A multifunctional pneumatic folding mechanism and lace sewing device

Abstract

The present invention provides a multifunctional pneumatic folding mechanism and a lace sewing device, which belong to the field of cloth processing equipment. The multi-kinetic energy pneumatic folding mechanism includes: a push folding component, which pushes and shovels the cloth along the moving direction of the cloth to form folds; a rotary cylinder, which is used to drive the push folding component to rotate intermittently to form folds on the cloth; and a control component, which is used to control the rotation parameters of the rotary cylinder to adjust the spacing between adjacent folds. The pneumatic folding mechanism of the present invention controls the rotation of the rotary cylinder through a controller, thereby driving the push folding component to form folds on the cloth. When in use, the spacing between adjacent folds can be adjusted by adjusting the corresponding parameter value through the controller, which effectively avoids the waste of time and energy, and can ensure that the folds are uniform in size and the finished product is of high quality. The lace sewing device of the present invention includes a sewing machine body and the multifunctional pneumatic folding mechanism, and the multifunctional pneumatic folding mechanism is arranged on the side of the sewing machine body opposite to the operator.

Description

Technical Field

[0001] The present invention belongs to the field of cloth pleating equipment, and in particular relates to a multifunctional pneumatic pleating mechanism. In addition, the present invention also relates to a lace sewing device comprising the multifunctional pneumatic pleating mechanism. Background Art

[0002] At present, fabric lace is generally made by manually folding the fabric and then sewing it with a sewing machine. However, with the increasing automation of clothing processing and fabric processing, the transmission lace folding method can no longer meet the demand.

[0003] For this reason, lace folding machines have appeared on the market, but existing folding machines widely use gears or synchronous wheels, which means that when adjusting the distance between folds in a large range, professional mechanics must replace the corresponding gears to complete the debugging, resulting in a large waste of time, energy and resources; in addition, when the gear ratio is large, the movement range of the folding shovel will become larger accordingly, and then exceed the limited working surface, resulting in uneven size of the folds or the inability to fold. Summary of the invention

[0004] Based on the above background issues, the present invention aims to provide a multifunctional pneumatic folding mechanism, which can adjust the distance between folds by adjusting parameter values ​​through a controller, thereby solving the defects of complex adjustment and low efficiency in the prior art and effectively improving work efficiency; another object of the present invention is to provide a lace sewing device including the above-mentioned multifunctional pneumatic folding mechanism.

[0005] In order to achieve the above object, the technical solution provided by the present invention is:

[0006] A multifunctional pneumatic folding mechanism is characterized in that it includes: a pushing and folding component, which pushes and shovels the cloth along the moving direction of the cloth to form folds; a rotating cylinder, which is used to drive the pushing and folding component to rotate intermittently to form folds on the cloth; and a control component, which is used to control the rotation parameters of the rotating cylinder to adjust the spacing between adjacent folds.

[0007] Wherein, the rotation output end of the rotary cylinder is coaxially connected with a main shaft, and the push-folding assembly is connected to an end of the main shaft away from the rotary cylinder.

[0008] The pushing and folding assembly comprises one or two of: an upper pushing member, which pushes and shovels the cloth upward from the bottom of the cloth to form a forward fold in the same direction as the cloth moving direction; and a lower pushing member, which pushes and shovels the cloth downward from the top of the cloth to form a reverse fold in the opposite direction of the cloth moving direction.

[0009] In one embodiment, the upper push member includes a lower swing arm connected to the main shaft, an upper push shovel frame connected to the lower swing arm through a lower secondary shaft, and an upper push shovel skin arranged on the side of the upper push shovel frame away from the lower secondary shaft; the lower push member includes an upper swing arm connected to the main shaft, a lower push shovel frame connected to the upper swing arm through an upper secondary shaft, and a lower push shovel skin arranged on the side of the lower push shovel frame away from the upper secondary shaft.

