DE3917093C1 - Process for sealing seams - is for multi-section cover of upholstery parts which have been foamed at back - Google Patents

Abstract

A process for sealing seams is for multi-section covers of upholstery parts which have been foamed at the back. A sealing tape is applied along the seam onto the edge sections adjoining the seam. The cover sections are folded with their edge sections in such a way that seam forms the folding edge, the sealing tape is guided by a guide in its longitudinal direction and folded. The folded sealing tape is positioned on the folded edge sections of the cover parts and joined to the folded edge sections by means of a press device to provide a sealing. ADVANTAGE - The process and associated installation carry out the sealing process quickly and, at least to a degree, automatically.

Description

The invention relates to a method for sealing the seams multi-part covers of foam-backed upholstery parts according to Preamble of claim 1 and a device for Execution of the method according to the preamble of Claim 6, as they are known from practice.

So far, the sealing tapes are by hand over the Cover parts connecting seam arranged and on the edge sections of the reference parts adjacent to the seam sealingly attached to the seam between the cover parts to seal. This is time consuming and affects the  Manufacturing costs of a foam-backed upholstery part in disadvantageously.

DE 36 00 049 A1 describes a method for attaching Seam sealing tapes on ticking panels for outside down quilts known to be quilted, the Seam sealing tapes on the inside of the Cutting the insert plate at a mutual distance in longitudinal and transverse direction by means of a thermally activated adhesive be stuck on. This process is characterized by that the glue in one or more narrow line-shaped Adhesive areas either in a prefabrication on one side seam sealing tape to be used applied or only at Placing the same in the intermediate area between this and the insert plate blank is introduced, and that the Glue on when the seam sealing tape is applied continuously cutting the ticking board by direct heat supply in the Intermediate area is activated. The same is from this Document a device for performing the method known, with a tape roll for continuous feeding of the Seam sealing tape, with a pressure member for pressing the Seam sealing tape against the ticking, with a Movement mechanism for generating a relative movement between the pressure element and the inlay plate blank in Direction of the seam sealing tape, and with one to the Pressure element stationary as well as in the space between the Seam sealing tape and the ticking panel cut Activation member for supplying heat and / or glue.

DE 33 36 356 A1 describes a device, in particular. for multiple folding and solidifying the longitudinal and / or Cross edges of cut from continuous webs Tissue pieces or the like is provided. This device exists from a first pair of flat press rollers, on which in  Direction of conveyance of the fabric piece a pre-folding device second pair of flat press rollers, a pre-folding device and connect a third pair of flat press rollers, all Rotate pairs of rollers synchronously to each other. The folding devices each have one at the bottom of the to be folded Tissue piece edge part attacking and to the tissue piece feed synchronously effective continuous conveyor, so over the press level the tangent flat press rolls protrudes that the continuous conveyor also initiates the folding. Furthermore is next to the continuous conveyor, a stationary one, on the top effective flat hold-down device of a piece of fabric is provided, its longitudinal side facing the edge of the piece of tissue to be folded is arranged in the direction of the folded edge to be formed. Above of the aforementioned first continuous conveyor is a second, from Initiation area of the folding at least into the Press area of the following in the fabric piece conveying direction Flat press roller pair extending and on the folding edge part Attacking continuous conveyor provided outside the Piece of fabric begins and the fold edge crosses.

The invention has for its object a method of type mentioned and a device for carrying out to create this process, the sealing of the Time-saving and connecting seams connecting parts can be carried out at least partially automatically.

This task is procedurally by the characteristics of characterizing part of claim 1 solved. Through the Folding over those adjacent to the common seam Edge sections of the cover parts result in a good one Accessibility to the seam to be sealed, and through the folding of the sealing tape in the longitudinal direction, the advantage is achieved that a secure connection of the folded sealing tape with the edge sections containing the seam as a folded edge  Cover parts is guaranteed so that a good seal of the Seam is given. After connecting the cover parts with the Sealing tape, d. H. after sealing the the cover parts connecting seam can fold the Reference parts are of course canceled again, d. H. the reference parts can again be in a common plane to be stretched to the reference so prepared in in a subsequent operation in a mold, in which is the reference to the manufacture of an upholstered part with a Foam reaction mixture.

