Cutting device and tissue product manufacturing facility

Abstract

To provide a cutting device, etc. capable of reducing the load and time accompanying alteration of the constitution of the device when tissue products are increased in variation, without exerting any large influence of the lives of constituent components.SOLUTION: A cutting device 20 comprises: two or more disk-like cutting blades M; a revolving mechanism which revolves the two or more disk-like cutting blades M on an axis of revolution; a reciprocating mechanism which can move the disk-like cutting blades forward and backward once along the axes of the disk-like cutting blades as the revolving mechanism makes one revolution; and a varying mechanism for the operation distance of the reciprocating mechanism. The operation-directional length of a tissue product is varied by varying the operation distance of the reciprocating mechanism. Even when a tissue product TS differing in variation is manufactured, the device can be adjusted without a large load or a long time. Further, there is no need to make an adjustment for placing a large load on a constituent element such as varying a revolving speed.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a cutting device and a tissue product manufacturing facility. More specifically, the present invention relates to a cutting device having two or more disk-shaped cutting blades, and a tissue product manufacturing facility using this cutting device.

Background Art

[0002] A tissue product TS formed by folding tissue paper into multiple layers is manufactured by cutting a long sheet laminate LS into a predetermined length. Here, the tissue paper includes not only dry thin paper made from wood pulp but also so-called wet tissues mainly made of non-woven fabric and impregnated with various chemical solutions.

[0003] Patent Document 1 discloses the configuration of a device for cutting a sheet laminate LS into a predetermined length. The configuration of this device and the method of cutting the sheet laminate LS will be described with reference to FIGS. 9 to 11. FIG. 9(A) is a schematic explanatory diagram showing the relationship between a disk-shaped cutting blade M, its revolution locus D during revolution, and the sheet laminate LS to be cut, and FIG. 9(B) is a schematic explanatory diagram showing the position of the disk-shaped cutting blade M immediately before cutting the sheet laminate LS and the position of the disk-shaped cutting blade M immediately after cutting.

[0004] As shown in Fig. 9(A), in Patent Document 1, a long sheet laminate LS is cut using a disc-shaped cutting blade M. In this figure, the long sheet laminate LS is arranged parallel to the horizontal reference plane B and is conveyed in the longitudinal direction from the back side to the front side in the plane of Fig. 9. The conveyed sheet laminate LS is cut by the disc-shaped cutting blade M. The disc-shaped cutting blade M rotates about the rotation axis C1. In addition, the two disc-shaped cutting blades M are provided on a revolving member, and this member rotates at a revolving speed V1 in the direction of the arrow shown in the figure about the revolving axis C2. That is, this apparatus has a revolving mechanism that revolves around the revolving axis C2. With such a configuration, the sheet laminate LS can be continuously cut. Note that the circle indicated by the reference symbol D in the figure is the revolving locus of the rotation axis C1. In particular, Fig. 9(B) shows the positions of the disc-shaped cutting blade M immediately before and immediately after cutting the sheet laminate LS. As shown in this figure, the rotation axis C1 of the disc-shaped cutting blade M moves by a moving angle θ2 immediately before and immediately after cutting.

[0005] Fig. 10 is a diagram showing the positional relationship between the sheet laminate LS and the disc-shaped cutting blade M when the sheet laminate LS is cut by the disc-shaped cutting blade M while operating in its longitudinal direction. More specifically, Fig. 10 shows, in chronological order from above, the position of the sheet laminate LS in the conveyance direction and the positional relationship between the sheet laminate LS and the disc-shaped cutting blade M when a predetermined time has elapsed. That is, the top figure shows the situation immediately before the disc-shaped cutting blade M starts cutting the sheet laminate LS, the middle figure shows the situation when the rotation center C1 of the disc-shaped cutting blade M is located at the vertical center of the sheet laminate LS, and the bottom figure shows the situation immediately after the disc-shaped cutting blade M finishes cutting the sheet laminate LS. The conveyance direction of the sheet laminate LS is from right to left in Fig. 10. As shown in this figure, when the sheet laminate LS is cut while being conveyed, for the cutting surface to be exactly perpendicular to the conveyance direction, the disc-shaped cutting blade M needs to move in the conveyance direction of the sheet laminate LS at a predetermined speed that is the same as the conveyance speed of the sheet laminate LS.

