JP3560744B2 - Sheet folding device - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a sheet folding device, and more particularly to a sheet folding device for forming a folded portion on one of two sheets that are continuously conveyed in an overlapping manner.
[0002]
[Prior art]
For example, in a production line for a napkin or the like, a sheet folding apparatus for folding and continuously folding two sheets of a surface material and a nonwoven fabric for gathers in the process of transporting the two sheets of the surface material and the nonwoven fabric for gathering is used. Used.
[0003]
This type of sheet folding apparatus includes a trapezoidal main folding guide and an auxiliary guide provided in front of the main folding guide. The nonwoven fabric for gathers is superimposed on the surface material and is continuously conveyed. Then, the inner edge of the nonwoven fabric for gathers is folded back by passing between the auxiliary guide and the main folding guide.
[0004]
[Problems to be solved by the invention]
In the conventional sheet folding apparatus, the guide portion is composed of only the main folding guide and the auxiliary folding guide, and there is no guide that regulates the left and right directions with respect to the sheet conveyance direction. Therefore, if a change in the tension or other disturbance occurs during the conveyance of the sheet, the sheet is displaced, comes off the main folding guide, and the folding becomes impossible. For this reason, the conventional apparatus has a problem that the folding of the sheet is unstable and lacks high-speed stability.
[0005]
Therefore, an object of the present invention is to provide a sheet which can return naturally even when the sheet comes off the guide due to disturbance, and which can stably and surely fold one of the sheets conveyed in an overlapping manner, and which has excellent high-speed stability. To provide a folding device.
[0006]
[Means for Solving the Problems]
The invention according to claim 1 has a main folding guide and an auxiliary folding guide provided in front of the main folding guide, and a pair of second sheets parallel to the width direction are provided on the first sheet. In the sheet folding device, the inner edges of each of the pair of second sheets are folded while passing continuously between the main folding guide and the auxiliary folding guide while being continuously stacked and conveyed. A guide plate made of a thin metal plate is connected to the leading end of the main folding guide on the side where the first sheet and the second sheet are fed, so that the leading end is located at least in front of the position where the auxiliary folding guide is provided. And a pair of pressure-bonding rolls for heat-welding the first sheet and the second sheet so as to sandwich the first sheet and the second sheet. The first sheet is conveyed along the lower surface of the guide plate, and the pair of second sheets is conveyed along the upper surface of the guide plate. The first sheet and the second sheet are heat-sealed by the pressure roll to form a pair of seal portions extending in the sheet conveying direction on the outer sides in the width direction of the guide plate. And the sheet is conveyed integrally to the main folding guide and the auxiliary folding guide, and the first sheet and the second sheet are guided by the guide plate. The object has been achieved by providing a folding device.
[0007]
The invention according to claim 2 provides the sheet folding device according to claim 1, wherein the first sheet is a surface material, and the second sheet is a gather nonwoven fabric. The above object has been achieved.
[0008]
The invention according to claim 3 achieves the above object by providing a sheet folding device according to claim 1 or 2, wherein the guide plate is formed of a thin metal plate integral with the main folding guide. Achieved.
[0009]
According to a fourth aspect of the present invention, an auxiliary guide formed of a roll, a rod, or a plate is provided on a side portion of the main folding guide, and a lower surface of the main folding guide at a connection portion with the guide plate. The above object has been achieved by providing a sheet folding apparatus according to claim 1, wherein the sheet folding apparatus is arranged so as to be flush with the sheet.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of a sheet folding device according to the present invention will be described in detail with reference to the drawings.
In the present embodiment, the sheet folding apparatus according to the present invention is applied to a manufacturing apparatus that manufactures a napkin using a first sheet as a surface material and a second sheet as a nonwoven fabric for gathers.
[0011]
FIG. 1 is a perspective view of a sheet folding device of the present embodiment, FIG. 2 is a side view showing a schematic configuration of the sheet folding device of the present embodiment, FIG. 3 is a cross-sectional view taken along line AA of FIG. FIG. 2 is a sectional view taken along line BB of FIG. 1.