It has proven to be useful if the cover parts on a centering sword arranged in front of a guide disc are folded over, the seam of the cover parts on the Cutting edge of the centering sword and the folded over Cover along the cutting edge of the centering sword Guide disc is fed when the guide device is angled for the sealing tape and if the folded over cover parts and that the seam of the cover parts covering folded sealing tape together between the Pressure device can be moved. The folded over Sealing tape can with its folded edge on the Fold edge forming seam of the cover parts fit tightly or preferably have a distance from the seam. This Distance between the folded edge of the sealing tape and the Folding edge forming seam of the cover parts is at the Production of a foam-backed upholstery part therefore advantageous because of this between the seam and the Folded edge of the sealing tape given along the seam of the Covering parts of the web are located inside the foam-backed upholstered part and thus for the Anchoring between the reference parts can form.  

To avoid a delay between the interconnected To prevent cover parts of the cover and the sealing tape, the folded up cover parts with the common seam and the folded sealing tape preferably together corresponding feed speeds between the Pressure device moved through. With this pressure device can be, for example, oscillating stamps between which the cover parts and the sealing tape gradually be moved through. Here is the throughput rate however limited. Therefore it is advantageous if as Pressing device used a pair of drive rollers to be close to each other and with one of the Feed speed of the cover parts and the sealing tape turn the appropriate speed against each other. To this This results in a continuous throughput movement of the Cover parts and the sealing tape between the Pressing device through, the folded sealing tape using the two drive rollers against the edge sections the cover parts are pressed.

The sealing tape can be provided with an adhesive coating, which is a hot glue. In this Case it is useful if at least the sealing tape in the vicinity of the pressure device in the supply section provided heating device heated becomes. Of course it is also possible, besides that Sealing tape also the edge sections of the interconnected To heat reference parts. With the help of the heating device such a quantity of heat is supplied to the sealing tape, that it melts and against with the help of the pressure device the edge portions of the reference parts are pressed to between the folded sealing tape and the edge sections of the Reference parts a sealed mechanically firm connection to manufacture.  

The object underlying the invention will device according to the characteristics of the characteristic Part of claim 6 solved. The guide disc and that Centering sword preferably have a small wall thickness, the wall thickness of the centering sword the wall thickness of the Guide disc can correspond. With the help of Centering swords make it easy and time-saving Cover parts with their sealing seam to be sealed on the Move the cutting edge of the stationary centering sword and to fold over at the same time, the one to be sealed Connection seam forms the folded edge, and that folded cover just centered the guide disc and thus to feed the pressure device. At the same time by means of in the vicinity of the centering sword located guide device folded the sealing tape and preferably at the same feed rate as that folded over movement between the pressing device and by means of the pressing device on the seam adjacent edge sections of the reference parts mechanically firmly and be sealed.

The centering sword preferably has a cutting edge that with an end portion to an inlet peripheral portion of the Guide disc is directed and the pressure device covers the guide disk preferably along one together having the inlet peripheral portion Surface section. That means that the guide disc with the last-mentioned surface section between the Pressure device protrudes. The on the connecting seam adjacent edge sections of the reference parts lie between the Elements of the pressure device not only directly to each other, but they lie along the above Surface section on both the guide washer and  the elements of the pressure device. As before As mentioned above, the pressure device can be stamps oscillating against each other, which the Form elements of the pressing device. It has been advantageous proved, however, if the pressing device is a pair has oppositely drivable drive rollers that are against each other issue. The drive rollers preferably consist of a resilient material. This can be a act heat-resistant rubber or plastic material. Can between the counter-rotating drive rollers the cover folded over the seam and the the guide device folded over sealing tape continuously be moved so that with little effort Payments to the Connection seams of their reference parts can be sealed. Since the device is easy to handle, the result is Advantage that they are also from unskilled or semi-skilled Workers can be served, while the The advantage is that an exact assignment between the Sealing tape and the seam of the cover parts is guaranteed, so that the manufacturing board is minimal.