[0006] FIG. 11 is a schematic explanatory view showing the relationship between the conveying direction of the sheet laminate LS and the rotation axis of the revolving motion of the disk-shaped cutting blade M in the apparatus disclosed in Patent Document 1. FIG. 11 is a view of the configuration of FIG. 9 as seen from the right to the left in FIG. 9. In Patent Document 1, the rotation axis C2 of the revolving member is inclined by a predetermined inclination angle θ3 with respect to the conveying direction of the sheet laminate LS. By having a mechanism for inclining the rotation axis C2 of the revolving member by the inclination angle θ3 in this way, the disk-shaped cutting blade M will perform a reciprocating motion in its axial direction. Therefore, the mechanism for providing this inclination angle θ3 can be called a reciprocating mechanism. Also, in this case, the rotation axis C1 is substantially parallel to the conveying direction of the sheet laminate LS. By doing so, as shown in FIG. 11, the cutting surface of the tissue product TS cut from the sheet laminate LS can be made exactly perpendicular to its conveying direction. Note that the rotation axis C1 and the rotation axis C2 need to be arranged so as to form the inclination angle θ3.

[0007] In the apparatus as described above, the inclination angle θ3 of the rotation axis C2 is determined as in Equation 1 by a plurality of parameters, specifically, the conveying speed V2 of the sheet laminate, the length l of the tissue product, the height h of the tissue product, the revolving speed V1 of the disk-shaped cutting blade 51, and the like.

[0008] [Equation 1] θ3 = f(V1, V2, l, h)

Prior Art Documents

Patent Documents

[0009]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0010] However, when considering increasing the variations of the manufactured tissue product TS, that is, when considering changing the length l and the height h of the tissue product TS, it is necessary to change the inclination angle θ3 of the revolving shaft. To change this inclination angle θ3 of the revolving shaft, it is necessary to change the configuration including all the revolving members and reassemble them, etc., and there is a problem that such a change requires a large load and time.

[0011] In addition, in order to increase the variations, it is also conceivable to change the conveyance speed V2 of the sheet laminate LS. However, in order to change the conveyance speed V2, it is necessary to change the specifications of the entire manufacturing facility upstream of the cutting device, and it is difficult to respond. Regarding the revolving speed V1 of the disk-shaped cutting blade M as another parameter, the speed during cutting can be set to a desired speed, and the speed when not cutting can be increased or decreased. However, in this case, acceleration and deceleration are repeated during one revolution, which places a great load on the revolving mechanism and shortens the life of the components constituting the mechanism.

[0012] In view of the above circumstances, an object of the present invention is to provide a cutting device and a tissue product manufacturing facility capable of reducing the load and time associated with the change in the configuration of the device when increasing the variations of the tissue product without significantly affecting the life of the components constituting the device.

Means for Solving the Problems

[0013] The cutting device of the first invention is a cutting device for cutting a tissue product of a predetermined length from a sheet laminate. The cutting device cuts the tissue product by synchronizing with the operation of the sheet laminate. The cutting device includes two or more disc-shaped cutting blades, a revolving mechanism that includes the two or more disc-shaped cutting blades and revolves the two or more disc-shaped cutting blades around a revolving axis, a reciprocating mechanism that reciprocates the disc-shaped cutting blade once in the axial direction of the disc-shaped cutting blade in accordance with one revolution of the revolving mechanism, and a mechanism for changing the operating distance of the reciprocating mechanism. The length of the tissue product in the operating direction is changed by changing the operating distance of the reciprocating mechanism by the changing mechanism. The cutting device of the second invention is the cutting device according to the first invention, wherein the reciprocating mechanism can reciprocate the disc-shaped cutting blade in the axial direction of the disc-shaped cutting blade by inclining a revolving plane including the revolving orbit of the disc-shaped cutting blade by the revolving mechanism by a predetermined angle with respect to the axial direction of the disc-shaped cutting blade. Further, the reciprocating mechanism includes a link mechanism including the two or more disc-shaped cutting blades, a revolving reference member for determining the inclination angle of the revolving plane, and a coupling member for coupling the link mechanism and the revolving reference member. The revolving plane inclines according to the inclination of the revolving reference member, and the changing mechanism changes the inclination angle of the revolving reference member. The tissue product manufacturing facility of the third invention includes a folding section for manufacturing a sheet laminate from a raw material roll, a conveyor for conveying the sheet laminate, and the cutting device according to claim 1 for cutting a tissue product of a predetermined length from the sheet laminate.

