Cutting device

Abstract

Provided is a cutting device capable of preventing a sheet from folding or falling off after cutting. The cutting device (1) comprises: a rotating body (2); a holding portion (3) having a holding surface (3a1); an anvil (4) disposed between two adjacent holding portions (3); a cutter (5) for cutting a disposable diaper (50) between the cutter and an outer side (4b1) of the anvil (4) at a predetermined cutting position (P2); and a limiting component (6) disposed between the holding portion (3) and the anvil (4) for limiting the end of the disposable diaper (50) cut by the cutter from extending radially inward from the holding surface (3a1) of the holding portion (3) and contacting a circumferential side (3a4) when the anvil (4) rotates to the cutting position (P2).

Description

Technical Field

[0001] The present invention relates to a cutting device for conveying a sheet extending in a predetermined longitudinal direction along the longitudinal direction and cutting the sheet in a direction perpendicular to the longitudinal direction. Background Art

[0002] As such an apparatus, a production apparatus described in Patent Document 1 is known.

[0003] The manufacturing device described in Patent Document 1 includes: a rotating body capable of rotating around a rotating axis; a plurality of workpiece holding portions installed on the rotating body in a state of being arranged circumferentially around the rotating axis; a plurality of bearing blades installed on the rotating body in a state of being respectively arranged between two workpiece holding portions adjacent to each other in the circumferential direction; and a tool roller that cuts a continuous body (sheet body) of the absorbent body between the tool roller and the plurality of bearing blades.

[0004] The workpiece holding portion has a holding surface disposed radially outward of a circle centered on the rotation axis and a plurality of air suction holes formed on the holding surface and connected to a negative pressure source. The negative pressure source generates suction force on the holding surface for holding the absorbent body.

[0005] The continuous body of the absorbent body is delivered to the workpiece holding part at a predetermined position in the rotation direction around the rotation axis, and is transported by the rotation of the rotating body. In addition, the receiving blade moves sequentially to a position facing the cutter drum in accordance with the rotation of the rotating body, and the continuous body of the absorbent body is cut between the receiving blade and the cutter drum, thereby manufacturing the absorbent body.

[0006] In the device described in Patent Document 1, the continuous body of the absorbent body is held by a plurality of workpiece holding portions in a state of being subjected to tension. Therefore, if the continuous body of the absorbent body is cut by the cutter drum, the cut ends of the absorbent body are subjected to a pulling force toward the workpiece holding portion holding the absorbent body.

[0007] Here, a space is provided between the receiving blade and the workpiece holding portion in the circumferential direction, and the cut end of the absorbent body can freely move into the space with the contraction force generated by the blade. Furthermore, if the cut end of the absorbent body collides with the side surface of the workpiece holding portion facing the circumferential direction, the impact may cause a part of the cut end of the absorbent body to be adsorbed to the workpiece holding portion in a folded state, or the absorbent body itself may be detached from the workpiece holding portion due to the large folded area.

[0008] Prior art literature

[0009] Patent Literature

[0010] Patent Document 1: Japanese Patent Application No. 5409454 Summary of the invention

[0011] An object of the present invention is to provide a cutting device capable of preventing a cut sheet from folding or falling off.

[0012] In order to solve the above technical problems, the first invention provides a cutting device, which transports a sheet extending along a long side direction along the long side direction and cuts the sheet along a direction orthogonal to the long side direction, the cutting device comprising: a rotating body, which can rotate along a specified rotation direction centered on a rotation axis; a plurality of holding parts, each having a holding surface, the holding surface facing outward in the radial direction of a circle centered on the rotation axis, and used to hold the sheet, the holding surface being installed on the rotating body in an arranged manner along a circumferential direction centered on the rotation axis; a plurality of anvils, respectively arranged between two holding parts adjacent to each other in the circumferential direction among the plurality of holding parts; a cutter, which is used as the The cutting position which is pre-set according to the position of the rotating body in the rotation direction is arranged to be able to correspond to the rotation of the rotating body in sequence to the outer side of each anvil facing the outer side in the radial direction, and cut the sheet body between the tool and the outer side; and a limiting component is arranged between a specific anvil among the multiple anvils and a one-side holding part, and the one-side holding part is one of the two holding parts located on both sides of the specific anvil, and when the specific anvil is rotated to the cutting position, the end of the sheet body cut by the tool is limited to extend from the holding surface of the one-side holding part to the inner side in the radial direction and contact the side facing the circumferential direction.

[0013] According to the present invention, it is possible to suppress the cut sheet from being folded over or falling off. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a front view of the cutting device according to the first embodiment of the present invention, in which only the upright plate of the fixing member is shown by imaginary lines, and the structure of the inner region in the radial direction of the support tube is omitted from illustration.

[0015] Figure 2 It means by Figure 1 The upper row shows an expanded view of the cutting device observed from the radial outside with the rotation axis as the center, and the disposable diaper is represented by an imaginary line, and the lower row is a diagram showing the state of the disposable diaper being processed in the upper row.

