EP2253752A2 - Supply device - Google Patents

Abstract

The device (32) has a roll retaining device (34) in which a set of material rolls (24, 26, 28, 36, 38, 40) is storable, where the rolls are rotatably supported in holders (42) of the roll retaining device. Workpiece layers (16, 18, 20) of a large-area work piece i.e. bed sheet, are drawn from the rolls, made of a flexible material i.e. foam, and are alternatively fed from the retaining device to a sewing device of a sewing machine (14) i.e. multi-needle sewing machine. Another set of material rolls (92, 94) is supported in another roll retaining device (22) directly adjacent to the machine. An independent claim is also included for a method for feeding workpiece layers from a supplying device to a sewing machine.

Description

The present invention relates to a storage device for having a sewing machine having at least one sewing machine, in particular a multi-needle sewing machine Nähnahlagen a large-area fabric, such as mattress plates, which consists of several, especially at least two fabric layers, preferably with a fabric layer of elastic material, such as foam, and a fabric layer as cover layer, consisting of at least one roll receptacle in which at least two rolls of material can be stored. The invention further relates to a method for feeding a fabric layer from a stocking device to a sewing machine having at least one sewing machine, in particular a multi-needle sewing machine, in which in particular at least two fabric layers, preferably consisting of at least one fabric layer of elastic material, such as foam, and a cover layer, large-scale sewing materials, such as mattress sheets are sewn, two material rolls are arranged with fabric layers in the storage device in two holders of a roll holder and a first fabric layer deducted from a holder of the roll holder and the sewing machine is supplied.

Generic devices and methods are known per se from the prior art. Stocking devices of this type serve to provide the sewing material to be sewn, in particular individual fabric layers for processing by the sewing unit. The sewing unit may have a Nähgutauflage with a above the Nähgutauflage arranged presser foot and a needle bar, in which a plurality of needles are arranged. Below the formed as a perforated plate Nähgutauflage For example, the sewing unit has a number of grippers, in particular corresponding to the number of needles, which are fastened to a gripper bar. Grippers and needles are moved in an oscillating manner in order to carry out, for example, chain stitches or double chain stitches or the like in the sewing material resting on the sewing material support. The material to be sewn is preferably provided by the storage device in the form of unwinding from a roll of material. In this case, a separate roll of material is provided for each material layer.

A storage device of the generic type discloses, for example, the DE 203 17 988 U1 in which material rolls arranged horizontally one after the other are arranged corresponding to the number of material layers. In a frame, a guide device is arranged for each roll of material, in which the respective roll of material of the fabric support is inserted. Such a guide device allows the storage of the roll of material with its lateral surface on a conveyor belt.

Vertically above each roll of material, a further roll of material is provided by means of a lifting device, so that the lower roll of material can be replaced by lowering the arranged above her roll of material, as soon as the fabric of the lower roll of material has been completely unwound or should be changed.

Although this storage device has already advantages in terms of set-up times and manual handling of difficult in practical operation material rolls, but is still not a satisfactory solution, since, for example. The change of fabric layers within different batches is still time-consuming.

In addition, methods for sewing a sewing material, in particular from at least two, preferably large-area fabric layers by means of an upper and a lower thread are known. Such methods are carried out, for example, on lockstitch machines, preferably lockstitch machines, in which a needle with the upper thread penetrates into the sewing material and the upper thread is connected to the lower thread. For this purpose, a gripper engages with the lower thread in a loop formed during retraction of the needle through the upper thread, whereupon the connection between upper thread and lower thread is made. When applying or after cutting the upper and lower thread after finishing the seam arise in the region of both surfaces of the sewing thread ends, which are usually cut off manually. This process is time consuming and can cause damage to the material, for example, if the material is damaged during cutting.

On the device side, it is an object of the invention to develop a storage device and a method for feeding a material layer from a storage device to the effect that the handling easier and the set-up time can be reduced.

As a solution with the invention, a storage device is proposed, wherein each roll of material is rotatably mounted in a holder of the roll holder and wherein from the arranged in a roll receiving material rolls fabric layers are removable and fed to the sewing unit, the Nähgutlagen from a role recording the sewing unit can be fed alternatively.

Because each material roll is rotatably mounted in a holder of the roll receptacle, not only can the material rolls active during a sewing process provide material layers, but the fabric layers of the available material rolls can be assembled in any desired manner. This makes it possible to staple with an empty roll of material simply by, for example, attaching the Nähgutlagenanfangs an associated roll of material to the Nähgutlagenende an empty roll of material, so that a quasi-continuous continuation of the sewing process can be achieved. Only for the short period of switching operation of the reference of the fabric layer from one roll of material to the other roll of material set-up time is required. The stitched fabric layers can also vary from each other, for example, if another fabric is to be produced by the sewing unit. In this way, a high flexibility can be achieved with a short set-up time. Particularly with increasing number of fabric layers, the storage device according to the invention proves to be advantageous because in this way the set-up times can be reduced enormously. The alternative feedability of fabric layers from a roll receptacle thus makes it possible to achieve a high degree of flexibility with regard to the production of sewing material by the sewing unit.

