JP2584446B2 - Elastic strip fixing device for fixing stretched elastic strips to a sheet driven to move continuously, and diaper manufacturing apparatus - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to an apparatus for fastening stretch elastic strips to a sheet, as well as an apparatus for making a composite board to provide a diaper.

(Prior Art) A diaper in which an impermeable material sheet such as polyethylene and an impermeable sheet made of, for example, a nonwoven material are adhered to each other with a wadding made of an absorbent material interposed at equal intervals between these sheets. Today, they are continuously produced by machines on an industrial scale.

The composite sheet thus formed is then cut transversely between absorbent waddings, with each piece of the composite sheet thus cut being intended to form a diaper.

During this production, it is known to bond two elastic bands extending longitudinally on the composite sheet at each lateral end of the latter between the two sheets, respectively. These elastic bands are adapted to adhere when stretched between flatly arranged sheets so that when they are relaxed, pleats or wrinkles are formed at the lateral edges of the diaper.

However, adhering a stretch of elastic strip transversely between two flatly arranged sheets to a diaper product with elastic tape at each of their longitudinal ends presents a production problem.

In fact, the task of adhering the stretched pieces to the sheet at regular intervals such that the strips extend in a direction transverse to the direction of movement of the sheet is such that the strips are conveyed regularly and these Stretching and positioning on the sheet such that it is stretched and stretched transversely to the direction of movement of the sheet while being bonded is a difficult task.

Problems to be solved by the invention It is therefore an object of the present invention to achieve a high bonding speed of the strip while simultaneously working reliably and efficiently with a device for bonding the stretch elastic strip to the sheet. It is to provide what is possible.

SUMMARY OF THE INVENTION Therefore, the subject of the present invention is a device for stretching a stretch elastic strip to a continuously driven sheet, means for stretching the strip into a frame portion and stretching the strip. And a means for laying and tightening the stretched strip on the sheet in the area of the support surface where the sheet is seated. The feeding means is synchronized with the stretching means, but the stretching means itself is also synchronized with the driving means for moving the sheet.

Other features include: the stretching means is a first transverse to the direction of movement of the sheet;
It is mounted so that it can rotate around the axis of

The stretching means comprises means for holding each lateral end of the strip and means for moving each of these holding means relative to each other parallel to the first axis.

The means of movement are of the cam type;

The holding means are of the gripping type associated with the laying down fastening means and the supply means;

Each means for holding the lateral ends of the strip comprises at least one gripping device for retaining the lateral ends of the strip, said devices being circumferentially distributed around the first axis; Sorted at the same radial distance from the axis. Each gripping device of each holding means is arranged at the same angular position about the first axis as the corresponding associated gripping device of the opposite holding means for holding the opposite lateral end of the strip.

Each gripper comprises a gripper extending parallel to the first axis, the active end of which is oriented in the direction of the opposite associated gripper;

-Each gripper has an active position in which each gripper can grip the corresponding lateral end of the band between its active end and its corresponding support, and this active end of the gripper is disengaged from the support. Pivotally mounted on each support about an axis perpendicular to the first axis between the release positions. The actuating means comprises means for placing the gripper in the active position and means for releasing it.

The gripper support is slidably mounted parallel to the first axis.

-There are two axially spaced flanges on the shaft, which are wedged with respect to rotation on the shaft. The shaft extends according to a first axis, and the respective gripper support of the holding means is carried by respective flanges and is slidably mounted between the flanges.

-Each gripper support is associated with a respective connecting rod, which articulates at its respective end around an axis parallel to each other on the one hand on the corresponding support and on the other on the adjacent flange. ing.

The moving means consist of two cams integral with the frame and axially spaced from each other between the two flanges; Each of these cams extends circumferentially about the first axis and the connecting rods carried by the same flange are each provided with a single roller that interacts with the corresponding cam to slide each gripper support. Is controlled.

The means for placing each gripper in the active position are each constituted by a resilient member arranged between the gripper and its corresponding support, pressing the active end of the gripper in the direction of each support;

Each gripper carries a roller and the release means consists of two pairs of cams integral with the frame, each pair being in communication with the gripper carried by the same flange. Each pair of cams comprises a first cam located near the laying and tightening means and a second cam located near the supply means.

The subject of the present invention relates to an apparatus for producing a composite sheet for simultaneously forming a diaper. The composite sheet is joined to each other, with two sheets spaced apart from each other such that the elastic strip is glued across and stretched onto the flatly disposed composite sheet; And a wadding of absorbent material disposed between two adjacent strips.

The apparatus includes a machine for clamping the stretch elastic strip transversely to the first sheet, means for placing an absorbent wad between two adjacent strips on the first sheet, and a means for placing the second sheet on the first sheet.
Means for clamping against the sheets, such that the strip and the wadding extend between the two sheets.

A feature of the present apparatus is that the machine for clamping the stretch elastic strip to the first sheet in the transverse direction is configured as described above.

〔Example〕

(Explanation of Synthetic Sheet) The synthetic sheet N shown in FIGS. 1 and 2 is made of a flexible and impermeable material, for example, a polyethylene film, and forms a first surface of the synthetic sheet, For example, the second sheet 2 is made of a flexible impermeable material such as a nonwoven material and forms the other surface of the synthetic sheet.

These two sheets 1 and 2 are joined to each other, and the wadding 3 of the absorbent material, the elastic band 4 and the elastic band piece 5 are inserted between the two sheets 1 and 2 and between them. Glued.

