Chain stitch sewing machine

Abstract

The application belongs to the technical field of sewing equipment, and particularly relates to a chain sewing machine, which comprises a machine shell, an integrated module and a presser foot lifting mechanism. The integrated module comprises a driving element mounting bracket and a first rotary driving element. A thread cutting cam and a presser foot lifting cam are arranged on a first rotary output end of the first rotary driving element. The thread cutting cam has a thread cutting base circular segment and a thread cutting driving segment. The presser foot lifting cam has a presser foot lifting base circular segment and a presser foot lifting driving segment. A thread cutting mechanism is further arranged on the driving element mounting bracket. An upper end of a thread cutting shaft of the thread cutting mechanism extends into a cavity. The thread cutting shaft and the thread cutting cam are transmissionally connected through a thread cutting driving mechanism. The first rotary output end drives the presser foot lifting cam and the thread cutting cam to rotate, respectively drives the presser foot lifting driving mechanism and the thread cutting driving mechanism to act, and performs presser foot lifting and thread cutting actions without interference. The application controls the actions of thread cutting and presser foot lifting through a single rotary driving element, reduces the number of driving elements, and reduces hardware cost and assembly complexity.

Description

Technical Field

[0001] This invention belongs to the field of sewing equipment technology, specifically referring to a chain sewing machine. Background Technology

[0002] A chain stitch sewing machine is a specialized device that uses chain stitches for sewing. Unlike the common lockstitch (formed by interlacing top and bottom threads), the chain stitch uses only one or a single thread to form a continuous chain-like stitch through self-linking loops, giving it unique characteristics and applications.

[0003] The existing chain sewing machine uses different drive components to drive the thread cutting mechanism and the presser foot lifting mechanism, which undoubtedly leads to defects such as bulky machine structure and high cost. Summary of the Invention

[0004] The purpose of this invention is to provide a chain sewing machine in which a single drive unit drives the thread cutting and presser foot lifting actions respectively.

[0005] This invention is implemented as follows:

[0006] A chain sewing machine, comprising: a machine housing;

[0007] The integrated module includes a drive component mounting bracket with an open cavity, and a first rotary drive component disposed on the left side of the drive component mounting bracket. The first rotary drive component has a first rotary output end, which extends into the cavity and is provided with a wire-cutting cam and a pressure foot lifting cam. The wire-cutting cam has a wire-cutting base circular segment and a wire-cutting drive segment. The pressure foot lifting cam has a pressure foot base circular segment and a pressure foot lifting drive segment. A wire-cutting mechanism is also provided on the drive component mounting bracket. The upper end of the wire-cutting shaft of the wire-cutting mechanism extends into the cavity. The wire-cutting shaft and the wire-cutting cam are connected by a wire-cutting drive mechanism.

[0008] The presser foot lifting mechanism includes a presser rod assembly, which is movably mounted on the housing. The presser rod assembly and the presser foot lifting cam are connected by a presser foot lifting drive mechanism.

[0009] The integrated module is mounted to the left end face of the housing via a drive component mounting bracket;

[0010] The first rotary output end drives the lifting foot cam and the wire cutting cam to rotate, respectively driving the lifting foot drive mechanism and the wire cutting drive mechanism to perform the lifting foot and wire cutting actions without interfering with each other.

[0011] In the aforementioned chain sewing machine, the thread-cutting drive mechanism includes a thread-cutting drive push block, one end of which is disposed on the thread-cutting shaft and the other end of which is disposed on a first rolling element that abuts against the outer cam surface of the thread-cutting cam.

[0012] In the chain stitch sewing machine, upper and lower mounting seats are arranged on the upper and lower sides of the driving member mounting bracket, and the thread trimming shaft is slidably arranged on the upper and lower mounting seats.

[0013] In the chain stitch sewing machine, a thread trimming shaft guide seat is arranged on the inner wall of the driving member mounting bracket, the thread trimming shaft guide seat has a guide groove arranged in the up-down direction, and a guide block is arranged on the thread trimming drive push block and moves in the guide groove.

