JP2016055419A - Rotary die cutter unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance productivity, by shortening a replacing time of a die roll and an anvil roll, on a rotary die cutter unit having the die roll and the anvil roll and cutting-out/processing a belt-like material.SOLUTION: A rotary die cutter unit 1 comprises an external frame 20 having high rigidity and an internal unit 30 having a die roll 31 and an anvil roll 32 closely adjacently provided so as to be rotatable, and comprises a structure attachable-detachable in the axial direction of both rolls from the external frame 20 by integrating the internal unit 30. The die roll 31 and the anvil roll 32 can also be easily replaced in a short time, and in addition, time for removing, installing and adjusting an auxiliary facility added to the rotary die cutter unit 1, can also be remarkably reduced.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a rotary die cutter unit capable of performing a cutting process such as a cutting with a roll on a workpiece passing between two rolls provided close to each other.

  Band-shaped members that combine paper, resin, cloth, and sometimes metal, such as sanitary napkins, sanitary items such as diapers, and medical items such as masks and disposable gloves, are mass-produced for that purpose. In many cases, a rotary cutter is often used for the cut-and-cut operation.

  Rotary type cutters simultaneously carry out the strip-shaped material to be cut out (hereinafter also referred to as “web”) and cut out at the same time. Compared to the case of using a vertical reciprocating cutting machine, for example. Thus, it is possible to cut out at higher speed.

  Rotary cutters have been put into practical use for a long time. A rotary cutter is a cutter that rotates two rolls provided close to each other in parallel to each other in opposite directions, presses the web passing between the two rolls, and cuts the web. One of the two rolls used is a roll (die roll) provided with a convex cutting blade provided in substantially the same shape as the cutting line of the web, and the other roll is a roll having a smooth cylindrical surface (anvil roll). The combination is often used. This method is classified as a rotary die cutter among the rotary cutters. The “cut-out process” is not limited to cutting the cut outline of the web, but includes a process of cutting a line, half-cutting, or inserting a broken line. In this specification, these processes may be called cutting processes. A set of cutting devices having a rotary die cutter is called a rotary die cutter unit.

  For example, Patent Document 1 discloses a rotary die cutter unit in which a convex cutting blade or an anvil roll surface is made of a hard material such as cemented carbide.

  The aforementioned rotary die cutter unit is already widely used, and various improvements such as the structure of the roll and the material and shape of the cutting edge have been made, and the life has been improved.

  When the die roll or anvil roll reaches the end of its life, the cutting edge of the die roll or the cylindrical surface of the anvil roll is re-polished. The regrinding operation takes at least a few days. Therefore, instead of having only one die roll and one anvil roll prepared for the cutting process of one production line, there are a plurality of rolls that can be replaced on the premise of their “re-grinding”. Has been made. During the re-polishing of the roll, the roll is replaced with another roll that is a spare, and production is continuously performed by repeating this.

  By the way, one of the impeding factors for increasing productivity is this roll exchange.

  Usually, as shown in FIG. 1 of Patent Document 2, the rotary die cutter unit has a frame having high rigidity as an outer shell, and is provided in close proximity to and parallel to the gap inside the frame. It has the structure which has the roll of. By having this structure, it is possible to prevent web cutting failure or chipping of the blade edge due to vibration during use.

  If this is a large device that cuts out adult diapers, for example, the weight of the roll and frame will be very heavy, and it is necessary to carefully attach and detach the upper part of the frame and detach the roll using a crane. Occurs. Further, as shown in FIG. 2, the rotary die cutter unit has a web feed conveyor 50, a guide 52 for adjusting the web feed positioning, dust removal and roll cooling in order to continuously perform web cutting. The air nozzle 53 and the vacuum device 51 for removing the waste (trim) are provided as peripheral devices. Therefore, when the roll of the rotary die cutter unit (one or both of the die roll and the anvil roll) is exchanged, the time required for attaching and detaching and adjusting the time occurs in addition to the roll exchange time. The time required for these series of roll exchanges takes about several hours if it is long.

  During this exchange, it is necessary to stop the line operation, which hinders improvement in productivity. Accordingly, there is a need for a rotary die cutter unit that can replace the roll in a shorter time. In addition to exchanging the worn roll, it is advantageous that the roll can be exchanged in a short time when it is desired to exchange a die roll having another cutting blade in order to obtain a workpiece having a different shape.

  FIGS. 11A and 11B show connection examples of the frame 101 and the roll holding unit 102. In the illustrated example, the roll holding part 102 has an opening as a bearing for receiving the axis of the roll.

  In general, the roll is attached to the frame 101 by attaching the roll holding unit 102 holding the roll to the frame 101. More specifically, one of the frame 101 and the roll holding unit 102 has a concave cross-sectional shape, and the other cross-sectional shape has a shape fitting therewith, and is fixed to each other. However, as shown in FIG. 11B, the roll holder 102 and the frame 101 are provided with a clearance 103 for facilitating fitting and sliding, and this width is generally 10 to 30 μm. Degree. This clearance width can be a horizontal positioning error that occurs when positioning the two rolls. Therefore, in the system in which the roll holding unit 102 holding the roll is fitted and fixed to the frame 101 from above, there may be a problem that it is difficult to sufficiently increase the positioning accuracy between the rolls.

  Patent Document 3 discloses a cartridge-type replacement blade technique. However, this technique does not give consideration to the exchange of heavy objects, and also considers devices arranged around the rotary cutter. Absent.

JP-A-11-188700 JP 2012-218148 A US Patent Application Publication No. 2003/0036468

  As described above, conventionally, there has been a problem in that the roll replacement of the rotary die cutter unit is time consuming and laborious and productivity is lowered. The present invention has been made in order to solve the above-described problems, and an object thereof is to shorten the time required for roll replacement of the rotary die cutter unit and the work associated therewith.

