JP5895107B1 - Seat fixing method and sheet fixing device - Google Patents

Abstract

A sheet fixing method for fixing a sheet relating to an absorbent article, wherein a cutter unit cuts a continuous sheet in which display elements are repeatedly provided between the display elements to generate a single sheet, and the generated single sheet Moving the sheet to the merge position with the other sheet, and moving the single sheet to the other sheet so that the cut rear end of the single sheet is located at a predetermined position of the other sheet. Fixing the sheet, conveying the continuous sheet in the conveying direction toward the cutter unit, obtaining deviation information from a reference position of the display element provided on the continuous sheet, and the deviation information Changing the conveying speed of the continuous sheet based on the above, obtaining the fluctuation information of the length of the single sheet, and controlling the cutter unit based on the fluctuation information. Characterized in that it is having a changing said predetermined position.

Description

  The present invention relates to a sheet fixing method and a sheet fixing apparatus.

  A sheet fixing apparatus for fixing a sheet relating to an absorbent article is already well known. In such a sheet fixing device, a continuous sheet in which display elements are repeatedly provided is cut between the display elements to generate a single-leaf sheet, and the generated single-leaf sheet is merged with other sheets. A fixed part that fixes the single sheet to another sheet at a joining position so that the cut end of the single sheet is positioned at a predetermined position of the other sheet, and a conveying direction of the continuous sheet toward the cutter unit And a transport unit that transports the paper to the head.

International Publication No. 2010/150357

  Some of such sheet fixing devices are provided with a shift information acquisition unit for acquiring shift information from a reference position of a display element provided in a continuous sheet. In the sheet fixing apparatus provided with such a deviation information acquisition unit, the length of the continuous sheet (that is, the division unit length when cutting the continuous sheet) is changed by slight expansion and contraction of the continuous sheet. The deviation information acquired by the deviation information acquisition unit so that the continuous sheet can be cut to an appropriate length according to the fluctuation (that is, a single-leaf sheet having a length corresponding to the fluctuation is generated). Based on the above, control is performed to change the conveying speed of the continuous sheet by the conveying unit.

  However, when the appropriately cut single-leaf sheet is fixed to another sheet, there has been a problem that the position of the single-leaf sheet is shifted in the product.

  The present invention has been made in view of the above problems, and an object of the present invention is to cope with a problem that the position of a single-leaf sheet is shifted in a product.

The main invention for achieving the above object is a sheet fixing method for fixing a sheet according to an absorbent article,
A cutter unit cuts a continuous sheet provided with display elements repeatedly between the display elements to generate a single sheet,
Moving the generated single-leaf sheet to a merging position with another sheet;
Fixing the single-leaf sheet to the other sheet at the merging position so that a cut rear end of the single-leaf sheet is located at a predetermined position of the other sheet;
Conveying the continuous sheet in the conveying direction toward the cutter unit;
Obtaining deviation information from a reference position of the display element provided in the continuous sheet;
Changing the conveying speed of the continuous sheet based on the deviation information;
Obtaining fluctuation information of the length of the single leaf sheet;
Based on the variation information, controlling the cutter unit and changing the predetermined position;
A sheet fixing method characterized by comprising:

  Other features of the present invention will become apparent from the description of the present specification and the accompanying drawings.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to cope with the problem which the position of a single leaf sheet shifts in a product.

It is a top view of the development state of diaper 1 concerning this embodiment. Drawing 2A-Drawing 2C are exploded explanatory views of each part of diaper 1 concerning this embodiment. FIG. 2A is an exploded explanatory view of the front portion 3. FIG. 2B is an exploded explanatory view of the crotch portion 5. FIG. 2C is an exploded explanatory view of the rear portion 7. It is the schematic diagram which showed a part of manufacturing apparatus 50 of the diaper 1. FIG. It is the block diagram which showed a part of manufacturing apparatus 50 of the diaper 1. FIG. It is the schematic diagram which showed a mode that the cutter 61a cuts the leak-proof sheet base material 100. FIG. It is explanatory drawing for demonstrating the problem which concerns on the cut of the leak-proof sheet base material. It is the figure which showed the flowchart of conveyance control of the leak-proof sheet base material. It is explanatory drawing for demonstrating the problem which the position of the single-leaf leak-proof sheet | seat 104 shifts | deviates in a product. It is the figure which showed the flowchart of cut control of the leak-proof sheet base material. It is the conceptual diagram which showed the example which controls the cutter roller 61 and changes the predetermined position P based on fluctuation information. It is the figure which showed the flowchart of conveyance control of the leak-proof sheet base material 100 which concerns on a modification. It is the conceptual diagram which showed the example which changes a 1st reference position based on the change information which changes the predetermined position P.

  At least the following matters will become apparent from the description of the present specification and the accompanying drawings.

A sheet fixing method for fixing a sheet according to an absorbent article,
A cutter unit cuts a continuous sheet provided with display elements repeatedly between the display elements to generate a single sheet,
Moving the generated single-leaf sheet to a merging position with another sheet;
Fixing the single-leaf sheet to the other sheet at the merging position so that a cut rear end of the single-leaf sheet is located at a predetermined position of the other sheet;
Conveying the continuous sheet in the conveying direction toward the cutter unit;
Obtaining deviation information from a reference position of the display element provided in the continuous sheet;
Changing the conveying speed of the continuous sheet based on the deviation information;
Obtaining fluctuation information of the length of the single leaf sheet;
Based on the variation information, controlling the cutter unit and changing the predetermined position;
A sheet fixing method comprising the steps of:

  According to such a sheet fixing method, it is possible to cope with a problem that the position of the single sheet in the product is shifted.

Such a sheet fixing method,
It is desirable to further change the reference position based on change information for changing the predetermined position.

  According to such a sheet fixing method, it is possible to cope with such a problem when only the single sheet is moved and the display element is not moved as much as possible.

Such a sheet fixing method,
When changing the reference position,
It is desirable to change the reference position by the same amount as the change amount of the predetermined position.

  According to such a sheet fixing device, it is possible to cope with the problem with high accuracy when only the single-leaf sheet is moved and the display element is not desired to be moved as much as possible.

Such a sheet fixing method,
Obtaining the deviation information is obtaining first deviation information from a first reference position of the display element provided in the continuous sheet,
When obtaining the fluctuation information,
It is desirable to acquire the variation information by obtaining second deviation information from the second reference position of the display element provided on the single-leaf sheet.

  According to such a sheet fixing method, variation information can be acquired with higher accuracy.

Such a sheet fixing method,
When obtaining the fluctuation information,
It is desirable that the display element provided on the single-leaf sheet is photographed with a camera and the second shift information is obtained based on the photographed display element.

  According to such a sheet fixing method, even if the display element is complicated, it is possible to appropriately cope with the problem that the position of the single sheet in the product is shifted.

Such a sheet fixing method,
When obtaining the fluctuation information,
It is desirable to obtain the variation information by obtaining the length of the single sheet from the deviation information.

  According to such a sheet fixing method, the number of parts can be reduced.

Such a sheet fixing method,
When changing the predetermined position,
It is preferable that half of the obtained fluctuation amount is the change amount of the predetermined position.

  According to such a sheet fixing method, the single-leaf sheet can be positioned at a more appropriate position on the product.

Next, a sheet fixing device for fixing a sheet according to the absorbent article,
A cutter unit that cuts a continuous sheet provided with display elements repeatedly between the display elements to generate a single-leaf sheet;
The generated single leaf sheet is moved to a joining position with another sheet, and the single leaf sheet is moved to the other sheet so that a cut rear end of the single leaf sheet is located at a predetermined position of the other sheet. A fixing part to be fixed at the joining position;
A transport unit that transports the continuous sheet in the transport direction toward the cutter unit;
A deviation information acquisition unit for acquiring deviation information from a reference position of the display element provided in the continuous sheet;
A control unit that changes a conveyance speed of the continuous sheet by the conveyance unit based on the deviation information acquired by the deviation information acquisition unit,
A fluctuation information acquisition unit that acquires fluctuation information of the length of the single leaf sheet,
The control unit is configured to control the cutter unit and change the predetermined position based on the variation information acquired by the variation information acquisition unit.

  According to such a sheet fixing device, it is possible to cope with a problem that the position of the single sheet in the product is shifted.