The one intended for folding over the sealing tape Guide device preferably has a first of the Guide washer distal end portion to the level of Guide disc aligned at least approximately vertically and the guide device preferably has one of the Guide disc and the pressure device facing second End section, which is folded towards the guide disc, the sealing tape on the the centering sword and the Guide disc facing the inside of the guide device is led. Through the perpendicular to the guide disc Orientation of the first end section of the guide device there is the advantage that the folding of the guide band  at least approximately without problems along its longitudinal center line is guaranteed, and that the sealing tape folded over in this way correctly oriented between the two drive rollers is moved through. To the material friction in the device like this keeping the guide disc as small as possible preferably freely rotatable and, for example, highly polished or chrome-plated. The centering sword and / or the Guide device for the sealing tape may be formed. The Drive rollers can have such a coefficient of friction have that with their help the folded sealing tape and the cover folded together along the seam corresponding feed speeds through the device be moved through.

In the feed section in front of the pressing device is in the Neighborhood of the guiding devices for the sealing tape preferably a heating device is provided. With the help of Heating device can the folded sealing tape on a predetermined temperature are heated at which the Sealing tape or a hot melt adhesive provided on the sealing tape melts and a mechanically strong sealed connection with the edge sections of the cover parts of the cover.

The heating device can be in one to the direction of the axes of rotation the drive rollers at least approximately parallel direction be agile. In this way, there is the advantage that to start the device from the drive rollers moving heater the beginning of the folded Sealing tape and the beginning of the folded cover good can be inserted between the drive rollers, after which the heating device in the feed section before the Drive rollers are arranged around the folded sealing tape or melt this hot melt adhesive.  

The heating device can have heating nozzles which on the two opposite sides of the folded sealing tape and the one folded over along the common seam Edge sections of the reference parts in the feed section between the Guide device and the drive rollers can be arranged. The Heating nozzles are preferably aligned such that the hot air flowing out of the heating nozzles into the gap is directed between the drive rollers. In this way there is a targeted heating of the sealing tape in the Area in which the drive rollers against the sealing tape press what a secure seal of the cover parts of the Related connection seam results.

An embodiment of the device according to the invention Implementation of the sealing method according to the invention of joined together along a seam Reference parts are shown schematically in the drawing and is described below. It shows

Fig. 1 is a view of the device from the side,

Fig. 2 is a view of the apparatus looking in the direction of the arrow II in Fig. 1,

Fig. 3 is an enlarged view of detail III in Fig. 2,

Fig. 4 is a spatial representation of the guide device for guiding and folding the sealing tape, and

Fig. 5 is a spatial representation of the device for sealing interconnected by a seam cover parts.

Figs. 1 and 2 show a guide plate 10, in addition to a centering blade 14 is arranged, which is aligned with the guide disc 10. In the vicinity of the centering sword 14 and spaced from it by a certain distance, a guide device 16 is provided which serves to guide and fold over a sealing tape 18 . The reference number 20 denotes a heating device which is provided in the vicinity of the drive rollers 12 . The guide disk 10 extends with a surface section 22 into the gap 24 between the two drive rollers 12 .

The centering sword 14 is formed with a cutting edge 16 along which the reference parts 28 which are connected to one another by means of a connecting seam 48 (see FIG. 3) are guided and folded over and fed to the guide disk 10 and passed between the two drive rollers 12 .

The guide device 16 for guiding and folding over the sealing tape 18 has a first end section 50 which is removed from the drive rollers 12 and is oriented perpendicular to the guide bar 14 or the guide disk 10 . The first end section 50 is thus aligned parallel to the central axis 30 , about which the guide disk 10 is freely rotatable. The guide device 16 has a second end section 52 which is folded over towards the centering sword 14 , as can also be clearly seen from FIGS. 4 and 5. The folding of the guide device 16 increases continuously from the first end section 50 to the second end section 52 .

The first end section 50 is formed with a rounded portion 54 in order to guide the sealing tape 18 to the underside 56 of the guide device 16 , where the sealing tape 18 is folded over. The guide disk 10 rotates about its central axis 30 in the direction of rotation indicated by the arrow 32 . Accordingly, the drive rollers 12 can be driven clockwise or counterclockwise about their central axes 34 or 36 .