Each elastic band 4 extends along a corresponding longitudinal edge of the composite sheet so that it stretches when the composite sheet is flat and forms pleats or wrinkles that extend longitudinally when the composite sheet relaxes. Glued. The elastic strips 5 extend transversely in the synthetic sheet at regular intervals from one another between the longitudinal elastic strips 4. These elastic strips 5 are similarly adhered so as to form pleats or wrinkles extending when the composite sheet is flat and transverse when the composite sheet is relaxed.

Absorbent waddings 3, for example made of shredded wood pulp, each extend longitudinally between two adjacent elastic strips,
It extends transversely between the two longitudinal elastic bands 4.

The elastic material used for the elastic band 4 and the elastic strip 5 can be any type of material currently used in the art, but comprises an open-cell foam such as a polyfretan foam. Desirably, it is an elastic material.

This synthetic material, as described above, has a transverse line C (FIG. 2).
Can be formed when cut along. This transverse line C is located approximately in the center of the strip so that a diaper can be formed between the two cutting lines C.

(Description of Apparatus) In the diaper formed as described above, the longitudinal elastic band 4 is designed to extend around the thigh of the wearer so that the diaper is sealed in the vicinity of the diaper.
The elastic strip 5 bonded in the transverse direction is further positioned around the waist of the wearer so that the diaper is sealed.

The apparatus for producing a composite sheet N shown in FIGS. 3 and 4 comprises a stretching station 7 for assembling a stretched elastic strip 5.
1 includes a machine 6 for laterally bonding to the first sheet 1.

The elastic strip 5 is supplied from a roller 8 of an elastic strip 9 (FIG. 4).

The apparatus also comprises a station 10 for producing cotton wool 3 from seeds 11 of absorbent material which have been cut at regular intervals by well-known cutting means 12 of the rotary knife type. Filler 3 is station 10 and assembly station 7
Is conveyed by the conveyor 13, and the conveyor 13
Each wadding is deposited on the sheet 1 between the elastic strips 5 that have been previously bonded. The nonwoven sheet 2 is conveyed to the assembling station 7 from a supply means 14 comprising two rollers 15 which are successively unwound.

The impermeable sheet 1 is conveyed to the assembly station 7 from a supply means 16 consisting of two rollers 17 which are likewise rolled up one after the other.

The assembled synthetic sheet N is conveyed from the assembly station 7 to a cutting station (not shown). The diaper is formed by passing through a device for pressurizing the synthetic sheet N in advance. The pressing device comprises two endless belts (not shown), between which the synthetic sheet is pressed.

Similarly, two strips 4 of elastic material are also conveyed to the assembly station 7 and are respectively glued to one side along the corresponding longitudinal edge of the first sheet 1.

Overview of the Machine of the Invention The machine 6 is a drawing station which is adjacent to the assembly station 7 in a partially shown frame B in the upstream direction and stretches the elastic strips 5 before they are laid on the first sheet. E is provided with means D (FIG. 5) for supplying an elastic strip 5 designed to carry these strips.

These supply means D further comprise a roller 8 which unwinds the elastic band 9 downstream and a tension station F which is pulled before the elastic band 9 coming from the roller 8 enters the adhesive coating station C. However, at the station, the entirety of one of the two surfaces of the elastic band is covered with glue, except for two areas respectively located near one lateral end of the elastic band.

Coaching station G is followed by relaxation station H, where elastic band 9 is relaxed and sent to cutting station I, where the elastic band is cut transversely at regular intervals throughout its length. The elastic strip 5 is transported from the cutting station I to the stretching station E and distributed to the transport station J which supplies the elastic strip 5.

The roller 8 is rotatably mounted around a horizontal axis, and the strand of the elastic band 9 coming from this roller rises, passes over the first guide roller 25, descends again, rises again, and passes over the second guide roller 26. Then, a loop 27 is formed between these two guide rollers 25 and 26. A tension roller 28 is arranged at the bottom of the loop 27 to reliably pull the elastic band 9. This tension roller 28 can be operated solely by its own weight or can be associated with a tension spring (not shown).

After passing over the second guide roller 26, the elastic band 9 retains the direction of movement of the elastic band 9 with the first deflection roller 29 (FIG. 4).
Passes over a second deflecting roller 30, which deflects the direction of movement of the elastic band at right angles.

This arrangement using a second deflecting roller 30 has the advantage that by arranging the roller 8 on one side of the latter it is possible to limit the space occupied by the length of the machine.

The elastic band pulled by the roller 28 is
Third guide roller oriented by the deflecting roller 30
31, passes through the lower portion, rises again in the inclining direction, and moves on the fourth guide roller 32.
Pass between 1,32. The nozzle 33 applies an adhesive to the upper surface of the elastic band 9.

When it leaves the fourth guide roller 32, the glued elastic band 9 descends again and immediately rises to the cutting station 1. Therefore, elastic band relaxation station H
Is provided by a loop 34 between the cutting station and the fourth guide roller 32, the presence of which ensures that the elastic band 9 relaxes near this. The cutting station I comprises an anvil 35 mounted rotatably about an axis parallel to each other and a device constituting a cutting device 36. The elastic band 9 passes between the cutting device 36 and the device forming the anvil 35 in order to be cut laterally into the strip 5.

The elastic strip 9 is then moved by a finger 37 (FIG. 5, FIG. 10) carried by a drum 38 mounted rotatably about an axis parallel to the axis of rotation of the device forming the anvil 35.
(See FIG. 1). These fingers 37 interact with the glue-coated surface of the elastic strip 5 and the rotation of the drum 38 and the adhesive-coated surface of the elastic strip 5, and these strips 5 are in pairs. Is transported to a stretching station E whose lateral end is gripped by the gripper 39 of FIG. These grippers 39 are rotatably mounted about an axis parallel to the axis of rotation of the drum 38 of the transport station J, and the elastic strip 5 is stretched parallel to this axis and the first at the assembly station 7.
It will be placed on the sheets 1 and glued.

