JP2014012289A - Perforating apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a perforating apparatus capable of inexpensively suppressing burnt deposit of a web, which is caused by a laser beam, to suppress deterioration of an appearance of a perforation.SOLUTION: The perforating apparatus 1 includes: a guide plate 20 for guiding a transported web 2; a laser beam oscillation part 31 for oscillating a laser beam L toward the web 2 guided by the guide plate 20; and a laser beam scanning part 33 for scanning with the laser beam L oscillated by the laser beam oscillation part 31 while turning a radiation direction of the laser beam L so as to form a perforation 40 along a width direction of the web 2. The guide plate 20 includes a curved part 21 curved toward the laser scanning part 33 in a recessed shape along a scanning direction of the laser beam L with which the laser scanning part 33 scans.

Description

  The present invention relates to a perforation forming apparatus that forms a perforation along a width direction of a web perpendicular to a conveyance direction by irradiating a continuously conveyed web with a laser beam. The present invention relates to a perforation forming apparatus that can suppress scorching of a web at a low cost and suppress the perforation from being damaged.

  Conventionally, a sewing machine that forms a perforation along a width direction of the web (a direction perpendicular to the conveyance direction) on a web (for example, a paper sheet) continuously conveyed by a roll-to-roll method using a blade. Eye forming devices are known. However, when the blade is used in this way, there is a problem that burrs are easily generated at the perforation opening, and the appearance of the perforation is impaired. In addition, when the blade is worn, there is a problem that it needs to be replaced.

  In order to cope with such a situation, a perforation forming apparatus that forms a perforation along the width direction of a web by irradiating a laser beam is known (see, for example, Patent Documents 1 to 5). Such a perforation forming apparatus is generally configured as shown in FIG. That is, in the perforation forming apparatus 51 shown in FIG. 7, a laser beam oscillator 54 that oscillates the laser beam L is provided above the web 52 that is guided in the X direction while being guided by the guide roller 53, and the laser. The laser beam L applied to the web 52 from the optical oscillator 54 is scanned (scanned) in a predetermined direction by the laser beam scanning head 54a. In this way, the web 52 is laser processed, and the perforation 55 is formed along the width direction of the web 52 (Y direction shown in FIG. 7).

JP 2001-242410 A JP 2001-259869 A JP 2001-259876 A JP 2008-284572 A JP 2004-249333 A

  In the perforation forming apparatuses shown in Patent Documents 1 to 3, laser light oscillated from a laser light source is scanned on a web through a rotatable reflecting mirror, and the web is laser processed. In this case, the focused laser beam is irradiated on the web, and the web is burned out. Thereby, a plurality of perforation openings are formed in the web, and a perforation is obtained as an aggregate of the plurality of perforation openings.

  However, when laser processing a web, the lasered portion of the web is burnt by burning the web. Specifically, scoring occurs on the opening forming surface that forms the perforated opening described above. When the material of the web is paper, such scorching is caused by the fact that the calcium carbonate, which is the main component of the paper, or the surface coating agent that has been applied to the web and soaked into the web is baked and carbonized by laser light. , Is what happens. Note that such scorching of the web may occur in a web formed of other materials regardless of paper.

  As shown in FIG. 8, the laser beam L irradiated to the center portion in the width direction of the web 52 irradiates the web 52 substantially perpendicularly. That is, the perforated opening 56 formed at the center in the width direction of the web 52 is formed such that the opening forming surface 57 is relatively perpendicular to the front surface (or back surface) of the web 52. For this reason, the area of the opening forming surface 57 is reduced and the area of the burn is also reduced. Further, since the opening formation surface 57 of the perforation opening 56 is nearly vertical, the scoring generated on the opening formation surface 57 of the perforation opening 56 becomes relatively inconspicuous when viewed from the surface of the web 52.

