Rotary cutter device

Abstract

To provide a rotary cutter device capable of easily changing a cutting angle of a blade tip of a knife relative to a cutting object depending on the type of the cutting object and a portion where cutting unevenness occurs.SOLUTION: A knife 21 provided between vertical wall surfaces 32, 42 of first and second knife holders 3, 4 is attached in a state of being in close contact only with the vertical wall surface 32 of the first knife holder 3, and provided with a gap that allows a slight inclination relative to the vertical wall surface 42 of the second knife holder 4. A knife-side through hole 61 is provided at a circumferential position closer to the knife side of a first bolt insertion hole 36 of the first knife holder 3, and an opposite-knife-side through hole 62 is provided at a circumferential position opposite to the knife side of the first bolt insertion hole 36. Clamping screws 63 are respectively threaded into the knife-side through hole 61 and the opposite-knife-side through hole 62 so that their tips are in point contact with the outer circumferential surface of a knife rotor 22.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a rotary cutter device that cuts an object to be cut, such as paper or optical film, using a knife attached to a knife rotor and a plane rotor that faces the knife rotor. [Background technology]

[0002] Generally, this type of rotary cutter device comprises a knife rotor, a knife attached spirally to the outer surface of the knife rotor via a pair of first and second knife holders in the circumferential direction, and a plain rotor facing the knife rotor, and the sheet-like material to be cut is cut between the knife and plain rotor from one side to the other side in the axial direction of the knife rotor.

[0003] In such a rotary cutter device, the first knife holder is provided with a first bolt insertion hole and a positioning protrusion that can fit into a fitting groove formed on the outer surface of the knife rotor, and this positioning protrusion is fitted into the fitting groove, and the first bolt inserted into the first bolt insertion hole is screwed into the first bolt hole provided on the outer surface of the knife rotor, thereby fixing the first knife holder to the outer surface of the knife rotor.

[0004] On the other hand, the second knife holder is fixed to the outer surface of the knife rotor by screwing a second bolt inserted into a second bolt insertion hole into a second bolt hole provided on the outer surface of the knife rotor.

[0005] The knife is provided between the facing vertical walls of the first and second knife holders and is attached in close contact only with the vertical wall of the first knife holder, while leaving a gap to allow slight inclination relative to the vertical wall of the second knife holder. In this case, the first knife holder functions as a reference holder that positions the inclination angle of the knife cutting edge, while the second knife holder functions as an adjustment holder that adjusts the slight gap between the knife and the vertical wall, so that when cutting an object, the inclination of the knife cutting edge can be changed within the gap between the vertical wall of the first and second knife holders. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Laid-Open No. 2009-226514 Summary of the Invention [Problem to be solved by the invention]

[0007] However, since the knives of the rotary cutter device are long and extend from one side to the other in the axial direction of the knife rotor, when cutting an object, the cutting may not be uniform from one side to the other in the axial direction of the knife rotor, resulting in a cut that is uneven, i.e., a continuous cut occurs in some areas. This cut unevenness may occur depending on the type of object or due to a change in the angle at which the knife cutting edge penetrates the object from one side to the other in the axial direction of the knife rotor.

[0008] In this case, by adjusting the angle of penetration of the knife blade into the workpiece, i.e., the cutting angle of the knife blade relative to the direction of rotation of the knife rotor, the degree of penetration of the knife blade into the workpiece can be changed, thereby preventing uneven cutting due to changes in the type of workpiece or the angle of penetration of the knife blade into the workpiece.

[0009] However, the first knife holder is fixed to the outer circumferential surface of the knife rotor by fitting the positioning protrusion into the fitting groove on the outer circumferential surface of the knife rotor and screwing the first bolt inserted into the first bolt insertion hole into the first bolt hole on the outer circumferential surface of the knife rotor, which makes it difficult to adjust the cutting angle of the knife blade relative to the material each time depending on the type of material or the location where uneven cutting occurs, and makes it difficult to easily prevent uneven cutting.

[0010] The present invention was made in consideration of these points, and its purpose is to provide a rotary cutter device that can easily change the cutting angle of the knife blade relative to the workpiece depending on the type of workpiece and the area where cutting unevenness occurs. [Means for solving the problem]

[0011] To achieve the above object, the present invention provides a rotary cutter device including a knife rotor, knives spirally attached to the outer circumferential surface of the knife rotor via a pair of first and second knife holders in the circumferential direction, and a plain rotor facing the knife rotor, for cutting a sheet-like material between the knives and the plain rotor. The first knife holder is provided with a first bolt insertion hole and a positioning protrusion that can be fitted into a fitting groove formed in the outer circumferential surface of the knife rotor. The first knife holder is fixed to the outer circumferential surface of the knife rotor by fitting the positioning protrusion into the fitting groove and screwing a first bolt inserted into the first bolt insertion hole into a first bolt hole formed in the outer circumferential surface of the knife rotor. Meanwhile, the second knife holder is provided with a second bolt insertion hole, and a second bolt inserted into the second bolt insertion hole is screwed into a second bolt hole formed in the outer circumferential surface of the knife rotor to fix the second knife holder to the outer circumferential surface of the knife rotor. The knife is provided between the opposing vertical wall surfaces of the first and second knife holders and is attached in a state of intimate contact only with the vertical wall surface of the first knife holder, while being housed with a gap that allows slight inclination relative to the vertical wall surface of the second knife holder.A knife-side through-hole that passes through the first knife holder is provided at a position circumferentially closer to the knife side of the first bolt insertion hole of the first knife holder, and a screw member whose tip end presses against the outer circumferential surface of the knife rotor is screwed into this knife-side through-hole.

