CN210085738U

CN210085738U - Sewing machine for four-machine-head double-side seam of sun-shading curtain of panoramic sunroof of automobile

Info

Publication number: CN210085738U
Application number: CN201822232049.6U
Authority: CN
Inventors: 刘景波; 赵永宝
Original assignee: Tianjin Richpeace Computer and Machinery Co Ltd
Current assignee: Tianjin Richpeace AI Co Ltd
Priority date: 2018-12-28
Filing date: 2018-12-28
Publication date: 2020-02-18
Anticipated expiration: 2028-12-28

Abstract

The utility model discloses a four-head double-side seam sewing machine for a sun-shading curtain of a panoramic sunroof of an automobile, which consists of an illumination walking workbench, a paving auxiliary mechanism, a tension sewing machine head, a tension machine head opening and closing mechanism, a guide sewing machine head, a guide machine head opening and closing mechanism, an automatic winding mechanism, a rack, a walking guide rail rack, a tension large coil feeding mechanism, a tension automatic small coil feeding mechanism, a guide coil feeding mechanism and a fabric automatic clamping mechanism; the illumination walking workbench is arranged on the rack and the walking guide rail rack through the guide rail sliding block; the auxiliary material spreading mechanism is arranged on the rack and the traveling guide rail ball screw through the guide rail sliding block; the machine head opening and closing mechanism is arranged on the two sides of the rack and the walking guide rail; the automatic winding mechanism is arranged on the rack and the walking guide rail rack; the tension large coil feeding mechanism and the tension automatic small coil feeding mechanism are arranged on the tension sewing machine head through the connecting frame.

Description

Sewing machine for four-machine-head double-side seam of sun-shading curtain of panoramic sunroof of automobile

Technical Field

The utility model belongs to the technical field of the sewing machine equipment technique and specifically relates to a sewing machine of four aircraft nose bilateral seam steel bands of car panorama skylight sunshade screen.

Background

With the improvement of the requirements of people on the automobile configuration, the skylight/panoramic skylight becomes one of the hard indexes of purchasing automobiles by many people, and with the configuration, the automobile looks high-grade, the comfort is improved a lot, and the skylight is developed, so that the quality of air in the automobile can be optimized, and when the air in the automobile is required to be replaced during the running of the automobile, the skylight can be opened, so that the air in the automobile can be replaced quickly and the skylight is cleaner than the side window glass; in addition, the temperature in the automobile is very high after insolation, and the effect of quickly reducing the temperature can be achieved by opening the skylight; above all, skylights can even become the most important escape routes if a traffic accident happens in an unfortunate way.

Because the sewing of the sunshade curtain and the steel belt needs to wind the steel belt at the cloth edge of the sunshade curtain and then sew the steel belt (Y-tension or tension for short),

the sunshade curtain and the guide strip need to be sewn on the sunshade curtain, the sunshade curtain and the guide strip are in a laminated relation (Y-guide or guide for short), and the tension and guide raw material properties and the manufacturing process are different, so that the tension and guide sewing methods, the feeding modes and the like are not the same, and therefore only independent equipment for manufacturing the tension and guide is available in the market.

In addition, the processing difficulty of the product of the automobile panoramic sunroof sun-shading curtain which is used as a flexible material and combined with a rigid material and a thick material is very high, and aiming at the existing production of the automobile panoramic sunroof sun-shading curtain, the production always stays in manual participation and semi-automatic production; the automobile panoramic sunroof sun-shading curtain has high requirements on product precision and product quality, so that the requirements on skills of operators are high, the production efficiency is extremely low, and the market supply can not be met; with the rising of labor cost and the reduction of personnel skills, the automobile skylight production industry is forced to call for a long day; the enterprise managers search for an automatic production system capable of replacing manpower, and the dependence on workers and skilled technicians is reduced as much as possible.

Because the automatic equipment is in a blank state, the automatic feeding bullet clip mechanism is produced, the equipment can automatically convey the tiled cloth piece and the rolled steel belt to a sewing position, the cloth piece is automatically wrapped on the steel belt through a special edge folding device, the cloth piece and the steel belt are sewn together in a perfect and high-precision mode through a special sewing machine head, and the sewn sun-shading curtain can be automatically rolled up after sewing is finished.

