JPS63219602A - Machine for tightening extensible elastic strip piece to continuously moving sheet and diaper manufacturing apparatus - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an apparatus for fastening stretched elastic strips to sheets, as well as an apparatus for producing composite boards for providing diapers.

(Prior Art) A diaper is made of a sheet of an impermeable material such as polyethylene and an impermeable sheet made of a non-woven material, which are adhered to each other with padding made of an absorbent material interposed at equal intervals between the sheets. Today, they are produced continuously by machines on an industrial scale.

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

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

However, adhering a stretched piece of elastic band transversely between two flatly arranged sheets to a diaper product with an elastic tape at each of their longitudinal ends poses production problems.

In fact, the process of gluing stretched strips to a sheet at regular intervals so that these strips extend transversely to the direction of movement of the sheet is such that the strips are conveyed regularly and Although it is stretched and arranged on the sheet so that it is glued and stretched transversely to the direction of movement of the sheet, it is a difficult task.

PROBLEM SOLVED BY THE INVENTION It is therefore an object of the invention to provide an apparatus for gluing stretched elastic strips to sheets that ensures efficient work while at the same time achieving high gluing speeds of the strips. Our aim is to provide what is possible.

SUMMARY OF THE INVENTION The subject of the present invention is therefore a device for tightening a stretched elastic strip to a continuously driven sheet with means for stretching the strip onto a frame part. An object of the present invention is to provide a device having the features of a strip supplying means for conveying the stretched strip on the sheet and a means for laying and tightening the stretched strip on the sheet in the support surface area where the sheet is placed. The feeding means are synchronized with the stretching means, which are themselves synchronized with the drive means for moving the sheet.

Among other features: - the stretching means are mounted for rotational movement about a first axis transverse to the direction of movement of the sheet;

- the stretching means consist of means for holding each transverse end of the strip and means for moving these respective holding means relative to each other parallel to the first axis;

- The means of movement is of the cam type.

- the holding means are of the gripping type associated with the laying and clamping means and the feeding means;

- each means for holding the lateral ends of the strip each comprises at least one gripping device for holding the lateral ends of the strip;
These devices are distributed circumferentially around a first axis and are spaced at the same radial distance from this 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 opposite lateral ends of the strip.

- each gripping device comprises a gripper extending parallel to the first axis with its active end pointing in the direction of the opposite associated gripper;

- each gripper has an active position in which this respective gripper can grip a corresponding lateral end of the strip between its active end and its corresponding support; and and pivotably mounted on each support about an axis perpendicular to the first axis between separate release positions. The actuation means includes 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 rotationally wedged onto the shaft. The shaft extends according to a first axis, and a respective gripper support of the retaining means is carried by a respective flange and is slidably mounted between the flanges.

- each gripper support is associated with a respective connecting rod, which connecting rod is articulated at each end about mutually parallel axes on the one hand on the corresponding support and on the other hand on adjacent flanges; It has become.

- the moving means consists of two cams axially spaced from each other between two flanges (integral with the frame); Each of these cams extends circumferentially about a first axis, and a connecting rod carried by the same flange controls the sliding of each gripper support by providing one roller that interacts with the respective cam. is designed to be controlled.

- the means for placing each gripper in the active position are each constituted by an elastic member arranged between the gripper and its corresponding support, compressing the active end of the gripper in the direction of the respective support;

- Each gripper carries a roller, the release means consisting of two pairs of cams integral with the frame, six pairs communicating with the grippers carried by identical flanges. Each pair of cams consists of a first cam located near the laying and clamping means and a second cam located near the supply means.

The subject of the invention relates to an apparatus for producing synthetic sheets for simultaneously forming diapers. This composite sheet consists of two sheets spaced apart from each other such that they are joined together and have an elastic strip transversely glued therebetween and stretched over a flat composite sheet. a wadding of absorbent material disposed between two adjacent strips.

This equipment includes a machine for tightening the stretched elastic strip in the transverse direction to the first sheet, and a machine for tightening the stretched elastic strip to the first sheet.
and means for clamping the second sheet against the first sheet such that the strip and batting extend between the two sheets.

A feature of the device is that the machine for clamping the stretched elastic strip transversely against the first sheet is constructed as described above.

〔Example〕

(Explanation of synthetic sheets) The synthetic sheet N shown in FIGS. 1 and 2 includes a first sheet made of a flexible and impermeable material, such as a polyethylene film, forming one side of the synthetic sheet; The second sheet 2 is made of a flexible impermeable material such as a non-woven material and forms the other side of the synthetic sheet.

These two sheets 1 and 2 are joined to each other, and a batting 3 of absorbent material, an elastic band 4, and the elastic band 5 are inserted between the two sheets 1 and 2. It is glued with.

Each elastic band 4 extends along a corresponding longitudinal edge of the composite sheet and is stretched when the composite sheet is flat to form longitudinally extending pleats or wrinkles when the composite sheet is relaxed. It will be glued like this. Elastic strip 5
extend transversely within the composite sheet between each longitudinal elastic band 4 at regular intervals from each other. These elastic strips 5 are similarly bonded in such a way that they are stretched when the composite sheet is flat and form transversely extending pleats or wrinkles when the composite sheet is relaxed.