[0012] In contrast, another solution proposed by the present invention to achieve the above-mentioned object is similarly based on a rotary cutter device that cuts a sheet-like material between a plain rotor and knives attached in a spiral shape to the outer circumferential surface of a knife rotor via first and second knife holders, wherein the first knife holder is provided with a positioning protrusion that can be fitted into a first bolt insertion hole and a fitting groove on the outer circumferential surface of the knife rotor, the positioning protrusion is fitted into the fitting groove, and a first bolt inserted into the first bolt insertion hole is screwed into a first bolt hole on the outer circumferential surface of the knife rotor, thereby fixing the first knife holder to the outer circumferential surface of the knife rotor, and the second knife holder is fixed to the outer circumferential surface of the knife rotor by a second bolt inserted into a second bolt insertion hole and screwed into a second bolt hole on the outer circumferential surface of the knife rotor. The knife is provided between the opposing vertical wall surfaces of the first and second knife holders and is attached in close contact only with the vertical wall surface of the first knife holder, while being accommodated with a gap that allows slight inclination relative to the vertical wall surface of the second knife holder.An anti-knife-side through hole that passes through the first knife holder is provided at a position circumferentially closer to the anti-knife side of the first bolt insertion hole, and a screw member whose tip presses against the outer circumferential surface of the knife rotor is screwed into this anti-knife-side through hole.

[0013] Another solution provided by the present invention to achieve the above object is similarly based on a rotary cutter device that cuts a sheet-like material between a plain rotor and knives spirally attached to the outer circumferential surface of a knife rotor via first and second knife holders, wherein the first knife holder is provided with a positioning protrusion that can fit into a first bolt insertion hole and a fitting groove on the outer circumferential surface of the knife rotor, the positioning protrusion is fitted into the fitting groove, and a first bolt inserted into the first bolt insertion hole is screwed into a first bolt hole on the outer circumferential surface of the knife rotor, thereby fixing the first knife holder to the outer circumferential surface of the knife rotor, and the second knife holder is fixed to the outer circumferential surface of the knife rotor by a second bolt inserted into a second bolt insertion hole and screwed into a second bolt hole on the outer circumferential surface of the knife rotor. The knife is provided between the opposing vertical wall surfaces of the first and second knife holders and is attached in close contact only with the vertical wall surface of the first knife holder, while being housed with a gap that allows slight inclination relative to the vertical wall surface of the second knife holder. A knife-side through-hole and an anti-knife-side through-hole that pass through the first knife holder are provided at circumferential positions of the first bolt insertion hole closer to the knife side and closer to the anti-knife side, respectively, and screw members whose tips press against the outer circumferential surface of the knife rotor are screwed into the knife-side through-hole and the anti-knife-side through-hole, respectively.

[0014] It is also preferable to use a clamping screw as the screw member, the tip of which comes into point contact or line contact with the outer circumferential surface of the knife rotor.

[0015] The first knife holder may be formed in a generally block shape such that a portion thereof facing the outer circumferential surface of the knife rotor abuts against the outer circumferential surface of the knife rotor over substantially the entire area.

[0016] The second knife holder may be provided with an insertion hole for the eccentric portion of the position adjustment bushing. The position adjustment bushing is then attached to the insertion hole via the eccentric portion, a second bolt is inserted into the through hole of the position adjustment bushing, and the second knife holder is assembled onto the outer circumferential surface of the knife rotor with the second bolt screwed into the second bolt hole. The second knife holder may be movable toward or away from the first knife holder via the eccentric portion by angularly rotating the position adjustment bushing.

[0017] Furthermore, the knives may be selectively attached to the outer peripheral surface of the knife rotor at positions spaced approximately 180° from each other in the circumferential direction via a pair of first and second knife holders, respectively. [Effects of the Invention]

[0018] In summary, the knife disposed between the opposing vertical wall surfaces of the first and second knife holders is attached in intimate contact only with the vertical wall surface of the first knife holder, while leaving a gap that allows slight inclination relative to the vertical wall surface of the second knife holder. A knife-side through-hole that passes through the first knife holder is provided at a position circumferentially closer to the knife side of the first bolt insertion hole of the first knife holder, and a screw member whose tip is pressed against the outer circumferential surface of the knife rotor is screwed into this knife-side through-hole.

[0019] Therefore, when the screw member threaded into the knife-side through-hole of the first knife holder is tightened to press the tip against the outer peripheral surface of the knife rotor, the first bolt insertion hole of the first knife holder in a position closer to the knife in the circumferential direction tends to lift up from the outer peripheral surface of the knife rotor, with the vicinity of the first bolt as a fulcrum. As a result, simply by tightening the screw member, the cutting edge of the knife, which is in close contact with the vertical wall surface of the first knife holder, can be tilted upward relative to the direction of rotation of the knife rotor, making it possible to easily change the cutting angle of the knife cutting edge relative to the material to be cut depending on the type of material to be cut and the area where uneven cutting occurs.

[0020] To address this issue, a counter-knife-side through-hole that passes through the first knife holder is provided at a position circumferentially closer to the first bolt insertion hole than the first knife holder toward the anti-knife side, and a screw member whose tip presses against the outer circumferential surface of the knife rotor is screwed into this counter-knife-side through-hole. Therefore, when the screw member screwed into the counter-knife-side through-hole of the first knife holder is tightened to press the tip against the outer circumferential surface of the knife rotor, the position of the first bolt insertion hole of the first knife holder circumferentially closer to the anti-knife side tends to lift off from the outer circumferential surface of the knife rotor, with the vicinity of the first bolt acting as a fulcrum. This makes it possible to tilt the cutting edge of the knife, which is in close contact with the vertical wall surface of the first knife holder, in a direction that tilts it away from the rotational direction of the knife rotor, simply by tightening the screw member. This makes it possible to easily change the cutting angle of the knife cutting edge relative to the material depending on the type of material to be cut and the location where uneven cutting occurs.

[0021] Furthermore, a knife-side through hole and an anti-knife-side through hole that penetrate the first knife holder are provided at positions circumferentially closer to the knife than the first bolt insertion hole of the first knife holder and closer to the knife side than the first bolt insertion hole of the first knife holder, and a screw member whose tip presses against the outer peripheral surface of the knife rotor is screwed into the knife-side through hole and the anti-knife-side through hole, respectively. Therefore, when the screw member screwed into the knife-side through hole or the anti-knife-side through hole of the first knife holder is tightened to press the tip against the outer peripheral surface of the knife rotor, the position of the first bolt insertion hole of the first knife holder closer to the knife side than the first bolt side attempts to lift off from the outer peripheral surface of the knife rotor, with the vicinity of the first bolt as a fulcrum. As a result, by simply tightening either of the screw members, it is possible to tilt the cutting edge of the knife, which is in close contact with the vertical wall surface of the first knife holder, in a direction that rises or falls relative to the rotational direction of the knife rotor, and the cutting angle of the knife cutting edge relative to the material can be easily changed depending on the type of material to be cut and the location where uneven cutting occurs.

