KR20080066567A - Automatic sewing machine - Google Patents

Abstract

An automatic sewing machine is provided to process different kinds of work materials rapidly and to maintain the stability during the process simultaneously. A sewing member(14) includes a working subject support member(4). A loading/preparing member(7) arranges two working subjects(2,3) to the relative sewing positions to each other. A sewing unit(15) sews two working subjects together. The first transfer unit fixes two working subjects, moves the subjects from the loading/preparing member to the sewing member with the transfer speed. The first transfer unit moves the two working subjects by the sewing speed during the sewing work. A loading member(19) receives the sewn working subjects. The second transfer unit(18) moves the two working subjects from the sewing member to the loading member by the different transfer speeds. A transfer sub unit(16b) of the first transfer unit maintains the relative sewing position during the motion of two working subjects. A driving motor moves at least one between the transfer sub unit and the second transfer unit. The transfer speed is above 10 times compared to the sewing speed.

Description

Automatic sewing machine {AUTOMATIC SEWING MACHINE}

The present invention relates to an automatic sewing machine for automatically sewing a first workpiece to a second workpiece.

Such automatic sewing machines are generally used. Examples of such automatic sewing machines include 2110/4, 2111/4, 2112/4 and 2211/4 type sewing machines of Beisler Co., Ltd., Hosbach, Germany. These automatic sewing machines are designed to sew together different kinds of workpiece pairs, in which one identical pair of workpieces may comprise workpieces of completely different sizes or different workpiece pairs may comprise workpieces of completely different sizes. Examples of such work pairs are pocket bags / pocket facings and the front part / ply of the pants. The workpiece also has different requirements, in particular in terms of weight, of being transferred through the automatic sewing machine by the two transfer units. These different requirements reduce the processing speed undesirably or require significant technical effort in the design of the transfer unit.

Automatic sewing machines of the general kind are known from DE 90 02 008 U1. An automatic sewing machine with two stepper motors for moving the workpiece support is known from DE 197 12 421 C1.

It is an object of the present invention to provide an automatic sewing machine of the above-mentioned kind which can sew different kinds of workpiece pairs together at a high processing speed and at the same time maintain high processing stability.

This object is achieved by the automatic sewing machine of the present invention for automatically sewing the first workpiece to the second workpiece, and the automatic sewing machine is a workpiece support, a loading / preparation portion for arranging two workpieces in a relative sewing position with respect to each other. The sewing part includes a sewing machine for sewing two workpieces together. The two workpieces in the relative sewing position are fixed and the workpieces are moved from the loading / preparation part to the sewing part at a feed rate. A first conveying unit for moving the two workpieces at a sewing speed, a loading portion receiving the workpiece sewn together, and a second conveying unit for moving the two workpieces from the sewing portion to the loading portion at different conveying speeds; Features of the sewing machine include the movement of the transfer subunit of the first transfer unit and / or the second to maintain the relative sewing position during the movement of the two workpieces by the first transfer unit. To move the sewing speed on the other hand due to the driving motion of the motor transmission unit, on the other hand is made by a drive motor, which is designed to be performed at the feed rate the feed rate is that it is less than 10 times the sewing speed.

According to the present invention it has been found that an automatic sewing machine can optimally adapt to different conveying requirements of different workpiece pairs through the use of a drive motor capable of carrying out a defined feed movement on the one hand at the sewing speed and on the other hand at the conveying speed. This allows the workpieces to be sewn together at high processing speeds while maintaining high processing stability. In the known automatic sewing machines, the feed movement on the one hand on the sewing speed and on the other on the feed speed has always been performed by two separate drives, resulting in higher driving effort. Instead of two separate drivers, the present invention uses a driver that can provide motion at both sewing speed and feed speed.

The stepper motor of the above-mentioned automatic sewing machine that can be used as a drive motor provides a predetermined drive movement. By the number of steps, the position of each of the conveying unit or the conveying subunit can be accurately known and thus no intermediate initialization (if necessary) of the position of the conveying unit or the conveying subunit is necessary.

The common carrier of the above-described type of automatic sewing machine to which the transfer subunit and the second transfer subunit can be connected reduces the technical effort on the design of the automatic sewing machine. Thus the movement of the conveying subunit and the second conveying unit can be effected by one and the same driver.

The use of toothed belts to transfer forces from a drive motor to a transfer subunit and / or a second transfer unit in an automatic sewing machine of the kind described above provides a safe driver with rigidity.