Disclosure of Invention

An object of the utility model is to overcome above-mentioned prior art's weak point, a two side seam sewing machines of four aircraft noses of car panorama skylight sunshade screen is provided, this equipment has not only improved the automation and the intelligent degree that two kinds of products (tension and guide) were made up (operation at ordinary times only need click in the control screen and can accomplish, parameter and function etc. surveyability in the control screen), and still fuse the equipment of production tension and guide to an equipment, can realize making up of tension and can realize making up of guide again on this equipment, only need a key to switch just can realize the preparation from a product to another kind of product, this equipment has reduced equipment quantity, the time of changing equipment has been saved, the production efficiency of car panorama skylight sunshade screen has been improved greatly.

The utility model aims at realizing through the following technical scheme:

a sewing machine for double-side sewing of four machine heads of a sun-shading curtain of a panoramic sunroof of an automobile comprises an illumination walking workbench, a material paving auxiliary mechanism, a tension sewing machine head, a tension machine head opening and closing mechanism, a guide sewing machine head, a guide machine head opening and closing mechanism, an automatic winding mechanism, a rack, a walking guide rail rack, a tension large coil feeding mechanism, a tension automatic small coil feeding mechanism, a guide coil feeding mechanism and a fabric automatic clamping mechanism.

The illumination walking workbench is arranged on the rack and the walking guide rail rack through the guide rail sliding block.

The auxiliary material spreading mechanism is arranged on the rack and the traveling guide rail ball screw through the guide rail sliding block.

The two sewing machine heads are arranged on the respective machine head opening and closing mechanisms.

The machine head opening and closing mechanism is arranged on two sides of the rack and the walking guide rail.

The automatic winding mechanism is arranged on the rack and the travelling guide rail rack and is close to the guide machine head.

The tension large coil feeding mechanism and the tension automatic small coil feeding mechanism are arranged on the tension sewing machine head through the connecting frame.

The automatic fabric clamping mechanism is arranged on the illumination walking workbench.

The adopted specific technical scheme is as follows:

1. when sewing a Y-stretch product (see FIG. 3), the Y-guide work head is opened to the maximum at both ends:

(1) example of Y-tension product sewing:

wrapping the steel belt with cloth, sewing the steel belt together with sewing equipment, and sewing the cloth and the steel belt with holes.

(2) Y-tension product sewing process analysis:

conveying a steel belt, wrapping the steel belt by flanging a flexible material (cloth piece), enabling the edge of the cloth to be tightly combined with the steel belt by using a rotating friction force of a brush wheel, driving the cloth piece and the steel belt with holes to move forward by alternate action of large and small press feet, and performing double-needle sewing.

2. When sewing a Y-guide product (see FIG. 4), the Y-tension working head is opened to the maximum at both ends:

(1) examples of Y-guide product sewing:

and simultaneously sending out the cloth and the guide strip, sewing the guide strip and the cloth with the guide strip on the upper part and the cloth on the lower part.

(2) Analysis of Y-guide product Sewing procedure:

the guide bar and the cloth sheet are conveyed simultaneously, the guide bar is arranged on the upper portion, the cloth sheet is arranged on the lower portion, the small presser foot moves up and down and drives the guide bar and the cloth sheet to advance together with the cloth feeding tooth, and the large presser foot plays a role in smoothing and single-needle sewing.

The utility model has the advantages and beneficial effects that:

the utility model overcomes the problems of low production efficiency of the traditional automobile skylight sunshade curtain and the need of matching independent equipment for sewing sunshade curtains with different technologies, fully realizes the automatic production of the automobile panoramic skylight sunshade curtain by the design of the utility model, integrates Y-tension and Y-guide independent equipment together, can realize two manufacturing methods and technologies on one equipment, reduces the manual participation, lightens the labor intensity of workers, reduces the dependence on technical skill, improves the production efficiency by times, ensures the product consistency, solves the great problem of the industry to the maximum extent, technically improves a step, leads the production of the automobile panoramic skylight sunshade curtain to enter into the automation, intellectualization, high efficiency and standardization era, thereby changing the backward image of the traditional production in the industry, and reduces the technical requirement of one-line operation technology, the difficult problem of the employment of enterprises is solved.