[0022] Furthermore, by applying a clamping screw as the screw member, the tip of which makes point or line contact with the outer peripheral surface of the knife rotor, only the tip makes point or line contact with the outer peripheral surface of the knife rotor, thereby increasing the pressing force on the outer peripheral surface of the knife rotor and preventing damage to the outer peripheral surface of the knife rotor when pressed.

[0023] Furthermore, forming the first knife holder into a generally block shape suppresses deformation of the first knife holder due to the tightening force applied when the first bolts inserted into the first bolt insertion holes are screwed into the first bolt holes on the outer peripheral surface of the knife rotor, thereby preventing warping or other problems from occurring on the vertical wall surface due to the tightening force applied when the first bolts are screwed, and effectively suppressing errors in the vertical wall surface of the first knife holder.

[0024] The second knife holder, which has a position adjustment bushing attached to its insertion hole via the eccentric portion, is assembled onto the outer circumferential surface of the knife rotor with the second bolt inserted into the through hole of the position adjustment bushing and screwed into the second bolt hole, and the second knife holder can be moved toward or away from the first knife holder via the eccentric portion by rotating the position adjustment bushing angularly. This makes it possible to adjust minute gaps between the knife and the vertical wall surface by moving the second knife holder.

[0025] Furthermore, by selectively attaching knives via first and second knife holders at positions approximately 180° apart in the circumferential direction on the outer circumferential surface of the knife rotor, the material can be cut twice per rotation of the knife rotor, thereby improving productivity when cutting short materials without increasing the speed of the knife rotor. Moreover, because the knife holders are provided at positions approximately 180° apart in the circumferential direction, two types of knives with different thicknesses can be selectively attached to one or the other depending on the type of material, etc., making it easy to use different knives depending on the type of material, etc. [Brief explanation of the drawings]

[0026] [Figure 1] 1 is a schematic explanatory side view of a cutting machine having two rotary cutter devices according to an embodiment of the present invention mounted on a knife rotor. FIG. [Figure 2] FIG. 2 is a schematic explanatory view of the cutting machine of FIG. 1 as viewed from below. [Figure 3] FIG. 2 is a side view of the knife rotor of FIG. 1. [Figure 4] 4 is a vertical cross-sectional side view of a lower knife of the knife rotor of FIG. 3 cut in the vicinity of first and second bolts. [Figure 5] 5 is a bottom view of a part of the first knife holder of FIG. 4 in an untightened state of the screw members, as viewed from below. [Figure 6] 6 is a vertical cross-sectional side view of the first knife holder in FIG. 5 cut together with the second knife holder in the vicinity of the screw member. [Figure 7] FIG. 7 is a perspective view of a position adjusting bush provided in the second knife holder of FIG. 6. [Figure 8] 5A is a side view of the screw member of FIG. 4 as viewed from the side, and FIG. 5B is a front view of the screw member of FIG. 4 as viewed from the base end side. [Figure 9] FIG. 5 is an explanatory diagram showing a state in which the cutting angle of the knife blade edge is maintained at a standard angle without pressing the tips of the knife-side and anti-knife-side screw members of the first knife holder in FIG. 4 against the outer peripheral surface of the knife rotor. [Figure 10] FIG. 5 is an explanatory diagram showing a state in which only the tip of the screw member of the first knife holder in FIG. 4 on the anti-knife side is pressed against the outer peripheral surface of the knife rotor to adjust the cutting angle of the knife cutting edge to a narrower angle than the standard angle. [Figure 11] FIG. 5 is an explanatory diagram showing a state in which only the tip of the screw member of the first knife holder in FIG. 4 on the side opposite the knife is pressed against the outer peripheral surface of the knife rotor to adjust the cutting angle of the knife cutting edge to a wider angle than the standard angle. [Figure 12] 10 is an explanatory view showing a state in which the cutting angle of the knife blade edge is adjusted by pressing the two screw members in FIG. 9 against the outer peripheral surface of the knife rotor. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0027] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings to help understand the present invention. Note that the following embodiments are examples of specific embodiments of the present invention and are not intended to limit the technical scope of the present invention.

[0028] Fig. 1 is a schematic side view of a cutting machine having two rotary cutter devices according to an embodiment of the present invention mounted on a knife rotor. Fig. 2 is a schematic bottom view of the cutting machine shown in Fig. 1, and Fig. 3 is a side view of the knife rotor shown in Fig. 1.

[0029] First, a cutting machine equipped with a rotary cutter device according to an embodiment of the present invention will be described with reference to Figures 1 and 2. As shown in Figures 1 and 2, the cutting machine 1 includes a winding roller 11 around which a strip-shaped optical sheet S as an object to be cut is wound, a rotary cutter device 2 that cuts the optical sheet S from the winding roller 11, and a feed device 12 that is disposed between the winding roller 11 and the rotary cutter device 2 and feeds the optical sheet S from the winding roller 11 to the rotary cutter device 2.

[0030] The cutting machine 1 also includes a transport conveyor 14 that sequentially transports the optical films S1, S1 obtained by cutting the optical sheet S fed from the feed device 12 with the rotary cutter device 2 to the discharge side. In this case, the optical sheet S may be a polarizing film, a brightness enhancement film, a retardation film, or the like, which is to be attached to a substrate such as a liquid crystal panel.

[0031] The feed device 12 includes a pair of upper and lower feed rolls 15 and 16 that nip and feed the optical sheet S from the winding roller 11, and also includes an encoder (not shown) that measures the feed amount of the optical sheet S. In this case, a braking force is applied to the winding roller 11 so that an appropriate tension is applied to the optical sheet S fed by the feed device 12.