The assembling station 7 is adjacent to the drawing station E and has a gripper 39 rotatably mounted thereon. It comprises a drum 40 movably mounted for rotation about an axis parallel thereto.

If the rotation direction of the drum 40 is considered, the composite plate N is assembled on the circumference of the drum 40 in the following procedure.

First, the first sheet 1 is disposed on the cylindrical surface of the drum 40 that moves with it, and the elastic strip 5 extends in the transverse direction to the direction of its movement and adheres to the first sheet at a uniform distance from each other. The longitudinal elastic strips 4 to which the adhesive has been applied by the nozzles 41 as described above are applied to the respective lateral ends of the first sheet 1, and a series of nozzles 42 apply the elastic strands to the elastic strips. 5, the elastic band 4 and the first sheet 1 deposited on itself, the conveyor 13 deposits the absorbent wadding 3 between the elastic bands 5 near the upper part of the drum 40, and then the wadding 3 And the entire composition is adhered to form a composite sheet N as it passes between the drum 40 and the pinch roller 43.

The stretched strip 5 has two lay-down clamping rollers 44 (FIGS. 3, 7; 7) extending between this first sheet supported by the drum 40 and the gripper 39 of the drawing station E.
(FIGS. 8, 9, and 10), and is arranged on the first sheet 1 and tightened. The cylindrical surface portion of the drum 40 to which the rollers 44 are placed on the sheets for placement on the elastic strip 5 thus forms a support surface during which the elastic strip 5 is adhered to the first sheet 1.

A means for supplying the absorbent wadding 3, a means for supplying the second nonwoven sheet 2, a means for supplying the first sheet 1 of the impermeable film, a means E for extending the elastic strip 5, and the latter. Needless to say, the means for laying and tightening is synchronized with the working speed of the assembly station 7, that is, the rotational speed of the drum 40 that drives the sheet 1 to its forward movement.

(Explanation of Synchronizing Means) Drum 40 driven to rotate by the device (not shown) itself
Has a mechanically variable transmission consisting of two pulleys connected to each other by a chain (FIG. 5), each of which has a flange which is axially movable without slipping, as in the prior art. The gripper 39 is driven to rotate. The first pulley 45 is integral with the drum 40 in rotation and the axial position of the movable flange of this pulley relative to the associated fixed flange is adjusted by a jack or a conventional mechanical actuator. The second pulley 46 is integral with the gripper 39 with respect to rotation, and the movable flange of this pulley 46 is pressed by an elastic member toward the adjacent fixed flange.

The inner surfaces of the flanges of these pulleys are
It has radial ribs that interact with lateral fingers protruding from the chain 47 connecting the six. With this configuration, the stretching station E for the elastic strip 5 is provided with pulleys 45 and 46.
Variably synchronized with the assembly station 7 in spite of the change in the winding diameter of each of the chains 47. In this way, the working speed ratio of these two stations changes, so that the spacing between the elastic strips 5 adhered to the first sheet 1 can be adjusted, so that diapers of different lengths can be adjusted. Can be created.

The fourth guide roller 32 is driven to rotate by a motor 48 controlled by a transmission 49. This transmission 49 is, on the one hand, as a function of the rotational speed of the device forming the anvil 35 of the cutting station I by means of a speed sensor 50, for example of mechanical or electronic type, connected to the transmission 49, and, on the other hand, also The speed of the fourth guide roller 32 is controlled as a function of the bottom position of the loop 34 of the station H, which relaxes the elastic band 9 by means of a position sensor 51, for example of mechanical or electronic type, connected to the machine 49 (FIG. 5). .

This configuration allows the fourth guide roller 32 to be synchronized with the cutting station I, while allowing the loop 34 to be constantly present in the relaxation station H.

The roller 8 of the elastic band 9 is unwound by an endless belt 52 driven by a motor 53 controlled by a transmission 54. This transmission 54 is, for example, a transmission
As a function of the rotational speed of the fourth guide roller 32 by a mechanical or electronic type speed sensor 55 connected to 54, the other hand, for example, by a mechanical or electronic type position sensor 56 connected to the transmission 54, Tension loop
Adjust the speed of motor 53 as a function of the bottom position of 27.

The unwinding speed of the roller 8 for this configuration can be synchronized with the driving speed of the fourth guide roller 32, and by controlling the position of the bottom of the loop 27, the elastic band 9 can be reliably secured upstream of the guide roller. It becomes possible to pull accurately.

In the adhesive coating station G, the nozzle
33 is connected by a pump P (FIG. 5) to a tank 57 for storing a high-temperature adhesive held in a molten state by an electric resistor 58. The flow of the adhesive dispensed by the pump P is regulated on the one hand as a function of the required thickness of the adhesive on the elastic band and on the other hand as a function of the speed of movement of the latter.

The gripper 39 of the drawing station E is integral with the cog wheel 59 (FIG. 6) for rotation. This cogwheel 59
Is connected to the second cog wheel 60 by a chain 61 of which one strand is pulled by a tension pinion 62. The cog wheel 60 is itself integral with a pinion 63 which meshes with a second pinion 64 which meshes with a third pinion 65.

The second pinion 64 is rotationally integral with a third cogwheel 68 which is connected by a chain 67 to a fourth cogwheel 68 integral with the drum supporting the finger 37 of the transfer station J in rotation.

The third pinion 65 is connected to the cutting station I with respect to rotation.
A fifth cogwheel 69 connected by a chain 70 to a sixth cogwheel 71 that is rotationally integral with the device forming the anvil 35 of FIG.