[0010] Preferably, the upper swing arm is a long strip structure, one side of which is connected to the main shaft and the other side is connected to the upper secondary shaft, and the extension direction of the upper secondary shaft is perpendicular to the extension direction of the upper swing arm; the lower swing arm has the same structure as the upper swing arm, and the lower swing arm and the upper swing arm are staggered along the axial direction of the main shaft.

[0011] Preferably, the upper push member further comprises a first elastic member connected to the upper push shovel frame for pushing the upper push member to return; the lower push member further comprises a second elastic member connected to the lower push shovel frame for pushing the lower push member to return.

[0012] The rotating cylinder is connected to the air compressor through a pipeline, and a double-headed two-position five-way solenoid valve is also arranged on the pipeline; the pipeline includes two air pipes, and one end of each air pipe connected to the rotating cylinder is connected to a throttle valve.

[0013] Among them, the control component includes: a sensor for sensing the needle position of an external sewing machine body; a controller, which is electrically connected to the sensor and a double-headed two-position five-way solenoid valve, respectively, for receiving signals from the sensor and controlling the start and stop of the double-headed two-position five-way solenoid valve to control the forward and reverse rotation angles of the rotating cylinder.

[0014] In one embodiment, the sensor includes a magnet block arranged on a rotating wheel of an external sewing machine body, and a Hall element arranged directly above the rotating wheel. When the rotating wheel drives the magnet block to rotate to the highest point, the magnet block triggers the Hall element. The controller is provided with an operating panel for setting the number of sewing needles. When the triggering number of the Hall element is the same as the set number of sewing needles, the controller receives the signal transmitted by the Hall element and controls the start and stop of the double-headed two-position five-way solenoid valve.

[0015] In order to achieve the above-mentioned purpose, the present invention also provides a lace sewing device, including a sewing machine body and the above-mentioned multifunctional pneumatic folding mechanism, wherein the multifunctional pneumatic folding mechanism is arranged on the side of the sewing machine body opposite to the operator through a mounting part, and along the moving direction of the fabric, the pushing and folding component of the multifunctional pneumatic folding mechanism is on the same horizontal line as the needle of the sewing machine body.

[0016] Compared with the prior art, the present invention has the following effects:

[0017] 1. The present invention controls the rotation of the rotary cylinder through a controller, thereby driving the push-folding assembly to form folds on the cloth. When in use, the spacing between adjacent folds can be adjusted by adjusting the corresponding parameter values ​​through the controller, which effectively avoids the waste of time and energy, and can ensure that the folds are uniform in size and the finished product is of high quality.

[0018] 2. The push-folding assembly of the present invention includes one or both of an upper push member and a lower push member. When only the upper push member is provided, a forward fold can be formed on the fabric. When only the lower push member is provided, a reverse fold can be formed on the fabric. When both the upper push member and the lower push member are provided, an I-shaped fold can be formed on the fabric. That is, the present invention can realize making three types of lace folds with one set of equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for describing the embodiments are briefly introduced below.

[0020] Figure 1 This is a schematic structural diagram of the multifunctional pneumatic folding mechanism in Example 1 of the present invention;

[0021] Figure 2 It is a structural schematic diagram of the multifunctional pneumatic folding mechanism in Embodiment 1 of the present invention from another perspective;

[0022] Figure 3 It is a structural schematic diagram of the push-folding assembly in Embodiment 1 of the present invention;

[0023] Figure 4 It is a schematic diagram of the structure of the push-folding assembly in Embodiment 2 of the present invention;

[0024] Figure 5 It is a structural schematic diagram of the push-folding assembly in Embodiment 3 of the present invention;

[0025] Figure 6 is a side view of a lace sewing device in embodiment 4 of the present invention;

[0026] Figure 7 It is a top view of the lace sewing device in embodiment 4 of the present invention. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] In the description of the present invention, it should be noted that the terms "first" and "second" are only for the convenience of description and cannot be understood as indicating or implying relative importance.