[0032] The rotary cutter device 2 includes a knife rotor 22 to which a knife 21 is attached, and a plain rotor 23 facing the knife rotor 22. The rotary cutter device 2 rotates the knife rotor 22 and the plain rotor 23 using a drive device (not shown), and cuts the optical sheet S, which has been fed in a aligned state by the feed device 12, into optical film S1 of a predetermined length.

[0033] 3, the knives 21 are attached to the outer peripheral surface of the knife rotor 22 at positions spaced 180° apart in the circumferential direction. In this case, the axial core lines of the feed rolls 15 and 16 of the feed device 12 are perpendicular to the feeding direction of the optical sheet S in a plan view, whereas the axial core line L of the knife rotor 22 is not perpendicular to the feeding direction of the optical sheet S in a plan view but is slightly inclined. By orthogonally ...

[0034] Similarly to the axial line L of the knife rotor 22, the axial line of the plain rotor 23 is not perpendicular to the feeding direction of the optical sheet S in plan view but is slightly inclined. Note that the knife rotor 22 is lightweight by evenly cutting off the tangents at both positions 90° apart in the circumferential direction from the mounting positions of the knives 21 on its outer circumferential surface at positions approximately 40% closer to the axial line L.

[0035] Each knife 21 is attached in a spiral shape to the outer circumferential surface of the knife rotor 22 via first and second knife holders 3 and 4, respectively, and cuts the optical sheet S between itself and the plain rotor 23. Since each knife 21 has the same configuration, the following description will focus on the knife 21 located below the outer circumferential surface of the knife rotor 22 in FIG. 3.

[0036] Figure 4 shows a vertical cross-sectional side view of the lower knife 21 of the knife rotor 22 of Figure 3, cut near the first and second bolts. As shown in Figure 4, the first and second knife holders 3, 4 are formed in the shape of flat, thick, and generally blocks so that facing portions 30, 40 facing the outer peripheral surface of the knife rotor 22 abut against the outer peripheral surface of the knife rotor 22 over almost the entire area, and are attached to the outer peripheral surface of the knife rotor 22 by a plurality of first and second bolts 31, 41. Each of the first and second bolts 31, 41 has a cylindrical head 311, 411 and a screw shank 312, 412 extending from the head 311, 411, and a hexagonal hole (not shown) is formed in the top surface (the underside in Figure 4) of each head 311, 411 so that a hexagonal wrench can be fitted therein.

[0037] The first and second knife holders 3, 4 extend spirally together with the knives 21 over the entire axial length of the knife rotor 22, and hold the knives 21 over the entire axial length of the knife rotor 22. In this case, the outer peripheral surface of the knife rotor 22 is curved such that both circumferential ends are spaced apart from the substantially flat opposing surfaces of the opposing portions 30, 40 that face the outer peripheral surface of the knife rotor 22.

[0038] Fig. 5 is a bottom view of a part of the first knife holder 3 of Fig. 4 when the screw members are not tightened, as viewed from below, and Fig. 6 is a longitudinal cross-sectional side view of the first knife holder 3 of Fig. 5 taken along with the second knife holder 4 near the screw members. As shown in Fig. 5, among the recesses 37, 37, ... (described later) of the first knife holder 3, slits 38 extending in the circumferential direction of the knife rotor 22 are provided between adjacent recesses 37, 37 in the longitudinal direction.

[0039] Each slit 38 is cut out from a substantially circular through-hole at a position close to the knife 21 side of the first knife holder 3 to the end opposite the knife 21. When the first knife holder 3 is fixed to the knife rotor 22, adjacent fixing portions 39, 39 sandwiching the slit 38 bend toward each other so that the lower surfaces of the fixing portions 39 (the lower surfaces of adjacent recesses 37, 37) fit along the outer peripheral surface of the knife rotor 22.

[0040] Meanwhile, between adjacent recesses 44, 44 in the longitudinal direction of the second knife holder 4 among the recesses 44, 44, ... (described later), slits 48 extending in the circumferential direction of the knife rotor 22 are provided. Each slit 48 is cut out from a substantially circular through-hole at a position close to the knife 21 side of the second knife holder 4 to the end opposite the knife 21. When the second knife holder 4 is fixed to the knife rotor 22, adjacent fixing portions 49, 49 sandwiching the slit 48 bend toward each other so that the lower surfaces of the fixing portions 49 (the lower surfaces of adjacent recesses 44, 44) fit along the outer circumferential surface of the knife rotor 22.

[0041] As shown in Figure 6, the knife 21 is interposed in the gap between the opposing vertical wall surfaces 32, 42 of the circumferential knife side end (the right end in Figures 4 and 6) of the first knife holder 3 and the circumferential knife side end (the left end in Figures 4 and 6) of the second knife holder 4, and is attached in a state of intimate contact only with the vertical wall surface 32 of the first knife holder 3. The vertical wall surface 32 of the first knife holder 3 is provided with a recessed groove 33 extending in the longitudinal direction of the first knife holder 3.

[0042] A permanent magnet 34 is housed in the groove 33, and the knife 21 interposed between the vertical wall surfaces 32, 42 of the first and second knife holders 3, 4 is attracted to the permanent magnet 34, so that the knife 21 is held in close contact with the vertical wall surface 32 of the first knife holder 3. The cutting edge of the tip of the knife 21 is formed at an angle of 30°, and is inclined at a cutting angle of 15° with respect to the vertical wall surface 32 of the first knife holder 3. In this case, the vertical wall surface 32 of the first knife holder 3 with the permanent magnet 34 housed in the groove 33 is formed almost flat, and the knife 21, which is less than 1 mm thick, is held in close contact with it by magnetic force.

[0043] A positioning protrusion 35 protruding toward the knife rotor 22 (upward in FIGS. 4 and 6) is integrally formed on the circumferential end of the first knife holder 3 opposite the knife rotor 22 (the right end in FIGS. 4 and 6) over the entire axial length of the knife rotor 22. The knife rotor 22 is provided with a spiral fitting groove 24 over the entire axial length of the knife rotor 22, into which the positioning protrusion 35 protruding from the circumferential end of the first knife holder 3 opposite the knife rotor 22 is fitted. In this case, the fitting groove 24 is formed in a bow shape that is slightly deflected in the circumferential direction with respect to the axial line L of the knife rotor 22 in plan view, so that the first and second knife holders 3, 4 and the knives 21 are arranged spirally on the outer circumferential surface of the knife rotor 22 in plan view.

