JP5932702B2 - Web cutting device - Google Patents

Description

  The present invention relates to a web cutting device.

  Conventionally, when feeding a long web such as a plastic sheet or winding the web that is sent, the device that cuts the web after feeding or after winding without stopping the line from the subsequent web Are used (Patent Documents 1 to 4).

(Patent Document 1)
In Patent Document 1, the change when the turret switches the roll to which the web is supplied is a dancer between the new shaft, that is, the new winding shaft before winding the web, and the old shaft, that is, the fully wound shaft that has already been wound on the web. It is shown that by providing a roll, the speed of the old shaft is controlled by the displacement of the dancer roll to stabilize the tension. The web cutting apparatus disclosed in Patent Document 1 cuts a cutting blade down at a right angle or higher with respect to the flow of a sheet (web).
However, if the flowing sheet is cut from a right angle with a cutting blade, the sheet side wound around the new shaft will be obstructed from reaching the cutting blade. The attached state becomes worse. When the winding state is deteriorated, the sheet wound after that is affected, and the quality of winding is deteriorated. If the line speed, i.e., the sheet flow, is increased, the above symptoms tend to get worse.

(Patent Document 2)
Japanese Patent Application Laid-Open No. H10-228667 discloses a technique in which a contact roll performs near-winding, which is a system in which a contact roll winds around a roll on the shaft surface with a gap between the new shaft and the old shaft when the winding shaft of the turret is switched. The web cutting in Patent Document 2 is a traveling type in which the cutting blade moves up and down at the time of cutting and cuts across the sheet from the horizontal and vertical direction of the sheet.
In the cutting apparatus of Patent Document 2, since the cutting blade cuts across the sheet, the cutting surface is inclined, and it is necessary to preliminarily apply an adhesive tape, glue, or the like to the new shaft during winding. Although it is possible to wind only with the wrapping air without using an adhesive tape or the like, the winding surface is deteriorated because the cut surface is slanted, and the winding quality is deteriorated as in the apparatus shown in Patent Document 1.

(Patent Document 3)
As for the apparatus disclosed in Patent Document 3, the sheet flow is not stopped continuously without stopping the sheet on the premise that the flow of the sheet is temporarily stopped at the time of rewinding, but this apparatus also automatically cuts the sheet. A cutting device is provided.
The cutting device of Patent Document 3 employs a cutting method by shearing, that is, shear cutting, between a fixed blade and a vertically movable blade. In this cutting method, in order to cut continuously flowing sheets, unless the fixed blade and the vertically movable blade are moved in the sheet flow direction, the cut sheet completely loses its place and becomes clogged. In addition, since cutting requires two blades, a rotary blade and a movable blade, the apparatus is complicated and requires adjustment.

In particular, in each of the cutting devices disclosed in Patent Documents 1 to 3, the working radius of the blade swung down on the web when cutting the web is relatively large, and the cutting position of the web from the state in which the cutting blade is greatly shaken. Requires a big move up to.
For example, for each of the cutting devices disclosed in Patent Documents 1 to 3, the distance between the operating fulcrum of the cutting blade and the tip of the blade is the maximum winding diameter of the web in the winding portion around which the web is wound. If you compare it, you can understand its size.
That is, in the apparatus of FIG. 1 of Patent Document 1, the distance between the cutting edge of the cutting blade 19 and the fulcrum a is much larger than the maximum winding diameter of the web on the full winding shaft 2. . Moreover, in the apparatus of FIG. 1 of Patent Document 2, the distance between the cutting edge of the cutting blade 4 and the cutting device 5 provided at the base end of the member that supports the cutting blade 5 is the full winding roller on the winding shaft b. The diameter reaches almost the same as the diameter of R and cannot be said to be smaller than the full-roller roller R. Furthermore, in the apparatus of FIG. 1 of Patent Document 3, the distance between the cutting edge of the moving blade 9 and the fulcrum on the base end side of the member that supports the moving blade 9 in the cutting apparatus D is much larger than the maximum diameter of the winding roll 10. Big. This can also be grasped from the installation position of the terminal pressing roller 13 of the winding roll 10 (two-dot chain line).

(Patent Document 4)
On the other hand, in the cutting device shown in the web connecting device of Patent Document 4, a cutting blade (blade portion 32a) which is a single blade is provided in the rotor (second cutter 32). This cutting device is a so-called rotary cutter that rotates the cutting blade by the rotation of the rotor. In the rotary cutter found in Patent Document 4, as can be seen from FIG. 1, the distance between the tip of the blade 32a of the second cutter 32 and the center of the second cutter 32, which is the center of rotation of the blade 32a, is It is much smaller than the radius of the new roll 17 that is a full roll.
Thus, the rotary cutter found in Patent Document 4 is a completely different type of cutting device from Patent Documents 1 to 3, that is, a completely different cutting device in the technical field.
In particular, in the apparatus of Patent Document 4, the web is not cut by swinging the cutting blade downward into the air, but is hung on the backup roll 31 provided separately from the rotary cutter, that is, the rotor, and is placed on the surface of the backup roll 31. The blade of the rotary cutter (second cutter 32) is rotated by the rotation of the rotor toward the web w along which it is cut.

JP 2010-13197 A JP 2010-168128 A Japanese Patent No. 3375308 Japanese Patent No. 3939043

However, in the cutting of the web using the rotary cutter of Patent Document 4, it was impossible to clean the web, and it was not possible to wipe out the fear that uncut portions would be left.
The inventor of the present invention, while investigating the cause of the uncut portion, in the cutting apparatus using the rotary cutter shown in Patent Document 4, the web is formed separately from the rotor that rotates the cutting blade and Attention was paid to the point that the cutting blade was applied to the surface of the backup roll 31 only by the rotation operation, spanning the surface of the backup roll 31 rotating independently of the rotor.
And this invention makes it possible to cut off the old and new webs cleanly without breaking the above technical common sense of the rotary cutter, and to solve the above problems of the rotary cutter of Patent Document 4. is there.