  However, the laser beam L applied to both sides in the width direction of the web 52 is applied to the web 52 while being inclined. That is, the laser beam L irradiated to both sides in the width direction is inclined by an angle θ with respect to the laser beam L irradiated to the center portion in the width direction. For this reason, the perforated openings 56 formed on both sides in the width direction of the web 52 are formed such that the opening forming surfaces 57 are inclined. For this reason, the area of the opening forming surface 57 is increased and the area of the burn is also increased. Further, when viewed from the surface of the web 52, since the opening forming surface 57 of the perforated opening 56 is inclined, the scoring generated on the opening forming surface 57 of the perforated opening 56 becomes conspicuous. There is a problem that the appearance of 55 is impaired. In particular, when the width of the web 52 is large, the opening forming surface 57 of the perforated opening 56 may be further inclined, and in this case, scoring becomes more conspicuous.

  Patent Document 4 describes that a decomposition product generated when a workpiece is irradiated with a laser beam is sucked in the vicinity of the irradiated portion of the laser beam. However, since scorching has occurred in the paper, it is difficult to suck the scorch itself.

  In Patent Document 5, it is described that a cooling gas is blown onto a laser light irradiation portion in order to prevent the occurrence of scorching when a sheet such as paper is laser processed. However, in this case, it is necessary to always blow a cooling gas during laser processing. For this reason, there exists a problem that the cost for spraying the gas for cooling starts.

  The present invention has been made in consideration of such points, and provides a perforation forming apparatus that can suppress the scorching of the web by laser light at a low cost and suppress the deterioration of the appearance of the perforation. With the goal.

  The present invention relates to the web being conveyed in the perforation forming apparatus that forms a perforation along the width direction of the web perpendicular to the conveying direction by irradiating the continuously conveyed web with laser light. A guide plate for guiding the laser beam, a laser beam oscillation unit for oscillating the laser beam toward the web guided by the guide plate, and a laser beam oscillated from the laser beam oscillation unit for the width direction of the web A laser beam scanning unit that scans the laser beam by rotating an irradiation direction of the laser beam so as to form a perforation along the line, and the guide plate is scanned by the laser beam scanning unit There is provided a perforation forming apparatus having a curved part that is concavely curved toward the laser light scanning part along the scanning direction of the laser light.

  In the perforation forming apparatus described above, the curved portion of the guide plate is formed in an arc shape along the scanning direction of the laser beam, with the rotation center in the irradiation direction of the laser beam as the center. Is preferable.

  In the perforation forming apparatus described above, the web is disposed on the opposite side of the guide plate from the laser beam scanning unit side, and the laser beam scanning unit is disposed on the curved portion of the guide plate. A guide plate opening through which the laser beam scanned by the laser beam is provided; the curved portion includes an upstream curved portion provided upstream in the transport direction of the guide plate opening; and a transport direction of the guide plate opening. And a downstream curved portion provided on the downstream side.

  In the perforation forming apparatus described above, it is preferable that the guide plate opening is formed in a slit shape along the scanning direction of the laser beam.

  Moreover, in the perforation forming apparatus described above, it is preferable that the guide plate opening is formed in a rectangular shape along the conveyance direction of the web.

  Moreover, in the perforation forming apparatus described above, it is preferable that the guide plate is formed in a U shape along the conveyance direction of the web.

  In the perforation forming apparatus described above, the web is disposed on the laser beam scanning unit side with respect to the guide plate, and the guide plate is formed linearly along the web conveyance direction. It is preferable.

  In the perforation forming apparatus described above, the guide plate is provided on the upstream side in the web conveyance direction from the curved portion, and on the downstream side in the web conveyance direction from the curved portion. An outlet portion, wherein the inlet portion and the outlet portion are formed flat in the width direction of the web, and the guide plate is gradually curved from the inlet portion toward the curved portion. It is preferable that the outlet portion is formed so as to be gradually bent toward the bending portion.

  ADVANTAGE OF THE INVENTION According to this invention, the scorching of the web by a laser beam can be suppressed at low cost, and it can suppress that the external appearance of a perforation is impaired.