Advantageously, each roll of material is rotatably mounted in a holder. This makes it possible to incorporate each roll of material almost arbitrarily in the production process of the sewing material. These are not manually consuming measures, such as replacing material rolls or the like required. It allows the holder to replace the held roll of material in a simple manner as needed. With the holder, a simplified and faster provision of a fabric layer of a roll of material can be achieved. Preferably, the holder is part of the roll holder. The roller receptacle can be formed for example by a frame, in which one or more holders are used or retracted. The holder may have suitable means by which it can hold the roll of material in the desired position. The rotatable mounting of the roll of material can be formed for example by rotatable rollers on the holder on which the roll of material is stored. In addition, the roll of material may be coaxially connected to a rotatably mounted shaft provided on the holder, whereby the rotation of the roll of material can be ensured. The holder itself may be articulated relative to the roller receiving, so that it is pivotable relative to this. In addition, the holder may be formed as a carriage, which is preferably movable horizontally relative to the roller receptacle, so that a roll of material can be moved from or into the roll receptacle. It may be provided that the holders of the roll receptacle are arranged substantially horizontally next to one another or vertically above one another. This allows easy connection of the material layers to be joined.

It may be provided that material layers of adjacent material rolls are connected to one another. As a result, the new material layer can be introduced by the preceding material layer substantially automatically into the production process of the material.

Furthermore, it is proposed that in the holders of a roll receptacle substantially the same or at least in terms of the essential properties for the sewing process similar material is storable or is stored. This makes it possible to produce large quantities of particularly large-area fabric, which can be achieved due to the low Rüstaufwandes high nutrient of the sewing unit. The production speed is thus determined essentially by the speed of the sewing unit.

According to a development, each holder has at least two spaced-apart cantilever arms and an axis of rotation extending between the cantilevers for receiving a roll of material. In this way, a simple rotatable mounting of the Material roll can be achieved on the holder. For assembly purposes it can be provided that at least one of the cantilevers is pivotally mounted on the holder. This makes it possible to introduce the roll of material in a simple manner in the holder and to connect with the axis of rotation, for example, the roll of material is inserted into the holder, the axis of rotation inserted through the roll of material and offset with the cantilevers by a pivoting movement in a rotatable mounting of the roll of material becomes. The cantilever can thus be pivoted out of the range, by which the roll of material from the holder is removable or can be introduced.

The holder may be like a trough, approximately semicircular in cross-section, wherein it is adaptable to the outer contour of the roll of material. This embodiment is particularly suitable for the case that the roll of material is not supported by a rotation axis on the holder. In this embodiment, the outer contour of the roll of material runs on the holder during the peeling process of the fabric layer. A constructive and reliable design of the holder can be achieved. Moving parts can be avoided. So that the storage can be further improved in terms of its reliability, the holder is preferably adaptable to the outer contour of the roll of material.

Furthermore, it can be provided that the holder has a friction-reducing surface, which faces the roll of material. This makes it possible on the one hand, to reduce drive energy for removing the fabric layer and to reduce the second influences, in particular on the fabric layer due to the removal of the roll of material. The friction-reducing surface may be formed by, for example, a polished or chrome-plated steel surface or the like. As a result, unacceptably high tensile forces on the fabric layers can be avoided.

A further embodiment of the holder can provide that the holder has a plurality, at least two rollers which are rotatably mounted in the holder and on which the roll of material can be placed. In this way, a simple storage of the roll of material can be achieved with low friction. In particular, this embodiment proves to be advantageous because the fabric layer is mechanically unclaimed except by the forces occurring during withdrawal. Especially with sensitive fabric layers, this proves to be advantageous.

A further embodiment provides that several, at least two roller receptacles for recording each of at least two rolls of material in a substantially horizontal plane next to each other, preferably arranged such that the axes of rotation of the rolls of material are aligned substantially parallel to each other. Due to the parallel alignment, it is possible to achieve that the individual material layers of the material rolls can be guided in a simple manner to the sewing unit, without requiring complicated alignments of the respective material layers relative to one another. This reduces the stress on the fabric layers during processing. The orientation in a substantially horizontal plane moreover allows the material layers to be loaded substantially uniformly in the transverse direction, in particular in the case of large-area fabric. Moreover, this is advantageous for the processing by the sewing unit, because the individual fabric layers can be supplied with substantially homogeneous voltage. Disturbances in the large-area fabric such as ripples or the like can be largely avoided.

At least the upper holder of a roller holder may have a receiving device with which a roll of material in the upper holder can be conveyed. In this way, the partially heavy rolls of material, which often have a weight of 50 kg or more, can be handled with ease. It is no longer necessary to promote the roll of material with high manual effort in the upper holder. Instead, the roll of material can be inserted into the receiving device, and at least partially automatically conveyed to the intended position in the holder. This can also save time.

A further embodiment provides that the receiving device has a carriage with an at least partially engageable on the roll of material support surface which is movable relative to the holder between an inserted and an extended position and in an aligned with the extended position end position is formed bendable relative to the holder. This makes it possible to guide the roll of material during the feeding of the holder safely and to introduce in a simple manner in the holder. In addition, this embodiment is particularly suitable for at least partial automation, so that substantially without manual intervention, the roll of material can be introduced into the holder.

