KR20140002775U - Sewing machine - Google Patents

Abstract

The sewing machine has a transfer unit (14) for transferring the fabric intermittently. The transfer unit 14 comprises at least one upper conveyor 15 and at least one lower conveyor 16, 17 which make intermittent friction transfer contact with the upper or lower side of the fabric, respectively. The conveying lengths of the conveyors 15 and 16 can be modified by mechanical upper conveying and lower conveying controlling devices. These regulating devices are regulated by the regulating drive. The control device is in signal connection with the lower feed adjusting driving part and the upper feed adjusting driving part and data relating to the sewing procedure to be executed for independently operating the adjusting driving part in the execution of the sewing procedure and the storing data Device. As a result, sewing machines with increased fabric transfer flexibility can be obtained and adapted to different sewing requirements.

Description

[0001] SEWING MACHINE [0002]

The present invention relates to a sewing machine comprising at least one upper conveying device for intermittent friction transfer contact with the upper side of the fabric and at least one lower conveying device for intermittent friction transfer contact with the lower side of the fabric, A conveying unit for intermittently conveying the recording medium; A mechanical upper feed adjusting device for adjusting the feed length of at least one upper feeder; A mechanical lower feed adjusting device for adjusting the feed length of at least one lower feeder; An upper feed adjusting drive for adjusting the upper feed adjusting device; And a lower feed adjusting drive for adjusting the lower feed adjusting device.

A sewing machine of the above kind is disclosed in EP 0 512 145 B1. This document describes that the length of the stitch length is adjusted by correspondingly modifying the transfer length of the upper and lower conveyors.

Many particularly complicated sewing operations require more flexible control of the textile transport for each sewing condition than is provided by known sewing machines.

The object of the present invention is therefore to develop a sewing machine of the above type which has increased flexibility so as to make it suitable for different sewing conditions.

This object is achieved according to the present invention, further comprising a control device in signal connection with a lower feed adjusting drive and a upper feed adjusting drive, the control device being capable of independently operating the adjustment drive in the execution of the sewing procedure and data relating to the sewing procedure to be performed And a storage device in which adjustment data allocated to these sewing procedures are stored.

The present invention is based on the fact that the mechanism for modifying the transport length of the upper and lower conveyors (which are already known) can be automated using a corresponding adjustment drive. The correction of the transfer length can now be performed by actuating each adjustment drive through the control device. The control device may be signal-connected to the external sensor and / or may have the control drive directly affected by the control element of the sewing machine such as a foot switch, knee lever or button. In this way, the transfer of the fabric can be flexibly adapted, for example, to a seam pattern. For example, the length of the stitches in a corner area between two seams that are in contact with each other to form a corner can be adjusted so that the stitch ends at the corner so that the last stitch has the same length as the previous stitch. The control device allows this type of feed length adjustment to be performed throughout the entire sewing procedure and retrieves each adjustment data required for the adjustment drive each time. The transfer can be adjusted to accommodate variable stitching parameters (e.g., a variable fabric composition or a change in the sewing direction of the fabric to warp and weft angles). With different total feed lengths, ie different stitch lengths, different ratios of the feed lengths between the upper feeder and the lower feeder can be determined, which will be referred to as the collecting feed value. The feed length can be modified to achieve the desired visual effect during the sewing process.

The transfer unit further comprises at least one additional lower conveyor for intermittent friction transfer contact with the underside of the fabric; An additional mechanical lower feed adjusting device for adjusting the feed length of the additional lower feeder; And an additional lower feed adjusting drive for adjusting the further lower feed adjusting device, the two lower feeders having a contact along the sewing direction, the contact being spaced apart from one another to make a transfer contact with the lower side of the fabric, And further regulating data is stored in the regulating device and these additional regulating data are assigned to the data relating to the sewing procedure to be executed in order to operate an additional lower feed adjusting driving part in the execution of the sewing procedure The featured sewing machine can adjust the length of the upper conveyor or the conveying length ratio to that of the lower conveyor as well as adjust the conveying lengths of the two lower conveyors relative to each other, Setting . Additional lower feed control devices operated through the control device can provide increased flexibility when setting alternative feed values through the sewing machine of the present invention.