Advantages of the Invention

[0014] According to the first invention, since there are two or more disc-shaped cutting blades, a revolving mechanism for revolving these cutting blades, the disc-shaped cutting blades can be reciprocated in the axial direction by a reciprocating mechanism, and the operating distance of the reciprocating mechanism can be changed by a changing mechanism, even when manufacturing tissue products with different variations, the device can be adjusted without large loads and time. Also, since this adjustment is easy, even when manufacturing tissue products with different variations, there is no need to make adjustments that impose large loads on components that change the revolving speed. According to the second invention, since the reciprocating mechanism includes a revolving reference member and a link mechanism, and the changing mechanism can change the inclination angle of the revolving reference member, the adjustment can be performed with a relatively simple structure. According to the third invention, by having a folding section, a conveyor, and the cutting device of the first invention, it is possible to provide a device that can be adjusted without large loads and time even when manufacturing tissue products with different variations while ensuring production efficiency.

Brief Description of the Drawings

[0015]

Figure 1

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Figure 11

Embodiments for Carrying Out the Invention

[0016] Next, embodiments of the present invention will be described with reference to the drawings. However, the embodiments shown below illustrate a cutting device and a tissue product manufacturing facility for embodying the technical idea of the present invention, and the present invention is not limited to the following cutting device and tissue product manufacturing facility. Note that the sizes or positional relationships of the members shown in each drawing may be exaggerated for clarity of explanation. Furthermore, in the following description, the same names and reference numerals indicate the same or similar members, and detailed descriptions will be omitted as appropriate. In addition, in the following specification, the words "parallel" and "perpendicular" mean "substantially parallel" and "substantially perpendicular" to the extent that their configurations can exhibit their effects.

[0017] (Tissue Product Manufacturing Facility 10) FIG. 2(A) is a schematic explanatory diagram showing the main parts of the tissue product manufacturing facility 10 including the cutting device 20 of FIG. 1 according to the present embodiment, and FIG. 2(B) is a schematic explanatory diagram showing a sheet supply unit 13 which is a part of the tissue product manufacturing facility 10.

[0018] The main equipment part in Fig. 2(A) includes a folding part 11 and a cutting part 12. The sheet supply part 13 in Fig. 2(B) supplies the sheet S to the folding part 11.

[0019] In the folding part 11, the strip-shaped sheet S is supplied to the folding plate device 14, transferred from left to right in the drawing by the conveyor 50, and folded into a Z shape or a W shape (also called a zigzag shape) by the built-in folding plate. The strip-shaped sheet S is fed out from the two original roll reels R of the sheet supply part 13 shown in Fig. 2(B) to the folding plate device 14 and supplied through appropriate guides. Two original roll reels R are prepared. When the paper feed amount of one original roll reel R becomes small, the tip of the sheet S of the other original roll reel R is pulled out and joined to the end of the sheet S of the original roll reel R for paper splicing. For this paper splicing, a paper splicing device 15 is provided. When the remaining amount of the original roll reel R becomes small, the sheet S of the new original roll reel R is fed out to perform paper splicing, and this is repeated thereafter.

[0020] Dozens of units of the folding plate device 14 are arranged in series (only 4 units are shown in the figure). The sheet S is supplied to each of the individual folding plate devices 14 and folded into a Z shape or a W shape. Then, the sheet S folded by the upstream folding plate device 14 and the sheet S folded by the downstream folding plate device 14 are sequentially overlapped and meshed in a zigzag shape. This is the folding process, and usually, dozens to hundreds of sheets are folded to obtain a sheet laminate LS.