[0016] Figure 3 yes Figure 1 An enlarged view of the portion indicated by Ⅲ in the cutting device.

[0017] Figure 4 yes Figure 1 Sectional view along line IV-IV.

[0018] Figure 5 A cutting device according to a second embodiment of the present invention Figure 2 Quite a picture.

[0019] Figure 6 yes Figure 5 The disconnecting device shown is Figure 3 Quite a picture.

[0020] Figure 7 yes Figure 6 Ⅶ-Ⅶ line cross-sectional view. DETAILED DESCRIPTION

[0021] Embodiments of the present invention will be described with reference to the following drawings. The following embodiments are only specific examples of the present invention and do not limit the technical scope of the present invention.

[0022] Reference Figure 1 and Figure 2 The cutting device 1 of the first embodiment conveys a continuous body 50A (sheet body) of disposable diapers 50 extending in the longitudinal direction, and cuts the continuous body 50A in a direction perpendicular to the longitudinal direction to separate the disposable diapers 50. Figure 2 The structure of the disposable diaper 50 will be described.

[0023] The disposable diaper 50 includes a waist portion 50a disposed on the waist when worn, a crotch portion 50b extending from the front abdomen of the waist portion 50a to the back, and a side seal portion 50c joining the side ends of the front abdomen and the side ends of the back. The portion of the continuous body 50A of the disposable diaper 50 corresponding to a plurality of disposable diapers 50 is connected in the lateral direction (longitudinal direction) at its side ends.

[0024] The disposable diaper 50 includes a waist elastic member 50d for fastening the front abdomen and the back to the waist of the wearer, a body-fitting elastic member 50e for fitting the front abdomen and the back to the abdomen and buttocks of the wearer, and a leg elastic member 50f for fitting the crotch to the legs of the wearer. The waist elastic member 50d and the body-fitting elastic member 50e have a longitudinal direction ( Figure 2 On the one hand, the elastic member 50f for the leg has a longitudinal direction of the continuous body 50A and a width direction ( Figure 2 The elasticity of the device is determined by the following aspects:

[0025] The cutting device 1 conveys the continuous body 50A in the longitudinal direction while holding the continuous body 50A in a state where the elastic members 50d to 50f are stretched in the longitudinal direction. The cutting device 1 cuts the continuous body 50A in the width direction, rotates the cut disposable diaper 50 by 90 degrees, and delivers it to the downstream device. Figure 1 and Figure 2 The structure of the cutting device 1 will be described.

[0026] The cutting device 1 has: a receiving position P1 for receiving the continuum 50A from an upstream device (e.g., a device for forming the side seal portion 50c); a cutting position P2 for cutting the received continuum 50A along a direction orthogonal to its long side direction; and a delivery position P3 for delivering the cut disposable diaper 50 to a downstream device (e.g., a device for folding the disposable diaper 50).

[0027] The cutting device 1 conveys the continuous body 50A from the receiving position P1 to the cutting position P2 along its longitudinal direction, and transports the disposable diaper 50 from the cutting position P2 to the delivery position P3. Specifically, the cutting device 1 transports the continuous body 50A and the disposable diaper 50 along a predetermined rotation direction D1 centered on the rotation axis C1. In addition, the cutting device 1 moves the disposable diaper 50 from the cutting position P2 to the delivery position P3 about a rotation axis C2 (see FIG. 1 ) orthogonal to the rotation axis C1. Figure 2 ) is the center of rotation.

[0028] Specifically, the cutting device 1 includes: a rotating body 2 that can rotate in a rotation direction D1; a plurality of holding parts 3 that are mounted on the rotating body 2; a plurality of anvils 4 that are respectively arranged between two adjacent holding parts 3; a cutter 5 that cuts the continuous body 50A between the anvils 4; and a plurality of limiting members 6 that limit the end of the disposable diaper 50 cut by the cutter 5 from moving inwardly in the radial direction of a circle centered on the rotation axis C1 (hereinafter referred to as the radial direction) (refer to Figure 3 and a fixing member 7, which is fixed to a support member outside the figure provided at the setting location of the cutting device 1 (reference Figure 4 ).

[0029] Reference Figure 4, the rotating body 2 is configured to be rotatable along a rotation direction D1 centered on the rotation axis C1. Specifically, the rotating body 2 includes: a rotating drive shaft 2a, which is rotatably supported around the rotation axis C1 on a support component outside the figure provided at the setting location of the cutting device 1; a rotating plate 2b, which is fixed to the distal end of the rotating drive shaft 2a; a support cylinder 2c, which extends from the rotating plate 2b in a direction away from the rotating drive shaft 2a; and a plurality of suction boxes 2d, which are fixed to the outer peripheral surface of the support cylinder 2c. The rotating drive shaft 2a rotates in the rotation direction D1 in response to the drive motor M1 connected to the rotating drive shaft. The rotating plate 2b is a disc-shaped component extending in a direction orthogonal to the rotating drive shaft 2a. The support cylinder 2c extends from a position radially inward of the peripheral edge of the rotating plate 2b in a direction opposite to the rotating drive shaft 2a.