[0029] In order to solve the problems existing in the existing folding machines that use gears or synchronous wheels to adjust the folding spacing, the present invention provides a pneumatic folding mechanism, such as Figure 1 and 2 As shown, it includes: a pushing and folding component, which pushes and shovels the cloth along the moving direction of the cloth to form folds; a rotating cylinder 1, which is used to drive the pushing and folding component to rotate intermittently to form folds on the cloth; and a control component, which is used to control the rotation parameters of the rotating cylinder 1 to adjust the spacing between adjacent folds. The present invention controls the rotation of the rotating cylinder 1 through a controller, thereby driving the pushing and folding component to form folds on the cloth. When in use, the spacing between adjacent folds can be adjusted by adjusting the corresponding parameter value through the controller, which effectively avoids the waste of time and energy, and can ensure that the folds are uniform in size and the finished product is of high quality.

[0030] Next, the present invention is described in detail through specific embodiments.

[0031] Example 1

[0032] A multifunctional pneumatic folding mechanism, such as Figure 1-3 As shown, it includes an upper push member, a lower push member, a rotary cylinder 1, and a control component. The rotation output end of the rotary cylinder 1 is coaxially connected to a main shaft 101. The upper push member and the lower push member are connected to the side of the main shaft 101 away from the rotary cylinder 1. Figure 3 That is, the upper push member and the lower push member are connected to the left side of the main shaft 101.

[0033] In this embodiment, if Figure 3 As shown, the push-down member includes an upper swing arm 201 connected to the main shaft 101, a lower push shovel frame 203 connected to the upper swing arm 201 through an upper secondary shaft 202, and an upper push shovel skin 204 arranged on the side of the lower push shovel frame 203 away from the upper secondary shaft 202. Specifically, the upper swing arm 201 is a long strip structure, and its front side is sleeved on the main shaft 101. When the rotating cylinder 1 drives the main shaft 101 to rotate, it can drive the upper swing arm 201 to rotate synchronously. The rear side of the upper swing arm 201 is vertically connected to the upper secondary shaft 202. The lower push shovel frame 203 is sleeved on the upper secondary shaft 202 through a sleeve extending from the front end, that is, the lower push shovel frame 203 can rotate around the upper secondary shaft 202, and the left and right ends of the sleeve are fixed by shaft sleeves. In order to enable the push-down member to move up and down flexibly, the upper push member also includes a first elastic member 205, such as Figure 3As shown, one end of the first elastic member 205 is fixed on the upper shovel frame 203, and the other end is connected to the sewing machine body described later, so that when the rotary cylinder 1 rotates counterclockwise to drive the lower push member to move downward, the first elastic member 205 can give the upper push member an upward rebound force to help the upper push member to return. The lower push member can push the shovel cloth downward from above the cloth, thereby forming a reverse fold opposite to the moving direction of the cloth.

[0034] In this embodiment, if Figure 3 As shown, the upper push member includes a lower swing arm 301 connected to the main shaft 101, an upper push shovel frame 303 connected to the lower swing arm 301 through a lower secondary shaft 302, and an upper push shovel skin 304 arranged on the side of the upper push shovel frame 303 away from the lower secondary shaft 302. Specifically, the lower swing arm 301 is arranged on the left side of the upper swing arm 201, and the lower swing arm 301 is a long strip structure, and its rear side is sleeved on the main shaft 101. When the rotating cylinder 1 drives the main shaft 101 to rotate, it can drive the lower swing arm 301 to rotate synchronously. The front side of the lower swing arm 301 is vertically connected to the lower secondary shaft 302, and the upper push shovel frame 303 is sleeved on the lower secondary shaft 302 through a sleeve extending from the front end, that is, the upper push shovel frame 303 can rotate around the lower secondary shaft 302, and the left and right ends of the sleeve are fixed by shaft sleeves. In order to enable the upper push member to move up and down flexibly, the upper push member also includes a second elastic member 305, such as Figure 3 As shown, one end of the second elastic member 205 is fixed on the lower support plate 306 described later, and the other end is connected to the first L-shaped fixing plate 502 described later, so that when the rotary cylinder 1 rotates clockwise to drive the upper push member to move upward, the second elastic member 205 can give the upper push member a downward rebound force, which helps the lower push member to return.