The rotational speed of the device forming the anvil of the cutting station I is thus synchronized with the speed of the drum 38 of the transfer station J, and the rotational speed of the drum 38 itself is synchronized with the speed of the gripper 39 of the drawing station E. .

It should be noted that the rotation direction of the drum 40 of the assembly station 7 is the same as that of the drum 38 of the transfer station J. Similarly, the gripper 39 of the drawing station E
Is the same as that of the device forming the anvil 35 of station I and opposite to that of the drum 40 of the assembly station 7. (See arrow R in FIG. 5) (Detailed Description of the Machine Assembly Station and Laying Tightening Means of the Present Invention) The drum 40 of the assembly station 7 is, as shown in FIG. It is mounted horizontally so that it can rotate freely. The pinch roller 43 is likewise constructed so that its cylindrical surface substantially abuts that of the drum 40 so that the elements of the composite sheet N are sandwiched between the roller 43 and the drum and assembled together by gluing. It is rotatably mounted between the pillars about an axis parallel to that of the drum 40.

The force with which the pinch roller 43 is pressed against the drum 40 can be adjusted by two jacks 72 (FIGS. 7 and 8).

Rollers 44 for laying the stretched elastic strips 5 on the first sheet 1 supported by the drum 40 are each rotatably mounted around the same axis parallel to the rotation axis of the drum 40. The rollers 44 are carried near one end of the arm 73 and are arranged on both sides of this arm. The arm 73 has a roller at its end facing the roller 44 about an axis parallel to the axis of rotation of the latter towards the lower part of the frame to which it is joined.
It extends perpendicular to 44.

These rollers 44 are pressed on the arm 73 at one of their ends and against the first sheet 1 supported on the drum 40 stop by a jack 74 joined to the frame B at the opposite end. The jack 74 thus makes it possible to adjust the force with which the stretched strip 5 of the elastic band is sandwiched between the first sheet and these laying rollers 44 so as to be adhered to this sheet. .

As shown in detail in FIG. 9, the corresponding ends of the shaft 73 each extend in opposite directions along the same axis.
Takes the tailshaft of the book. Each of the rollers 44 is rotatably mounted on one of these tail shafts 75 and, as a function of the length of the strip 5 elongated at its axial end opposite the arm, in other words, the strip 5 It can receive at least one annular member 76 designed to increase the axial length of the corresponding roller 44 as a function of the width of the elastic band 9 to be created.

Further referring to FIG. 8, the cylindrical surface of the drum 40 is provided with a cover 77 made of a material having a low coefficient of friction and a low coefficient of adhesion, for example, silicone rubber, so that the first sheet 1 Laying roller 44 and gripping roller 43 against the resilience exerted by adhesive strip 5 which is stretched on one sheet and tends to retract laterally.
It will be noted that it stays prolonged between and. The first sheet 1 is thus completely held flat by friction on the cover 77 of the drum 40 so that it receives the longitudinal elastic band 4 and becomes completely flat as it passes under the gripping rollers 43.

Stretching station Stretching station E is the drum 38 of transfer station J
And a shaft 78 rotatably mounted about an axis parallel to the axis of rotation of the drum 40 of the assembly station 7, the shafts 78 being axially spaced and perpendicular to the axis of rotation. It bears two flanges 79 that are wedged against rotation extending in the plane of the plane.

In this embodiment, each flange 79 has five grippers extending parallel to shaft 78 in opposite flange directions.
39, the active end of the gripper carried by one flange oriented in the opposite flange direction. Each of the grippers carried by the flange 79 is disposed by the opposite flange 79 in the same angular position with respect to the corresponding gripper 39 and shaft 78 which are carried together. The stretching station E thus comprises five pairs of grippers arranged at equal angular intervals around the shaft 78, each gripper of which holds the corresponding lateral end of the elastic strip 5. Has become.

Each gripper is joined about an axis perpendicular to the axis of rotation of the shaft 78 on the support 80.

These supports 80, which are arranged at equal angular intervals around the shaft 78, pass through respective flanges 79 and slide in two blocks 82 fixed to the outer surface of the flanges 79, respectively. 81 slidably mounts between the two flanges 79 respectively.

Each gripper 39 has a width close to the width of the elastic strip 5 and is joined on a corresponding support and stored in a fork provided in this support, the grippers 39 radiating outside the flange 79. Are arranged.

The helical spring 83 is provided at one of its ends at the bottom of the fork provided in each support 80 and at its opposite end the corresponding gripper between the latter joint axis on the support and its active end. Fixed to Each spring 83 extends and operates to return the respective gripper 39 to its active position, i.e., the position in which the active end of this gripper comes into contact with the corresponding support, and between the latter support and this active end. Grips the lateral end of the elastic strip 5.

Referring to FIG. 24, the active ends of the grippers 39 extend along the width of the grippers, thereby forming a kind of nose that grips the lateral ends of the elastic strip 5 against the support 80. I think it will be.

In order to control the action of the support 80 sliding parallel to the axis of the shaft 78, the support is in each case connected to a connecting rod 85 which, on the one hand, on the corresponding support 80, On the other hand, on the flange 79 carrying this support, it is joined at each of its ends around axes parallel to one another. Each connecting rod 85 carries a roller 86 movably mounted for rotation about a radial axis parallel to the joint axis at the end of each connecting rod 85.

Rollers 86 in contact with connecting rods 85 carried by the flanges 79 are connected to the frame 8 through which the shaft 78 passes.
Interacts with a cam 87 in the form of a circumferential groove made in the outer periphery of the corresponding end of the freeb 88 wedged above.