[0030] Reference Figure 1 and Figure 4 The plurality of suction boxes 2d are respectively accompanied by the plurality of holding parts 3 and are provided at the same position as the holding parts 3 in the circumferential direction (hereinafter referred to as the circumferential direction) centered on the rotation axis C1. Since the suction boxes 2d have the same structure, the structure of one suction box 2d will be described below.

[0031] The suction box 2d has: a hollow box body 2d1 having a negative pressure chamber 2d13; and a pair of bearings 2d2 that rotatably support the rotation drive shaft 3b described below on the box body 2d1. Through holes 2d11 are formed on a pair of wall portions of the box body 2d1 that intersect the radial direction, and a pair of bearings 2d2 are provided in these through holes. In addition, an opening 2d12 that opens the negative pressure chamber 2d13 is formed on the wall portion of the box body 2d1 on the opposite side facing the rotation drive shaft 2a.

[0032] The plurality of holders 3 each have a holding surface 3a1 for holding the disposable diaper 50 and the continuous body 50A thereof, and the holding surfaces 3a1 are arranged in the circumferential direction and attached to the rotating body 2. Since the plurality of holders 3 each have the same structure, the structure of one holder will be described below.

[0033] The holding portion 3 includes: a holding seat 3a for holding the disposable diaper 50 and its continuous body 50A; a rotary drive shaft 3b extending radially inward from the holding seat 3a; and a cam mechanism 3c provided at the radial inner end of the rotary drive shaft 3b.

[0034] The holder 3a is a hollow member having a negative pressure chamber 3a2 to which negative pressure is supplied from the suction box 2d. The holder 3a has a holding surface 3a1 facing outward in the radial direction and used to hold the disposable diaper 50, and a plurality of suction holes 3a3 formed on the holding surface 3a1 (see Figure 2 ).like Figure 2As shown, the holding surface 3a1 has a shape that can accommodate the disposable diaper 50 except for the lower end of the side seals 50c and the crotch portion 50b. Specifically, the holding surface 3a1 has the following shape: at the rotation axis viewpoint ( Figure 2 The plurality of suction holes 3a3 are arranged in an area corresponding to the shape of the disposable diaper 50 placed on the holding surface 3a1. Specifically, the area where the plurality of suction holes 3a3 are arranged includes: an area extending along the waist portion 50a; and an area extending along the crotch portion 50b.

[0035] like Figure 4 As shown, the rotary drive shaft 3b is mounted on the rotating body 2, and in this embodiment, it is mounted on the suction box 2d, and the rotary drive shaft 3b can rotate around the rotation axis C1 and can rotate around the rotation axis C2. Specifically, the rotary drive shaft 3b extends from the retaining seat 3a through the through hole 2d11 of the suction box 2d and the through hole 2c1 of the support tube 2c to the inner position of the radial direction of the support tube 2c. The middle part of the rotary drive shaft 3b can be arranged in the suction box 2d through the bearing 2d2 arranged in the suction box 2d in a state where it can rotate around the rotation axis C2 and cannot rotate around the rotation axis C1. In addition, the rotary drive shaft 3b has a connecting passage 3b1 that connects the negative pressure chamber 3a2 of the retaining seat 3a with the negative pressure chamber 2d13 of the suction box 2d. The negative pressure chamber 3a2 is supplied with negative pressure through the connecting passage 3b1, so that the suction hole 3a3 (holding surface 3a1) is given suction. In order to ensure the suction force, the bearing 2d2 is used to ensure airtightness between the rotation drive shaft 3b and the box body 2d1.

[0036] The cam mechanism 3c is provided radially inward of the support cylinder 2c and specifically includes an arm 3c1 extending from the rotary drive shaft 3b in a direction orthogonal to the rotary axis C2 and a cam follower 3c2 extending radially inward from the distal end of the arm 3c1.

[0037] Below, refer to Figure 1 and Figure 4 The structure of the fixing member 7 will be described. The fixing member 7, together with the rotating body 2 and the holding portion 3, applies an adsorption force to the holding surface 3a1 of the holding seat 3a, and rotates the holding seat 3a around the rotation axis C2.

[0038] The fixing member 7 includes: a vertical plate 7a, which is vertically arranged opposite to the rotating plate 2b via the suction box 2d; and a protrusion 7b, which protrudes from the vertical plate 7a in a manner inserted into the support tube 2c. Figure 1In the figure, for convenience of explanation, only the upright plate 7a in the fixing member 7 is indicated by an imaginary line, and the structure of the inner region in the radial direction of the support tube 2c is omitted from illustration.