The guided slider mechanism used as the regulating device has proved to be suitable because of its mechanical rigidity with at least one guided slider regulator which is displaceable along the regulating direction of each regulating drive.

An adjustment device having a cam disc that can be rotationally driven by an assigned adjustment drive, the cam disc having a circumferential area with a radius varying over the circumference and the adjuster interacting with parts of the circumferential area to adjust the transfer length And the adjustment device mechanically connected to the assigned conveyor can be integrated into the sewing machine with minimal effort.

The stepper motor, which is the adjustment drive, enables fine adjustment of the feed correction.

A compact sewing machine can be obtained by the housing of the adjusting drive part in the sewing machine.

The control device is connected to the seal tension device so that the tension of the seal can be automatically adapted to the stitch length set by the control device.

Another object of the present invention is to provide a method of working the sewing machine of the present invention.

The first method of working for the sewing machine of the present invention is,

Setting a first feed value for moving the fabric into at least one upper feeder and at least one lower feeder;

- sewing the fabric with a first feed value;

Setting a second feed value for moving the fabric to at least one upper feeder and at least one lower feeder, the second feed value being different from the first feed value; And

- sewing the fabric with a second feed value.

Another way of working for the sewing machine of the present invention,

Setting a first collecting conveyance value which is a ratio between the conveying length of the upper conveyor and the conveying length of the lower conveyor for moving the fabric into at least one upper conveyor and at least one lower conveyor;

- sewing the fabric with a first collecting feed value;

Setting a second collective conveyance value different from the first collective conveyance value for conveying the fabric to at least one upper conveyor and at least one lower conveyor; And

- sewing the fabric with a second gathering feed value.

Another way of working for the sewing machine of the present invention,

Setting a first creasing feed value, which is a ratio between a feed length of one lower feeder and a feed length of another lower feeder, for moving the fabric between the two lower feeders;

Sewing the fabric with a first creasing feed value;

Setting a second creasing feed value for moving the fabric to the two lower feeders, the second creasing feed value being different from the first creasing feed value; And

- sewing with a second creasing feed value.

The advantages of these working methods correspond to the advantages described above for the sewing machine of the present invention.

The sewing machine of the present invention has a high degree of flexibility to adapt the fabric transfer to other sewing conditions and the transfer of the fabric can be adapted flexibly to, for example, a seam pattern, for example, a corner between two seams The length of the stitches in the area can be adjusted so that the stitch ends at the corners so that the last stitch has the same length as the previous stitch. In addition, the feed length may be modified to obtain the desired visual effect during the sewing process.

1 is a side view of a sewing machine having a substrate.
2 is a plan view of the sewing machine according to Fig.
3 is a bottom view of the sewing machine according to Fig.
4 is a front view of the sewing machine along the IV direction of Fig.
5 is a cross-sectional view taken along the line V-V in Fig.
6 is a cross-sectional view taken along the line VI-VI in Fig.
7 is a cross-sectional view taken along the line VII-VII in FIG.
Fig. 8 is a side view of the substrate viewed in the same direction as Fig. 1, in which mechanical components are omitted in comparison with Fig. 1 so that only the mechanical coupling of the mechanical lower transfer regulating device is shown, It is in a "large displacement" position.
9 is a cross-sectional view taken along line IX-IX of Fig.
Fig. 10 is similar to Fig. 8 with the lower transport adjustment device in the "small displacement" position.
11 is a cross-sectional view taken along the line XI-XI in Fig.
Fig. 12 is an enlarged cross-sectional view of Fig. 4, particularly showing a conveyor used for conveying the fabric.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