An absorbent wadding 4 consisting of, for example, shredded wood pulp, each extends longitudinally between two adjacent elastic strips and 2
It extends transversely between two longitudinal elastic bands 4.

The elastic material used for the elastic band 4 and the elastic strip 5 may be any type of material currently used in the art, but may include an elastic material consisting of an open cell foam such as PolyFretuff 7 ohm. Preferably the material.

This synthetic material, as described above, can form a diaper when cut along transverse line C (FIG. 2).

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 the Apparatus) In the diaper formed as described above, the longitudinal elastic band 4 is designed to extend around the wearer's thighs, thereby sealing the diaper in this area. The transversely glued elastic strip 5 is further placed around the waist of the wearer so that the diaper is sealed.

The apparatus for producing the composite sheet N shown in FIGS. 3 and 4 comprises a machine 6 for gluing the stretched elastic strip 5 transversely to the first sheet 1 in an assembly station 7. ing.

The elastic strip 5 is formed by a device consisting of rollers 8 (FIG. 4) of an elastic strip 9, in which seeds of absorbent material are similarly cut at regular intervals by a known cutting means 12 of the rotary knife type. The cotton wadding 10 is provided with a cotton wadding 10 for producing cotton wadding 3 from 11. The wadding 3 is conveyed between station 10 and assembly station 7 by a conveyor 13 which deposits each wadding on the sheet 1 between two previously glued strips 5.

The nonwoven sheet 2 is passed from a supply means 14 consisting of two rollers 15, which are unwound one after the other in succession, to an assembly station 7.
transported to.

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

The assembled synthetic sheet (N) is transported from the assembly station 7 to a cutting station (not shown), but beforehand, the synthetic sheet (N) is passed through a pressurizing device to form a diaper. ing. This pressing device consists of two endless belts (not shown) between which the composite sheet is pressed.

Similarly, two strips of elastic material are assembled at station 7.
and are bonded to one side of the first sheet 1 along the corresponding longitudinal edge.

(Overview of the Machine of the Invention) The machine 6 adjoins the assembly station 7 in the frame B partially shown in the upstream direction and includes a stretching station for stretching the elastic strips 5 before they are laid onto the first sheet l. E is provided with means for supplying the strips 5 designed to convey these strips.

These feeding means furthermore consist downstream of a roller 8 for unwinding the elastic band 9 and a tensioning station F where the elastic band coming from the roller 8 is pulled before entering the coating station C. , in which one entire surface of the elastic band is coated with glue, except for two areas each located near one lateral end of the elastic band.

The coaching station G is followed by a relaxing station, where the elastic band 9 is relaxed and then sent to a cutting station I, where the elastic band is cut transversely at regular spacing over its length. The strip 5 is formed into a strip 5 which is distributed to a transport station J which transports the strip 5 from a cutting station E to a stretching station E and supplies the strip 5.

The row 28 is rotatably mounted around a horizontal axis, and the strand of strip 9 coming from this roller rises, passes over the first guide roller 5, descends again, rises again and passes over the second guide roller 26. A loop r is formed between these two guide rollers 25 and 26. A tension roller path is arranged at the bottom of this loop n to ensure tensioning of the elastic band 9. This tension roller swamp can act exclusively by its own weight or can be associated with a tension spring (not shown).

After passing over the second guide row 226, the elastic band 9 is moved between a first deflection roller 29 (FIG. 4) that maintains the direction of movement of the elastic band and a second deflection roller that deflects the movement direction of the elastic band at right angles. Pass Father Laura.

This arrangement using a second deflection roller has the advantage of making it possible to limit the space taken up by the length of the machine by arranging the rollers 8 on one side of the latter.

The elastic band thus stretched by the roller path is directed by the second deflection roller (9), passes under the third guide roller 31, rises again in the oblique direction and passes over the fourth guide roller 32, and then Each of these third. Fourth
It passes between 0 and 31 and 32.

Glue is applied to the upper surface of the nozzle holder elastic band 9.

When it leaves the fourth guide row 232, the glued elastic band 9 descends again and immediately rises to the cutting station 1. Therefore, the elastic band relaxation station H
A separate loop is provided between the cutting station and the fourth guide roller 32, and its presence ensures that the elastic band 9 is relaxed in this vicinity. The cutting station consists of devices forming an anvil post-cutting device 36 which are mounted parallel to each other and rotatable about an axis. The elastic band 9 passes between the cutting device 36 and the device forming the anvil 35 in order to be cut transversely into strips 5 .

The elastic strip 9 is then moved to a stretching station by fingers 37 (FIGS. 5 and 10) carried by a drum link mounted rotatably about an axis parallel to the axis of rotation of the device forming the anvil 35. Transported to E. These fingers 37 interact with the glued surface of the elastic strips 5 and the glued surface of the elastic strips 5 as a result of the rotation of the drum 38, so that these strips 5 each have a pair of It is transported to a stretching station E where its lateral ends are gripped by a gripper 39. These grippers 39 are rotatably mounted around an axis parallel to the axis of rotation of the drum holder of the transfer station J, and grip the strip 5
will be stretched parallel to this axis and placed and glued on the 17th piece 1 at the assembly station 7.

This assembly station 7 is adjacent to the stretching station E, and a gripper 39 is rotatably mounted thereon.