[0039] Reference Figure 1 and Figure 4 , the upright plate 7a has a connecting groove 7a1, which is open to the suction box 2d and extends within a specified angle range centered on the rotation axis C1. Specifically, the connecting groove 7a1 extends from the upstream position of the cut-off position P2 in the rotation direction D1 of the rotating body 2 (in the present embodiment, it is the rotation position where suction is generated at the receiving position P1) to the downstream position of the cut-off position P2 (in the present embodiment, it is the rotation position where suction is generated at the delivery position P3). In addition, from the viewpoint of the rotation axis, the connecting groove 7a1 is arranged at a position in the radial direction that overlaps with the opening 2d12 of the above-mentioned suction box 2d. Therefore, from the viewpoint of the rotation axis, when the rotating body 2 is rotated to the position where the opening 2d12 overlaps with the connecting groove 7a1, as shown Figure 4 As shown, the negative pressure generated by the suction source V connected to the connecting groove 7a1 is supplied to the negative pressure chamber 3a2 of the holding seat 3a through the connecting groove 7a1, the opening 2d12, the negative pressure chamber 2d13, and the connecting passage 3b1, and the suction hole 3a3 (holding surface 3a1) is given suction. In this embodiment, within the rotation range from the receiving position P1 to the delivery position P3, the holding surface 3a1 of the holding portion 3 is given an adsorption force.

[0040] The protruding portion 7b has a cam groove 7b1, which is open to the outside in the radial direction and extends in the circumferential direction, and engages with the cam follower 3c2 of the cam mechanism 3c. The cam groove 7b1 is formed on the protruding portion 7b over the entire circumference of the rotation axis C1. Specifically, the cam groove 7b1 has a shape that substantially rotates the retaining seat 3a about the rotation axis C2 by 90 degrees in response to the rotation of the retaining portion 3 from the cutting position P2 to the delivery position P3 (such as Figure 4 The cam groove 7b1 has a shape (not shown) that is curved in the axial direction of the rotation axis C1. The cam groove 7b1 has a shape (not shown) that rotates the holder 3a substantially by -90° about the rotation axis C2 in response to the rotation of the holder 3 from the delivery position P3 to the receiving position P1.

[0041] In this embodiment, the suction box 2d, the cam mechanism 3c, and the protrusion 7b constitute a rotation mechanism, which connects the holding portion 3 to the rotating body 2, so that the holding portion 3 can rotate relative to the rotating body 2 around the rotation axis C2 in accordance with the progress of the rotation of the rotating body 2 from the cutting position P2 to the rotation direction. Figure 2As shown, the rotating mechanism connects the holding portion 3 to the rotating body 2 so as to be rotatable between a first rotating position PV1 for conveying the continuous body 50A along its longitudinal direction and a second rotating position PV2 for rotating the cut disposable diaper 50 by 90°.

[0042] Reference Figure 1 and Figure 3 , a plurality of anvils 4 are respectively arranged between two circumferentially adjacent retaining portions 3 among a plurality of retaining portions 3; since each anvil 4 has the same structure, the structure of one anvil 4 is described below. The anvil 4 includes: a base 4a, which is fixed to the support tube 2c of the rotating body 2; and an anvil body 4b, which is fixed to the base 4a and extends radially outward from the base 4a. The anvil body 4b is a plate-shaped component extending in the radial direction. In addition, the anvil body 4b has an outer side 4b1, which faces the outer side in the radial direction and cuts the continuous body 50A between the cutters 5.

[0043] The cutter 5 is arranged at the cutting position P2 so as to be able to face the outer surface 4b1 of each anvil 4 in sequence in accordance with the rotation of the rotating body 2, and cut the continuous body 50A between the cutter and the outer surface 4b1. Specifically, the cutter 5 has a cutter drum 5a that can rotate around an axis parallel to the rotation axis C1, and a cutting blade 5b provided on the outer peripheral surface of the cutter drum 5a. The cutter drum 5a is driven to rotate by a driving source outside the figure, so that when the outer surface 4b1 of the anvil 4 reaches the cutting position P2 as the rotating body 2 rotates, the cutting blade 5b faces the outer surface 4b1. That is, the cutter 5 is driven synchronously with the rotating body 2.

[0044] The plurality of limiting components 6 limit the end of the disposable diaper 50 cut by the cutter 5 to extend radially inward from the holding surface 3a1 of the holding portion 3 and contact the side surface 3a4 (the side surface of the holding seat 3a in this embodiment) facing the circumferential direction. In this embodiment, the plurality of limiting components 6 are respectively arranged between two holding portions 3 and each anvil 4 located on both sides of each anvil 4 for all the anvils 4. Since all the limiting components 6 have substantially the same structure, the structures of the two limiting components 6 separated by each anvil 4 are substantially symmetrical with respect to the anvil 4 from the viewpoint of the rotation axis, and therefore, the structure of one limiting component 6 is described below.