[0035] In specific use, the cloth is set between the upper push member and the lower push member, more specifically, between the lower push shovel skin 204 and the upper push shovel skin 304. When the cloth moves, in order to prevent the cloth from shifting left and right, the upper push shovel frame 303 is also provided with a cloth limiting unit, such as Figure 3 As shown, it includes a lower support plate 306 extending axially along the lower secondary shaft 302, and an upper clamping piece 307 slidably connected to the lower support plate 306. The upper clamping piece 307 is slidably arranged along the extension direction of the lower support plate 306, and the position can be adjusted according to the size of the cloth. When in use, the cloth is passed through the gap between the upper clamping piece 307 and the lower support plate 306, and the upper clamping piece 307 can be used to form a limit. The cloth can be pushed upward from the bottom of the cloth through the upper push piece to form a forward fold in the same direction as the cloth movement. In this embodiment, the upper push piece and the lower push piece can be reciprocated at intervals to form an I-shaped fold on the cloth.

[0036] In this embodiment, if Figure 1 and 2As shown, the rotary cylinder 1 is connected to the air compressor through a pipeline, and a double-headed two-position five-way solenoid valve 4 is also provided on the pipeline; specifically, the pipeline includes two air pipes 401, and one end of each air pipe 401 connected to the rotary cylinder 1 is connected to a throttle valve 402. It should be noted that the specific model of the double-headed two-position five-way solenoid valve used in this embodiment is 4v220-08 DC24v, which is an existing product, and its specific working principle and structure are not described in detail in this embodiment.

[0037] In order to be fixed with the sewing machine body described later, the pneumatic folding mechanism also includes a mounting member, such as Figure 1 and 2 As shown, the mounting member includes a first bracket and a second bracket respectively arranged on the left and right sides of the rotating cylinder 1. Specifically, the first bracket includes a first vertical axis 501 connected to the main shaft 101, and a first L-shaped fixing plate 502 vertically connected to the top of the first vertical axis 501. The first vertical axis 501 is arranged between the push-up member and the left end face of the rotating cylinder 1. The bottom end of the first vertical axis 501 is sleeved on the main shaft 101 through a shaft sleeve. In order to ensure the smooth rotation of the main shaft 101, a bearing is also arranged in the shaft sleeve; the rear end face of the first L-shaped fixing plate 502 is fixed to the sewing machine body described later.

[0038] The second bracket is arranged on the right side of the rotary cylinder 1, and includes a second vertical shaft 503 connected to the main shaft 101, and a second L-shaped fixing plate 504 vertically connected to the top of the second vertical shaft 503. The second bracket has the same structure as the first bracket.

[0039] In order to realize the rotation control of the rotating cylinder 1, the control component includes: a sensor for sensing the needle position of the external sewing machine body; a controller, which is electrically connected to the sensor and the double-headed two-position five-way solenoid valve 401 respectively, for receiving the signal of the sensor and controlling the start and stop of the double-headed two-position five-way solenoid valve 401 to control the forward and reverse rotation angles of the rotating cylinder 1.

[0040] In this embodiment, if Figure 7 As shown, the sensor includes a magnet block arranged on the rotating wheel 601 of the external sewing machine body 6, and a Hall element 7 arranged just above the rotating wheel 601. The rotating wheel 601 rotates one circle to drive the needle to move up and down one round. When the rotating wheel 601 drives the magnet block to rotate to the highest point, the needle is at the highest point. At this time, the magnet block on the rotating wheel 601 triggers the Hall element 7 and counts. In specific use, the distance between the magnet block and the Hall element 7 is set to 2-3mm, that is, when the rotating wheel 601 drives the magnet block to be at the highest point, the distance between the magnet block and the Hall element 7 is 2-3mm.