Drawings

FIG. 1 is a perspective view of a sewing machine for sewing two sides of four machine heads of a sun-shading curtain of a panoramic sunroof of an automobile;

FIG. 2 is a front view of a sewing machine for sewing two sides of four machine heads of the sun-shading curtain of the panoramic sunroof of the automobile;

FIG. 3 is a view showing an example of sewing a cloth and a steel belt with holes;

FIG. 4 is a flow chart of the operation of a sewing machine for the Y-tension of the sunroof covering;

FIG. 5 is a view showing an example of sewing the guide bar and the cloth;

FIG. 6 is a flowchart of the operation of a sewing machine for a Y-guide of a sunroof covering for an automobile;

FIG. 7 is an enlarged view of the width adjustment structure of the worktable;

FIG. 8 is an enlarged perspective view of the table;

FIG. 9 is a perspective enlarged view of the cloth clamping mechanism;

FIG. 10 is a front view of the automatic small steel coil feeding mechanism;

FIG. 11 is a front view of an automatic Teflon guide bar feeding mechanism;

FIG. 12 is a schematic view of the Y-tension handpiece opening and closing mechanism;

FIG. 13 is a schematic view of the Y-guide head opening and closing mechanism;

FIG. 14 is a schematic view of a slide table for opening and closing a machine head;

FIG. 15 is a perspective enlarged view of the automatic winding mechanism;

FIG. 16 is an enlarged perspective view of the auxiliary mechanism for spreading;

fig. 17 is an overall schematic view of the steel strip clamping device.

1. Illumination walking workbench 2, paving auxiliary mechanism 3, tension sewing machine head 4, tension machine head opening and closing mechanism 5, guide sewing machine head 6, guide head opening and closing mechanism 7, automatic winding mechanism 8, rack and walking guide rail rack 9, tension large coil and small coil feeding mechanism 10, tension automatic small coil feeding mechanism 11, guide coil feeding mechanism 12, fabric automatic clamping mechanism 13, rack 14, gear 15, transmission shaft I16, servo motor I17, moving table opening and closing limit 18, large coil feeding wheel 19, load wheel 20, small coil feeding wheel 21, moving table opening and closing limit sensor 22, material pressing arm 23, material pressing aluminum profile 24, cylinder I25, cloth pressing plate 26, transmission shaft II 27, cylinder II 28, left rotating shuttle 29, right rotating shuttle 30, steel strip clamping device 31, clamping movement sliding table 32, servo motor II 33, lead screw I34, linear guide rail 35, servo motor III 36, proximity sensor 37 The four servo motors 38, the sensor induction block 39, the five servo motors 40, the linear guide rail 41, the gear rack 42, the material receiving servo motor 43, the material paving servo motor 44, the second screw rod 45, the screw nut 46, the auxiliary table top 47, the side auxiliary positioning 48, the six servo motors 49, the upper sensor 50, the motor driving wheel 51, the lower sensor 52, the sewing machine head 53, the machine head shell 54, the rear cover 55, the presser foot feeding shaft 56, the triangular connecting rod 57, the large presser foot 58, the small presser foot 59, the driving presser foot motor 60 and the guide rail slide block.

Detailed Description

For further understanding of the contents, features and effects of the present invention, the following embodiments will be exemplified in conjunction with the accompanying drawings. It should be noted that the present embodiment is illustrative, not restrictive, and the scope of the invention should not be limited thereby.

Sewing machine of four aircraft nose bilateral seams of car panorama skylight sunshade screen comprises illumination walking workstation (1), stone complementary unit (2), extension sewing machine head (3), extension aircraft nose opening and shutting mechanism (4), guide sewing machine head (5), guide aircraft nose opening and shutting mechanism (6), automatic winding mechanism (7), frame and walking guide rail rack (8), the big coil of extension and little coil of strip feeding mechanism (9), the automatic little coil of strip feeding mechanism (10) of extension, guide send coil of strip mechanism (11), surface fabric self-holding mechanism (12).

The illumination walking workbench (1) is arranged on the rack and the walking guide rail rack (8) through a guide rail sliding block.

And the material spreading auxiliary mechanism (2) is arranged on the rack and the traveling guide rail ball screw through the guide rail sliding block.

The machine head opening and closing mechanism is arranged on two sides of the rack (8) of the rack and the walking guide rail.

The automatic winding mechanism (7) is installed on the rack and the walking guide rail rack (8) and is close to the guide machine head (5).

The tension large coil feeding mechanism and the tension automatic small coil feeding mechanism (10) are arranged on a tension sewing machine head (5) through a connecting frame.

The automatic fabric clamping mechanism (12) is arranged on the illumination walking workbench (1).

Firstly, the implementation process:

A. y-tension implementation:

the first step, select Y-tension mode on the control screen, Y-guide sewing aircraft nose (5) and Y-guide roll mechanism (11) open to the maximum to both sides at this moment, roll up positive curtain size isoparametric input control screen to be made, the apparatus is adjusted to the corresponding width and length automatically, wherein include: the width of the Y-guide sewing machine head (5) is automatically adjusted, the width of the walking workbench (1) is automatically adjusted, the width of the material laying auxiliary mechanism (2) is automatically adjusted, the width of the Y-tension sewing machine head (3) is automatically adjusted, and the width of the Y-tension sewing machine head (7) is automatically adjusted.