[0045] The limiting member 6 is fixed to the rotating body 2 via the anvil 4. Specifically, the limiting member 6 includes: a fixing portion 6a extending outward in the radial direction and fixed to the circumferential side of the seat 4a of the anvil 4 by a bolt B1; a limiting portion 6b extending from the radially outer end of the fixing portion 6a in the circumferential direction opposite to the anvil 4; and a connecting portion 6c connecting the fixing portion 6a and the limiting portion 6b. The fixing portion 6a and the limiting portion 6b are formed by bending a sheet of metal plate, and the connecting portion 6c constrains the fixing portion 6a and the limiting portion 6b to limit the angle change between the fixing portion 6a and the limiting portion 6b.

[0046] The limiting portion 6b is arranged along an imaginary straight line L1 (see FIG. 1 ) connecting the end edge of the anvil 4 facing the outer surface 4b1 close to the holding portion 3 in the circumferential direction and the end edge of the holding surface 3a1 of the holding portion 3 close to the anvil 4 from the viewpoint of the rotation axis. Figure 4 ) extends. In addition, the limiting portion 6b has a limiting surface 6b1 extending along the imaginary straight line L1 and facing the outside in the radial direction. In the present embodiment, the entire limiting surface 6b1 is located on the outside in the radial direction relative to the imaginary straight line L1. In addition, from the viewpoint of the rotation axis, the limiting surface 6b1 can be located on the imaginary straight line L1, or it can intersect with the imaginary straight line L1. Moreover, the entire limiting surface 6b1 can also be located on the inside in the radial direction relative to the imaginary straight line L1. At this time, in order to limit the end of the disposable diaper 50 cut by the tool 5 from contacting the side surface 3a4 of the retaining portion 3, the portion located on the outside in the radial direction relative to the inner end 3a41 in the radial direction of the side surface 3a4 of the retaining portion 3 must exist as the limiting surface 6b1.

[0047] In addition, if Figure 2 As shown, the limiting member 6 has an edge 6d, and the edge 6d forms an arc shape with the rotation axis C2 as the center along the rotation trajectory of the portion of the holding portion closest to the limiting member 6 during the rotation between the first rotation position PV1 and the second rotation position PV2 (in this embodiment, the arc portion with the rotation axis C2 as the center). The edge 6d is provided at the portion of the limiting member 6 having the limiting surface 6b1, so that the limiting surface 6b1 can be arranged close to the holding portion 3.

[0048] As described above, according to the above embodiment, since the limiting member 6 is provided, it is possible to limit the end of the disposable diaper 50 cut by the cutter 5 from colliding with the side surface 3a4 of the holding portion 3 of the anvil 4. Thus, the cut disposable diaper 50 can be prevented from being folded or falling off due to the impact of the collision.

[0049] According to the above embodiment, since the limiting surface 6b1 is located radially outside relative to the radial inner end of the side surface 3a4 of the retaining portion 3, it is possible to prevent the end of the disposable diaper 50 cut by the tool 5 from colliding with the radial inner end 3a41 of the side surface 3a4 of the retaining portion 3.

[0050] According to the above embodiment, the limiting surface 6b1 is located radially outward relative to the imaginary straight line L1 from the viewpoint of the rotation axis. Therefore, when the end of the disposable diaper 50 cut by the cutter 5 moves toward the holding portion 3, the end is guided to the radially outward position of the side surface 3a4 (imaginary straight line L1) of the holding portion 3, thereby more effectively suppressing the collision between the end of the disposable diaper 50 and the side surface 3a4 of the holding portion 3.

[0051] According to the above embodiment, since the rotating mechanism (suction box 2d, cam mechanism 3c, and protrusion 7b) is provided, the posture of the disposable diaper 50 after being cut by the cutter 5 can be changed. Here, it is conceivable to fix the limiting member 6 to the holding portion 3. In such a case, since the weight of the holding portion 3 increases, the inertia force of the holding portion 3 during the rotation becomes larger, and it is difficult to drive one holding portion at a high speed.

[0052] On the other hand, according to the above embodiment, since the limiting component 6 is fixed to the rotating body 2, the weight of the limiting component 6 can be borne by the rotating body 2 instead of the retaining part 3, so the limiting component 6 can be set without causing the rotation drive of one side of the retaining part 3 to slow down.

[0053] According to the above embodiment, the limiting member 6 has an edge portion formed in an arc shape with the rotation axis C2 as the center from the rotation axis viewpoint, so that the holding portion 3 can be allowed to rotate between the first rotation position PV1 and the second rotation position PV2, and when the anvil 4 rotates to the cutting position P2 (i.e., when cutting), the limiting member 6 is arranged close to the holding portion 3. Therefore, the end of the disposable diaper 50 cut by the cutter 5 can be more effectively limited from colliding with the side of the holding portion 3.

[0054] According to the above embodiment, since the restricting members 6 are provided on both sides of the anvil 4 in the circumferential direction at the cutting position P2 , it is possible to suppress the folding of both ends of the disposable diaper 50 formed by the cutter 5 .