[0014] In the chain stitch sewing machine, the presser foot lifting drive mechanism includes a presser bar guide frame, one end of the presser bar guide frame is connected to the presser bar assembly, and the other end is provided with a second rolling member abutting against the outer cam surface of the presser foot lifting cam.

[0015] In the chain stitch sewing machine, a presser foot lifting plate is arranged on the inner wall of the machine shell on one side of the presser bar assembly, one end of the presser foot lifting plate is connected to the presser foot lifting mechanism, and the other end is connected to the presser bar guide frame.

[0016] In the chain stitch sewing machine, the second rotary drive member is mounted on the right end surface of the machine shell.

[0017] In the chain stitch sewing machine, further comprising:

[0018] The second rotary drive member has a second rotary output end;

[0019] The stitch length adjustment drive mechanism includes a backstitch crank arranged on the second rotary output end, one end of the backstitch connecting rod is connected to the backstitch crank, and the other end is connected to the swing seat of the stitch length adjustment mechanism.

[0020] In the chain stitch sewing machine, the outer cover of the first rotary drive member is provided with an outer cover, and the outer cover is fixedly arranged on the driving member mounting bracket.

[0021] In the chain stitch sewing machine, further comprising a bottom plate, a needle plate is arranged on the bottom plate, a push plate is arranged on one side of the needle plate, first and second light eyes are arranged on the push plate in front and back, and an upper light eye assembly is arranged on the driving member mounting bracket and is opposite to the first and second light eyes;

[0022] When the first light eye is blocked by the sewing material, the controller controls the first rotary output end to rotate, drives the presser foot lifting mechanism to act and lift the presser foot, at this time, the thread trimming mechanism does not act;

[0023] After the presser foot is lifted, the controller drives the first rotary output end to rotate reversely after waiting for a preset time, and lowers the presser foot;

[0024] When the sewing material covers the first light hole and the second light hole at the same time, the controller calculates the number of stitches, drives the first rotary output end to rotate, drives the thread cutting mechanism to act, cuts the thread before sewing and resets, and then, in the case of covering the first light hole and the second light hole at the same time, the thread cutting mechanism does not act.

[0025] When the sewing material moves to expose the first light hole and the second light hole in turn, the controller controls the thread cutting mechanism to act to cut the thread after sewing.

[0026] The present application has the following outstanding advantages compared with the prior art:

[0027] 1. The present application controls the actions of thread cutting and presser foot lifting by a single rotary drive (i.e. the first rotary drive), uses the segmented design (base circle segment + drive segment) of the coaxially installed thread cutting cam and presser foot lifting cam, reduces the number of drive components, has a compact structure, and reduces hardware cost and assembly complexity.

[0028] 2. The integrated module of the present application can be disassembled and assembled as a whole, and users can upgrade a basic chain sewing machine to an automatic thread cutting + presser foot lifting model by adding the integrated module, which only needs to replace a few corresponding accessories, is quick and convenient to upgrade and modify, does not need to replace the whole machine or main mechanical structure, is convenient to maintain, has strong compatibility, and the same integrated module can be adapted to multiple models of basic chain sewing machines. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 is a perspective view of the present application;

[0030] Figure 2 is a schematic view of the integrated module of the present application;

[0031] Figure 3 is a partial view of the present application after the drive component mounting bracket and the outer cover are disassembled;

[0032] Figure 4 is a schematic view of the present application after the integrated module is disassembled;

[0033] Figure 5 is a schematic view of the second rotary drive component of the present application mounted on the machine shell;

[0034] Figure 6 is a schematic view of the automatic presser foot lifting structure of the present application;

[0035] Figure 7 is a schematic view of the automatic thread cutting structure of the present application;

[0036] Figure 8 is a schematic view of the automatic stitch length adjustment structure of the present application.