  A rotary die cutter unit according to an embodiment of the present invention is a rotary cutter unit that cuts a material to be cut using a cutting blade provided on a die roll, and is arranged on an external top plate arranged on the top and on a bottom. An external frame having an external bottom plate, at least one support member that fixes the external top plate and the external bottom plate, and an internal unit that is inserted into a space between the external top plate and the external bottom plate The internal unit is rotatably provided in an internal top plate disposed at the top, an internal bottom plate disposed at the bottom, and a gap between the internal top plate and the internal bottom plate. A die roll and an anvil roll provided rotatably in the vicinity of the die roll, and the internal unit is integrated with the external frame in the axial direction of the die roll. It is removable by.

  In one embodiment, the internal unit includes a pair of first roll holding plates provided on the internal top plate side and a pair of second roll holding plates provided on the internal bottom plate side, The first and second roll holding plates hold both ends of either the die roll or the anvil roll.

  In one embodiment, the first roll holding plate and the second roll holding plate are provided to face each other and are connected by at least one internal pillar.

  In one embodiment, at least one hole for inserting and holding the at least one internal pillar is formed in at least one of the first roll holding plate and the second roll holding plate. The hole and the internal pillar are positioned via a ball guide.

  In one embodiment, the apparatus further includes a plurality of internal pillars connecting the internal top plate and the internal bottom plate.

  In one embodiment, a pressurizing mechanism disposed on an upper surface of the external top plate, and a movable top plate that is movable between the external top plate and the internal top plate, the pressurizing mechanism includes A cutting load is applied between the die roll and the anvil roll through the movable top plate and the internal top plate.

  In one embodiment, a key-like groove member extending along the axial direction of the die roll on the lower surface side of the movable top plate, and the key-shaped groove member provided on the lower surface side of the movable top plate, In the axial direction of the die roll, the die roll has a width to be fitted.

  In one embodiment, a key-like groove member extending along the axial direction of the die roll is provided on the upper surface side of the outer bottom plate, and the key-like groove member provided on the upper surface side of the outer bottom plate is formed of the die roll. In the axial direction, it has a width that fits with the inner bottom plate.

  In one embodiment, the apparatus further comprises a pressure mechanism disposed on a lower surface of the external bottom plate, and a movable bottom plate movable between the external bottom plate and the internal bottom plate, wherein the pressure mechanism includes the movable bottom plate and the movable bottom plate. A cutting load is applied between the die roll and the anvil roll through the inner bottom plate.

  In one embodiment, a key-like groove member extending along the axial direction of the die roll on the lower surface side of the outer top plate, and the key-shaped groove member provided on the lower surface side of the outer top plate, In the axial direction of the die roll, the die roll has a width to be fitted.

  In one embodiment, the upper surface side of the movable bottom plate has a key-shaped groove member extending along the axial direction of the die roll, and the key-shaped groove member provided on the upper surface side of the movable bottom plate is the die roll. In the axial direction, the width fits with the inner bottom plate.

  In one embodiment, the at least one support member includes a plurality of external pillars spaced from each other between the external top plate and the external bottom plate.

  In one embodiment, the at least one support member includes a pair of plate members spaced from each other between the external top plate and the external bottom plate.

  In one embodiment, the pair of plate members are provided to face each other with the die roll interposed therebetween, and an opening for allowing the material to be cut to pass is formed in each of the pair of plate members. Yes.

  A rotary die cutter unit according to an embodiment of the present invention includes a first member, a second member provided to face the first member with a space therebetween, and between the first member and the second member. And at least two support members including a pair of support members provided at an interval, the first member, the second member, and the at least two support members. And a pair of rolls including an outer frame having an accommodation space defined by the first roll and a second roll disposed in close proximity to each other, wherein at least one of the first roll and the second roll A pair of rolls provided with cutting blades on one of the peripheral surfaces, and a pair of rolls disposed above or below the pair of rolls with a gap from the pair of rolls A member and a roll holding member fixed to the third member and rotatably supporting at least one of the pair of rolls, and the third member, the pair of rolls, and the roll holding member are integrated. An internal unit configured to be movable to the first unit, and integrally moving the internal unit along an axial direction of the pair of rolls to thereby move the first member and the second of the outer frame. The internal unit can be accommodated in the accommodation space without being interfered by a member and the at least two support members.

  As described above, the rotary die cutter unit according to the embodiment of the present invention typically includes an external frame and an internal unit that can be attached to and detached from the external frame by moving the roll in the axial direction (for example, horizontal movement). Is provided. The internal unit is detachable integrally as an internal unit in the gap of the external frame, and rotatably holds a die roll and an anvil roll provided in parallel in the vicinity of the internal unit. In this configuration, the roll can be replaced by pulling out the inner unit as a unit from the outer frame along the roll axis direction. In addition, the alignment between the die roll and the anvil roll can be performed independently with the internal unit removed from the external frame.

  The time for exchanging the roll of the rotary die cutter unit and the work associated therewith can be greatly reduced as compared with a rotary cutter having a conventional structure. Furthermore, it is possible to easily align the two rolls with high accuracy.