=== About the outline of the disposable diaper according to the present embodiment ===
The disposable diaper as an example of the absorbent article according to the present embodiment is a tape-type (open type) disposable diaper (hereinafter also simply referred to as diaper 1).

  FIG. 1 is a plan view of a developed state of the diaper 1 (meaning a state where the diaper 1 is stretched so as not to be wrinkled) according to the present embodiment. Drawing 2A-Drawing 2C are exploded explanatory views of each part of diaper 1 concerning this embodiment. FIG. 2A is an exploded explanatory view of the front portion 3. FIG. 2B is an exploded explanatory view of the crotch portion 5. FIG. 2C is an exploded explanatory view of the rear portion 7.

  The diaper 1 of this Embodiment has the front part 3, the crotch part 5, and the rear part 7, as shown in FIG. The front part 3 is a part (girth circumference part) which will be located in a wearer's front part (abdominal side). Moreover, the rear part 7 is a part (waistline part) which will be located in a wearer's rear part (back side). The crotch part 5 is a part that is located between the front part 3 and the rear part 7.

  In the following description, each direction is defined as shown in FIG. That is, the direction from the front part 3 toward the rear part 7 is referred to as “product longitudinal direction L”, and the direction intersecting with the product longitudinal direction L is referred to as “product width direction W”. 1 is a line indicating the center of the diaper 1 in the product longitudinal direction L (referred to as the diaper center CL). In addition, as shown in FIG. 2, the direction intersecting the product longitudinal direction L and the product width direction W is “thickness direction”, the wearer's skin side is “skin side”, and the opposite side is “non-skin side” "

  The diaper 1 includes an absorbent body 21, a top sheet 22, a leak-proof sheet 23, a back sheet 24, a skin side sheet 26, a waist gather film 28, a fastening tape 30, and a target tape 29. .

  The absorber 21 is for absorbing a liquid. That is, the absorber 21 is a member (absorbent core) formed by laminating a liquid absorbent material capable of absorbing excrement such as urine, and is disposed over the front portion 3, the crotch portion 5, and the rear portion 7. ing. The area displayed by the shaded portion in FIG. 1 indicates the area occupied by the absorber 21.

  The absorber 21 has a rectangular shape. However, the shape of the absorber 21 is not limited to the shape shown in FIG. Moreover, the absorber 21 should just be provided in the crotch part 5 at least.

  The absorber 21 is wrapped in a core wrap 25 made of a liquid permeable sheet (nonwoven fabric), and is disposed between the top sheet 22 and the leak-proof sheet 23 in the thickness direction. As a liquid absorptive material which constitutes absorber 21, liquid absorptive granular materials, such as liquid absorptive fibers, such as pulp fiber, and a superabsorbent polymer, for example, can be used. Moreover, liquid absorptive materials other than a liquid absorptive fiber and a liquid absorptive granular material may be included.

  The top sheet 22 is a liquid-permeable member disposed on the skin side of the absorbent body 21.

  The leak-proof sheet 23 is a liquid-impermeable member disposed on the non-skin side of the absorber 21. A display element such as a character pattern is printed on the non-skin side of the leakproof sheet 23.

  The back sheet 24 is a member (exterior sheet) that constitutes the exterior of the diaper 1 on the non-skin side, and is composed of, for example, a nonwoven fabric. A back sheet 24 is disposed on the non-skin side of the leak-proof sheet 23 (see FIGS. 2A to 2C).

  Moreover, the flap part 14 is provided in the both sides of the product width direction W of the diaper 1, and the rear part 7. As shown in FIG. This flap part 14 is mainly comprised from the skin side sheet | seat 26 and the back seat | sheet 24 (refer FIG. 2C). The skin side sheet 26 is a skin side member formed over the front part 3, the crotch part 5 and the rear part 7, and is made of, for example, a nonwoven fabric. The skin side sheet 26 is also a member constituting a leg side gather 16 (corresponding to a three-dimensional gather) to be described later, and a portion outside the skin side sheet 26 constitutes the flap portion 14.

  In addition, a pair of leg gathers 15 (leg extension / contraction portions) that extend and contract in the product longitudinal direction L are provided along the product longitudinal direction L at the edge portion that forms the leg opening of the diaper 1. In the present embodiment, the leg gather 15 is made of a thread rubber provided between the skin side sheet 26 and the back sheet 24, and this thread rubber imparts elasticity to the skin side sheet 26 and the back sheet 24. Yes. The rubber thread is provided from the front part 3 to the rear part 7 in the product longitudinal direction L. In addition, the leg gather 15 is not restricted to comprising with a rubber thread, For example, it is good also as comprising with an elastic sheet (film).

  Further, in the product width direction W, a pair of leg side gathers 16 extending and contracting in the product longitudinal direction L are provided along the product longitudinal direction L inside the leg gathers 15. The leg side gathers 16 are for preventing liquid leakage from the gaps between the leg rolls, and are mainly composed of the inner part of the skin side sheet 26.

  The leg side gathers 16 (skin-side sheets 26) are joined at end joints 17 (rectangular portions in FIG. 1) located at both ends in the product longitudinal direction L. Moreover, only the outer part in the product width direction W is joined (referred to as the main body joint portion 18a) between the pair of end joint portions 17 (hereinafter referred to as the main body portion 18 for convenience). Therefore, the main body portion 18 is in a pocket shape surrounded by the pair of end joint portions 17 and the main body joint portion 18a, and rises with the main body joint portion 18a as a fulcrum. In addition, since the rubber thread 19 is provided in the inner side part in the product width direction W of the main-body part 18, the said inner side part has a stretching property. Thus, the leg side gathers 16 are composed of the end joint portions 17 and the main body portions 18, and are provided from the front portion 3 to the rear portion 7 in the product longitudinal direction L like the leg gathers 15.

  Moreover, in the rear part 7, the waist gathers film 28 is arrange | positioned between the absorber 21 and the back seat | sheet 24 (refer FIG. 2C). The waist gather film 28 is a band-shaped member that expands and contracts along the product width direction W. The waist gather film 28 is configured by the waist gather film 28 imparting stretchability to the back sheet 24 and the like. The length of the waist gather film 28 in the product width direction W is longer than that of the absorber 21. For this reason, the waist gathers are formed so as to protrude from the absorbent body 21 to the outside in the product width direction W.

  The pair of fastening tapes 30 are fixed to the flap portion 14 of the rear portion 7 by a fixing portion 32. In the present embodiment, the fastening tape 30 is attached by sandwiching a part of the fastening tape 30 between the skin-side sheet 26 and the back sheet 24 constituting the flap portion 14 (see FIG. 2C). .

  The fastening tape 30 includes the fixing portion 32 and the engaging portion 31. And when the said engaging part 31 engages with the target tape 29 mentioned later, the wearer can wear the diaper 1 now. The width of the fixed portion 32 in the product longitudinal direction L is larger than the width of the engaging portion 31 in the product longitudinal direction L. In the present embodiment, a hook-and-loop fastener is provided in part of the engaging portion 31.

  The target tape 29 is disposed on the non-skin side of the back sheet 24 of the front portion 3 (see FIG. 2A). The target tape 29 is a member that can be engaged with the fastening tape 30 and is formed of, for example, a nonwoven fabric. The target tape 29 according to the present embodiment is a rectangular member along the product width direction W as shown in FIG.

=== About the manufacturing apparatus 50 of the diaper 1 ===
Next, the manufacturing apparatus 50 of the diaper 1 mentioned above is demonstrated.

  In the present embodiment, the long sheet-shaped leak-proof sheet substrate 100 is cut, and the cut leak-proof sheet substrate 100 is bonded to the long sheet-shaped back sheet substrate 110. Then, a target tape substrate is further bonded to the leak-proof sheet substrate 100 and the back sheet substrate 110 that are bonded together. Then, other base materials (absorber 21, top sheet base material, skin side sheet base material, etc.) are pasted on the base material on which the three are pasted, and finally cut into a product shape.

  In the following description, a part for fixing the sheet (sheet fixing apparatus) in the manufacturing apparatus 50, that is, a part for fixing the cut leakage prevention sheet base material 100 to the back sheet base material 110 will be mainly described with reference to FIGS. Will be described. FIG. 3 is a schematic view showing a part of the manufacturing apparatus 50 for the diaper 1. FIG. 4 is a block diagram showing a part of the manufacturing apparatus 50 for the diaper 1. FIG. 5 is a schematic diagram showing how the cutter 61a cuts the leak-proof sheet substrate 100.

