JP2001178769A - Elastic member mounting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an elastic member mounting device capable of mounting elastic members on a sheet material while displacing and curving two sets of elastic members of a uniaxial type in an corrugated form to cross each other. SOLUTION: This elastic member mounting device comprises one guide shaft 2 provided across a carrier passage for a sheet material A, first and second sliders 3, 4 provided to be oscillated along the guide shaft 2, first and second yarn guide portions 5, 6 provided on the first and second sliders 3, 4 for guiding a plurality of elastic yarns constituting the elastic member onto the sheet material A without being entangled with one another, and slider oscillating means 9 for oscillating the first and second sliders 3, 4 along the guide shaft 2 so that the elastic member can draw a corrugated curve, the first yarn guide portion 5 and the second yarn guide portion 6 being extended to the second slider 4 and to the first slider 3, respectively, so that the first slider 3 and the second slider 4 can cross each other when coming closest to each other.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an elastic member mounting device. In particular, the present invention relates to an elastic member attaching device for attaching an elastic member to a leg hole portion in a disposable disposable diaper.

[0002]

2. Description of the Related Art Conventionally, in a manufacturing process of disposable disposable diapers, a method and an apparatus for attaching an elastic member comprising a plurality of elastic yarns to a leg hole portion are disclosed in, for example, Japanese Patent Application Laid-Open No. 57-117602 and Japanese Patent No.
Various proposals such as those found in Japanese Patent Application Laid-Open Publication No. H10-163, etc. have been proposed.

[0003] In the device disclosed in Japanese Patent Application Laid-Open No. 57-117602, a pair of movable bodies for swinging a rubber cord are provided movably on a uniaxial bearing device, and these movable bodies are swingable on the bearing device. By moving the elastic cord, the elastic cord is adhered while drawing a predetermined curved locus on the sheet material. In the configuration in which the pair of moving bodies are moved on one axis to swing the rubber cord, the moving bodies cannot cross each other, so that the rubber cords cross each other on the sheet material. There was a problem that it could not be done.

To solve such a problem, there is an invention described in Japanese Patent No. 2532824. In the present invention, two traverse means for displacing and bending the rubber cord are prepared so that the rubber cords can cross each other, and these traverse means are separated and arranged in parallel in the moving direction of the sheet material (web). . That is, it has a plurality of first yarn guide holding portions, and moves forward and backward so as to intersect with the moving direction on a substantially half area in the width direction of a substantially central area of the moving continuous web. A first traverse means for displacing and bending the first elastic member made of each elastic yarn held in each of the continuous webs at a constant period so as to draw a sine curve in a direction intersecting the moving direction on the continuous web; A plurality of second yarn guide holding portions are arranged in parallel with the first traverse means in the moving direction, and are arranged so as to intersect the moving direction on the remaining substantially half area of the substantially central area. And the second elastic member made of the elastic yarns held by each of the second yarn guide holding portions is displaced along a sine curve of the first elastic member in a direction intersecting the moving direction on the continuous web. Curved and continuous In the width direction of the E blanking is obtained is composed of a second traverse means for displacing the curved at a fixed cycle so as to draw a sine curve-shaped curve that face each other.

[0005]

As described above, when two moving bodies are arranged on one axis, the moving bodies close each other's course, so that the two elastic members are displaced and curved so as to cross each other. However, if the two elastic members are to be displaced and curved so that they can cross each other, the two traversing means must be separated and arranged in the moving direction of the sheet material as described above. In addition to the extra space required for separation and juxtaposition, the traverse means is required to have higher mounting accuracy than the uniaxial type, and as a result, assembly and maintenance of the apparatus are complicated.

Further, in order to accurately displace and curve the elastic member on the sheet material at a higher speed, in order to avoid the influence of the bending of the elastic member, the elastic member in the moving body is moved from the contact point where the elastic member contacts the sheet material. It is desirable to minimize the distance to the derivation point. However, since the elastic member is usually led out to the place where the front and back sheet materials are superimposed by the press roll, in the latter device, when the traversing means is approached to the contact point, each Since the traversing means are arranged in parallel with each other along the moving direction of the sheet material, the traversing means interferes with the press roll, and as a result, the traversing means cannot be brought closer to the contact point. Therefore, there is a problem that there is a limit to speeding up.