It is a schematic diagram of the rotary die cutter unit by an embodiment of the present invention. It is an example of a rotary die cutter unit and peripheral equipment. It is a schematic diagram of a lattice-shaped outer frame. It is a schematic diagram of an internal unit. It is a schematic diagram of an internal unit (the internal top plate and the internal bottom plate are connected by a roll holding plate and an internal column). It is a schematic diagram of the internal unit (internal top plate, internal bottom plate and internal pillar, and the internal top plate and internal bottom plate are connected). It is a perspective view which shows an example of attachment of a pressurization mechanism. FIG. 5 is a schematic side view in which a key-shaped groove is provided on the external top plate, and the internal top plate is a protrusion that fits into the groove, where (A) shows the internal unit and (B) shows the external frame. It is a typical side view of the space required in the case of roll replacement | exchange, (A) shows the rotary die cutter unit of a prior art, (B) shows the rotary die cutter unit by embodiment of this invention. It is a schematic perspective view which shows the one aspect | mode of mounting | wearing of the internal unit to an external frame. It is an example which fixes a roll support body to a flame | frame of a prior art, (A) is a perspective view which shows attachment, (B) is sectional drawing after attachment (a partial enlarged view enclosed with the circle is included). It is a figure for demonstrating the form of fixation of the roll support body to the external frame using a ball guide. It is a schematic diagram of the rotary die cutter unit by another embodiment of this invention, (A) and (B) are perspective views when it sees from another angle. FIG. 14 is a schematic perspective view showing one aspect of mounting of the internal unit to the external frame in the rotary die cutter unit according to the embodiment shown in FIG. 13. It is sectional drawing which shows typically the external frame with which the rotary die cutter unit by embodiment shown in FIG. 13 is provided. It is a diagram for explaining the area ratio S ₁ / S _0.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 shows a schematic diagram of a rotary die cutter unit according to an embodiment of the present invention.

  The rotary die cutter unit 1 shown in FIG. 1 includes an external frame 20 and an internal unit 30 that can be attached to and detached from the external frame 20 by moving in the axial direction of the roll. The internal unit 30 can be inserted into a gap inside the external frame 20, and rotatably holds a die roll 31 and an anvil roll 32 that are provided close to the unit and parallel to the axis. The internal unit 30 can be attached to and detached from the external frame 20 as a single unit.

  In FIG. 1, the dark gray portion is the internal unit 30, and the bright white portion is the external frame 20 and its attached devices.

  In the present embodiment, the internal unit 30 is integrally assembled outside the external frame 20 and is accommodated in the accommodation space of the external frame 20 by horizontally moving along the roll axis direction. Similarly, the internal unit 30 can be withdrawn from the accommodation space of the external frame 20 by horizontally moving along the roll axis direction. In this specification, horizontal movement does not mean only movement in a completely horizontal direction with respect to the ground surface, but movement in an oblique direction having a slight inclination or vertical movement for alignment. It goes without saying that it may include movement of directions. For example, horizontal movement in this specification includes movement along a direction having an angle within ± 30 ° with respect to the ground surface. Further, the horizontal movement may include a vertical movement that does not lift the internal unit to a height higher than the top of the external frame.

(About peripheral equipment of rotary die cutter unit)
As shown in FIG. 2, the rotary die cutter unit 100 that generally performs a large amount of web cutting processing has a web W feed conveyor 50, dust removal and roll cooling in order to continuously perform the web W cutting processing. Peripheral equipment such as an air nozzle (blower) 53 for removing the vacuum and a vacuum device 51 for removing a dregs (trim) are provided. The rotary die cutter unit 100 can realize continuous cutting at a high speed by operating peripheral equipment together with the internal unit 30. In order for all of these peripheral facilities to function properly, various adjustments such as an attachment process and an alignment process must be performed before using the rotary die cutter unit.

(External frame)
The outer frame will be described with reference to FIG. The external frame 20 has an external top plate 21 on the top surface and an external bottom plate 22 on the bottom surface, and a plurality of external pillars 23 for fixing them with a gap between the external top plate 21 and the external bottom plate 22. It has as a support member. The external column 23 may be a columnar shape, a square column or a plate column. Further, as in another embodiment to be described later, a plate-like or wall-like support member may be used instead of the external pillar 23.

  The outer top plate 21, the outer bottom plate 22, and the outer pillar 23 are arranged in a lattice shape, and a gap 28 for inserting an internal unit 30 described later is provided in these. The external frame 20 has a material and a thickness that can ensure high rigidity so as to maintain roll position accuracy and not impair the positional relationship of the roll due to load or weight. Further, the external frame 20 has a role of preventing vibration from being transmitted into the external frame 20 even if the apparatus vibrates during operation. If vibration is transmitted to each part, the web cannot be cut satisfactorily, resulting in uncut portions, or an impact is applied to the cutting edge 311 (FIG. 4) of the die roll 31 to cause chipping, which is not desirable. The external frame 20 does not need to be moved when replacing the roll.

(Internal unit)
The rotary die cutter unit 1 of the present embodiment has a removable internal unit 30 in a space 28 (a space surrounded by the external top plate 21, the external bottom plate 22, and the external pillar 23) of the external frame 20. .

  As shown in FIG. 4, in the internal unit 30, a die roll 31 and an anvil roll 32 that are provided in close proximity and in parallel are rotatably held. The internal unit 30 includes at least an internal bottom plate 34, an internal top plate 33, a pair of upper roll holding plates 35, a pair of lower roll holding plates 36, a die roll 31, and an anvil roll 32. Note that the expression “upper roll” and “lower roll” are used here because the positional relationship between the die roll and the anvil roll cannot be specified by the apparatus.

  An internal top plate 33 is disposed above the internal unit, and an internal bottom plate 34 is disposed below the internal unit. An upper roll holding plate 35 that holds an upper roll (one of a die roll and an anvil roll) is fixed to the internal top plate 33. A lower roll holding plate 36 that holds the lower roll (the other of the die roll and the anvil roll) is fixed to the inner bottom plate 34. The pair of upper roll holding plates 35 are fixed to the inner top plate 33 with a gap so as to sandwich the upper roll (here, the die roll 31). Similarly, the pair of lower roll holding plates 36 is fixed to the inner bottom plate 34 with a gap so as to sandwich the lower roll (here, the anvil roll 32). Note that the upper roll holding plate 35 and the lower roll holding plate 36 may be detachable from the inner top plate 33 and the inner bottom plate 34 in order to attach and detach the upper roll and the lower roll.