[0041] In the present embodiment, the controller is a PLC controller with a built-in preset program and an operation panel for the user to adjust parameters. In specific use, parameters y1 and y2 can be set. y1 represents the number of sewing needles for the reverse fold, and y2 represents the number of sewing needles for the forward fold. The spacing between adjacent folds of the I-shaped fold can be adjusted by adjusting the values ​​of y1 and y2 on the operation panel. When in use, place the cloth between the upper push member and the lower push member. In the initial state, the lower push shovel skin 204 of the lower push member pushes the cloth to form a reverse fold. If y1=4 and y2=4 are set, the wheel 601 of the sewing machine body 6 rotates 4 circles, the needle moves back and forth four times up and down and completes four sewing needles on the reverse fold formed. At this time, the parameter y1 is executed. When the wheel 601 of the sewing machine body 6 rotates to the 4th circle, the magnet block rotates to the highest point and triggers the Hall element 7. The Hall element 7 transmits the signal to the controller, and the control The controller controls the relay on the right side of the double-headed two-position five-way solenoid valve 401 to start, thereby controlling the rotary cylinder 1 to rotate clockwise to the set angle. At this time, the lower pushing shovel skin 204 of the lower pushing member is away from the surface of the cloth, and the upper pushing shovel skin 304 of the upper pushing member pushes the cloth upward from the bottom of the cloth to form a forward fold, that is, the execution of parameter y2 begins. The execution process of parameter y2 is: the rotating wheel 601 of the sewing machine body 6 rotates 4 circles, the machine needle moves back and forth four times up and down and completes four sewing stitches on the forward fold, and at this time, an eight-needle I-shaped fold is completed.

[0042] When parameter y2 is executed, that is, when the wheel 601 of the sewing machine body 6 rotates to the 4th circle, the magnet block rotates to the highest point and triggers the Hall element 7. The Hall element 7 transmits the signal to the controller. The controller controls the relay on the left side of the double-headed two-position five-way solenoid valve 401 to start, thereby controlling the rotary cylinder 1 to rotate counterclockwise to the set angle. At this time, the upper pushing shovel skin 304 of the upper pushing member is away from the surface of the cloth, and the lower pushing shovel skin 204 of the lower pushing member pushes the cloth downward from the top of the cloth to form a reverse fold. This cycle can complete the lace processing.

[0043] It should be noted that the settings of the parameters y1 and y2 are not limited to the specific setting values ​​of this embodiment. The maximum setting value of y1 and y2 can be 99999, and the minimum setting value can be 1.

[0044] Example 2

[0045] A pneumatic folding mechanism, such as Figure 4 As shown, it includes a push-down member, a rotary cylinder 1, and a control component. The rotation output end of the rotary cylinder 1 is coaxially connected to the main shaft 101, and the push-down member is connected to the side of the main shaft 101 away from the rotary cylinder 1. The specific structure is the same as that of Example 1.

[0046] The pneumatic folding mechanism of this embodiment can form a reverse fold on the fabric. Since this embodiment does not have an upper push member, the parameter y2 is the number of pause sewing stitches of the lower push member. For example, y1=3, y2=5 are set. In the initial state, the lower push shovel skin 204 of the lower push member pushes the fabric downward from the top of the fabric to form a reverse fold. The wheel 601 of the sewing machine body 6 rotates 3 circles, the needle moves back and forth three times and completes three sewing stitches on the formed reverse fold. At this time, the parameter y1 is executed. When the wheel of the sewing machine body rotates to the third circle, the magnetic The iron block rotates to the highest point and triggers the Hall element 7, which transmits the signal to the controller. The controller controls the relay on the right side of the double-headed two-position five-way solenoid valve 401 to start, thereby controlling the rotary cylinder 1 to rotate clockwise to the set angle. At this time, the push-down shovel skin 204 of the push-down member is away from the surface of the cloth, and the cloth-pushing action is stopped, that is, the execution of parameter y2 begins. The execution process of parameter y2 is: the wheel of the sewing machine body rotates 5 circles, the needle moves back and forth five times up and down and completes five sewing stitches on the cloth, and an eight-stitch-one-fold reverse fold is completed.