The controllable lifting pins of the above-described automatic sewing machines of the above-described type, which are disposed in the conveying subunit and / or the second conveying unit and which are movable between the operating position lowered by the workpiece support injury and the resting position separated from the workpiece support, are smooth. And at the same time found to be particularly suitable for safe workpiece movement.

Multiple lifting pins (at least two lifting pins can be arranged in the conveying subunit and at least three lifting pins can be arranged in the second conveying unit) of the above-mentioned automatic sewing machine of the kind described above and at least three lifting pins and the workpiece in the operating position The points of contact of the supports are not in line with each other and define the vertices of the triangle), on the one hand, well suited to the function of the conveying subunit and on the other hand to the function of the second conveying unit. The triangular arrangement of the lifting pins of the second conveying unit of the automatic sewing machine of the above-described type, in which the points of contact with the workpiece support in the operating position are not in line with each other and define the vertices of the triangle, allows larger workpieces from the sewing position to the loading position. It ensures that you can move safely.

The programmable control unit for the drive motor of the automatic sewing machine of the kind described above can variously program different movement sequences to suit the requirements of each automated sewing procedure.

Embodiments of the above-described type of automatic sewing machine, in which the lifting pins can be signal connected to the programmable control unit, can in particular adjust the contact pressure of the lifting pins. For this purpose the control unit is in particular connected to a proportional valve for regulating contact pressure. Proportional valves may be eliminated if control pressure is not required.

Exemplary embodiments of the invention are described in detail below with reference to the drawings.

The automatic sewing machine 1 is used to automatically sew the first workpiece 2 (eg pocket bag) to the second workpiece 3 (eg pocket facing). This automatic sewing machine 1 has a workpiece support 4 which receives two workpieces 2, 3 to be sewn together. This workpiece support 4 has a sliding plate 5 having a plurality of vacuum bores 6 (see also FIG. 5). The vacuum bore is connected with a vacuum source for detachably securing the workpieces 2, 3 to the workpiece support 4.

The loading / preparation part 7 of the automatic sewing machine 1 serves to arrange the two workpieces 2, 3 in a sewing position with respect to each other as shown in FIG. This loading / preparation portion 7 has a feed table 8 on which the workpieces 2, 3 are stacked. In addition, the loading / preparation part 7 is provided with several position markings on the sliding plate 5, which can be used to align the first workpiece 2 on the sliding plate 5. have. The loading / preparation portion 7 also includes a loading unit 10 for the second workpiece 3. This loading unit 10 has a stop bar 11 and a second workpiece can be arranged with respect to this stop bar. The loading unit 10 also has two spaced notched knives 12. If necessary, this notching knife can cut the edge around the seam of the seam for sewing the two workpieces 2,3 together.

Although not shown in the drawing, the loading / preparation portion 7 also includes a folding portion, which shows the second workpiece 3 supported on the stop bar 11 of the loading unit 10 as shown in FIG. 1. To the relative sewing position for the same first workpiece (2). In this relative sewing position the second workpiece 3 is arranged on the first workpiece 2 such that the two workpieces are aligned with each other with respect to a part 13 of the edge contour of the first workpiece 2.

Figure 1 shows the Cartesian x-y-z coordinate system, which represents the relative position and direction of motion. The x-direction is the direction entering into the plane of FIG. 1 in the vertical direction. The y-direction is the direction pointing left in FIG. 1 and the z-direction is the direction pointing upward in FIG. 1.

A sewing portion 14 provided with a sewing machine 15 designed in a conventional manner is used to sew the two workpieces 2, 3 together.

The first conveying units 16, 16a, 16b of the automatic sewing machine 1 are used to fix the two workpieces 2, 3 and also move them from the loading / preparation part 7 to the sewing part 14, and this movement Occurs while the two workpieces are in the sewing position relative to each other. This movement takes place at the feed rate. Furthermore, the first transfer unit 16 is used to move the two workpieces 2 and 3 at the sewing speed in the sewing process made in the sewing unit 14 while maintaining the workpieces 2 and 3 in the relative sewing positions. . The first transfer unit 16 has a fixed unit 16a designed in a known manner. During the special sewing procedure of the automatic sewing machine 1, the first transfer unit 16 also includes a transfer subunit 16b. This transport subunit is part of the transport module 17, which is shown in its entirety in FIGS. 2, 3. In addition to the conveying subunit 16b, the conveying module 17 is also provided with a second conveying unit 18. This conveying unit 18 serves to move the two workpieces 2 and 3 sewn together in the sewing section 14 from the sewing section 14 to the loading section 19 of the automatic sewing machine 1 at different conveying speeds. Do it. This stack 19 is provided with a sliding table 20 that can move in the y-direction and a lifting table 21 that can move in the x-direction (see FIG. 7).

