KR100465423B1 - Upper feeder member bar - Google Patents

Abstract

The sewing machine is provided with an upward conveying device, a compression bar 37 accommodating a compression foot 36 on one side and a lifting bar parallel to and spaced apart from the compression bar 37 on the other side ( 51 and an upper cloth supply device 32 are connected thereto.

Description

Sewing machine with upper feeder

The present invention relates to a sewing machine having an upper transfer device.

DE-GM 1 974 416 (corresponding to US-PS 3 614 934) is known for the upper conveying device of the sewing machine, the device is provided with a cloth compression mechanism having a compression rod formed in a hollow, the compression rod The bottom part of the cloth compression mechanism, that is, the compression foot, is fixed. On a straight line, a displaceable compression rod is applied to the needle hole of the sewing machine by a tension spring. In the compression rod formed in the hollow, the lifting bar is displaceably supported by the upper fabric feed device articulated with it. An angle lever is rotatably supported by the compression rod, one lever arm of which is firmly connected to the lifting shaft by a crank drive, and the other lever arm is connected to the lifting bar. The lifting bar is loaded in the direction of the needle hole by another spring. When the upper fabric feeder is idled and is separated from the needle hole and lifted up, during this time, when the needle is sewn into the sewing portion and there is an attraction of the sewing portion, the compression foot is in the direction of the needle hole in the direction of the enlarged sewing portion due to the repulsive force. It is compressed in the direction toward. By the support of the lifting bar in the compression rods, significant friction occurs in the upper conveying device, which hinders the high-speed rotational drive of the sewing machine, thus preventing the high number of stitches per unit time.

It is known from DE 41 31 058 A1 to have an angle lever in the lifting drive to the cloth compression mechanism of the upper feeder, with one of its lever arms being in close swing with the actuating lever. By the displacement of the angle lever with respect to the swing-drive lever, the angle at which the angle lever vibrates changes, and for this reason, the lifting operation of the cloth compression mechanism changes.

An object of the present invention is to create a sewing machine having an upper feeder that can be driven with a high number of stitches.

According to the present invention, the above problem is solved by the description configuration of the feature of claim 1. Thereby, the compression rod and the lifting bar are supported irrespective of each other, so that during the upper cloth feeding operation step, that is, during the feeding step, the cloth feeding device does not exert the lateral and longitudinal forces on the compression rod of the cloth compression mechanism. The upper fabric feeder and the compression foot bottom are arranged in guide bars, i.e. lifting bars or compression rods, which are formed independently of one another.

Another advantageous embodiment is evident from the dependent claims. The details of the present invention will become apparent from the following description of the embodiments based on the drawings.

The double stitching-sealing frame 1 is supported on the table 2. The sewing machine 1 has a stand 3 extending substantially vertically, from which the lower base plate 5 of the same case shape as the case upper arm 4 extends horizontally. In other words, the sewing machine 1 has a conventional C shape. The arm shaft 6 is supported by the arm 4, and a flywheel 7 is fixed to one end thereof (outside of the stand 3). The drive of the arm shaft 6 is performed by a drive device 8 which is installed and controlled under the table 2, but the drive device basically includes a motor 9 and a control device having a clutch device and a brake device ( 10). The transmission of the driving force from the motor 9 to the flywheel 7 is performed by the V belt transmission 11.

From the arm shaft 6, the needle bar 13 supported by the front part of the arm 4 is normally moved up and down by the crank transmission device 12 (FIG. 2). Similarly, from the arm shaft 6, the rotary drive electric motor existing in the stand 3 and the base plate 5 is provided, and the looper (shuttle) 14 is provided at twice the rotation speed corresponding to the movement of the needle bar 13. Driven. The arm shaft 6 and the position sensor 15 are connected without being twisted, and the position sensor receives a signal indicating the rotational speed of the arm shaft 6 on the one hand and a signal indicating the rotational angular position of the arm shaft 6 on the other hand. The signal is transmitted to the controller 10 by the signal transmission line 16.

On the arm 4, the bobbin 17 provided with a stoke yarn is arrange | positioned, and the needle needle 18 is taken out from this. The acupuncture 18 is guided to the carcass 20 by means of the switching device 19 and from there through the sealer 21. The needle 18 from the sealer 21 passes through the thread clip 22 toward the bottom in a substantially vertical direction, and is guided to the needle 23 provided in the needle bar 13. The needle 18 passes through the needle hole 24. The needle 23 penetrates through the stitch hole 25 of the outlet plate 26 disposed above the looper 14 which is arranged substantially in line with the upper surface of the table 2 by the sewing operation. The looper tip 27 of the looper 14 which is driven by the looper drive shaft 28 is moved so as to pass through the needle 23 or its vertical path.