FIG. 1 is a diagram showing an overall configuration of a perforation forming apparatus according to a first embodiment of the present invention. FIG. 2 is a perspective view showing a guide plate of the perforation forming apparatus of FIG. FIG. 3 is a view as seen from the direction A of FIG. 2 and shows the web and the guide plate in a flat shape. 4 is a cross-sectional view of the guide plate taken along line BB in FIG. 5 is a cross-sectional view showing a perforation opening formed in the perforation forming apparatus of FIG. FIG. 6 is a perspective view showing a guide plate of the perforation forming apparatus in the second embodiment of the present invention. FIG. 7 is a view showing a conventional perforation forming apparatus. FIG. 8 is a cross-sectional view showing a perforation opening in a conventional perforation forming apparatus.

  A perforation forming apparatus according to an embodiment of the present invention will be described with reference to FIGS. The perforation forming apparatus irradiates a continuously conveyed web (for example, a paper sheet) with a laser beam made of, for example, a carbon dioxide laser to form a perforation along a width direction orthogonal to the conveyance direction. belongs to. In the drawings attached to the present specification, for the sake of illustration and ease of understanding, the scale, the vertical / horizontal dimension ratio, and the like are appropriately changed and exaggerated from those of the actual ones.

(First embodiment)
As shown in FIG. 1, the perforation forming apparatus 1 is provided on a downstream side in the transport direction of the paper feed unit 10 and a paper feed unit 10 around which a web (for example, a paper sheet) 2 continuous in a belt shape is wound. A guide plate 20 that guides the web 2 conveyed from the paper unit 10 and a laser light oscillator 30 that oscillates the laser light L toward the web 2 guided by the guide plate 20 are provided. In the present embodiment, the web 2 is disposed on the opposite side of the guide plate 20 from the laser light oscillator 30 side.

  Between the sheet feeding unit 10 and the guide plate 20, a meandering correction unit 11, a first S-shaped pull roller 12, and a first dancer roller 13 are provided in this order. Among them, the meandering correction unit 11 adjusts the position in the width direction (Y direction shown in FIG. 3) orthogonal to the conveyance direction (X direction shown in FIGS. 1 to 3) of the web 2 conveyed from the paper supply unit 10. Thus, the meandering of the web 2 is corrected. The first S-shaped pull roller 12 is for adjusting the conveyance speed of the web 2 conveyed from the paper supply unit 10 to the guide plate 20. The first dancer roller 13 is configured to measure the tension of the web 2 conveyed to the guide plate 20 based on the dancer's position.

  A second dancer roller 14 and a second S-shaped pull roller 15 are provided in this order on the downstream side of the guide plate 20 in the conveying direction. Similar to the first dancer roller 13, the second dancer roller 14 is configured to measure the tension of the web 2 conveyed from the guide plate 20 based on the position of the dancer. The second S-shaped pull roller 15 is for adjusting the conveyance speed of the web 2 conveyed from the guide plate 20. On the downstream side in the transport direction of the second S-shaped pull roller 15, a winding unit 16 that winds the web 2 on which the perforation 40 (see FIG. 3) is formed is provided. A meandering correction unit 11 may be provided between the second S-shaped pull roller 15 and the winding unit 16 in the same manner as between the paper feeding unit 10 and the first S-shaped pull roller 12. In this case, the meandering of the web 2 conveyed to the winding unit 16 can be corrected.

  When the tension of the web 2 measured by the first dancer roller 13 deviates from a predetermined range, the conveyance speed of the web 2 is adjusted by the first S-shaped pull roller 12 and the second S-shaped pull roller 15. Similarly, when the tension of the web 2 measured by the second dancer roller 14 is out of a predetermined range, the conveyance speed of the web 2 is adjusted by the first S-shaped pull roller 12 and the second S-shaped pull roller 15. In this way, the tension of the web 2 being conveyed is configured to fall within a predetermined range. In addition, adjustment of the conveyance speed of the web 2 may be performed only by the first S-shaped pull roller 12 or may be performed only by the second S-shaped pull roller 15. In addition, a tension pickup roller (not shown) can be used instead of the dancer rollers 13 and 14. Further, FIG. 1 shows an example in which the winding unit 16 is provided on the downstream side in the transport direction of the second S-shaped pull roller 15, but the present invention is not limited to this, and the web in which the perforation 40 is formed. 2 may be conveyed to other printing equipment, processing machine, etc. (not shown) without being wound up.