And secondly, laying the cut cloth pieces on a walking workbench (1) according to requirements.

And thirdly, pressing a cloth clamping button, clamping the fabric on the walking workbench (1) by the fabric automatic clamping mechanism (12), and pressing a starting switch to start sewing.

And fourthly, conveying the cloth to a seam starting position below a Y-tension sewing machine head (3) through a hemmer edge folding by the walking workbench (1), matching a tension automatic small steel coil conveying mechanism (10) with a tension large coil and a small steel coil feeding mechanism (9) to accurately convey the steel coil to the lower part of a machine needle, and clamping the front end of the steel band by a front steel band clamping mechanism on the walking workbench (1).

Fifthly, sewing the fabric and the steel belt together by the Y-tension sewing machine head (3) according to requirements, and clamping the rear end of the steel belt by a rear steel belt clamping mechanism on the walking workbench (1) when the fabric and the steel belt are sewn to the tail end.

And sixthly, after sewing is finished, the walking workbench (1) drives the cloth to continuously walk forwards to a material rolling position, the walking workbench (1) together with the automatic winding mechanism (7) and the fabric automatic clamping mechanism (12) automatically shrinks to the narrowest, and a rear steel belt clamping mechanism on the walking workbench (1) loosens.

And seventhly, manually cutting off redundant steel belts at the tail end of the sun roller blind, and hanging the steel belts on an automatic winding mechanism (7).

And eighthly, pressing a winding button, automatically adjusting the walking workbench (1) together with the automatic winding mechanism (7) and the fabric automatic clamping mechanism (12) to return to the original sewing width, rotating a winding head on the automatic winding mechanism (7) to wind up the sun-shading curtain, and simultaneously, following the front steel belt clamping mechanism on the illumination walking workbench (1) backwards to ensure the compactness of the sun-shading curtain.

And ninthly, taking down the rolled male roller shutter by an operator, pressing a return button, and returning the equipment to the initial state to wait for next sewing.

B. Y-guide implementation procedure:

the first step, select Y-guide mode on the control screen, Y-tension sewing aircraft nose (3) and tension are coiled and small coil of strip feeding mechanism (9) and Y-tension send automatically that small coil of strip mechanism (10) opens to the biggest to both sides this moment, and the positive curtain size isoparametric of book that will make is input to the control screen in, and equipment automatically regulated is to corresponding width and length, includes wherein: the width of the Y-guide sewing machine head (5) is automatically adjusted, the width of the Y-guide roll feeding mechanism (11) is automatically adjusted, the width of the walking workbench (1) is automatically adjusted, the width of the material paving auxiliary mechanism (2) is automatically adjusted, the width of the Y-guide sewing machine head (5) is automatically adjusted, and the width of the Y-guide sewing machine head (7) is automatically adjusted.

Fourthly, the traveling workbench (1) conveys the cloth to a sewing position below the Y-guide sewing machine head (5), and meanwhile, the Y-guide roll feeding mechanism (11) is matched to accurately feed the guide bar below the machine needle.

Fifthly, the Y-guide sewing machine head (5) sews the fabric and the guide strip together according to the requirement, and when the tail end is sewed, the guide strip is cut off by scissors on the Y-guide coil feeding mechanism (11).

And sixthly, after sewing, the walking workbench (1) drives the cloth to continuously move forwards to a material receiving position.

And seventhly, taking down the sewn roller shutter by an operator, pressing a return button, returning the equipment to the initial state, and waiting for next sewing.

II, workflow (see fig. 4 and 6):

A. the key technology is as follows:

1. the lighting workbench realizes that the Y-tension product and the Y-guide product share one workbench:

the middle of the workbench is used as a reference line, the illumination walking workbench (1) can be opened and closed towards two sides at the same time, and a Y-tension product and a Y-guide product can be sewn.

2. The automatic winding of single-person operation does not have frock:

the illumination walking workbench (1) and the automatic winding mechanism (7) automatically contract, steel belt heads are fixed in a spring needle hanging mode, the illumination walking workbench (1) and the automatic winding mechanism (7) automatically open, cloth is tensioned, synchronous rotation of the winding heads on two sides is achieved through the ball spline shaft, and the winding diameter is guaranteed through servo of the steel belt front end holding mechanism.