In the table 2, the body of the lower fabric supply device 29 used to convey the first lower sewing portion 30 in the normally driven sewing direction 31 disposed on both sides of the outlet plate 26 is shown. The lower feeder is arranged. Due to the conveyance of the sewing portion 30 in the sewing direction 31, the cloth supply device is in contact with the sewing portion 30, and subsequently performs an orbital operation downward and in reverse to the sewing direction 31, and thus again the sewing portion. Guided to 30. This sun is actually widespread.

The arm 4 is provided with an upper conveying apparatus functionally attached to the lower conveying apparatus. The apparatus is described in detail below. The apparatus has an upper cloth feeding device 32 formed in the shape of a fork disposed above the lower cloth feeding device 29. The upper fabric supply device is used to convey the second upper sewing portion 33 in the sewing direction 31. Both cloth supply devices 29 and 32 have engaging portions 34 facing the sewing portions 30 or 33 respectively. When the compression bottom portion 35 of the compression foot 36 is disposed within the range of the fork-shaped upper cloth supply device 32, and the needle 23 is stuck in the sewing portions 30 and 33 and the needle is pulled out again. Until, the bottom portion compresses both sewing portions 30, 33 in the range of the outlet plate 26. This is commonly commonly done and known in particular in the sewing art.

The compression foot 36 is supported to be displaceable in parallel with the needle bar 13 in the first shaft box 38 used as the compression bar 37. Thereby, the cloth compression mechanism 37a is formed. The compression rod 37 is loaded by a first spring 39 formed by a helical compression spring, that is, by an external spring, and the first spring is also disposed in an upper range of the arm 4 and is a twistable screw. It is supported on a zone formed as a case, that is, a positionable pedestal 40. The pedestal protrudes outwardly from the upper arm 4 clearly from FIG. 2. The compression rod 37 is supported by the stopper 41 with a first spring 39 which is capable of applying pressure in advance and adjusting its prepress. The screw case forming the adjustable pedestal 40 is penetrated by the adjusting bolt 42. The bolt is a screw portion 43, the position can be adjusted with respect to the screw case forming the pedestal (40). The adjusting bolt 42 protrudes outward from the upper arm 4 clearly from FIG. 2. In particular, as can be seen from FIG. 3, the adjusting bolt 42 again penetrates the first spring 39, and a compression rod 37 formed partially hollow in the rod-shaped portion 44. The second spring 45, in other words, the inner spring is arranged in the compression rod 37 formed in the hollow. The second spring 45 is supported by the joint footrest portion of the rod-shaped portion 44 of the adjusting bolt 42 used as the pedestal 46. At the other end thereof, an inner spring 45 capable of adjusting its preliminary pressure by the adjusting bolt 42 is supported by the bearing 47 (Fig. 4), and the compression rod 37 is displaceable with respect to the bearing. have. For this purpose, the compression rod 37 has, in its range, an elongated hole 49 extending in the displacement direction 48, the elongated hole having a play and having an axis number 47 as a stopper for the inner spring 45. It penetrates by the pin 50 fixed to (). The bearing 47 is, in short, displaceable in the downward direction 48 with respect to the compression rod 37 and is loaded towards the table 2 by a second spring, ie a second spring 45, and The load is applied with an adjustable force with the adjusting bolt 42.

The bearing 47 is fixedly attached to the second bar, that is, to the lifting bar 51 arranged parallel to the compression bar 37. The second rod is displaceably disposed in the downward direction 48 in the same shape in the second shaft box 52. In particular, as can be seen from FIG. 2, the second shaft box 52 is also fixedly mounted on the arm 4. The inner spring 45 thus directly loads the lifting bar 51 in the downward direction 48.

The cloth supply device 32 is provided by a lifting drive device 53 which is used for the compression of the upper cloth supply device 32 to the upper sewing portion 33 and for lifting therefrom, and the upper sewing portion ( It is driven by a slide drive 54 which is used for conveying 33 and for the return operation of the cloth supply device 32. The upper cloth supply device 32 is fixedly provided with two crossbar levers 55 for this purpose. A lifting-compression foot-connection plate 56 is fixed to the lever by a pivot joint 57. The connecting plate 56 is installed in the bearing 47 by another pivot joint 58, which extends substantially in the downward direction 48 of the bearing 47 in the direction of the table 2 (FIG. 2). And FIG. 4). At the end of the two cross lever levers 55 opposite the cloth feeder 32, two separate cross lever levers 59 are hinged and fixed by the pivot joint 60. The two crossbar levers 59 are pivotally supported by a stationary shaft 61 in its intermediate region. By being adjustable by the set screw 62 formed of two parts, the two crossbar levers 59 can be length-adjusted between the joint 60 and the bearing 61. This makes it possible to adjust the parallelism between the upper cloth supply device 32 and the table 2.