[0021] The folded long sheet laminate LS is cut into a predetermined length (about 10 cm to 30 cm) by a cutting device using two or more disc-shaped cutting blades M in the cutting part 12 to form a tissue product TS. Thereafter, the tissue product TS is stored in a packaging container or a packaging bag and supplied to the market.

[0022] (Cutting device 20 according to the first embodiment) Fig. 1 shows a schematic front view of the cutting device according to the first embodiment of the present invention, and Fig. 4 shows a plan view thereof. In Figs. 1 and 4, the case where the angle of the revolution plane including the revolution locus of the center of the disk-shaped cutting blade M with respect to the vertical direction (hereinafter, this angle is referred to as "revolution plane inclination angle θ1") is 10 degrees is shown. Fig. 3 shows a schematic front view in the case where the revolution plane inclination angle is 0 degrees, and Fig. 5 shows a schematic plan view thereof. In addition, Fig. 6 shows a schematic perspective view in the case where the revolution plane inclination angle is 10 degrees.

[0023] The cutting device 20 according to the present embodiment includes two disk-shaped cutting blades M. Note that the disk-shaped cutting blades M are not limited to two, and there is no problem as long as there are two or more. In the cutting device 20 according to the present embodiment, the two disk-shaped cutting blades M are arranged so as to be equally spaced and point-symmetrical about the revolution axis C2 which is the axis of the revolution main shaft 24. In the case of three or four or more, that is, three or four, they are also arranged so as to be equally spaced and point-symmetrical about the revolution axis C2.

[0024] The disk-shaped cutting blade M is supported at one end of the cutting blade support member 27 so as to be rotatable about the axis of the cutting blade support member 27. Further, the disk-shaped cutting blade M rotates by a rotation motor 28 provided at the other end of the cutting blade support member 27.

[0025] The cutting device 20 according to this embodiment includes a revolving mechanism that revolves a disc-shaped cutting blade M. The cutting device 20 according to this embodiment includes a first support member 22 and a second support member 23 on a base 21 for the cutting device, and a revolving main shaft 24 is rotatably provided so as to span the first support member 22 and the second support member 23. The revolving main shaft 24 is rotated by a driving belt 25 by a revolving motor 26. Further, the first link member 29 is coupled to the cutting blade support member 27 and the revolving main shaft 24 by a joint member 31. The joint member 31 is a member that can couple two or more members, and can be configured such that one member rotates in a predetermined direction with respect to the other member. The joint member 31 corresponds to, for example, a configuration including a thrust ball bearing. In this embodiment, the revolving mechanism corresponds to a configuration including a revolving motor 26 that causes a revolving operation, a revolving main shaft 24, and a first link member 29.

[0026] The cutting device 20 according to this embodiment includes a reciprocating mechanism that can reciprocate the disc-shaped cutting blade M in its axial direction in accordance with one revolution of the above-described revolving mechanism. In the cutting device 20 according to this embodiment, the first link member 29 and the second link member 30 are connected to the two cutting blade support members 27 so as to be rotatable by joint members 31 provided at their respective ends, and a link mechanism that forms a quadrilateral with these members is provided. Further, in this link mechanism, the first link member 29 and the second link member 30 are connected by a joint member 31 so as to be rotatable. This link mechanism includes a disc-shaped cutting blade M at each end of the cutting blade support member 27.

[0027] Further, the cutting device 20 according to the present embodiment includes a revolving reference member 33. As shown in FIGS. 4 and 5, the revolving reference member 33 is rotatably provided about a revolving reference member rotation shaft 38a by a revolving reference member support member 38. That is, it is configured to be able to rotate in the pitching direction with respect to the operating direction of the sheet laminate LS from the posture of the revolving reference member 33 shown in FIG. 3 to the posture shown in FIG. 1. And the cutting device 20 according to the present embodiment includes two or more coupling members 32 that couple the link mechanism and the revolving reference member 33. One end of the coupling member 32 is rotatably fixed to the second link member 30 by a joint member 31, and the other end is fixed to the outer ring of a bearing 34 for the link mechanism provided in the revolving reference member 33 by a spherical bearing 35.