In longitudinal section of the carriage may be formed substantially L-shaped and form a leg for a supporting system for the roll of material. This way, in the angled end position relative to the holder a supporting system for the roll of material are formed by these rests due to their weight on the leg. The roll of material is thereby kept safe with respect to tilting relative to the carriage. Along with the angling, a feed position can be provided which allows easy loading of the holder with a roll of material.

The support surface may also consist of several rotatably mounted in the carriage rollers or rollers. This makes it possible to axially position the roll of material in the retracted state of the carriage in a simple manner.

Between the carriage and the receiving device, a force accumulator and / or a linear motor can be arranged. The energy storage device and / or the linear motor can ensure that the holder can be pulled with the roll of material in the intended position of the roll holder substantially. Manual intervention can thus be largely avoided. In addition, this can achieve an automation of the loading of the role recording. The linear motor can be designed as a hydraulic or pneumatic cylinder and / or the energy storage as a tension spring, which can be tensioned during a movement of the carriage from the inserted to the extended position.

A further embodiment provides that the roller receptacle has a support frame, on which the holders are each formed as two spaced apart with the support frame cantilevers, between which a roll of material is rotatably mounted, wherein in the cantilevers a rod or roller can be inserted, which rod or roller passes through the roll of material centric. This embodiment is suitable, for example, when the roll of material to be spent by means of a lifting device, such as a stacker in the holder. Thus, the roll of material can be stored in the holder, wherein it first rests on a base of the holder. In order to store the roll of material rotatably, the rod or roller is now inserted into the roll of material, this centered cross-cutting and then inserted into the cantilever arms, so that a rotatable mounting of the roll of material can be achieved. Preferably, the roll of material for this purpose is only slightly raise, so that a simple handling can be achieved. The fact that the holder is provided, at the same time a safe handling can be achieved, so that even with assembly errors or the like dangerous states Slipping of the roll of material or the like can be avoided.

It is further proposed that at least one cantilever arm of each holder is designed to be displaceable relative to the support frame, preferably pivotable about a parallel to the rod or roller axis and / or a vertically aligned axis and / or removable. Thereby, the mounting of the roll of material on the holder can be further simplified by, for example, for assembly purposes, the cantilever is moved so that it releases the roll of material laterally. This can then be removed from the holder. Conversely, it can be achieved that for setup purposes, the roll of material is introduced into the holder, the rod or roller is inserted centrally into the roll of material and by moving back the cantilever material rolls the desired position relative to the holder is brought, so that a rotatable mounting is ensured. Preferably, the cantilever arm can have a drive with which at the same time an optionally required lifting of the material roll relative to the holder can be achieved.

A further embodiment provides that at least two holders of a roller receptacle is assigned a connecting and guiding device for the material layers to be deducted from the material rolls. With the connection and guide device can be achieved that a material layer is held by a roll of material for connection to one end of another fabric layer, which is currently not included in the manufacturing process. This embodiment is suitable, inter alia, for switching over material layers, for example, when different material layers are arranged on the material rolls of the respective two holders. But even for a continuation of a fabric layer, which is unrolled from a roll of material of a holder, a simple continuation can be achieved by the beginning of the other fabric layer is coupled to the end of this fabric layer. For this purpose, the connection and guide device perform a connection of the end of a fabric layer with the beginning of the other fabric layer.

The connecting and guiding device may have two spaced-apart clamping devices with which at least one fabric layer can be clamped. This embodiment makes it possible to have ready a beginning of a fabric layer for a fast connection. By the clamping device can be further achieved that the two ends to be joined in a predetermined position be fixed to each other, so that a simple connection of the two ends can be achieved.

Each clamping device can furthermore have at least one roller which can be pivoted relative to the material position. This makes it possible to adjust the clamping action of the clamping device and to adapt to the respective material to be clamped position.

The invention further proposes a method for feeding a material layer from a storage device to a sewing machine, wherein the second, next to, above or below the first fabric layer arranged fabric layer withdrawn as needed from the second roll of material in the second holder of the roll holder and fed to the sewing machine becomes. According to the invention, two material rolls with material layers in the storage device are arranged in two holders of a roll receptacle, and a first fabric layer is pulled off a holder of the roll receptacle and fed to the sewing machine. This makes it possible to change the Nähgutlagen needs, without causing major assembly work. In particular, short set-up times can be achieved because the rolls of material, from which the fabric layers are provided as needed, are immediately available. It can be provided that a change of fabric layers can be performed. However, it can also be provided that only the ending material layer of the first material roll is extended by the fabric layer of the second material roll. The invention is not limited to the arrangement of the fabric layers above or below. The fabric layers may also overlap or be arranged side by side or in combination thereof.

It is proposed that the second fabric layer be connected to the end of the first fabric layer. This embodiment is particularly suitable for the continuation of Nähgutlagen in which a first roll of material is unwound and the fabric layer is to be extended by the second fabric layer, so that the sewing process can be continued. Through the connection, the second material layer is automatically drawn into the sewing unit with the processing of the first material layer. Re-threading or the like can be saved.