The heating device 20 can be arranged in the feed section 38 of the two drive rollers 12 , which is indicated in FIG. 2 by the double arrow 42 . The arrow 39 is intended to illustrate the feed or transport direction of the sealing tape 18 in FIG. 1.

As has already been stated, the cover consisting of two reference parts 28 and connected along the connecting seam 48 is fed along the cutting edge 26 of the centering sword 14 to the guide disk 10 . At the same time, the sealing tape 18 is deflected forward over the first end section 50 along the underside 56 of the guide device 16 in the direction of the arrow 39 , so that the cover with its reference parts 28 or with its edge sections 40 adjacent to the connecting seam 48 together with the sealing tape wherein the folded sealing tape 18 by means of the drive rollers 28 is pressed against the cover at the edge portions 40 of the cover parts 12 is passed through 18 between the two drive rollers 12. In order to effect a seal between the folded sealing tape 18 and the reference parts 28 folded over along their common seam 48 , the sealing tape 18 is subjected to hot air by means of the heating device 20 , so that the sealing tape 18 melts.

As can be seen from FIG. 3, the fold edge of the sealing tape 18 is at a certain distance from the seam 48 forming the fold edge of the cover. A spacing is formed by this distance, which does not become noticeable in the finished foam-backed upholstery because it is located in the reaction mixture or in the interior of the cushion and thus serves to anchor the seam 48 or the edge portions 40 of the reference parts 28 adjacent to the seam 48 .

In FIG. 4, the reference number 44 denotes the original strip-like state of the sealing tape 18 and the reference number 46 the folded state of the sealing tape 18 running on the underside 56 of the guide device 16 .

Fig. 5 shows a spatial representation of the guide disc 10, which is aligned with the guide plate 10 centering blade 14, the heating device 20, the guide means 16 and the two drive rollers 12. The guide device 16 is formed in the vicinity of its second end section 52 with a cutout 58 in order to be able to grip the folded sealing tape 18 and to insert it between the two drive rollers 12 . The arrows 60 indicate the opposite directions of rotation of the two drive rollers 12 . The directions of rotation of the drive rollers 12 correspond to the direction of rotation of the guide disk 10 indicated by the arrow 32 , so that the cover consisting of two reference parts, which is not shown in FIG. 5, can be passed through together with the sealing tape 18 between the two drive rollers 12 . With the aid of the heating device 20 drawn away from the drive rollers 12 or the feed section 38 , the sealing tape 18 folded over by the guide device 10 is melted and sealingly connected to the edge sections of the reference parts which are provided in the vicinity of the seam to be sealed. From Fig. 5 it can be seen that the heating device has heating nozzles 20 62nd

Claims (13)