[0044] The first knife holder 3 is also provided with a plurality of first bolt insertion holes 36, 36, ..., through which the respective first bolts 31 are inserted, at predetermined intervals (e.g., 50 mm intervals) in the longitudinal direction. The inner diameter of each first bolt insertion hole 36 is slightly larger than the outer diameter of the threaded shank 312 of the first bolt 31, so that the fixed position of the first knife holder 3 relative to the knife rotor 22 can be slightly adjusted when the first knife holder 3 is fastened with the bolt. Each first bolt insertion hole 36 is also formed with a smaller diameter than a recess 37 formed in the opposite surface of the facing part 30 of the first knife holder 3, and the bottom of this recess 37 penetrates toward the outer peripheral surface of the knife rotor 22. The head 311 of the first bolt 31 inserted into the first bolt insertion hole 36 is engaged in the bottom of each recess 37.

[0045] Furthermore, first bolt holes 25 are provided on the outer peripheral surface of the knife rotor 22, into which the first bolts 31 inserted into the first bolt insertion holes 36 are screwed. The first knife holder 3 is fixed to the outer peripheral surface of the knife rotor 22 by fitting the positioning protrusions 35 into the fitting grooves 24 of the knife rotor 22 and screwing the first bolts 31 inserted through the first bolt insertion holes 36 into the first bolt holes 25 of the knife rotor 22. In this case, the first bolt holes 25 are also provided at predetermined intervals in the longitudinal direction (for example, at intervals of 50 mm) and are formed toward approximately the center of the knife rotor 22.

[0046] Figure 7 is a perspective view of a position adjustment bushing provided in the second knife holder 4 of Figure 6. As also shown in Figure 7, the second knife holder 4 is provided with insertion holes 43 (second bolt insertion holes) at predetermined intervals (for example, at intervals of 50 mm) in the longitudinal direction, through which the eccentric portions 51 of the position adjustment bushings 5 ​​that adjust the mounting position of the knife 21 are inserted.

[0047] Each insertion hole 43 circumferentially corresponds to one of the first bolt insertion holes 36 of the first knife holder 3. Each insertion hole 43 is formed with a smaller diameter than a recess 44 recessed in the opposing surface of the opposing part 40 of the second knife holder 4, and penetrates through the bottom of this recess 44 towards the outer circumferential surface of the knife rotor 22. In this case, the recess 44 is recessed up to the vicinity of the opposing surface 40 of the second knife holder 4.

[0048] Second bolt holes 26, into which second bolts 41 are screwed, are provided at predetermined intervals (for example, at intervals of 50 mm) in the longitudinal direction on the outer peripheral surface of the knife rotor 22. Each of these second bolt holes 26 is formed toward approximately the center of the knife rotor 22. A circular fitting hole 27, whose inner diameter is slightly larger than the inner diameter of the second bolt hole 26, is provided at the entrance of each second bolt hole 26. A fitting portion 57 provided at the tip of a position adjustment bushing 5 is fitted into each of these fitting holes 27.

[0049] The position adjusting bushing 5 is provided at its axial center with a through hole 52 through which the screw shank 411 of the second bolt 41 can be inserted, and a head fitting hole 53 located on the tip side (upper end side in FIG. 7) of the through hole 52 and into which the head 412 of the second bolt 41 fits. In addition, a rotation operation part 54 having a square outer shape when viewed from the base end side in the axial direction is provided around the outer periphery of the head fitting hole 53 in the position adjusting bushing 5.

[0050] On the outer periphery of the position adjustment bush 5 and below the rotation operating part 54, there are provided a cylindrical eccentric part 51 that is radially eccentric by approximately 1 mm from the central axis of the through hole 52, and a cylindrical fitting part 57 that is coaxial with the central axis of the through hole 52, sandwiching a circular flange part 55 that protrudes radially outward.

[0051] In addition, at positions closer to the knife side and closer to the anti-knife side of each first bolt insertion hole 36 of the first knife holder 3, a knife side through hole 61 and an anti-knife side through hole 62 are respectively provided which penetrate the first knife holder 3 toward approximately the center of the knife rotor 22.

[0052] Fig. 8(a) is a side view of the screw member of Fig. 4 as viewed from the side, and Fig. 8(b) is a front view of the screw member of Fig. 4 as viewed from the base end side. As shown in Fig. 8(a) and (b), clamping screws 63 as screw members whose tips press against the outer circumferential surface of the knife rotor 22 are screwed into the knife-side through-hole 61 and the anti-knife-side through-hole 62. Each clamping screw 63 has a screw shank 64 formed around its periphery and a metal ball 65 rotatably attached to the tip of the screw shank 64, and a hexagonal hole 66 is recessed in the base end surface of the screw shank 64 into which a hexagonal wrench can be fitted.

[0053] Here, the procedure for attaching the knife 21 to the knife rotor 22 will be described.

[0054] First, the first knife holder 3 is set on the outer peripheral surface of the knife rotor 22, and the positioning protrusion 35 of the first knife holder 3 is fitted into the fitting groove 24 of the knife rotor 22, and then the outer surface of this positioning protrusion 35 is abutted against the inner surface of the fitting groove 24.

[0055] Next, the first bolt 31 is inserted into the first bolt insertion hole 36 of the first knife holder 3, and the screw shank 312 of the first bolt 31 is screwed into the first bolt hole 25 of the knife rotor 22. By sequentially repeating this screwing operation of the first bolt 31 in the direction of the axial line L of the knife rotor 22, the first knife holder 3 is fixed in a spiral shape to the outer peripheral surface of the knife rotor 22.

[0056] Then, the second knife holder 4 is set on the outer peripheral surface of the knife rotor 22, the eccentric portion 51 of the position adjustment bush 5 is inserted into the insertion hole 87 of the second knife holder 4, and the mating portion 57 of the position adjustment bush 5 is fitted into the mating hole 27 of the knife rotor 22.

