Pressing device and sewing head structure of a patch pocket machine and its sewing method

Abstract

The present invention discloses a material pressing device and a sewing machine head structure of a pocket attaching machine and a sewing method thereof. Among them, the material pressing device and the sewing machine head structure of the pocket attaching machine include a material pressing device and a sewing machine head; the material pressing device includes a material pressing driving mechanism installed on a workbench, a conveying rack installed on the material pressing driving mechanism, and a material pressing component installed on the conveying rack; a U-shaped sewing groove is arranged on the material pressing component, and the material pressing driving mechanism can drive the material pressing component to move in the front-back and left-right directions; the sewing machine head includes a machine shell installed on the workbench, a sewing needle installed at the front end of the machine shell, a sewing needle driving mechanism for driving the sewing needle to move up and down, a sewing presser foot installed on the machine shell and sleeved on the sewing needle, and a motor for driving the sewing presser foot to move up and down through a transmission component; the sewing needle and the sewing presser foot can be correspondingly passed through the sewing groove. The present invention is provided with a material pressing device and a sewing machine head that can cooperate, realizing automatic sewing operation of jeans pockets and improving sewing efficiency.

Description

Technical Field

[0001] The present invention relates to the field of patch pockets for jeans, and specifically relates to a material pressing device and a sewing head structure of a patch pocket machine and a sewing method thereof. Background Art

[0002] With the development of industry, the degree of automation in clothing processing is getting higher and higher. In the sewing process of jeans pockets, machines that replace complex manual operations have also emerged on the market.

[0003] Regarding the sewing head used for sewing on pocket fabric and leg fabric, there are also many on the market. For example, a sewing machine disclosed in the authorized publication number CN112048838B specifically discloses a feed dog, a presser foot, a feeding mechanism for driving the feed dog to reciprocate back and forth, and a presser foot lifting mechanism for driving the presser foot to lift upward. It also includes a driving source, a driving shaft driven to rotate by the driving source, a stitch pitch cam and a presser foot lifting cam both fixed on the driving shaft, a stitch pitch link, a stitch pitch adjusting driving member installed on the stitch pitch link, a presser foot lifting link, a presser foot driving member installed on the presser foot lifting link, and a slider. The stitch pitch link is connected to the feeding mechanism, and the presser foot lifting link is connected to the presser foot lifting mechanism. A first chute extending along the length direction of the stitch pitch link is provided in the stitch pitch link. The slider is located in the first chute and is slidably matched with the first chute. The driving shaft is rotatably inserted into the slider, and the central hole of the slider is coaxial with the driving shaft. A second chute extending along the length direction of the presser foot lifting link is provided in the presser foot lifting link. The driving shaft is rotatably inserted into the second chute and is slidably matched with the second chute. When adjusting the stitch pitch, the driving source drives the driving shaft to rotate. The stitch pitch cam cooperates with the stitch pitch adjusting driving member and acts on the feeding mechanism through the stitch pitch link to change the amplitude of the feeding mechanism driving the feed dog to reciprocate back and forth. There is no power transmission between the presser foot lifting cam and the presser foot driving member. When lifting the presser foot, the driving source drives the driving shaft to rotate. The presser foot lifting cam cooperates with the presser foot driving member and acts on the presser foot lifting mechanism through the presser foot lifting link to drive the presser foot to move upward. There is no power transmission between the stitch pitch cam and the stitch pitch adjusting driving member.

[0004] Although the above-mentioned presser foot can cooperate with the sewing needle to sew the fabric, however, it only discloses the presser foot and the like, and there is no cooperation with the material pressing device. Therefore, it cannot achieve automated sewing, for example, it cannot achieve automated sewing of jeans pockets, thereby reducing production efficiency. Therefore, it is necessary to invent a structure of a material pressing device and a sewing head that can cooperate with each other to complete the automated sewing of jeans pockets. Summary of the Invention

[0005] In view of the problems existing in the above prior art, the object of the present invention is to provide a pressing device, a sewing head structure of a pocket-attaching machine and a sewing method thereof, which are provided with a pressing device and a sewing head that can cooperate with each other, so that the pressing device and the sewing head can realize the automatic sewing of the jeans pocket, thereby improving the sewing efficiency.

[0006] To achieve the above object, the technical solution of the present invention is as follows:

[0007] A pressing device, a sewing head structure of a pocket-attaching machine, comprising a pressing device and a sewing head respectively installed on a workbench; the pressing device includes a pressing driving mechanism installed on the workbench, a conveying frame installed on the output end of the pressing driving mechanism, and a pressing component installed on the conveying frame; the pressing component can be used to press the pocket fabric on the workbench and a U-shaped sewing groove is arranged on the pressing component, and the pressing driving mechanism can be used to drive the pressing component to move in the front-back and left-right directions; the sewing head includes a machine shell installed on the workbench, a sewing needle movably installed up and down at the front end of the machine shell, a sewing needle driving mechanism for driving the sewing needle to move up and down, a sewing presser foot movably installed up and down at the front end of the machine shell and sleeved on the sewing needle, and a motor for driving the sewing presser foot to move up and down through a transmission component; the sewing needle and the sewing presser foot can respectively pass through the sewing groove for sewing operations. The above settings can facilitate the cooperation of the pressing device and the sewing head to achieve automatic sewing.