It consists of a drum 40 mounted movably for rotation about an axis parallel thereto.

If the direction of rotation of the ram 400 is considered, the composite plate N is assembled on the circumference of the P ram 40 in the following procedure.

First, a first sheet 1 and a moving drum 400 are placed on a cylindrical surface, and strips 5 are glued to the first sheet extending transversely to the direction of movement and spaced apart from each other by a uniform distance. A longitudinal elastic band 4 coated with glue by the nozzle 41 as described above is applied to each of the lateral ends of the first sheet 1, and a series of nozzles 42 connect the strands of glue to the band 5 and the elastic band. The strip 4 and the first sheet 1 are deposited on themselves, the conyer 13 deposits the absorbent batting 3 between the strips 5 near the top of the drum 40, and the batting 3 is then deposited on the second sheet 1 itself.
The entire composition is adhered to form a composite sheet N as it passes between drum 40 and pinch rollers 43.

The stretched strip 5 is attached to this first sheet supported by a ram 40 and a gripper 39 of a stretching station E.
It is placed on the first sheet 1 and tightened by being sandwiched between two laying tightening rows 244 (FIGS. 3, 7, 8, 9, and 10) extending between . The cylindrical part of the drum 40 where the rollers 44 are applied to the sheet for placing it on the strip 5 thus forms the first sheet 1.
This forms a support surface to which the strip 5 is adhered.

means for supplying the absorbent batting 3, means for supplying the second nonwoven sheet 2, means for supplying the first sheet 1 of impermeable film, means E for stretching the strip 5, and means for supplying the latter. It goes without saying that the laying and tightening means are synchronized with the working speed of the assembled stake 1, ie with the rotational speed of the drum 40 which drives the sheet 1 into its forward movement.

(Explanation of synchronization means) Drum 40 rotationally driven by the device (not shown) itself
is controlled by a variable mechanical transmission consisting of two pulleys, each with an axially movable flange and connected to each other by a chain (Fig. 5), without slipping as in the conventional type. The gripper 39 is driven to rotate. 1st boo January 15 to 9 ram 40 regarding rotation
In conjunction with this, the axial position of the movable flange of this pulley relative to the associated fixed flange is adjusted by a jack or conventional mechanical actuation device. The second pulley 46 is rotationally integral with the grinding chisel 39, and the movable flange of the boot 946 is pressed toward the adjacent fixed flange by an elastic member.

The inner surfaces of the flanges of these pulleys are the pulleys 45.
46 with radial ribs that interact with transverse fingers projecting from the chain 47.

With this configuration, the drawing station E for the strip 5 can be moved to Boo! Even though the winding diameter of each chain 47 of J45, 46 changes, it is variably synchronized with the assembly station 7. In this way, since the working speed ratio of these two stations changes, the spacing between the strips 5 glued to the first sheet 1 can be adjusted, so that:
You can make diapers of different lengths.

The fourth guide roller 32 is rotationally driven by a motor 48 that is controlled by a transmission 49. This transmission 49
on the one hand, as a function of the rotational speed of the device forming the anvil of the cutting station by means of a speed sensor, for example of mechanical or electronic type, connected to the transmission 49; on the other hand, this transmission 49 (also The speed of the fourth guide roller 32 is controlled as a function of the position of the bottom of the loop 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 FIG.

This configuration allows the fourth guide roller 32 to be synchronized with the cutting station H, and on the other hand allows the constant presence of the loop 34 in the loosening 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. On the one hand, this gearbox is connected to a speed sensor 5 of mechanical or electrical type connected to the gearbox, for example.
5 as a function of the rotational speed of the fourth guide 10-ra 32, and on the other hand as a function of the bottom position of the tension loop n of the elastic band 9 by means of a position sensor 56 of mechanical or electronic type connected to the transmission 54, for example. Adjust the speed of 53.

The unwinding speed of the roller 8 for this configuration can be synchronized with the driving speed of the fourth guide row 232 and by controlling the position of the bottom of the loop n it is possible to ensure that the elastic band 9 upstream of this guide roller It becomes possible to pull accurately.

In the glue coating station 23, the nozzle 33 is connected by a pump P (FIG. 5) to a tank 57 containing hot glue held in a molten state by an electrical resistor μs. The flow of glue dispensed by the pump P is adjusted on the one hand as a function of the required thickness of the glue of the elastic strap and on the other hand as a function of the speed of movement of the latter.

The gripper 39 of drawing station E is rotationally integrated with a cogwheel 59 (FIG. 6). This cogwheel 59 is connected to the second cogwheel ω by a chain 61 whose one strand 9 is pulled by a tension pinion 62.
connected to. The cogwheel ω itself is the third pinion 6
It is integrated with a pinion 63 that meshes with the second pinion figure that meshes with 5.

The second pinion 64 is connected by a chain 67 to a fourth cogwheel 68 integral with the drum supporting the fingers 37 of the transport station J in rotation.
It is integrated with the cogwheel in terms of rotation.

The third pinion 65 is rotationally integral with a fifth cogwheel 69 which is connected by a chain 7o to a sixth cogwheel 71 which is rotationally integral with the device forming the anvil 35 of the cutting station. ing.

