JP2000118846A - Cutter for web - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cutter for a web capable of properly cutting a web fed at a high speed, with no shock. SOLUTION: A cutter mechanism is provided between front ends of a cutter frame 10 oscillatingly operated. The cutter mechanism has a cutter blade 15 turnable with a pivot 17 as its center. Motive power of a motor 16 provided to the cutter frame 10 is transmitted to the pivot 17 through timing pulleys 21, 22 and a timing belt 23 so as to rotationally drive the cutter blade 15. A control circuit 25 controls a driving rotation number of the motor 16 to cut a web W such that a peripheral speed (a cutting speed) of the cutter blade 15 is equal to the feed speed of the web W or slightly above.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cutter for cutting a web fed at a predetermined speed in a direction crossing a feeding direction. This cutter is applied to a web winding device and a web feeding device.

[0002]

2. Description of the Related Art A cutter of this kind is, for example,
No. 8125 is known. In this case, a cutter blade is fixed to the tip of an arm pivotally supported so as to be pivotable, and the web fed at a predetermined speed is cut at once by pivoting the arm with an air cylinder. 5-1
JP-A-1247 and JP-A-63-101250 disclose a cutter that cuts a web by cutting the web by moving a cutter blade in a direction perpendicular to a web feeding direction by a rodless cylinder. . The latter cutter requires a longer time for cutting than the former swing-cut type cutter.

[0003]

A cutter in which the web is cut at a stroke by the cutter blade which swings and displaces as described above has a speed at which the cutter blade cuts the web (hereinafter, referred to as a cutting speed).
There is a limit to the cutting speed. For this reason, if the web feeding speed is increased and the cutting speed cannot follow the web feeding speed, a large impact is generated at the time of cutting, and the devices that have received the impact are likely to break down. At the time of cutting, an unpleasant cutting noise with explosive sound is also generated. For example, if an air cylinder operating at a higher speed is used, the cutting speed of the cutter blade can be improved. However, as the operating speed of the air cylinder increases, the kinetic inertia of the piston rapidly increases, so this causes a new problem and cannot be followed when the web feeding speed further increases.

When the web is cut at a cutting speed lower than the web feeding speed, the position of the cutting edge is deviated from the web side by an amount corresponding to the delay of the cutting completion timing. Prone to problems.
For example, in the case where the web is wound up with the cut edge fixed to the core, the portion near the cut edge is wound around the core in a folded state, and the subsequent winding layers are successively stepped. Will be attached. This hammered portion causes a defect when a secondary product is formed using the web as a raw material, and must be disposed of, and a considerable length of the web is wasted.

It is an object of the present invention to provide a web cutter capable of cutting a web fed at a high speed appropriately and quietly. An object of the present invention is to always perform appropriate web cutting corresponding to all web feeding speeds even when the web feeding speed is wide, from a web fed at a low speed to a web fed at a high speed. is there. An object of the present invention is to provide a cutter blade that is rotationally driven by motor power, and by controlling the rotational speed of the motor,
The purpose is to always perform web cutting at an appropriate cutting speed. SUMMARY OF THE INVENTION An object of the present invention is to provide a web cutter suitable for application to a web winding device and a web feeding device for web fed at a high speed.

[0006]

In the web cutter of the present invention, a cutter mechanism is set at a standby position, and a web W feeding path is placed between frames 6 opposed to each other with the width of the web W interposed therebetween. The cutter frame 10 that swings between the intersecting cutting positions is arranged. The cutter mechanism includes a turning shaft 17 rotatably supported by the cutter frame 10, a cutter blade 15 supported in parallel with the turning shaft 17 by a bracket 18 fixed to the turning shaft 17, and a turning shaft mounted on the cutter frame 10. The motor 16 includes a motor 16 that drives the cutter blade 15 to rotate via the motor 17 and a control circuit 25 that controls the number of rotations of the motor 16. Thus, the driving speed of the motor 16 is controlled by the control circuit 25 in accordance with the feed speed of the web W, and the peripheral speed of the cutter blade 15 is equal to or slightly higher than the feed speed of the web W. Is used to cut the web.