[0008] The following technical solutions are also included:

[0009] Furthermore, the transmission component includes a swing arm, a swing rod, a transmission rod, a first link assembly and a second link assembly; one end of the swing arm is hinged to the machine shell; one end of the swing rod is eccentrically hinged to the output shaft of the motor, the other end of the swing rod is coaxially hinged to the other end of the swing arm and one end of the first link assembly, and the other end of the first link assembly is fixedly connected to the transmission rod horizontally and rotatably installed on the machine shell; one end of the second link assembly is hinged to the upper end of the sewing presser foot, and the other end of the second link assembly is fixedly connected to the transmission rod. The above settings can facilitate the motor to drive the sewing presser foot to move up and down.

[0010] Furthermore, the first link assembly includes two first links hinged to each other at one end; the other end of the first of the two first links is coaxially hinged to the swing rod and the swing arm; the other end of the second of the two first links is fixedly connected to the transmission rod; the second link assembly includes two second links hinged to each other at one end; the other end of the first of the two second links is hinged to the upper end of the sewing presser foot; the other end of the second of the two second links is fixedly connected to the transmission rod. The above arrangement can conveniently achieve the transmission connection between the swing rod, the swing arm and the transmission rod and conveniently achieve the transmission connection between the sewing presser foot and the transmission rod.

[0011] Furthermore, a connecting rod is connected between the other end of the first of the two second links and the sewing presser foot, and the other end of the first of the two second links is hinged to the upper end of the connecting rod, and the lower end of the connecting rod is fixedly connected to the upper end of the sewing presser foot. Therefore, the transmission connection between the second link and the sewing presser foot is achieved through the connecting rod.

[0012] Furthermore, one end of the swing rod is eccentrically hinged to the output shaft of the motor through an eccentric rod; one end of the eccentric rod is hinged to the swing rod, and the other end is fixedly connected to the output shaft of the motor.

[0013] Furthermore, one end of the swing arm is hinged to the machine housing through a positioning rod; the positioning rod is fixed to the machine housing, and one end of the swing arm is rotatably sleeved on the positioning rod. By providing the positioning rod, the swing arm can be positioned on the machine housing, that is, a fulcrum is formed, so that the swing arm can swing conveniently.

[0014] Further, the material pressing assembly includes a U-shaped pressing frame, an auxiliary pressing foot, a first lifting and pressing cylinder and a second lifting and pressing cylinder which are respectively installed on the conveying frame; the auxiliary pressing foot is installed in the hollow part of the U-shaped pressing frame; the auxiliary pressing foot includes a fixing plate, a left pressing plate and a right pressing plate which are symmetrically arranged on both sides below the fixing plate, and an auxiliary cylinder which is installed on the fixing plate and used for driving the left pressing plate and the right pressing plate to move in opposite or opposite directions; a U-shaped sewing groove is formed between the outer sides of the left pressing plate and the right pressing plate and the inner side of the U-shaped pressing frame; when the auxiliary cylinder drives the left pressing plate and the right pressing plate to move in opposite directions, the width of the sewing groove becomes larger; when the auxiliary cylinder drives the left pressing plate and the right pressing plate to move in opposite directions, the width of the sewing groove becomes smaller; both ends of the U-shaped pressing frame are respectively connected to the output shafts of one of the first lifting and pressing cylinders, and the first lifting and pressing cylinder is used for driving the U-shaped pressing frame to move up and down; the output shaft of the second lifting and pressing cylinder is connected to the fixing plate, and the second lifting and pressing cylinder is used for driving the auxiliary pressing foot to move up and down. The above settings can facilitate the first lifting and pressing cylinder and the second lifting and pressing cylinder to drive the U-shaped pressing frame and the auxiliary pressing foot to move up and down correspondingly, and the auxiliary cylinder can conveniently drive the left pressing plate and the right pressing plate to move in opposite or opposite directions, so as to achieve the effect of changing the width of the sewing groove.

[0015] Further, when the sewing needle driving mechanism drives the sewing needle to move up and down in the sewing groove for sewing operation, the motor drives the sewing pressing foot to move downward synchronously and press the pocket fabric flat, and the material pressing driving mechanism drives the material pressing assembly to move in a U shape; when the sewing pressing foot moves to the end of the sewing groove, the motor drives the sewing pressing foot to move upward by a certain distance, and when the sewing pressing foot leaves the end of the sewing groove, the motor drives the sewing pressing foot to move downward by a certain distance.