  The web 2 conveyed in this way is guided by a plurality of guide rollers 17 provided at appropriate positions while being conveyed from the paper supply unit 10 to the winding unit 16.

  A dust collector 18 is provided below the guide plate 20. The dust collector 18 is for collecting dust or the like of the web 2 generated from the web 2 laser-processed by the laser light L. Such a dust collector 18 includes a receiving portion 18a that receives the waste of the web 2 that has fallen freely, a screw roller 18b that is provided at a lower portion of the receiving portion 18a and collects the waste of the web 2 received by the receiving portion 18a, It can be set as the structure which has these. The screw roller 18b collects the waste of the web 2 and discharges it to the outside.

  Next, the guide plate 20 and the laser light oscillator 30 will be described with reference to FIGS. Among these, first, the laser beam oscillator 30 will be described.

  As shown in FIG. 2, the laser beam oscillator 30 includes a laser beam oscillation unit 31 that oscillates the laser beam L toward the web 2 guided by the guide plate 20, and a laser beam oscillated from the laser beam oscillation unit 31. And a laser beam scanning head 32 for scanning L. The laser beam oscillator 30 is fixed to a main body frame (not shown) of the perforation forming apparatus 1.

  The laser beam scanning head 32 includes a rotatable reflecting mirror (laser beam scanning unit, see FIG. 4) 33 that scans the laser beam L oscillated from the laser beam oscillation unit 31, and a scanner that rotates the reflecting mirror 33 (see FIG. 4). (Not shown). When the scanner rotates the reflecting mirror 33, the laser beam L oscillated from the laser beam oscillation unit 31 rotates its irradiation direction and follows the scanning direction (Z direction shown in FIGS. 2 to 4). Scanned. The scanning direction of the laser beam L is inclined at a predetermined angle with respect to the conveying direction of the web 2 as shown in FIG. 3 when the web 2 is viewed from the A direction in FIG. This angle is appropriately set according to the conveyance speed of the web 2, or the conveyance speed of the web 2 is appropriately set according to this angle. As a result, the perforation 40 is formed along the width direction of the web 2. 3 shows an example in which the perforation 40 is formed over the entire width direction of the web 2, the perforation forming apparatus 1 according to the present embodiment forms a perforation in a part in the width direction. It is also possible to apply to this. For the sake of clarity, the web 2 is omitted in FIG. 2, and the laser beam oscillator 30 is omitted in FIG.

  Next, the guide plate 20 will be described. The guide plate 20 is fixed to a main body frame (not shown) of the perforation forming device 1, similarly to the laser beam oscillator 30.

  As shown in FIGS. 2 and 4, the guide plate 20 has a curved portion 21 that is curved along the scanning direction of the laser light L scanned by the laser light scanning head 32. The curved portion 21 is curved in a concave shape toward the reflecting mirror 33. In particular, as shown in FIG. 4, the bending portion 21 is formed in an arc shape around the rotation center in the irradiation direction of the laser light L (indicated by a point O in the form shown in FIG. 4). preferable. That is, it is formed in an arc shape along the scanning direction of the laser light L around the intersection of the light beam of the laser light L irradiated at one scanning position and the light beam of the laser light L irradiated at another scanning position. . In this case, it becomes possible to irradiate the web 2 with the laser beam L perpendicularly at each scanning position. Here, the scanning position indicates the position of the laser beam L while being scanned along the scanning direction. For example, the scanning position at the start of scanning is indicated by P1 in FIGS. The scanning position when the laser beam L is applied to the center in the width direction of the web 2 is indicated by P2, and the scanning position at the end of the scanning is indicated by P3. The intersection of the light beams of the laser light L at P1, P2, and P3 is a point O.