  The pair of upper roll holding plates 35 holds both ends of the roll located above the rotary die cutter unit using a bearing or the like. The pair of lower roll holding plates 36 uses bearings or the like to hold both ends of the roll located below the rotary die cutter unit.

  The internal top plate 33 and the upper roll holding plate 35 are connected to the internal bottom plate 34 and the lower roll holding plate 36 by an internal column 37 (FIGS. 5 and 6). As shown in FIG. 5, the inner column 37 may be a member that directly connects the inner top plate 33 and the inner bottom plate 34 (inner column 37B), or the upper roll holding plate 35 and the lower plate as shown in FIG. The roll holding plate 36 may be connected (internal pillar 37A).

  As shown in FIG. 12, the internal pillar 37 is preferably attached via a roll holding plate (35, 36) and a ball guide 38. The ball guide 38 may have a configuration in which a large number of rolling elements are embedded in a tubular holding body, and the center positions of the outer peripheral side and the inner surface side can be aligned with a clearance of approximately 0 μm. The ball guide 38 is fitted into a hole (internal column receiving portion 39) provided in the roll holding plate (35, 36), and the inner column 37A is fitted into the hole, thereby positioning the roll with extremely high accuracy. Can be performed.

  Further, a force acts in a direction in which the distance between the roll holding plates is reduced by arranging an elastic body such as a spring or rubber on the inner bottom portion of the inner column receiving portion 39 or arranging a spring around the inner column 37. It may have a configuration in which the distance between the roll holding plates (or the pressure between the rolls) is reduced only when (for example, when a force that pushes down the internal top plate works).

  The internal unit 30 can be integrally attached to and detached from the external frame 20. In this specification, “integrally” means that all members constituting the internal unit can be attached to and detached from the external frame 20 by a single operation so as to handle a single part. is there.

(Pressure mechanism)
When the web W is cut out, there is a method of intentionally applying a load other than the roll's own weight to the proximity portion (portion 11 shown in FIG. 2) of the two rolls to ensure the load (pressing) necessary for the cutting. It is often done. In the case of a rotary die cutter unit, a form is used in which a load is applied downward from the upper roll or upward from the lower roll. Since the external frame 20 has high rigidity, the load applied to the roll works appropriately as a pressure for cutting the web W sandwiched between the blade edge 311 of the die roll 31 and the anvil roll 32 surface.

  The load may be generated using any device, but as a most general configuration, a schematic diagram of a configuration in which the pressure cylinder 25 is provided above the upper roll is shown in FIG. As shown in FIG. 7, in the external frame 20, a movable top plate 27 that can move up and down, which is the length direction of the external pillar 23, is provided below the external top plate 21. The pressurizing cylinder 25 is fixed to the external top plate 21, and can generate a downward load to move the movable top plate 27 downward.

  In this configuration, with the pressure cylinder 25 unloaded, the internal unit 30 is inserted into the external frame 20, and the movable top plate 27 and the internal unit 30 (more specifically, using bolts or the like in this state). Secures the internal top plate 33). In this state, by increasing the pressure of the pressure cylinder 25, the pressure is transmitted via the movable top plate 27 and the inner top plate 33, and between the die roll 31 and the anvil roll 32 in the internal unit 30 (proximity portion 11). ) Can be applied to the web W with an appropriate clipping pressure.

  In addition, although the figure which provided the pressurization mechanism (pressurization cylinder) 25 above the upper roll was used as an explanatory example, you may provide a pressurization mechanism below a lower roll, and may give an upward load. In this case, a “movable bottom plate” is used between the inner bottom plate and the outer bottom plate instead of the movable top plate. The same applies to the following description. Further, FIG. 7 shows a diagram in which two pressure cylinders 25 are provided as a pressure mechanism, but one or a plurality of two or more pressure cylinders may be used. The rotary die cutter unit is not limited to the pressure cylinder 25, and may include various mechanisms that can change the distance between the rolls or the pressure acting between the rolls. For example, when the mass of the upper roll is sufficiently large, only a mechanism that can apply force in the direction of separating the rolls may be provided. In the above description, the configuration in which force is applied to the internal top plate 33 via the movable top plate 27 has been described. However, the pressurizing mechanism may have a configuration in which pressure is applied directly to the internal top plate 33. good.

(Fixing the internal unit)
The external frame 20 and the internal unit 30 may be fixed using the movable top plate 27 and the pressurizing mechanism as described above, but may be fixed by another method.

  For example, as shown in FIG. 8 (B), a key-like groove 24 (T slot) extending in the axial direction of the roll is provided on the lower surface of the movable top plate 27, and the internal top plate as shown in FIG. 8 (A). It is also possible to adopt a method in which 33 is formed into a protrusion 26 shape that fits and slides with the groove 24, and both are slid and aligned, and then fixed by bolting or the like. Similarly, it is also possible to provide a T slot in the outer bottom plate 22 and to fit the inner bottom plate 34 therewith. It is also possible to combine these.

  Although not shown, a protrusion 26 can be separately provided on the upper surface of the internal top plate 33 and can be fitted to the T slot 24. Similarly, the protrusion 26 may be provided below the inner bottom plate 34.

  Further, the T-slot, the structure of the protrusion that fits into the T-slot, and the aforementioned pressure mechanism may be provided in combination.

(Removal of internal unit)
The internal unit 30 can be easily attached to and detached from the external frame 20 as a single unit.

  First, a method for inserting the internal unit 30 will be described.