More specifically, the cutter frame 10 is swingably supported around a swing shaft 11 supported by the frame 6. An operating cylinder 13 for swinging the cutter frame 10 is provided between the cutter frame 10 and the frame 6.
Is provided. The motor 16 and the turning shaft 17 are operatively connected by a positive-type power transmission mechanism. The positive power transmission mechanism means a gear transmission mechanism, a winding transmission mechanism using a timing belt or a chain as a transmission element, and the like.

A cutter mechanism in a standby state and a winding core 4 for the web W are arranged with the web W feeding path interposed therebetween.
An elastically deformable pressing body 20 for pressing the cutting edge 19 of the web W against the winding core 4 is arranged on the outer surface side of the turning surface of the cutter blade 15. This web cutter is applied to a web winding device.

[0009]

The rotary shaft 17 is rotated by the motor 16 to cut the web while rotating the cutter blade 15 around the rotary shaft 17. The peripheral speed of the cutter blade 15 at this time is the same as the web W feeding speed. Alternatively, since it is set slightly larger than this, even when the web W is fed at a high speed, the web W can be appropriately and quietly cut. The control circuit 25 controls the number of rotations of the motor 16 so that the peripheral speed of the cutter blade 15 can be set or changed in accordance with the feed speed of the web W, so that it can flexibly respond to changes in the web feed speed. In addition to this, it is possible to cope with a case where the web feeding speed is increased in the future. As the motor 16 for rotating and driving the cutter blade 15, an inverter motor or a servomotor is preferable because its speed needs to be controlled. However, when a servomotor is used, the position of the cutter blade 15 at the time of web cutting is preferably used. Is preferred in that the

The cutter frame 10 can be configured to be displaceable between a standby position and a cutting position by sliding back and forth or swinging back and forth. However, when the web is cut by swinging the revolving cutter blade 15 with the reciprocating swinging cutter frame 10, the approach speed of the cutter mechanism to the web W is further increased, and the cutter blade 15
Cutting speed can be increased. The reason why the positive power transmission mechanism transmits the motor power to the rotating shaft 17 is to avoid a decrease in the peripheral speed of the cutter blade 15 due to slippage. Further, when the motor 16 is a servomotor, the cutter blade 15 is driven.
This is for properly controlling the position.

According to the web cutter in which the pressing body 20 is provided on the outer surface side of the turning surface of the cutter blade 15, the cutter blade 1
5, while simultaneously cutting the web W,
Circumscribes the web W and presses the cut edge 19 against the core 4, so that the web W can be cut and wound easily while continuously feeding the web W. The reason why the pressing body 20 is configured to be elastically deformable is to press the cutting edge 19 more reliably against the core 4 so that the cutting edge 19 is accurately wound.

[0012]

1 to 4 show an embodiment in which the web cutter of the present invention is applied to a web winding device. In FIG. 2, reference numeral 1 denotes a turret plate constituting the web winding device. The turret machine 1 winds, for example, the coated or laminated web W continuously into a roll, and when the roll diameter reaches a predetermined value, the turret arm 2 is rotated by 180 degrees around the axis 3. Then, after the positions of the new core 4 and the web roll R are exchanged, the web W is cut with a web cutter to remove the core 4.
Wrap around. A web cutter is arranged near the empty core 4 above the web feed path.

The web cutter is provided between the frames 6 opposed to each other with the width of the web W therebetween. The frame 6 can swing up and down around a shaft 7 and is swingably operated by an air cylinder 8 between a use position indicated by a solid line in FIG. 2 and a standby position indicated by an imaginary line in FIG. In order to prevent the web W from interfering with the web cutter at the use position, a guide roller 9 which is freely rotatable is provided on the swinging tip side of the frame 6.

The web cutter includes a pair of cutter frames 10 provided between the frames 6, a standby position supported by the cutter frames 10 and indicated by a solid line in FIG. 1, and a cutting position intersecting the web W feeding path. (The state shown by the imaginary line in FIG. 1).