The rotational speed of the device forming the anvil of the cutting station E is thus synchronized with the speed of the drum 9 of the conveying station J, and the rotational speed of this drum 38 itself is synchronized with the speed of the gripper 39 of the drawing station E. are doing.

Note that the direction of rotation of assembly station 70 drum 400 and that of the drum path of transfer station J are the same. Similarly, the direction of rotation of the grinder 9 of the drawing station E is the same as that of the device for forming the anvil of the station E, and the drum 4 of the assembly station 7 is
This is the opposite of 0. (Please see the arrow R in FIG. 5) (Detailed explanation of the mechanical assembly station and laying tightening means of the present invention) As shown in FIG. It is rotatably installed horizontally between the pillars. The pinch roller 43 is similarly attached to the frame B so that its cylindrical surface substantially contacts that of the drum 40 so that elements of the synthetic sheet N are sandwiched between the roller 43 and the drum and assembled together by adhesive.
Between these two columns, the column 9 is rotatably mounted about an axis parallel to that of the ram 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).

The rollers 44 for laying the stretched elastic strips 5 onto the first sheet 1 supported by the drum 40 are each mounted rotatably about the same axis parallel to the axis of rotation 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. arm 73
extends perpendicularly to the roller 44 at its end opposite the roller 44 about an axis parallel to the axis of rotation of the latter towards the bottom of the frame to which it is joined.

These rollers 44 are mounted at one of their ends on the arm 73;
At the opposite end, the first sheet 1 supported by the drum 40 is pressed by a jack 74 connected to the frame. In this way, the jack 74 connects the first sheet and these laying rows 2 so that it is adhered to this sheet.
It is possible to adjust the force when the stretched piece 5 of the elastic band is sandwiched between the elastic bands 44.

As shown in detail in FIG. 9, the corresponding ends of the shaft 73 each extend along the same axis in opposite directions.
Responsible for the tail shaft of the book. Each of the rows 244 is rotatably mounted on one of these tail shafts 75 and has an elongated strip 5 at its axial end opposite the arm.
At least one annular member 76 designed to increase the axial length of the corresponding roller 44 as a function of the length of the elastic band 9, in other words as a function of the width of the elastic band 9 from which the band 5 is made.
can receive.

8, the cylindrical surface of the drum 400 is provided with a cover 77 made of a material having a low coefficient of friction and a low coefficient of adhesion, such as silicone rubber, so that the first sheet 1 can be moved around the circumference of the drum 400. It is noted that it remains stretched between the laying roller 44 and the gripping roller 43 against the elasticity exerted by the adhesive strip 5, which tends to stretch upward and force it back laterally. will be done. The first sheet 1 is thus held laterally by friction on the cover 77 of the ram 40 so that it becomes completely flat when it passes under the receiving and gripping rows 243 of the longitudinal elastic band 4. .

Stretching Station The stretching station E has a shaft 78 rotatably mounted about an axis parallel to the axis of rotation of the drum 40 of the assembly station 7 after the drum of the transport station J, the shaft 78 being spaced apart in the axial direction. and carries two rotationally wedged flanges 79 extending in a plane perpendicular to its axis of rotation.

In this embodiment, each flange 79 has five merino shafts 39. each extending parallel to the shaft 78 in the direction of the opposite flange. That is, the active end of the gripper is carried by one flange directed towards the opposite flange. Each of the grippers carried by a flange 79 is placed in the same angular position with respect to the shaft 78 and the corresponding glyph ξ 39 carried by the opposite flange 79 and which together form a pair. The stretching station E thus consists of five pairs of grippers placed at equal angular intervals around the shaft 78, each gripper of the same size gripping a corresponding lateral end of the elastic strip 5. It has become.

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

These supports 80, which are equally angularly spaced around the shaft 78, each have a corresponding flange 79.
Two guides 90 and 81 slide through respective grooves 82 fixed to the outer surface of the flange 79.
are respectively slidably attached between the two flanges 79.

Each gripper 39 has a width close to the width of the elastic strip 5 and is joined onto a corresponding support and is housed in a fork provided within this support, the gripper 39 extending radially outside the flange 79. Arranged.

A helical spring 83 is attached at one of its ends to the bottom of the fork provided in each support cabinet, and at its opposite end to a corresponding gripper between the articulation axis of the latter on the support and its active end. Fixed. Each spring 83 is operative to expand to return the respective gripper 39 towards its active position, i.e. the active end of this gripper stands against the corresponding support, and the active end of the latter rests against the latter support. The lateral ends of the elastic strips 5 are gripped between them.

Referring to FIG. 24, the active ends of the grippers 39 extend along the width of the grippers so that they form a kind of nose for gripping the lateral ends of the strip 5 against the support 80. I think you can see that.

In order to control the sliding action of the supports 8o parallel to the axis of the shaft 78, the supports are each in communication with a connecting rod 85, which on the one hand connects the corresponding support 80
On the other hand, they are joined at each of their ends around mutually parallel axes on flanges 79 which carry this support. Each connecting rod 85 carries a roller 86 mounted rotatably about a radial axis parallel to the articulation axis of the end of each connecting rod 85.