The present invention comprises a feeding device for feeding a long web from the upstream side to the downstream side, a rotor disposed in the middle of the web feeding path by the feeding device, and a cutting blade provided on the rotor, The rotor includes a contact portion that comes into contact with the web on an outer peripheral portion thereof, and changes a direction of the feeding path of the web by contact between the contact portion and the web. During rotation of the rotor And at least one of the contact portion and the cutting blade makes a relative movement in the radial direction of the rotor, and the relative movement causes at least the rotation direction of the cutting blade in the contact portion. than the contact portion or before the contact portion located on the front side of the rotation direction after positioned behind, in a state where the cutting blade is protruded radially, which said web is cut, Peripheral speed of the cutting blade tips of serial rotor, providing the web cutting apparatus in which the projection of the cutting blade by the relative movement at the stage of faster than web feeding speed is made.
In the present invention, a feeding device for feeding a long web from the upstream side to the downstream side, a rotor arranged in the middle of the web feeding path by the feeding device, and a cutting blade provided on the rotor The rotor includes a contact portion that contacts the web on an outer peripheral portion thereof, and changes a direction of the feeding path of the web by contact between the contact portion and the web, and rotation of the rotor And at least one of the contact portion and the cutting blade makes a relative movement in a radial direction of the rotor, and rotation of at least the cutting blade of the contact portion by the relative movement. The web is cut in a state where the cutting blade protrudes in the radial direction from the rear contact portion located on the rear side in the direction or the front contact portion located on the front side in the rotational direction. There, the contact portion is a plurality of contact rollers disposed on the outer periphery of the rotor, the contact roller provides a web cutting device is intended to rotate or freely own rotation.
Furthermore, in this invention, at least any one of the rear contact roller located in the back side of the rotation direction of the said cutting blade among the said contact rollers, and the front contact roller located in the front side of the said rotation direction is a radius of the said rotor. A web cutting apparatus that moves in a direction is provided.
Still further, the present invention provides a web cutting apparatus in which the rotor rotates while contacting the web, and the cutting blade projects by the relative movement during the rotation .
Also, in the present invention, to provide a web cutting device the cutting blade is moved in a radial direction of the rotor.

In the present invention, as described above, the rotor provided with the cutting blade and rotating the cutting blade is provided with a contact portion with the web, and the web in which the direction of the feed path is changed by the rotor itself by the contact portion, During rotation of the rotor, at least one of the contact portion and the cutting blade relatively moves in the radial direction of the rotor, and the relative movement causes the contact portion to be positioned at least on the rear side in the rotation direction of the cutting blade. The web can be cut by projecting the cutting blade in the radial direction from the rear contact portion or the front contact portion located on the front side in the rotational direction. As a result, the present invention can provide an apparatus in which the above-mentioned uncut residue hardly occurs.
In particular, when the rotational peripheral speed at the tip of the cutting blade of the rotor becomes faster than the feeding speed of the web, the cutting blade is projected by the relative movement, so that the web can be cut cleanly. it can.
Moreover, in this invention, a contact part suppresses the tension | tensile_strength applied to the web which contacts, and prevents the conveyance of a smooth web from being disturbed by rotation of a rotor.

The schematic side view which shows the use condition of one Embodiment of the web cutting device which concerns on this invention. (A) is an enlarged side view of the main part of the web cutting device of FIG. 1 (A), (B) is an explanatory view of the main part of the rotor provided in the web cutting device of (A), and (C) is the web cutting of (A). The principal part explanatory drawing which abbreviate | omitted the blade part of the rotor with which an apparatus is equipped, (D) is a partially notched top view of the cutting blade provided in the rotor of (C). (A)-(G) is a schematic side view which shows the direction of the cutting blade in each position of the circumferential direction of a rotor, respectively. (A) is a schematic side view showing another embodiment of the rotor, (B) is a schematic side view showing a state in which the cutting edge of (A) protrudes the cutting blade, and (C) is a cutting device. Furthermore, the schematic side view which shows the use condition of other embodiment.

Hereinafter, preferred embodiments of a cutting apparatus according to the present invention will be described with reference to the drawings.
(overall structure)
This web cutting device performs cutting while continuously feeding a plastic long web. As shown in FIG. 1, a base (not shown), a web w feeding device, and a cutter unit. 2, a guide unit 3, a winding detection sensor (not shown), a contact detection sensor (not shown), and a control unit (not shown).
In this example, the web cutting device is implemented in a winder that continuously winds the web w, and performs web cutting when the old and new webs are connected.

(Substrate)
The base supports the feeding device, the cutter unit 2, and the guide unit 3.

(Feeding device)
The above feeding device feeds a long web from the upstream side to the downstream side. In the example of the winder, the feeding device also serves as the winding portion of the web w.
Specifically, the winder includes a turret 10, a plurality of the winding portions provided in the turret 10, and a guide roll 13. The winding portion is a winding shaft (winding shafts 11 and 12) of the web w, and two turrets 10 are provided in this example.
The turret 10 is a position switching device for the winding shafts 11 and 12 that employs a well-known configuration. In the turret 10, one of the winding shafts 11 and 12 is disposed at a web winding position, and the other one of the winding shafts 11 and 12 is disposed at an exchange position away from the winding position. In FIG. 1, the web winding position is the left end of the turret 10, and the web replacement position is the right end of the turret 10. The turret 10 can change the arrangement of the two winding shafts 11 and 12 by rotating.

In FIG. 1, a fully wound shaft, that is, a web winding shaft 12 (hereinafter referred to as an old shaft 12 if necessary) is moved to the above-described replacement position by the turret 10, and the winding shaft before the web winding is replaced. 11 (hereinafter referred to as a new shaft 11 if necessary) shows a state immediately after the transition to the winding position. In the state shown in FIG. 1, the new shaft 11 newly disposed at the winding position starts winding the web w in place of the old shaft 12 that was previously at the winding position, and is disposed at the replacement position. The old shaft 12 is then replaced with another winding shaft that is ready for web winding.
At least in the state of being disposed at the winding position, the new shaft 11 rotates by obtaining a driving force from a power source (not shown) such as an electric motor. In this example, the new shaft 11 and the old shaft 12 are each directly connected to a power source such as an electric motor and rotate. In addition, the new shaft 11 and the old shaft 12 can also be implemented as receiving a rotational force from a power source such as an electric motor through known power transmission means such as gears, pulleys, and belts. In addition, the winding shaft can be implemented only when it is arranged as the new shaft 11 at the cutting position and connected to a power source or a power transmission medium and receives a rotational force from the power source.
The guide roll 13 is disposed in a web w conveyance section between the new shaft 11 at the winding position and the old shaft 12 at the replacement position. The guide roll 13 is configured to guide the conveyance of the web w in the section by setting the section of the web w. As shown in FIG. 1, the guide rolls 13 are provided at two locations on the turret 10 corresponding to the above replacement of the old and new shafts 11 and 12.
In this example, the turret 10 is provided with the two winding shafts 11 and 12. However, the turret 10 may be provided with three or more winding shafts.