[0047] When parameter y2 is executed, that is, when the wheel of the sewing machine body rotates to the 5th circle, the magnet block rotates to the highest point and triggers the Hall element 7. The Hall element 7 transmits the signal to the controller. The controller controls the relay on the left side of the double-headed two-position five-way solenoid valve 401 to start, thereby controlling the rotary cylinder 1 to rotate counterclockwise to the set angle. At this time, the push-down shovel skin 204 of the push-down member pushes the cloth downward from the top of the cloth to form a reverse fold, and the lace processing can be completed in this cycle.

[0048] Example 3

[0049] A pneumatic folding mechanism, such as Figure 5 As shown, it includes a push-up member, a rotary cylinder 1, and a control component. The rotation output end of the rotary cylinder 1 is coaxially connected to the main shaft 101, and the push-up member is connected to the side of the main shaft 101 away from the rotary cylinder 1. The specific structure is the same as that of Example 1.

[0050] The pneumatic pleating mechanism of this embodiment can form a forward fold on the fabric. Since this embodiment does not have an upper push member, the parameter y2 is the number of rest sewing stitches of the lower push member. For example, y1=8, y2=2 are set. In the initial state, the upper push shovel skin 304 of the upper push member pushes the fabric to form a forward fold, the wheel of the sewing machine body rotates 8 times, the needle moves up and down eight times and completes eight sewing stitches on the formed forward fold. At this time, the parameter y1 is executed. When the wheel 601 of the sewing machine body 6 rotates to the 8th circle, the magnet block rotates to the maximum. The high position triggers the Hall element 7, which transmits the signal to the controller. The controller controls the relay on the left side of the double-headed two-position five-way solenoid valve 401 to start, thereby controlling the rotary cylinder 1 to rotate counterclockwise to the set angle. At this time, the upper pushing shovel skin 304 of the upper pushing member is away from the surface of the cloth, and the pushing and shoveling action of the cloth is stopped, that is, the execution of parameter y2 is started. The execution process of parameter y2 is: the rotating wheel 601 of the sewing machine body 6 rotates 2 circles, the needle moves back and forth up and down twice and completes two sewing stitches on the cloth. At this time, a ten-stitch-one-fold forward fold is completed.

[0051] When parameter y2 is executed, that is, when the wheel 601 of the sewing machine body 6 rotates to the second circle, the magnet block rotates to the highest point and triggers the Hall element 7. The Hall element 7 transmits the signal to the controller. The controller controls the relay on the right side of the double-headed two-position five-way solenoid valve 401 to start, thereby controlling the rotary cylinder 1 to rotate clockwise to the set angle. At this time, the upper shovel skin 304 of the upper push piece pushes the cloth upward from the bottom of the cloth to form a forward fold, and the lace processing can be completed in this cycle.

[0052] Example 4

[0053] A lace sewing device, such as Figure 6 and 7 As shown, it includes a sewing machine body 6 and the multifunctional pneumatic folding mechanism in Example 1, wherein the pneumatic folding mechanism is arranged on the side of the sewing machine body 6 opposite to the operator through a mounting member, and specifically, the first L-shaped fixing plate 502 and the second L-shaped fixing plate 504 are fixed to the sewing machine body through fasteners such as bolts. Figure 7 As shown, along the moving direction of the cloth 100, the push-folding assembly of the pneumatic folding mechanism and the needle of the sewing machine body are on the same horizontal line.

[0054] When using, Figure 7 As shown, the cloth is passed through the gap between the upper clamp 307 and the lower support plate 306 so that the cloth 100 is located between the lower shovel skin 204 and the upper shovel skin 304, and then the parameters y1 and y2 are set on the operation panel of the controller, and then the sewing machine body 6 is started to perform lace processing. During the processing, the cloth 100 moves from the right to the left.

[0055] It should be noted that the specific model of the rotary cylinder 1 involved in the above embodiment is msqb20a, which is an existing product. Therefore, the specific structure and working principle thereof will not be described in detail in the present invention.