The rollers 86 in communication with the articulation n85 carried by the same flange 79 are each in the form of a circumferential groove made in the outer circumference of the corresponding end of the sleeve 88 wedged on the frame 8 through which the shaft 78 passes. Interacts with cam 87.

Thus, the sleeve 88 forms cams at each of its ends that generally limit the range of sinusoidal periods relative to the circumference of the sleeve. These cams 87 are symmetrical with respect to a plane perpendicular to the axis of rotation of the shaft 78.

As a result of the sliding of the support 80, the cam 87 allows the grippers of the six pairs of grippers 39 arranged at the same angular position with respect to the shaft 78 to create a space between them of a length slightly smaller than that of the strip 5. By being close to each other when in the vicinity of the transfer station J forming the gripper pair, each gripper of this pair grips a respective lateral end of the strip 5 provided by the transfer station J against a corresponding support 80. It has an external shape like that.

Furthermore, the outer shape of these cams 87 allows two grippers 39 of the enclosed grippers to be moved relative to each other during rotation of the pair of grippers in a rectangular gap located between the transfer station J and the assembly station 7. It is shaped in such a way that axially moving it apart results in stretching the elastic strip 5 which is gripped by each of its lateral ends in the transport station J. A first sheet 1 on which a pair of grits ξ- is supported on a drum 40
When near the assembly station 7 opposite the grippers, the grits of this pair of grippers are moved as far away from each other as possible, so that the laying rollers 44 extend between these grippers and the support. .

Furthermore, the cylindrical shell delimited by the support 80 around the shaft 78 is in contact with the cylindrical shell delimited by the finger 37 at the turn of the rotational axis of the drum of the conveying station, and the strip 5 conveyed by the finger 37 is The lateral ends are brought into approximate contact with the supports 80 which are to be gripped by their respective grippers 39 at their upper parts.

Similarly, the shaft 7 is gripped by the gripper in the active position.
The cylindrical shell defined around the drum 40 substantially contacts the cylindrical shell defined by the drum 40 so that the stretched piece 5 of the elastic band is connected to the laying roller 44 during rotation of these grippers 39 with the shaft 78. It is designed to be held between one sheet.

Between their actuated position and their contracted position, i.e. the position in which their active ends stand against the corresponding support against the force exerted by each spring 83 and the position in which the springs 83 raise their active ends. The actuation of the grippers between positions for movement away from the corresponding support is effected by the cambelive in synchronism with their axial displacement.

Thus, each gripper 39 has a row 289 mounted at its end opposite the corresponding active end for rotation about an axis perpendicular to the articulation axis of the corresponding gripper on each support. have.

The rollers 89 carried by the grippers 39 in communication with the same seven-run shift 9 are each designed to interact with two respective cams integral with the frame B. (FIGS. 10, 11, 12) Thus, the two first cams 90 are each provided on the corresponding side of the frame in the vicinity of the transport station J, and similarly the second cam 91 is Assembly station 7 respectively
provided on the corresponding side of the adjacent frame.

These first and second cams 90,91 each have a curved shape and are intended to direct the gripper 39 into the release position when the roller 89 is raised against these cams 90 or 91.

The angular position of the cams (3) of the turners on the shaft 78 and the angular spacing over which they extend around this shaft are such that the grippers of each pair of grits are positioned opposite the transfer station JK where they pick up the strips 5. It is such that when gripping it is in the release position, and before reaching the opposite side of this transfer station and when it is being withdrawn from there, it is in the active position.

This feature is illustrated in FIG. 12, which depicts the interaction of the rollers 89 of the gripper 39, shown in solid lines in the released position, with the cam pawl. This same gripper is low 28
In its active position, in which the cam 9 no longer interacts with the cam and the corresponding lateral end of the strip 5 is gripped against the corresponding support by the active end of this gripper, It is shown.

The angular position of the rotation of the shaft 78 and the angular distance that the second cam 91 extends around this shaft are determined by the gripper.
39 are brought to the release position when the stretched elastic strip 5 gripped by their lateral ends is gripped between the laying roller 44 and the first sheet 1 supported by the drum 40, The legs are in an active position before the strips 5 are placed on the sheet, and are to be returned to this active position after the strips 5 have been placed on the sheet.

The transport station J is provided with several pairs of radial fingers 37 defining a cylindrical shell around its axis of rotation, which is approximately tangential to the device forming the annovil of the drum punching and cutting station 1 of the transport station J.

Fingers 37 of the enclosed fingers are arranged axially spaced from each other on the ram 38, one pair of fingers 14' for the drawing station E and for the device forming the anvil of the cutting station E, respectively. The fingers of the fingers of the strips 5 stand against the glued surface of the strips 5 between the two lateral non-gripped portions 5a (FIG. 10), and the fingers of the counter-gripper - the pair of clippers 39 of the stretching station E so as to grip the un-glued lateral edges 5A of the corresponding strip 5 between each of the grippers 39 and their respective supports. Provided the child is in such an axial position that it will be.

In other words, two fingers 3 of the enclosed fingers
The axial spacing between the grippers 7 and 7 is also smaller than that between the two grits ξ-39 of the enclosed grippers when these clippers are located close to each other opposite the transfer station J.