SUMMARY OF THE INVENTION The present invention has been made in order to solve such a problem, and it is possible to displace and curve two elastic members in a wavy line so as to be able to cross each other while being a uniaxial type. An object of the present invention is to provide an elastic member mounting device that can accurately displace and curve a member on a sheet material at high speed.

[0008]

In order to achieve the above object, an elastic member attaching apparatus according to the present invention comprises two sets of elastic members on a belt-like sheet material conveyed in a longitudinal direction. A device for mounting in a wavy line so that peaks and valleys alternately appear along the direction and each other's peaks and valleys intersect or face each other on the sheet material,
A uniaxial guide shaft provided on the conveyance path of the sheet material so as to intersect with the conveyance path, a first slider and a second slider provided on the guide shaft so as to swing along the guide shaft; A slider, a first thread lead-out portion provided on the first slider, for leading a plurality of elastic threads constituting the elastic member onto the sheet material without entanglement with each other, and a first thread lead-out portion provided on the second slider. A second thread lead-out portion for leading a plurality of elastic threads constituting the elastic member onto the sheet material without entanglement with each other; the first slider and the second slider; Slider swing means for swinging along the guide shaft so as to draw a curved line, wherein the first yarn lead-out portion is on the second slider side, and the second yarn lead-out portion is the first slider. On the side, the said As the slider and the second slider may cross upon closest approach is obtained by extending, respectively.

According to the present invention, the first slider and the second slider
The slider oscillates on one axis, and the first and second sliders extend so that the first yarn lead-out portion and the second yarn lead-out portion can intersect when the first slider and the second slider come closest. Since it is provided out, it is also possible to cross two sets of elastic members with each other while being a uniaxial type, so that two sets of elastic members can be mounted on a sheet material in a desired wavy line shape. it can.

At the same time, the first and second sliders are made much closer to the contact point where the elastic member comes into contact with the sheet material because the device is extremely compact as compared with the conventional device having two traverse means. it can.

In the above invention, the slider swing means is provided along one end of the guide shaft and along the guide shaft, and the driving force of the cam mechanism is controlled by the first slider and the first slider. A first drive shaft and a second drive shaft for transmitting to the two sliders, respectively, one of the first drive shaft and the second drive shaft being a cylindrical body, and the other being a cylindrical body along the axial direction thereof. The rod may be slidably inserted.

According to this, the drive system appearing around the guide shaft is substantially only the first and second drive shafts, so that the drive system can be more compactly assembled.

Further, in the above invention, the slider swinging means includes a pair of motors capable of rotating forward and backward, a first drive belt and a second drive belt for transmitting the driving force of each motor to the first slider and the second slider, respectively. And a drive belt.

According to this, it is possible to swing the two sets of elastic members at high speed, and it is possible to promote mass production of the disposable diaper.

Further, in the above invention, the slider swing means is a linear motor, wherein an outer rail serving as a stator of the linear motor is used as the guide shaft, and a movable element of the linear motor is used as the first slider and the second slider, respectively. It may be configured to be attached to a slider.

According to this, since no driving system appears around the guide shaft, it is possible to further compact the device, and it is possible to swing the two sets of elastic members at a high speed. Can promote.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a bottom view showing a part of the elastic member attaching device 1 according to the present invention in a cutaway view, FIG. 2 is a front view of the elastic member attaching device 1 according to the present invention, and FIG. FIG. 2 is a schematic diagram showing an arrangement position of the device 1.

The elastic member mounting apparatus 1 according to the present invention includes two sets of elastic members X on a strip-shaped sheet material A conveyed in the longitudinal direction along the feeding direction of the sheet material A, with peaks and valleys, respectively. Appear alternately and the peaks and valleys of each other are sheet material A.
A device for mounting in a wavy line shape so as to intersect or oppose in the widthwise central region of the sheet material, in the vicinity of a press roll E that presses a sheet material A and a cover sheet D that overlaps with the sheet material A It is arranged in.
The elastic member mounting device 1 includes a guide shaft 2, a first slider 3 and a second slider 3 provided on the guide shaft 2.
The slider 4, the first thread lead-out portion 5 provided on the first slider 3, the second thread lead-out portion 6 provided on the second slider 4, and the first slider 3 and the second slider 4 are swung. The main part is constituted by the slider swinging means 9 to be moved. Hereinafter, each of the above components will be sequentially described.