  When the internal unit 30 is fixed by pressurization (method using the pressurization mechanism described above), the pressurization mechanism 25 is unloaded and the movable top plate 27 is moved to the opposite side (upward) from the internal unit side 30. . A sufficient height for inserting the internal unit 30 is generated between the movable top plate 27 and the external bottom plate 22.

  In this state, the internal unit 30 side has already been re-polished (or new) and the two rolls (31, 32) have been mounted, and the alignment between the rolls has been completed by the internal pillar 37. Note that the rolls are positioned with high accuracy by using, for example, the axis alignment mechanism shown in FIG. 12 in an environment where the work is relatively easy before being assembled into the external frame 20.

  The internal unit 30 is inserted between the movable top plate 27 and the external top plate 21. The internal unit 30 can be inserted as a single unit, and can be easily installed in the accommodating space in the external frame 20 by horizontally moving the internal unit 30 along the axial direction of the roll. After insertion, the external frame 20 and the internal unit 30 are aligned by a clasp, positioning pins, bolts, or the like. Thereafter, the pressure mechanism 25 is operated to fix the internal unit 30 in the gap of the external frame 20.

  At this time, in the configuration of the present embodiment, peripheral devices that require adjustment and removal are limited. More specifically, in removing the conventional die roll and anvil roll, the entire gray portion shown in FIG. 9 (A) is moved in the axial direction of the roll, and work such as removal of the roll is performed. Therefore, after disassembling the external frame, it is necessary to remove and retreat all peripheral devices on the movement line (movement path) of the movement. Furthermore, since it is necessary to lift it with a crane, a sufficient space is also required above the rotary die cutter unit. On the other hand, in the case of the present embodiment, the two rolls 31 and 32 can be loaded only by moving the smaller internal unit 30 shown as a gray portion in FIG. 9B along the axial direction of the roll. Therefore, the number of peripheral devices that need to be removed and retracted can be greatly reduced. For example, since the web feeding mechanism and the guide mechanism are usually provided at positions facing the circumferential surface of the roll, it does not interfere with the movement of the internal unit 30 in the roll axis direction and is not required to be removed. Or you only need to evacuate it slightly. Moreover, since it is not necessary to lift the roll, it is possible to work in a smaller space.

Assuming that the projected area of the rotary die cutter unit that interferes with the peripheral device viewed from the axial direction of the roll is S ₀ , of which the projected area of the internal unit 30 is S ₁ ,
0.4 ≦ S ₁ / S ₀ ≦ 0.8
More preferably, 0.4 ≦ S ₁ / S ₀ ≦ 0.6 so as to satisfy
If the internal unit is configured so as to satisfy the above requirements, the work time required for removing and attaching peripheral devices, and the work space and the space for unloading devices necessary for attachment and detachment can be sufficiently reduced.

Here, the projection area S ₀ that interferes with the peripheral device may be, for example, the area of the gray portion shown in FIG. 16B corresponding to the entire apparatus including the internal unit 30 and the external frame 20. The projected area S ₁ of the internal unit 30 is the area of the gray portion shown in FIG. In the example shown in FIGS. 16A and 16B, S ₁ / S ₀ is 0.4.

  The same applies to the case of using the internal top plate 33 in the shape of the groove (T slot) 24 and the protrusion 26 (33). The internal unit 30 can be inserted into the external frame 20 by aligning the internal unit 30 to the height at which the groove 24 and the internal top plate 33 are fitted, and pushing it in the axial direction of the roll along the groove 24 as it is. After loading, the axial alignment of the rolls of the external frame 20 and the internal unit 30 is performed by a clasp, a bolt, or the like. Thereafter, the pressure mechanism 25 is operated to fix the internal unit 30 in the external frame 20.

  After the above operations, a few peripheral devices that have been removed and moved are mounted and adjusted.

  In FIG. 10, the schematic diagram of the insertion of the internal unit 30 is shown.

  First, in a state where the pressure mechanism 25 is unloaded, the internal unit 30 is moved horizontally along the axial direction of the roll, and inserted into the gap portion of the external frame 20. In this state, positioning in the roll axis direction is performed using pins, bolts, and the like, and the movable top plate 27 and the internal top plate 33 are fixed using the bolts. Similarly, the outer bottom plate 22 and the inner bottom plate 34 are fixed. In this way, with respect to the outer frame 20 and the inner unit 30 that have been fixedly positioned, the pressure cylinder 25 is operated to bring the cutting edge 311 of the die roll 31 and the cylindrical side surface of the anvil roll 32 closer to a distance suitable for cutting.

  Next, a method for removing the internal unit 30 will be described.

  First, in the axial direction of the roll, peripheral devices on the flow line in which the internal unit 30 moves are removed or retracted.

  When both are fixed by the pressurizing mechanism 25, the pressurizing mechanism 25 is unloaded, and the movable top plate 27 that pressurizes the internal top plate 33 is retracted upward. With the movable top plate 27 and the inner top plate 33 in a non-contact state, the clasps and bolts that have been positioned are removed. In this state, the internal unit 30 is pulled out toward the front side in the axial direction of the roll, and the removal is completed.

  Hereinafter, more specific examples will be described.

  In this embodiment, the rotary die cutter unit uses the above-described movable top plate, pressurizing mechanism, groove provided on the lower surface of the movable top plate, and an internal top plate that fits into the groove, and the cutout portion has a thickness of 0.01. The example which cut out the sanitary napkin which consists of a 0.05 mm nonwoven fabric sheet is shown. The cut-out portion of the nonwoven fabric is made of polyethylene and polypropylene.

(Construction)
Carbon steel (S45C) was used as the material for the lattice-shaped outer frame 20 and the inner unit 30.