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

The device forming the anvil I comprises a shaft 93 and a bell 92 which is rotationally formed integrally and pivots within the frame B. This bell 92 has an outer cylindrical surface on which the outer surfaces of these anvil members 94 are incorporated into the axially extending bell 92 so as to ensure continuity of the outer cylindrical surface of the bell 92 and are spaced at equal angular intervals in the cylindrical direction. Anvil members 94 in the form of steel bars to be treated are provided and spaced apart from each other.

The cylindrical wall of this bell 92 is still connected to an anvil material 94 and an aspirator (not shown) by a pipe 96.
2, and holes (not shown) distributed throughout this wall are provided between the intake nozzles 95 arranged inside. A pipe 96 passes within the open face of this bell.

The intake nozzle 95 extends axially within the bell near the cylindrical inner surface of the bell, and is fan-shaped so as to extend cylindrically near a portion of the cylindrical wall of the bell 92, generally in the direction of the cutting device 36, i.e. Bell 92 toward the top of Figures 13 and 14
On the outer cylindrical surface of the elastic band 9 and the strip 5 produced by transverse cutting of the elastic band are held by suction.

The cutting device 36 has a shaft 97 rotatably mounted in the frame B parallel to the shaft 93 of the device forming the anvil 35 and housed in the same vertical plane.

The shaft 97 carries three radial knives 98 arranged circumferentially with equal angular spacing, the cutting edges of which extend in the axial direction. The cylindrical shell defined around the shaft 97 by these knives 98 is the bell 9
As a result of the rotation of the shafts 93 and 97 in opposite directions, the elastic band 9 held by the suction air on the outer cylindrical surface of the bell 92 is successively moved by the knife 98 in the vicinity of the anvil material 94. These strips 5
themselves are held by suction on the outer cylindrical surface of the bell 92 and finally they are attached to the fingers 37 of the transfer station J.
It is designed to be held by

The shaft 93 is connected to a shaft 97 of the cutting device, and a pinion 99 (
(FIG. 13), so that the latter is rotationally driven in the opposite direction to the shaft 93 and at the same time synchronized with the latter.

A lever 101 joined on the shaft 93 carries a nozzle 95 at one of its ends inside the bell 92 and at its opposite end controls the transfer station J by changing the angular position of the lever 101 on the shaft 93. Extending in the slot 102 on the outside of the frame B is wedged between two adjustment nuts 1030 that make it possible to vary the angular position of the nozzle 95 relative to the drum shroud.

Since the surface of the elastic band 9 directed toward the knife 98 is the side that has been previously coated with glue, these knives 98 are likely to become contaminated by the glue during cutting of the elastic band 9. In this case, a cylindrical brush 104 is arranged on the shaft 97 and housed in the same vertical plane as this shaft so that the glue is removed by being rubbed against this brush 104 while they rotate. .

To maintain the efficiency of brush 104 during operation, a tank 105 of a suitable cleaning fluid, e.g.
4 is placed on the upper frame, and the bottom of this tank is connected to a sprinkler rack 106 placed on the brush 104 to allow the cleaning liquid stored in the tank 105 to drip and spread thereon.

During the work, the elastic band 9 unwound from the row 28 is stretched in the longitudinal direction by the tension roller 8, and then its upper surface is coated with glue at the K-glue coating indashing station G. Not coated with glue.

After passing over the guide 90-ra 32, the elastic band 9 relaxes in the vicinity of the loop ring, and is then held by the suction air on the outer cylindrical surface of the bell 92, where it is laterally cut (798) by the suction air. It will be held on bell 92.

The six piece 5 is subsequently gripped by a pair of fingers 37 of the transfer station J at the moment this piece leaves the intake zone of the nozzle 95.

On reaching the opposite side of the drawing station E, each strip 5, carried by a pair of fingers 37, meets tangentially a pair of grippers 37, which, after being brought to the release position by means of cams, , immediately returns to its active position, withdraws from these cams and grips the non-glued lateral ends of the strip 5.

During the rotation of the shaft 78, the strips 5 previously gripped by the gripper 39 at the transfer station J are stretched one after another. This is because the grippers of each pair of grippers are axially retracted from each other, and the latter is such that the strip 5 is connected to the laying roller 44 and the gripper 9.
First seat 1 driven to move with ram 40
This is because they are separated as much as possible when engaging between them. - When engaged between the sputum laying roller 44 and the first sheet 1. The gripper 39 releases the strips 5 and comes to the release position and interacts with the cam 91 such that these strips 5, which are kept in an extended state as a result of the pressure exerted by the rollers 44, are moved transversely to the direction of movement of the latter. It is adhered to the extending first sheet 1.

Stretched elastic strips 5 glued in the transverse direction and spaced uniformly
This first sheet 1 is then provided with longitudinal elastic bands 4
You will receive. After that, the absorbent stuffing 3 arranged between the horizontal pieces 5 and finally the second non-woven sheet covering the various elastic members and the absorbent stuffing previously bonded together form a composite sheet N, and each The strip 5 is cut transversely at equal intervals approximately in the center to obtain a diaper.

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

Each block has a groove 20 extending circumferentially on the outer periphery of the corresponding block 200 near its end opposite the adjacent block.
2.

The six grooves define a sinusoidal period along the circumference of each block and interact with corresponding rollers 203 integral with the frame.