[0055] Below, refer to Figure 5 to Figure 7 The structure of the cutting device 11 according to the second embodiment of the present invention will be described. Figure 5 to Figure 7 In the present invention, the same components as those of the cutting device 1 according to the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

[0056] The cutting device 11 has a holding surface 13a1 having a shape different from the holding surface 3a1 of the first embodiment. Specifically, the holding surface 13a1 has a rotation axis viewpoint ( Figure 5 A circle with the rotation axis C2 as the center from the viewpoint of the rotation axis.

[0057] Furthermore, the cutting device 11 includes a regulating member 16 which is different from the cutting device 1 of the first embodiment.

[0058] The limiting member 16 is fixed to the rotating body 2 via the anvil 4. Specifically, Figure 6 As shown, the limiting component 16 has a limiting surface 16a, which faces outward in the radial direction and is located outward in the radial direction relative to the inner end in the radial direction of the side surface 3a4 of the retaining portion 3. Specifically, from the perspective of the rotation axis, the limiting surface 16a is located outward in the radial direction relative to an imaginary straight line L1 connecting the end edge of the retaining portion 3 circumferentially facing the outside 4b1 and the end edge of the retaining surface 3a1 of the retaining portion 3 close to the anvil 4. Similar to the first embodiment, the position of the limiting surface 16a is adjustable. In addition, the shape of the limiting surface 16a from the perspective of the rotation axis (the shape of the portion located on one side in the circumferential direction relative to the anvil 4) is different from the limiting surface 6b1 of the first embodiment, and is a rectangle extending in a direction parallel to the rotation axis C1.

[0059] Reference Figure 7 The limiting component 16 is a hollow component having a negative pressure chamber 16b inside. In addition, the limiting component 16 has: a suction hole 16c that opens the negative pressure chamber 16b to the outside in the radial direction on the limiting surface 16a, and an opening 16d that opens the negative pressure chamber 16b to the upright plate 17a. Here, the upright plate 17a of the second embodiment has a connecting groove 17a1 that is open to the limiting component 16 and extends within a specified rotation range centered on the rotation axis C1. Specifically, as Figure 1 As shown, within the rotation range of the rotating body 2 from the rotation position upstream of the cut-off position P2 to the rotation position downstream of the cut-off position, the connecting groove 17a1 is provided in a range provided for generating an adsorption force on the restricting surface 16a (for reference, Figure 1 In the figure, the rotation range R1 is indicated. In addition, the connecting groove 17a1 is formed at a position in the radial direction that can overlap with the opening 16d from the viewpoint of the rotation axis. Therefore, from the viewpoint of the rotation axis, when the rotating body 2 rotates within the range where the opening 16d and the connecting groove 17a1 overlap, Figure 7 As shown, negative pressure generated by the suction source V connected to the communication groove 17a1 is supplied to the negative pressure chamber 16b of the restriction member 16 through the communication groove 17a1 and the opening 16d, and suction force is applied to the suction hole 16c (restriction surface 16a).

[0060] In the second embodiment, the upright plate 17a and the restricting member 16 constitute an adsorption mechanism, and the rotation range R1 of the rotating body 2 from the rotation position located upstream of the cutting position P2 to the rotation position located downstream of the cutting position P2 (see Figure 1 ) supplies an adsorption force for adsorbing the disposable diaper 50 to the restriction surface 16a. In the second embodiment, the rotation position downstream of the cutting position P2 is set to the rotation position of the rotating body 2 before the rotation mechanism starts the rotation of the holding portion 3.

[0061] According to the second embodiment, since the limiting member 16 is fixed to the anvil 4, the limiting surface 16a can be arranged close to the anvil 4, that is, the cutting position P2. In addition, the disposable diaper 50 can be adsorbed on the limiting surface 16a during the entire period from before to after being cut by the cutter 5, so that the disposable diaper 50 can be suppressed from moving from the regular position of the anvil 4 at the cutting position P2, thereby enabling the disposable diaper 50 to be cut at a more accurate position.

[0062] According to the second embodiment, the supply of the suction force to the regulating surface 16a can be stopped before the rotation of the holding unit 3 starts, and therefore, the holding unit 3 (disposable diaper 50) can be reliably rotated thereafter.

[0063] In addition, the present invention is not limited to the above-mentioned embodiment, and for example, the following aspects may be adopted.

[0064] In the first and second embodiments, the examples in which the restriction members are provided on both sides of each anvil 4 in the circumferential direction have been described. However, the restriction member may be provided on only one side of the anvil 4 in the circumferential direction.

[0065] In the first and second embodiments, the restriction members are provided for all the anvils 4 , but the restriction member may be provided for at least one anvil 4 .

[0066] As an example of the sheet body, the disposable diaper 50 has been described, but the present invention is not limited thereto. The cutting devices 1 and 11 can be used for conveying and cutting a sheet body extending in the longitudinal direction.

[0067] The cutting device of the first and second embodiments includes a rotating mechanism for rotating the holding base 3a, but the rotating mechanism may be omitted.

[0068] In the cutting device of the first and second embodiments, the disposable diaper is held on the holding seat 3a by suction, but the holding force is not limited to suction. For example, the disposable diaper can be mechanically held on the holding seat 3a.