The guide shaft 2 swingably supports the first slider 3 and the second slider 4. The guide shaft 2 is a uniaxial shaft provided on the conveyance path of the sheet material A so as to intersect with the conveyance path.
In the present embodiment, it is composed of a pair of parallel rails 2a and 2b. However, the form of the guide shaft 2 is not limited to the above, and for example, a guide groove may be provided on one rail.

The first slider 3 and the second slider 4 swing on the guide shaft 2 to cause the elastic member X to oscillate in the above-mentioned wavy line. The first slider 3 and the second slider 4 are provided at the center of the guide shaft 2 and on the same plane as the rails 2a and 2b. In this embodiment, both ends of the first slider 3 and the second slider 4 are the rails 2 of the guide shaft 2.
a, 2b.

When the elastic member X is displaced and bent in the wavy line shape, the plurality of elastic yarns constituting the elastic member X do not become entangled with each other. As described above (see FIG. 4). The first yarn lead-out portion 5 has a base end provided on the upper part of the first slider 3, a leading end 5 a extending toward the second slider 4, and a plurality of elastic yarns extending from the leading end 5 a. Is derived. In addition, the base end of the second yarn lead-out section 6 is provided above the second slider 4,
The tip portion 6a extends to the first slider 3 side,
A plurality of elastic yarns are led out from the tip 6a. The leading end 5a of the first yarn leading section 5 is the first
The second yarn lead-out portion 6 extends obliquely upward from the base end provided on the slider 3 toward the second slider 4.
The distal end portion 6a extends obliquely upward from the base end portion provided on the second slider 4 toward the first slider 3 side. Therefore, the leading ends 5a and 6a of the first yarn lead-out section 5 and the second yarn lead-out section 6 are connected to the first slider 3 and the second slider 4 respectively.
Can cross each other when they approach each other. Further, the extension lengths of the distal end portions 5a and 6a of the first and second yarn lead-out portions 5, 6 so that the elastic members X derived from the first and second yarn lead-out portions 5, 6 do not become entangled with each other. There is a difference. Further, a plurality of threading holes (not shown) are provided at regular intervals in the distal end portions 5a, 6a of the first thread leading section 5 and the second thread leading section 6, and these thread passing holes 1 are provided. One elastic thread penetrates each piece.

In the present embodiment, the first yarn lead-out section 5
Although both the first and second yarn lead-out portions 6 are provided in the same direction, the first and second yarn lead-out portions 5 and 6 may be provided in opposite directions. In the case where the elastic members X are provided in the opposite directions, the derived elastic members X do not become entangled with each other.
It is not necessary to provide a difference in the extension length between a and 6a.

When the elastic member X is led out onto the sheet material A, the contact points where the elastic member X comes into contact with the sheet material A are moved from the contact points of the first and second yarn lead-out parts 5, 6 to the tips 5a, 6a.
It is preferable that the distance to the orbit through which a passes is set to be within 30 mm in view of speeding up. This distance is 3
By setting the thickness within 0 mm, the influence of the deflection of the elastic member X can be eliminated, and the elastic member X can be moved at a higher speed by the sheet material A.
It can be attached while being accurately displaced and curved.

The slider swinging means 9 swings the first slider 3 and the second slider 4 along the guide shaft 2 so that the elastic member X can draw a wavy curved line. In the present embodiment, the slider swing means 9 includes a first drive shaft 7, a second drive shaft 8, and a cam mechanism 90. The cam mechanism 90 includes a cylindrical cam 91, a first
Slider block 93 and second slider block 94
And a guide rail 95.

The first drive shaft 7 is for transmitting the driving force of the slider swing means 9 to the first slider 3. The first drive shaft 7 is formed of a cylindrical body. One end 7 a of the first drive shaft 7 is attached to the first slider 3, and the other end 7 b is attached to the first slider block 93. The second drive shaft 8 is for transmitting the driving force of the slider swing means 9 to the second slider 4. The second drive shaft 8 is formed of a rod, and is slidably inserted along the axis of the first drive shaft 7. One end 8a of the second drive shaft 8 is attached to the second slider 4, and the other end 8b is attached to the second slider block 94. These first drive shaft 7 and second drive shaft 8
The guide shaft 2 is provided between a pair of rails 2a and 2b.