3. Symmetrical three-synchronous comprehensive sewing machine head:

the operation direction of the sewing machine head is opposite to that of all sewing machine heads on the market, the sewing stitches on two sides of the production line are ensured to be the same, the stability of the equipment is improved, and the equipment is more attractive.

4. Y-guide single-needle three-synchronous sewing machine head:

the guide head is a single-thread lock type sewing stitch, and adopts a single-needle three-synchronous structure, so that the synchronism and the accuracy of feeding are realized.

5. Consistency of rotating shuttle around Y-guide:

the guide left rotating shuttle (28) and the guide right rotating shuttle (29) are not symmetrical but are straight, and stitches on two sides are positive stitches at the moment, so that the consistency of the stitches on two sides is ensured.

6. Has the length and width automatic adjusting function:

a steel strip clamping device (30) is arranged on a clamping moving sliding table (31) below the lighting walking workbench (1), and the clamping moving sliding table (31) is controlled through a servo motor II (32), so that the steel strip clamping device (30) is automatically adjusted in the length direction; a rack (13) and a guide rail sliding block are arranged on the illumination walking workbench (1), and the rack (13) is driven by a first servo motor (16) to realize width adjustment.

7. The accurate adjustment function of the side location switching size:

the width of the spreading auxiliary mechanism (2) is adjusted by ball screw transmission, so that the transmission mode reduces the gap of gear and rack transmission, and the size of the side auxiliary table top is more accurate when the side auxiliary table top is opened and closed.

8. The automatic conveying function of the steel bars is provided:

an automatic small steel coil feeding mechanism (10) is added, and the small steel coil feeding wheel (20) is controlled by a servo motor IV (37) to realize accurate and controllable conveying of steel bars.

9. Has the automatic feeding function of the small steel coil:

an automatic small steel coil feeding mechanism (10) is installed, and small coils can be replaced without stopping.

10. Has the automatic conveying function of the Teflon guide strip:

similar to the automatic small steel coil feeding mechanism (10), the automatic Teflon guide strip feeding mechanism (11) is added, and the motor driving wheel (50) is controlled by the servo motor six (48) to realize accurate and controllable conveying of the guide strips.

11. The secondary pressing function of the fabric:

the vertical secondary pressing mechanism, namely the fabric automatic clamping mechanism (12), is added on the basis of the original one-time fabric pressing, so that the problem that the fabric is gathered to the middle in the fabric pressing process can be avoided.

12. The working area is internally provided with a safety grating protection device, so that the personal safety of workers is protected to the maximum degree during working.

B. The equipment parameters and functions are realized:

1. width adjustment of the walking table (see fig. 7 and 8):

the illumination walking worktable (1) is divided into a left worktable and a right worktable, and is connected with the base through a linear guide rail and a sliding block, and the two worktable surfaces and the base can relatively move in the width direction by the structure; a servo motor is installed on the base, and the servo motor drives a gear rack to adjust the width of the workbench.

2. Secondary automatic clamping fabric (see fig. 9):

the second cylinder (27) drives the transmission shaft (26) to rotate in a small-angle reciprocating mode through the connecting rod mechanism, the transmission box (22) transmits the motion of the transmission shaft (26) to the material pressing aluminum profile (23) to achieve one-time pressing, and the first cylinder (24) drives the cloth pressing plate (25) to press down for two times and clamp cloth.

3. Y-tension Large coil feed (see FIG. 10):

the mechanism is provided with two power motors which respectively drive a large steel coil feeding wheel (18) and a small steel coil feeding wheel (20), wherein the motor of the large steel coil feeding wheel (18) is an alternating current speed reduction motor, and the motor which drives the small steel coil feeding wheel (20) is a servo motor four (37). When the loading wheel (19) is in an upper position, the upper sensor is triggered to send an instruction, and the large steel coil feeding wheel (18) starts to continue feeding; the loading wheel (19) falls downwards, and when the loading wheel reaches the lower position, the loading wheel (19) triggers the lower position sensor to send out a command to stop feeding.

4. Y-guide large coil feeding (FIG. 11)

The coil feeding mechanism is similar to a Y-tension large coil feeding structure, and a servo motor V (48) is adopted to convey Teflon guide strips; when the loading wheel (19) is in an upper position, the upper sensor (49) is triggered to send out an instruction, and the motor driving wheel (50) starts to continue feeding; the loading wheel (19) falls downwards, and when the loading wheel reaches the lower position, the loading wheel (19) triggers the lower position sensor (51) to send out a command, and the material feeding is stopped.