The grooves 202 are generally symmetrical about a plane perpendicular to the axis of the shaft 278 and form a cam for controlling the sliding movement of the block in both directions on the shaft 278 during rotation of the latter.

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

These two regions 204 have the same angular position with respect to the shaft 278 and are each angled on the outer circumference of the corresponding block over a length at most equal to the width of the strip 5, as will be explained below. Extends.

These perforated areas 204 correspond to the corresponding blocks 20
Each bushing 207 is rotatably mounted in a circumferential notch adjacent the area 204 of the bushing 204, each communicating with an aspirator (not shown) by a corresponding pipe 206 opening out into each bushing 207.

The internal arrangement of the blocks 200 and their communicating bushes 207 is such that the partial vacuum supplied by the 4B eaves 206 is transmitted to the perforations 205 of the corresponding region 204 of the corresponding block 207. 20
0.

These two pipes 206 are connected to a shaft integral with the frame so that the nozzles 206 can be secured to the blocks 200 and guided when the blocks slide axially on the shaft 278. It passes between two bars 208 parallel to 278. Rollers 203 are connected to these bars and this shaft 27
It is rotatably mounted around an axis perpendicular to the rotation axis of 8.

The cylindrical shell defined by these blocks 200 is approximately tangential to that defined by the fingers 37 of the transport station J and to that defined by the drum 40 of the assembly station 7.

In this alternative, the air intake near the regions 204 is synchronized with the operations of the transport and assembly station and with the movement of the blocks 200 away from each other in axial proximity, so that these regions 204 are connected to a pair of fingers carrying the strip 5. 37, these blocks 200 are in a position close to each other so that air is drawn in through the perforations 205 to hold each lateral end of the strip 5 over each of the regions 204. It has become.

During rotation of the shaft 278 from the transfer station to the assembly station, the two blocks 200
The cam groove 20 extends the strip 5 carried by the cam groove 20.
They move away from each other under the action of rollers 203 that interact within each other.

At the stage where the stretched strip is gripped between the first sheet and the laying roller 44, the intake air is cut off and the strip is released, and the block 200 continues its rotational movement to the adjacent conveying station where the pair of fingers 37 Grasp the new strip provided there by.

In combination with this alternative, finger 3 of transfer station J
7 can be replaced by a conveyor belt which receives the strips from the cutting station and deposits them synchronously on the perforation area of the block 200.

It goes without saying that many other alternatives can be envisaged without departing from the scope of the invention.

Therefore, instead of being deposited on the elastic strip 9, the glue is deposited either downstream on the strip 5 itself or on the first sheet 1 near the part of its face to which the strip 5 is glued. be able to.

Furthermore, knife 98. Finger 37 and gripper 3
It will also be understood that the number 9 is not limited to a particular value, and that the essential point is that the various stations of the machine of the invention are synchronized with each other.

[Brief explanation of the drawing]

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 synthetic sheet as shown in FIG. 1, and FIG. 3 is a partial line diagram of the apparatus of the invention for producing the synthetic sheet as shown in FIGS. 1 and 2. FIG. 4 shows means for feeding the elastic strips to the machine of the invention contained within the apparatus of FIG. Some diagrams, FIG. 5 is an enlarged schematic basic diagram of the machine of the invention included in the apparatus of FIGS. 3 and 4, FIG. 6 shows the means for driving and synchronizing the transport station and the machine of the invention 7 is an enlarged linear side view of the composite sheet assembly station of the apparatus of FIG. 3; FIG. 8 is a partial view taken along line 8--8 of FIG. 9 is an enlarged partial sectional view taken along the line 9-9 of FIG. 7, and FIG. 10 is a plan view of the machine of the present invention seen from above, showing the assembly, installation, and construction of the machine.
Stretching 1. 'A partial depiction of the conveying and cutting station; FIG. 11 is an enlarged linear cross-section taken along 11-11 m of FIG. 10; FIG. 12 shows the passage of the strip from the conveying station to the drawing station; Figure 13 is an enlarged detailed view of a part of Figure 10 depicting the process.
A partial sectional view drawn along line 3-13, Figure 14 is
Enlarged linear side view of the cutting station of the machine of Fig. 15.
The figure is a linear perspective view depicting an alternative example of the stretching means.
5... Elastic strip 7... Assembly station 6...
Machine 13...Conveyor 17...Roller 1
6... Supply means C... Coaching station C... Tension stage C... Transfer station r... Loop 5.26.
...Guide roller 31. 32...1st. 20th-
La E... Stretching station E... Cutting station (4 people in addition) 阜7'r:! J 纂8 Drawing ticket ｑ｜｜ｲｯｱｱｱｶｲｶｶｲｲｶｲｶｶｶｶｶｶｶｶｶｶｶｶｶｶｶｶｮｮｯｶｶｶｶｮｮｲ＼＼＼＼＼＼＼＼＼1.Indication of the case 1986 Patent Application No. 51822 2, Name of the invention: Machine for tightening stretched elastic strips onto a continuously moving sheet, and diaper manufacturing apparatus 3, Relationship to the amended case Applicant Address Name Colgate Palmolive Co., Ltd. Company 4, Agent Address: Room 7, Shin-Otemachi Building, 2-2-1 Otemachi, Chiyoda-ku, Tokyo, 206, Contents of Amendment