The conveying subunit 16b comprises two lifting pins 22 screwed to two lifting cylinders 24 via a connecting plate 23. The lifting cylinder 24 allows the lifting pin 22 to make a lifting movement in the x-direction. The distance between the two lifting pins 22 in the z-direction can be defined and fixed by the long hole 25 in the connecting plate 23. The two lifting cylinders 24 of the conveying subunit 16b are screwed to the fixed angle 26. This fixed angle 26 is a common carrier for the transfer subunit 16b and the second transfer unit 18.

The second conveying unit 18 comprises three lifting pins, of which two lifting pins 27 are fixed angle via the connecting plate 23 and the two lifting cylinders 24 in the same way as the lifting pins 22. It is attached to (26) but is offset in the positive z-direction compared to the lifting pin 22 of the transport subunit 16b. The connecting plate 23 of the lifting pin 27 has a blower tube 28. This blower is designed to blow air systematically into the workpiece (2, 3) when the lifting pin, in particular the lifting pin (27) is raised and dropped to prevent unwanted sticking between the workpiece (2, 3) and the lifting pin, or It serves to remove. In addition to the two lifting pins 27, the second transport unit 18 also includes a third lifting pin 29. This third lifting pin is attached to the extension plate 30 which is screwed to the connecting plate 23. This extension plate 30 extends diagonally in both the y-direction and the z-direction so that the contact points of the two lifting pins 27 and the third lifting pins 29 define the vertices of the triangle.

Each lifting pin 22, 27, 29 can be moved between the operating position lowered on the workpiece support 4 by the lifting cylinder 24 and the resting position away from the workpiece support 4.

The fixed angle 26 is installed in the carriage 31 of the linear guide 32. This linear guide 32 causes the displacement of the carriage 31 while guiding it in the z-direction. The carriage 31 is driven by a drive motor 33 which is a stepper motor. Although not shown, the stepper motor 33 and the lifting cylinder 24 are controlled by the central controller of the automatic sewing machine 1. This central control or control unit is programmable. The transfer of force from the stepper motor 33 to the carriage 31 is effected by a toothed belt 34. This toothed belt 34 is guided along the return roller 35 (only one of which is shown in the figure) and this return roller 35 is rotated about an axis parallel to the x-axis. The return roller 35 is installed in the linear driver 32.

The reference switch 36 is arranged on the motor side of the linear guide 32. This reference switch 36 serves to initialize the z-position of the carriage 31 in the linear guide 32.

The linear guide 32 is installed in the support frame 37 supported by the frame of the automatic sewing machine 1.

The following describes the function of the transfer module 17 in relation to the first automatic sewing process in which the pocket bag 2 is sewn to the pocket facing 3. 1 shows the instantaneous position when two workpieces 2, 3 are in relative position with respect to each other. 4 shows the situation in which the fixing unit 16a is lowered to the receiving position to press the workpiece 3 firmly against the workpiece 2 and to keep the two workpieces 2, 3 relative to each other during the next movement. Shows. 5 shows the instantaneous position at which two workpieces 2, 3 are sewn together by the sewing machine 15. The transfer module 17 remains in an inactive state until the sewing process is completed. As soon as the sewing process is completed, the lifting cylinder 24 of the second transfer unit 18 in the z-position of the second transfer unit 18 shown in FIG. 5 is activated and accordingly the second transfer unit 18 Of the lifting pins 27, 29 are lowered from the rest position to the working position, ie onto the sewing work 2, 3 together. The fixing unit 16a now rises off the workpieces 2, 3. The second conveying unit 18 is driven by the stepper motor 33 and moves to the programmed z-position on the sliding table 20 (this position is shown in FIG. 6) at a feed rate relatively fast relative to the sewing speed. Done. The sliding table 20 then moves in the negative y-direction so that the workpieces 2 and 3 sewn together are separated from the lifting pins 27 and 29 in the positive x-direction and onto the lifting table 21. Will fall. This is shown in FIG. 7. The lifting pins 27, 29 of the second transfer unit 18 now return to the rest position and the second transfer unit 18 driven by the stepper motor 33 returns to the initial position of FIG. 1 even at a high feed rate. Done. At the same time the sliding table 20 moves in the positive y-direction to return to the initial position of FIG.