1. A method for sealing the seams ( 48 ) of multi-part covers of foam-padded parts with a sealing tape ( 18 ) which is applied along the seam ( 48 ) to the edge portions ( 40 ) adjacent to the seam ( 48 ) of the reference parts ( 28 ) and with the Edge sections ( 40 ) of the cover parts ( 28 ) are connected in a sealing manner, characterized in that the cover parts ( 28 ) are folded over with their edge sections ( 40 ) in such a way that the seam ( 48 ) forms the folded edge in such a way that the sealing tape ( 18 ) is closed by a Guide device ( 16 ) is guided and folded in its longitudinal direction, and that the folded sealing tape ( 18 ) is arranged on the folded edge sections ( 40 ) of the reference parts ( 28 ) and is sealingly connected to the folded edge sections ( 40 ) by means of a pressing device ( 12 ) . 2. The method according to claim 1, characterized in that the reference parts ( 28 ) on a in front of a guide plate ( 10 ) arranged centering sword ( 14 ) are folded over, the seam ( 48 ) of the reference parts ( 28 ) on the cutting edge ( 26 ) of the Centering swords ( 14 ) placed and the folded cover along the cutting edge ( 26 ) of the centering sword ( 14 ) is fed to the guide disk ( 10 ), that the guide device ( 16 ) for the sealing tape ( 18 ) is angled, and that the folded reference parts ( 28 ) and the folded sealing tape ( 18 ) covering the seam ( 48 ) of the reference parts ( 28 ) are moved together between the pressing device. 3. The method according to claim 1 or 2, characterized in that the folded-over reference parts ( 28 ) with the common seam ( 48 ) and the folded-over sealing tape ( 18 ) are moved through at corresponding feed speeds between the pressing device ( 12 ). 4. The method according to any one of the preceding claims, characterized in that a pair of drive rollers ( 12 ) are used as a pressing device, which abut each other and which rotate at a speed corresponding to the feed speed of the reference parts ( 28 ) and the sealing tape ( 18 ) against each other. 5. The method according to any one of the preceding claims, characterized in that at least the sealing tape ( 18 ) is heated by means of a heating device ( 20 ) provided in the vicinity of the pressing device ( 12 ) in its feed section ( 38 ). 6. Device for sealing the seams ( 48 ) of multi-part covers of foam-backed upholstery parts with a sealing tape ( 18 ) which can be applied along the seam ( 48 ) to the edge portions ( 40 ) adjacent to the seam ( 48 ) of the reference parts ( 28 ) and with the Edge sections ( 40 ) of the reference parts ( 28 ) can be connected in a sealing manner, characterized in that, for guiding the cover folded over along its seam ( 48 ), a guide disk ( 10 ) and one in front of the guide disk ( 10 ) and aligned with the guide disk ( 10 ) centering blade (14), for guiding and folding the sealing strip (18) which is arranged in the vicinity of the Zentrierschwertes (14) guide means (16) and for sealingly connecting the folded sealing tape (18) adjacent to the seam (48) edge portions (40 ) of the reference parts ( 28 ) a pressing device ( 12 ) are provided, and that the pressing device ( 12 ) in the feed direction of the surrounding The folded reference parts ( 28 ) and the sealing tape ( 18 ) are arranged downstream behind the guide device ( 16 ) and the centering sword ( 14 ). 7. The device according to claim 6, characterized in that the centering sword ( 14 ) has a cutting edge ( 26 ) which is directed with an end portion to an inlet peripheral portion of the guide disc ( 10 ), and that the pressing device ( 12 ) the guide disc ( 10 ) overlaps along a common surface section ( 22 ) having the inlet peripheral section. 8. The device according to claim 6 or 7, characterized in that the pressing device has a pair of oppositely driven drive rollers ( 12 ) which abut each other. 9. The device according to claim 8, characterized in that the drive rollers ( 12 ) consist of an elastically resilient material. 10. The device according to claim 6, characterized in that the provided for folding the sealing tape ( 18 ) guide means ( 16 ) has a first from the guide disc ( 10 ) distal end portion ( 50 ) which is at least approximately perpendicular to the plane of the guide disc ( 10 ) and that the guide device ( 16 ) has a second end section ( 52 ) facing the guide disk ( 10 ) and the pressing device ( 12 ), which is folded over towards the guide disk ( 10 ), the sealing band ( 18 ) on the centering sword ( 14 ) and the guide disk ( 10 ) facing inside ( 56 ) of the guide device ( 16 ) is guided. 11. Device according to one of claims 6 to 10, characterized in that a heating device ( 20 ) is provided in the feed section ( 38 ) in front of the pressing device ( 12 ) in the vicinity of the guide device ( 16 ) for the sealing tape ( 18 ). 12. The apparatus according to claim 11, characterized in that the heating device ( 20 ) in an at least approximately parallel to the direction of the axes of rotation ( 34, 36 ) of the drive rollers ( 12 ) is movable. 13. The apparatus according to claim 11 or 12, characterized in that the heating device ( 20 ) has heating nozzles ( 62 ) which on the two opposite sides of the folded sealing tape ( 18 ) and along the common seam ( 48 ) folded over edge portions ( 40 ) the reference parts ( 28 ) can be arranged in the feed section ( 38 ) between the guide device ( 16 ) and the drive rollers ( 12 ).