The sewing machine 1 has an arm 2, a substrate 3 and a stand 3a for connecting the arm 2 and the substrate 3. [ At the free end of the arm 2, there is a carrier 4. In the arm 2, an arm shaft 5 is provided, and the arm shaft 5 can be rotationally driven by a main driving unit (not shown in detail). The needle bar 6 provided on the head 4 can be driven to move vertically up and down by the arm shaft 5. A needle (7) is provided at the lower end of the needle bar (6). When the sewing machine 1 is operated, the needles 7 of the needle sweat plate 8 inserted in the support plate 9 of the substrate 3 pass through the needle sweat holes. A hook, which interacts with the needle 7 for loop formation, is arranged below the needle sweat plate 8, and the hook is driven by a hook shaft and a direction switching gear which are not shown in detail. Similarly, the hook is driven by the arm shaft 5 as well. During needle sweat formation, the fabric is held in place by a fabric pressing foot 11 installed at the lower end of the pressure-foot bar 12.

The conveying unit 14 serves to intermittently convey the fabric in the sewing direction 13 (indicated by an arrow pointing from the right to the left in Fig. 12), and the conveyor of the conveying unit 14 Is frictionally engaged with the fabric. The upper conveyor 15 engages the upper side of the fabric and this upper conveyor 15 is shown in the zero position, compared with the zero position in the large displaced position 15 'displaced to the left do.

Two lower conveyors (strictly speaking, the first lower conveyor 16 and the second lower conveyor 17) are brought into contact with the underside of the fabric. The first lower conveyor 16 is shown on the left side of Fig. 12, and the second lower conveyor 17 is shown on the right side of Fig. Along the sewing direction 13, the two lower conveyors 16, 17 are disposed apart from each other and have contact portions making frictional transfer contact with the underside of the fabric. On the other hand, the conveyors 16 and 17 are compared to the zero position in the large displaced position 16 ', 17', which is shown as being in the zero position and displaced to the free side.

Each conveyor 15-17 has a serrated profile 18a for intermittent frictional transfer contact with the fabric.

The displacement of all the three conveyors 15 to 17 in the sewing direction can be determined separately for each conveyor 15 to 17 by referring to Figures 7 to 11, , 17) will be described below.

The first stepper motor 18 serves to adjust the conveying length of the stepper motor 18, which is firmly fixed to the substrate 3. The first stepper motor 18 is operatively connected to the first lower conveyor 16. A contact body 19 having a helical outer circumferential support wall 20 is rotatably connected to the drive shaft of the first stepper motor 18 so that the contact wall 20 has a circumferential portion with a varying radius. The contact member 19 is a cam disc which can be driven to rotate. The contact wall 20 is supported by a regulator or phase change in the form of a needle bearing 21 held in a forked direction change rod 22. The needle bearing 21 thus forms a sliding body that interacts with the contact wall 20. The direction changing rod 22 is connected to the guided slider adjusting member 24 through the joint 23 and the guided slider adjusting member 24 is rotatably connected to the sliding guide 25. [ The sliding block 26 is displaceable along the sliding guide. The sliding block 26 is connected to the triangular lever 27. The triangular lever 27 is vibrated by the eccentric shaft 28. In accordance with the guiding direction of the sliding guide 25, this vibration is converted into a higher or lower rotational vibration of the transmission shaft about the longitudinal axis of the transmission shaft 29.

Figures 7, 10 and 11 illustrate that the first stepper motor 18, including the first stepper motor 18, in the "small displacement" position, where the angular adjustment amount transmitted to the transmission axis 29 during operation at this position is substantially zero, (30). When the sewing machine is in operation, the assigned lower conveyor is in a substantially zero position. In the "small displacement" position, the outermost end of the contact wall 20 is supported on the needle bearing 21, and thus is at a maximum distance from the drive shaft of the first stepper motor 18. [

In contrast, Figs. 8 and 9 show the "large displacement" position of the first lower transport adjustment device 30. Fig. In this "large displacement" position, the innermost end of the contact wall 20 is supported on the needle bearing 21, and therefore at a small distance from the drive shaft of the stepper motor 18. [ Between these two positions, i.e. between "small displacements" and "large displacements ", the drive shaft of the first stepper motor 18 makes a relative rotation of about 225 degrees. Since the stepper motor 18 has a high step accuracy, all intermediate positions between "small displacement" and "large displacement" can be substantially continuously adjusted.