Furthermore, it is proposed that the first material layer be separated before the connection with the second material layer substantially perpendicular to its longitudinal extent in two sections, in particular cut. This embodiment is suitable for to change the sewing process by continuing with another fabric layer. In this case, the first fabric layer is cut off so that the fabric can be completed as intended. This is then immediately followed by the second fabric layer, which is intended for another fabric. As a result, a simple, flexible production control can be achieved by different materials can be produced in virtually any way.

Advantageously, the ends to be joined together are arranged butt-abutting and connected to each other with at least one adhesive strip that overlaps both ends. By the adhesive strip, a reliable connection can be achieved, so that the second fabric layer can be inserted through the first in the sewing machine. An inexpensive connection can be achieved.

It may also be provided that the ends to be joined together are arranged overlapping one another and connected to one another at least one, both ends by cross-connecting element, such as a plastic thread. This embodiment is particularly suitable when the ends of the fabric layers to be joined have different thicknesses or the fabric layers are not suitable for the attachment of an adhesive strip. A reliable connection can also be achieved for a wide variety of sewing material layers.

It can be provided that the fabric layers are stored in the form of rolls of material in the roll receptacle one above the other and / or next to each other. From a production point of view, it proves to be advantageous if material layers to be joined of different material rolls are arranged as close as possible to one another. This allows a particularly simple construction and a simplified manufacturing process can be achieved.

A further development provides that in the holders of a roll holder substantially the same or at least in terms of the essential properties for the sewing process similar material is stored. Essential properties are, for example, the procurement of the material, for example material properties, load-bearing capacity, elasticity or the like. This embodiment is particularly suitable for the production of large-area sewing material.

Furthermore, the material layers to be joined together can be fixed relative to each other in their position before connecting their ends. This makes it possible to achieve a reliable connection of the fabric layers with each other. In particular, it can be achieved that the fabric layers abut butt together over the entire transverse extent in order to be bonded. In addition, a largely uniform overlap region can be achieved, which allows reliably connecting the two fabric layers with a plastic thread.

A stocking device according to the invention can also be provided for a sewing material material designed as cover layers. This material is usually very often subjected to a material change in the production of quilts or mattress plates, so that especially in this area a quick change possibility between different, arranged in a roll receiving cover layer materials proves to be advantageous. Preferably, these fabric layers are arranged in the area immediately before the sewing unit. It should also be noted that the rollers with the cover layers usually have a smaller diameter due to the material thickness of the cover layers, as those rollers on which elastic foam material is wound.

Further advantages and features can be found in the following description of exemplary embodiments. Substantially identical components are designated by the same reference numerals. Furthermore, with regard to the same features and functions, reference is made to the description of the exemplary embodiment Fig. 2 directed. The drawings are schematic drawings and are merely illustrative of the following embodiment.

Fig. 1

ein Nähaggregat mit einer Bevorratungseinrichtung des Standes der Technik in einer schematischen Seitenansicht;

Fig. 2

eine perspektivische Ansicht eines Nähaggregats mit einer Bevorratungseinrichtung der Erfindung;

Fig. 3

eine schematische Seitendarstellung der Bevorratungseinrichtung nach Fig. 2;

Fig. 4

einen Ausschnitt einer Rollenaufnahme der Bevorratungseinrichtung gemäß Fig. 3 mit zwei übereinander angeordneten Materialrollen in einer Seitenansicht;

Fig. 5

die Rollenaufnahme nach Fig. 4 mit einem teilweise seitlich herausgefahrenen Halter und

Fig. 6

die Rollenaufnahme nach Figuren 4 und 5, mit einem in einer seitlich gekippten Stellung angeordneten Halter.

Show it:

Fig. 1

a sewing unit with a storage device of the prior art in a schematic side view;

Fig. 2

a perspective view of a sewing unit with a storage device of the invention;

Fig. 3

a schematic side view of the storage device according to Fig. 2 ;

Fig. 4

a section of a roll receiving the storage device according to Fig. 3 with two superimposed material rolls in a side view;

Fig. 5

the role recording after Fig. 4 with a partially laterally extended holder and

Fig. 6

the role recording after FIGS. 4 and 5 with a holder arranged in a laterally tilted position.

Fig. 1 shows a schematic side view of a storage device 10 for at least one sewing unit having sewing machine 14, are made with the mattress plates, which in the present case of three fabric layers 16, 18, 20 are each deducted from a roll of material 24, 26, 28. In the present case, the fabric layer 18 is made of elastic material, namely foam. The fabric layer 20 forms a cover layer. The fabric layer 16 is made of inelastic material.

The fabric layers 16, 18, 20 are deposited on each other when rolling and form the sewing material to be sewn, which is supplied to the sewing unit via non-designated guide rollers. The supply of the fabric layers 16, 18, 20 is provided by the force acting on the fabric. In the sewing unit, the fabric layers 16, 18, 20 deposited on each other are sewn together to form the sewing material. The material is discharged via non-designated guide or deflection rollers which provide, inter alia, a tightening of the material in the exit region of the sewing unit, and fed to further processing.