  The manufacturing apparatus 50 (sheet fixing apparatus) includes a conveyance unit 52, a cutter roller 61 (corresponding to a cutter unit), an anvil roller 62, an adhesive application unit 63, a dancer unit 64, a controller 70, and a detector group. And.

  The conveyance unit 52 is a unit related to conveyance of the leak-proof sheet substrate 100, and includes a first conveyance unit 54 to a third conveyance unit 58 that conveys the leak-proof sheet substrate 100 in the conveyance direction, and a plurality of free rolls (driven) Roller). In addition, the leak-proof sheet base material 100 is wound around a winding shaft (not shown), and when the leak-proof sheet base material 100 is transported by the transport unit 52, the leak-proof sheet base material 100 is drawn out from the roll shaft. It has become.

  The first transport unit 54 (corresponding to the transport unit) is a transport unit that transports the leak-proof sheet substrate 100 in the transport direction toward the cutter roller 61. The first transport unit 54 is provided upstream and immediately before the cutter roller 61 in the transport direction.

  The first transport unit 54 is a belt conveyor that transports the leak-proof sheet base material 100 in a state of being in contact with the leak-proof sheet base material 100, and a first drive roller 54a that is driven by a motor (not shown); The first driven roller 54b is located downstream of the first drive roller 54a in the transport direction, and the first drive roller 54a and a belt 54c stretched over the first driven roller 54b. The belt 54c is moved by the rotation of the first drive roller 54a driven by the motor, and the leak-proof sheet substrate 100 in contact with the belt 54c is conveyed. In addition, the 1st conveyance part 54 which concerns on this Embodiment is a suction conveyor, and the leak-proof sheet base material 100 which is contacting the belt 54c is conveyed in the state adsorb | sucked to the belt 54c. It has become.

  The 2nd conveyance part 56 is a conveyance part which is provided in the upstream from the 1st conveyance part 54 and the 3rd conveyance part 58 mentioned later in a conveyance direction, and conveys the leak-proof sheet base material 100 in a conveyance direction. The second transport unit 56 is provided upstream and immediately before the dancer unit 64 (dancer unit 65) in the transport direction.

  The 2nd conveyance part 56 is arrange | positioned so that the 2nd drive roller 56a driven by the motor not shown may oppose the said 2nd drive roller 56a on both sides of the leak-proof sheet base material 100 And a roller 56b. And when the 2nd drive roller 56a driven with the motor rotates, the leak-proof sheet base material 100 which is contacting the 2nd drive roller 56a is conveyed.

  The third transport unit 58 is provided between the first transport unit 54 and the second transport unit 56 in the transport direction (in other words, between the first transport unit 54 and the dancer unit 64 (dancer unit 65)). The conveyance unit conveys the leak-proof sheet substrate 100 in the conveyance direction. The third transport unit 58 is provided upstream and immediately before the adhesive application unit 63 in the transport direction.

  Similarly to the second transport unit 56, the third transport unit 58 is also opposed to a third drive roller 58a driven by a motor (not shown) and the third drive roller 58a with the leakproof sheet base material 100 interposed therebetween. And a third driven roller 58b arranged as described above. And when the 3rd drive roller 58a driven by the motor rotates, the leak-proof sheet base material 100 which is contacting the 3rd drive roller 58a is conveyed.

  The cutter roller 61 is for cutting the long sheet-shaped leak-proof sheet substrate 100 conveyed by the conveyance unit 52 to generate the short sheet-shaped leak-proof sheet substrate 100. Here, for the sake of convenience, the long sheet-shaped leak-proof sheet base material 100 is a continuous leak-proof sheet 102 (corresponding to a continuous sheet), and the short sheet-shaped leak-proof sheet base material 100 after cutting is a single leaf leak-proof sheet 104 ( Equivalent to single leaf sheet). The continuous leak-proof sheet 102 is repeatedly provided with the display elements described above, and the cutter roller 61 cuts the continuous leak-proof sheet 102 between the display elements. Note that “cutting the continuous leak-proof sheet 102 between the display elements” does not mean that it is essential to cut the display elements at a portion where the display elements are not printed.

  The cutter roller 61 is provided with a cutter 61 a, and the anvil roller 62 is disposed so as to face the cutter roller 61 with the leakproof sheet base material 100 interposed therebetween. That is, the leak-proof sheet substrate 100 is positioned in the gap G between the cutter roller 61 and the anvil roller 62. The cutter 61a is provided on the outer peripheral surface of the cutter roller 61 so that the longitudinal direction of the cutter is along the rotation axis direction.

  Each of the cutter roller 61 and the anvil roller 62 is driven by a motor (not shown) and is rotatable. In addition, both rotation-axis directions are parallel.

  When the conveyance of the continuous leak-proof sheet 102 by the transport unit 52 is continued in a state where the cutter roller 61 and the anvil roller 62 are rotating, the portion of the continuous leak-proof sheet located downstream of the gap G in the transport direction. The length of 102 gradually increases, and the cutter 61a eventually reaches the gap G (that is, the position facing the anvil roller 62) by the rotation of the cutter roller 61 (see FIG. 5). When the cutter 61a reaches the gap G, the continuous leak-proof sheet 102 is cut and a single-leaf leak-proof sheet 104 is generated.

  The anvil roller 62 (corresponding to the fixed portion) carries the generated single-leaf leak-proof sheet 104 and moves it to the joining position C with the back sheet base 110, and joins the single-leaf leak-proof sheet 104 to the back sheet base 110. Fix at position C. That is, the generated single-leaf leak-proof sheet 104 moves with the rotation of the anvil roller 62 while being placed on the anvil roller 62, and eventually reaches the joining position C with the backsheet substrate 110. And the single-leaf leak-proof sheet 104 will be bonded by the back seat | sheet base material 110 in the said joining position.

  In the present embodiment, the circumference of the anvil roller 62 is set to be twice the circumference of the cutter roller 61. Further, the half circumference of the anvil roller 62 (perimeter of the cutter roller 61) is the length in the product longitudinal direction L of one piece of the product (diaper 1) (this length is represented by the symbol L1. In other words, the back The length of the sheet 24 in the product longitudinal direction L) is set to be the same.

  Therefore, while the cutter roller 61 makes one turn (the anvil roller 62 makes a half turn), the fixing operation of the single-leaf leak-proof sheet 104 to the backsheet base 110 corresponding to the length L1 of one piece of the product (diaper 1) is performed. Is called. Therefore, when cutting the continuous leak-proof sheet 102 in the state shown in FIG. 5, the length in the conveyance direction from the tip E1 of the continuous leak-proof sheet 102 to the cutting position (in other words, the position of the gap G). However, the length of the leak-proof sheet 23 in one piece of the product (diaper 1) (this length is represented by the symbol L2, naturally, the size of L2 is smaller than L1) is continuous. The leak-proof sheet 102 is conveyed.

  In addition, the leak-proof sheet base material 100 (continuous leak-proof sheet 102) is also manufactured on the assumption that it is cut for each length L2 of the leak-proof sheet 23. That is, the display element described above is repeatedly printed on the continuous leak-proof sheet 102 so that the division unit length of the continuous leak-proof sheet 102 is the length L2. In other words, the display elements are repeatedly printed at a pitch of length L2 (see the upper diagram in FIG. 6).

  The adhesive application unit 63 applies an adhesive for bonding the leak-proof sheet substrate 100 (single-leaf leak-proof sheet 104) to the back sheet substrate 110 to the leak-proof sheet substrate 100 (continuous leak-proof sheet 102). Is to do. The adhesive application unit 63 is provided between the first conveyance unit 54 and the third conveyance unit 58 in the conveyance direction. In other words, the adhesive application unit 63 is provided on the downstream side and immediately after the third conveyance unit 58 in the conveyance direction. In addition, the adhesive application part 63 which concerns on this Embodiment applies a hot melt adhesive to the leak-proof sheet base material 100. FIG.