[0057] Then, the screw shank 412 of the second bolt 41 is inserted into the through hole 52 of the position adjustment bushing 5, and the inserted end is screwed into the second bolt hole 25 of the knife rotor 22. By repeating this screwing operation of the second bolt 41 sequentially in the direction of the axial line L of the knife rotor 22, the second knife holder 4 is fixed in a spiral shape to the outer circumferential surface of the knife rotor 22.

[0058] Thereafter, the knife 21 is inserted into the gap between the vertical wall surfaces 32, 42 of the first and second knife holders 3, 4, and the knife 21 is attracted to the permanent magnet 34 housed in the groove 33 in the vertical wall surface 32 of the first knife holder 3, and the base end (upper end in Figure 4) of the knife 21 is abutted against the outer peripheral surface of the knife rotor 22.

[0059] Thereafter, if necessary, fine adjustment is made to the first and second knife holders 3 and 4. Incidentally, the fine adjustment of either the first or second knife holders 3 and 4 may be made first or both may be made first.

[0060] Here, an example of a procedure for finely adjusting the first and second knife holders 3 and 4 will be described.

[0061] First, to fine-tune the second knife holder 4, the position adjustment bushing 5 is angularly rotated relative to the second bolt 41. As the position adjustment bushing 5 is angularly rotated, the opposing surface of the vertical wall surface 42 of the second knife holder 4 moves slightly toward or away from the vertical wall surface 32 of the first knife holder 3 via the eccentric portion 51. This allows fine adjustment of the clearance between the first knife holder 3 and the knife 21, and the movement of the second knife holder 4 makes it possible to adjust the minute clearance between the knife 21 and the vertical wall surface 42.

[0062] On the other hand, when fine-tuning the first knife holder 3, one of the clamping screws 63, 63 screwed into the knife-side through-hole 61 located circumferentially closer to the knife side of the first bolt insertion hole 36 of the first knife holder 3 and the anti-knife-side through-hole 62 located circumferentially closer to the anti-knife side is tightened.

[0063] Figure 9 is an explanatory diagram showing a state in which the cutting angle of the blade edge of the knife 21 is maintained at the standard angle without pressing the tips of the knife-side and anti-knife-side screw members of the first knife holder 3 in Figure 4 against the outer circumferential surface of the knife rotor 22. Figure 10 is an explanatory diagram showing a state in which only the tip of the knife-side screw member of the first knife holder 3 in Figure 4 is pressed against the outer circumferential surface of the knife rotor 22, thereby adjusting the cutting angle of the blade edge of the knife 21 to a narrower angle than the standard angle.

[0064] 11 is an explanatory diagram showing a state in which only the tip of the screw member of the first knife holder 3 on the anti-knife side in FIG. 4 is pressed against the outer peripheral surface of the knife rotor 22 to adjust the cutting angle of the blade edge of the knife 21 to a wider angle than the standard angle. Also, FIG. 12 is an explanatory diagram showing a state in which the two screw members in FIG. 9 are each pressed against the outer peripheral surface of the knife rotor 22 to adjust the cutting angle of the blade edge of the knife 21.

[0065] 9, the cutting angle of the blade edge of the knife 21 is inclined at approximately 75° (standard angle) with respect to the optical sheet S when the tips of the clamping screws 63, 63 screwed into the knife-side through-hole 61 and the anti-knife-side through-hole 62, respectively, are not pressed against the outer peripheral surface of the knife rotor 22. When the tip is pressed against the outer peripheral surface of the knife rotor 22 by tightening one of the clamping screws 63, the first bolt insertion hole 36 of the first knife holder 3 at a position closer to the knife side in the circumferential direction or at a position closer to the anti-knife side in the circumferential direction tends to rise up from the outer peripheral surface of the knife rotor 22, with the vicinity of the first bolt 31 as a fulcrum.

[0066] 10, the clamping screw 63 threaded into the anti-knife-side through-hole 62 of the first knife holder 3 is tightened to press the tip thereof against a position on the outer circumferential surface of the knife rotor 22 that is closer to the anti-knife side (the bottom of the fitting groove 24). This causes the anti-knife-side position of the first bolt insertion hole 36 of the first knife holder 3 to lift up from the outer circumferential surface of the knife rotor 22, using the vicinity of the first bolt 31 as a fulcrum, i.e., position P of the first bolt insertion hole 36 that is closer to the knife side in the circumferential direction. At this time, the cutting angle of the blade edge of the knife 21 that is in close contact with the vertical wall surface 32 of the first knife holder 3 is inclined upward relative to the rotation direction of the knife rotor 22, as shown by the two-dot chain line in FIG. 12, and becomes narrower than the standard angle with respect to the optical sheet S.

[0067] 11, the clamping screw 63 threaded into the knife-side through-hole 61 of the first knife holder 3 is tightened to press the tip of the clamping screw 63 against a position on the outer circumferential surface of the knife rotor 22 that is closer to the knife in the circumferential direction. This causes the position of the first bolt insertion hole 36 of the first knife holder 3 that is closer to the knife in the circumferential direction to try to lift up from the outer circumferential surface of the knife rotor 22, using the vicinity of the first bolt 31 as a fulcrum, that is, position Q of the first bolt insertion hole 36 that is closer to the knife in the circumferential direction than the knife side. At this time, the cutting angle of the blade edge of the knife 21 that is in close contact with the vertical wall surface 32 of the first knife holder 3 is inclined in the direction of inclination with respect to the rotation direction of the knife rotor 22, as also shown by the dashed-dotted line in FIG. 12, and becomes wider than the standard angle with respect to the optical sheet S.

[0068] In this way, by simply tightening the clamping screw 63 in either the knife-side through-hole 61 or the anti-knife-side through-hole 62 of the first knife holder 3, it is possible to tilt the cutting edge of the knife 21, which is in close contact with the vertical wall surface 32 of the first knife holder 3, in an upright or downward direction relative to the rotational direction of the knife rotor 22, and the cutting angle of the cutting edge of the knife 21 relative to the optical sheet S can be easily changed depending on the type of material to be cut and the area where uneven cutting occurs.