[0016] The present invention also provides a material pressing device of a pocket attaching machine and a sewing method of a sewing head, which adopt the above-mentioned material pressing device of the pocket attaching machine and the structure of the sewing head, and include the following steps:

[0017] S1. Stack the corresponding pocket fabric after hemming on the leg fabric of the jeans on the workbench;

[0018] S2. The material pressing driving mechanism drives the material pressing assembly to move above the fabric, and the first lifting and pressing cylinder and the second lifting and pressing cylinder drive the U-shaped pressing frame and the auxiliary pressing foot to press the leg fabric and the pocket fabric, and drag the leg fabric and the pocket fabric to move towards the sewing head through the material pressing driving mechanism until the sewing needle and the sewing pressing foot are aligned with one end of the sewing groove;

[0019] When the sewing needle driving mechanism drives the sewing needle to move up and down in the sewing groove and cooperate with a rotary hook for sewing, the motor drives the sewing presser foot to move downward synchronously to flatten the pocket fabric. At the same time, the presser material driving mechanism drives the presser material assembly to move in a U shape, so that the sewing needle and the sewing presser foot move relative to the presser material assembly from the side close to the presser material assembly at one end of the sewing groove to the other end to achieve continuous sewing operations; when the sewing presser foot leaves the end of the sewing groove, the motor drives the sewing presser foot to move downward by a certain distance;

[0020] S4. When the sewing needle and the sewing presser foot move to the other end of the sewing groove, the motor drives the sewing presser foot to move upward by a certain distance. And when the sewing needle and the sewing presser foot move to the end, the auxiliary air cylinder drives the left pressing plate and the right pressing plate to move in opposite directions, so that the width of the sewing groove becomes larger; then, the presser material driving mechanism continues to drive the presser material assembly to move, so that the sewing needle and the sewing presser foot move relative to the presser material assembly in the direction close to the auxiliary presser foot by a certain distance, and then move in a U shape to the other end of the sewing groove; when the sewing presser foot leaves the end of the sewing groove, the motor drives the sewing presser foot to move downward by a certain distance;

[0021] S5. When the sewing needle and the sewing presser foot move to the other end of the sewing groove, the motor drives the sewing presser foot to move upward by a certain distance; when the sewing needle and the sewing presser foot move to the end, the presser material driving mechanism continues to drive the presser material assembly to move, so that the sewing needle and the sewing presser foot move relative to the presser material assembly in the direction away from the auxiliary presser foot by a certain distance;

[0022] S6. After the two ends of the two U-shaped sewing threads are respectively connected, the sewing thread is cut;

[0023] S7. The presser device sends the sewn trouser leg fabric and pocket fabric to the next step.

[0024] Further, in step S4 and step S5, when the sewing needle and the sewing presser foot move to the end of the sewing groove, the distance that the sewing presser foot moves upward is calculated by the control system; and when the sewing needle and the sewing presser foot leave the end of the sewing groove, the distance that the sewing presser foot moves downward is also calculated by the control system.

[0025] The beneficial effects of the present invention are:

[0026] (1) The pressing device provided by the present invention can cooperate with the sewing machine head, so that the pressing device and the sewing machine head can cooperate with each other to complete sewing, and thus can complete the sewing operation of the jeans pocket automatically, improving the sewing efficiency.

[0027] (2) The present invention can also use the motor to control the sewing presser foot to rise or fall through the transmission component. In addition, since the motor can control the rotation speed through the control system, the control system can accurately control the rising and falling distance of the sewing presser foot through the motor, so as to prevent the sewing presser foot from scratching the pocket fabric or failing to flatten the pocket fabric accurately during the movement of the pressing component. Specifically, since the thickness of the two corners at the mouth of the jeans pocket fabric is relatively thick, when the sewing presser foot moves to the end of the sewing groove, the motor drives the sewing presser foot to move upward by a certain distance to prevent the sewing presser foot from directly hitting the pocket fabric and damaging the fabric. When the sewing presser foot leaves the end of the sewing groove, the motor drives the sewing presser foot to move downward by a certain distance, so that the pocket fabric can be continuously flattened by the sewing presser foot. Brief Description of the Drawings

[0028] Figure 1 is the schematic diagram of the overall structure of the present invention Figure 1 ;

[0029] Figure 2 is the schematic diagram of the overall structure of the present invention Figure 2 ;

[0030] Figure 3 is the schematic diagram after removing the workbench of the present invention Figure 1 ;

[0031] Figure 4 is the schematic diagram after removing the workbench of the present invention Figure 2 ;

[0032] Figure 5 is the structural schematic diagram of the sewing machine head of the present invention;

[0033] Figure 6 is the internal structural schematic diagram of the sewing machine head of the present invention Figure 1 ;

[0034] Figure 7 is the internal structural schematic diagram of the sewing machine head of the present invention Figure 2 .

[0035] Reference Signs:

[0036] 1. Workbench; 2. Sewing head; 21. Machine shell; 22. Sewing needle; 23. Sewing presser foot; 24. Transmission assembly; 241. Swing arm; 242. Swing rod; 243. Transmission rod; 244. First connecting rod; 245. Second connecting rod; 246. Connecting rod; 247. Eccentric rod; 248. Positioning rod; 25. Motor; 3. Conveyor frame; 4. Pressing component; 41. Sewing groove; 42. U-shaped pressing frame; 43. Auxiliary presser foot; 431. Fixed plate; 432. Left pressing plate; 433. Right pressing plate; 44. First lifting and pressing cylinder; 45. Second lifting and pressing cylinder; 46. Auxiliary cylinder. Detailed implementation mode

[0037] The following further elaborates on the invention in conjunction with the accompanying drawings and specific embodiments. The following description is merely exemplary and does not limit the protection scope of the invention.