  The dancer unit 64 is for controlling the tension (tension) of the leak-proof sheet base material 100 in cooperation with the above-described second transport unit 56. The dancer unit 64 includes a dancer unit 65 and a position information acquisition unit 66.

  The dancer portion 65 can change its position (in the present embodiment, the position in the vertical direction). That is, the dancer unit 65 can move in the vertical direction. The dancer unit 65 is provided between the first transport unit 54 and the second transport unit 56 in the transport direction.

  The position information acquisition unit 66 is for acquiring the position information of the dancer unit 65. The position information acquisition unit 66 according to the present embodiment is a position detection sensor that detects the position of the dancer unit 65 in the vertical direction.

  Here, how to control the tension will be described. The second conveyance unit 56 conveys the leak-proof sheet base material 100 in the conveyance direction. As described above, the second conveyance unit 56 is provided upstream and immediately before the dancer unit 64 (dancer unit 65). In cooperation with, the tension of the leak-proof sheet substrate 100 is controlled. That is, the position information acquisition unit 66 (position detection sensor) of the dancer unit 64 outputs the acquired position information of the dancer unit 65 to the controller 70 described later at a predetermined timing. And the controller 70 changes the conveyance speed of the continuous leak-proof sheet | seat 102 by the 2nd conveyance part 56 based on the said positional information. For example, the controller 70 changes the conveyance speed so that the dancer unit 65 is located at a predetermined reference position. When the dancer unit 65 is positioned higher than the reference position, the transport speed is increased so that the dancer unit 65 is lowered. On the contrary, when the dancer part 65 is located at a position lower than the reference position, the transport speed is lowered so that the dancer part 65 is raised. As a result, the tension (tension) of the leak-proof sheet substrate 100 can be controlled.

  The controller 70 is a control unit (control unit) for controlling the manufacturing apparatus 50 (sheet fixing apparatus). The controller 70 has a CPU, a memory, and the like. The CPU is an arithmetic processing unit for controlling the entire manufacturing apparatus 50 (sheet fixing apparatus). The memory is used to secure an area for storing a CPU program, a work area, and the like. The CPU controls each unit in accordance with a program stored in the memory.

  The detector group outputs the detection result to the controller 70. The controller 70 controls each unit based on the detection result output from the detector group. In the present embodiment, as the detector group, two cameras, that is, a camera (referred to as the first camera 72) for detecting a display element provided on the continuous leak-proof sheet 102 before cutting, and after the cutting A camera (referred to as a second camera 74) that detects display elements provided on the single-leaf leak-proof sheet 104 is provided. Note that how these cameras are used will be described later. The dancer unit 64 (position information acquisition unit 66) described above is also one of the detector groups.

=== Conveyance Control of Leakproof Sheet Substrate 100 by First Conveying Unit 54 ===
Next, conveyance control of the leak-proof sheet substrate 100 by the first conveyance unit 54 will be described. Note that the conveyance control related to the third conveyance unit 58 is the same as the conveyance control related to the first conveyance unit 54. That is, the transport speed by the first transport unit 54 and the transport speed by the third transport unit 58 are controlled to always be the same speed. Therefore, the description of the conveyance control related to the third conveyance unit 58 is omitted. Further, the conveyance control related to the second conveyance unit 56 is as already described.

  FIG. 6 is an explanatory diagram for explaining a problem associated with cutting the leak-proof sheet substrate 100. FIG. 7 is a view illustrating a flowchart of conveyance control of the leak-proof sheet substrate 100.

  As described above, the leak-proof sheet substrate 100 (continuous leak-proof sheet 102) is designed on the assumption that the leak-proof sheet 23 is cut for each length L2. That is, the display element described above is repeatedly printed on the continuous leak-proof sheet 102 so that the division unit length of the continuous leak-proof sheet 102 is the length L2. In other words, the display elements are repeatedly printed at a pitch of length L2.

  However, since the leak-proof sheet base material 100 is wound around the winding shaft, the leak-proof sheet base material 100 positioned radially inside the winding shaft is strongly wound, and the leak-proof sheet base material 100 positioned radially outside is loose. Will be rolled up. Therefore, an event may occur in which the division unit length (the pitch of the display elements) differs between the radially inner side and the radially outer side. That is, since the leak-proof sheet base material 100 slightly expands and contracts and the degree of expansion / contraction differs between the radially inner side and the radially outer side, such an event occurs.

  Such a phenomenon may also occur when the leak-proof sheet base material 100 is not wound around the winding shaft but is fed out and conveyed from the winding shaft. That is, in such a case, since the leak-proof sheet base material 100 is accelerated and decelerated, the tensile force on the leak-proof sheet base material 100 differs due to this acceleration and deceleration. In particular, immediately after the leak-proof sheet base material 100 wound around the winding shaft is lost and replaced with a new one, the leak-proof sheet base material 100 is suddenly accelerated from the stopped state, so that a strong tensile force is applied. Thus, even if acceleration / deceleration of the leak-proof sheet substrate 100 occurs, an event occurs in which the division unit length (the pitch of the display elements) varies depending on the location.

  The upper view of FIG. 6 shows the state of the leak-proof sheet substrate 100 when the above-described event has not occurred. In the leak-proof sheet substrate 100, the division unit length and the pitch of the display elements are constant (length L2) everywhere. For the sake of simplicity, the display elements are represented by double circles of black circles and white circles located at the center of the division unit for the sake of convenience.

  On the other hand, the lower diagram of FIG. 6 shows the state of the leak-proof sheet substrate 100 when the event occurs. In the leak-proof sheet base material 100, the division unit length and the pitch of the display elements are gradually increased from the right to the left. In addition, the display element itself also shifts from the time when the event does not occur as it goes from right to left. FIG. 6 is an image diagram for easy understanding and is different from an actual state.

  Here, as shown in the above example, when the continuous leak-proof sheet 102 is cut, the length in the transport direction from the tip E1 of the continuous leak-proof sheet 102 to the cut position (gap G) is a predetermined length. That is, it is necessary to be the length L2 of the leak-proof sheet 23 in one piece of the product (diaper 1). Therefore, when the event does not occur, the conveyance speed of the continuous leak-proof sheet 102 by the first conveyance unit 54 may be set so as to be the length L2. For example, if the conveyance speed is constant and the time from cutting the continuous leak-proof sheet 102 to the next cut is T seconds, the conveyance speed may be set to L2 / T. Become.

  However, when the above event occurs, if the conveyance is performed so that the length from the tip E1 to the gap G is always L2, appropriate cutting can be performed as shown by the upward arrow in the lower diagram of FIG. Disappear.

  Therefore, in the present embodiment, in order to perform an appropriate cut, that is, a cut corresponding to a change in the division unit length due to the occurrence of the event, the first display element provided in the continuous leak-proof sheet 102 is used. Based on the acquired first deviation information, the first deviation information acquisition unit (in the present embodiment, configured by the first camera 72 and the controller 70) acquires the first deviation information from the reference position. Thus, the conveyance speed of the continuous leak-proof sheet 102 by the first conveyance unit 54 is changed.

  This will be described with reference to the flowchart of FIG. First, the display element is photographed by the first camera 72 at a predetermined timing (step S1). The display element may be captured as a whole or a part thereof. Here, a description will be given based on an example in which a black circle located at the center of the division unit is an imaging target. Further, the timing may be a regular (constant) timing, but as an example, a proximity sensor that detects that the cutter 61a is approaching the gap G or the like is installed, and the signal of the proximity sensor is used. An example of shooting based on this can be given. Further, as shown in FIG. 3, the first deviation information acquisition unit (first camera 72) is a display element located on a portion of the continuous leak-proof sheet 102 that is in contact with the first conveyance unit 54 (that is, the belt conveyor). Is to be detected.

  Next, the first camera 72 outputs the photographing result (the photographed display element) to the controller 70 (step S3), and the controller 70 analyzes the image (step S5). The controller 70 then analyzes the first deviation of the display element (black circle) from the first reference position (that is, the position where the display element (black circle) should be located when the event has not occurred). Information is acquired (step S7). In the present embodiment, when the transport direction is the positive (plus) direction, how much the display element (black circle) is displaced in the plus (minus) direction from the first reference position (first deviation amount). Obtained as first deviation information.