[0012]
As shown in FIG. 1, the sheet folding device according to the present embodiment includes a main folding guide 1 and an auxiliary folding guide 5 provided in front of the main folding guide 1. on wood 15, a pair of second sheets in which a pair of while continuously conveyed by superimposing gather non-woven fabric 14 and 14 nonwoven fabric for a pair of the gathers 14, 14 respective inner edges 14a parallel to the width direction , 14a is passed between the main folding guide 1 and the auxiliary folding guide 5 to fold the sheet. A guide plate 8 made of a thin metal plate such that the leading end of the main folding guide 1 is positioned at least forward of the position where the auxiliary folding guide 5 is provided at the leading end of the main folding guide 1 on the side where the surface material 15 and the gather nonwoven fabric 14 are fed. Are connected to each other, and a pair of pressure-bonding rolls 13, 13 for thermally welding the surface material 15 and the gather nonwoven fabric 14 are arranged vertically so as to sandwich the surface material 15 and the gather nonwoven fabric 14. The surface material 15 is conveyed along the lower surface of the guide plate 8, and the pair of gather nonwoven fabrics 14 are conveyed along the upper surface of the guide plate 8. The non-woven fabric 14 is heat-sealed by the pressure roll 13 to form a pair of seal portions 19 extending in the sheet conveying direction on the outer sides in the width direction of the guide plate 8. Which it is conveyed to the main folding guides 1 and the auxiliary folding guides 5 together, the surface material 15 and gathers the nonwoven fabric for 14 is adapted to be guided by the guide plate 8.
[0013]
The sheet folding device according to the present embodiment will be described in more detail.
1 and 2, the main folding guide 1 serves to fold the inner edges 14a, 14a of the gather nonwoven fabrics 14, 14, and has a flat portion 2 and a desired inclination angle θ from the flat portion 2. The guide portion 3 is bent.
[0014]
The angle of the inclination angle θ is preferably 10 degrees to 60 degrees. If it exceeds 90 degrees, the frictional resistance at the bent portion increases (paper dust or the like is generated). If it is less than 5 degrees, the distance required for folding back becomes longer (space is required). Note that 0 degrees is not possible, and in the present embodiment, the angle of the inclination angle θ is set to 20 degrees.
[0015]
The flat portion 2 has a substantially rectangular planar shape. On the other hand, the guide portion 3 has a substantially trapezoidal shape in which both side edges 3a, 3a are inclined so as to spread rearward, and has a shape having projections 4, 4 projecting to both sides at a rear end portion. . The main folded guide 1 composed of the flat portion 2 and the guide portion 3 having such a shape is arranged so that the flat portion 2 faces the side (upstream side) where the surface material 15 and the nonwoven fabrics 14 for gathers are fed out. ing.
[0016]
In front of the main folding guide 1, a pair of auxiliary folding guides 5 and 5 each having an elongated triangular shape for also folding the inner edges 14a and 14a of the gather nonwoven fabrics 14 and 14 are provided. I have. These auxiliary folding guides 5, 5 are provided at predetermined intervals in the right and left in front of the main folding guides 1, the acute angle portion fraction having a sharp tip toward the opposite sides of the flat portion 2 of the main folding guides 1 Are located.
[0017]
As shown in FIG. 2, the auxiliary folding guides 5, 5 are opposed to each other with a gap 6 between the flat portion 2 and the nonwoven fabric 14 for gathers that allows the nonwoven fabric for gathers 14 to run. The auxiliary folding guides 5 and 5 are attached to a fixed portion of a device (not shown) so as not to hinder sheet conveyance.
[0018]
On both sides of the main folding guide 1, as shown in FIG. 1, the sheet is held on the same plane as the bent portion of the main folding guide 1, thereby stabilizing the tension applied to the sheet at the bent portion of the sheet. Auxiliary guides 7, 7 each of which has a cylindrical roll for stabilizing the turn-back, are provided. That is, the auxiliary guides 7 are provided on both sides of the main folding guide 1 and at positions corresponding to the boundary between the flat portion 2 and the guide portion 3.
[0019]
As shown in FIG. 4, the auxiliary guides 7 and 7 are flush with the lower surface of the main folding guide 1 at a connecting portion where a guide plate 8 described later is connected to the flat portion 2 of the main folding guide 1. It is arranged so that it becomes. The auxiliary guides 7, 7 are made flush with the lower surface of the main folding guide 1 in order to minimize the difference in tension between the material passing through the lower surface of the main folding guide 1 and the material passing through the lower surface of the auxiliary guides 7, 7. It is.
[0020]
In the sheet folding apparatus according to the present embodiment, as shown in FIGS. 1 and 2, the leading end of the main folding guide 1 on the side where the surface material 15 and the gather nonwoven fabric 14 are fed out is formed of a thin metal plate. A pair of guide plates 8 are connected. The guide plates 8 and 8 serve to stably transport the surface material 15 and the nonwoven fabrics 14 for gathers to the main folding guide 1 and the auxiliary folding guides 5 and 5, and have a long plate shape. It is formed as a body.