Claims (24)

[Claims] 1. A machine for clamping stretched elastic strips to continuously driven sheets, comprising frame means, feeding means for feeding the strip onto the frame means, and a drawer for receiving and stretching the strip. means for coating the elastic strips with an adhesive leaving an uncovered portion of each elastic strip; and placing the stretched coated strips on the sheet near the support surface over which the sheet passes. A machine as described above, characterized in that it comprises means for mounting and tightening, and means for synchronizing the feeding means with the stretching means and synchronizing the movement of the sheet. 2. The stretching means transverse to the direction of movement of the sheet.
Machine according to claim 1, characterized in that it is mounted rotatably about an axis. 3. characterized in that the stretching means comprises means for holding each uncoated lateral end of the strip and means for moving these holding means relative to each other parallel to the first axis. A machine according to claim 2. 4. 4. Machine according to claim 3, characterized in that the moving means are of the cam type. 5. 5. Machine according to claim 4, characterized in that the holding means comprises a gripper connected with actuating means synchronized with the laying and clamping means and the feeding means. 6. Each retaining means comprises a respective gripping device for holding a corresponding uncoated lateral end of the strip, the gripping devices being arranged circumferentially about a first axis and each holding a corresponding uncoated lateral end of the strip. angularly and radially spaced apart so that each gripping device of each holding means has a first axis in the same angular position as a corresponding associated gripping device of the opposite holding means for holding the opposite lateral end of the strip. Machine according to claim 5, characterized in that it is arranged around. 7. 6. Machine according to claim 5, characterized in that each gripper extends parallel to the first axis and has an active end pointing towards the opposite associated gripper. 8. Between an active position, in which each gripper can grasp the corresponding lateral end of the elastic band between its active end and a corresponding support, and a release position, in which this active end of the gripper is free from the support. pivotably mounted on each support about an axis perpendicular to one axis, characterized in that the actuating means comprises means for placing the gripper in the active position and means for releasing the gripper; A machine according to claim 7. 9. 9. Machine according to claim 8, characterized in that the gripper has a support slidably mounted parallel to the first axis. 10. There are two flanges axially spaced from each other on the shafts on which they are wedged against rotation, the shafts extending relative to the first axis and extending relative to the gripper support of each retaining means. 10. A machine as claimed in claim 9, characterized in that it is carried by each flange and is slidably mounted between said flanges. 11. characterized in that each gripper support communicates with a respective connecting rod, said connecting rods being joined at each end thereof about mutually parallel axes and connected at both ends to a corresponding support and to one of said flanges. A machine according to claim 10. 12. The moving means comprises two cams integral with the frame means and axially spaced apart from each other between the flanges, each of the cams extending circumferentially about the first axis. A machine according to claim 11, characterized in: 13. A connecting rod carried by each flange comprises a roller interacting with a corresponding cam in the form of a groove, each roller being rotatably mounted about a radial axis relative to the first axis, the radial axis being 13. Machine according to claim 12, characterized in that it is parallel to the articulation axis of each connecting rod on the support associated with the flange. 14. 14. Machine according to claim 13, characterized in that a cam is formed on the sleeve through which the shaft passes, said cam being wedged on frame means. 15. characterized in that the actuation means for activating each gripper each comprise a resilient member disposed between the gripper and the corresponding support for pressurizing the active end of the gripper in the direction of the respective support; A machine according to claim 14. 16. The release means consists of two pairs of cams integrated with the frame means, and one gripper is carried by each flange.
The cams in each pair communicate with each other, each pair of cams comprising a first cam disposed proximate the supply means and a second cam disposed proximate the laying and clamping means, each gripper having a respective first:second cam. 16. Machine according to claim 15, characterized in that it carries rollers for the interaction of the cams. 17. The laying fastening means comprises at least one roller rotatably carried by an arm integral with the frame means, said roller holding each lateral end of the strip so as to be seated on the sheet near the support surface. 3. Machine according to claim 2, characterized in that each means extends parallel to the first axis. 18. 18. Machine according to claim 17, characterized in that the laying and tightening means consist of two rollers rotatably mounted on each side of the arm. 19. 19. Machine according to claim 18, characterized in that each roller houses at least one annular member increasing the axial length of the roller. 20. Claim 2, characterized in that the supply means further comprises a stretching means and a conveying means synchronized with the supply means, the conveying means conveying the strip from the supply means to the stretching means.
Machines listed in Section. 21. The conveying means includes drums rotatably mounted about a second axis parallel to the first axis, the drums being axially spaced from each other on the outer periphery of the drum and each of the drums being substantially radially oriented. 21. A machine as claimed in claim 20, characterized in that it carries at least one pair of fingers, each pair of fingers adapted to adhere to the surface of a previously grated strip. 22. 3. A machine as claimed in claim 2, comprising a cylindrical member forming an anvil over which the sheet is passed. 23. Machine according to claim 2, characterized in that the holding means are of the suction type. 24. A bell in which the cylindrical member has perforations distributed over its cylindrical surface, the retaining means being mounted on the frame means and arranged within the bell and opposing at least a portion of the inner cylindrical surface of the bell. 23. Machine according to claim 22, characterized in that it comprises an intake nozzle extending near said part.