At the "large displacement" position, the sliding block 26 is guided by the sliding guide 25 in a guiding direction upward at an angle of about 45 degrees, as shown in Fig. Thus, the maximum rotation angle adjustment amount is transmitted to the transmission shaft 29. The lower conveyor assigned between the needle stitches is displaced between the zero position and the "large displacement" position shown in Fig.

At the intermediate position of the first lower feed control device 30 between the indicated "small displacement" and the "large displacement" position, the first lower feeder 16 thus moves its zero position and this & As shown in Fig. Likewise, all intermediate positions between the maximum feed and the zero feed shown in Fig. 12 are possible depending on the position of the first stepper motor 18. Fig.

And the second lower conveying control device 31 serves to controllably control the conveying length of the second lower conveying device 17. [ The second lower feed control device also has a second stepper motor (32) mounted on the substrate (3) below the support plate (8). The second stepper motor 32 is operatively connected to the second lower conveyor 17. The mechanical operation and design of the second lower feed regulating device 31 corresponds to the case of the first lower feed regulating device 30 except that the second lower feed regulating device 31 is connected to the first lower feed regulating device 30 on the transmission shaft 29 of the transmission shaft 29 and the transfer shaft 33 is located on the center of the common axis of the two transmission shafts 29, So that it rotates independently of the transmission shaft 29 by an angle determined by the angle.

The transmission shafts 29 and 33 act on the respective conveyers of the lower conveyors 16 and 17 independently of each other and the second stepper motor 32, Can adjust the conveying length of the lower conveyor operated by the second lower conveying regulating device 31 as it is determined.

Fig. 5 shows a second lower conveying regulating device 31 at a position corresponding to the position of the first lower conveying regulating device 30 according to Figs. 10 and 11, that is, in the "small displacement" position. When the second stepper motor 32 rotates, the second lower feed adjusting device 31 can be substantially continuously displaced to the "large displacement" position.

The upper feed regulating device 34 serves to regulate the feed length of the upper feeder 15. This upper feed adjusting device 34 has a third stepper motor 35 which is also fixed to the substrate 3 and installed below the support plate 9. The third stepper motor 35 is operatively connected to the upper conveyor 15. Mechanical transmission from the stepper motor 35 to the upper conveyor 15 corresponds to that described above for the two lower conveyance regulating devices 30, 31. In contrast to the lower transfer regulating devices 30 and 31 the upper transfer regulating device 34 has a tension rod 36 serving as a transfer member between the needle bearing 21 and the guided slider regulator 24, The rod 36 extends in the stand 3a. The corresponding angular adjustment amount is transmitted to the transmission shaft 37 of the upper transfer control device 34 and the transfer shaft is transferred to the upper conveyor 15 through the push rod 37a, As shown in Fig. The transmission shaft 37 extends along the arm 2.

All three stepper motors 18, 32, and 35 are housed in a housing (not shown in the figure) surrounding the substrate 3.

The control device 38 schematically shown in FIG. 1 is signal connected to two lower transfer regulating devices 30, 31 and an upper transfer regulating device 34. The control device 38 has a storage device 39 for storing data relating to a sewing procedure to be executed and adjustment data, and the adjustment data is allocated to these sewing procedure data, and the stepper motor 18, 32, 35 ).

Since the conveying lengths of the conveyors 15 to 17 can be independently adjusted by the adjusting devices 30, 31 and 34, the adjustability including the main adjustability is obtained as follows.

First, the conveying lengths of all three conveyors 15 to 17 can be synchronously changed with each other in the same manner, so that all three conveyors 15 to 17 can be moved from the first common conveying length to the second common conveying length have. In this case, therefore, the total feed length of the sewing machine 1 and therefore the stitch length are modified.