[0069] In addition, since a clamping screw 63 is used as a screw member, with the ball 65 at the tip making point contact with the outer peripheral surface of the knife rotor 22, only the ball 65 at the tip makes point contact with the outer peripheral surface of the knife rotor 22, which not only increases the pressing force against the outer peripheral surface of the knife rotor 22 but also prevents damage to the outer peripheral surface of the knife rotor 22 when pressed.

[0070] Furthermore, the facing portions 30, 40 (respective fixing portions 39, 49) of the first and second knife holders 3, 4 facing the outer peripheral surface of the knife rotor 22 are formed in a flat, thick, generally block shape so as to abut against the outer peripheral surface of the knife rotor 22 over almost the entire area, thereby suppressing deformation of the first and second knife holders 3, 4 due to the tightening force when the first and second bolts 31, 41 are screwed into the first and second bolt holes 25, 26 on the outer peripheral surface of the knife rotor 22. As a result, warping or the like does not occur in the vertical wall surfaces 32, 42 due to the tightening force when the first and second bolts 31, 41 are screwed, so that errors in the vertical wall surfaces 32, 42 of the first and second knife holders 3, 4 can be effectively suppressed and the gap between the vertical wall surfaces 32, 42 can be accurately secured.

[0071] The second knife holder 4, having a position adjustment bushing 5 attached to the insertion hole 43 via the eccentric portion 51, is assembled onto the outer circumferential surface of the knife rotor 22 with the second bolt 41 inserted into the through hole 52 of the position adjustment bushing 5 and screwed into the second bolt hole 26. The second knife holder 4 can be moved toward or away from the first knife holder 3 via the eccentric portion 51 by angularly rotating the position adjustment bushing 5. This makes it possible to adjust minute gaps between the knife 21 and the vertical wall surface 42 by moving the second knife holder 4.

[0072] Furthermore, since the knives 21 are attached via the first and second knife holders 3 and 4 at positions spaced approximately 180° apart in the circumferential direction on the outer peripheral surface of the knife rotor 22, the optical sheet S can be cut twice per rotation of the knife rotor 22, thereby improving productivity when cutting a short optical film S1 without increasing the speed of the knife rotor 22. Moreover, since the knife holders 3 and 4 are provided at positions spaced approximately 180° apart in the circumferential direction, two types of knives with different thicknesses can be selectively attached to one or the other depending on the type of material to be cut, making it easy to choose the knife to use depending on the type of material to be cut.

[0073] It should be noted that the present invention is not limited to the present embodiment and includes various other modified examples. For example, in the present embodiment, the clamping screws 63 are screwed into the knife-side through-hole 61 and the anti-knife-side through-hole 62 of the first knife holder 3, but the first knife holder may be provided with only the anti-knife-side through-hole, into which the clamping screw is screwed.

[0074] In this case, when the clamping screw is tightened and its tip presses against a position on the outer circumferential surface of the knife rotor that is closer to the knife in the circumferential direction, that position tends to lift up, tilting the knife cutting edge in a direction that rises relative to the rotation direction of the knife rotor, and oriented at a narrower angle than the standard angle relative to the optical sheet. For this reason, by tilting the vertical wall surface of the first knife holder with which the knife comes into close contact in advance in a direction that falls relative to the rotation direction of the knife rotor, and oriented at a wider angle than the standard angle relative to the optical sheet, it becomes possible to tilt the vertical wall surface of the first knife holder only in a direction that rises relative to the rotation direction of the knife rotor, and change the cutting angle of the knife cutting edge relative to the optical sheet to a narrower angle than the standard angle.

[0075] Alternatively, the first knife holder may be provided with only a knife-side through-hole, into which a clamping screw is threaded. In this case, when the clamping screw is tightened and its tip presses against a position on the outer circumferential surface of the knife rotor that is closer to the knife in the circumferential direction, that position tends to lift, tilting the knife cutting edge in a direction that tilts it relative to the rotation direction of the knife rotor, resulting in a wider angle relative to the optical sheet than the standard angle. Therefore, by previously tilting the vertical wall surface of the first knife holder, with which the knife is in close contact, in a direction that tilts it relative to the rotation direction of the knife rotor, thereby setting the angle relative to the optical sheet narrower than the standard angle, it becomes possible to tilt the vertical wall surface of the first knife holder only in a direction that tilts it relative to the rotation direction of the knife rotor, thereby changing the cutting angle of the knife cutting edge relative to the optical sheet to a wider angle than the standard angle.

[0076] In this embodiment, the knife 21 is used with a cutting edge at an angle of 30°. Formed in the range of 25° to 30° A sharp knife may be used.

[0077] In addition, in this embodiment, Although the clamping screw 63 is used as a screw member, a swivel screw may be used. A screw member such as a bolt having a screw shank formed around its periphery may be used. In this case, it is preferable that the tip of the screw be flat and processed to have a degree of freedom of rotation, in consideration of damage that may occur when the outer peripheral surface of the knife roller is pressed against the screw member.

[0078] Furthermore, in this embodiment, the second bolt 41 is inserted into the insertion hole 43 of the second knife holder 4 via the eccentric portion 51 of the position adjustment bush 5, which adjusts the mounting position of the knife 21. However, if the second knife holder can be fixed with the second bolt without adjusting the mounting position of the knife by the second knife holder on the outer peripheral surface of the knife rotor, there is no need to interpose the eccentric portion of the position adjustment bush when fixing with each second bolt 41.