[0038] As Figures 1 - 7 shown, the pressing device of a patch pocket machine and the structure of the sewing head 2 include a pressing device and a sewing head 2 respectively installed on a workbench 1; the pressing device includes a pressing drive mechanism installed on the workbench 1, a conveyor frame 3 installed at the output end of the pressing drive mechanism, and a pressing component 4 installed on the conveyor frame 3; the pressing component 4 can be used to press the pocket fabric on the workbench 1 and a U-shaped sewing groove 41 is provided on the pressing component 4. Of course, the pressing component 4 also presses the trouser leg fabric at the same time. The pressing drive mechanism can be used to drive the pressing component 4 to move in the front-back and left-right directions; the sewing head 2 includes a machine shell 21 installed on the workbench 1, a sewing needle 22 movably installed up and down at the front end of the machine shell 21, a sewing needle drive mechanism for driving the sewing needle 22 to move up and down, a sewing presser foot 23 movably installed up and down at the front end of the machine shell 21 and sleeved on the sewing needle 22, and a motor 25 for driving the sewing presser foot 23 to move up and down through a transmission assembly 24; the sewing needle 22 and the sewing presser foot 23 can be correspondingly inserted into the sewing groove 41 for sewing operations, that is, sewing the pocket fabric and the trouser leg fabric. Therefore, after the above settings, the pressing device and the sewing head can cooperate with each other to complete the sewing of the jeans pocket, so as to complete the automated sewing operation.

[0039] As Figures 3 - 7As shown in the figure, the transmission assembly 24 includes a swing arm 241, a swing rod 242, a transmission rod 243, a first link assembly, and a second link assembly. One end of the swing arm 241 is hinged to the housing 21. One end of the swing rod 242 is eccentrically hinged to the output shaft of the motor 25. The other end of the swing rod 242 is coaxially hinged to the other end of the swing arm 241 and one end of the first link assembly. The other end of the first link assembly is fixedly connected to the transmission rod 243 which is horizontally and rotatably mounted on the housing 21. One end of the second link assembly is hinged to the upper end of the sewing presser foot 23. The other end of the second link assembly is fixedly connected to the transmission rod 243. Through the above arrangement, it is convenient for the motor 25 to drive the sewing presser foot 23 to move up and down. In addition, since the motor 25 can be controlled in terms of rotational speed by the control system, the control system can accurately control the rising and falling distances of the sewing presser foot 23 through the motor 25, thereby preventing the sewing presser foot 23 from scratching the pocket fabric during the movement of the pressing assembly 4 or failing to accurately flatten the pocket fabric.

[0040] As Figure 6 and Figure 7 shown in the figure, the first link assembly includes two first links 244 whose one ends are hinged to each other. The other end of the first first link 244 is coaxially hinged to the swing rod 242 and the swing arm 241. The other end of the second first link 244 is fixedly connected to the transmission rod 243. Through the above arrangement, it is convenient to realize the transmission connection between the swing rod 242, the swing arm 241, and the transmission rod 243, so that the swing rod 242 can drive the transmission rod 243 to rotate conveniently.

[0041] As Figure 6 and Figure 7 shown in the figure, the second link assembly includes two second links 245 whose one ends are hinged to each other. The other end of the first second link 245 is hinged to the upper end of the sewing presser foot 23. The other end of the second second link 245 is fixedly connected to the transmission rod 243. Through the above arrangement, it is convenient to realize the transmission connection between the sewing presser foot 23 and the transmission rod 243, so that the transmission rod 243 can drive the sewing presser foot 23 to move up and down conveniently.

[0042] As Figure 6 and Figure 7 shown in the figure, a connecting rod 246 is connected between the other end of the first second link 245 and the sewing presser foot 23. The other end of the first second link 245 is hinged to the upper end of the connecting rod 246. The lower end of the connecting rod 246 is fixedly connected to the upper end of the sewing presser foot 23. Therefore, the transmission connection between the second link 245 and the sewing presser foot 23 is realized through the connecting rod 246.

[0043] As Figure 6 and Figure 7As shown, one end of the swing rod 242 is eccentrically hinged to the output shaft of the motor 25 through an eccentric rod 247; one end of the eccentric rod 247 is hinged to the swing rod 242, and the other end is fixedly connected to the output shaft of the motor 25. Of course, those skilled in the art should know that for the connection structure between the eccentric rod 247 and the motor 25, other connection structures can also be adopted, and no specific examples will be given here.