  Next, the controller 70 changes the conveyance speed of the continuous leak-proof sheet 102 by the 1st conveyance part 54 based on the 1st deviation information which the 1st deviation information acquisition part acquired (step S9).

  For example, if the display element (black circle) is shifted by a from the first reference position in the negative direction (when it is delayed from the first reference position), the cut position (gap between the front end E1 of the continuous leak-proof sheet 102). The conveyance speed of the continuous leak-proof sheet 102 by the first conveyance unit 54 is set (increased) so that the length in the conveyance direction up to G) becomes L2 + a. For example, if the conveyance speed is constant and the time from the continuous leak-proof sheet 102 to the next cut is T seconds, the conveyance speed is set to (L2 + a) / T. On the other hand, if the display element (black circle) is shifted by a from the first reference position in the plus direction (when preceding the first reference position), the cut position from the front end E1 of the continuous leak-proof sheet 102 The conveyance speed of the continuous leak-proof sheet 102 by the first conveyance unit 54 is set (lowered) so that the length in the conveyance direction up to (gap G) is L2-a.

  In the present example, the acquired first deviation amount a and the amount a that is added to or subtracted from L2 are set to the same value, but the present invention is not limited to this, and different amounts may be used.

  In addition, although the example of acquiring the first deviation amount is given as the first deviation information, the first deviation amount is not obtained, but only the information of plus or minus (leading or lagging) is obtained. May be. In such a case, a constant value (a uniform value) is subtracted from L2 if positive, and a constant value (a uniform value) is added to L2 if negative. Good.

  Further, a threshold value may be provided for the first deviation amount a, and when the threshold value is exceeded, addition or subtraction may be performed on L2. Moreover, it is good also as calculating | requiring the average value of the 1st deviation | shift amount for the past several times, and adding or subtracting with respect to L2 based on the calculated | required average value.

  And when the cutter 61a reaches the said gap G, the continuous leak-proof sheet 102 will be cut by the length after correction | amendment (for example, L2 + a or L2-a), and the single-leaf leak-proof sheet according to the fluctuation | variation of division | segmentation unit length 104 is generated (step S11).

=== Regarding Cut Control of Leakproof Sheet Base Material 100 ===
FIG. 8 is an explanatory diagram for explaining a problem that the position of the single-leaf leak-proof sheet 104 is shifted in the product. FIG. 9 is a view showing a flowchart of cut control of the leak-proof sheet substrate 100. FIG. 10 is a conceptual diagram showing an example of changing the predetermined position P by controlling the cutter roller 61 based on the fluctuation information.

  As described above, in the present embodiment, even if the event occurs and a change in the division unit length occurs, an appropriate cut is realized according to the change (the length corresponding to the change). The single-leaf leak-proof sheet 104 is generated). However, when the single-leaf leak-proof sheet 104 is bonded to the back-sheet base material 110, the position of the single-leaf leak-proof sheet 104 in the back-sheet base material 110 (in other words, one piece of the product (diaper 1)) is Another problem may occur, that is, the position of the single-leaf leak-proof sheet 104 is shifted in the product.

  The other problem will be described with reference to FIG. 8 shows a state in which the single-leaf leak-proof sheet 104 is bonded to the back sheet base material 110. In addition, in order to simplify a figure, the display element is represented by the black circle located in the center part of the single-leaf leak-proof sheet 104 for convenience. Moreover, about the back sheet | seat base material 110, the back sheet | seat base material 110 for the length L1 of 1 piece of products (diaper 1) is represented.

  The upper diagram of FIG. 8 shows the situation when the event has not occurred. That is, since the division unit length of the continuous leak-proof sheet 102 does not vary and is a constant length L2, the above-described correction is not performed when the continuous leak-proof sheet 102 is cut, and the single-leaf leak-proof sheet 104 The length of is L2.

  On the other hand, the lower diagram of FIG. 8 shows a situation when the event occurs. That is, when the event occurs, the division unit length of the continuous leak-proof sheet 102 changes. Here, an example in which the division unit length varies and becomes longer (extended) will be described. And since the division | segmentation unit length became long, when the continuous leak-proof sheet | seat 102 is cut, the correction | amendment mentioned above is applied, and the single-leaf leak-proof sheet | seat 104 also becomes length (L2 + (DELTA)) longer than L2.

  Here, considering the position of the single-leaf leak-proof sheet 104 in the backsheet substrate 110 (product (diaper 1) 1 piece) while comparing the upper and lower views of FIG. Due to the different lengths of the single-leaf leak-proof sheet 104, both are located at different positions on the backsheet substrate 110 (one piece of product (diaper 1)), whereas the single-leaf leak-proof sheet 104 About the back end, all are located in the same position on the back sheet | seat base material 110 (product (diaper 1) 1 piece).

  Explaining this reason, the rear end of the single-leaf leak-proof sheet 104 corresponds to a cut portion when the continuous leak-proof sheet 102 is cut. That is, the rear end corresponds to a portion located in the gap G of the continuous leak-proof sheet 102 in FIG. On the other hand, the front end of the single-leaf leak-proof sheet 104 corresponds to the front end E1 of the continuous leak-proof sheet 102 in FIG.

  Here, as shown in FIG. 3 and FIG. 5, the anvil roller 62 moves the generated single-leaf leak-proof sheet 104 to the joining position C with the back sheet base material 110, but in this case, it was cut. The rear end moves from the gap G to the joining position C. And since this moving distance is constant irrespective of the fluctuation | variation of the division | segmentation unit length (length of the single-leaf leak-proof sheet 104) of the continuous leak-proof sheet 102, the rear end of the single-leaf leak-proof sheet 104 is influenced by the change. Without receiving, it will be located in the predetermined position (predetermined position) on the back sheet | seat base material 110 (product (diaper 1) 1 piece).

  On the other hand, when the anvil roller 62 moves the generated single-leaf leak-proof sheet 104 to the joining position C with the back sheet base 110, the tip of the single-leaf leak-proof sheet 104 is indicated by E1 in FIG. The position E1 varies according to the variation of the division unit length of the continuous leak-proof sheet 102 (the length of the single-leaf leak-proof sheet 104). For example, when the division unit length (the length of the single leaf leakage prevention sheet 104) is longer than L2, the position of E1 is also closer to the merge position C. Therefore, since the moving distance from the position E1 to the merging position C varies depending on the variation of the division unit length of the continuous leak-proof sheet 102 (the length of the single-leaf leak-proof sheet 104), the tip of the single-leaf leak-proof sheet 104 is Under the influence of the fluctuation, the back sheet base material 110 (product (diaper 1) 1 piece) is not located at a predetermined position (fixed position).

  As described above, in the present embodiment, the anvil roller 62 is configured such that the single-leaf leak-proof sheet 104 is placed on the back sheet so that the cut rear end of the single-leaf leak-proof sheet 104 is positioned at a predetermined position on the back sheet base 110. The base 110 is fixed at the joining position C. Therefore, as shown in FIG. 5, the position of the tip of the single-leaf leak-proof sheet 104 is moved by the variation in the length of the single-leaf leak-proof sheet 104. That is, as shown in FIG. 8, when the length of the single-leaf leak-proof sheet 104 changes from L2 to L2 + Δ, the position of the tip is shifted downstream in the transport direction by Δ.

  In such a case, the position of the single-leaf leak-proof sheet 104 shifts in the product (the position of the single-leaf leak-proof sheet 104 in the back sheet base 110 is different), as is apparent by comparing the upper and lower views of FIG. Problem arises. In the example of FIG. 8, the single-leaf leak-proof sheet 104 (see the upper diagram of FIG. 8) located in the center of the product is arranged so as to be biased to the plus side (downstream in the conveying direction) as a whole ( (See the lower diagram in FIG. 8).

  Therefore, in the present embodiment, measures are taken to suppress the occurrence of the deviation (bias). That is, the fluctuation information acquisition unit acquires the fluctuation information of the length of the single-leaf leak-proof sheet 104, and controls the cutter roller 61 based on the obtained fluctuation information to change the predetermined position. In the present embodiment, the fluctuation information acquisition unit (configured by the second camera 74 and the controller 70) is a second from the second reference position of the display element provided on the single leaf leakage prevention sheet 104. Fluctuation information is acquired by obtaining deviation information.