Thus, the sleeve 88 forms a cam at each end thereof which substantially limits the range of the sine period relative to the circumference of the sleeve. These cams 87 are symmetrical with respect to a plane perpendicular to the rotation axis of the shaft 78.

The cam 87 causes the gripper of each pair of grippers 39 arranged at the same angular position with respect to the shaft 78 as a result of the sliding of the support material 80 to provide a slightly smaller space between them than that of the strip 5. The grippers of this pair of grippers grip each lateral end of the elastic strip 5 provided by the transport station J against the corresponding support 80 by being close to each other when in the vicinity of the transport station J to be formed. It has such an external shape.

Furthermore, the outer shape of these cams 87 allows the two grippers 39 of the same pair of grippers to pivot with each other during the rotation of this pair of grippers in a rectangular gap arranged between the transfer station J and the assembly station 7. The elastic strips 5 are gripped by each of their lateral ends at the transport station J by moving them away from each other.
It is shaped to stretch out. When the pair of grippers is near the assembly station 7 opposite the first sheet 1 supported on the drum 40, the grippers of the pair of grippers are separated from each other as much as possible, so that the laying roller 44 causes the gripper and the support 80 And extend between them.

Further, the cylindrical shell defined by the support member 80 around the shaft 78 contacts the cylindrical shell defined by the fingers 37 around the rotation axis of the drum 38 of the transfer station, and forms the strip 5 transferred by the fingers 37. The lateral ends are adapted to enter substantially in contact with a support 80 at the top of which they will be gripped by the corresponding gripper 39. Similarly, the cylindrical shell, which is limited around the shaft 78 by the gripper in the active position, is
The strip 5 of the elastic band is substantially held in contact with the cylindrical shell defined by the shaft and the shaft 78 and the shaft 78 are gripped between the laying roller 44 and the first sheet while these grippers 39 rotate.

Between their actuated position and the retracted position, i.e. their active ends stand against the corresponding supports 80 against the force exerted by each spring 83, and the springs 83 support their active ends. Actuation of the grippers between the positions of movement away from the material is performed by the cam drive in synchronization with their axial displacement.

Thus, each gripper 39 has at its end opposite the corresponding active end a roller 89 rotatably mounted about an axis perpendicular to the articulation axis of the corresponding gripper on each support 80. I have.

The rollers 89 carried by the grippers 39 in communication with the same flange 79 are each designed to interact with two respective cams integral with the frame B. (FIG. 10, FIG. 11, FIG. 12) Thus, the two first cams 90 are respectively provided on the corresponding sides of the frame near the transfer station J, and similarly, the second cam 91 is Each is provided on a corresponding side of the frame near the assembly station 7.

The first and second cams 90, 91 each have a curved shape and are intended to direct the gripper 39 to the release position when the roller 89 rises against the cams 90 or 91.

The angular position of the cams 90 around the shaft 78 and the angular spacing they extend around the shaft 78 is such that the grippers of each pair of grippers release when they grip the strip 5 there against the transport station J. In position,
It is as if it were in the active position before reaching the opposite side of the transfer station and when leaving it.

This feature is illustrated in FIG. 12, which illustrates how the rollers 89 of the gripper 39, shown in solid release position, interact with the cam 90. This same gripper is such that the roller 89 no longer interacts with the cam 90 and the corresponding lateral end of the elastic strip 5 is supported by the active end of the gripper with the corresponding support 80
Is indicated by the dash-dotted line at its active position which is gripped with respect to.

The angular position around the shaft 78 and the angular spacing at which the second cam 91 extends around the shaft is defined by the gripper 39.
Are stretched elastic strips 5 which they grip at their lateral ends
Is brought to the release position when gripped between the laying roller 44 and the first sheet 1 supported by the drum 40, and is in the active position before the elastic strip 5 is placed on the sheets, It is such that these elastic strips 5 will return to this active position after they have been placed on the seat.

Transfer station Drum 38 of transfer station J is cutting station 1
This drum 38 almost in contact with the device 35 for forming an anvil
There are several pairs of radial fingers 37 defining a cylindrical shell around the axis of rotation.

Fingers 37 of the same pair of fingers are axially spaced from one another on a drum 38, each of which is a pair of fingers relative to the stretching station E and to the device forming the anvil 35 of the cutting station I. Of the elastic strip 5 faces the glued surface of the strip 5 between the two non-adhered portions 5a (FIG. 10) of the elastic strip 5, and the paired fingers are the Providing the strip 5 to a pair of grippers 39 of the drawing station E to grip the unbonded transverse end 5A of the corresponding elastic strip 5 against each of the grippers 39 and their respective supports 80. The axis position is as follows.

In other words, two fingers of the same pair
The axial spacing between 37 is smaller than that between the two grippers 39 of the same pair when the grippers are in close proximity to each other opposite the transport station J.

Cutting Station The cutting station 1 shown in FIGS. 13 and 14 includes a device for forming an anvil 35 located below the cutting station 36 between two columns of the frame B.

The device forming the anvil 35 comprises a shaft 92 and a bell 92 formed integrally with the shaft 93 for rotation and pivoting in the frame B. The bell 92 is mounted on its outer cylindrical surface with an outer surface of these anvil members 94 incorporated in an axially extending bell 92 so as to ensure continuity of the outer cylindrical surface of the bell 92 with an equal angular interval in the cylindrical direction. An anvil 94 in the form of a bar to be processed is provided at a distance from one another.

The cylindrical wall of the bell 92 also has an anvil 94 and a pipe 96
And holes (not shown) distributed over the entire wall between the aspirator (not shown) and an intake nozzle 95 arranged inside the bell 92. Pipe 96 passes through the open face of the bell.