[0037] In the figure: 1, the casing; 2, the chamber; 3, the driving element mounting support; 4, the first rotary driving element; 5, the first rotary output end; 6, the thread trimming cam; 7, the presser foot lifting cam; 8, the thread trimming mechanism; 9, the thread trimming shaft; 10, the pressure rod assembly; 11, the thread trimming driving push block; 12, the first rolling element; 13, the upper mounting seat; 14, the lower mounting seat; 15, the reset spring; 16, the thread trimming shaft guide seat; 17, the guide block; 18, the pressure rod guide frame; 19, the second rolling element; 20, the presser foot lifting plate; 21, the presser foot lifting front lever; 22, the outer cover; 23, the second rotary driving element; 24, the second rotary output end; 25, the backstitching crank; 26, the backstitching connecting rod; 27, the swing seat; 28, the bottom plate; 29, the needle plate; 30, the push plate; 31, the first light eye; 32, the second light eye; 33, the light eye assembly. DETAILED DESCRIPTION

[0038] The application will be further described in the following specific embodiments, referring to the accompanying drawings. Figure 1 -8:

[0039] The application provides a chain sewing machine, which comprises a casing 1, an integrated module and a presser foot lifting mechanism; wherein the integrated module comprises a driving element mounting support 3 with an open chamber 2, a first rotary driving element 4 arranged on the left side surface of the driving element mounting support 3, the first rotary driving element 4 having a first rotary output end 5, the first rotary output end 5 extending into the chamber 2 and being provided with a thread trimming cam 6 and a presser foot lifting cam 7, the thread trimming cam 6 having a thread trimming base circle segment and a thread trimming driving segment, the presser foot lifting cam 7 having a presser foot lifting base circle segment and a presser foot lifting driving segment, and a thread trimming mechanism 8 further arranged on the driving element mounting support 3, the upper end of a thread trimming shaft 9 of the thread trimming mechanism 8 extending into the chamber 2, and the thread trimming mechanism 8 being fixedly arranged on the casing 1 through a mounting support. The thread trimming shaft 9 and the thread trimming cam 6 are drivingly connected through a thread trimming driving mechanism. The integrated module is mounted on the left end surface of the casing 1 through the driving element mounting support 3. The presser foot lifting mechanism comprises a pressure rod assembly 10, the pressure rod assembly 10 being movably arranged on the casing 1, and the pressure rod assembly 10 and the presser foot lifting cam 7 being drivingly connected through a presser foot lifting driving mechanism. The first rotary output end 5 of the application drives the presser foot lifting cam 7 and the thread trimming cam 6 to rotate to respectively drive the presser foot lifting driving mechanism and the thread trimming driving mechanism to perform the presser foot lifting and thread trimming actions without interfering with each other.

[0040] As known from the above, the application controls the actions of thread trimming and presser foot lifting through a single rotary driving element (i.e. the first rotary driving element 4), utilizes the segmented design (base circle segment + driving segment) of the coaxially arranged thread trimming cam 6 and presser foot lifting cam 7, reduces the number of driving elements, and lowers the hardware cost and assembly complexity.

[0041] In addition, the integrated module of the present application can be disassembled as a whole, and a user can upgrade a basic chain sewing machine to an automatic thread trimming + presser foot lifting machine type by adding the integrated module, and only a few corresponding accessories need to be replaced, without replacing the whole machine, and the maintenance of the machine is facilitated.

[0042] Further, the thread trimming driving mechanism comprises a thread trimming driving push block 11, one end of the thread trimming driving push block 11 is arranged on the thread trimming shaft 9, and the other end is provided with a first rolling element 12 abutting against the outer cam surface of the thread trimming cam 6.

[0043] In order to make the lifting stable, upper and lower installation seats 13 and 14 are arranged on the driving element installation support 3 in an up-down direction, the lower installation seat 14 can be the bottom plate of the driving element installation support 3, the thread trimming shaft 9 is slidably arranged on the upper and lower installation seats 13 and 14, and a return spring 15 is sleeved on the thread trimming shaft 9 between the thread trimming driving push block 11 and the lower installation seat 14, so as to realize the automatic return of the thread trimming mechanism 8.