  This will be described with reference to the flowchart of FIG. First, the display element is photographed by the second camera 74 at a predetermined timing (step S1). The display element may be captured as a whole or a part thereof. Here, a description will be given based on an example in which a black circle (see FIG. 8) located at the center of the single-leaf leak-proof sheet 104 is an imaging target. Further, as shown in FIG. 3, the fluctuation information acquisition unit (second camera 74) photographs the display elements on the single-leaf leak-proof sheet 104 after the single-leaf leak-proof sheet 104 is bonded to the back sheet base 110 ( Detection).

Next, the second camera 74 outputs the photographing result (the photographed display element) to the controller 70 (step S3), and the controller 70 analyzes the image (step S5). The controller 70 then analyzes the second deviation of the display element (black circle) from the second reference position (that is, the position where the display element (black circle) should be located when the event has not occurred). Get information. In the present embodiment, when the transport direction is the positive (plus) direction, how much the display element (black circle) is displaced in the plus (minus) direction from the second reference position (second deviation amount). It is acquired as the second displacement information (for example, in the example of FIG. 8, the display element (black circle) is displaced in the plus direction, as is clear by comparing the upper diagram with the lower diagram). Then, the controller 70 can grasp the fluctuation information by obtaining the second deviation amount. For example, in the case where the photographed display element is a display element located in the center of the single-leaf leak-proof sheet 104 as shown in FIG. Fluctuation information is acquired from (Step S7)
Next, the controller 70 controls the cutter roller 61 based on the variation information to change the above-described predetermined position (that is, the position on the back sheet substrate 110 at the rear end where the single-leaf leak-proof sheet 104 is cut). (Step S9).

  Here, attention is focused on FIG. For example, as shown in the upper diagram of FIG. 10, when the length of the single-leaf leak-proof sheet 104 fluctuates in the positive direction (is longer), the single-leaf leak-proof sheet 104 is generally positive in the product. The single-leaf leak-proof sheet 104 is pasted to the back sheet base 110 in a state of being shifted to the plus side. Therefore, in order to cope with such a problem, as shown in the lower diagram of FIG. 10, the single-leaf leak-proof sheet 104 is arranged so that the single-leaf leak-proof sheet 104 is arranged on the minus side (upstream in the conveying direction) in the product. Change the position on the product. That is, the position of the single-leaf leak-proof sheet 104 on the back sheet substrate 110 is changed so that the single-leaf leak-proof sheet 104 is shifted to the minus side more than the state of the upper diagram of FIG. The upper diagram in FIG. 10 is the same diagram as the lower diagram in FIG. 9 (for the convenience of the following description, only the difference from L2 is changed from Δ to b).

  And in order to implement | achieve this, the control which changes the said predetermined position (namely, the position on the back sheet | seat base material 110 where the single-leaf leak-proof sheet | seat 104 was cut) shown by the symbol P in FIG. 10 is changed. Should be executed. In order to shift the predetermined position (rear end position) P to the minus side (upstream in the transport direction) as shown in the lower diagram of FIG. 10, the rotational speed of the cutter roller 61 is temporarily reduced, and the cutter roller 61 angle adjustment is performed. That is, by delaying the cut timing by a predetermined angle, when the cut rear end moves from the gap G to the merging position C (see FIG. 5), the back sheet base 110 is moved to a position downstream in the conveyance direction. Therefore, the predetermined position P can be shifted to the minus side (upstream in the conveying direction).

  More specifically, for example, as shown in FIG. 10, when the variation information indicates that the variation information varies by b in the plus direction (that is, the direction larger than L2), the predetermined position P is Control to shift to the minus side (upstream in the transport direction) by b / 2 is executed. Here, as described above, in the present embodiment, since the circumference of the cutter roller 61 corresponds to the length L1 of one piece of the product (diaper 1), the angle of the cutter roller 61 is set to the length L1 /. 360. Therefore, (b / 2) ÷ (L1 / 360) = 180 · b / L1 is the angle to be adjusted (the predetermined angle). That is, by temporarily slowing the rotation speed of the cutter roller 61 and shifting the angle of the cutter roller 61 by 180 · b / L1 degrees, the predetermined position P is reduced by b / 2 by the minus side (upstream in the transport direction). It will be shifted to.

  On the other hand, if the fluctuation information indicates that the fluctuation information fluctuates by b in the minus direction (that is, a direction smaller than L2), the predetermined position P is shifted to the plus side (downstream in the transport direction) by b / 2. Execute control. That is, by temporarily increasing the rotational speed of the cutter roller 61 and shifting the angle of the cutter roller 61 by 180 · b / L1 degrees, the predetermined position P is increased by b / 2 by the plus side (downstream in the transport direction). It will be shifted to.

  Note that after the rotational speed of the cutter roller 61 is temporarily reduced (increased) and the predetermined position P is changed, the speed of the cutter roller 61 returns to the normal speed (temporary change of the rotational speed is not possible). And only for adjusting the angle of the cutter roller 61). Moreover, even if the predetermined position P is changed because the conveyance control of the leak-proof sheet base material 100 by the first conveyance unit 54 described above works as is apparent by comparing the upper and lower diagrams of FIG. Based on this, the length of the single-leaf leak-proof sheet 104 is not changed (the length of the single-leaf leak-proof sheet 104 depends only on the conveyance control).

  In this example, when the fluctuation amount is b, the change amount of the predetermined position P is b / 2. This positions the single-leaf leak-proof sheet 104 at a more appropriate position on the back-sheet base material 110 (product) (in the example shown in FIG. 10, the single-leaf leak-proof sheet 104 is positioned at the center of the back-sheet base material 110. However, the present invention is not necessarily limited to an example in which half of the fluctuation amount is the change amount of the predetermined position P.

  Moreover, although the example which acquires the variation | change_quantity was given as fluctuation | variation information, you may make it acquire only the information of plus or minus, without acquiring the variation | change_quantity. In such a case, if it is positive, the predetermined position P is shifted to the negative side (upstream in the transport direction) by a constant value (uniform value). If it is negative, the predetermined position P (uniform value) ), The predetermined position P may be shifted to the plus side (downstream in the transport direction).

  Further, a threshold value may be provided for the fluctuation amount b, and the predetermined position P may be shifted when the threshold value is exceeded. Alternatively, an average value of the amount of fluctuation for the past several times may be obtained, and an amount by which the predetermined position P is shifted may be determined based on the obtained average value.

=== Effectiveness of Sheet Fixing Device and Sheet Fixing Method According to this Embodiment ===
As described above, in the present embodiment, the controller 70 controls the cutter roller 61 on the basis of the fluctuation information, and the predetermined position described above (that is, the back sheet base material at the rear end where the single leaf leakage preventing sheet 104 is cut). 110 position) was changed.

  Therefore, as described above, it is possible to cope with a problem that the position of the single-leaf leak-proof sheet 104 is shifted in the product.

  In the present embodiment, the first deviation information acquisition unit (when acquiring the first deviation information) takes a picture of the display element provided on the continuous leak-proof sheet 102 by the first camera 72 and takes the picture. The first deviation information is obtained based on the displayed elements.

  Therefore, even if the display element is complicated, the first deviation information can be acquired appropriately. Therefore, when the event occurs and a change in the division unit length occurs, a cut according to the change is more appropriately realized.

  Similarly, in the present embodiment, the variation information acquisition unit (when acquiring the variation information) has photographed the display element provided on the single leaf leakage prevention sheet 104 by the second camera 74. The second shift information is obtained based on the display element.

  Therefore, even if the display element is complicated, the second deviation information can be acquired appropriately. Therefore, it is possible to more appropriately cope with the problem that the position of the single-leaf leak-proof sheet 104 is shifted in the product.

  In the above embodiment, when the fluctuation amount is b, the change amount of the predetermined position P is b / 2. That is, half of the obtained fluctuation amount is set as the change amount of the predetermined position P.

  Therefore, as described above, the single-leaf leak-proof sheet 104 can be positioned at a more appropriate position on the back sheet base material 110 (product).

=== Regarding Modification of Conveyance Control of Leakproof Sheet Substrate 100 by First Conveying Unit 54 ===
Next, a modified example of conveyance control of the leak-proof sheet base material 100 by the first conveyance unit 54 will be described with reference to FIGS. 11 and 12. FIG. 11 is a diagram illustrating a flowchart of conveyance control of the leak-proof sheet base material 100 according to the modification. FIG. 12 is a conceptual diagram illustrating an example in which the first reference position is changed based on change information for changing the predetermined position P.