The intake nozzle 95 extends in the bell in the axial direction around the cylindrical inner surface of the bell and extends in a cylindrical direction near a part of the cylindrical wall of the bell 92 in a fan-like shape, substantially in the direction of the cutting device 36, i.e. 13 and 14, the elastic band 9 and the elastic band 5 formed by cutting the elastic band in the transverse direction are held on the outer cylindrical surface of the bell 92 by suction.

The cutting device 36 is a shaft 93 for forming the anvil 35
The shaft 97 is rotatably mounted in the frame B in parallel with the shaft 93, and is stored in the same vertical plane as the shaft 93.

The shaft 97 bears three radially arranged knives 98 arranged at equal angular intervals in a cylindrical shape, the cutting edges of these knives extending in the axial direction. The cylindrical shell defined around the shaft 97 by these knives 98 substantially touches the outer cylindrical surface of the bell 92, and as a result of the shafts 93 and 97 rotating in opposite directions to each other, air is sucked onto the outer cylindrical surface of the bell 92. The retained elastic strips 9 are cut one after the other by a knife 98 near the anvil material 94, and the strips 5 themselves are retained by suction on the outer cylindrical surface of the bell 92, and finally they are the fingers 37 of the transfer station J. To be grasped.

The shaft 93 is engaged with the shaft 97 of the cutting device and the pinion 100 which is integral with the rotation.
(See FIG. 1), the latter is driven to rotate in the opposite direction to the shaft 93, and is simultaneously synchronized with the latter.

A lever 101 joined on a shaft 93 carries a nozzle 95 at one of its ends inside a bell 92 and a shaft 95 at the opposite end.
By changing the angular position of the lever 101 around 93, the nozzle 95
Extends inside the slot 102 outside of the frame B so as to be wedged between two adjustment nuts 103 which allow the angular position of the nut to be changed.

Since the surfaces of the elastic strips 9 oriented in the direction of the knives 98 are those previously coated with glue, these knives 98 are liable to be stained by glue during cutting of the elastic strips 9. For this reason,
The cylindrical brush 104 is placed on the shaft 97 and stored in the same vertical plane as the shaft so that the glue is removed by rubbing against the brush 104 while they rotate.

To maintain the efficiency of the brush 104 during operation, a tank 105 of a suitable cleaning liquid, for example paraffin, is placed on the frame above the brush 104, the bottom of which is connected to a sprinkler rack 106 located on the brush 104 Then, the cleaning liquid stored in the tank 105 is dropped and spread thereon.

During the operation, the elastic band 9 unwound from the roller 8 is pulled longitudinally by the tension roller 8 and then coated on the upper surface with an adhesive at an adhesive coating station G. Is not coated with an adhesive.

After passing over the guide roller 32, the elastic band 9
After relaxation in the immediate vicinity, it will be retained on the outer cylindrical surface of the bell 92 by inhalation, where it will be cut laterally by a wall 98 and retained on this bell 92 by inhalation.

At the moment when the elastic strip 5 has left the suction zone of the nozzle 95, the pair of fingers 37 of the transfer station J are moved.
Is subsequently gripped.

Upon reaching the opposite side of the stretching station E, each elastic strip 5 carried by a pair of fingers 37 is tangentially associated with a pair of grippers 37, which are brought to a release position by a cam 90. , Immediately return to the active position,
After retreating from these cams, the elastic strip 5 grips the side end of the elastic strip 5 which is not coated with the adhesive.

While the shaft 78 rotates, the strips 5 previously gripped by the gripper 39 at the transfer station J are stretched one after another. Because the grippers of each pair of grippers retreat axially from each other, the latter is separated as much as possible when the elastic strip 5 engages between the laying roller 44 and the first sheet 1 driven to move with the drum 40. Because they do. When engaged between the laying roller 44 and the first sheet 1, the gripper 39 releases the elastic strip 5 and comes into a released position to interact with the cam 91 and maintain the stretched state as a result of the pressure applied by the roller 44. These elastic strips 5 are bonded to the first sheet 1 extending in a direction transverse to the direction of movement of the latter.

This first sheet 1 with transversely bonded and uniformly spaced stretched elastic strips 5 will then receive a longitudinal elastic strip 4. Thereafter, the absorbent wadding 3 arranged between the elastic strips 5 and, finally, the various non-woven sheets covering the various elastic members and the absorbent wadding, which were previously bonded, form a synthetic sheet N, The diaper is obtained by being cut in the lateral direction at equal intervals at substantially the center of each strip 5.

Alternative Embodiment In the alternative embodiment of the drawing station depicted in FIG. 15, the gripping device holding the shaft 78 and the strip carries two cylindrical blocks 200 on which the latter is slidably mounted. As they are replaced by shafts which are wedged against rotation by ribs 201 slidable along them.

Each block is provided with a groove 202 extending circumferentially on the outer periphery of the block 200 corresponding to the vicinity of its end facing the adjacent block.

Each groove limits the sine period along the circumference of each block,
Interacts with the corresponding roller 203 integral with the frame.

The groove 202 is substantially symmetrical about a plane perpendicular to the axis of the shaft 278 and forms a cam for controlling the movement of the block sliding on the shaft 278 in both directions during the latter rotation.

Each block 200 has an area 204 of its cylindrical surface with a hole 205 near its end adjacent to the other block.

These two regions 204 have the same angular position with respect to the shaft 278 and each are angled on the perimeter of the corresponding block over a length at most equal to the width of the elastic strip 5 for the reasons described below. Extend.

These perforated areas 204 are each connected to an aspirator (not shown) by a corresponding pipe 206 that opens into each bush 207 rotatably mounted in a circumferential notch adjacent to the area 204 of the corresponding block 200. Communicating.

