EP1245709A2 - Automatic sewing machine with a transport device - Google Patents

Abstract

The automatic sewing machine, with at least one transport mechanism (5) for a fabric, is rigidly bonded to the fabric support table (4), with movement across the fabric advance direction (T). A drive gives the lateral movement (Q) to the fabric support table together with the transport system. The transport mechanism has rollers (5b,5b') with a rubber cladding and an intermediate roller (5a) with radial projections (13).

Description

The invention relates to an automatic sewing machine with a transport device for at least one product to be processed and one transverse to the transport direction of the product to be processed movable support table, which is preferably normal is arranged to the stitch direction of the sewing head.

Automatic sewing machines with a transport device and a support table for the sewing material are already known and belong to the general state of the art. Most these known sewing machines transport the sewing material in one direction Stitching point of the sewing machine to and from this, so that essentially one straight seam is created. Such a sewing machine with position sensors for Sewing material control can be seen, for example, from DE 4226161 C1. Furthermore are Sewing machines are known in which to form a zigzag-shaped Seam of the sewing head or the needle are movably mounted transversely to the feed direction. A device in which the sewing material moves across a wheel transversely to the feed direction is apparent from DE 4203426 A1, while in US 6 112 683 A described sewing machine a support table that is transverse to the feed direction is movable.

It has been found to be disadvantageous in the known prior art that either only one sewing material can be processed or folds as a result of the Cross-shifting can hardly be avoided.

The object of the invention is to provide a sewing machine of the type mentioned specify that enables at least one product with simultaneous feed and Machining the transverse movement while avoiding wrinkles.

According to the invention this is achieved in that the transport device and the Support table for the product to be processed are rigidly connected and essentially transverse to the direction of transport of the product to be processed are movably mounted and a drive device for moving the Support table with transport device is provided. Because the Transport device that transports the sewing material to the stitching point of the sewing machine is rigidly connected to the support table, the material can be between the Transport device and the support table are firmly clamped and so without Wrinkles can be moved transversely to the transport direction of the material. At the already known prior art, in which the support table was fixed, the Sewing material on the support table can be pushed back and forth, which in most Cases led to the formation of wrinkles.

So that the sewing material is moved evenly in the transport direction, according to one Another embodiment of the invention can be provided that the Transport device a rotatably mounted transport element and a Drive device for the transport element comprises.

If the sewing material is conventional fabrics, such as Cotton or linen fabrics, it has proven advantageous if that Transport element as a preferably circumferentially coated with rubber roller is trained. This rubber coating ensures that the fabric without to slip is transported further. In the event that finished as a sewing material Products such as tapes, chains or other individual materials are used, a further embodiment of the invention provides that the Transport element as a mold wheel, with the product to be processed interlocks, is formed.

Are such finished endless materials on material such as fabric, leather or the like sewn on, it turned out to be particularly cheap if that Transport element as a combination of a preferably circumferentially with rubber coated roller and a mold wheel is formed, with a particularly preferred embodiment, the mold wheel between two is preferably arranged with rubber-coated rollers. With such a Design of the transport element, the fabric of the two with rubber coated rollers transported while the product to be sewn from Mold pulling wheel is moved further in the transport direction. If now the drive device of the transport element is electrically controlled and the transport element at least a sensor, for example a position sensor or a Has angular position transmitter, can at any time during the sewing process feed necessary for the formation of the next stitch point can be set exactly. The transverse displacement of the item to be sewn can be processed just as precisely Set the material to be sewn when the drive device for moving the Support table including transport device is electrically controlled, the Support table and / or the transport device at least one sensor, have, for example, a position sensor or a position encoder.

If the sewing head is stationary and the needle in the sewing head is essentially normal to the plane the support table is movably arranged, the necessary feed of the Sewing material and the transverse displacement of the support table depending on the position the needle can be determined. According to a further exemplary embodiment, the Invention provided that a control device is assigned to the automatic sewing machine, the control device for comparing the actual values determined by the sensors is formed with stored target values and the Transverse movement values and / or the values for the forward transport of the sewing material passes on the respective drive device.

If two products are to be sewn together, it has to be special proven to be advantageous if the sewing machine has a guide part for feeding one processing product to the stitching point, wherein the outlet opening of the Guide part is arranged immediately before the stitch point and the guide part with the support table and / or the transport device is rigidly connected. This will achieved that the product guided in this way, which from the mold pull in Transport direction is moved, the stitch point is fed without it twisted or the like.