The transfer subunit 16b of the transfer module 17 is kept in an inoperative state during this automatic sewing process. Since the conveying subunit 16b is firmly connected to the second conveying unit 18 by the fixed angle 26, it moves only with the second conveying unit 18 passively during the sewing process.

When the second transfer unit 18 and the sliding table 20 return to their initial positions, the instantaneous position of the automatic sewing machine 1 according to FIG. 8 is reached. Now you can start a new sewing process. Of course, it is also possible to carry out the sewing process in an overlapping manner, loading the new workpieces 2, 3 while still processing the previously loaded workpieces 2, 3 at the sewing portion 14.

Next, a second automatic sewing process for sewing the first workpiece 2 in the form of the front part of the pants and the second workpiece 3 in the fly form will be described with reference to FIGS. 9 to 12.

9 also shows the position where the two workpieces 2, 3 are in relative sewing positions relative to one another. The front part 2 of the pants was positioned by means of a laser line 28 which was lighted on the sliding plate 5 and parallel to the z-direction. The upper notching knife 12 shown in FIG. 9 cuts the edges of the workpiece 3 before the workpiece 3 is transferred to the fold (not shown) of the loading / preparation portion 7. Correspondingly, the notching knife 39 cuts the edge of the first workpiece 2 in the same z-position, so that the cuts of the two workpieces 2, 3 are placed up and down at the relative sewing position. The workpiece support 4 has a total of two such notching knives 39 arranged at the same height as the two notching knives 12.

When placing the two workpieces 2, 3 with respect to each other (see Fig. 9), the fixing unit 16a moves to the receiving position to fix the two workpieces 2, 3 at the relative sewing positions. At the same time the lifting pin 22 of the conveying subunit 16b is lowered onto the first workpiece 2. The first conveying unit 16, i.e. the fixing unit 16a, together with the conveying subunit 16b loads the two workpieces 2, 3 in the relative sewing position from the loading / preparing section 7 to the sewing section 14; Will be moved to. In this process, the two units 16a, 16b of the first transfer unit 16 move synchronously. This synchronous movement takes place at a high feed rate.

During this displacement movement, the first workpiece (2) is caught by the lifting pin 22 (this lifting pin 22 is guided in the positive z-direction) of the transport subunit 16b. ) Is prevented from being pulled out of the fixing unit 16a because of its weight or inertia when it is accelerated at a high feed rate in the stationary sewing position. The transport subunit 16b thus serves to maintain the relative sewing position when the two workpieces 2, 3 are moved by the first transport unit 16. 10 shows the state in which the lifting pin 22 has just descended onto the first workpiece 2 before it is accelerated at a high feed rate.

11 shows a situation in which two workpieces 2, 3 are sewn together by a sewing machine 15. In the sewing process, the two units 16a and 16b of the first transfer unit 16 move synchronously in the z-direction at a sewing speed that is reduced by 10 factors compared to the transfer speed. It is ensured that the first workpiece 2 is not dragged out of the fixing unit 16a in the sewing process. Moreover, due to the synchronous movement of the conveying subunit 16b and the stationary unit a high quality and correctly positioned seam can be obtained for sewing the two workpieces 2, 3 together. Both the start and end points of the seam will follow a programmed procedure controlled by a central control.

Upon completion of the sewing process, the lifting cylinder 24 of the conveying subunit 16b is operated to lift the lifting pin 22 up and away from the first workpiece 2. In addition, the fixing unit 16a is also disengaged from the workpieces 2 and 3. Workpieces 2 and 3 sewn together are called out by an air nozzle (not shown in the drawing), which air nozzles (2, 3) are placed at the sewing section 14 at the place of loading or loading (19). Performs the function of the second transfer unit to move to.

When the workpieces 2 and 3 are called out, the transfer module 17 returns to the initial position of FIG. The loading / preparation part 7 is now ready to thread the other two workpieces 2, 3 and of course, during the second automatic sewing process, ie when the next sewing process step in the automatic sewing machine 1 is in progress. Can be.

In the above-described second automatic sewing process, the second conveying unit 18 is kept in an inoperative state and only moves with the conveying subunit 16b passively during the sewing process.