5. The machine head is opened and closed (see fig. 12, 13 and 14):

the sewing machine head working area is realized by a proximity sensor (36) and a sensor induction block (38), and the machine frame is welded by standard section bars. The sliding table section bar installation linear guide (34) and the screw rod (33) form a standard sliding table module, and the left sliding table and the right sliding table are respectively driven by two servo motors III (35).

6. Automatic winding (see fig. 15):

the width of the automatic winding mechanism (7) can be automatically adjusted, the material receiving servo motor (42) drives the gear rack (41) to drive the material rolling mechanism to do opening and closing movement, and the width adjustment is realized along the linear guide rail (40). And a servo motor V (39) drives the tool to rotate through a belt pulley to roll materials.

7. Spreading auxiliary mechanism (see fig. 16):

the material spreading servo motor (43) drives the second lead screw (44) to rotate through the synchronous belt, and the second lead screw (44) drives the nut (45) to enable the auxiliary table top (46) to realize width adjustment.

Claims

1. A four-head double-side-seam sewing machine for a sun-shading curtain of a panoramic sunroof of an automobile comprises an illumination walking workbench, a material paving auxiliary mechanism, a tension sewing machine head, a tension machine head opening and closing mechanism, a guide sewing machine head, a guide machine head opening and closing mechanism, an automatic winding mechanism, a rack, a walking guide rail rack, a tension large coil feeding mechanism, a tension automatic small coil feeding mechanism, a guide coil feeding mechanism and a fabric automatic clamping mechanism; the method is characterized in that: the illumination walking workbench is arranged on the rack and the walking guide rail rack through the guide rail sliding block; the auxiliary material spreading mechanism is arranged on the rack and the traveling guide rail ball screw through the guide rail sliding block; the extension sewing machine head and the guide sewing machine head are arranged on the extension machine head opening and closing mechanism and the guide machine head opening and closing mechanism respectively; the machine head opening and closing mechanism is arranged on the two sides of the rack and the walking guide rail; the automatic winding mechanism is arranged on the rack and the travelling guide rail rack and is close to the guide machine head; the tension large coil feeding mechanism and the tension automatic small coil feeding mechanism are arranged on the tension sewing machine head through the connecting frame; the automatic fabric clamping mechanism is arranged on the illumination walking workbench.

2. The four-head double-side-seam sewing machine for the sun-shading curtain of the panoramic sunroof of the automobile according to claim 1, characterized in that: the automatic winding without the tool is operated by a single person.

3. The four-head double-side-seam sewing machine for the sun-shading curtain of the panoramic sunroof of the automobile according to claim 1, characterized in that: the stretching machine head is additionally provided with a motor on the basis of the original comprehensive feeding sewing machine, and a guide rail sliding block is additionally arranged, so that the presser foot can feed alternately.

4. The four-head double-side-seam sewing machine for the sun-shading curtain of the panoramic sunroof of the automobile according to claim 1, characterized in that: the guide head is a single-thread lock type sewing stitch, and adopts a single-needle three-synchronous structure, so that the synchronism and the accuracy of feeding are realized.

5. The four-head double-side-seam sewing machine for the sun-shading curtain of the panoramic sunroof of the automobile according to claim 1, characterized in that: the left rotating shuttle and the right rotating shuttle of the guide are not symmetrical but are straight, and stitches on both sides are positive stitches, so that the stitches on both sides are consistent.

6. The four-head double-side-seam sewing machine for the sun-shading curtain of the panoramic sunroof of the automobile according to claim 1, characterized in that: has the function of automatically adjusting the length and the width.

7. The four-head double-side-seam sewing machine for the sun-shading curtain of the panoramic sunroof of the automobile according to claim 1, characterized in that: the width of the spreading auxiliary mechanism is adjusted by ball screw transmission, so that the size is more accurate when the side positioning is opened and closed.

8. The four-head double-side-seam sewing machine for the sun-shading curtain of the panoramic sunroof of the automobile according to claim 1, characterized in that: the automatic small steel coil feeding mechanism can replace small coils without stopping, and has the function of automatically feeding small steel coils.

9. The four-head double-side-seam sewing machine for the sun-shading curtain of the panoramic sunroof of the automobile according to claim 1, characterized in that: the automatic fabric pressing mechanism adopts a vertical secondary pressing mechanism, so that the fabric is prevented from gathering towards the middle when the fabric is pressed.