Furthermore, a method for sewing sewing material is to be followed predetermined stitch patterns for use in an inventive Automatic sewing machines are specified, in which in a first step the form pulling wheel a corresponding stitch program is assigned, then the support table and the Transport device can be brought into a defined starting position and over a needle position sensor after each stitch, preferably synchronously the feed of the products to be sewn and the transverse movement of the Support table including the transport device for the products to be processed to be triggered. With this method it is therefore possible that previously necessary labor-intensive sewing of fabrics and finished products automatically, i.e. much quicker and less prone to error by doing in simply the degree of shape corresponding to the products to be sewn on mounted and the control device enters the appropriate stitch program, or can the control device do this e.g. automatically using a coding plug detect.

A further development of this method according to the invention provides that the Support table and / or the transport device via an optical scanning device in a defined starting position, the optical Scanning device can be designed such that it is the scanned automatically assigns a stitch program to the product to be sewn, so that from User only the sewing material and the product to be sewn on the sewing material in Starting position must be brought. The sewing process, i.e. stitch formation, the feed of the sewing material and the product to be connected to the sewing material and the transverse displacement of the support table together with the The transport device is then carried out automatically.

Fig. 1

eine skizzenhafte Darstellung des erfindungsgemäßen Nähautomaten,

Fig. 2

eine schematische Draufsicht auf einen erfindungsgemäßen Nähautomaten,

Fig. 3

eine schematische, perspektivische Darstellung des Stichbereiches des Nähautomaten,

Fig. 4

das Ineinandergreifen des Transportelementes mit den nächtechnisch zu bearbeitenden Erzeugnissen und

Fig. 5a und Fig. 5

Ansicht und Draufsicht auf einen Niederhalter.

Further advantages and details of the invention are explained in more detail in the following description of the figures with reference to the drawings. In these shows:

Fig. 1

a sketchy representation of the sewing machine according to the invention,

Fig. 2

2 shows a schematic top view of an automatic sewing machine according to the invention,

Fig. 3

1 shows a schematic, perspective illustration of the stitch area of the automatic sewing machine,

Fig. 4

the interlocking of the transport element with the products to be machined at night and

5a and 5

View and top view of a hold-down device.

The sewing machine 1 shown in FIG. 1 has a substructure 2. On this Substructure 2 is sewing machine 7, which has a control device 8, permanently arranged. Furthermore, on this substructure 2 is a frame 3 in the direction Q, i.e. movably mounted transversely to the direction of transport. On frame 3 is on the one hand the support table 4, on the other hand, the transport device 5 arranged so that the Support table 4 and the transport device 5 are rigidly connected to each other and across a drive device (not shown) for the frame 3 in the Q direction can be moved to the transport direction. The transport element 5 moves in Direction of rotation D and in this way transports the between the Transport element 5 and the support table 4 clamped sewing material to the stitching point 10 and further.

Fig. 2 shows a plan view of how the fabric 12 and that to be sewn onto the fabric 12 Product 12a from the transport element 5 in the transport direction T by rotating the Transport element 5 are transported in the direction of rotation D and at the same time Support table 4, the transport element 5 and between the transport element 5 and the support table 4 clamped material 12 and the product to be sewn 12a across to the direction of transport T in the direction Q is moved. The substructure 2 and the In contrast to this, sewing machine 7 indicated by dashed lines are arranged in a stationary manner.

From Fig. 3 it can be seen that the support table 4 in the stitch area of the needle 9 a Has stitch opening 10 into which the needle 9 in lower areas of the lifting movement intervenes. The needle 9, which is movably mounted in the sewing head 6, follows the direction of the stitch V. The sewing head 6 in turn is arranged on the sewing machine 7. The sewing material is now from the transport element 5, the combination of two with rubber-coated Rollers 5b, 5b 'and a mold pull wheel 5a, on which radial projections 13 are arranged are, is formed, moved in the transport direction T. The transport element 5 becomes this purpose rotated in the direction of rotation D via a drive device 11. The Transverse movement of the support table 4 in the direction Q is not shown by one Drive device for the support table 4 triggered.

As shown in Fig. 4, the projections 13 of the mold wheel 5 a interlocking with the product to be sewn 12a. The sewn on Product 12a can, for example, consist of several threads 14, for example connected jewelry 12a 'exist. The product 12a is over a Guide part 14 of the stitch point (not shown) from the mold pull wheel 5a together with the material 12 is transported in the direction T, the material 12 after the stitching point and the product to be sewn on 12a is sewn together via threads 15.