(Cutter part 2)
The cutter unit 2 cuts the web w between the new shaft 11 at the winding position and the guide roll 13 on which the web w is hung on the web w conveyance line, that is, the web w conveyance path.
Specifically, the cutter unit 2 includes a rotary cutter 20, a winding roll 21, a motor 22 that rotates the rotary cutter 20, an arm 23, and an arm drive unit 24 that rotates the arm 23.

(Rotary cutter 20)
As shown in FIGS. 2A, 2B, and 2C, the rotary cutter 20 includes a rotor 25 that rotates by receiving a driving force from the motor 22, a cutting blade 26 provided on each rotor 25, and a blade cutter. A portion 27, a contact portion 28, and an air blowing portion 29 are provided.

(Rotor 25)
The rotor 25 can rotate by receiving power transmitted from the motor 22 by known power transmission means such as a belt, a pulley, or a gear (FIG. 1). In this example, a pulley is provided for each of the rotor 25 and the motor 22, and a belt is applied to both the pulleys so that power is transmitted from the motor 22 to the rotor 25.
In this example, the rotor 25 is formed in a short columnar shape, and rotates with the central axis x of the column as a rotation axis. The motor 22 for driving the rotor 25 is a gear motor controlled by an inverter in this example.
By the rotation of the rotor 25, the cutting blade 26 can be rotated around the central axis x of the rotor 25.

Under the control of the control unit, the rotor 25 does not rotate when it is in the retracted position where the web w is not cut, but rotates when it moves to the standby position for cutting the web w. When the cutting of the web w is completed by the control of the control unit, the rotation is stopped. Also, the rotor 25 is returned to the retracted position after the cutting of the web w is completed under the control of the control unit. The position of the rotor 25 is controlled by controlling the arm driving unit 24 by a control unit, which will be described later.
Under the control of the control unit, the rotor 25 can rotate at a speed faster than the feed speed of the web w, that is, the transport speed of the web w, at least when the web is cut, by the control of the inverter. The rotational speed of the rotor 25 is preferably 150 to 250% of the conveyance speed of the web w. In particular, the rotation speed of the rotor 25 is preferably set to a speed of 150 to 200% of the conveyance speed of the web w. However, the rotor 25 may be rotated at a speed outside the range as long as the web w can be cut cleanly.

The rotor 25 may reach the rotation speed faster than the conveyance speed of the web w, which is suitable for cutting the web w, in the first rotation, or may be implemented even after reaching a plurality of rotations. it can. In this example, the rotation speed of the rotor 25 is set to reach 150 to 250% of the conveyance speed of the web w at the second rotation. That is, in this example, the cutting blade 26 provided in the rotor 25 reaches the rotational peripheral speed of 150 to 250% of the conveyance speed of the web w in the second round. In this way, cutting the web w in the second round of the cutting blade 26 can reasonably reach the speed suitable for the cutting, and further shortening the time required for cutting, preferable. In particular, the higher the conveyance speed of the web w, the more difficult it is to reach 150% to 250% of the web w conveyance speed at the first rotation of the rotor 25. Therefore, the cutting after the second rotation of the rotor 25 is possible. It is valid. Of course, the cutting blade 26 may be rotated at least three rounds to reach the speed suitable for the above-described web w cutting. However, in consideration of the general web w conveyance speed, the above speed can be reached sufficiently with two rounds. The web w cutting in the second round of the cutting blade 26 is preferable in terms of time reduction as described above.
In addition, it is preferable to set the rotation speed of the rotor 25 at the second rotation so as to reach the above-mentioned 150 to 200% of the conveyance speed of the web w, which is optimal for cutting.

(Cutting blade 26)
The cutting blade 26 is a single blade that protrudes from the outer peripheral surface of the rotor 25 and cuts the web w. As shown in FIG. 2D, the cutting edge 26 a of the cutting blade 26 is a saw blade provided with triangular peaks and valleys alternately along the axial direction of the rotor 25. In FIG. 2D, a indicates the top of the cutting edge 26a, that is, the top of the peak, and b indicates the base of the cutting edge 26a, that is, the valley.
The cutting blade 26 is arranged in the middle of the conveyance path of the web w to cut the web w. By moving the cutting blade 26 in the same direction as the conveyance direction of the web w, the cutting stroke of the web w in the cutting blade 26 can be made as small as possible.
In this example, the cutting blade 26 is provided on the rotor 25 via the blade protrusion 27, and the cutting blade 26 is in a state in which the cutting edge 26a protrudes from the outer peripheral surface of the rotor 25 at least when the web w is cut. Perform the above cutting of w.
The distance between the tip of the cutting blade 26, that is, the cutting edge 26 a and the rotation center of the rotor 25 is the maximum winding diameter of the web w on the winding shaft (old shaft 12) that is the winding portion, that is, the roll diameter of the web w of the full winding shaft. It is preferable to make it smaller. More preferably, the distance between the cutting edge 26a of the cutting blade 26 and the rotation center of the rotor 25 is set to be larger than the maximum winding radius of the web w on the winding shaft (old shaft 12), that is, the roll radius of the web w of the full winding shaft. It shall be small.

As described above, when the web w is hung on the contact portion 28 on the outer periphery of the rotor 25, the conveyance path of the web w includes an arc-shaped section along the outer peripheral surface of the rotor 25.
That is, unlike the cutting apparatus using the conventional rotary cutter found in Patent Document 4 or the like, the cutting blade 26 is located at the center of the arc in the arc section of the web w conveyance path when the web w is cut. Circulate as the center. Then, the cutting blade 26 cuts the web w as shown in FIG. 3 (G) by projecting the blade edge 26a from the inside of the arc to the radially outward direction by the cutting portion 27. I do.
In this way, the cutting blade 26 is first rotated along the arc of the web w, and when the cutting blade 26 reaches a rotational speed suitable for the above-described cutting, that is, the rotational peripheral speed, the cutting edge 27 performs the above operation. By cutting the web w by projecting the blade edge 26a from the inside of the arc in the radially outward direction of the arc, the cutting blade 26 is wider than the width of the apex a from the base b of the blade edge 26a. The web w can be cut with a slightly large stroke.
Since the cutting blade 26 moves at a higher speed than the conveying speed of the web w and overtakes the web w, the cutting edge 26a protrudes toward the web w as described above, so that the cutting of the web w can be completed cleanly without being missed. it can.