One end of the cutter frame 10 is supported by a swing shaft 11 pivotally supported by the frame 6 so as to be vertically swingable. The cutter frame 10 is provided between the frame 6 and a base arm 12 of the cutter frame 10. The operation cylinder 13 switches between a standby position and a cutting position. The guide roller 9 is rotatably supported by using a swing shaft 11. The operation cylinder 13 is composed of an air cylinder.

The cutter mechanism comprises a cutter blade 15, a motor 16 for driving the cutter blade 15 to rotate, a positive power transmission mechanism for transmitting the power of the motor to the rotating shaft 17, and the like. The revolving shaft 17 is arranged near the swinging tip of the cutter frame 10 in a direction perpendicular to the web feeding direction, and each of its shaft ends is rotatably supported by the cutter frame 10.
A plurality of brackets 18 are fixed to the revolving shaft 17, and the brackets 18 support the cutter blade 15 so as to be parallel to the revolving shaft 17 and to have a blade cross section inclined upward toward the cutting edge 15a.

The reason why the cutter blade 15 is inclined in this way is to press the cutter blade 15 at a right angle against the web W at the time of cutting the web as shown in FIG. On the outer surface side of the turning surface of the cutter blade 15, a cutting edge 19 of the web W is provided.
Is provided on the winding core 4. The pressing body 20 is composed of a group of elastically deformable bristles, and is disposed over the entire length of the cutter blade 15 in the width direction. In FIG. 1, reference numeral 30 denotes a safety cover.

The motor 16 comprises a servomotor and is fixed on a table provided on one of the cutter frames 10. In order to transmit the power of the motor 16 to the turning shaft 17 without slipping, a positive power transmission mechanism is provided. Specifically, the timing pulleys 21 and 22 are fixed to the output shaft of the motor 16 and the turning shaft 17, respectively.
The power transmission mechanism is configured by winding the timing belt 23 around the power transmission mechanism. A control circuit 25 is provided to control the number of rotations of the motor 16 in accordance with the web W feeding speed. In FIG. 2, reference numeral 26 denotes a speed sensor that detects the web W feeding speed and outputs a detection signal to the control circuit 25.

Next, the operation of the web cutter will be described.
As shown in FIG. 2, immediately after the positions of the web roll R and the new core 4 are exchanged, the frame 6 is swung downward by the air cylinder 8 toward the use position. Along with this,
The guide roller 9 presses down the web W to bring the feeding path of the web W close to just above the core 4 so as to maintain a cuttable state. At this time, the cutter frame 10 is held at the standby position.

When the frame 6 swings to the use position,
For example, the motor 16 is detected by a microswitch, and the control circuit 25 issues a start command signal to start the motor 16 based on the detection signal. At this time, the driving speed of the motor 16 is calculated and set by the control circuit 25 so that the peripheral speed of the cutter blade 15 is equal to or slightly higher than the web feeding speed detected by the speed sensor 26. In this state, the cutter rod 10 is pivoted downward by retracting the piston rod 13a of the operation cylinder 13 to pivot the cutter mechanism to the cutting position.

The control circuit 25 includes a motor (servo motor)
The position (phase) information of the rotating cutter blade 15 can be known by receiving the feedback signal from the control unit 16. Based on this position information and the time required for the cutter mechanism to swing from the standby position to the cutting position, it is appropriate to bring the cutting edge 15a of the cutter blade 15 into contact with the web W.
The operation start timing of the operation cylinder 13 can be calculated backward. The control circuit 25 transmits the appropriate timing signal to a solenoid valve (not shown) for the operation cylinder 13.
And the operation cylinder 13 is operated at a perfect timing. Therefore, as shown in FIG. 3, the cutter blade 15 can cut the web W in an appropriate posture such that the cutter blade 15 is orthogonal to the web W, or the cutting edge 15a is inclined downward in the web W feeding direction. Since the cutting speed at this time is higher than the web feeding speed, the cutting can be performed quietly without generating any impact or cutting noise accompanying the cutting.