Above each of the material rolls 24, 26, 28, a spare roll is mounted in each case, which serves to replace the material roll arranged thereunder. For this purpose, first the corresponding roll of material 24, 26, 28 to remove, so that space for receiving the material roll arranged above it is created. The latter is then manually lowered to the position of the preceding roll of material 24, 26, 28. After a threading process, the production process of the sewing material can be continued.

In this prior art, it proves to be disadvantageous that at a required change at least one of the three Nähgutauflagen 16, 18, 20 or if one of the Material rolls 24, 26, 28 has run empty, the corresponding roll of material 24, 26, 28 is replaced. For this, the sewing machine 14 must be stopped completely. The conversion requires a lot of time, especially because the material rolls are relocated. Fig. 2 shows now a storage device 32 according to the invention with three roller supports 34. Each roller receptacle 34 has in the present case two holders 42, which are each arranged in pairs vertically above one another. In the present case, the three roller receivers 34 are arranged horizontally one behind the other, so that the respective material layers can be deposited on one another during the removal of material rolls 24, 26, 28, 36, 38, 40 arranged in the holders 42.

Each holder 42 receives a respective material roll 24, 26, 28, 36, 38, 40. Each of the material rolls 24, 26, 28, 36, 38, 40 is rotatably mounted on its respective holder 42. Fig. 3 shows the storage device in a schematic side view.

The holders 42 are part of the roller holder 34. Of the arranged in one of the roller holder 34 material rollers 24, 26, 28, 36, 38, 40, the corresponding fabric layers are removable and the sewing unit can be fed. The sewing unit is in the present case a sewing unit, as previously stated with respect to the prior art. The holders 42 of the roller holder 34 are arranged substantially horizontally next to one another.

In the holders 42 of the roller receptacle 34, essentially the same or at least material similar to the essential properties for the sewing process is presently supported. Thus, upon reaching one end of a rolled on the material roll 24, 26, 28, 36, 38, 40 first fabric layer directly on the vertically adjacent roll of material 24, 26, 28, 36, 38, 40 are switched by only a beginning of the second Fabric layer of the vertically adjacent roll of material is connected to the end of the first fabric layer.

How out Fig. 3 it can be seen, each holder 42 has two spaced apart cantilevers 44 and extending between the cantilevers 44 axis of rotation 46 for receiving the respective roll of material 24, 26, 28, 36, 38, 40th

Each of the holders 42 has a plurality of rollers 48 which are rotatably mounted in the holder 42 and on which the roll of material 24, 26, 28, 36, 38, 40 can be placed. As a result, a roll of material resting on the rollers 48 can be moved axially in the longitudinal direction of the holder 42 without much effort. This configuration makes it possible to replace not only the material roll 24, 26, 28, 36, 38, 40 simplified, but it also allows the roll of material 24, 26, 28, 36, 38, 40 to adjust in its axial position.

In the present embodiment, it is further provided that the storage device 32 consists of three roller receivers 34, which are each formed adjacent to each other for receiving two material rolls 24, 26, 28, 36, 38, 40 in a substantially vertical plane, so that rotation axes 46 the material rolls 24, 26, 28, 36, 38, 40 are aligned substantially parallel to each other. Fig. 4 shows the roller receptacle 34 for the material rolls 16 and 24th

It is further provided that in each case the upper holder 42 of the roller receptacle 34 has a receiving device 50 with which a roll of material 24, 26, 40 can be conveyed into the respective upper holder 42 ( FIGS. 4 to 6 ). For this purpose, the receiving device 50 has a carriage 52 which has a bearing surface 54 which can be placed on the material roll 24, 26, 40. The carriage 52 is movable relative to the holder 42 between an inserted and an extended position and formed in an aligned with the extended position end position relative to the holder 42 angled ( FIGS. 5 and 6 ).

Like from the FIGS. 5 and 6 it can be seen, the carriage 50 can be pivoted about an axis 56, so that it can be bent in the extended end position to the holder 42 such that the roll of material 24, 26, 40 simply removed or. can be used.

In the present case, the carriage 52 is formed in longitudinal section L-shaped. The carriage 52 forms a leg 58 as a supporting system for the roll of material 24, 26, 40. As a result, in the extended and tilted end position, the roll of material 24, 26, 40 are replaced in a simple manner.

The support surface 54 is presently formed of a plurality of rotatably mounted in the carriage 52 rollers 48. By the rollers 48, the roll of material 24, 26, 40 in the retracted position of the carriage 52 without much effort in the desired axial position to be moved.

Between the carriage 52 and the receiving device 50, a linear motor 60 is articulated, with which the carriage 52 can be moved between the retracted and the extended position. A manual intervention for positioning the carriage 52 can thus be substantially saved. The arrangement of the carriage 52 and the articulation of the linear motor 60 also allows the carriage 52 can be tilted during its movement at the same time also in the appropriate position. An ejection of the carriage 52 thus also causes at the same time tilting about the axis 56, so that with a single drive the carriage 52 can be moved from its material preparation position in its role change position (see. 4 to 6 ).