  As shown in FIG. 2, around the rotary die cutter unit, there are a conveyor 50 for transporting the web to the cutting position, a web guide 52 for cutting the web in a straight state, and a trim discharging device 51 for collecting the cut out scraps. In addition, an air nozzle 53 that ejects air for dust removal and roll cooling is provided.

  As shown in FIGS. 1 and 7, the external frame 20 includes an external top plate 21, an external bottom plate 22, and four columnar external pillars 23. Further, below the external top plate 21, there is a movable top plate 27 that can move along the external pillar 23 only in the vertical direction. The external top plate 21 has a pressurizing cylinder 25 at the top thereof, and can pressurize the internal unit 30 from above via a movable top plate 27. The pressurizing cylinder 25 may be connected to the movable top plate 27 via a connecting portion that penetrates a hole provided in the external top plate 21. Further, the outer top plate 21 includes a trim discharge device 51 at the center thereof. The outer bottom plate 22 has a pair of key-shaped grooves (T slots) 24 on its upper surface. The groove 24 has a shape that can be fitted and fixed to an internal bottom plate 34 described later.

  As shown in FIG. 4, the internal unit 30 includes an internal top plate 33, an internal bottom plate 34, a die roll 31 as an upper roll, an anvil roll 32 as a lower roll, a pair of die roll holding plates 35 that hold the die roll 31 at both ends, and an anvil. It has a pair of anvil roll holding plate 36 which hold | maintains the roll 32 at both ends. Between the anvil roll holding plate 36 and the die roll holding plate 35, there are a total of four cylindrical inner columns 37A, two on each side (see FIG. 6).

  On the cylindrical side surface of the die roll 31, a convex cutting edge 311 whose contour corresponds to the outer peripheral shape of the sanitary napkin is provided, and the web W is cut out according to the contour shape of the cutting edge 311.

  The inner top plate 33 and the die roll holding plate 35 are fixed, and the inner bottom plate 34 and the anvil roll holding plate 36 are fixed. The internal top plate 33 and the die roll holding plate 35, and the internal bottom plate 34 and the anvil roll holding plate 36 are each firmly fixed by a fastening member such as a bolt.

  Two internal pillars 37A are integrally fixed to the pair of die roll holding plates 35, respectively. The anvil roll holding plate 36 has an internal column receiving portion 39 at a position corresponding to the fixed internal column 37A (see FIG. 12). A ball guide 38 is fitted into the inner peripheral portion of the inner column receiving portion 39, and the inner diameter of the ball guide 38 has a diameter equivalent to that of the inner column 37A.

  The die roll 31 and the anvil roll 32 are rotated by a driving mechanism (not shown), and are cut between the blade edge 311 and the cylindrical side surface of the anvil roll 32 to press the blade edge 311 to cut the web.

(Preparation before installation)
In the internal unit 30, a pair of die roll holding plates 35 is fixed to the internal top plate 33, and a die roll 31 is rotatably held by the pair of die roll holding plates 35. A total of four internal pillars 37 </ b> A are connected to the pair of die roll holding plates 35.

  Further, the inner bottom plate 34 has a predetermined width in the web traveling direction, and can be fitted with a key-like groove (T slot) 24 provided in the outer bottom plate 22. The inner bottom plate 34 fixes a pair of anvil roll holding plates 36, and the pair of anvil roll holding plates 36 holds the anvil roll 32 rotatably.

  An internal column 37A connected to the die roll holding plate 35 is inserted into an internal column receiving portion 39 provided on the anvil roll holding plate 36 via a ball guide 38. Since the die roll holding plate 35 and the anvil roll holding plate 36 are finished with the same machine accuracy and are positioned via the ball guide 38, the positioning accuracy between the die roll 31 and the anvil roll 32 is extremely high. The positional accuracy between the die roll 31 and the anvil roll 32 was within ± 2 μm after 10 repetitions. This is remarkably high in accuracy compared with about ± 20 μm when the frame 101 and the roll holding part 102 have a mounting clearance 103 of several tens of μm as shown in FIGS. 11 (A) and 11 (B).

  In order to keep the distance between the inner top plate 33 and the inner bottom plate 34 when the pressurizing mechanism is not operating so that the cutting edge 311 and the cylindrical surface of the anvil 32 are not in contact with each other, a spring (not shown) is attached to the inner column 37A. Used around.

  The integrated internal unit 30 is completed with the drive belt and the like attached.

(Internal unit charging)
In the outer frame 20, the pressure cylinder 25 is unloaded. The movable top plate 27 was retracted upward so as not to interfere with the insertion of the internal unit 30. The integrated internal unit 30 is inserted in parallel with the axial direction of the roll by horizontally moving the groove 24 and the internal bottom plate 34 in a fitted state (see FIG. 10). At this time, the web feed guide 52 (FIG. 2) was retracted for setting to approach the die roll 31 to several mm. Other peripheral devices, such as the conveyor 50, the trim discharge device 51, and the air nozzle 53, may remain attached at the time of operation.

  After the internal unit 30 was inserted into the accommodating space in the external frame, the roll was positioned in the axial direction with positioning pins and bolts. Thereafter, the movable top plate 27 was lowered and brought into contact with the internal top plate 33. In this state, the movable top plate 27 and the internal top plate 33 were fixed using a bolt (not shown). Similarly, the outer bottom plate 22 and the inner bottom plate 34 were fixed.

  Subsequently, the pressure cylinder 25 is operated to push down the internal top plate 33, thereby pushing down the die roll 31 fixed via the internal top plate 33 and the die roll holding plate 35, and the cylindrical surfaces of the cutting edge 311 and the anvil roll 32. Were adjusted to obtain a distance or pressure suitable for cutting.

  Finally, the retracted web feed guide 52 is adjusted to a predetermined position, and the rotary die cutter unit 1 of this embodiment can be operated.