In the above description, the cutting blade 26 is turned around the arc center of the arc-shaped section of the web w conveyance path. On the other hand, the cutting blade 26 may be any one that circulates inside the arc shape and reaches an appropriate rotation speed so as to project outward in the diameter direction of the circumference and apply the cutting edge 26a to the web w from the inside of the arc. The rotation of the cutting blade 26 is not limited to that performed around the arc center of the arc-shaped section of the web w conveyance path. In other words, the cutting blade 26 passes the web w with the moving direction of the cutting blade 26 substantially aligned with the direction in which the conveyance path of the web w curved by contact with the rotor 25 extends, while passing inside the curved conveyance section (inside diameter). ) To the outside of the curved section, the web w may be cut by moving the cutting blade 26.
However, from the viewpoint of suppressing the movement amount of the cutting blade 26 in the inner and outer directions of the circumference diameter, and further, from the viewpoint of cutting while passing the web w by moving the cutting blade 26 at a speed faster than the conveying speed of the web w. It is desirable that the direction of movement of the web w and the direction of rotation of the cutting blade 26 be matched as much as possible. As described above, the rotation of the cutting blade 26 is centered on the arc center of the arc-shaped section of the web w conveyance path. It is best to do.
When the circumferential speed of the cutting blade 26 is set higher than the conveying speed of the web w as described above, the conveyance section of the web w to which the cutting blade 26 can be applied is extremely limited. For example, the rotary cutter disclosed in Patent Document 4 is designed to hit the blade tip at a pinpoint from the outside of the backup roll separate from the rotor to the inside of the arc, so that the cutting blade is faster than the conveyance of the web w. The control to hit is extremely difficult. In the apparatus of Patent Document 4, the blade is rotated from the outer side of the arc section of the web conveyance path toward the arc of the conveyance path so that the blade intersects the arc, so that the blade can be set up on the web w. This is because a possible section is a point.
In this regard, in the present invention, as described above, the cutting edge 26a circulates along the circumferential direction of the arc inside the arc that is the outer peripheral surface of the rotor 25, and the web w The section that can be cut is not a point but a width as an arc length.

(Blade 27)
The blade protruding portion 27 is a mechanism that enables the cutting blade 26 to protrude and retract from the rotor 25. That is, the blade portion 27 moves the cutting blade 26 in the radial direction of the rotor 25.
In this example, since the cutting edge 27 cuts the web w in the second round of the cutting blade 26, the cutting edge 26 of the cutting blade 26 is moved around the outer periphery of the rotor 25, that is, the contact portion 28 in the first round of the cutting blade 26. The blade is immersed so as not to protrude further, and the cutting blade 26 is protruded from the contact portion 28 in the radially outward direction of the rotor 25 in the second round.
In this example, the cutting edge 27 changes the direction of the cutting edge 26a of the cutting blade 26 with respect to the rotor 25, that is, the angle of the cutting blade 26 with respect to the rotor 25, so that the cutting blade 26 protrudes and protrudes from the outer peripheral surface of the rotor 25 as described above. Let

  The conventional cutting devices represented by Patent Documents 1 to 3 operate the cutting blade in a direction perpendicular to the conveying direction of the web w, and the conventional cutting device is similar to the cutting blade 26 according to the present invention. If the saw blade-shaped cutting blade is used, the web w is cut by passing the web w between the top part a and the base part b of the cutting edge 26a. In this case, the web w made of an easily stretchable material requires a larger amount of movement of the blade edge 26a, that is, a larger movement width. It is not uncommon for such a movement width to be 150 to 200 mm in the normal cutting of the web w. For this reason, it is necessary to move the cutting blade at a higher speed for such a large movement width so as not to disturb the conveyance of the web w.

On the other hand, in the apparatus according to the present invention, the cutting blade 26 circulates at a speed faster than the flow of the web w being conveyed, and therefore, between the top portion a and the base portion b of the cutting edge 26a of the cutting blade 26 in the circulatory direction. If the cutting blade 26 is displaced outward in the radial direction of the diameter of the circumference by a short distance slightly exceeding the width, the web w can be reliably cut. For example, when the radius r1 of the rotor 25 shown in FIG. 2 (C) is 47.5 mm, the base w of the blade edge 26a is arranged at a position where the circular radius r2 of the base b is 48.5 mm. Can be cut reliably. That is, with respect to the radial direction of the circumference, the web w has a slight operating width of the cutting blade 26 of (top a−base b) + (48.5 mm−47.5 mm) = (top a−base b) +1 mm. A clean cut can be made.
In this example, by changing the direction of the cutting edge 26a of the cutting blade 26 within a range of about 20 degrees by the blade protruding portion 27, the cutting blade 26 is caused to appear and disappear from the outer peripheral surface of the rotor 25 with the above operating width. It is.
However, the direction of the blade edge 26a may be changed to an angle outside the above range as long as the web w can be cut reliably.

The bladed portion 27 will be described more specifically.
The blade protruding portion 27 includes a cam follower 27a to which the cutting blade 26 is attached and a cam plate 25c provided with a groove cam 27b.
The cam plate 25 c is a disk provided concentrically with the rotating shaft of the rotor 25. The cam plate 25c is attached to a rotation shaft of the rotor 25 via a bearing (not shown) such as a bearing and can rotate relative to the rotor 25. The cam plate 25c is also provided with a pulley. The motor 22 is provided with a sub pulley that transmits power to the cam plate 25 c together with the pulley that transmits power to the rotor 25. A sub belt is hung between the sub pulley and the pulley of the cam plate 25c, and power is transmitted from the motor 22 to the cam plate 25c.
The base end of the cam follower 27a is pivotally supported with respect to the rotor 25 by a shaft serving as a pivot for rotation (hereinafter, a pivot fulcrum shaft 27c). By rotating the cam follower 25 around the turning fulcrum shaft 27 c, the direction of the cutting edge 26 a of the cutting blade 26 can be changed, and the cutting edge 26 a can be moved in and out of the rotor 25. The cam follower 27a and the groove cam 27b may adopt a known structure.