To ensure the correct position of the two products 12, 12a to be sewn together guarantee, a hold-down device 16 can also be arranged, on the of which sewing parts 12, 12a facing underside a recess 17 for the Product 12a to be sewn is formed. To hold down the material 12 are further rotatable elements 19 arranged. If the hold-down device 16 with the Support table 4 or the transport device 5 rigidly connected, is one of the Line opening 10 of the support table 4 corresponding recess 18 on the hold-down device 16 arranged.

It goes without saying that the invention is not based on the listed Embodiments is limited. Rather, there are a number of variations and Modifications are conceivable with which the inventive idea can be implemented. So it would be possible, for example, to use a special one instead of the molding wheel Rubber-coated roller to use, the rubber is the shape of the the product to be sewn and in this way the one for transport produces the necessary positive connection and after the intervention in the product again takes original form, so that for all different forms of products to be sewn can be used the same degree of shape. A Another possibility is the use of optical scanning devices and in such a way that the shape of the product to be sewn is scanned and as a result one of the scanned forms of the product by the control device corresponding stitch program is generated. In any case, the invention is essential Fact that the support table is rigidly connected to the transport device and these can be moved transversely to the transport device.

Claims (13)

Automatic sewing machine with a transport device for at least one product to be processed and a support table movable transversely to the transport direction of the product to be processed, which is preferably arranged normal to the stitch direction of the sewing head, characterized in that the transport device (5) and the support table (4) for the processing product (12, 12a) are rigidly connected to one another and are mounted movably essentially transversely to the transport direction T of the product (12, 12a) to be processed, and a drive device for moving the support table (4) together with the transport device (5) is provided. Automatic sewing machine according to claim 1, characterized in that the transport device (5) comprises a transport element (5a, 5b) mounted for rotation and a drive device (11) for the transport element (5). Automatic sewing machine according to claim 2, characterized in that the transport element (5) is designed as a roller (5b, 5b ') which is preferably coated on the circumference with rubber. Automatic sewing machine according to claim 2, characterized in that the transport element (5) is designed as a mold pulling wheel (5a) which interlocks with the product (12a) to be processed. Automatic sewing machine according to one of claims 2 to 4, characterized in that the transport element (5) is designed as a combination of a roller (5b, b '), preferably circumferentially coated with rubber, and a mold pulling wheel (5a). Automatic sewing machine according to claim 5, characterized in that the mold pulling wheel (5a) is arranged between two rollers (5b, 5b '), preferably coated with rubber. Automatic sewing machine according to one of claims 1 to 6, characterized in that the drive device (11) of the transport element (5) is electrically controlled, the transport element (5) having at least one sensor, for example a position sensor or an angle of rotation position sensor. Automatic sewing machine according to one of claims 1 to 7, characterized in that the drive device for transverse movement of the support table (4) together with the transport device (5) is electrically controlled, the support table (4) and / or the transport device (5) having at least one sensor, for example have a position sensor or a position encoder. Automatic sewing machine according to one of claims 1 to 8, characterized in that the sewing head (6) is arranged in a fixed position and the needle (9) in the sewing head (6) is arranged to be movable substantially normal to the level of the support table (4). Automatic sewing machine according to one of claims 1 to 9, characterized in that the automatic sewing machine (1) is assigned a control device (8), the control device (8) being designed to compare the actual values determined by the sensors with stored target values and depending on this, the transverse movement values and / or the values for the forward transport of the sewing material (12, 12a) are passed on to the respective drive device. Automatic sewing machine according to one of claims 1 to 10, characterized in that the automatic sewing machine (1) comprises a guide part (14) for feeding a product (12a) to be processed to the stitching point, the outlet opening of the guide part (14) being arranged directly in front of the stitching point and the guide part (14) is rigidly connected to the support table (4) and / or the transport device (5). Process for sewing material to be sewn in accordance with predetermined stitch patterns for use in an automatic sewing machine according to one of claims 1 to 11, characterized in that in a first step a corresponding stitch program is assigned to the mold pulling wheel (5a), then the support table (4) and the transport device (5) be brought into a defined starting position and via a needle position sensor after each stitch, preferably synchronously the feed of the products to be machined (12, 12a) and the transverse movement of the support table (4) together with the transport device (5) for the products to be processed (12, 12a) are triggered. Method according to claim 12, characterized in that the support table (4) and / or the transport device (5) are positioned in a defined starting position via an optical scanning device.

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