The cylindrical cam 91 is connected to the first slider block 9.
This is for sliding the third and second slider blocks 94. The cylindrical cam 91 is provided so that its peripheral wall surface is located parallel to the guide rail 95 with a slight gap therebetween, and is rotated by a motor (not shown) via a belt and a pulley 92 (not shown). ing. On the peripheral wall of the cylindrical cam 91, a pair of ridges 91a and 91b which are displaced and curved so as to correspond to the swing pattern of the first and second sliders 3 and 4 are formed.

The first slider block 93 has a cylindrical cam 9
By sliding on the guide rail 95 following the fluctuation of the first ridges 91a and 91b, the driving force of the motor
This is for transmitting to the drive shaft 7. Further, the second slider block 94 is provided with the ridges 91 a and 91 of the cylindrical cam 91.
The drive force of the motor is transmitted to the second drive shaft 8 by sliding on the guide rail 95 following the fluctuation of b. The first slider block 93 and the second slider block 94 are formed with cam followers 930 and 940 that match with the ridges 91 a and 91 b formed on the peripheral wall of the cylindrical cam 91.

As described above, the guide rail 95 is
The slider block 93 and the second slider block 94 are slidably supported. The guide rail 95 is provided on an extension of the guide shaft 2.

Next, the operation of the elastic member mounting device 1 having the above configuration will be described with reference to FIG. In FIG. 5, only one sheet material A is illustrated for convenience of describing the displacement and bending of the elastic members X, X on the sheet material, a cover sheet D that is superimposed with the sheet material A, and a press that superimposes both sheets. Roll E is not shown.

Here, the elastic members X, X
Are bonded at the most distant positions from each other, and from this position, the elastic members X, X are displaced and curved toward the central region of the sheet material A and approach to each other. A case will be described in which, after intersecting in a region, displacement bending is performed again in a direction away from each other.

First, as shown in FIG. 5A, the first slider 3 and the second slider 4 are located at the most distant positions on the guide shaft 2, and at this time, the first and second slider blocks 93, 94 is the closest position. Therefore, in the cylindrical cam 91, the portion where the interval between the protruding strips 91a and 91b is the smallest is located at a position corresponding to the first and second slider blocks 93 and 94.

Here, the motor (not shown) is started, and the cylindrical cam 9 is turned on.
As shown in FIG. 5 (b), the interval between the ridges 91a and 91b on the cylindrical cam 91 increases with the rotation of the cylinder 1 as shown in FIG. Following this, the first slider block 93
And the second slider block 94 moves away along the guide rail 95. The first and second slider blocks 9
The operation of the third and fourth sliders 94 is transmitted to the first and second sliders 3 and 4 via the first and second drive shafts 7 and 8, and the first and second sliders 3 and 4 approach each other. With this movement, the elastic members X, X move closer to the central region of the sheet material A while being displaced and curved.

Further, when the cylindrical cam 91 rotates, FIG.
As shown in FIG.
The interval of 1b eventually becomes maximum, and the first and second sliders 3 and 4 come closest together with this. At this time, the first yarn lead-out portion 5 and the second yarn lead-out portion 6 intersect, and the elastic members X, X also intersect on the sheet material A following this.

When the cylindrical cam 91 continues to rotate, the first
And second slider blocks 93, 94 and first and second slider blocks 93, 94.
The sliders 3 and 4 operate in the opposite direction to the above, that is, FIG.
(B), the operations shown in the order of FIG.
Along with this, the elastic members X, X are respectively displaced and curved toward both side edges of the sheet material A.

Thereafter, the above-described operation is repeated, whereby the elastic members X, X are led out onto the sheet material A in a predetermined waveform line.

The swing pattern of the first slider 3 and the second slider 4 can be freely changed by changing the displacement pattern of the ridge of the cylindrical cam 91. Therefore, the elastic members X, X are not limited to a corrugated line composed entirely of curves, but are preferably derived even if they are, for example, a square line or a line in which a straight line and a curve are mixed.

Further, the slider swing means 9 is not limited to the means using the cylindrical cam 91 described above.

Next, a second embodiment will be described with reference to FIG.

In the present embodiment, a pair of motors (not shown) that can be rotated forward and backward as the slider swing means 9 and the driving force of each of these motors is transmitted to the first slider 3 and the second slider 4, respectively. A first drive belt B1 and a second drive belt B2.

As the motor, a pair of servo motors capable of rotating forward and backward is used. For example, an AC servo motor or a DC servo motor may be used.