Specifically, the groove cam 27b of the cam plate 25c is an annular groove. The groove cam 27b has a different distance from the center of the rotor 25 in the groove depending on the position. Guided by the groove cam 27b, the cam follower 25a can change the direction of the cutting edge of the cutting blade 26 relative to the rotor 25 within the above range. In order to smoothly follow the groove cam 27b, the cam follower 27a includes a rotatable free roller 27d at a portion that directly contacts the groove cam 27b.
In this example, the groove cam 27b is provided so as to make a half rotation with respect to one rotation of the cutting blade 26, that is, one rotation of the rotor 25. Specifically, the diameter of each pulley is set so that the pulley ratio becomes 1/2 between the pulley of the motor 22 and the sub pulley, or between the pulley of the rotor 25 and the cam plate 25c. That's fine.
By setting the pulley ratio, the groove cam 27b can draw a locus corresponding to two rotations of the rotor 25, that is, two rounds of the cutting blade 27, by one rotation of the groove cam 27b.

FIG. 3 shows the rotation of the rotor 25 and the transition of the cam follower 27a accompanying the rotation in the above example. As shown in FIG. 3B, when the cutting blade 26 rotates 72 degrees from the state before the start of rotation in FIG. 3A, the groove cam 27b rotates 36 degrees from the state in FIG. Further, as shown in FIG. 3C, when the cutting blade 26 rotates 169 degrees from the state of FIG. 3A, the groove cam 27b rotates 79.5 degrees from the state of FIG. As shown in FIG. 3D, when the cutting blade 26 rotates 294 degrees from the state of FIG. 3A, the groove cam 27b rotates 147 degrees from the state of FIG. Further, as shown in FIG. 3 (E), when the cutting blade 26 rotates 360 degrees (one turn) from the state of FIG. 3 (A), the groove cam 27b rotates 180 degrees (half rotation) from the state of FIG. 3 (A). doing. Further, as shown in FIG. 3 (F), when the cutting blade 26 rotates 411 degrees from the state of FIG. 3 (A), the groove cam 27b rotates 206.5 degrees from the state of FIG. 3 (A). Further, as shown in FIG. 3 (G), when the cutting blade 26 is rotated 484 degrees from the state of FIG. 3 (A), the groove cam 27b is rotated 242 degrees from the state of FIG. 3 (A). In such a transition, as shown in FIG. 3 (G), the groove cam 27b reaches the outer edge of the rotor 25 in the radial direction of the rotor 25 in the radial direction of the rotor 25 on the second turn of the cutting blade 26. The cutting edge is protruded to cut the web w.
In each figure of FIG. 3, the white arrow indicates the direction of rotation of the roll, and the black arrow indicates the direction of rotation of the roll that rotates in response to the rotation of another roll.
The groove cam 27b described above is an example, and the cutting edge portion 27 can be constituted by a cam other than the groove cam.
Since the cutting blade 26 cuts the web w by the two-stage operation of the above-described rotating operation by the rotor 25 and the protruding operation of the cutting edge 26a to the outside by the blade portion 27, the patent document The web w can be cut more reliably as compared with the case where the web is cut only by the rotating operation like the rotary cutter 4. In addition, this apparatus cuts the web w by causing the cutting blade 26 to protrude into the air, and can cut the web w without using a receiving blade that receives the cutting blade 26 or a backup roll.

(Contact part 28)
The contact portion 28 changes the direction of the feeding path of the web w, that is, the direction of conveyance of the web w by contacting the web w.
Specifically, the contact portion 28 is provided on the outer peripheral surface of the rotor 25 and forms a part of the outer periphery of the rotor 25, and directly contacts the web w hung on the outer peripheral surface of the rotor 25. In this example, the conveyance direction of the web w is gradually changed along the arc of the outer periphery of the rotor 25 as described above.
The contact portion 28 suppresses the tension applied to the contacting web w, and prevents the smooth web conveyance from being disturbed by the rotation of the rotor 25. In this example, the contact portion 28 is a roller rotatably provided on the outer peripheral surface of the rotor 25 (hereinafter referred to as the contact roller 28 as necessary). The contact roller 28 is a roller having a smaller diameter than the rotor 25. A plurality of contact rollers 28 are arranged along the circumferential direction of the rotor 25 to form a circle. In this example, the contact roller 28 is a free roller and does not rotate. However, all or some of the contact rollers 28 may rotate.
The contact portion may be configured as a smooth non-rotating member with a small frictional resistance, in addition to the contact roller 28, as long as the tension applied to the web w is suppressed.

(Air blowing part 29)
The air blowing unit 29 is an injection unit that is connected to an air pump (not shown) and blows air from the rotor 25 side to the web w on the downstream side of the rotor 25. The air blowing portion 29 winds the upstream end portion of the cut web w shown in FIG. 3G around the new shaft 11 by blowing the air. Air blowing from the air blowing portion 29 is performed at the timing of starting cutting of the web w.
The web w on the downstream side from the cutting position is wound around the new shaft 11 disposed at the winding position without coming into contact with the cutting blade 26 by blowing out air from the air blowing portion 29.

(Wound roll 21)
The winding roll 21 sandwiches the web w between the new shaft 21 and winds the web w around the new shaft 11 on the upstream side of the conveyance path of the web w from the rotary cutter 20.
The winding roll 21 is formed of an elastic member such as rubber, urethane, or other plastics at least on the outer peripheral surface. In this example, the winding roll 21 is a rubber roll. The winding roll 21 is a free roller that does not rotate. However, the winding roll 21 may be rotated.

(Arm 23)
As shown in FIG. 1, the arm 23 is provided with the rotary cutter 20, the winding roll 21, and the motor 22. In this example, the rotary cutter 20 is provided at the tip of the arm 23. In the arm 23, the winding roll 21 is provided on the base side of the rotary cutter 20, and the motor 22 is provided on the base side of the winding roll 21.
The base side of the arm 23 is fixed to the base body, and the arm 23 can be rotated around the base by an arm driving unit 24.
The arm 23 supports the rotary cutter 20, the winding roll 21, and the motor 22, and can change the positions of the rotary cutter 20 and the winding roll 21 with respect to the new shaft 11 by the rotation of the arm 23. Specifically, the arm 23 arranges the rotary cutter 20 and the winding roll 21 at a retracted position away from the winding shaft and not in contact with the web w during winding of the winding shaft web w. Although not shown, the retracted position is a position away from the winding shaft and the turret 10 in the example shown in FIG. Then, when the winding shaft (old shaft 12) currently being wound on the web w becomes a full winding shaft and the turret 10 replaces the old shaft 12 and the new shaft 11 as described above, the arm 23 is lowered by rotation. The web w shown in FIG. Due to the rotation of the arm 23, the winding roll 21 is brought close to the new shaft 11, the web w is sandwiched between the winding roll 21 and the new shaft 11, and the rotary cutter 20 is connected to the new shaft 11 of the web w. The web w can be hung on the rotor 25 by pressing against the section between the web w and the guide roll 13 on which the web w is hung.