[0044] In addition, a thread trimming shaft guide seat 16 is arranged on the inner wall of the driving element installation support 3, the thread trimming shaft guide seat 16 has a guide groove arranged in the up-down direction, a guide block 17 is arranged on the thread trimming driving push block 11, and the guide block 17 moves in the guide groove, so as to prevent the thread trimming shaft 9 from rotating.

[0045] The presser foot lifting driving mechanism comprises a presser rod guide frame 18, one end of the presser rod guide frame 18 is connected to the presser rod assembly 10, and the other end is provided with a second rolling element 19 abutting against the outer cam surface of the presser foot lifting cam 7. It should be noted that the first rolling element 12 and the second rolling element 19 can both be bearings or rollers.

[0046] A presser foot lifting plate 20 is arranged on the inner wall of the cabinet 1 on one side of the presser rod assembly 10, one end of the presser foot lifting plate 20 is connected to a presser foot lifting front lever 21 of the presser foot lifting mechanism, and the other end is connected to the presser rod guide frame 18. The presser foot lifting plate 20 can realize manual rotation of a presser foot lifting wrench to realize presser foot lifting, or realize presser foot lifting through knee control or electromagnetic iron driving.

[0047] For a basic chain sewing machine without automatic thread trimming and presser foot lifting functions, the original presser foot lifting mechanism is usually driven by an electromagnetic iron. When the integrated module of the present application is added, only the following steps are needed: removing the original electromagnetic iron driving assembly (including the electromagnetic iron body and the connecting wire harness); replacing the original presser rod guide frame with the presser rod guide frame 18 with the second rolling element 19; fixing the driving element installation support 3 to the left end face of the cabinet 1 through bolts (replacing the panel of the basic chain sewing machine); and connecting the power supply and control signal line of the first rotary driving element 4 to the controller.

[0048] Conversely, when the chain sewing machine with automatic thread trimming and presser foot lifting functions needs to be adjusted to a basic chain sewing machine, the integrated module of the application is disassembled, the electromagnet and the original presser bar guide are reassembled.

[0049] When the thread trimming cam 6 or the presser foot lifting cam 7 or other parts are worn, the integrated module can be disassembled, and the corresponding parts can be replaced. When the parts cannot be replaced, the integrated module can be directly replaced, which is convenient for replacement and maintenance.

[0050] The working principle of the presser foot lifting and thread trimming of the application is as follows:

[0051] The first rotating driving part 4 rotates to drive the thread trimming cam 6 and the presser foot lifting cam 7 to rotate. When the first rolling part 12 rolls to the thread trimming driving section, the thread trimming shaft 9 is driven by the thread trimming driving push block 11 to move downward, and then the thread trimming mechanism 8 is driven to move downward until the moving cutter of the thread trimming mechanism cooperates with the fixed cutter on one side of the needle plate to perform the thread trimming action. At this time, the second rolling part 19 rolls on the presser foot lifting base circle section of the presser foot lifting cam 7, and the presser foot lifting mechanism does not act.

[0052] Conversely, when the second rolling part 19 rolls to the presser foot lifting driving section of the presser foot lifting cam 7, the presser bar guide 18 drives the presser bar assembly 10 to move upward to achieve the purpose of lifting the presser foot. At this time, the first rolling part 12 rolls on the thread trimming base circle section, and the thread trimming mechanism 8 does not act.

[0053] In order to improve the protection of the first rotating driving part 4 and also to improve the appearance of the whole machine, an outer cover 22 is arranged on the outer cover of the first rotating driving part 4, and the outer cover 22 is fixedly arranged on the driving part mounting bracket 3. The outer cover 22 is also provided with air holes.