The linear motor 60 is designed as a pneumatic cylinder. In addition, the linear motor can of course also be designed as a hydraulic cylinder or by using a tension spring as an energy storage.

The roller holder 34 has a support frame 62, on which the holder 42 are formed as two spaced apart with the support frame 62 cantilevers 44, between which a roll of material 24, 26, 28, 36, 38, 40 is rotatably mounted. In the cantilevers 44, a rod as a rotation axis 46 can be inserted, which rod or roller, the material roll 24, 26, 28, 36, 38, 40 passes through centrally.

In order to replace the roll of material 24, 26, 28, 36, 38, 40, a respective cantilever 44 of each holder 42 is displaceable relative to the support frame 62, namely formed about an axis parallel to the axis of rotation 46 extending axis. This makes it possible to pivot away the respective cantilever arm 44 preferably downwards, so that the carriage 52 is released for movement of the respective material roll 24, 26, 40 in the axial direction with the material roll 24, 26, 40 placed thereon.

From the Figures 2 and 3 It can also be seen that in each case two holders 42 of a roller receptacle 34 are assigned a connecting and guiding device 64 for the material layers to be deducted from the material rolls 24, 26, 28, 36, 38, 40. This makes it possible to fix a beginning or end of a fabric layer of a respective non-operational material roll. For this purpose, the connection and Guide device 64 two spaced-apart clamping devices, with which the respective fabric layer is clamped fixable. Not shown is that each clamping device has at least one relative to the fabric position pivotable roller.

• Aus der Bevorratungseinrichtung 32 werden Nähgutlagen 14, 16, 18 einer ein Nähaggregat aufweisenden Nähmaschine 14 zum Zwecke des Vernähens zugeführt. Die Bevorratungseinrichtung 32 weist hierfür sechs Materialrollen 24, 26, 28, 36, 38, 40 auf, von denen jeweils Nähgutlagen 16, 18, 20 abgezogen werden können. Die Materialrollen 24, 26, 28, 36, 38, 40 sind paarweise in Rollenaufnahmen 34 vertikal übereinander angeordnet.

The method sequence for feeding a material layer is described below:

• From the stocking device 32, fabric layers 14, 16, 18 are fed to a sewing machine 14 having a sewing unit for the purpose of stitching. For this purpose, the storage device 32 has six material rolls 24, 26, 28, 36, 38, 40, from each of which material layers 16, 18, 20 can be pulled off. The material rolls 24, 26, 28, 36, 38, 40 are arranged in pairs in roll receptacles 34 vertically above one another.

As Fig. 2 shows, it is provided that the material rolls 24, 26, 28 provide fabric layers 16, 18, 20, which are stored on each other and the sewing unit via unspecified deflection and guide rollers are supplied. The fabric layers 16, 18, 20 are sewn in this case to mattress panels. Two material rolls 24, 26, 28, 36, 38, 40 with material layers 16, 18, 20 are arranged in the storage device 32 in two holders 42 of a roll receptacle 34, wherein a first fabric layer 16, 18, 20 of a holder 42 of the roll receiving 34 withdrawn and the sewing machine 14 is supplied.

If necessary, the above or below the first fabric layer 16, 18, 20 arranged fabric layer 16, 18, 20 deducted from the respective second roll of material 24, 26, 28, 36, 38, 40 in the second holder 42 of the corresponding roll holder 34 and the Sewing machine 14 are supplied. For this purpose, the second fabric layer 16, 18, 20 is connected to the end of the first fabric layer 16, 18, 20. For this purpose, the first fabric layer 16, 18, 20 can be cut off at its end substantially perpendicular to its longitudinal extent prior to connection to the second fabric layer 16, 18, 20, to form a straight edge.

The ends to be joined together are butted against each other and connected to each other with an adhesive strip both ends. By a continuation of the manufacturing process thus the second fabric layer 16, 18, 20 automatically conveyed by the first fabric layer 16, 18, 20 to the sewing unit for the continuation of the sewing process. Assembly activities for exchanging material rolls 24, 26, 28, 36, 38, 40 can thus be reduced to a minimum or take place independently of the respective production process. The fabric layers 16, 18, 20 are stored in the form of material rolls 24, 26, 28, 36, 38, 40 in the roll receptacle 34 one above the other. Material rolls 24, 26, 28, 36, 38, 40 arranged in the holders 42 of a roll receptacle 34 have the same or at least similar materials with regard to the essential properties for the sewing process.

In order to be able to achieve a good connection of the ends of the fabric layers 16, 18, 20 to be joined, the fabric layers 16, 18, 20 to be joined together are fixed relative to one another in the position prior to joining their ends. Among other things, for this purpose, the material rolls 24, 26, 28, 36, 38, 40 are shifted in their axial position to each other.