[0044] As Figure 6 and Figure 7 shown, one end of the swing arm 241 is hinged to the housing 21 through a positioning rod 248; the positioning rod 248 is fixed to the housing 21, and one end of the swing arm 241 is rotatably sleeved on the positioning rod 248. Specifically, the end of the swing arm 241 away from the swing rod 242 is sleeved on the positioning rod 248. By providing the positioning rod 248, the swing arm 241 can be positioned on the housing 21, that is, a fulcrum is formed, so that the swing arm 241 can swing conveniently.

[0045] As Figures 1 - 4 shown, the presser component 4 includes a U-shaped press frame 42, an auxiliary presser foot 43, and a first lifting cylinder 44 and a second lifting cylinder 45 respectively installed on the conveying frame 3; the auxiliary presser foot 43 is installed in the hollow part of the U-shaped press frame 42; the auxiliary presser foot 43 includes a fixing plate 431, a left press plate 432 and a right press plate 433 symmetrically arranged on both sides under the fixing plate 431, and an auxiliary cylinder 46 installed on the fixing plate 431 for driving the left press plate 432 and the right press plate 433 to move in opposite or away directions; a U-shaped sewing groove 41 is formed between the outer sides of the left press plate 432 and the outer sides of the right press plate 433 and the inner side of the U-shaped press frame 42; when the auxiliary cylinder 46 drives the left press plate 432 and the right press plate 433 to move in opposite directions, the width of the sewing groove 41 becomes larger; when the auxiliary cylinder 46 drives the left press plate 432 and the right press plate 433 to move in away directions, the width of the sewing groove 41 becomes smaller; both ends of the U-shaped press frame 42 are respectively connected to the output shaft of a first lifting cylinder 44, and the first lifting cylinder 44 is used to drive the U-shaped press frame 42 to move up and down; the output shaft of the second lifting cylinder 45 is connected to the fixing plate 431, and the second lifting cylinder 45 is used to drive the auxiliary presser foot 43 to move up and down. Through the above settings, the first lifting cylinder 44 and the second lifting cylinder 45 can conveniently drive the U-shaped press frame 42 and the auxiliary presser foot 43 to move up and down respectively, and the auxiliary cylinder 46 can conveniently drive the left press plate 432 and the right press plate 433 to move in opposite or away directions, so as to achieve the effect of changing the width of the sewing groove 41. Of course, there are other structures between the auxiliary cylinder 46 and the left press plate 432 and the right press plate 433 to achieve the effect of changing the width of the sewing groove 41, but since this structure is the prior art, no specific description will be given here.

[0046] Specifically, since the pocket fabric of jeans needs to be hemmed before being sewn to the leg fabric. Specifically, a hemming mechanism is used to perform the first hemming on the left and right sides and the lower side (the side away from the pocket opening) of the pocket fabric, and then the two corners at the pocket opening position are hemmed for the second time. This can make the pocket more beautiful after sewing. However, since the two corners at the pocket opening position have been hemmed twice, these two corners will be a little thicker than other positions, that is, the two sides of the pocket opening will be thicker than other positions, and the two side positions of the pocket opening are at both ends of the sewing groove 41 when the pocket fabric is sewn. Therefore, in order to prevent the sewing presser foot 23 from scratching the pocket fabric during the movement of the pressing component 4, it is necessary for the sewing presser foot 23 to automatically rise a certain distance when moving to the two ends of the sewing groove 41, so as to flatten the two corners at the pocket opening position correspondingly and avoid scratching the fabric. When the sewing presser foot 23 leaves the end of the sewing groove 41, the sewing presser foot 23 needs to automatically descend a certain distance to flatten the other positions of the pocket except the two corners of the pocket opening.

[0047] To solve the above problems, the specific usage method of the sewing presser foot 23 is as follows: when the sewing needle driving mechanism drives the sewing needle 22 to move up and down in the sewing groove 41 for sewing operations, the motor 25 drives the sewing presser foot 23 to move downward synchronously and flatten the pocket fabric, and the pressing driving mechanism drives the pressing component 4 to move in a U shape synchronously; when the sewing presser foot 23 moves to the end of the sewing groove 41, the motor 25 drives the sewing presser foot 23 to move upward a certain distance, and when the sewing presser foot 23 leaves the end of the sewing groove 41, the motor 25 drives the sewing presser foot 23 to move downward a certain distance. Specifically, for the distance that the motor 25 drives the sewing presser foot 23 to rise or fall each time, it can be set according to actual needs. For example, it can rise or fall 5 millimeters each time.

[0048] The following details the usage principle of the present invention for better understanding:

[0049] First, after placing the leg fabric on the workbench 1, a pocket fabric is hemmed; then, the first lifting and pressing cylinder 44 and the second lifting and pressing cylinder 45 drive the U-shaped pressing frame 42 and the auxiliary presser foot 43 to press the leg fabric and the pocket fabric correspondingly, and the pressing driving mechanism drives the fabric to move towards the sewing head 2 until one end of the sewing groove 41 is aligned with the sewing needle 22 and the sewing presser foot 23;