First drive belt B1 and second drive belt B
Numeral 2 is for transmitting the driving force of the motor to the first slider 3 and the second slider 4 via the pulley C.
The first drive belt B1 and the second drive belt B2 are wound around the respective pulleys C. Further, through holes 30 and 4 are provided at the center portions of the first slider 3 and the second slider 4.
0 are formed, and the first drive belt B1 and the second drive belt B2 are inserted through the through holes 30 and 40, respectively. Further, the first drive belt B1 is fixed to the inner wall 31 of the through hole 30 of the first slider 3, and the second drive belt B2 is fixed to the inner wall 41 of the through hole 40 of the second slider 4. The first and second drive belts B
The positions at which the first and second sliders 1 and 2 are fixed to the first and second sliders 3 and 4 are not limited to those described above.
The outer surfaces of the sliders 3 and 4 may be used.
And the inner walls 3 of the through holes 30 and 40 of the second sliders 3 and 4
It is preferable to fix the first and second sliders 3 and 4 to the first and second sliders 4, since the first and second sliders 3 and 4 can be driven most smoothly. Note that the first and second sliders 3, 4 can be formed without forming the through holes 30, 40 in the first and second sliders 3, 4.
, A protrusion may be provided on the back of the first drive belt B1, and the protrusion may be fixed to the first and second drive belts B1 and B2.

Next, the operation of the slider swing means 9 of the second embodiment will be described. The operation other than the slider swinging means 9 is the same as that of the first embodiment.

When the motor is rotated forward and backward at a predetermined timing, the first drive belt B1 and the second drive belt B2 respectively move in the forward and reverse directions following the operation of the motor. As a result, the first slider 3 and the second slider 4 are fixed to the first drive belt B1 and the second drive belt B2, and follow the movement of the first drive belt B1 and the second drive belt B2. To move on the guide shaft 2.

Next, a third embodiment will be described.

In the present embodiment, the slider swing means 9 in the first embodiment is constituted by a linear motor, and the outer rail 20 serving as a stator of the linear motor is provided.
Is the guide shaft 2, and the mover 300 of the linear motor is attached to the first slider 3 and the second slider 4, respectively. That is, as shown in FIG. 7, the outer rail 2 corresponding to the guide shaft 2 is provided.
0 indicates two outer rails 20a and 20
b are connected in series so as to be uniaxial, and a power supply board (not shown) for supplying power to the coil of the mover 300 is attached at an appropriate position on each inner wall surface. Each of the outer rails 20a and 20b has a mover 30 attached thereto.
0 is slidably fitted one by one, and each mover 300 is fixed to the back surface of each slider 3, 4. The configuration of the first yarn lead-out unit 5 and the second yarn lead-out unit 6 is the same as in the above-described embodiments. In this configuration, by changing the polarity of the voltage applied to the power supply board of each outer rail 20a, 20b at a high speed, each mover 300 reciprocates in the outer rails 20a, 20b, whereby each slider 3, 4 The elastic members X and X are repeatedly adhered on the sheet material A in a wavy line by repeating the operation of moving closer to and away from each other, that is, the same operation as described with reference to FIG.

[0046]

As described above, since the present invention is constituted, the following effects are exhibited.

That is, the elastic member attaching device according to the present invention comprises:
The first slider and the second slider oscillate on the same guide shaft, that is, on one axis, and the first and second sliders include a first thread lead-out portion and a second thread lead-out portion, respectively. Is extended so that it can intersect when it comes closest, so it is possible to intersect two sets of elastic members with each other even though it is a uniaxial type, and two sets on the sheet material Can be attached in a desired wavy line shape. Therefore, Patent No. 25328
Unlike the invention described in Japanese Patent Publication No. 24, no extra installation space is required. In addition, the present invention relates to Patent No. 2
No high mounting accuracy required for the traverse means in the invention described in Japanese Patent No. 532824 is required, and assembly and maintenance of the device are easy.

Further, a slider swing means is provided along one end of the guide shaft along a cam mechanism and the guide shaft, and the driving force of the cam mechanism is applied to the first slider and the second slider. It is provided with a first drive shaft and a second drive shaft for transmitting respectively, and one of the first drive shaft and the second drive shaft is slid in the cylinder and the other is slid in the cylinder along the axial direction. When the rod is inserted as much as possible, the drive system appearing around the guide shaft is substantially only the first and second drive shafts, so that the drive system can be more compactly assembled.