[0054] In order to further improve the automation degree of the machine, the application also comprises an automatic needle spacing adjusting structure, which comprises a second rotating driving part 23 and a needle spacing adjusting driving mechanism. The second rotating driving part 23 has a second rotating output end 24. The needle spacing adjusting driving mechanism comprises a backstitch crank 25 arranged on the second rotating output end 24, and a backstitch connecting rod 26 connected to the backstitch crank 25 at one end and connected to a swing seat 27 of the needle spacing adjusting mechanism at the other end.

[0055] The second rotating driving part 23 is arranged on the right end surface of the machine shell 1. The second rotating driving part 23 is also provided with a cover.

[0056] It should be noted that the first rotating driving part 4 and the second rotating driving part 23 of the application are preferably step motors, and can also be servo motors or the like.

[0057] The application also comprises a bottom plate 28, a needle plate 29 is arranged on the bottom plate 28, a push plate 30 is arranged on one side of the needle plate 29, the first light eye 31 and the second light eye 32 are arranged on the push plate 30 at intervals, an upper light eye assembly 33 is arranged on the driving element mounting bracket 3 and is opposite to the first light eye 31 and the second light eye 32, and the above structure can further improve the automation degree of the chain sewing machine. When the first light eye 31 is covered by the sewing material, the controller controls the first rotary output end 5 to rotate, drives the presser foot lifting mechanism to lift the presser foot, at this time, the thread cutting mechanism 8 does not act; the controller drives the first rotary output end 5 to reversely rotate after waiting for a preset time after the presser foot is lifted, and the presser foot is lowered; when the first light eye 31 and the second light eye 32 are covered by the sewing material at the same time, the controller calculates the number of stitches, drives the first rotary output end 5 to rotate, drives the thread cutting mechanism 8 to act, cuts the thread before sewing and resets, and thereafter, the thread cutting mechanism 8 does not act under the condition that the first light eye 31 and the second light eye 32 are covered at the same time. When the sewing material moves and exposes the first light eye 31 and the second light eye 32 in turn, the controller controls the thread cutting mechanism 8 to act to cut the thread after sewing.

[0058] It should be noted that the upper light eye assembly 33 of the application can have one upper light eye opposite to the first light eye 31 and the second light eye 32, or two upper light eyes opposite to the first light eye 31 and the second light eye 32, since the structure belongs to the prior art, the application will not be described in detail.

[0059] The above embodiment is only one of the preferred embodiments of the application, and does not limit the implementation range of the application, so that: equivalent changes made according to the shape, structure, principle of the application should be covered in the protection scope of the application.

Claims

1. A chain stitch sewing machine characterized by: It comprises: a casing (1); an integrated module which can be assembled and disassembled as a whole, is installed on the left end face of the casing (1) through a driving member installation support (3), and is used to replace the original panel and electromagnet driving assembly on the basic machine type; the integrated module comprises the driving member installation support (3) with an open cavity (2), a first rotary driving member (4) arranged on the left side face of the driving member installation support (3), the first rotary driving member (4) has a first rotary output end (5) which extends into the cavity (2) and is provided with a thread cutting cam (6) and a presser foot lifting cam (7), the thread cutting cam (6) has a thread cutting base circular segment and a thread cutting driving segment, the presser foot lifting cam (7) has a presser foot lifting base circular segment and a presser foot lifting driving segment, and a thread cutting mechanism (8) is further arranged on the driving member installation support (3), the upper end of a thread cutting shaft (9) of the thread cutting mechanism (8) extends into the cavity (2), and the thread cutting shaft (9) and the thread cutting cam (6) are transmissionally connected through a thread cutting driving mechanism; a presser foot lifting mechanism which comprises a presser bar assembly (10), the presser bar assembly (10) is movably arranged on the casing (1), and the presser bar assembly (10) and the presser foot lifting cam (7) are transmissionally connected through a presser foot lifting driving mechanism; the first rotary output end (5) drives the presser foot lifting cam (7) and the thread cutting cam (6) to rotate, respectively drives the presser foot lifting driving mechanism and the thread cutting driving mechanism to act, and performs presser foot lifting and thread cutting actions without interference.