The internal configuration of the blocks 200 and their communicating bushes 207 are such that the partial vacuum supplied by each pipe 206 is transmitted to the perforations 205 in the corresponding area 204.
It is formed between each of the 207 and the corresponding block 200.

These two pipes 20 are fixed so that the pipes 206 can be fixed to the block 200 and guided when they slide axially over the shaft 278.
6 passes between two bars 208 parallel to a shaft 278 integral with the frame. Rollers 203 are connected to these bars and are rotatably mounted about an axis perpendicular to the axis of rotation of shaft 278.

The cylindrical shell defined by these blocks 200 is substantially in contact with that defined by the fingers 37 of the transfer station J and that defined by the drum 40 of the assembly station 7.

In this alternative, the intake air near the regions 204 is synchronized with the operation of the transport and assembly station and the movement of the blocks 200 moving axially closer together and away from these regions.
When the block 204 is on the opposite side of the pair of fingers 37 carrying the strip 5, the blocks 200 are in close proximity to each other and the air strip is repelled over each of the regions 204 by inhaling air through the perforations 205. 5 are held.

As the shaft 278 rotates from the transport station to the assembly station, the two blocks 200 move away from each other under the action of rollers 203 interacting in the cam groove 202 to stretch the strip 5 carried by these blocks 200. Exercise.

At the stage when the stretched strip is gripped between the first sheet and the laying roller 44, the suction is shut off and the strip is released, and the block 200 continues to rotate to the transport station close to each other, and a pair of fingers 37 Figure out the new strips offered there.

Combined with this alternative, the finger of transfer station J
The drum 38 with 37 can be replaced by a conveyor belt which receives strips from the cutting station and deposits them synchronously on the perforated area of the block 200.

Of course, many other alternatives are possible without departing from the scope of the invention. Therefore, instead of depositing on the elastic strip 9, glue is applied to the downstream elastic strip 5
It can be deposited on itself or on the first sheet 1 close to the part of its surface to which the elastic strip 5 is glued.

Furthermore, it can be seen that the number of knives 98, fingers 37 and grippers 39 is not limited to a particular value, but is essential in that the various stations of the machine of the invention are synchronized with each other. Hazuki.

[Brief description of the drawings]

FIG. 1 is a linear plan view of a synthetic sheet for providing diapers produced by the apparatus of the present invention. FIG. 2 is a longitudinal sectional view of the composite sheet as shown in FIG. 1, and FIG. 3 is a partial diagram of the apparatus of the present invention for manufacturing the composite sheet as shown in FIGS. 1 and 2. With the machine according to the invention for bonding the stretch elastic strip to the continuously moving sheet, FIG. 4 shows the means for feeding the elastic band to the machine according to the invention contained in the apparatus according to FIG. FIG. 5 is a partial diagrammatic view, FIG. 5 is an enlarged schematic basic diagram of the machine of the present invention included in the apparatus of FIGS. 3 and 4, and FIG. 6 is a device for driving and synchronizing a transfer station and the machine of the present invention. FIG. 7 is an enlarged linear side view of the composite sheet assembly station of the apparatus of FIG. 3, and FIG. 8 is a partial view along line 8-8 of FIG. FIG. 9 is an enlarged partial sectional view taken along line 9-9 in FIG. 7, and FIG. 10 is a top view of the machine of the present invention. FIG. 11 is a partial plan view of the assembling, laying, stretching, transporting and cutting stations of the machine in a plan view, FIG. 11 is an enlarged linear sectional view taken along line 11-11 in FIG. 10, and FIG. Is an enlarged detailed view of a portion of FIG. 10 depicting the strip passing from the transport station to the stretching station, FIG. 13 is a partial cross-sectional view taken along line 13-13 of FIG. 14, FIG. 14 is an enlarged linear side view of the cutting station of the machine of FIG. 3, FIG. 15 is a linear perspective view depicting an alternative embodiment of the stretching means, N... Composite sheet, 1. 2 sheets, 3 ... cotton filling 4 ... elastic band 5, 5 ... elastic band 7 ... assembly station, 6 ... machine 13 ... conveyor, 17 ... roller 16 ... supply means G ... coaching station F …… Tension station J …… Transport station, 27 …… Loop 25,26 …… Guide row , 31, 32 ...... first, second roller E ...... stretching station, I ...... cutting station

Claims (24)