[0050] Then, the sewing needle driving mechanism drives the sewing needle 22 to move up and down, while the motor 25 drives the swing rod 242 to swing. Synchronously, the swing arm 241 and two first connecting rods 244 drive the transmission rod 243 to rotate a certain distance, and the transmission rod 243 drives the connecting rod 246 to move downward a certain distance through two second connecting rods 245, that is, the sewing presser foot 23 moves downward a certain distance, so that the sewing presser foot 23 flattens a corner at the mouth position of the pocket fabric; then the material pressing driving mechanism drives the material pressing assembly 4 to move in a U shape. When the sewing presser foot 23 leaves a corner at the mouth position of the pocket fabric, the motor 25 continues to drive the sewing presser foot 23 to move downward a certain distance, so that the sewing presser foot 23 continues to flatten the pocket fabric; when the sewing needle 22 and the sewing presser foot 23 move to the position of the other port of the sewing groove 41, the motor 25 drives the swing rod 242 to swing in the reverse direction. Synchronously, the swing arm 241 and two first connecting rods 244 drive the transmission rod 243 to rotate in the reverse direction a certain distance, and the transmission rod 243 drives the connecting rod 246 to move upward a certain distance through two second connecting rods 245, that is, the sewing presser foot 23 moves upward a certain distance, so that the sewing presser foot 23 will naturally flatten another corner at the mouth position of the pocket fabric when moving; then, when the sewing needle 22 and the sewing presser foot 23 move to the end, a stitch is completed; then, the auxiliary cylinder 46 drives the left pressing plate 432 and the right pressing plate 433 to move in the opposite direction to increase the width of the sewing groove 41, and the material pressing driving mechanism synchronously drives the material pressing assembly 4 to move a certain distance along the length direction of the pocket mouth (specifically, move in the direction close to the auxiliary presser foot 23), so that the sewing needle 22 enters the starting point of another U-shaped movement. Then, the material pressing driving mechanism drives the material pressing assembly 4 to move in a U shape again, so as to sew another stitch. Similarly, when the sewing presser foot 23 leaves the mouth position of the pocket fabric, the motor 25 continues to drive the sewing presser foot 23 to move downward a certain distance, so that the sewing presser foot 23 continues to flatten the pocket fabric, and when the sewing needle 22 and the sewing presser foot 23 move to the position of the other port of the sewing groove 41, the motor 25 continues to drive the sewing presser foot 23 to move upward a certain distance, so that the sewing presser foot 23 will naturally flatten another corner at the mouth position of the pocket fabric when moving; then, when the sewing needle 22 and the sewing presser foot 23 move to the end, the material pressing driving mechanism synchronously drives the material pressing assembly 4 to move a certain distance along the length direction of the pocket mouth (specifically, move in the direction away from the auxiliary presser foot), so that the two stitches are connected together; finally, after cutting the stitch, the material pressing device sends the sewn workpiece to the next process, and all components return to their original positions.

[0051] Refer to Figures 1 - 7 In addition, the present invention also provides a sewing method for the material pressing device of a patch pocket machine and the sewing head of the patch pocket machine. The structure of the material pressing device of the patch pocket machine and the sewing head described above is adopted, and the method includes the following steps:

[0052] S1. Stack the corresponding pocket fabric that has been hemmed on the leg fabric of the jeans on the workbench 1;

[0053] S2. The material pressing drive mechanism drives the material pressing assembly 4 to move above the fabric. The first lifting and pressing cylinder 44 and the second lifting and pressing cylinder 45 drive the U-shaped pressing frame 42 and the auxiliary presser foot 43 to press the leg fabric and the pocket fabric, and drag the leg fabric and the pocket fabric towards the sewing head 2 through the material pressing drive mechanism until the sewing needle 22 and the sewing presser foot 23 are aligned with one end of the sewing groove 41;

[0054] S3. When the sewing needle drive mechanism drives the sewing needle 22 to move up and down in the sewing groove 41 and cooperate with a rotary hook (not shown in the figure) for sewing, the motor 25 drives the sewing presser foot 23 to move downward synchronously and flatten one corner of the pocket fabric. At the same time, the material pressing drive mechanism drives the material pressing assembly 4 to move in a U-shape, so that the sewing needle 22 and the sewing presser foot 23 move relative to the material pressing assembly 4 from the side close to the material pressing assembly 4 at one end of the sewing groove 41 to the other end and realize continuous sewing operation; when the sewing presser foot 23 leaves the end of the sewing groove 41, the motor 25 drives the sewing presser foot 23 to move downward by a certain distance. At this time, since one corner of the bag mouth position is left, the sewing presser foot 23 needs to be moved downward, so as to better flatten the pocket fabric;