(Arm drive unit 24)
In this example, the arm drive unit 24 is an actuator including a cylinder and a piston that extends and contracts from the cylinder. The base portion of the cylinder is fixed to the base body, and the base end side of the arm 23 is fixed integrally with the base portion of the arm 23 at the tip of the piston. The cylinder expands and contracts the piston with a fluid pressure of fluid such as hydraulic pressure or other liquid, air or other gas. In this example, the cylinder is an air cylinder that expands and contracts the piston with air pressure.
However, the arm drive unit 24 only needs to be able to move the arm 23 relative to the new shaft 11, and can be implemented as a known configuration other than the above-described actuator, such as a link, a cam, or the like.

(Guidance part 3)
The guide unit 3 guides the web w from the web w supply source to the new shaft 11 on the upstream side of the new shaft 11 disposed at the winding position. The guide arm 31 and the guide arm drive unit 32 are guided by the guide unit 3. A first guide roll 33, a second guide roll 34, and a touch roll 35.
The touch roll 35 is fixed to the tip of the guide arm 31, the second guide roll 34 is fixed to the guide arm 31 on the upstream side of the touch roll 35, and the guide arm 31 is first to the upstream side of the second guide roll 34. The guide roll 33 is fixed on the shaft.
The web w is laid from the upstream web w supply destination to the first guide roll 33, then to the second guide roll 34, and then to the touch roll 35. The touch roll 35 contacts the new shaft 11 at the winding position, and presses the web w wound around the new shaft 11 against the new shaft 11.
In this example, the first guide roll 33, the second guide roll 34, and the touch roll 35 are all free rollers and do not rotate. However, at least one of the first guide roll 33, the second guide roll 34, and the touch roll 35 can be implemented as rotating.
Moreover, the guide part 3 can be implemented also as what is provided with more guide rolls, such as a 3rd guide roll. Further, if the web w can be smoothly transported from the upstream side to the new shaft 11, the second guide roll 34 can be provided, or the touch roll 35 can be provided.

The base end portion of the guide arm 31 is fixed to the base body, and the distal end side of the guide arm 31 is rotatable around the base end portion.
The guide arm drive unit 32 is an actuator that rotates the guide arm 31. In this example, the guide arm drive unit 32 includes a piston and a cylinder that is provided on the piston so as to be extendable and contractible. A base end portion of the piston is fixed to the base body. The front end side of the piston is fixed to the guide arm 31, and the guide arm 31 can be rotated by the expansion and contraction of the piston.
However, if the rotation of the guide arm 21 is possible, the guide arm 21 can be implemented by adopting a known configuration other than the actuator, such as a link or a cam.

(Winding detection sensor)
The winding detection sensor is a sensor that detects that the winding shaft becomes a fully wound shaft on which the web w has been wound, although not shown. An optical sensor or a pressure sensitive sensor can be adopted as the winding detection sensor.
In this example, an optical sensor is used as the sensor.
The optical sensor includes a light projecting unit that emits light such as infrared rays and a light receiving unit that receives light emitted from the light projecting unit, and the light projecting unit and the light receiving unit are formed of a roll of a web w that is a fully wound shaft. The light is passed through the surface position, and the winding shaft is fully wound when the light receiving portion senses that the light constantly emitted from the light projecting portion is blocked by the roll of the web w that has become the full winding shaft. Detect that it has become an axis. In addition, it can implement also as what uses said pressure sensitive sensor instead of an optical sensor. The pressure-sensitive sensor is a well-known physical sensor that senses a force caused by contact. The pressure-sensitive sensor is attached to the surface of a free roller that comes into contact with the roll surface of the web w when the winding shaft becomes a full winding shaft. Thus, the pressure sensor contacts the surface of the roll of the web w when the winding shaft becomes a full winding shaft, and detects that the winding shaft has become a full winding shaft.
Moreover, you may employ | adopt the rotary encoder which can detect the frequency | count of rotation of the winding shafts 11 and 12 for a winding detection sensor. As long as the winding detection sensor can detect that the winding shaft has become a full winding shaft, a known sensor other than the above-described optical sensor, pressure-sensitive sensor, and rotary encoder may be employed.

(Contact detection sensor)
When the new shaft 11 is replaced with the old shaft 12 and arranged at the winding position, the arm drive unit 24 lowers the arm 23 from the retracted position to the standby position for cutting as shown in FIG. The rotary cutter 20 of the cutter unit 2 starts to contact the web w. The sensor detects the start of the contact.
Although illustration is omitted, specifically, a known sensor capable of detecting a position such as a pressure sensor or an optical sensor is employed as the sensor.
In this example, a pressure sensitive sensor is employed as the sensor.
The pressure sensor is a well-known physical sensor that senses a force caused by contact. The pressure-sensitive sensor is provided in the rotary cutter 20 and senses contact with the web w.

As the sensor, the above-described optical sensor can be employed instead of the pressure-sensitive sensor. The optical sensor includes a light projecting unit that emits light such as infrared rays and a light receiving unit that receives light emitted from the light projecting unit. The light projecting unit and the light receiving unit are fixed at the contact start position, and The contact start is detected when the light receiving unit senses that the light constantly emitted from the light projecting unit due to the descent is blocked by the rotary cutter 20 or the arm 23. In addition, in the optical sensor, one of the light projecting unit and the light receiving unit is provided on the rotary cutter 20 or the arm 23, and the other one of the light projecting unit and the light receiving unit is fixed at the contact start position. It is good also as what detects the said contact start by a light-receiving part sensing the light of a light projection part by descent | fall.
As the sensor, any sensor other than the pressure-sensitive sensor and the optical sensor can be adopted as long as it can detect the start of the contact.

