative relationship between the film running speed and the cutter traversing speed, and in general, the optimal angle is the one that provides the smallest cutting resistance under certain conditions of film running speed and cutter traversing speed. It's an angle. The above-mentioned troubles are more likely to occur as the cutter speed increases, and this also limits the ability to increase the cutter traverse speed.

Furthermore, in order to prevent troubles due to the above-mentioned poor cutter angle, it may be possible to determine the optimal cutter angle through testing and set it at that angle, but even if set in this way, the cutter traverse speed is usually constant On the other hand, the running speed of the film varies depending on the film forming conditions and conditions, and the optimal angle of the cutter also changes accordingly, making it difficult to fix the mounting angle to a constant value. . Incidentally, in order to obtain the optimum cutter angle, it is known that the cutter is rotatably mounted and the cutter angle is changed naturally and freely so as to minimize the film cutting resistance, but this is not reliable and This may also lead to film cutting errors.

In order to solve the above-mentioned problems, the present invention enables high-speed lateral movement of the cutter by making it possible to stop the cutter suddenly, and cuts by constantly maintaining the installation angle of the cutter at an optimum angle with respect to the film running direction. The purpose of the present invention is to provide a cutter driving method and device capable of preventing the occurrence of troubles, and ultimately to minimize film loss during film cutting and ensure reliable film cutting.

[Means for solving the problem] In order to achieve this object, in the cutter driving method of the present invention, the running film is cut by a cutter that is driven transversely to the film running direction. is rapidly accelerated from the starting end of the traverse, and then is driven traversely at a speed proportional to the film running speed, that is, at a speed equal to the film running speed multiplied by a predetermined constant ratio. This cutter drive is canceled by interrupting the drive force transmission path for the cutter traverse in the middle of the cutter traversal route, and after the drive is released, the remaining traverse route is affected by the inertia of the drive system from the cutoff point to the cutter. The force causes the cutter to traverse to the end of the traverse. At this time, the cutter is naturally decelerated and stopped by braking at the traverse end. As a result, even if the cutter is driven traversing at high speed, the inertia force is attenuated during the traverse after the driving force transmission path is cut off, so that the cutter can be easily stopped abruptly at the end of the traverse. Therefore, it becomes possible for the cutter to move at high speed. In addition, the traversing speed of the snail is
Even if the film running speed changes or changes,
Since the cutter traversing speed follows this and is directly proportional to the film running speed, the relative angle between the cutter and the running film can always be kept at a constant, appropriate angle, resulting in stable cutting performance even for high-speed running films. is ensured.

In the cutter drive system directly used for carrying out the method of the present invention, the cutter drive system is connected to the roll drive system of the film winder via a clutch of a drive power transmission device. In addition, a plurality of detectors for detecting the passing of the cutter are arranged in the cutter traverse path, and based on the cutter passage signal from one of the detectors, the connection of the clutch is interrupted by a signal from the control device. It's becoming like that. After the clutch is disengaged, the inertia of the drive system from the clutch to the cutter causes the cutter to traverse to the end of its traversal movement. In this way, by connecting the cutter drive system to the roll drive system of the film winder, the cutter traversing speed is directly proportional to the film running speed, and even if the film running speed changes, the film will continue to run. The speed is a constant ratio to the speed. When the clutch is engaged, the cutter is rapidly accelerated by the large drive inertia of the roll drive system, and at the appropriate position in the traversal stroke, the clutch is shut off by a signal from the detector and continues to traverse due to the inertia.
Since the inertial force is gradually attenuated, the cutter can be easily braked to a stop at the traverse end. Therefore, as above,
Stable cutting performance is achieved with high-speed traversal of the cutter.

[Embodiments] Hereinafter, preferred embodiments of the cutter driving device of the present invention will be described with reference to the drawings.

FIG. 1 shows the winding section of a film winding machine equipped with the cutter drive device of the present invention, and shows the state before the film is cut.

In the figure, reference numeral 1 denotes a traveling film, and the winding core 2 that has wound the film 1 for a certain length is placed on the take-out position B side, and the winding core 2a that will wind the film from now on is placed on the winding position A side by the turret arm 3. It was stopped after being turned. Reference numeral 5 denotes a guide roll rotatably supported at the tip of an enveloper arm 4 which is provided in a pair in a direction perpendicular to the paper surface of the drawing;
is a guide roll that is rotatably supported by a pair of arms 6 that are swingably provided at the tip of the enveloper arm 4. When cutting the film, the envelope arm 4 is rotated from below to above about the fulcrum 4', and the guide rolls 5 and 7 are positioned so as to cover the winding core 2a with a gap between them, thereby cutting the film. 1, a sufficient winding angle θ' around the winding core 2a is ensured.

A cutter traverse device as shown in FIGS. 2 to 4 is provided between the guide roll 5 and guide roll 7 of the arm 6, and a cutter traverse device is provided on the outer surface of one arm 6 for the cutter traverse. A drive transmission device is provided.