[0056] It should be pointed out that a person skilled in the art can make several modifications and improvements without departing from the inventive concept of the present invention, and these modifications and improvements all fall within the protection scope of the present invention.

Claims

1. A multifunctional pneumatic folding mechanism, characterized in that: include: A pushing and folding component pushes and shovels the cloth along the cloth moving direction to form folds; A rotary cylinder is used to drive the push-folding assembly to intermittently reciprocate to form folds on the fabric; A control component, used for controlling the rotation parameters of the rotary cylinder to adjust the spacing between adjacent folds; The rotation output end of the rotary cylinder is coaxially connected with a main shaft, and the push-folding assembly is connected to an end of the main shaft away from the rotary cylinder; The push-folding assembly comprises: An upward pusher pushes the cloth upward from the bottom of the cloth to form a fold in the same direction as the cloth movement; A push-down member pushes the cloth downward from above the cloth to form a reverse fold in the opposite direction of the cloth movement; The push-up member includes a lower swing arm connected to the main shaft, an upper push shovel frame connected to the lower swing arm through a lower secondary shaft, and an upper push shovel skin arranged on a side of the upper push shovel frame away from the lower secondary shaft; The push-down member includes an upper swing arm connected to the main shaft, a lower push shovel frame connected to the upper swing arm through an upper secondary shaft, and a lower push shovel skin arranged on a side of the lower push shovel frame away from the upper secondary shaft; The upper shovel frame is also provided with a material distribution limiting unit, which includes a lower support plate extending axially along the lower secondary shaft, and an upper clamping piece slidably connected to the lower support plate, and the upper clamping piece is slidably arranged along the extension direction of the lower support plate.

2. The multifunctional pneumatic folding mechanism according to claim 1, characterized in that: The upper swing arm is a long strip structure, one side of which is connected to the main shaft and the other side is connected to the upper secondary shaft. The extension direction of the upper secondary shaft is perpendicular to the extension direction of the upper swing arm. The lower swing arm has the same structure as the upper swing arm, and the lower swing arm and the upper swing arm are staggered along the axial direction of the main shaft.

3. The multifunctional pneumatic folding mechanism according to claim 1, characterized in that: The upper push member also includes a first elastic member connected to the upper push shovel frame for pushing the upper push member to return; the lower push member also includes a second elastic member connected to the lower push shovel frame for pushing the lower push member to return.

4. The multifunctional pneumatic folding mechanism according to claim 1, characterized in that: The rotary cylinder is connected to the air compressor through a pipeline, and a double-head two-position five-way solenoid valve is also provided on the pipeline; The pipeline comprises two air pipes, and one end of each air pipe connected to the rotating cylinder is connected to a throttle valve.

5. The multifunctional pneumatic folding mechanism according to claim 4, characterized in that: The control component comprises: A sensor, used for sensing that the needle of the external sewing machine body moves to the highest position; The controller is electrically connected to the sensor and the double-head two-position five-way solenoid valve respectively, and is used to receive the signal of the sensor and control the start and stop of the double-head two-position five-way solenoid valve to control the forward and reverse rotation angles of the rotary cylinder.

6. The multifunctional pneumatic folding mechanism according to claim 5, characterized in that: The sensor comprises a magnet block arranged on a rotating wheel of an external sewing machine body, and a Hall element arranged just above the rotating wheel. When the rotating wheel drives the magnet block to rotate to the highest point, the magnet block triggers the Hall element. The controller is provided with an operation panel for setting the number of sewing needles. When the triggering times of the Hall element are the same as the set number of sewing needles, the controller receives the signal transmitted by the Hall element and controls the start and stop of the double-head two-position five-way solenoid valve.

7. A lace sewing device, comprising a sewing machine body, characterized in that: It also includes the multifunctional pneumatic folding mechanism described in any one of claims 1 to 6, wherein the pneumatic folding mechanism is arranged on the side of the sewing machine body opposite to the operator through a mounting part, and along the moving direction of the fabric, the pushing and folding component of the pneumatic folding mechanism is on the same horizontal line as the needle of the sewing machine body.

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