In the aforementioned first automatic sewing process, the transfer module 17 performs a function of a second transfer unit for moving two workpieces from the sewing unit 14 to the loading unit 19. In the second automatic sewing process, the transfer module ( 17) acts as a partial unit of the first transfer unit 16 to move the two workpieces 2, 3 in the relative sewing position from the loading / preparation section 7 to the sewing section 14. The movement of the transfer module 17 in the first sewing process is performed at the feed rate, which is more than 10 times the movement when sewing at the sewing speed during the second sewing process. The feed speed is approximately 1 m / s and the sewing speed is approximately 5-7 cm / s. These different speeds of movement are given by the drive motor 33.

Above all, the control device also actuates the lifting cylinder 24 to adjust the contact pressure at the operating positions of the lifting pins 22, 27, 29.

1 is a plan view of an automatic sewing machine according to the present invention when two workpieces to be sewn together are in a relative sewing position with respect to each other.

Figure 2 is an upward perspective view of the transfer module of the automatic sewing machine according to the present invention, showing the transfer subunit and the second transfer unit of the first transfer unit.

3 is another upward perspective view of the transfer module according to FIG. 2.

4 is a view similar to that of FIG. 1 of an automatic sewing machine at another instant position performing the first sewing process, in which the workpieces positioned relative to each other are fixed by the fixing unit and moved to the sewing unit.

5 is a view similar to FIG. 1 of the automatic sewing machine in the instant sewing position.

6 is a view similar to that of FIG. 1 of the automatic sewing machine in the instant position when loading two workpieces sewn together;

FIG. 7 is a view similar to that of FIG. 1 of an automatic sewing machine in different momentary positions when loading two workpieces sewn together;

8 is a view similar to that of FIG. 1 of an automatic sewing machine when loading two workpieces sewn together.

9, 10, 11 and 12 are views similar to those of Fig. 1 of an automatic sewing machine when performing a second sewing process with another workpiece to be sewn together.

    * Description of the symbols for the main parts of the drawings *

1: automatic sewing machine 2, 3: first, second workpiece

4: workpiece support 7: loading / preparation

14: sewing unit 15: sewing machine

16: first transfer unit 18: second transfer unit

19: loading part 33: drive motor

Claims (9)

As an automatic sewing machine 1 for automatically sewing a first workpiece 2 to a second workpiece 3, Workpiece support (4), Loading / preparation (7) for positioning two workpieces (2, 3) in a relative sewing position relative to each other, A sewing portion 14 comprising a sewing machine 15 for sewing two workpieces 2, 3 together, The two workpieces (2, 3) at the relative sewing positions are fixed and the workpieces are moved from the loading / preparation section (7) to the sewing section (14) at the feed rate, and the two workpieces during the sewing process at the relative sewing positions. A first transfer unit 16 for moving (2, 3) at a sewing speed, A loading unit 19 which receives the workpieces 2 and 3 sewn together, and a second transfer unit for moving the two workpieces 2 and 3 from the sewing unit 14 to the loading unit 19 at different feed rates. In the automatic sewing machine (1) comprising (18), Transfer unit A transfer subunit 16b of the first transfer unit 16 which maintains the relative sewing position during the movement of the two workpieces 2, 3 by the first transfer unit 16, A drive motor 33 is provided for moving at least one of the second transfer units 18, The drive motor 33 is designed such that the movement by the drive motor 33 is performed on the one hand at the sewing speed and at the other hand on the other hand, and the feed speed is at least 10 times the sewing speed. Sewing machine. 2. Automatic sewing machine according to claim 1, wherein the drive motor (33) is a step motor. 2. Automatic sewing machine according to claim 1, characterized in that the conveying subunit (16b) and the second conveying unit (18) are connected to a common carrier (26). 4. Automatic sewing machine according to claim 3, comprising a toothed belt (34) for transmitting a force from the drive motor (33) to at least one of the conveying subunit (16b) and the second conveying unit (18). 5. At least one of the conveying subunit 16b and the second conveying unit 18 is provided with at least one operable lifting pin 22, 27, 29, which lifting workpiece support 4. An automatic sewing machine characterized in that it can move between an operating position lowered upwardly and a resting position separated from the workpiece support (4). 6. Automatic sewing machine according to claim 5, characterized in that the conveying subunit (16b) is provided with two or more lifting pins. 7. The second conveying unit 18 is provided with at least three lifting pins 27, 29, in which the contact points of these pins and the workpiece support 4 in the operating position are not in line with each other and are triangular. Automatic sewing machine characterized in that to define the vertex. 8. Automatic sewing machine according to claim 7, characterized in that it comprises a programmable control unit for the drive motor (33). 9. Automatic sewing machine according to claim 8, characterized in that the lifting pin (22, 27, 29) is signal connected to the programmable control unit.

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