  As shown in FIGS. 2 and 3, the bending portion 21 is provided with a guide plate opening 22 through which the laser light L scanned by the reflecting mirror 33 passes. Thereby, it is possible to irradiate the web 2 disposed on the side opposite to the laser beam scanning head 32 side with respect to the guide plate 20 with the laser beam L. In the present embodiment, the guide plate opening 22 is formed in a slit shape along the scanning direction of the laser light L.

  The curved portion 21 includes an upstream curved portion 21a provided on the upstream side of the guide plate opening 22 in the transport direction, and a downstream curved portion 21b provided on the downstream side of the guide plate opening 22 in the transport direction. It is out. That is, the guide plate opening 22 is disposed between the upstream curved portion 21a and the downstream curved portion 21b.

  The guide plate 20 is formed in a U shape along the conveyance direction of the web 2, and the web 2 is guided by the outer surface of the guide plate 20 (the surface opposite to the laser light oscillation unit 31 side). It is designed to be transported. That is, the guide plate 20 includes an inlet portion 23 extending in the up-down direction provided on the upstream side in the transport direction from the bending portion 21, and an outlet portion 24 extending in the transport direction on the downstream side of the bending portion 21. Further, it has. The inlet portion 23 and the outlet portion 24 are formed flat in the width direction of the web 2. The guide plate 20 is smoothly formed as a whole so as to bend gradually from the inlet portion 23 toward the bending portion 21 and gradually bend from the outlet portion 24 toward the bending portion 21. In addition, the web 2 can be guided along the shape of the guide plate 20 while suppressing formation of wrinkles on the web 2 by applying a predetermined tension to the web 2. In the bending portion 21, the web 2 is bent along the scanning direction of the laser light L, that is, formed in an arc shape.

  Next, the operation of the present embodiment having such a configuration will be described.

  As shown in FIG. 1, the web 2 supplied from the paper feeding unit 10 is first conveyed to the meandering correction unit 11, and the position of the web 2 in the width direction is adjusted. Subsequently, the sheet is conveyed to the guide plate 20 through the first S-shaped pull roller 12 and the first dancer roller 13. During this time, the tension of the web 2 is measured by the first dancer roller 13, and when the measured tension of the web 2 is out of a predetermined range, the web 2 is conveyed by the first S-shaped pull roller 12 and the second S-shaped pull roller 15. The speed is adjusted. Thereby, the tension of the web 2 is adjusted.

  The web 2 conveyed to the inlet 23 of the guide plate 20 has a flat shape in the width direction. The web 2 is guided from the flat inlet portion 23 toward the curved portion 21 while gradually curving the shape of the web 2. The web 2 is bent along the shape of the bending portion 21 at the bending portion 21. That is, as shown in FIG. 4, the shape of the web 2 in the curved portion 21 becomes an arc shape along the scanning direction of the laser light L with the rotation center in the irradiation direction of the laser light L as the center.

  The web 2 formed in an arc shape is irradiated with the laser light L through the guide plate opening 22. In this case, the reflecting mirror 33 of the laser beam scanning head 32 rotates. Thereby, as shown in FIGS. 3 and 4, the laser beam L is scanned from the scanning position indicated by P1 to the scanning position indicated by P3 through the scanning position indicated by P2. That is, the laser beam L is scanned in a direction inclined at a predetermined angle with respect to the web 2 conveyance direction. Further, while the laser beam L is being scanned, the laser beam L is intermittently applied to the web 2. That is, in the laser beam oscillation unit 31, oscillation and stop of the laser beam L are alternately repeated. In this way, as shown in FIG. 3, a perforation 40 extending along the width direction of the web 2 is formed.