(Control part)
The control unit is constructed in cooperation with an arithmetic device, a control device, a storage device, an input / output device, and a control program.
The control unit includes an operation control unit that controls the operation of the turret 10, the operation of the arm driving unit 24, the operation of the guide arm driving unit 32, the rotation of the rotary cutter 20, and the operation of the air blowing unit 29.
Further, the control unit includes a tension control unit that controls the tension of the web w. The tension control unit controls the rotation of the winding shafts 11 and 12 so that the tension applied to the web w during winding of the web w is constant.

The flow of web cutting will be briefly described.
1) Replacing the winding shaft During winding of the web w by the rotation of the winding shaft 12, when the winding detection sensor detects that the winding shaft 12 has become a full winding shaft, the operation control unit operates the turret 10 to The old shaft 12 and the new shaft 11 are replaced. Prior to this replacement, the operation control unit operates the guide arm driving unit 32 to lower the guide arm 31 to retract the touch roll 35 to a position that does not interfere with the rotation of the turret 10.
2) Movement of the rotary cutter 20 to the cutting standby position When the replacement is completed, the operation control unit operates the guide arm drive unit 32 to return the guide arm 31 to the original position, and the operation control unit The front end side of the arm 23 is lowered by the operation of the driving unit 24, and the rotary cutter 20 that has been in the retracted position until then is brought into contact with the web w.

  The tension applied to the web w varies from the start of the contact of the rotary cutter 20 to the web w until the arm 23 is disposed at the cutting standby position. When the sensor detects the start of the contact of the rotary cutter 20 with the web w, the tension control unit calculates the time and distance until the rotary cutter 20 reaches the standby position for cutting, and determines the conveyance speed of the web w. The rotational speed of the old shaft 12 is controlled from the roll diameter of the web w wound around the fully wound shaft, that is, the old shaft 12, and the above-described fluctuation in tension is suppressed.

3) Start of rotation of the rotary cutter 20 The operation control unit controls the motor 22 by the control of the inverter to start the rotation of the rotary cutter 20 that has stopped rotating while the arm 23 is being lowered. In FIG. 3, the rotational peripheral speed of the cutting blade 26 is increased so as to reach 150 to 250%, preferably 150 to 200%, of the conveyance speed of the web w (FIGS. 3A to 3E). The operation control unit may start rotation after lowering the rotary cutter 20 to a web cutting standby position. On the other hand, from the viewpoint of time reduction, it is preferable to start the cutting blade 26 while the rotary cutter 20 and the web w are not in contact with each other.
Further, even when the fully-wound shaft, that is, the old shaft 12 is stopped, it is possible to suppress the extra tension between the old shaft 12 and the new shaft 11 by the contact roll 28.

4) Cutting the web w During the second rotation of the rotary cutter 20, the bladed portion 27 projects the cutting blade 26 from the outer periphery of the rotor 25 to cut the web w (FIG. 3 (F)).
The operation control unit stops the rotation of the rotor 25 after returning the position of the cutting blade 26 to the rotation start position (FIG. 3A). Immediately before the rotor 25 is stopped, the operation control unit causes the air blowing unit 29 to blow air onto the upstream web w and wind the upstream web w around the touch roll 35 (FIG. 3G). ).
5) Retraction of rotary cutter 20 After the winding, the operation control unit operates the arm drive unit 24 to raise the arm 23 and return the rotary cutter 20 to the retraction position.

(Modification example of the blade part 27)
4A and 4B show another embodiment of the blade portion 27. FIG.
In the embodiment shown in FIGS. 4A and 4B, unlike the embodiment shown in FIG. 2, the cutting blade 26 itself is fixed to the rotor 25 so that it does not protrude from the rotor 25. Causes the blades 26a of the cutting blade 26 to appear and disappear from the outer periphery of the rotor 25, that is, the circle of the contact roller 28.

Specifically, as illustrated in FIG. 4A, the rotor 25 includes a plurality of radially arranged grooves 25 a extending in the radial direction of the rotor 25. The rotating shaft of each contact roller 28 is rotatably supported by the bearing portion 28a. Each of the bearing portions 28a is accommodated in the grooves 25a and can slide along the grooves 25a. The contact roller 28 can be protruded from the outer peripheral surface of the rotor 25 beyond the cutting edge 26a of the cutting blade 26 by bringing the bearing portion 28a toward the outer peripheral side end portion of the rotor 25 in the groove 25a. Then, by bringing the bearing portion 28a toward the end of the groove 25a on the center axis side of the rotor 25, the contact roller 28 is submerged from the outer peripheral surface of the rotor 25, and the blade edge 26a protrudes relatively outside the circle of the contact roller 28. Can be made.
The bearing portion 28a is urged toward the end on the central axis side of the rotor 25 by a spring (not shown).

A disk-shaped cam plate 27 e formed separately from the rotor 25 is pivotally fixed to the rotor 25 so as to be concentric with the rotor 25 as a blade portion 27. On the outer periphery of the cam plate 27e, a plurality of large diameter portions 27f and small diameter portions 27g are alternately provided. Each position of the large-diameter portion 27f is set so that the distance from the center of the disc-shaped cam plate 27e is substantially the same position as the bearing portion 28a that is close to the end portion on the outer peripheral side of the rotor 25 of the groove 25a. The distance from the center of the disc-shaped cam plate 27e is set to be approximately the same position as the bearing portion 28a brought close to the outer peripheral end of the rotor 25.
As shown in FIG. 4A, the bearing portion 28a is brought into contact with the outer diameter side end portion of the rotor 25 of the groove 25a against the bias of the spring by bringing the bearing portion 28a into contact with the large diameter portion 27f. Then, the contact roller 28 can be protruded from the rotor 25 as described above.
By rotating the cam plate 27e with respect to the rotor 25 from the state of FIG. 4 (A) and bringing the bearing portion 28a into contact with the small diameter portion 25g as shown in FIG. 4 (B), according to the bias of the spring. The bearing portion 28a is brought close to the end of the groove 25a on the center axis side of the rotor 25, and the contact roller 28 can be immersed in the rotor 25 as described above. On the outer periphery of the cam plate 27e, the space between the small diameter portion 25g and the large diameter portion 27f is inclined with respect to the radial direction of the rotor 25 or extends in a curved line, and extends from the small diameter portion 25g of the bearing portion 28a to the large diameter portion 27f. The transition to can be performed smoothly.