  In the example described above, as shown in FIG. 10, the position on the product of the single-leaf leak-proof sheet 104 is changed to an appropriate position by changing the predetermined position P by controlling the cutter roller 61 based on the fluctuation information. (The single-leaf leak-proof sheet 104 can be moved to an appropriate position on the product). However, in such a case, with the movement of the single-leaf leak-proof sheet 104, the display element (see the black circle in FIG. 10) provided on the single-leaf leak-proof sheet 104 also moves (shifts). Therefore, when only the single-leaf leak-proof sheet 104 is moved and the display element is not moved as much as possible, it is necessary to deal with such a problem.

  Therefore, in the modification, measures are taken to suppress the occurrence (shift) of the display element. That is, the above-described first reference position is changed based on the change information for changing the predetermined position P.

  This will be described with reference to the flowchart of FIG. First, as in the example shown in the flowchart of FIG. 7, the display element is photographed by the first camera 72 at a predetermined timing (step S1). The first camera 72 outputs the photographing result (the photographed display element) to the controller 70 (step S3), and the controller 70 analyzes the image (step S5). And the controller 70 acquires the 1st shift | offset | difference information from the 1st reference position of a display element (black circle) by the analysis of an image. In the present embodiment, when the transport direction is the positive (plus) direction, how much the display element (black circle) is displaced in the plus (minus) direction from the first reference position (first deviation amount). Obtained as first deviation information.

  Here, when acquiring the first deviation information from the first reference position of the display element (black circle), the controller 70 obtained in step S9 of the flowchart of FIG. 9 related to the cut control of the leak-proof sheet substrate 100. Based on the change information for changing the predetermined position P, the first reference position is changed (step S7). For example, when the change information indicates that the predetermined position P is shifted to the minus side (upstream in the transport direction) by b / 2 as shown in FIG. 10, as shown in the right diagram of FIG. The first reference position is shifted by b / 2 in the plus direction. Conversely, when the change information indicates that the predetermined position P is shifted to the plus side (downstream in the transport direction) by b / 2, the first reference position is minus as shown in the left diagram of FIG. Shift b / 2 in the direction.

  In this example, the first reference position is changed by the same amount as the change amount b / 2 of the predetermined position P. That is, although the change amount b / 2 of the predetermined position P and the amount b / 2 for shifting the first reference position are set to the same value, the present invention is not limited to this, and different amounts may be used.

  Thus, the controller 70 changes (shifts) the first reference position based on the change information for changing the predetermined position P, and the first deviation information of the display element (black circle) from the changed first reference position. Is acquired (step S9). That is, as shown in FIG. 12, the first reference position is shifted by an operation on the image (that is, a software operation), and the display element (black circle) moves in the plus (minus) direction from the shifted first reference position. (First deviation amount) is acquired as first deviation information. In addition, although the state where the display element (black circle) is located at the first reference position is shown in the upper diagram of FIG. 12 for the sake of convenience, the positions do not necessarily coincide with each other. As a matter of course, there is a case where both positions do not match before the first reference position is shifted.

  Next, similarly to the example shown in the flowchart of FIG. 7, the controller 70 determines the conveyance speed of the continuous leak-proof sheet 102 by the first conveyance unit 54 based on the first deviation information acquired by the first deviation information acquisition unit. Change (step S11). Then, when the cutter 61a reaches the gap G, the continuous leak-proof sheet 102 is cut by the corrected length, and the single-leaf leak-proof sheet 104 corresponding to the change in the division unit length is generated ( Step S13).

  As described above, in the present modification, the controller 70 uses the first conveyance unit based on the first deviation information from the first reference position acquired by the first deviation information acquisition unit (the first camera 72 and the controller 70). 54, the conveyance speed of the continuous leak-proof sheet 102 was changed. In this case, the first reference position is changed based on change information for changing the predetermined position P.

  That is, as shown in FIG. 10, when the predetermined position P (in other words, the single-leaf leak-proof sheet 104) is moved to the minus side (upstream in the conveying direction), the display element (see the black circle in FIG. 10) is also used. It moves to the minus side (upstream in the transport direction) (is displaced) And in order to suppress generation | occurrence | production of such a shift | offset | difference, as shown in the right figure of FIG. 12, a 1st reference position is shifted to a plus direction and a display element is delayed more. As a result, the conveyance speed of the continuous leak-proof sheet 102 by the first conveyance unit 54 is changed by the controller 70, and the display element is controlled to return from the state shifted to the minus side (upstream side in the conveyance direction). Become.

  On the other hand, when the predetermined position P (in other words, the single-leaf leak-proof sheet 104) is moved to the plus side (downstream in the transport direction), the display element is also moved to the plus side (downstream in the transport direction) (deviation). ) And in order to suppress generation | occurrence | production of such a shift | offset | difference, as shown in the left figure of FIG. 12, a 1st reference position is shifted to a minus direction and a display element is made to precede. As a result, the conveyance speed of the continuous leak-proof sheet 102 by the first conveyance unit 54 is changed by the controller 70, and the display element is controlled to return from the state shifted to the plus side (downstream in the conveyance direction). Become.

  As described above, according to the present modification, it is possible to cope with such a problem when only the single-leaf leak-proof sheet 104 is moved and the display element is not moved as much as possible.

  Further, the controller 70 according to the present modification changes the first reference position by the same amount as the change amount of the predetermined position P. Therefore, the degree of change of the predetermined position P can be accurately reflected in the change of the first reference position, and the problem can be dealt with with high accuracy.

  In this modification, the controller 70 changes (shifts) the first reference position based on the change information for changing the predetermined position P, and the display element (black circle) from the changed first reference position is changed. When the first deviation information is acquired (step S9), the first reference position is shifted by an operation on the image (that is, a software operation) as shown in FIG. However, the present invention is not limited to this, and the first reference position may be changed by changing the detection timing detected by the detection member (that is, the shooting timing for shooting by the second camera 74).

  For example, as shown in the left diagram of FIG. 12, the detection timing (imaging timing) may be delayed in order to move the display element further from the first reference position (that is, to shift the first reference position in the minus direction). . Conversely, as shown in the right diagram of FIG. 12, in order to delay the display element from the first reference position (that is, shift the first reference position in the plus direction), the detection timing (imaging timing) may be advanced. . As described above, the first reference position can be shifted by changing the detection timing (photographing timing) instead of the operation on the image (software operation). This is a category.

=== Other Embodiments ===
The above-described embodiments are for facilitating the understanding of the present invention, and are not intended to limit the present invention. The present invention can be modified and improved without departing from the gist thereof, and it goes without saying that the present invention includes equivalents thereof.

  In the said embodiment, although the leak-proof sheet base material 100 and the back sheet base material 110 were mentioned as an example as a sheet | seat which concerns on an absorbent article, it is not limited to this, It is a sheet | seat which concerns on an absorbent article. Anything is acceptable.

  Further, in the above embodiment, the generated single-leaf leak-proof sheet 104 is moved to the joining position C with the back sheet base material 110, and the cut rear end of the single-leaf leak-proof sheet 104 is the back sheet base material 110. Although the anvil roller 62 has been described as an example of the fixing portion that fixes the single-leaf leak-proof sheet 104 to the backsheet base 110 at the joining position C so as to be positioned at a predetermined position, the present invention is not limited thereto.

  For example, a member that moves the generated single-leaf leak-proof sheet 104 to the joining position C with the back sheet base material 110, and a cut rear end of the single-leaf leak-proof sheet 104 is positioned at a predetermined position of the back sheet base material 110. In this manner, the member that fixes the single-leaf leak-proof sheet 104 to the backsheet substrate 110 at the joining position C may be a separate member.

  In addition, the second camera 74 according to the above embodiment photographs (detects) the display element on the single-leaf leak-proof sheet 104 after the cut single-leaf leak-proof sheet 104 is bonded to the back sheet base 110. However, the present invention is not limited to this. For example, the display element on the single-leaf leak-proof sheet 104 before the cut single-leaf leak-proof sheet 104 is bonded to the back sheet base 110 may be photographed (detected).