  The portion of the web 2 irradiated with the laser light L is burned out by the laser light L. In this way, a plurality of perforation openings 41 as shown in FIG. 5 are formed. At this time, the shape of the web 2 positioned in the guide opening 22 can be maintained in an arc shape along the scanning direction of the laser light L by the upstream curved portion 21 a and the downstream curved portion 21 b of the curved portion 21. . Thus, as shown in FIG. 4, the laser beam L is irradiated perpendicularly to the web 2 at each scanning position including P1, P2, and P3. For this reason, the shape of each perforation opening 41 formed in the web 2 is such that the opening forming surface 42 that forms each perforation opening 41 is on the front surface (or back surface) of the web 2 as shown in FIG. In contrast, tilting is suppressed and the vertical direction is approached. FIG. 5 shows a cross section of the perforation opening 41 along the scanning direction of the laser beam L. Further, the laser light L is irradiated from the portion of the perforation opening 41 closer to the laser beam scanning head 32 and the web 2 is burned out, so that the portion closer to the laser beam scanning head 32 becomes closer to the laser beam scanning head 32. The time for which the laser beam L is irradiated is longer than that of the portion on the far side. For this reason, the portion of the perforation opening 41 closer to the laser beam scanning head 32 tends to have a larger opening.

  As shown in FIG. 1, the scraps of the web 2 burned out by the laser light L fall freely toward the dust collector 18 provided below the guide plate 20 and are collected by the dust collector 18. Dust is collected.

  As shown in FIG. 2, the web 2 in which the perforations 40 are formed is guided from the curved portion 21 toward the flat outlet portion 24 while gradually changing the shape of the web 2 to a flat shape. As a result, the shape of the web 2 in the width direction is flat at the outlet 24.

  Thereafter, the web 2 is conveyed to the winding unit 16 through the second dancer roller 14 and the second S-shaped pull roller 15 as shown in FIG. During this time, the tension of the web 2 is measured by the second dancer roller 14, and when the measured tension of the web 2 is out of a predetermined range, the web 2 is conveyed by the first S-shaped pull roller 12 and the second S-shaped pull roller 15. The speed is adjusted. Thereby, the tension of the web 2 is adjusted.

  As described above, according to the present embodiment, in the curved portion 21 of the guide plate 20, the web 2 is curved along the scanning direction of the laser light L and concave toward the reflecting mirror 33 of the laser light scanning head 32. In this state, the laser beam L is irradiated from the laser beam scanning head 32 to the web 2 through the guide plate opening 22. Accordingly, the irradiation angle of the laser beam L applied to the web 2 at each scanning position of the laser beam L can be made close to perpendicular to the front surface (or back surface) of the web 2. For this reason, the opening formation surface 42 of the perforation opening 41 formed in the web 2 by the laser light L can be brought close to the surface of the web 2 perpendicularly, and the opening formation surface 42 of the perforation opening 41 is The area can be reduced. As a result, it is possible to suppress scorching of the web 2 generated on the opening forming surface 42 of the perforated opening 41. Further, since the opening forming surface 42 of the perforation opening 41 can be made to be perpendicular to the surface of the web 2, it is generated on the opening forming surface 42 of the perforation opening 41 when viewed from the surface of the web 2. It is possible to make the burnt inconspicuous, and to prevent the appearance of the perforation 40 from being damaged.

  Further, according to the present embodiment, the bending portion 21 of the guide plate 20 follows the scanning direction of the laser light L around the rotation center of the irradiation direction of the laser light L scanned by the rotating reflecting mirror 33. It is formed in an arc shape. Thus, the irradiation angle of the laser beam L applied to the web 2 can be made perpendicular to the surface of the web 2 at each scanning position. As a result, the scorch of the web 2 generated on the opening forming surface 42 of the perforation opening 41 can be further suppressed, and the appearance of the perforation 40 can be further suppressed from being damaged.