At the ends of the two cross lever levers 59 located opposite to the joint 60, the swing lever 63 is hinged by the joint 64. The pivot lever 63 is driven by a slide shaft 65 that is formed as a hollow shaft and is capable of being driven in a pivoting motion. As a result, the two crossbar levers 59 are also pivotally driven in rotation of the shaft 61. It is thus likewise possible to carry out the forward and backward transfer operation in which the upper cloth supply device 32 is substantially parallel to the table as already described. The slide shaft 65 formed as the hollow shaft is rotatably supported by the bearing 66 in the arm 4 (see FIG. 5). The slide lever 65 and the two lever levers 55 and the two lever levers 55 jointly form the slide shaft 65 and the slide drive device 54 substantially.

The bearing part piece 67 whose outer side forms the stopper 41 for the outer spring 39 is fixed to the compression rod 37 above the 1st shaft box 38. Between the compression rod 37 and the lifting bar 51, the angle lever 68 is rotatably supported by the joint 69 on the bearing part piece 67. As shown in FIG. The lever has two lever arms 70 and 71. A pivotal driving lever 72 driven by a lifting shaft 73 is in contact with one lever arm 70, and the lifting shaft is disposed on a slide shaft 65 formed as a hollow shaft, and the slide shaft 65 and Together with the common axis 74. One lever arm 70 faces the direction of the axis 74 substantially. The other lever arm 71 of the angle lever 68 is in contact with the configuration surface formed by the roller 75 of the lifting bar 51. Here, the roller 75 is provided in the lifting ratio 51 above the 2nd shaft box 52 in the vicinity of the bearing part piece 67.

The driving of the lifting shaft 73 is carried out by means of a practical ordinary ordinary lifting motor 76 shown in FIGS. 6 and 7. The device is formed as a joint transmission. Here, the crank 78 which is firmly connected with the lifting shaft 73 is driven by the compression 6 in which the eccentric shaft 77 is fitted. The crank pivots the lifting shaft 73 by a predetermined angle around the axis 74 at the time of rotation of the female shaft 6. The swinging motion of the lifting shaft 73, and hence the swinging motion of the swinging drive 72, is constant. The pivotal drive outside the slide shaft 65 formed as the hollow shaft is performed by the generally known practical ordinary slide transmission apparatus 79 shown in FIGS. 7 and 8. The device is formed as a joint transmission device that can be adjusted between driving of the sewing machine 1. Thereby, the eccentric shaft 80 hinged to the two cross levers 81 by the joint 82 is driven by the female shaft 6. The lever arm 83 of the lever 81 is hinged and fixed to the crank 84 firmly connected to the slide shaft 65 formed as the hollow shaft. The other lever arm 85 of the lever 81 is hinged to the sliding pad 86 supported in the recess 87 of the adjustment shaft 89 which is rotatable around the axis 88. Rotation around the axis 88 of the adjustment shaft 89 causes the sliding pad 86 to be displaced back and forth between the full rotation of the arm shaft 6 and, accordingly, between the longitudinal movements of the eccentric shaft 80. Changes. In this way, the angle at which the slide shaft 65 is shaken and pulled between the rotations of the arm shaft 6 is changed accordingly. Correspondingly, the conveying path to be returned from the cloth supply device 32 which meshes with the upper sewing portion 33 and thus the conveying of the sewing portion 33 are adjusted.