[0069] In addition, the above-mentioned specific embodiments mainly include inventions having the following structures.

[0070] In order to solve the above technical problems, the first invention provides a cutting device, which transports a sheet extending along a long side direction along the long side direction and cuts the sheet along a direction orthogonal to the long side direction, the cutting device comprising: a rotating body, which can rotate along a specified rotation direction centered on a rotation axis; a plurality of holding parts, each having a holding surface, the holding surface facing outward in the radial direction of a circle centered on the rotation axis, and used to hold the sheet, the holding surface being installed on the rotating body in an arranged manner along a circumferential direction centered on the rotation axis; a plurality of anvils, respectively arranged between two holding parts adjacent to each other in the circumferential direction among the plurality of holding parts; a cutter, which is used as the The cutting position which is pre-set according to the position of the rotating body in the rotation direction is arranged to be able to correspond to the rotation of the rotating body in sequence to the outer side of each anvil facing the outer side in the radial direction, and cut the sheet body between the tool and the outer side; and a limiting component is arranged between a specific anvil among the multiple anvils and a one-side holding part, and the one-side holding part is one of the two holding parts located on both sides of the specific anvil, and when the specific anvil is rotated to the cutting position, the end of the sheet body cut by the tool is limited to extend from the holding surface of the one-side holding part to the inner side in the radial direction and contact the side facing the circumferential direction.

[0071] According to the present invention, since a limiting member is provided, it is possible to limit the end of the sheet body cut by the cutter from colliding with a specific anvil and the side of one holding portion. Thus, the sheet body after the cut can be suppressed from folding or falling off due to the impact of the above-mentioned collision.

[0072] According to a second invention, in the first invention, the restriction member preferably has a restriction surface that faces outward in the radial direction and is located outward in the radial direction relative to an inner end in the radial direction of a side surface of the one holding portion.

[0073] According to the second invention, it is possible to suppress the end portion of the sheet body cut by the cutter from colliding with the inner end in the radial direction of the side surface of the one holding portion.

[0074] The third invention is more ideal when, in the second invention, the limiting surface, from the viewpoint of the rotation axis observed along the rotation axis, is located radially outside relative to an imaginary straight line connecting the end edge of the one retaining portion facing outward in the circumferential direction and the end edge of the retaining surface of the one retaining portion close to the specific anvil.

[0075] According to the third invention, when the end of the sheet cut by the tool moves toward one of the retaining parts, the end is guided to the outer position in the radial direction of the side surface (imaginary straight line) of one of the retaining parts, thereby more effectively suppressing the conflict between the end of the sheet and the side surface of one of the retaining parts.

[0076] The fourth invention is more ideal. In the first to third inventions, the rotating mechanism connects the one-side retaining portion to the rotating body so that the one-side retaining portion can rotate relative to the rotating body around a rotating axis orthogonal to the rotating axis in response to the progress of the rotation of the rotating body from the cutting position to the rotation direction, wherein the limiting component is fixed to the rotating body.

[0077] According to the fourth invention, since there is a rotating mechanism, the posture of the sheet after being cut by the cutter can be changed. Here, it can be considered to fix the limiting member to one of the holding parts. In such a case, since the weight of the one of the holding parts will increase, the inertia force of the one of the holding parts during the rotation will increase, making it difficult to drive the one of the holding parts to rotate at a high speed.

[0078] On the other hand, according to the fourth invention, since the limiting member is fixed to the rotating body, the weight of the limiting member can be borne by the rotating body rather than the holding portion, so the limiting member can be provided without slowing down the rotational drive of one holding portion.

[0079] The fifth invention is more ideal. In the fourth invention, the limiting component is fixed to the anvil and has a limiting surface, and the limiting surface is facing outward in the radial direction from the rotation axis viewpoint observed along the rotation axis, and the cutting device also includes: an adsorption mechanism, which supplies an adsorption force for adsorbing the sheet to the limiting surface within the rotation range of the rotating body from a rotation position located upstream of the cutting position to a rotation position located downstream of the cutting position.

[0080] According to the fifth invention, since the limiting member is fixed to the anvil, the limiting surface can be arranged close to the anvil, i.e., the cutting position. Moreover, during the entire period from before the cutter is cut to after the cut, the sheet body can be adsorbed on the limiting surface, thereby suppressing the sheet body from moving from the regular position of the anvil at the cutting position, thereby cutting the sheet body at a more correct position.

[0081] According to a sixth aspect of the present invention, in the fifth aspect of the present invention, the rotation position downstream of the cutting position is set to be a rotation position of the rotating body before the rotating mechanism starts rotating the one holding portion.

[0082] According to the sixth aspect of the present invention, the supply of the suction force to the regulating surface can be stopped before the one holding portion starts to rotate, so that the one holding portion (sheet body) can be reliably rotated thereafter.