  Further, according to the present embodiment, the upstream curved portion 21a and the downstream curved portion 21b are provided on both sides of the guide plate opening 22 in the transport direction. Thereby, the shape of the web 2 located in the guide plate opening 22 can be maintained in an arc shape along the scanning direction of the laser beam L by the upstream curved portion 21a and the downstream curved portion 21b. This makes it possible to make the irradiation angle of the laser beam L applied to the web 2 more perpendicular to the surface of the web 2 at each scanning position.

  Further, according to the present embodiment, the guide plate opening 22 is formed in a slit shape along the scanning direction of the laser light L. Thereby, the shape of the web 2 positioned at the guide plate opening 22 can be maintained in an arc shape along the scanning direction of the laser light L. For this reason, at each scanning position of the laser beam L, the irradiation angle of the laser beam L applied to the web 2 can be made more reliably perpendicular to the surface of the web 2. In this case, the contact area between the web 2 and the guide plate 20 can be increased, and the conveyance of the web 2 can be stabilized.

  In addition, according to the present embodiment, as described above, the web 2 is curved by the guide plate 20 to suppress the scoring of the web 2. As a result, the running cost can be prevented from increasing, and the scorching of the web 2 can be suppressed at a low cost.

  Moreover, according to this Embodiment, the guide plate 20 is formed in the U shape along the conveyance direction of the web 2. As shown in FIG. Thereby, the space efficiency of the guide plate 20 that bends the flat web 2 can be improved, and the perforation forming apparatus 1 can be prevented from being enlarged.

  Furthermore, according to the present embodiment, the inlet portion 23 and the outlet portion 24 of the guide plate 20 are formed flat in the width direction of the web 2, and the guide plate 20 extends from the inlet portion 23 to the curved portion 21. It is gradually curved toward the curved portion 21 from the outlet 24. Accordingly, the flat web 2 can be guided while being gradually bent from the inlet portion 23 toward the curved portion 21, and the curved web 2 is bent from the curved portion 21 toward the outlet portion 24. Can be guided while gradually flattening. For this reason, it is possible to suppress the formation of wrinkles on the web 2.

  In the above-described embodiment, the example in which the guide plate opening 22 of the guide plate 20 is formed in a slit shape along the scanning direction of the laser light L has been described. However, the present invention is not limited to this, and the guide plate opening 22 may be formed in a rectangular shape along the conveyance direction of the web 2 as long as the laser light L scanned by the reflecting mirror 33 can pass therethrough. Good. In this case, the area of the guide plate opening 22 can be increased, the web 2 can be subjected to laser processing other than the perforation 40, and the perforation forming apparatus 1 can be provided with versatility.

  Moreover, in this Embodiment mentioned above, the guide plate 20 demonstrated the example currently formed in the U shape along the conveyance direction of the web 2. As shown in FIG. However, the present invention is not limited to this, and the guide plate 20 may be formed in a smooth L shape along the conveyance direction of the web 2. In this case, the entrance part 23 or the exit part 24 of the guide plate 20 may be formed so as to extend in the vertical direction.

(Second Embodiment)
Next, a perforation forming apparatus according to a second embodiment of the present invention will be described with reference to FIG.

  In the second embodiment shown in FIG. 6, the web is provided on the laser beam oscillator side with respect to the guide plate, and the guide plate is mainly formed in a straight line along the web conveyance direction. The other configurations are substantially the same as those of the first embodiment shown in FIGS. In FIG. 6, the same parts as those of the first embodiment shown in FIGS. 1 to 5 are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIG. 6, the web 2 is disposed on the laser light oscillator 30 side with respect to the guide plate 20. Further, the guide plate 20 is formed linearly along the conveyance direction of the web 2, and the web 2 is guided on the upper surface of the guide plate 20. And the guide plate 20 has the curved part 21, and the entrance part 23 and the exit part 24 which were formed in flat shape. Of these, the curved portion 21 is preferably formed in an arc shape around the rotation center in the irradiation direction of the laser light L, as in the first embodiment. Since the web 2 is disposed on the laser beam oscillator 30 side with respect to the guide plate 20, the curved portion 21 is provided with a guide plate opening 22 as shown in FIGS. Absent.