2. A chain stitch sewing machine according to claim 1, characterized in that: the thread cutting driving mechanism comprises a thread cutting driving push block (11), one end of the thread cutting driving push block (11) is arranged on the thread cutting shaft (9), and the other end is provided with a first rolling member (12) which abuts against the outer cam face of the thread cutting cam (6).

3. A chain stitch sewing machine according to claim 2, characterized in that: upper and lower installation seats (13) and (14) are arranged on the inner wall of the driving member installation support (3) in an upper and lower interval, the thread cutting shaft (9) is slidably arranged on the upper and lower installation seats (13) and (14), and a return spring (15) is sleeved on the thread cutting shaft (9) between the thread cutting driving push block (11) and the lower installation seat (14).

4. A chain stitch sewing machine according to claim 2, characterized in that: a thread cutting shaft guide seat (16) is arranged on the inner wall of the driving member installation support (3), the thread cutting shaft guide seat (16) has a guide groove arranged in the upper and lower directions, a guide block (17) is arranged on the thread cutting driving push block (11), and the guide block (17) moves in the guide groove.

5. A chain stitch sewing machine according to claim 1, characterized in that: the presser foot lifting driving mechanism comprises a presser bar guide frame (18), one end of the presser bar guide frame (18) is connected to the presser bar assembly (10), and the other end is provided with a second rolling member (19) which abuts against the outer cam face of the presser foot lifting cam (7).

6. A chain stitch sewing machine according to claim 5, characterized in that: a presser foot lifting plate (20) is arranged on the inner wall of the casing (1) on one side of the presser bar assembly (10), one end of the presser foot lifting plate (20) is connected to a presser foot lifting front lever (21) of the presser foot lifting mechanism, and the other end is connected to the presser bar guide frame (18).

7. A chain stitch sewing machine according to any one of claims 1 to 6, characterized in that: an outer cover (22) is arranged on the first rotary driving member (4), and the outer cover (22) is fixedly arranged on the driving member installation support (3).

8. A chain stitch sewing machine according to any one of claims 1 to 6, characterized in that: it further comprises: a second rotary driving member (23) which has a second rotary output end (24). The stitch length adjusting driving mechanism comprises a reverse stitch crank (25) arranged on the second rotary output end (24), and a reverse stitch connecting rod (26) having one end connected to the reverse stitch crank (25) and the other end connected to a swing seat (27) of the stitch length adjusting mechanism.

9. A chain stitch sewing machine according to claim 8, characterized in that: The second rotary driving member (23) is mounted on the right end surface of the machine shell (1).

10. A chain stitch sewing machine according to any one of claims 1 to 6, characterized in that: Further comprising a bottom plate (28) having a needle plate (29) arranged thereon, a push plate (30) arranged on one side of the needle plate (29), first and second light eyes (31, 32) arranged on the push plate (30) in front and back directions, and an upper light eye assembly (33) arranged on the driving member mounting bracket (3) and arranged to be in alignment with the first and second light eyes (31, 32); When the sewing material covers the first light eye (31), the controller controls the first rotary output end (5) to rotate, thereby driving the presser foot mechanism to act and lift the presser foot, at this time, the thread cutting mechanism (8) does not act; After the presser foot is lifted, the controller waits for a preset time, and then drives the first rotary output end (5) to rotate reversely, thereby lowering the presser foot; When the sewing material covers the first light eye (31) and the second light eye (32) at the same time, the controller calculates the number of stitches, drives the first rotary output end (5) to rotate, thereby driving the thread cutting mechanism (8) to act, cutting the thread before sewing and resetting, and then, under the condition that the first light eye (31) and the second light eye (32) are covered at the same time, the thread cutting mechanism (8) does not act; When the sewing material moves to expose the first light eye (31) and the second light eye (32) in turn, the controller controls the thread cutting mechanism (8) to act to cut the thread after sewing.

Images