The entire joint is pivotable around an axis extending parallel to the axis 74. The operation of the upper feeder described in detail is described in detail below on the basis of the schematic diagram in FIG. 9. The compression foot 36 constantly compresses the sewing portions 30 and 33 overlapping the outlet plate 26 in the downward direction 48. While sewing while forming the sewing portion, the transfer of the sewing portions 30, 33 according to the cloth feeding devices 29 to 32 is not performed. These cloth supply devices are rather removed (lifted up or down) from the sewing portions 30, 33 and are in an idle operation in a direction opposite to the sewing direction 31. During the idle operation, the swing lever 63 is driven (counterclockwise in FIGS. 2 and 9) by the slide shaft 65 formed as the hollow shaft, and the angle lever 68 is also turned clockwise, The lifting bar 51 is thus lifted in the opposite direction to the downward direction 48, and the two crossbar levers 55 connected with the lifting bar compression foot connecting plate 56 together with the upper fabric feed device 32. Lifted from sewing parts 30,33. Since the lifting bar 51 is connected to the bearing 47 and is supported by the second spring 45, the lifting of the lifting bar 51 and the upper cloth supply device 32 is dependent on the force of the second spring 45. Will be opposed. Since the angle rubber 68 is supported in contact with the compression rod 37 holding the compression foot 36, the compression foot 36 is not only (always constant) by the first spring 39, but also additionally. The second spring 45 also compresses the sewing portions 30 and 33 in the direction of the table 2. During the step of not being conveyed, the compression force of the compression foot 36 to the sewing parts 30 and 33 is increased and acted as a result of which the needle 23 is pulled out, that is, the needle 23 is pulled from the sewing parts 30 and 33. During extrusion, it is of particular significance that the increased force acts on the sewing portions 30, 33 and is compressed on the outlet plate 26.

When the needle 23 returns from the sewing portions 30 and 33 to the position specified in FIG. 2, the upper cloth supply device 32 is again placed on the sewing portions 30 and 33. Due to this, the pivot drive lever 72 is pivoted (clockwise in FIGS. 2 and 9) by the lifting shaft 73, whereby the pivot lever 68 is pivotable so that the angle lever 68 returns back clockwise. The lifting bar 51 is then displaced in the downward direction 48 by the force of the second spring 45 together with the angle lever 68, so that the upper cloth supply device 32 is again the upper sewing portion 33. Will be placed). The lower fabric supply device 29 is in contact with the lower sewing portion 30 from the bottom at the same time. The force on which the upper cloth supply device 32 is compressed to the upper sewing portion 33 is matched to the pretension of the second spring 45. The cloth compression mechanism 37a at this time, the burden is reduced by the force that the upper cloth supply device 32 is compressed to the sewing portion (30). Thus, the upper cloth supply device 32 is displaced in the direction 31 and conveys the upper sewing portion 33. At the same time, the lower fabric supply device 29 conveys the lower sewing portion 30, wherein the transport operation of the upper fabric supply device 32 (as already mentioned) may be larger than the lower fabric supply device 29. . Due to the conveying operation of the upper cloth supply device 32, the pivot lever 63 is pivoted (as opposed to clockwise in FIGS. 2 and 9) by the slide shaft 65, and thus the upper cloth supply device 32 Is displaced in the sewing direction 31 (to the left in FIGS. 2 and 9). At the end of the transfer operation, two crossbar levers 55 are lifted together with the upper cloth supply device 32 as already described above.

Between the conveying operations of the upper cloth feeder 32, the upper cloth feeder does not exert a longitudinal force in the direction of displacement 48 on the compression rod 37 which holds the compression foot 36. As shown in FIG. This reduces the burden on the original sewing by the compression foot 36, but has a good effect on entering from a viewpoint farther than the upper sewing portion 32. During the idle operation of the upper cloth supply device 32, the lifting drive device 53 exerts a longitudinal force acting in the displacement direction 48 on the compression rod 37 holding the compression foot 36, and the sewing portion. The force holding (30, 33) is increased. Since the compression foot 36 is constantly placed on the sewing parts 30 and 33, the spacing between the compression bottom 35 and the outlet plate 25 is increased with increasing thicknesses of the sewing parts 30 and 33. This results in a corresponding lifting of the bearing portion 67 with the angle lever 68. The distance a between the working points 72a of the pivotal driving lever 72 in contact with the lever arm 70 of the angle lever 68 from the axis 69a of the joint 69 of the angle lever 68 is the sewing portion 30. , 33) decreases with increasing thickness. The smaller the interval a is, the larger the stroke of the angle lever 68 is despite the constant stroke of the swing drive device 72. In short, in the case of the thick sewing parts 30 and 33, the lifting operation of the upper cloth supply device 32 is increased. Here, since the lifting of the upper cloth supply device 32 (as already described above) is increased by the lifting of the bearing portion 67, the thick sewing portions 30, 33 can also be processed without problems.