[0055] S4. When the sewing needle 22 and the sewing presser foot 23 move to the other end of the sewing groove 41, the motor 25 drives the sewing presser foot 23 to move upward by a certain distance, so as to flatten this corner. At this time, since the sewing needle 22 starts to sew the corner of the bag mouth position and the thickness of this corner is relatively large, the sewing presser foot 23 needs to be moved upward by a certain distance to prevent the sewing presser foot 23 from directly scratching or even tearing the pocket fabric; when the sewing needle 22 and the sewing presser foot 23 move to the end (that is, the sewing needle 22 has reached the maximum sewing position towards the bag mouth direction), a stitch is completed. Then, the auxiliary cylinder 46 drives the left pressing plate 432 and the right pressing plate 433 to move in opposite directions to make the width of the sewing groove 41 larger; then, the material pressing drive mechanism continues to drive the material pressing assembly 4 to move, so that the sewing needle 22 and the sewing presser foot 23 move relative to the material pressing assembly 4 towards the direction close to the auxiliary presser foot 43 by a certain distance (actually move along the length direction of the bag mouth), and then move in a U-shape towards the other end of the sewing groove 41; similarly, when the sewing presser foot 23 leaves the end of the sewing groove 41, the motor 25 drives the sewing presser foot 23 to move downward by a certain distance;

[0056] S5. Similarly, when the sewing needle 22 and the sewing presser foot 23 move to the other end of the sewing groove 41, the motor 25 drives the sewing presser foot 23 to move upward by a certain distance, so as to flatten another corner; finally, when the sewing needle 22 and the sewing presser foot 23 move to the end (that is, the sewing needle 22 has reached the maximum sewing position in the direction of the bag mouth), the material pressing drive mechanism continues to drive the material pressing assembly 4 to move, so that the sewing needle 22 and the sewing presser foot 23 move a certain distance relative to the material pressing assembly 4 in the direction away from the auxiliary presser foot 43 (actually move along the length direction of the bag mouth);

[0057] S6. After the two ends of the two U-shaped sewing threads are respectively connected, cut the sewing threads;

[0058] S7. The material pressing device sends the sewn trouser leg fabric and the pocket fabric to the next step.

[0059] In addition, in order to ensure the accuracy of the moving distance of the sewing presser foot 23 and avoid the inability to achieve automatic sewing during the sewing process, in step S4 and step S5, when the sewing needle 22 and the sewing presser foot 23 move to the end of the sewing groove 41, the upward moving distance of the sewing presser foot 23 is calculated by the control system, and when the sewing needle 22 and the sewing presser foot 23 leave the end of the sewing groove 41, the downward moving distance of the sewing presser foot 23 is also calculated by the control system, so as to ensure the integrity of the fabric.

[0060] The present invention is not limited to the above embodiments. If various changes or deformations of the present invention do not depart from the spirit and scope of the present invention, and if these changes and deformations belong to the scope of the claims of the present invention and equivalent technical scope, then the present invention also intends to include these changes and deformations.

Claims

1. A material pressing device and sewing head structure of a patch pocket machine, characterized in that: It includes a material pressing device and a sewing head respectively installed on a workbench; The material pressing device includes a material pressing driving mechanism installed on the workbench, a conveying frame installed on the output end of the material pressing driving mechanism, and a material pressing component installed on the conveying frame; the material pressing component can be used to press the pocket fabric on the workbench, and a U-shaped sewing groove is provided on the material pressing component, and the material pressing driving mechanism can be used to drive the material pressing component to move in the front-back and left-right directions; The sewing head includes a machine shell installed on the workbench, a sewing needle movably installed up and down at the front end of the machine shell, a sewing needle driving mechanism for driving the sewing needle to move up and down, a sewing presser foot movably installed up and down at the front end of the machine shell and sleeved on the sewing needle, and a motor for driving the sewing presser foot to move up and down through a transmission component; the sewing needle and the sewing presser foot can be correspondingly inserted into the sewing groove for sewing operations; The material pressing component includes a U-shaped pressing frame, an auxiliary presser foot, and a first lifting and pressing air cylinder and a second lifting and pressing air cylinder respectively installed on the conveying frame; the auxiliary presser foot is installed in the hollow part of the U-shaped pressing frame; the auxiliary presser foot includes a fixing plate, a left pressing plate and a right pressing plate symmetrically arranged on both sides below the fixing plate, and an auxiliary air cylinder installed on the fixing plate for driving the left pressing plate and the right pressing plate to move in opposite or away directions; a U-shaped sewing groove is formed between the outer sides of the left pressing plate and the right pressing plate and the inner side of the U-shaped pressing frame; when the auxiliary air cylinder drives the left pressing plate and the right pressing plate to move in opposite directions, the width of the sewing groove becomes larger; when the auxiliary air cylinder drives the left pressing plate and the right pressing plate to move in away directions, the width of the sewing groove becomes smaller; both ends of the U-shaped pressing frame are respectively connected to the output shaft of one of the first lifting and pressing air cylinders, and the first lifting and pressing air cylinder is used to drive the U-shaped pressing frame to move up and down; the output shaft of the second lifting and pressing air cylinder is connected to the fixing plate, and the second lifting and pressing air cylinder is used to drive the auxiliary presser foot to move up and down; When the sewing needle driving mechanism drives the sewing needle to move up and down in the sewing groove for sewing operations, the motor drives the sewing presser foot to move downward synchronously and presses the pocket fabric flat, and the material pressing driving mechanism drives the material pressing component to move in a U-shaped motion; when the sewing presser foot moves to the end of the sewing groove, the motor drives the sewing presser foot to move upward by a certain distance, and when the sewing presser foot leaves the end of the sewing groove, the motor drives the sewing presser foot to move downward by a certain distance.