  In addition, when the parts to be moved at the time of charging are viewed from the axial direction of the roll, only the range of the internal unit 30 shown as a gray portion in FIG. Peripheral devices that do not fall within this range do not need to be evacuated when the internal unit 30 is loaded, and there is no need for readjustment during re-operation. On the other hand, in the case of the conventional rotary die cutter unit, in order to move the entire frame, it is necessary to evacuate and readjust all peripheral devices in the range shown as the gray portion in FIG. 9A. The area of the roll in the axial direction occupied by the internal unit 30 of the rotary die cutter unit 1 according to this example in the entire rotary die cutter unit was about 47%. The smaller this value is, the shorter the time required for evacuation and readjustment of peripheral devices can be.

(operation)
In operation, the sanitary napkin was cut out while conveying the object to be cut at a feed rate of 200 to 300 m / mm.

(removal)
The internal unit 30 was removed after use. At this time, the load applied at the time of mounting or operation by the pressure cylinder 25 was removed, the positioning pins and bolts were removed, and the movable top plate 27 was retracted upward. By this operation, a gap was generated between the movable top plate 27 and the internal top plate 33. With the web feed guide 52 retracted from the roll, the integral internal unit 30 was removed by pulling it out in the axial direction of the roll.

  In the above operation, if two internal units are prepared for each external frame, the time for stopping the production line is only the time for performing the operations described in “Internal unit loading” and “Removal”.

(Comparison with conventional technology)
For the conventional rotary die cutter unit and the rotary die cutter unit according to the embodiment of the present invention, the time when the production line was stopped was compared. The stopped time is defined as the time from when the rotary die cutter unit is stopped for roll replacement to when the re-polishing die roll and the anvil roll are replaced and restarted.

  First, in the conventional rotary die cutter unit, it is necessary to remove all of the peripheral devices such as the conveyor 50, the feed guide 52, the air nozzle 53, and the trim discharge device 51, which took 0.5 hours. Next, it took 0.3 hours to move the entire unit in the axial direction of the roll with a crane, remove the top plate, and remove the used roll. Subsequently, 0.5 hours were required for the work of charging a new die roll and anvil roll that had been reground. Furthermore, 1.5 hours were required for roll alignment and peripheral device adjustment.

  In the above work, the conventional configuration took 2.8 hours in total.

  In the case of the rotary die cutter unit 1 according to the embodiment of the present invention, it took 0.3 hours to remove the internal unit 30 after use. Next, it took 0.4 hours to load the internal unit 30 before use, which had a roll that had been re-polished, and was integrated with positioning.

  In the above operation, the configuration according to the embodiment of the present invention required 0.7 hours in total.

  Compared with the conventional technology, it was confirmed that the use of the rotary die cutter unit 1 according to the embodiment of the present invention can significantly reduce the line stop time during roll replacement.

  FIGS. 13A and 13B show a rotary die cutter unit 1A of another embodiment. FIGS. 13A and 13B are perspective views when viewed from opposite directions.

  Also in the present embodiment, the rotary die cutter unit 1A includes an external frame 20A and an internal unit 30 including upper and lower rollers. The internal unit 30 is detachable as a unit with respect to the external frame 20A. More specifically, by horizontally moving the internal unit 30 along the roll axis direction, the internal unit 30 can be accommodated in the accommodating space of the external frame 20A and can be fixed to the external frame 20A. The internal unit 30 may have the same configuration as the internal unit of the embodiment described above with reference to FIG. In the following, the same constituent members are denoted by the same reference numerals, and the description thereof may be omitted.

  Unlike the embodiment shown in FIG. 1, the rotary die cutter unit 1A of the present embodiment has an external frame 20A in which the external top plate 21 and the external bottom plate 22 are not external pillars but a pair of wall members (plate-like members). It is fixed by a support member 23A. The wall member 23 </ b> A is disposed on the side surface between the external top plate 21 and the external bottom plate 22. More specifically, the pair of wall members 23 </ b> A are provided on two side surfaces parallel to the roll axis direction of the internal unit 30 so as to face each other with the internal unit 30 (or the internal unit housing space) interposed therebetween. .

  In this configuration, as shown in FIG. 14, the internal unit 30 can be attached and detached integrally by moving the internal unit 30 in the axial direction of the roll through a portion (accommodating port) where the wall member 23A is not provided in the external frame 20A. is there.

  As shown in FIGS. 13 and 14, a hole 23N is provided in the center of the wall member 23A. By providing the holes 23N, the web can be continuously supplied between the upper and lower rollers through the holes 23N when performing the cutting process. The holes 23N are not limited to those shown in the drawings, and may be in various forms such as slit-shaped openings.

  As described above, when the plate-like support member 23A is used, the strength can be ensured even if it is designed to have a narrow width (thickness smaller than the diameter of the column) compared to the case where the external column 23 shown in FIG. 1 is used. . For this reason, the width of the frame can be made narrower and space saving can be realized. Further, it is possible to manufacture the frame using the plate-like support member 23A at a lower cost than the case where the external pillar is used.

  As shown in FIG. 15, also in the present embodiment, the internal unit 30 can be pressed by the pressurizing mechanism 25 via the movable top plate 27. In the present embodiment, the movable top plate 27 is provided at a position away from the wall member 23A. However, a hole provided in the external top plate 21 and a guide mechanism for the movable top plate 27 disposed on the inside thereof. By 27A, it is possible to move along the penetration direction (vertical direction) of the hole. The pressurizing mechanism 25 can press the movable top plate 27 downward by extending a push-down member 25A provided so as to penetrate the external top plate 21 downward.

  The rotary die cutter unit according to the embodiment of the present invention can be used as a general cutting device using a rotary die cutter unit for mass production. For example, it can be suitably used for cutting out webs such as non-woven fabrics, cloths, resin sheets, films and papers. These can be used to produce sanitary napkins, diapers, masks, gloves, filters, and the like.