Secondly, the conveying path of the two lower conveyors 16, 17 can be modified in a synchronous manner so that the conveying length of the upper conveying device remains constant or is different from that of the lower conveying devices 16, 17 Amount is corrected. With this adjustment, the difference between the conveying path on which the lower conveying device 16, 17 and, on the other hand, the upper conveying device 15 is moved, is changed when the conveying movement is executed. This adjustment will hereinafter be referred to as the differentiability of the transport of the sewing machine 1 or the modification of the collecting feed value. Due to this differential possibility, the collection of the upper fabric conveyed by the upper conveyor 15 can be modified with respect to the lower fabric conveyed by the lower conveyor 16,17.

Thirdly, only the transfer lengths of the two lower conveyors 16, 17 can be modified relative to each other to modify the ruffling of the lower fabric during the transfer, Lt; / RTI > This adjustable fabric transfer characteristic of the sewing machine 1 is hereinafter referred to as the differential or correction of the creasing feed value.

These three general adjustability possibilities, namely "correction of the traverse length", "differential likelihood"

And "differential" may overlap each other to a desired degree.

In a first exemplary method of operation of the sewing machine 1, the first feed value is transmitted to all three stepper motors 18, 18 via the control device 38 to initially move the fabric to the feeders 15 - 32, 35) are set synchronously. Next, as long as the first feed value, i.e., the first stitch length, is set, the fabric is sewn. Next, a second feed value different from the first feed value is set by synchronously activating the stepper motor (18, 32, 35) to move the fabric to the feeders (15-17). The fabric is then sewn, for example, with a resultant second feed value that may be greater than the first feed value, and the resultant seam thus has a larger stitch length than the previous one.

This controllable modification of the feed value can be detected, for example, by an additional sensor of the sewing machine 1, such as a photoelectric sensor or a touch probe, for detecting the end of the fabric requiring only a few needle-stitches until the end of the seam is reached Signal value so that the length of the needle stitch is matched so that the final stitch stitch ends at a predetermined position and the length of this final stitch stitch can be made substantially the same as that of the previous needle stitch. Similarly, when sewing a corner seam, there is no need to further reduce the stitch length in the corner area.

In addition, the tension of the yarn can be automatically adjusted to a predetermined stitch length by using the control device 38. To this end, the control device 38 actuates the electromagnetic seal tensioning device of the sewing machine 1, thereby increasing the tension of the yarn, especially when the stitch length increases.

Another alternative or additional working method of the sewing machine 1 utilizes the differential possibility. First, a first collecting conveyance value is set to move the fabric to the conveyors 15 to 17, for example, the fabric conveyance value provided by the upper conveyor 15 is provided by the lower conveyors 16, Lt; RTI ID = 0.0 > fabric. ≪ / RTI > Next, the fabric is sewn to this first collecting feed value. Next, the stepper motor 35 of the upper conveyor 15 is adjusted or the stepper motors 18, 32 of the two lower conveyers 16, 17 are synchronously adjusted to set the second collecting conveyance value , The second collective feed value is different from the first collective feed value. This adjustment may be such that, for example, when the second collecting conveyance value is set, the conveyance difference between the upper conveyor 15 and the lower conveyor 16, 17 is larger than before, so that the fabric is more tightly creased in the next sewing process Lt; / RTI > This effect can be used, for example, to obtain the desired visual sewing result when making a seam where a directional change occurs in a fabric having a desired rubbing direction, or to compensate for other collecting behavior of the fabric.

Other working methods which can alternatively or additionally be carried out with the sewing machine 1 use the differential. First, the first crevice feed value is set to move the fabric to the two lower feeders 16, 17, and the fabric feed value provided by the first lower feeder 16, for example, is fed to the second lower feeder 17 ) ≪ / RTI > If the first creasing feed value is set, the feed provided by the second lower feeder 17 will in particular exceed the feed provided by the first lower feeder 16 in particular. The fabric is then sewn to this first creasing feed value. Correspondingly, for example, one of the two stepper motors 18, 32 of the lower conveyors 16, 17 is activated to set the second creasing feed value, which is the second creasing feed value, It is different from the feed value. The adjustment can be made, for example, so that the conveying difference between the two lower conveyors 16, 17 is now larger than before, to obtain a more pleated fabric by the two lower conveyors 16, 17. The fabric is then sewn to a second creasing feed value. Likewise, this third working method can be used to obtain a particular visual sewing result, especially when making a changing seam, or to compensate for a change in fabric properties during the sewing process.