  Thus, according to the present embodiment, the web 2 is arranged on the laser light oscillator 30 side with respect to the guide plate 20. Accordingly, it is not necessary to provide the guide plate 20 with the guide plate opening 22 as shown in FIGS. 2 to 4, and the laser light L can be directly applied to the web 2 from the laser light oscillator 30. For this reason, the portion of the web 2 irradiated with the laser light L can be more reliably maintained in an arc shape along the scanning direction of the laser light L. For this reason, at each scanning position of the laser beam L, the irradiation angle of the laser beam L irradiated to the web 2 can be made more reliably perpendicular to the front surface (or back surface) of the web 2. As a result, the burn of the web 2 can be further suppressed, and the appearance of the perforation 40 can be further suppressed from being damaged.

  Further, according to the present embodiment, the guide plate 20 is formed linearly along the conveyance direction of the web 2. In this case, the formation of wrinkles on the web 2 can be suppressed.

  As mentioned above, although the embodiment of the present invention has been described in detail, the perforation forming device according to the present invention is not limited to the above-described embodiment at all, and various modifications can be made without departing from the spirit of the present invention. Is possible.

DESCRIPTION OF SYMBOLS 1 Perforation forming apparatus 2 Web 20 Guide plate 21 Bending part 21a Upstream side bending part 21b Downstream side bending part 22 Guide plate opening part 23 Inlet part 24 Outlet part 31 Laser beam oscillation part 33 Reflecting mirror 40 Perforation L Laser beam

Claims (8)

In the perforation forming apparatus for forming a perforation along the width direction of the web perpendicular to the conveyance direction by irradiating the web being continuously conveyed with laser light,
A guide plate for guiding the web being conveyed;
A laser beam oscillation unit that oscillates the laser beam toward the web guided by the guide plate;
A laser beam scanning unit that scans the laser beam by rotating the irradiation direction of the laser beam so that the laser beam oscillated from the laser beam oscillation unit forms a perforation along the width direction of the web; With
The guide plate has a perforation that has a curved portion that is concavely curved toward the laser beam scanning unit along the scanning direction of the laser beam scanned by the laser beam scanning unit. apparatus.   The said curved part of the said guide plate is formed in circular arc shape along the scanning direction of the said laser beam centering | focusing on the rotation center of the irradiation direction of the said laser beam. Perforation forming device. The web is disposed on the side opposite to the laser beam scanning unit with respect to the guide plate,
The curved portion of the guide plate is provided with a guide plate opening through which the laser light scanned by the laser light scanning unit passes.
The curved portion includes an upstream curved portion provided on the upstream side in the transport direction of the guide plate opening, and a downstream curved portion provided on the downstream side in the transport direction of the guide plate opening. The perforation forming apparatus according to claim 1 or 2.   The perforation forming apparatus according to claim 3, wherein the guide plate opening is formed in a slit shape along a scanning direction of the laser light.   The perforation forming apparatus according to claim 3, wherein the guide plate opening is formed in a rectangular shape along a conveyance direction of the web.   The perforation forming apparatus according to claim 3, wherein the guide plate is formed in a U shape along a conveyance direction of the web. The web is disposed on the laser beam scanning unit side with respect to the guide plate,
The perforation forming apparatus according to claim 1, wherein the guide plate is linearly formed along a conveyance direction of the web. The guide plate further includes an inlet portion provided on the upstream side in the web conveyance direction from the curved portion, and an outlet portion provided on the downstream side in the web conveyance direction from the curved portion,
The inlet portion and the outlet portion are formed flat in the width direction of the web,
The said guide plate is formed so that it may curve gradually toward the said curved part from the said entrance part while gradually curving toward the said curved part from the said exit part. 8. The perforation forming apparatus according to any one of 7 above.

Images