In the Figures 2 and 3 are additionally two rolls of material 92, 94 shown, which are also arranged in a roll receiving, wherein it is the material rolls 92 and 94 so-called cover sheet material, which is arranged and sewn in the production of, for example, quilts or mattress tops as the top layer. In the production of quilts or mattress boards often a frequent change between these cover layer materials is required in order to be able to sew corresponding pre-planned batches of different design. Therefore, the above-described advantages of the storage device 10 according to the invention also apply to a storage device 10 with a roll receptacle for this cover layer material according to the material rolls 92 and 94. It is in the Figures 2 and 3 to recognize that these rolls of material 92 and 94 are mounted in the immediate vicinity of the sewing machine 14 in the roll receptacle 22, so that this cover sheet material is also provided in close proximity to the sewing unit. It should again be noted that all features of the roller mount 22, as used in the storage device 10 according to the Figures 2 and 3 shown and described above are also in terms of the material rolls 92 and 94 in the space provided for this purpose roll receptacle 22 may be provided immediately before the sewing machine 14. This also achieves the advantages described above in this area.

Figuren 7 bis 11

schematische Verfahrensschritte eines Nähvorgangs und zum Fadenabschneiden einer Steppstichmaschine;

Fig. 12

einen Abschnitt eines Nähguts mit einem gespannten Oberfaden in perspektivischer Ansicht;

Fig. 13

eine Schneideinrichtung zum Abschneiden von Fadenenden in perspektivischer Ansicht; und

Fig. 14

die Schneideinrichtung gemäß Fig. 13 in einer Draufsicht.

A sewing process will be described with reference to the following figures. Show it:

FIGS. 7 to 11

schematic process steps of a sewing process and thread trimming a lockstitch machine;

Fig. 12

a section of a fabric with a tensioned upper thread in perspective view;

Fig. 13

a cutting device for cutting thread ends in a perspective view; and

Fig. 14

the cutting device according to Fig. 13 in a top view.

From the FIGS. 7 to 11 is a method for sewing material to be seen 72, which is formed of two large fabric layers 16, 18 which are connected by means of an upper and a lower thread 66, 68. In the method, a needle 70 of a sewing unit not shown penetrates into the sewing material 72 with the upper thread 66. The upper thread 66 is connected to the lower thread 68, whereupon the needle 70 is withdrawn from the fabric 72 ( Fig. 7 ).

In order to separate the lower thread 68 from the sewing material 72, a cutting device 74 is arranged below the sewing material 72, that is, in the region of the surface of the sewing material 72 facing away from the needle, which cuts off the lower thread 68 (FIG. Fig. 8 ). After the lower thread 68 is cut off and a free end 78 is formed, the fabric 72 is displaced in the transport direction, whereby the upper thread 66 is tensioned such that the lower thread 68 connected to the upper thread 66 facing with its free end 78 to above one of the needle 70 Surface 76 is pulled so that the end 78 of the lower thread 68 in the region of this surface 76 is removable. The lower thread 68 is cut off before tensioning the upper thread 66 at the end of a sewing section. Alternatively, to move the sewing material 72, a tensioning of the upper thread 66 by an independent, not shown tensioning lever done ( Fig. 9 ).

The now over the surface 76 protruding free end 78 of the lower thread 68 is cut substantially flush with the surface 76. For this purpose, a cutting device 80 is provided, which will be described below ( FIGS. 13, 14 ). For example, the lower threads 68 are cut off such that their free ends 78 projecting beyond the surface 76 have a maximum length of 10 mm exhibit. The cutting off of the portion of the lower thread 68 projecting beyond the surface 76 is carried out with a flat-type cutting device 80. It is contemplated that substantially each needle 70 is associated with a cutter 80.

According to a further embodiment it is provided that also the upper thread 66 is cut when it rests on the surface 76 due to a transport of the material 72 between the end of a seam and the beginning of a following seam ( Fig. 10 ).

By means of a knife 82, the upper threads 66 running on the surface 76 and not sewn to the sewing material 72 are cut substantially centrally ( Figures 11 and 12 ).

For this purpose, the knife 82 movable transversely to the transport direction has a cutting edge 84. The cutting edge 84 is inclined relative to the surface 76 and runs at an acute angle to this. As a result, can be detected with the tip of the upper thread 66 and cut over a sliding movement over the cutting edge 84. As a result, yarn ends 86 of the upper thread 66 are generated. The thread ends 86 can then together with the thread ends 78 of the lower thread 68 in one operation by means of the cutting device 80 (FIG. FIGS. 13 and 14 ) are cut off. Optionally, the yarn ends of the lower threads and / or the upper threads are blown or sucked with air, so that a safe cutting process is given ..

Even at the beginning of a seam is provided that the lower thread 68 is pulled by means of the upper thread 66 on the needle 70 facing surface 76.

The cutting device 80 has two flat-shaped cutting plates 88, which are arranged substantially parallel to each other and slidable to each other. On one side, the two cutting plates 88 sawtooth-like projections in the form of a sawtooth profile 90, which cause in the case of displacement of the cutting plates 88 along the extension of the sawtooth 90 against each other at their adjacent edges a cutting action. The cutter 80 is used for the purpose of cutting the yarn ends 78, 86 along the surface 76 of the fabric 72. By appropriate selection of the cutting plates 88, the length of the Thread ends 76, 86 can be adjusted.

The exemplary embodiments illustrated in the figures merely serve to explain the invention and are not restrictive of it.