The cutter traveling device includes a stay 8 passed between a pair of arms 6, and a winding core 2a at the top and bottom of the stay 8.
a pair of rails 9 extending parallel to and facing each other, a running piece 11 having four rollers 10 that fit into the rails 9 and are provided so as to be able to roll on the surface of the rails 9; A second plate member 12 attached to the bottom of the plate member 12 and a second plate member 12 attached to the lower part of the plate member 12 and bent from above the surface of the plate member 12.
As shown in the figure, it consists of a holder 13 extending obliquely to the film running direction. Of these cutter traverse devices, the traveling piece 11 is made of aluminum, which is a lightweight material, and it is desirable that the other traveling members be made of lightweight materials as much as possible. A cutter 14 is attached to the tip of the extending portion of the holder 13, and the cutter 14 is formed at an oblique angle with a constant angle θ with respect to a direction perpendicular to the film running direction, as shown in FIG. As shown in FIG.
The blade is installed so that the cutting edge gradually points upward. Moreover, as shown in FIG. 4, the cutter 14 is
The film cutting part of the cutting edge is installed in a position extremely close to the winding core 2a immediately after the film 1 is peeled off from the winding core 2a, and the film 1 immediately after cutting is easily removed from the winding core 2a by static electricity. It seems to be wrapped around.

The driving force transmission device for traversing the cutter consists of a belt 15 whose ends are connected to both sides of the running piece 11, and a pulley that supports the belt 15 at a position outside a pair of arms 6 and tensions the belt 15. 16, 17, and a large capacity clutch/brake unit 18 that transmits driving force to one pulley 16 and has both a clutch function and a brake function.
It consists of a bevel gear unit 20 which transmits the driving force from the shaft of the guide roll 7 to the clutch/brake unit 18 via a coupling 19. The guide roll 7 is driven by the pulley 2
1. belt 22, pulley 23, pulley 24 rotatable together with pulley 23, and belt 2
This is carried out by a roll drive device of a film winding machine (not shown) via 5.

On the side surface of the upper rail 9, there are proximity switches 26, 2 at a position corresponding to the end of the traverse stroke of the cutter 14, and at a position in the middle of the traverse stroke.
7 and 28 are arranged via a bracket 29. Although there are three proximity switches in this embodiment, any number may be used as required. Further, although other types of switches may be used as the proximity switch, a non-contact type switch is preferable in consideration of the case where the cutter traversing speed is high. Furthermore, instead of such switches, a device that can continuously detect the position of the cutter while it is moving may be used. Proximity switch 2
6, 27, 28 are provided at positions where their respective detection parts can detect the passage of the upper end of the traveling piece 11, and the proximity switches 26, 27, 2
In response to a detection signal from the upper end of the running piece 8, a passing signal of the cutter 14 traveling sideways together with the running piece 11 is transmitted.

Signals from the proximity switches 26, 27, and 28 are input to a control device 30. The control device 30 automatically releases the clutch of the clutch/brake unit 18 in response to a signal indicating that the guide rolls 5 and 7 have been set to the film cutting preparation position as shown in FIG. 1, or in response to a signal from a manual switch to start film cutting. proximity switches 26 and 27 depending on the film running speed.
In other words, if the film running speed is above a certain initial setting speed, switch 26 is automatically selected, and if it is below that speed, switch 27 is automatically selected, and the selected proximity switch is selected. The coupling of the clutch is controlled by the cutter passing signal, and the brake of the clutch/brake unit 18 is controlled by the cutter position signal of the proximity switch 28.

The reason why the proximity switch, which is the clutch release switch, should be selected is closer to the cutting start position as the film travels faster.The reason is that the faster the film travels, the greater the inertia of the cutter drive system becomes, making it difficult to brake later. Therefore, the purpose is to cancel the traverse drive as early as possible.

In this embodiment, the proximity switches 26 and 27 are automatically selected, but they may be selected manually.

Using the cutter drive device of the present invention having the above configuration, the cutter driving method of the present invention is carried out as follows.

At the start of film cutting, the clutch 18 is driven and connected by an automatic signal or manual operation, and the cutter 14 starts to move laterally by driving from the drive system of the guide roll 7. Since the traveling members such as running pieces that travel sideways with the cutter 14 are made of lightweight materials, the inertia force at the start of traveling is small, and the rotational inertia energy of the heavy guide roll 7 is suddenly transferred to the large-capacity clutch 18 to drive the cutter laterally. Since the force is transmitted, the cutter 14 is rapidly accelerated and rapidly rises to a high speed directly proportional to the rotational speed of the guide roll 7, that is, directly proportional to the film running speed.