Modification of the fabric parameters which can compensate for the differential likelihood or the compensation of the differential can include, for example, changing the weave type of the fabric, changing the material composition of the fabric, or changing the degree of twist of the warp and weft.

The operation of the stepper motors 18, 32, and 35 can be automatically performed by the control apparatus when the sewing program or the sewing procedure is executed. Alternatively or additionally, this operation can be carried out directly by the operator, for example via a foot switch or knee lever or button, so that the operator can modify the stitch length, differential likelihood or differential to a desired degree in the sewing process. This type of direct operation allows the operator to speed up the corrections that are often needed when inserting the sleeve to compensate for cutting tolerances.

In particular, it is possible to compensate for a change in the sewing behavior due to an angle change in the sewing direction between the warp yarns of the fabric and the weft direction. This type of compensation can occur in a continuously adjustable manner, for example, when sewing a curved seam.

Alternatively, instead of using an external sensor, the feed value can also be modified according to internal parameters such as the number of stitches or the path of the sewed seam.

14: Feed unit
34: upper feed control device
30, 31: Lower feed control device
35: upper feed adjustment driving unit
18, 32: Lower feed control adjusting drive

Claims (7)

At least one upper conveyor (15) for intermittent friction transfer contact with the upper side of the fabric, and at least one lower conveyor (16, 17) for intermittent friction transfer contact with the lower side of the fabric A conveying unit (14) for intermittently conveying the fabric;
A mechanical upper feed regulating device (34) for regulating the feed length of at least one upper feeder (15);
A mechanical lower feed regulating device (30, 31) for regulating the feed length of at least one lower feeder (16, 17);
An upper feed adjusting drive 35 for adjusting the upper feed adjusting device 34; And
- a lower feed adjusting drive (18, 32) for adjusting the lower feed adjusting device (30, 31), the sewing machine (1)
And a control device 38 which is connected to the upper transfer control driving part 35 and the lower transfer control driving part 18 and 32. The control device controls the driving of the adjustment driving part 18, 32, 35), characterized in that the sewing machine has a storage device (39) in which the adjustment data allocated to these sewing procedures are stored. The apparatus according to claim 1, wherein the transfer unit (14)
At least one additional lower conveyor (17, 16) for intermittent friction-transfer contact with the underside of the fabric;
- additional mechanical lower feed regulating devices (31, 30) for regulating the feed length of the additional lower feeders (17, 16); And
- an additional lower feed adjusting drive (35, 32) for adjusting the further lower feed adjusting device (31, 30)
The two lower conveyors 16, 17 have a contact along the sewing direction 13, which are arranged apart from one another to make a transfer contact with the lower side of the fabric,
The control device 38 is also in signal connection with additional lower feed regulating devices 31 and 30,
The additional adjustment data is stored in the storage device 39 and these additional adjustment data are assigned to the data relating to the sewing procedure to be executed in order to activate the additional lower feed adjustment drive part 35, 32 in the execution of the sewing procedure Sewing machine. 2. The apparatus according to claim 1, wherein the adjusting device (30, 31, 34) comprises at least one guided slider adjusting member (24) displaceable along the adjusting direction of each adjusting driving member And a sewing machine. 4. The cam disk according to claim 3, characterized in that at least one of the adjusting devices (30, 31, 34) has a cam disk (19) which can be rotationally driven by the assigned adjusting drive part (18, 32, 35) Has a circumferential region 20 whose radius varies over the circumference and the regulator 21 interacts with the portion of the circumferential region 20 to regulate the feed length, Are mechanically connected to the first and second sockets (15 to 17). The sewing machine according to claim 1, characterized in that the stepper motor (18, 32, 35) is used as the adjustment drive part. 2. A sewing machine according to claim 1, characterized in that at least one adjustment drive (18, 32, 35) is housed in the housing of the sewing machine (1). The sewing machine according to claim 1, wherein the control device (38) is connected to a yarn tensioning device.

Images