LIST OF REFERENCE NUMBERS

10

stocker

14

sewing machine

16

sewing material

18

sewing material

20

sewing material

22

roll cradle

24

material roll

26

material roll

28

material roll

32

stocker

34

roll cradle

36

material roll

38

material roll

40

material roll

42

holder

44

cantilever

46

axis of rotation

48

role

50

recording device

52

carriage

54

bearing surface

56

axis

58

leg

60

linear motor

62

supporting frame

64

Connecting and guiding device

66

upper thread

68

lower thread

70

needle

72

workpiece

74

cutter

76

surface

78

End of the lower thread

80

cutter

82

knife

84

cutting edge

86

End of the upper thread

88

cutting boards

90

sawtooth

92

material roll

94

material roll

Claims (15)

Storage device (32) for sewing material layers (16, 18, 20) to be sewn with a sewing machine (14), in particular a multi-needle sewing machine, of a large-area sewing material, such as mattress plates, which consists of several, in particular at least three, fabric layers (16, 18) , 20), preferably with a material layer of elastic material, such as foam, and a fabric layer as cover layer, consisting of at least one roller receptacle (34), in the at least two rolls of material (24, 26, 28, 36, 38, 40) storable are,
characterized,
in that each material roll (24, 26, 28, 36, 38, 40) is rotatably mounted in a holder (42) of the roll receptacle (34) and that of the material rolls (24, 26, 28, 36) arranged in a roll receptacle (34) , 38, 40), and the sewing unit layers (16, 18, 20) can be fed to the sewing unit alternatively from a roll receptacle (34). Storage device according to claim 1,
characterized,
in that the holders (42) of a roll receptacle (34) are essentially arranged horizontally next to one another or vertically above one another. Storage device according to claim 1,
characterized,
in that each holder (42) has at least two spaced-apart cantilevers (44) and an axis of rotation (46) extending between the cantilevers (44) for receiving a roll of material (24, 26, 28, 36, 38, 40). Storage device according to claim 1,
characterized,
in that the holder (42) is formed in a trough-like manner such that it can be adapted to the outer contour of the roll of material (24, 26, 28, 36, 38, 40). Storage device according to claim 4,
characterized,
in that the holder (42) has a friction-reducing surface which faces the roll of material (24, 26, 28, 36, 38, 40). Storage device according to claim 4,
characterized,
in that the holder (42) has a plurality of at least two rollers (48) which are rotatably mounted in the holder (42) and on which the material roll (24, 26, 28, 36, 38, 40) can be placed. Storage device according to claim 1,
characterized,
in that at least the upper holder (42) of a roller receptacle (34) has a receiving device (50) with which a roll of material (24, 26, 40) can be conveyed into the upper holder (42). Storage device according to claim 7,
characterized,
in that the receiving device (50) has a carriage (52) with a contact surface (54) which can be placed at least partially against the roll of material (24, 26, 28, 36, 38, 40) and which is displaceable relative to the holder (42) extended position movable and in an aligned with the extended position end position relative to the holder (42) is formed bendable. Storage device according to claim 8,
characterized,
in that the carriage (52) has a substantially L-shaped design in longitudinal section and a limb (58) forms a supporting abutment for the material roll (24, 26, 40). Storage device according to claim 8,
characterized,
in that the bearing surface (54) consists of a plurality of rollers (48) or rollers mounted rotatably in the carriage (52). Storage device according to claim 8,
characterized,
in that an energy store and / or a linear motor is arranged between the carriage (52) and the receiving device (50). Storage device according to claim 1,
characterized,
in that the roller receptacle (34) has a support frame (62) on which the holders (42) are formed as two cantilevered arms (44) spaced apart in the support frame (62), between which a roll of material (24, 26, 28, 36, 38, 40) is rotatably storable, wherein in the cantilever arms (44) is a rod or roller can be inserted, which rod or roller, the material roll (24, 26, 28, 36, 38, 40) passes through centrally. Storage device according to claim 1,
characterized,
in that in each case at least two holders (42) of a roller receptacle (34) are assigned a connecting and guiding device (64) for the material layers (16, 18, 20) to be pulled from the material rolls (24, 26, 28, 36, 38, 40) , Storage device according to claim 13,
characterized,
in that the connecting and guiding device (64) has two clamping devices spaced apart from one another, with which at least one material layer (16, 18, 20) can be fixed in a clamping manner. Method for feeding a material layer (16, 18, 20) from a storage device (32) to a sewing machine (14) having at least one sewing unit, in particular a multi-needle sewing machine, in which in particular at least two layers, preferably consisting of at least one layer of material made of elastic material , For example, foam, and a cover layer, large-scale sewing materials, such as Mattress panels are sewn, wherein two rolls of material (24, 26, 40) with fabric layers (16, 18, 20) in the storage device (32) in two holders (42) of a roll receptacle (34) are arranged and a first fabric layer (16, 18 20) is withdrawn from a holder (42) of the roll receptacle (34) and fed to the sewing machine (14),
characterized,
that the second, next to, above or below the first fabric layer arranged fabric layer is withdrawn as needed from the second roll of material (28, 36, 38,) in the second holder (42) of the roll receptacle (34) and the sewing machine (14) is supplied.

Images