[0028] The operations of the revolving mechanism and the reciprocating mechanism will be described with reference to FIGS. 3 and 1. FIG. 3 shows the case where the revolving surface inclination angle is 0 degrees. The revolution of the disk-shaped cutting blade M is performed by the rotation of the revolution motor 26 being transmitted to the revolution main shaft 24 by the drive belt 25. When the revolving surface inclination angle is 0 degrees, the orbital surface of the bearing 34 for the link mechanism of the revolving reference member 33 is perpendicular to the revolution main shaft 24, and the left-right position of the disk-shaped cutting blade M with respect to the cutting device base 21 in the plane of FIG. 3 does not change during one revolution of the revolving mechanism. In contrast, as shown in FIG. 1, when the revolving surface inclination angle θ1 has a predetermined angle (10 degrees in the present embodiment), for example, in the plane of FIG. 1, the upper coupling member 32 moves from the upper position to the lower position. As the orbital surface of the bearing 34 for the link mechanism of the revolving reference member 33 is inclined with respect to the vertical plane of the revolution main shaft 24, it moves from right to left in the plane of FIG. 1 with reference to the cutting device base 21 of the cutting device 20. At this time, since the coupling member 32 and the outer ring of the bearing 34 for the link mechanism are coupled by the spherical bearing 35, an operation of smoothly changing the angle is performed. Also, the lower coupling member 32 moves from the lower position to the upper position, and moves from left to right in the plane of FIG. 1 with reference to the cutting device base of the cutting device 20. This movement from right to left and from left to right is a reciprocating motion.

[0029] In the cutting device 20 according to the present embodiment, a mechanism for changing the operating distance of the reciprocating mechanism is provided. Specifically, the changing mechanism includes an operating distance changing member 36 formed of a screw and a handle 37 capable of rotating the operating distance changing member 36. Further, an end portion of the operating distance changing member 36 is rotatably coupled to a revolution reference member 33 by an articulating member 31. By rotating the handle 37, the operating distance changing member 36 is inserted and removed from the second support member 23, and by this operation, the changing mechanism changes the angle of the raceway surface of the bearing 34 for the link mechanism of the revolution reference member 33 from a plane perpendicular to the axis of the revolution spindle 24, thereby changing the operating distance of the reciprocating mechanism.

[0030] In the cutting device 20 according to the present embodiment, the handle 37 for rotation is used, but it is also possible to use a motor for this part. Further, instead of the articulating member 31 between the first link member 29 and the revolution spindle 24, a motor capable of changing the angle between the revolution spindle 24 and the first link member 29 is provided, and thereby it is also possible to change the operating distance of the reciprocating mechanism.

[0031] Since there are two or more disc-shaped cutting blades M, a revolving mechanism for revolving these disc-shaped cutting blades M, and the disc-shaped cutting blades M can be reciprocated in the axial direction by a reciprocating mechanism and the operating distance of the reciprocating mechanism can be changed by a changing mechanism, even when manufacturing tissue products TS of different variations, the device can be adjusted without large load and time. Further, since this adjustment is easy, even when manufacturing tissue products TS of different variations, there is no need to make an adjustment that places a large load on components that change the revolving speed.

[0032] The reciprocating mechanism includes a revolution reference member 33 and a link mechanism, and since the changing mechanism can change the inclination angle of the revolution reference member 33, the adjustment can be performed with a relatively simple structure.

[0033] By having the tissue product manufacturing facility 10 include a folding section 11, a conveyor 50, and a cutting device 20 with a predetermined configuration, it is possible to provide a device that can be adjusted without a large load and time even when manufacturing tissue products TS with different variations while ensuring production efficiency.

[0034] FIG. 7 shows a control block diagram of the cutting device 20 according to the present embodiment. The cutting device 20 according to the present embodiment includes a control unit 40 and an operation unit 41 that receives instructions from the operator of the cutting device 20 and notifies the operator of the state of the cutting device 20. The control unit 40 and the operation unit 41 are electrically connected. In addition, the control unit 40 may also be responsible for controlling the tissue product manufacturing facility 10. In addition, a revolving motor 26 and a rotating motor 28 are electrically connected to the control unit 40. The operator of the cutting device 20 according to the present embodiment controls the operations of the revolving motor 26 and the like from the operation unit 41.