The cutting edge 19 of the web W cut by the cutter blade 15 is pressed simultaneously with the pressing body 20 as shown in FIG.
Is pressed against the peripheral surface of the core 4 and is adhered to the double-sided tape 27 that has been attached to the core 4 in advance. Double-sided tape 27
Are attached to the winding core 4 in a circular shape. Further, since the core 4 is driven to rotate prior to the cutting of the cutter blade 15, the web W adhered to the core 4 is immediately wound around the core. Therefore, it is possible to prevent the vicinity of the cutting edge 19 from being caught in a folded state.

As described above, when the web W is ready to be wound around the new core 4, the air cylinder 8 is operated to return the entire frame 6 to the standby position, and the motor 16 is stopped. Further, the operating cylinder 13 is operated to return the cutter frame 10 to the standby position, in preparation for the next web cutting.

In the web feeding device, the web is cut when the remaining amount of the web roll from which the web W has been fed becomes small, and the cut end is adhered to the peripheral surface of a new web roll. Although W is supplied continuously, the web cutter of the present invention can be applied to this type of web feeding device.

The cutter frame 10 is slidably supported by a guide provided on the frame 6 and can be displaced by a control cylinder 13 between a standby position and a cutting position. The operation cylinder 13 and the air cylinder 8 for the frame 6 may be replaced with a hydraulic cylinder. The cutting edge 15a of the cutter blade 15 can be formed in a saw blade shape.
As the motor 16, an inverter motor other than the servo motor can be applied. The turning shaft 17 can be directly driven to rotate by a motor 16. The pressing body 20 can be formed of elastically deformable rubber or foam. As the transmission mechanism, a power transmission mechanism using a chain or a gear as a transmission medium can be applied.

[0026]

According to the present invention, the cutting of the web W is performed by using the cutter blade 15 which is rotated by the motor 16 so that the peripheral speed of the cutter blade 15 is equal to or slightly higher than the web feeding speed. Can be done. Therefore, even when the web W is fed at a high speed, the cutting speed by the cutter blade 15 can easily follow the web feeding speed, and therefore, the web W can always be cut properly and quietly. Even when the feed speed of the web W varies over a wide range, the cutting speed of the cutter blade 15 can be optimized without any excess or shortage in accordance with any web feed speed.

[Brief description of the drawings]

FIG. 1 is a side view of a cutter mechanism.

FIG. 2 is a side view of the web winding device.

FIG. 3 is a side view of the cutter mechanism at the time of web cutting.

FIG. 4 is a side view showing a relationship between a web cutting edge and a core.

[Explanation of symbols]

 6 Frame 10 Cutter frame 11 Oscillating shaft 13 Operating cylinder 15 Cutter blade 16 Motor 17 Rotating shaft 18 Bracket 25 Control circuit W Web

Claims (3)

[Claims] 1. A cutter for reciprocating a cutter mechanism between a standby position and a cutting position intersecting with a feeding path of the web W between frames 6 opposed to each other with a width region of the web W therebetween. A rotating shaft 17 rotatably supported by the cutter frame 10, a cutter blade 15 supported in parallel with the rotating shaft 17 by a bracket 18 fixed to the rotating shaft 17,
A motor 16 mounted on the cutter frame 10 and configured to rotationally drive the cutter blade 15 via the turning shaft 17;
And a control circuit 25 for controlling the number of drive rotations of the motor 6. The control circuit 25 controls the number of drive rotations of the motor 16 in accordance with the feed speed of the web W. A web cutter set to cut the web at the same or slightly higher feed speed. 2. A cutter frame 10 is swingably supported around a swing shaft 11 pivotally supported by the frame 6, and the cutter frame 10 is swung between the cutter frame 10 and the frame 6. The web cutter according to claim 1, further comprising an operation cylinder (13), wherein the motor (16) and the turning shaft (17) are operably connected to each other by a positive power transmission mechanism. 3. A cutter mechanism in a standby state and a winding core 4 for the web W are disposed with a web W feeding path interposed therebetween, and a web W is provided on the outer surface side of the turning surface of the cutter blade 15. 3. A web cutter according to claim 1, further comprising an elastically deformable pressing member for pressing the cutting edge of the cutting member against the core.