[0083] The seventh invention is more ideal when, in any one of the fourth to sixth inventions, the rotating mechanism connects the one-side holding portion to the rotating body in a manner that allows the portion to rotate between a first rotating position and a second rotating position, and the limiting component has an edge portion, and when viewed from the rotating axis viewpoint along the rotating axis, the edge portion forms an arc shape centered on the rotating axis along a rotating trajectory of a portion of the one-side holding portion that is closest to the limiting component during the rotation between the first rotating position and the second rotating position.

[0084] According to the seventh invention, from the viewpoint of the rotation axis, the limiting component has an edge portion formed in an arc shape with the rotation axis as the center, so that the one-side holding portion can be allowed to rotate between the first rotation position and the second rotation position, and when the specific anvil rotates to the cutting position (i.e., when cutting), the limiting component is arranged close to the one-side holding portion. Therefore, it is possible to more effectively limit the end of the sheet body cut by the tool from colliding with the side of the one-side holding portion.

[0085] The eighth invention is more preferably that in any one of the first to seventh inventions, it further includes: another limiting component, which is arranged between the specific anvil and the other holding portion, and the other holding portion is the other of the two holding portions located on both sides of the specific anvil, and when the specific anvil is rotated to the cutting position, the end of the sheet cut by the tool is limited to extend from the holding surface of the other holding portion to the inside in the radial direction and contact the side facing the circumferential direction.

[0086] According to the eighth aspect of the present invention, since the restriction member and another restriction member are provided on both sides of the specific anvil in the cutting position in the circumferential direction, it is possible to suppress the folding of both end portions of the sheet body formed by the cutter.

Claims

1. A cutting device, characterized in that: The sheet extending along the long side direction is conveyed along the long side direction, and the sheet is cut along a direction orthogonal to the long side direction, wherein the cutting device comprises: A rotating body capable of rotating in a predetermined direction about a rotation axis; A plurality of holding portions, each having a holding surface, the holding surface facing outward in the radial direction of a circle centered on the rotation axis and used to hold the sheet body, the holding surfaces being arranged along a circumferential direction centered on the rotation axis and being mounted on the rotating body; a plurality of anvils, each of which is disposed between two adjacent holding portions in the circumferential direction among the plurality of holding portions; a cutter, at a cutting position which is preset as a position in the rotation direction of the rotating body, being arranged so as to be able to sequentially face the outer surfaces of the anvils which face outward in the radial direction in accordance with the rotation of the rotating body, and to cut the sheet body between the cutter and the outer surfaces; and A limiting component is arranged between a specific anvil among the multiple anvils and a one-side holding portion, wherein the one-side holding portion is one of the two holding portions located on both sides of the specific anvil, and when the specific anvil is rotated to the cutting position, the end of the sheet cut by the tool is limited to extend from the holding surface of the one-side holding portion to the inner side in the radial direction and contact the side facing the circumferential direction.

2. The cutting device according to claim 1, characterized in that: The restriction member has a restriction surface that faces outward in the radial direction and is located outward in the radial direction relative to an inner end in the radial direction of a side surface of the one holding portion.

3. The cutting device according to claim 2, characterized in that: The limiting surface is located radially outside of an imaginary straight line connecting the end edge of the one retaining portion facing outward in the circumferential direction and the end edge of the retaining surface of the one retaining portion close to the specific anvil, from a viewpoint of the rotation axis observed along the rotation axis.

4. The cutting device according to claim 1, characterized in that Also includes: A rotation mechanism connects the one holding portion to the rotating body so that the one holding portion can rotate relative to the rotating body around a rotation axis orthogonal to the rotation axis in response to the progress of the rotation of the rotating body from the cutting position to the rotation direction, wherein The restriction member is fixed to the rotating body.

5. The cutting device according to claim 4, characterized in that: The limiting member is fixed to the anvil and has a limiting surface, the limiting surface facing outward in the radial direction from a rotation axis viewpoint observed along the rotation axis. The cutting device further includes a suction mechanism that supplies a suction force for sucking the sheet to the restriction surface within a rotation range of the rotating body from a rotation position located upstream of the cutting position to a rotation position located downstream of the cutting position.

6. The cutting device according to claim 5, characterized in that: The rotation position downstream of the cutting position is set to be the rotation position of the rotating body before the rotation mechanism starts rotating the one holding portion.

7. The cutting device according to claim 4, characterized in that: The rotating mechanism connects the one holding portion to the rotating body so as to be rotatable between a first rotating position and a second rotating position. The limiting component has an edge, and the edge forms an arc centered on the rotation axis along the rotation trajectory of the part of the one retaining part closest to the limiting component during the rotation between the first rotation position and the second rotation position, from the rotation axis viewpoint observed along the rotation axis.

8. The cutting device according to claim 1, characterized in that Also includes: Another limiting component is arranged between the specific anvil and the other holding part, and the other holding part is the other of the two holding parts located on both sides of the specific anvil. When the specific anvil is rotated to the cutting position, the end of the sheet cut by the tool is limited to extend from the holding surface of the other holding part to the inside in the radial direction and contact the side facing the circumferential direction.

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