[0035] (Cutting Device 20 According to the Second Embodiment) FIG. 8 shows a control block diagram of the cutting device 20 according to the second embodiment. In the cutting device 20 according to the present embodiment, the reciprocating mechanism includes a disk-shaped cutting blade drive device 44 that moves the disk-shaped cutting blade M back and forth in the axial direction thereof.

[0036] As shown in FIG. 8, the cutting device 20 according to the present embodiment includes a control unit 40, an operation unit 41, a revolving motor 26, and a rotating motor 28, and these are electrically connected to the control unit 40. In addition, the cutting device 20 according to the present embodiment includes two disk-shaped cutting blades M, and also includes a revolving spindle rotation detector 42, two disk-shaped cutting blade position detectors 43, and two disk-shaped cutting blade drive devices 44, and these are electrically connected to the control unit 40.

[0037] In this embodiment, the rotation detector 42 for the revolving spindle is specifically an encoder, a resolver, or the like. Also, the disc-shaped cutting blade position detector 43 is a linear encoder, an encoder, or the like. Further, the disc-shaped cutting blade driving device 44 is a linear motor, a set of a servo motor capable of position detection and a ball screw, or the like.

[0038] In the cutting device 20 according to this embodiment, the rotation position of the revolving spindle detected by the rotation detector 42 for the revolving spindle is input to the control unit 40. Corresponding to the rotation position, the control unit 40 uses the disc-shaped cutting blade position detector 43 to control the position of the disc-shaped cutting blade M by the disc-shaped cutting blade driving device 44. By this disc-shaped cutting blade driving device 44, the disc-shaped cutting blade M can perform a reciprocating motion. At this time, an input portion for the operating distance of this reciprocating motion is provided on the screen of the operation unit 41. In this embodiment, this input portion is a mechanism for changing the operating distance of the reciprocating mechanism.

Explanation of Reference Numerals

[0039] 10 Tissue product manufacturing facility 11 Folding section 20 Cutting device 32 Coupling member 33 Revolving reference member 50 Conveyor LS Sheet laminate M Disc-shaped cutting blade R Raw material roll TS Tissue product

Claims

1. A cutting device for cutting a tissue product of a predetermined length from a sheet laminate, the cutting device cuts the tissue product by synchronizing with the operation of the sheet laminate, the cutting device, two or more disc-shaped cutting blades, a revolving mechanism that includes the two or more disc-shaped cutting blades and revolves the two or more disc-shaped cutting blades around a revolving axis, a reciprocating mechanism that can reciprocate the disc-shaped cutting blade once in the axial direction of the disc-shaped cutting blade in accordance with one revolution of the revolving mechanism, and a mechanism for changing the operating distance of the reciprocating mechanism, wherein the operating distance of the reciprocating mechanism is changed by the changing mechanism, so that the length of the tissue product in the operating direction is changed, characterized in that it is a cutting device.

2. The reciprocating mechanism, can reciprocate the disc-shaped cutting blade in the axial direction of the disc-shaped cutting blade by inclining a revolving plane including the revolving orbit of the disc-shaped cutting blade by the revolving mechanism by a predetermined angle with respect to the axial direction of the disc-shaped cutting blade, furthermore, the reciprocating mechanism, a link mechanism including the two or more disc-shaped cutting blades, a revolving reference member for determining the inclination angle of the revolving plane, and a coupling member for coupling the link mechanism and the revolving reference member, the revolving plane inclines in accordance with the inclination of the revolving reference member, the changing mechanism changes the inclination angle of the revolving reference member, characterized in that it is the cutting device according to Claim 1.

3. A folding section for manufacturing a sheet laminate from a raw roll, a conveyor for conveying the sheet laminate, and the cutting device according to Claim 1 for cutting a tissue product of a predetermined length from the sheet laminate, characterized in that it is a tissue product manufacturing facility.

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