  In the embodiment shown in FIGS. 4A and 4B, the contact portion 28, that is, the contact roller 28, is all immersed in the rotor 25. On the other hand, when the web w is cut, the cutting blade 26 is relatively moved to the contact portion 28 located on the rear side in the rotational direction, that is, the rear contact portion 28, or the contact portion 28 located on the front side in the rotational direction, that is, the front contact portion 28. As long as it protrudes in the radial direction of the rotor 25, it is sufficient. That is, at least the rear contact portion 28 located on the rear side in the rotational direction of the cutting blade 26 and the front contact portion 28 located on the front side in the rotational direction among the contact portions 28 are submerged in the radial direction of the rotor 25. It suffices that the contact portion 28 at each position on the outer periphery of the rotor 25 does not have to be sunk. 4A and 4B, the contact roller 28 includes a rear contact roller 28y located on the rear side in the rotational direction of the cutting blade and a front contact located on the front side in the rotational direction. It is only necessary that at least one of the rollers 28x can move in the radial direction of the rotor 25.

(Example of application to drawer device)
FIG. 4C shows an example in which the present invention is implemented in a drawing device that continuously draws out the web w.
In the example of FIG. 4C, contrary to the example shown in FIG. 1, the turret 10 is arranged at the delivery position of the web w with the fully wound shaft as the new axis 11, and the web w has been in the delivery position until then. The lost winding shaft, that is, the old shaft 12 is moved to the replacement position with the full winding shaft for the next web w drawing. In the example shown in FIG. 4C, the delivery position is on the right end of the turret 10, and the exchange position is on the left side of the turret 10. In FIG. 4C, the feeding device (not shown) is formed separately from the winding shafts 11 and 12 and is arranged on the upstream side of the web, and draws the web w from the winding shafts 11 and 12. That is, in the example of FIG. 4C, the flow of the web w is reversed from the example shown in FIG. In the example of FIG. 4C, the above-described guide roll 13 serves as a guide when the web w is pulled out from the winding shaft.

Also in the example shown in FIG. 4C, the flow of cutting the web w is the same as in the embodiment shown in FIGS. However, in the example of FIG. 4C, the air blowing portion 29 shown in FIG. 2 is not provided, and the old web w on the downstream side and the new web w on the upstream side are bonded with the double-sided tape 4.
Specifically, as shown in FIG. 4C, when the old shaft 12 with no web w is retracted to the replacement position and is replaced with the old shaft 12 and the new shaft 11 is arranged at the web withdrawal position, the web w is conveyed. The double-sided tape 4 on the roll surface of the new shaft 11 rotating at the same speed as the speed moves from a position m upstream of the rotary cutter 20 to a position n where the winding roll 21 is located, and is supplied from the old shaft 12. The web w and the web w of the new shaft 11 are bonded. After the bonding, the rotary cutter 20 rotates, and the old web w coming out of the old shaft 12 is separated from the upstream web w to which the new web w is bonded.
Matters not particularly mentioned in FIG. 4C are the same as those in the embodiment shown in FIGS. 1 to 3 and FIGS. 4A and 4B.
In addition to the above-mentioned manual operation, the double-sided tape is supplied by using automatic supply means (tape holding roll 34 and tape supply means 35 in FIGS. 8 and 11 of Patent Document 4) similar to well-known, for example, Patent Document 4. Can be implemented.

(Other)
In the above embodiment, the web is made of a plastic sheet. In addition, the present invention can be implemented in a cutting apparatus for webs other than plastic such as paper and cloth.
The cutting device according to the present invention can also be used to cut a web in a web conveyance line other than web supply and winding.

1
2 Cutter part 3 Guide part 10 Turret 11 Winding axis (new axis)
12 winding shaft (old shaft)
13 Guide roll 20 Rotary cutter 21 Winding roll 22 Motor 23 Arm 24 Arm drive part 25 Rotor 26 Cutting blade 26a (of cutting blade 26) Cutting edge 27 Cutting edge 27a Cam follower 27b Groove cam 27c (of cam follower 27a) Turning fulcrum shaft 27d Free roller 28 Contact part (contact roller)
29 Air blowing part 31 Guide arm 32 Guide arm driving part 33 First guide roll 34 Second guide roll 35 Touch arm

Claims (5)

A feeding device for feeding a long web from the upstream side to the downstream side;
A rotor disposed in the middle of a web feed path by the feed device;
A cutting blade provided on the rotor,
The rotor includes a contact portion that contacts the web on an outer peripheral portion thereof, and changes a direction of the feeding path of the web by contact between the contact portion and the web.
During the rotation of the rotor, at least one of the contact portion and the cutting blade makes a relative movement in the radial direction of the rotor,
Due to the relative movement, the cutting blade protrudes in a radial direction from at least a rear contact portion located on the rear side in the rotation direction of the cutting blade or a front contact portion located on the front side in the rotation direction. in state state, and are not the web is cut,
The web cutting device according to claim 1, wherein the cutting blade is projected by the relative movement when a rotational peripheral speed at the tip of the cutting blade of the rotor becomes faster than a feeding speed of the web. A feeding device for feeding a long web from the upstream side to the downstream side;
A rotor disposed in the middle of a web feed path by the feed device;
A cutting blade provided on the rotor,
The rotor includes a contact portion that contacts the web on an outer peripheral portion thereof, and changes a direction of the feeding path of the web by contact between the contact portion and the web.
During the rotation of the rotor, at least one of the contact portion and the cutting blade makes a relative movement in the radial direction of the rotor,
Due to the relative movement, the cutting blade protrudes in a radial direction from at least a rear contact portion located on the rear side in the rotation direction of the cutting blade or a front contact portion located on the front side in the rotation direction. In such a state, the web is cut,
The web cutting apparatus according to claim 1, wherein the contact portion is a plurality of contact rollers disposed on an outer periphery of the rotor, and the contact rollers are rotatable or rotate by themselves . Among the contact rollers, at least one of a rear contact roller located on the rear side in the rotational direction of the cutting blade and a front contact roller located on the front side in the rotational direction moves in the radial direction of the rotor. The web cutting device according to claim 2 , wherein the web cutting device is provided. The said rotor rotates while contacting the said web, The protrusion of the said cutting blade is made | formed by the said relative movement during the said rotation, The Claim 1 characterized by the above-mentioned. Web cutting device. The web cutting device according to any one of claims 1 to 4 , wherein the cutting blade moves in a radial direction of the rotor.

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