2. The material pressing device and sewing head structure of a patch pocket machine according to claim 1, characterized in that: The transmission assembly includes a swing arm, a swing rod, a transmission rod, a first link assembly, and a second link assembly; one end of the swing arm is hinged to the machine housing; one end of the swing rod is eccentrically hinged to the output shaft of the motor, the other end of the swing rod is coaxially hinged to the other end of the swing arm and one end of the first link assembly, the other end of the first link assembly is fixedly connected to the transmission rod horizontally and rotatably mounted on the machine housing; one end of the second link assembly is hinged to the upper end of the sewing presser foot, and the other end of the second link assembly is fixedly connected to the transmission rod.

3. The pressing device and sewing head structure of the patch pocket machine according to claim 2, characterized in that: The first link assembly includes two first links hinged to each other at one end; the other end of the first first link is coaxially hinged to the swing rod and the swing arm; the other end of the second first link is fixedly connected to the transmission rod; the second link assembly includes two second links hinged to each other at one end; the other end of the first second link is hinged to the upper end of the sewing presser foot; the other end of the second second link is fixedly connected to the transmission rod.

4. The pressing device and sewing head structure of the patch pocket machine according to claim 3, characterized in that: A connecting rod is connected between the other end of the first second link and the sewing presser foot, and the other end of the first second link is hinged to the upper end of the connecting rod, and the lower end of the connecting rod is fixedly connected to the upper end of the sewing presser foot.

5. The pressing device and sewing head structure of the patch pocket machine according to claim 2, characterized in that: One end of the swing rod is eccentrically hinged to the output shaft of the motor through an eccentric rod; one end of the eccentric rod is hinged to the swing rod, and the other end is fixedly connected to the output shaft of the motor.

6. The pressing device and sewing head structure of the patch pocket machine according to claim 2, characterized in that: One end of the swing arm is hinged to the machine housing through a positioning rod; the positioning rod is fixed on the machine housing, and one end of the swing arm is rotatably sleeved on the positioning rod.

7. A pressing device of a patch pocket machine and a sewing method of a sewing head, characterized in that, Adopting the pressing device and sewing head structure of the patch pocket machine according to any one of claims 1-6, the following steps are included: S1. Stack the corresponding pocket fabric after hemming on the leg fabric of the jeans on the workbench. S2. The pressing drive mechanism drives the pressing assembly to move above the fabric, the first lifting and pressing cylinder and the second lifting and pressing cylinder drive the U-shaped pressing frame and the auxiliary presser foot to press the leg fabric and the pocket fabric, and the leg fabric and the pocket fabric are dragged by the pressing drive mechanism to move towards the sewing head until the sewing needle and the sewing presser foot are aligned with one end of the sewing groove. When the sewing needle driving mechanism drives the sewing needle to move up and down in the sewing groove and cooperate with a rotating shuttle for sewing, the motor drives the sewing presser foot to move downward synchronously to flatten the pocket fabric. At the same time, the presser material driving mechanism drives the presser material assembly to move in a U shape, so that the sewing needle and the sewing presser foot move relative to the presser material assembly from the side close to the presser material assembly at one end of the sewing groove to the other end to achieve continuous sewing operations; when the sewing presser foot leaves the end of the sewing groove, the motor drives the sewing presser foot to move downward by a certain distance; S4. When the sewing needle and the sewing presser foot move to the other end of the sewing groove, the motor drives the sewing presser foot to move upward by a certain distance, and when the sewing needle and the sewing presser foot move to the end, the auxiliary air cylinder drives the left pressing plate and the right pressing plate to move in opposite directions to increase the width of the sewing groove; Then, the presser material driving mechanism continues to drive the presser material assembly to move, so that the sewing needle and the sewing presser foot move relative to the presser material assembly by a certain distance in the direction close to the auxiliary presser foot, and then move in a U shape to the other end of the sewing groove; when the sewing presser foot leaves the end of the sewing groove, the motor drives the sewing presser foot to move downward by a certain distance; S5. When the sewing needle and the sewing presser foot move to the other end of the sewing groove, the motor drives the sewing presser foot to move upward by a certain distance; when the sewing needle and the sewing presser foot move to the end, the presser material driving mechanism continues to drive the presser material assembly to move, so that the sewing needle and the sewing presser foot move relative to the presser material assembly by a certain distance in the direction away from the auxiliary presser foot; S6. After the two ends of the two U-shaped sewing threads are respectively connected, cut the sewing thread; S7. The presser device sends the sewn trouser leg fabric and pocket fabric to the next step.

8. The sewing method of the presser device and the sewing head of the pocket attaching machine according to claim 7, characterized in that: In step S4 and step S5, when the sewing needle and the sewing presser foot move to the end of the sewing groove, the distance that the sewing presser foot moves upward is calculated by the control system; and when the sewing needle and the sewing presser foot leave the end of the sewing groove, the distance that the sewing presser foot moves downward is also calculated by the control system.

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