[0079] Furthermore, in this embodiment, the case where the optical sheet S is cut has been described, but it goes without saying that the present invention can also be applied to the case where an object to be cut, such as paper, is cut. [Explanation of symbols]

[0080] 1 Rotary cutter device 21 Knife 22 Knife rotor 23 Plain rotor 24 Fitting groove 25 First bolt hole 26 Second bolt hole 3 First knife holder 30 Opposite part of first knife holder 31 First Bolt 32 Vertical wall of first knife holder 35 Positioning protrusion 36 First bolt insertion hole 4 Second knife holder 40 Opposite part of second knife holder 41 Second bolt 42 Vertical wall of second knife holder 43 Insertion hole (second bolt insertion hole) 5 Position adjustment bush 51 Eccentric part 52 Through hole 61 Knife side through hole 62 Anti-knife side through hole 63 Clamping screw (screw member) S Optical sheet (object to be cut)

Claims

1. A rotary cutter device comprising: a knife rotor; knives attached in a spiral shape to an outer peripheral surface of the knife rotor via a pair of first and second knife holders in the circumferential direction; and a plain rotor facing the knife rotor, wherein the rotary cutter cuts a sheet-like material between the knife and the plain rotor, The first knife holder is provided with a first bolt insertion hole and a positioning protrusion that can be fitted into a fitting groove formed in the outer peripheral surface of the knife rotor, and the first knife holder is fixed to the outer peripheral surface of the knife rotor by fitting the positioning protrusion into the fitting groove and screwing a first bolt inserted into the first bolt insertion hole into a first bolt hole formed in the outer peripheral surface of the knife rotor, a second bolt insertion hole is formed in the second knife holder, and a second bolt inserted into the second bolt insertion hole is screwed into a second bolt hole formed in the outer peripheral surface of the knife rotor, thereby fixing the second knife holder to the outer peripheral surface of the knife rotor; the knife is provided between the opposing vertical wall surfaces of the first and second knife holders, and is attached in a state of being in close contact with only the vertical wall surface of the first knife holder, while being accommodated with a gap that allows slight inclination relative to the vertical wall surface of the second knife holder; a knife-side through-hole that passes through the first knife holder is provided at a position closer to the knife in the circumferential direction of the first bolt insertion hole of the first knife holder, and a screw member whose tip is pressed against the outer peripheral surface of the knife rotor is screwed into this knife-side through-hole,

2. A rotary cutter device includes a knife rotor, knives attached in a spiral shape to an outer peripheral surface of the knife rotor via a pair of first and second knife holders in the circumferential direction, and a plain rotor facing the knife rotor, and cuts a sheet-like material between the knife and the plain rotor, The first knife holder is provided with a first bolt insertion hole and a positioning protrusion that can be fitted into a fitting groove formed in the outer peripheral surface of the knife rotor, and the first knife holder is fixed to the outer peripheral surface of the knife rotor by fitting the positioning protrusion into the fitting groove and screwing a first bolt inserted into the first bolt insertion hole into a first bolt hole formed in the outer peripheral surface of the knife rotor; a second bolt insertion hole is formed in the second knife holder, and a second bolt inserted into the second bolt insertion hole is screwed into a second bolt hole formed in the outer peripheral surface of the knife rotor, thereby fixing the second knife holder to the outer peripheral surface of the knife rotor; the knife is provided between the opposing vertical wall surfaces of the first and second knife holders, and is attached in a state of being in close contact with only the vertical wall surface of the first knife holder, while being accommodated with a gap that allows slight inclination relative to the vertical wall surface of the second knife holder; a rotary cutter device characterized in that a counter-knife side through-hole that passes through the first knife holder is provided at a position circumferentially closer to the counter-knife side of the first bolt insertion hole of the first knife holder, and a screw member whose tip is pressed against the outer peripheral surface of the knife rotor is screwed into this counter-knife side through-hole.

3. A rotary cutter device includes a knife rotor, knives attached in a spiral shape to an outer peripheral surface of the knife rotor via a pair of first and second knife holders in the circumferential direction, and a plain rotor facing the knife rotor, and cuts a sheet-like material between the knife and the plain rotor, The first knife holder is provided with a first bolt insertion hole and a positioning protrusion that can be fitted into a fitting groove formed in the outer peripheral surface of the knife rotor, and the first knife holder is fixed to the outer peripheral surface of the knife rotor by fitting the positioning protrusion into the fitting groove and screwing a first bolt inserted into the first bolt insertion hole into a first bolt hole formed in the outer peripheral surface of the knife rotor; a second bolt insertion hole is formed in the second knife holder, and a second bolt inserted into the second bolt insertion hole is screwed into a second bolt hole formed in the outer peripheral surface of the knife rotor, thereby fixing the second knife holder to the outer peripheral surface of the knife rotor; the knife is provided between the opposing vertical wall surfaces of the first and second knife holders, and is attached in a state of being in close contact with only the vertical wall surface of the first knife holder, while being accommodated with a gap that allows slight inclination relative to the vertical wall surface of the second knife holder; A rotary cutter device characterized in that a knife-side through hole and an anti-knife-side through hole that pass through the first knife holder are provided at positions circumferentially closer to the knife side and anti-knife side of the first bolt insertion hole of the first knife holder, respectively, and that a screw member whose tip is pressed against the outer peripheral surface of the knife rotor is screwed into each of these knife-side through holes and anti-knife-side through holes.

4. 4. The rotary cutter device according to claim 1, wherein the screw member is a clamping screw whose tip comes into point contact or line contact with the outer peripheral surface of the knife rotor.

5. 4. The rotary cutter device according to claim 1, wherein the first knife holder is formed in a generally block shape such that a portion of the first knife holder facing the outer peripheral surface of the knife rotor abuts against the outer peripheral surface of the knife rotor over almost the entire area.

6. the second knife holder is provided with an insertion hole for an eccentric portion provided in a position adjustment bush, 4. The rotary cutter device according to claim 1, wherein the position adjustment bush is attached to the insertion hole via the eccentric portion, the second bolt is inserted into a through hole provided in the position adjustment bush, the second bolt is screwed into the second bolt hole, and the second knife holder is assembled to the outer peripheral surface of the knife rotor with the second bolt being screwed into the second bolt hole, and the second knife holder can be moved toward or away from the first knife holder via the eccentric portion by angularly rotating the position adjustment bush.

7. The rotary cutter device according to any one of claims 1 to 3, wherein the knives are selectively attached via a pair of first and second knife holders circumferentially spaced approximately 180° apart from each other on the outer peripheral surface of the knife rotor.

Images