The upper cloth supply device 32 and the supply device 36 are arranged on guide rods that are independent of each other, that is, on the lifting rod 51 and the compression rod 37. As a result, the correlation between the cloth compression mechanism and the cloth supply device 32 is reduced. The upper feeder has only a pivot joint on the outside of the arm 4. The upper conveying device is therefore lubricated technically controlled by the use of suitable bearing material, that is to say that the upper conveying device requires little maintenance for that reason and is again usable for high-speed sewing with more than 4000 stitches per minute. .

1 is a front view of the sewing machine,

2 is an enlarged cross-sectional view showing the inside of the sewing machine corresponding to the arrow II direction of FIG.

FIG. 3 is an enlarged partial view showing again the inside of FIG.

4 is a partial plan view of FIG. 2 corresponding to cutting line IV-IV,

FIG. 5 is a partial view of a sewing machine, partially showing an enlarged view of FIG. 1;

6 is a cross-sectional view of the reciprocating drive device corresponding to the cutting line VI-VI in FIGS. 1 and 7;

7 is a cut-away view of the sewing machine corresponding to the VII direction of FIG.

8 is a cross-sectional view of the slide drive corresponding to the cutting lines VIII-VIII in FIGS. 1 and 7;

9 is a schematic diagram of the propulsion motion corresponding to FIG. 2.

Explanation of symbols on the main parts of the drawings

4 upper arm 5 base plate

6: axis axis 23: needle

25: needle hole 32: cloth supply device

36: compression foot 37: compression rod

45: inner spring 51: lifting bar

Claims (7)

Upper arm 4; A rotatable arm shaft 6 disposed on the upper arm 4; A needle bar 13 movably supported by the upper arm 4 and driven by the arm shaft 6 and holding the needle 23; A base plate 5; A stitch hole 25 penetrating by a needle 23 disposed on the base plate 5; In the sewing machine having an upper transfer device disposed on the upper arm (4), The upper conveying device is supported so as to be linearly displaceable in the downward direction 48 and the reverse direction thereof, so that the upper conveying device loads the load in the downward direction 48, that is, the direction toward the stitch hole 25 by the elastic force of the first spring 39. An upper cloth compression mechanism 37a having a receiving compression rod 37 and a compression foot 36 connected to the stitch hole 25 and installed in the compression rod 37; An upper cloth supply device 32; A lifting driving device (53) for the upper cloth supply device (32) having a pivotable lifting shaft (73) and a lifting drive connection portion for connecting a lifting bar (51) to the lifting shaft (73); And a slide driving device (54) for the upper cloth feeding device (32) having a pivotable slide shaft (65) and a slide driving connecting portion for connecting the upper cloth feeding device (32) to the slide shaft (65). The lifting bar 53 is again supported to be linearly displaceable in parallel with the compression rods arranged at intervals next to the compression rods 37, and is connected to the upper cloth supply device 32 by a lifting bar ( 51, the lifting bar 51 is loaded in the direction toward the needle hole 25 by the elastic force of the second spring 45, the lifting drive connecting portion is supported by the compression rod 37, downward In contrast to the direction 48, when the lifting bar 51 is lifted, it is characterized in that the compression rod 37 is loaded by the elastic force of the second spring 45 in the direction toward the stitch hole 25. Sewing machine. The method of claim 1, Sewing machine, characterized in that the elastic force of the second spring (45) in the compression rod (37) acts on the bearing (47) that is firmly connected to the lifting bar (51). The method of claim 2, The compression rod (37) is at least partly hollow so that the second spring (45) disposed in the compression rod (37) is supported by the bearing (47) at the first end. The method of claim 3, wherein Sewing machine, characterized in that the second spring (45) is supported at the second end, the adjustment bolt (42) protruding outward from the upper arm (4). The method of claim 1, The lifting drive connecting portion includes an angle lever having a first lever arm 70 and a second lever arm 71 supported on the compression rod 37 so as to be rotatable about an axis line 69a. The lever arm 70 is connected with the lifting shaft 73 to operate together with the turning drive lever 72 in contact with the first lever arm at the operating point 72a, and is compressed from the needle hole 25 so as to be separated from the needle hole 25. And (a) the gap a of the operating point 72a from the axis 69a is reduced, and the second lever arm 71 is engaged with the lifting bar 51. The method of claim 1, Sewing machine characterized in that the lifting shaft (73) and the slide shaft (65) are arranged concentrically with each other. The method of claim 1, The first spring (39) is supported on the compression rod (37) on one side and on the base (40) protruding outwardly from the upper arm (4) so as to be mutually adjustable with the upper arm (4) on the other side. Sewing machine.