[0021]
The guide plates 8 and 8 have their base ends connected to the lower surface of the flat portion 2 of the main folding guide 1 by bonding or welding or the like, and the surface material 15 and the nonwoven fabrics 14 for gathers are conveyed. The tip is located toward the upstream side. In the present embodiment, the positions of the distal ends of the guide plates 8 and 8 are located forward of the position at which the surface material 15 is fed out and rearward of the position at which the one nonwoven fabric 14 for gathers is fed.
[0022]
In the sheet folding apparatus, guide rolls 10 and 11 for supplying the gather nonwoven fabrics 14 and 14 to the main folding guide 1 and the auxiliary folding guides 5 and 5 are provided by the guide plates 8 and 8. It is provided on the upper surface side. Further, a guide roll 12 for supplying the surface material 15 to the main folding guide 1 and the auxiliary folding guides 5 and 5 is provided on the lower surface side of the guide plates 8 and 8. Accordingly, the gather nonwoven fabrics 14 supplied by the guide rolls 10 and 11 are supplied from the upper surfaces of the guide plates 8 and 8, while the surface material 15 is supplied from the lower surfaces of the guide plates 8 and 8. You.
[0023]
Further, in the sheet folding apparatus, a pair of pressure rolls 13, 13 for intermittently heat-sealing the gathered nonwoven fabrics 14, 14 and the surface material 15, respectively, are provided. The pressure rolls 13, 13 are provided between the guide roll 12 for supplying the surface material 15 and the auxiliary folding guides 5, 5, and sandwich the surface material 15 and the nonwoven fabrics 14 for gathers in the vertical direction. Are located in
[0024]
The folding of the inner edges 14a, 14a of the gather nonwoven fabrics 14, 14 by the sheet folding device configured as described above is as follows.
As shown in FIG. 3, the nonwoven fabrics 14 for gathers supplied to the folding device are formed by bonding the upper and lower nonwoven fabrics 16 with, for example, a heat-welded portion 17 or the like, inside the overlapping inner edges. This is a configuration in which an elastic material 18 such as rubber is provided.
[0025]
As shown in FIGS. 1 and 2, the gather nonwoven fabric 14 is guided by a guide roll 10 and conveyed along the upper surface of the guide plate 8. It is transported so as to pass between them. Similarly, the other gather non-woven fabric 14 is guided by the guide roll 11 and is also conveyed along the upper surface of the guide plate 8, passes between the main folding guide 1 and the auxiliary folding guides 5 and 5, and Is transported in parallel with the gathered nonwoven fabric 14. On the other hand, as shown in FIG. 2, the surface material 15 is guided by the guide rolls 12 and conveyed along the lower surfaces of the guide plates 8.
[0026]
The aforementioned guide plate 8, 8 interposed therebetween for non-woven fabrics respectively supplied gathered from the vertical direction 14, 14 and the surface member 15, as shown in FIG. 1, is intermittently thermally welded by a pair of crimping rolls 13 formed is sealed by the sealing portion 19 that is, it is transported to the main folding guides 1 and the auxiliary folding guides 5, 5 together.
[0027]
The inner edges 14a, 14a of the gather nonwoven fabrics 14, 14 enter the gap 6 between the auxiliary folding guides 5, 5 and the main folding guide 1, as shown in FIGS. It is folded while passing.
That is, the inner edges 14a, 14a of the gather nonwoven fabrics 14, 14 are first folded outward by the oblique sides 5b, 5b of the auxiliary folding guide 5, as shown in FIG. Then, the folded portion 20 enters the lower surface of the guide portion 3 along the side edges 3a, 3a of the main folding guide 1 while being guided by the auxiliary guides 7, 7, where the folded portion as shown in FIG. The unit 21 is provided.
[0028]
During the above operation, the integrated nonwoven fabrics for gathers 14 and 14 and the surface material 15 (hereinafter, referred to as a sheet body) come off from the main folding guide 1 to the left or right, for example, due to a change in tension on the sheet or other disturbance. However, since the guide plates 8, 8 are connected to the tip of the main folding guide 1, the sheet body immediately returns to its original position immediately.
[0029]
That is, as shown in FIG. 3, since the position of the sheet body is regulated in the vertical and horizontal directions by the pair of guide plates 8 and 8, even if the sheet body is displaced in the horizontal and vertical directions due to disturbance or the like. The guide plates 8 return to the normal position. Therefore, even if there is a disturbance, the inner edges 14a, 14a of the gather nonwoven fabrics 14, 14 can be reliably folded back, and the folding can be performed at a high speed.