The cutter 14, which traverses at a speed corresponding to the film running speed, traverse-cuts the film 1, which is running at high speed, in the width direction from the end. In this traverse cut, the traverse drive of the cutter 14 is taken from the guide roll drive, so the traverse speed of the cutter 14 is proportional to the film running speed, and therefore the cutting angle of the cutter 14 with respect to the running film is It always remains constant even if the running speed changes. Therefore, Katsuta 14
Once the mounting angle is fixed and set to the optimum angle, reliable and stable film cutting can be performed even when the film running speed becomes high.

While performing such good film cutting, the cutter 14 eventually reaches the bottom of the proximity switch. When the film running speed is higher than a certain initial setting speed, the cutter passing signal from the proximity switch 26 is automatically selected, and when the film running speed is lower than that, the cutter passing signal from the proximity switch 27 is automatically selected. Clutch 18 is disengaged via 30.

The cutter 14, whose drive has been released, naturally decelerates to a certain extent due to the resistance of the driving system of the belt 15 and the members traveling with the cutter 14, and reaches the lower part of the proximity switch 28. The brake 18 is activated by the signal from the proximity switch 28, and the cutter 14 is stopped. 14 is controlled. In braking at the traverse end of the cutter 14, the position of the proximity switch 26 or 27 is set so that the inertia of the cutter or the traverse member that is released from driving is attenuated to a sufficiently small value at the position of the proximity switch 28. Moreover, since the transverse member is lightweight and has a small inertial force, the cutter 14 can be easily stopped suddenly.

[Effects of the Invention] As described above, the following effects can be obtained by using the cutter driving method and device of the present invention.

First, the cutter moves sideways at a speed that is directly proportional to the film running speed, and the cutter speed also changes in response to changes in the film running speed, so even if the film running speed is changed, the cutter will always move in relation to the film. It is possible to obtain the optimum cutting angle and stable cutting performance.

Further, since the drive of the cutter is released by the cutter position signal during the cutter traverse stroke, the cutter can be easily stopped suddenly at the end of the cutter traverse stroke, and traverse cutting can be performed at high speed.

As a result, film loss during film cutting can be minimized, and the film can be cut reliably even when the film is running at high speed.

[Brief explanation of the drawing]

FIG. 1 is a side view of a winding section of a film winder to which a cutter drive device according to an embodiment of the present invention is applied;
2 is a plan view of the cutter drive unit of the apparatus shown in FIG. 1, FIG. 3 is a partial front view of the apparatus shown in FIG. 2, and FIG. 4 is a partial vertical sectional view of the apparatus shown in FIG. 1... Film, 2, 2a... Winding core, 5,
7... Guide roll, 6... Arm, 8... Stay, 9... Rail, 10... Roller, 11... Running piece, 13... Holder, 14... Katsuta, 15
... Belt, 16, 17 ... Pulley, 18 ... Clutch/brake unit, 20 ... Bevel gear unit, 26, 27, 28 ... Proximity switch,
30...control device.

Claims (1)

[Claims] 1. The film is traversed over a path longer than the width of the film in the running direction of the continuously running film, and the running film is cut across the entire width of the film in the width direction by the traverse. In a method for driving a cutter of a film winding machine, the cutter is rapidly accelerated from the starting end of the cutter, and then the cutter is driven laterally at a speed equal to the film running speed multiplied by a predetermined constant ratio, and midway through the cutter's traversal path, A method for driving a cutter, characterized in that a driving force transmission path for the cutting cutter is cut off, and the cutter is caused to move laterally on the remaining cutter path using the inertial force at the time of the cutoff. 2. According to claim 1, the cutting position of the driving force transmission path is controlled to such a position that the higher the film running speed is, the longer the remaining cutter traverse path after cutting off the driving force transmission path becomes. How to drive a cutter. 3. In a cutter drive device for a film winder that causes a cutter for cutting a running film in the width direction to travel across a path longer than the film width in the running direction of the film, the film winder's roll drive system and A driving force transmission device is interposed between the cutter traverse drive systems, and the drive force transmission device is provided with a clutch that connects or interrupts the drive force transmission path from the roll drive system to the cutter traverse drive system, and the cutter traverse path is connected to the cutter traverse drive system. A plurality of detectors for detecting passage of a cutter traveling along the route and emitting a detected cutter passage signal are disposed in the extending direction of the traverse route, and a plurality of detectors and the clutch are connected to each other. A cutter drive device, characterized in that the cutter drive device is electrically connected to a control device that issues a cutoff signal to a clutch in response to a cutter passage signal from one of the detectors. 4. In the control device, the cutter passing signal of the one detector for issuing a clutch cutoff signal among the cutter passing signals of the plurality of detectors is located at a position farther from the end of the cutter traverse as the film running speed increases. 4. The cutter drive device according to claim 3, wherein the cutter drive device automatically selects the cutter passage signal of the detector according to the film running speed. 5. The cutter driving device according to claim 3, wherein the detector is a proximity switch.