  In addition, the second camera 74 according to the embodiment captures (detects) a display element on the single-leaf leak-proof sheet 104 immediately after the cut single-leaf leak-proof sheet 104 is bonded to the backsheet base 110. However, the present invention is not limited to this. For example, the display element on the single-leaf leak-proof sheet 104 after the target tape base material is further bonded to the bonded leak-proof sheet base material 100 and the back sheet base material 110 may be photographed (detected). The display element on the single-leaf leak-proof sheet 104 after the other substrates (the absorber 21, the top sheet substrate, the skin side sheet substrate, etc.) are bonded to the substrate on which the three are bonded is photographed ( Detection).

  Moreover, in the said embodiment, a 1st deviation | shift information acquisition part detects the display element provided in the continuous leak-proof sheet | seat 102 by the detection member (1st camera 72), From the 1st reference position of a display element. However, the present invention is not limited to this.

  As described above, when the above-described event occurs, the division unit length of the continuous leak-proof sheet 102 and the pitch of the display elements change, and accordingly, the displacement of the display elements provided in the continuous leak-proof sheet 102 also occurs. It will be. Therefore, the first deviation information from the first reference position of the display element can be obtained by obtaining the division unit length and the pitch of the display element and grasping the variation. And the form which calculates | requires 1st deviation information by such a method, and changes the conveyance speed of the continuous leak-proof sheet | seat 102 based on the calculated | required 1st deviation information is also the category of this invention.

  Further, if the division unit length and the pitch of the display element are obtained and the variation is grasped, it is not necessary to determine how much the display element is deviated from the first reference position. For example, taking an example of the division unit length, obtain whether the division unit length is changing in the positive direction or in the negative direction, and if it is positive, a constant value (a uniform value) is obtained. If the value is subtracted from L2 and is negative, a constant value (a uniform value) may be added to L2. Thus, in view of the object of the invention, it can be said that obtaining a shift and obtaining a division unit length (a pitch of display elements) are equivalent matters. Therefore, in a broad sense, the above-described acquisition of the division unit length (the pitch of the display element) (ascertaining fluctuation) is also included in the category of acquiring the first deviation information from the first reference position of the display element. Therefore, a mode in which the division unit length (the pitch of the display element) is acquired and the conveyance speed of the continuous leak-proof sheet 102 is changed based on the grasped division unit length (the pitch of the display element) is also within the scope of the present invention. It is.

  Moreover, in the said embodiment, the fluctuation | variation information acquisition part (the 2nd camera 74 and the controller 70) obtains the 2nd shift | offset | difference information from the 2nd reference position of the display element provided in the single-leaf leak-proof sheet 104, Although the change information is acquired, the present invention is not limited to this.

  As described above, the length of the single-leaf leak-proof sheet 104 can be obtained (estimated) by acquiring the first deviation information of the display element (including the division unit length (including the pitch of the display element)). Therefore, the variation information acquisition unit varies by obtaining the length of the single leaf leakage prevention sheet 104 from the first displacement information acquired by the first displacement information acquisition unit, instead of obtaining the variation information using the second camera 74. It is good also as acquiring information.

  In the latter case, there is a merit that the second camera 74 can be omitted (the number of parts can be reduced) as compared with the former (that is, in this case, the fluctuation information acquisition unit has the second camera 74). 74 and only the controller 70). On the other hand, in the former case, there is an advantage that fluctuation information can be acquired with higher accuracy than in the latter case.

  Moreover, if 2nd deviation | shift information (1st deviation | shift information) is obtained, it is not necessary to obtain | require the variation | change_quantity of the length of the single-leaf leak-proof sheet 104 based on it. For example, it is acquired whether the second deviation information is changing in the plus direction or in the minus direction, and if it is plus, the predetermined position P is moved to the minus side (upstream in the transport direction) by a certain value (a uniform value). In the case of a minus value, the predetermined position P may be shifted to the plus side (downstream in the transport direction) by a certain value (a uniform value). Thus, in view of the object of the invention, it can be said that acquiring the shift information and acquiring the fluctuation information of the length of the single-leaf leak-proof sheet 104 are equivalent matters. Therefore, in a broad sense, the above-described acquisition of the deviation information is also included in the category of acquisition of the fluctuation information of the length of the single-leaf leak-proof sheet 104. Therefore, a mode in which the second shift information (first shift information) is acquired and the predetermined position P is changed based on the second shift information (first shift information) is also within the scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Diaper 3 Front part, 5 Crotch part, 7 Rear part 14 Flap part, 15 Leg gathers 16 Leg side gathers, 17 End joint part 18 Main body part, 18a Main body joint part 19 Rubber thread 21 Absorber 22 Top sheet, 23 Leakproof sheet , 24 Back sheet 25 Core wrap, 26 Skin side sheet 28 West gather film 29 Target tape 30 Fastening tape, 31 Engagement part, 32 Fixing part 50 Manufacturing apparatus 52 Conveyance unit 54 First conveyance part, 54a First drive roller 54b First Follower roller, 54c Belt 56 Second transport unit 56a Second drive roller, 56b Second follower roller 58 Third transport unit 58a Third drive roller, 58b Third follower roller 61 Cutter roller, 61a Cutter 62 Anvil roller 63 Adhesive application Part 64 Dancer unit 65 Dancer part, 66 Position information acquisition part 70 Controller 72 First camera, 74 Second camera 100 Leakproof sheet base material 102 Continuous leakproof sheet, 104 Single leaf leakproof sheet 110 Back sheet base material C Junction position, E1 tip, G Clearance, P Predetermined position

Claims (7)

A sheet fixing method for fixing a sheet according to an absorbent article,
A cutter unit cuts a continuous sheet provided with display elements repeatedly between the display elements to generate a single sheet,
Moving the generated single-leaf sheet to a merging position with another sheet;
Fixing the single-leaf sheet to the other sheet at the merging position so that a cut rear end of the single-leaf sheet is located at a predetermined position of the other sheet;
Conveying the continuous sheet in the conveying direction toward the cutter unit;
Obtaining deviation information from a reference position of the display element provided in the continuous sheet;
Changing the conveying speed of the continuous sheet based on the deviation information;
Obtaining fluctuation information of the length of the single leaf sheet;
Based on the variation information, controlling the cutter unit and changing the predetermined position;
A sheet fixing method comprising the steps of: The sheet fixing method according to claim 1,
The seat fixing method further comprising changing the reference position based on change information for changing the predetermined position. The sheet fixing method according to claim 2,
When changing the reference position,
The sheet fixing method, wherein the reference position is changed by the same amount as the change amount of the predetermined position. A sheet fixing method according to any one of claims 1 to 3,
Obtaining the deviation information is obtaining first deviation information from a first reference position of the display element provided in the continuous sheet,
When obtaining the fluctuation information,
The sheet fixing method, wherein the variation information is acquired by obtaining second deviation information from a second reference position of the display element provided on the single-leaf sheet. The sheet fixing method according to claim 4,
When obtaining the fluctuation information,
A sheet fixing method, wherein the display element provided on the single-leaf sheet is photographed by a camera, and the second displacement information is obtained based on the photographed display element. A sheet fixing method according to any one of claims 1 to 3,
When obtaining the fluctuation information,
The sheet fixing method, wherein the variation information is obtained by obtaining a length of the single-leaf sheet from the deviation information. A sheet fixing device for fixing a sheet according to an absorbent article,
A cutter unit that cuts a continuous sheet provided with display elements repeatedly between the display elements to generate a single-leaf sheet;
The generated single leaf sheet is moved to a joining position with another sheet, and the single leaf sheet is moved to the other sheet so that a cut rear end of the single leaf sheet is located at a predetermined position of the other sheet. A fixing part to be fixed at the joining position;
A transport unit that transports the continuous sheet in the transport direction toward the cutter unit;
A deviation information acquisition unit for acquiring deviation information from a reference position of the display element provided in the continuous sheet;
A control unit that changes a conveyance speed of the continuous sheet by the conveyance unit based on the deviation information acquired by the deviation information acquisition unit,
A fluctuation information acquisition unit that acquires fluctuation information of the length of the single leaf sheet,
The control unit is configured to control the cutter unit and change the predetermined position based on the variation information acquired by the variation information acquisition unit.

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