DESCRIPTION OF SYMBOLS 1 Rotary die cutter unit 11 Die roll blade edge and proximity part of anvil roll outer peripheral surface 20 External frame 21 External top plate 22 External bottom plate 23 External pillar 24 Groove (T slot)
25 Pressure cylinder (Pressure mechanism)
26 Projection 27 Movable top plate 30 Internal unit 31 Die roll 311 Die roll cutting edge 32 Anvil roll 33 Internal top plate 34 Internal bottom plate 35 Upper roll holding plate 36 Lower roll holding plate 37A, 37B Internal column 38 Ball guide 39 Internal column receiving unit 50 Conveyor DESCRIPTION OF SYMBOLS 51 Trim discharging device, vacuum device 52 Web feed guide 53 Air nozzle 100 Rotary die cutter unit 101 Frame of conventional rotary die cutter unit 102 Roll holding part of conventional rotary die cutter unit 103 Frame and roll of conventional rotary die cutter unit Clearance of the holding part W Web (band-shaped material to be cut out)

Claims (15)

A rotary cutter unit that cuts a material to be cut using a cutting blade provided on a die roll,
An external frame having an external top plate disposed at the top, an external bottom plate disposed at the bottom, and at least one support member that fixes the external top plate and the external bottom plate;
An internal unit inserted in a space between the external top plate and the external bottom plate,
The internal unit includes an internal top plate disposed at the top, an internal bottom plate disposed at the bottom, a die roll rotatably provided in a gap between the internal top plate and the internal bottom plate, and the die roll An anvil roll provided rotatably in the vicinity of
The internal unit is a rotary die cutter unit that can be attached to and detached from the external frame integrally in the axial direction of the die roll. The internal unit has a pair of first roll holding plates provided on the internal top plate side and a pair of second roll holding plates provided on the internal bottom plate side,
The rotary die cutter unit according to claim 1, wherein each of the first and second roll holding plates holds both ends of either the die roll or the anvil roll.   The rotary die cutter unit according to claim 2, wherein the first roll holding plate and the second roll holding plate are provided to face each other and are connected by at least one internal pillar.   At least one hole for inserting and holding the at least one internal pillar is formed in at least one of the first roll holding plate and the second roll holding plate, and the hole The rotary die cutter unit according to claim 3, wherein the internal pillar is positioned via a ball guide.   The rotary die cutter unit according to claim 1 or 2, further comprising a plurality of internal pillars connecting the internal top plate and the internal bottom plate. A pressurizing mechanism disposed on an upper surface of the external top plate;
A movable top plate movable between the outer top plate and the inner top plate;
The rotary die cutter unit according to any one of claims 1 to 5, wherein the pressurizing mechanism applies a cutting load between the die roll and the anvil roll via the movable top plate and the internal top plate. A key-shaped groove member extending along the axial direction of the die roll on the lower surface side of the movable top plate;
The rotary die cutter unit according to claim 6, wherein the key-shaped groove member provided on the lower surface side of the movable top plate has a width that fits with the internal top plate in the axial direction of the die roll. A key-like groove member extending along the axial direction of the die roll on the upper surface side of the outer bottom plate;
The rotary die cutter unit according to claim 6 or 7, wherein the key-shaped groove member provided on the upper surface side of the outer bottom plate has a width that fits with the inner bottom plate in the axial direction of the die roll. A pressurizing mechanism disposed on the lower surface of the external bottom plate;
A movable bottom plate movable between the outer bottom plate and the inner bottom plate;
The rotary die cutter unit according to claim 1, wherein the pressurizing mechanism applies a cutting load between the die roll and the anvil roll through the movable bottom plate and the internal bottom plate. A key-like groove member extending along the axial direction of the die roll on the lower surface side of the external top plate,
The rotary die cutter unit according to claim 9, wherein the key-shaped groove member provided on the lower surface side of the external top plate has a width that fits with the internal top plate in the axial direction of the die roll. A key-like groove member extending along the axial direction of the die roll on the upper surface side of the movable bottom plate;
The rotary die cutter unit according to claim 9 or 10, wherein a key-shaped groove member provided on the upper surface side of the movable bottom plate has a width that fits with the internal bottom plate in the axial direction of the die roll.   The rotary die cutter unit according to any one of claims 1 to 11, wherein the at least one support member includes a plurality of external pillars spaced from each other between the external top plate and the external bottom plate. .   The rotary die cutter unit according to any one of claims 1 to 11, wherein the at least one support member includes a pair of plate members that are spaced from each other between the outer top plate and the outer bottom plate. .   The pair of plate members are provided to face each other with the die roll interposed therebetween, and an opening for passing the material to be cut is formed in each of the pair of plate members. The rotary die cutter unit described in 1. A first member, a second member provided to face the first member with a space therebetween, and at least two support members provided between the first member and the second member. An external frame having a housing space defined by the first member, the second member, and the at least two support members, and at least two support members including a pair of support members provided with a gap therebetween.
A pair of rolls including a first roll and a second roll that are arranged close to each other, and a cutting blade is provided on at least one of the first roll and the second roll. A pair of rolls, a third member disposed above or below the pair of rolls with a gap from the pair of rolls, and fixed to the third member, of the pair of rolls A rotary die having a roll holding member that rotatably supports at least one of the third member, the pair of rolls, and an internal unit configured to move the roll holding member integrally. A cutter unit,
By integrally moving the inner unit along the axial direction of the pair of rolls, the first unit, the second member, and the at least two support members of the outer frame are not interfered with, and A rotary die cutter unit capable of accommodating an internal unit in the accommodation space.

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