Further, a pair of motors capable of rotating the slider swinging means in forward and reverse directions and the driving force of each of the motors is controlled by the first motor.
When the first drive belt and the second drive belt transmitting to the slider and the second slider, respectively, are provided, it is possible to swing the two sets of elastic members at high speed, thereby promoting mass production of disposable diapers. I can do it.

The slider swing means is a linear motor, wherein the outer rail of the linear motor is the guide shaft, and the mover of the linear motor is attached to the first slider and the second slider, respectively. In this case, the drive system does not appear around the guide shaft at all, so that it can be further compacted and the two sets of elastic members can be swung at a high speed, which can promote mass production of disposable diapers.

[Brief description of the drawings]

FIG. 1 is a bottom view showing a part of an elastic member mounting device of the present invention in a cutaway manner.

FIG. 2 is a side view of the elastic member mounting device of the present invention in FIG.

FIG. 3 is a schematic view showing an arrangement position of an elastic member attaching device of the present invention.

FIG. 4 is a perspective view showing a yarn lead-out portion according to the embodiment of the present invention.

FIG. 5 is a view for explaining the operation of the elastic member attaching device of the present invention.

FIG. 6 is a schematic view showing a slider swinging unit according to a second embodiment of the present invention.

FIG. 7 is a schematic diagram showing a slider swinging unit according to a third embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Elastic member mounting device 2 Guide shaft 3 1st slider 4 2nd slider 5 1st thread lead-out part 6 2nd thread lead-out part 7 1st drive shaft 8 2nd drive shaft 9 Slider rocking means 90 Cam mechanism 91 Cylindrical cam 93 First slider block 94 Second slider block 95 Guide rail X Elastic member A Sheet material B1 First drive belt B2 Second drive belt C Pulley D Cover sheet E Press roll 20 Outer rail 300 Mover

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[Procedure amendment]

[Submission date] December 28, 1999 (1999.12.
28)

[Procedure amendment 1]

[Document name to be amended] Drawing

[Correction target item name] All figures

[Correction method] Change

[Correction contents]

FIG.

FIG. 2

FIG. 3

FIG. 4

FIG. 6

FIG. 7

FIG. 5

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Ikuo Tachibana 15-21 Minamibeppu-cho, Settsu-shi, Osaka Zumikonai F-term (reference) 3B029 BF07 4C098 AA09 CC12

Claims (4)

[Claims] 1. Two sets of elastic members are formed on a strip-shaped sheet material conveyed in a longitudinal direction so that peaks and valleys alternately appear along a feeding direction of the sheet material, and peaks and valleys of each other are formed. Is a device for attaching in a wavy line so as to intersect or oppose on the sheet material, and a single-axis guide shaft provided on the conveyance route of the sheet material so as to intersect with the conveyance route; A first slider and a second slider provided on a guide shaft so as to be swingable along the guide shaft, and a plurality of elastic yarns provided on the first slider and constituting the elastic member are entangled with each other. A first thread lead-out portion for leading out onto the sheet material without being provided; and a second thread leading-out portion provided on the second slider and leading out onto the sheet material without entanglement of a plurality of elastic yarns constituting the elastic member. 2 yarn lead-out section And a slider swing means for swinging the first slider and the second slider along the guide shaft so that the elastic member can draw the wavy curve. Are extended to the second slider side, and the second yarn lead-out portion is extended to the first slider side so that the first slider and the second slider can intersect when approached closest. Elastic member mounting device. 2. The slider swinging means includes: a cam mechanism provided at one end of the guide shaft; and a cam mechanism provided along the guide shaft, the driving force of the cam mechanism being applied to the first slider and the second slider. And a first drive shaft and a second drive shaft that respectively transmit the first drive shaft and the second drive shaft. One of the first drive shaft and the second drive shaft is a cylindrical body, and the other slides into the cylindrical body along the axial direction thereof. The elastic member attaching device according to claim 1, wherein the elastic member attaching device is a rod that is inserted so as to be capable of being inserted. 3. The slider swing means includes: a pair of motors rotatable in forward and reverse directions; and a first drive belt and a second drive belt for transmitting a driving force of each motor to the first slider and the second slider, respectively. The elastic member attaching device according to claim 1, further comprising: 4. The slider swing means comprises a linear motor, an outer rail serving as a stator of the linear motor serves as the guide shaft, and a mover of the linear motor serves as the first slider and the second slider, respectively. The elastic member attaching device according to claim 1, wherein the elastic member attaching device is attached to the elastic member.