(57) [Claims] 1. A frame, an elastic strip supplying device for supplying an elastic strip on the frame, a stretching device for receiving the elastic strip and extending the elastic strip, and an adhesive applied to the elastic strip. While leaving the uncoated portion, the elastic strip is coated with an adhesive, an adhesive applying device, stretched by the stretching device, and coated with the adhesive applied from the adhesive applying device, When the sheet passes over the support surface, the elastic strip is placed and fixed on the sheet, an elastic strip mounting and fixing device, synchronized with the movement of the sheet, and the elastic strip An elastic strip fixing device for fixing a stretched elastic strip to a sheet driven to move continuously, comprising a synchronizing device for synchronizing a strip feeding device with the stretching device. . 2. The elastic strip fixing device according to claim 1, wherein the stretching device is rotatably mounted around a first axis transverse to a moving direction of the sheet. Said elastic strip fixing device. 3. The elastic strip fixing device according to claim 2, wherein the stretching device holds a lateral end of the elastic strip, and the lateral end is formed of an adhesive. The elastic strip fixing device, comprising: an end holding device that is not covered; and a moving device that moves the end holding device relative to each other in parallel with the first axis. 4. An elastic strip fixing device according to claim 3, wherein said moving device is a cam type device. 5. The elastic strip fixing device according to claim 4, wherein the end holding device has a gripper interlocked with a driving device, and the driving device is configured to control the elastic strip feeding device and the elastic strip feeding device. The elastic strip fixing device synchronized with the elastic strip mounting / fixing device. 6. The elastic strip fixing device according to claim 5, wherein the end holding layers respectively hold the corresponding lateral ends of the elastic strip that are not covered with the adhesive. A plurality of gripper devices, the plurality of gripper devices being arranged around the first axis, and each of the gripper devices having the same distance and the same angle in the radial direction from the first axis. Wherein the gripper devices of each of the end holding devices are respectively the same as the corresponding interlocking device of the opposite end holding device so as to hold the opposite lateral end of the elastic strip. Arranged at an angle,
The elastic strip fixing device. 7. The elastic strip fixing device according to claim 5, wherein each of the grippers extends parallel to the first axis, and a working end of the gripper is connected to the opposite side of the gripper. The elastic strip fixing device arranged in a gripper direction. 8. The elastic strip fixing device according to claim 7, wherein each of the grippers is located between an operation position and a release position and around an axis perpendicular to the first axis. Rotatably mounted such that, in the operating position, the gripper is configured to be able to grip a corresponding lateral end of the elastic strip between its operating end and a corresponding support device; The resilient band, wherein the operating end of the gripper is configured to move away from the support device in a position, and the driving device has a moving device for moving the gripper to the operating position and a releasing device for releasing the gripper One-side fixing device. 9. The elastic strip fixing device according to claim 8, wherein said gripper has a supporting device slidably mounted parallel to said first axis. . 10. The elastic strip fixing device according to claim 9, further comprising two flanges spaced apart from each other in an axial direction on a certain axis, wherein said flange is provided on said axis. Wedge with respect to rotation, said shaft being said first
The resilient band extending coaxially with the support of the gripper of each end holding device being carried by a corresponding flange and slidably mounted between the two flanges; One-side fixing device. 11. The elastic strip fixing device according to claim 10, wherein the supporting device of each gripper is linked to a corresponding connecting rod, and both ends of the connecting rod are arranged around axes parallel to each other. Indirectly connected to both ends of the connecting rod are connected to a corresponding support device and one of the flanges,
The elastic strip fixing device. 12. The elastic strip fixing device according to claim 11, wherein the moving device is integrated with a frame and is axially spaced from each other between the two flanges. The elastic strip fixing device, comprising two cams, each cam extending around the first axis. 13. The elastic strip fixing device according to claim 12, wherein the connecting rod carried by each flange has a roller cooperating with a corresponding grooved cam, wherein each roller is Rotatably mounted about a radial axis with respect to the first axis, wherein the radial axis is parallel to the indirect axis of the corresponding connecting rod on the flange and on the corresponding support device. The elastic strip fixing device. 14. The elastic strip fixing device according to claim 13, wherein the cam is formed in a sleeve through which the shaft passes, and the sleeve is wedge-fastened to the frame. Strip fixing device. 15. The elastic strip fixing device according to claim 14, wherein the moving device for moving each of the grippers to the operating position includes the supporting device corresponding to the operating end of the gripper. The elastic strip fixing device, further comprising an elastic member disposed between the gripper and the corresponding supporting device so as to press in the direction of. 16. The elastic strip fixing device according to claim 15, wherein said releasing device has two pairs of cams integrated with said frame, and said gripper is provided with said two pairs of cams. Each of the pair of cams is supported by the corresponding flange of the corresponding cam pair, and each of the pair of cams includes a first cam disposed near the elastic strip supplying device and a second cam disposed near the elastic strip fixing device. The elastic strip fixing device having two cams, wherein each gripper carries a roller so as to cooperate with the corresponding first cam and second cam. 17. The elastic strip fixing device according to claim 2, wherein the elastic strip device / fixing device is rotatably supported by an arm integrated with the frame, and the roller is Extending parallel to the first axis between the respective end holding devices for holding a corresponding lateral end of the elastic strip so as to rest on the sheet at a support surface. And the elastic strip fixing device. 18. The elastic strip fixing device according to claim 17, wherein the elastic strip mounting / fixing device has two rollers rotatably mounted on both sides of the arm, respectively. The elastic strip fixing device. 19. The apparatus according to claim 18, wherein each roller is configured to receive at least one annular member that increases the axial length of the roller. The elastic strip fixing device. 20. The elastic strip fixing device according to claim 2, wherein the elastic strip supply device further includes a transport device synchronized with the stretching device and the elastic strip supply device. The elastic strip fixing device, wherein the conveying device conveys the elastic strip from the elastic strip supply device to the stretching device. 21. The elastic strip fixing device according to claim 20, wherein the transport device has a drum rotatably mounted around a second axis parallel to the first axis, At least one pair of fingers is carried on the outer peripheral surface of the drum, and the at least one pair of fingers is disposed at intervals in the axial direction and substantially in the radial direction, and each pair of the fingers is the elastic strip. The elastic strip fixing device, wherein the elastic strip fixing device is configured to be adhered to a surface coated with the adhesive. 22. The elastic strip fixing device according to claim 2, further comprising a cylindrical member forming an anvil, wherein the sheet is configured to pass over the cylindrical member. The elastic strip fixing device. 23. The elastic strip fixing device according to claim 2, wherein said end holding device is a suction type holding device. 24. The elastic strip fixing device according to claim 22, wherein said cylindrical member is a bell having a perforated hole disposed on a cylindrical surface thereof, and said end holding device is provided with: Having a suction nozzle mounted to the frame, disposed within the bell, and disposed proximate at least a portion of the inner cylindrical surface of the bell.
The elastic strip fixing device.