[0030]
The sheet body on which the folded portion 21 is formed is continuously wound with a constant tension applied by a winding device (not shown) arranged behind the main folding guide 1.
[0031]
The sheet folding device of the present invention is not limited to the above embodiment, and can be appropriately changed without departing from the gist of the present invention.
For example, in the above-described embodiment, the sheet folding apparatus according to the present invention is described as an apparatus for manufacturing a napkin. However, the apparatus can be used as an apparatus for manufacturing a diaper and the like. In short, the present invention can be applied to a sheet in which two sheets are stacked and conveyed continuously, and the inner edge of one of the sheets is folded back.
[0032]
Further, in the above-described embodiment, the guide plates 8, 8 made of a thin metal plate are connected to the distal end of the main folding guide 1. It may be. In such a case, the number of parts can be reduced and the cost of the apparatus can be reduced.
[0033]
Further, in the above-described embodiment, a cylindrical roll is used as the auxiliary guides 7, but a similar effect can be obtained by using a rod-shaped or plate-shaped guide instead. The point is that, as long as it can guide the folded portion 20, it is not limited to a roll.
[0034]
Further, in the above-described embodiment, the leading ends of the guide plates 8, 8 are positioned to reach the vicinity of the guide roll 11 for guiding one of the gather nonwoven fabrics 14, but at least the positions immediately before entering the auxiliary folding guides 5, 5. The same effect can be obtained.
[0035]
Further, in the above-described embodiment, two guide plates 8, 8 are used, but one wide guide plate may be used.
[0036]
Further, in the above-described embodiment, two sheets are folded at the same time. However, according to the sheet folding apparatus of the present invention, one sheet can be folded similarly.
[0037]
【The invention's effect】
As is clear from the above description, according to the sheet folding apparatus of the present invention, by connecting the thin metal guide plate to the main folding guide, the two superposed sheets are guided by this guide plate. Therefore, even if the sheet tries to come off the main folding guide due to disturbance, it will immediately return to its original position naturally, so that even if there is disturbance, it is possible to form a stable folded part on one sheet, and Because it can be absorbed, high-speed operation is possible and productivity is also improved.
[Brief description of the drawings]
FIG. 1 is a perspective view of a sheet folding device according to an embodiment.
FIG. 2 is a side view illustrating a schematic configuration of a sheet folding apparatus according to the embodiment.
FIG. 3 is a sectional view taken along line AA of FIG. 1;
FIG. 4 is a sectional view taken along line BB of FIG. 1;
[Explanation of symbols]
1 Main Folding Guide 5 Auxiliary Folding Guide 7 Auxiliary Guide 8 Guide Plates 14, 14 Nonwoven Fabric for Gather (Second Sheet)
15 Surface material (first sheet)

Claims (4)

It has a main folding guide and an auxiliary folding guide provided in front of the main folding guide, and superimposes and continuously conveys a pair of second sheets parallel to the width direction on the first sheet. In the sheet folding device, the inner edges of each of the pair of second sheets are folded while passing between the main folding guide and the auxiliary folding guide.
A guide plate made of a thin metal plate is provided at the leading end of the main folding guide on the side where the first sheet and the second sheet are fed out, so that the leading end is located at least in front of the position where the auxiliary folding guide is provided. Connected ,
A pair of pressure rolls for thermally welding the first sheet and the second sheet are arranged vertically so as to sandwich the first sheet and the second sheet,
The first sheet is conveyed along the lower surface of the guide plate, and the pair of second sheets are conveyed along the upper surface of the guide plate.
The first sheet and the second sheet are heat-sealed by the pressure roll, and a pair of seal portions extending in the sheet conveying direction are formed on the outer sides in the width direction of the guide plate, respectively. it is conveyed to the main folding guide and the auxiliary folding guide, the guide sheet folding apparatus characterized by first and second sheets are adapted to be guided by plates. 2. The sheet folding apparatus according to claim 1, wherein the first sheet is a surface material, and the second sheet is a gather nonwoven fabric. 3. The sheet folding device according to claim 1, wherein the guide plate is formed of a metal sheet integrated with the main folding guide. On the side of the main folding guide, an auxiliary guide composed of a roll, a rod or a plate is arranged so as to be flush with the lower surface of the main folding guide at a connection portion with the guide plate. The sheet folding device according to claim 1, 2 or 3, wherein:

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