Flat seaming machine

Abstract

The utility model belongs to the technical field of sewing machines, and particularly relates to a flat seaming machine. Comprising a rotary driving part, a presser foot lifting driving assembly, a thread trimming driving assembly and a stitch length adjusting driving assembly, the rotary driving part comprises a rotary part, and a presser foot lifting cam, a thread trimming cam and a stitch length adjusting cam are arranged on the rotary part; the presser foot lifting cam, the thread trimming cam and the stitch length adjusting cam respectively drive the presser foot lifting driving assembly, the thread trimming driving assembly and the stitch length adjusting driving assembly to execute presser foot lifting, thread trimming and stitch length adjusting actions without mutual interference; according to the utility model, the rotary driving piece is combined with the position relation of the stitch length adjusting cam, the thread trimming cam and the presser foot lifting cam, so that the execution of stitch length adjusting, thread trimming, thread loosening and presser foot lifting actions is realized without mutual interference, the structure is compact and simplified, the number of parts is reduced, and the part cost is reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to sewing machine technical field, especially point to a kind of binding machine. BACKGROUND

[0002] Binding machine is a kind of special sewing machine, commonly used in sewing clothes roll collar, rolled edge, folded edge, binding and splicing seam etc..Currently, binding machine needs to have the function of automatically executing thread cutting, lifting presser foot and adjusting needle spacing during sewing process.Therefore, driving member needs to be set as power source to control it respectively.If three mechanisms use three driving members, it will lead to complex structure, high cost of parts and other defects. SUMMARY

[0003] The utility model aims at providing a kind of binding machine of simplifying structure, reduce the cost of parts.

[0004] The utility model is realized as follows:

[0005] A kind of binding machine, including rotary drive, lifting presser foot drive assembly, thread cutting drive assembly and needle spacing adjustment drive assembly, the rotary drive includes rotating part, lifting presser foot cam, thread cutting cam and needle spacing adjustment cam are provided on rotating part;

[0006] The thread cutting drive assembly includes thread cutting drive crank that is rotationally arranged on the shell, first branch and second branch are provided on thread cutting drive crank, first branch is abutted with the cam surface of thread cutting cam, second branch drives the thread cutting shaft of thread cutting mechanism to move along its axis by thread cutting drive block, and the thread cutting drive block is fixed on thread cutting shaft;

[0007] The needle spacing adjustment assembly includes needle spacing adjustment crank, one end of needle spacing adjustment crank is fixed on needle spacing adjustment shaft of needle spacing adjustment mechanism, other end is suspended setting, and the suspended end of needle spacing adjustment crank is abutted with the cam surface of needle spacing adjustment cam;

[0008] The lifting presser foot drive assembly includes lifting presser foot crank, one end of lifting presser foot crank is fixed on lifting presser foot lever shaft of lifting presser foot mechanism, other end is suspended setting, and the suspended end of lifting presser foot crank is abutted with the cam surface of lifting presser foot cam;

[0009] The lifting presser foot cam, thread cutting cam and needle spacing adjustment cam respectively drive lifting presser foot drive assembly, thread cutting drive assembly and needle spacing adjustment drive assembly to execute lifting presser foot, thread cutting and needle spacing adjustment action without interfering with each other.

[0010] In the above-described binding machine, the thread cutting shaft is provided with a thread loosening push plate seat, one end of the thread loosening push plate is fixed on the thread loosening push plate seat and the other end is suspended, a sliding hole is arranged on the suspended end of the thread loosening push plate, one end of the thread loosening crank is slidably connected with the thread loosening push plate by being slidably arranged in the sliding hole, and the other end is connected with the thread loosening plate of the thread loosening assembly through the thread loosening shaft.

[0011] In the above-described binding machine, the second branch arm is connected with the thread cutting driving block through a connecting rod.

[0012] In the above-described binding machine, the thread cutting cam and the stitch length adjusting cam are connected through a connecting sleeve, the thread cutting cam, the stitch length adjusting cam and the connecting sleeve are integrated, and the connecting sleeve is fixedly connected with the rotating part.

[0013] In the above-described binding machine, the thread cutting cam comprises a first base circle segment, a thread cutting lift segment and a thread cutting return segment which are distributed in an anticlockwise direction and are sequentially connected.

[0014] In the above-described binding machine, the stitch length adjusting cam comprises a maximum stitch length segment, a transition segment, a minimum stitch length segment and a stitch length adjusting segment which are distributed in an anticlockwise direction and are sequentially connected, and the maximum stitch length segment and the minimum stitch length segment are coaxially arranged with the first base circle segment.

[0015] In the above-described binding machine, the presser foot lifting cam comprises a second base circle segment and a presser foot driving segment, and the second base circle segment is coaxially arranged with the first base circle segment.

[0016] In the above-described binding machine, the rotating part extends from both ends of the driving member, the thread cutting cam and the stitch length adjusting cam are located at one end of the rotating part, and the presser foot lifting cam is located at the other end of the rotating part.

[0017] In the above-described binding machine, the thread cutting driving crank is rotatably arranged on the machine shell through a thread cutting driving crank pin, the upper end of the thread cutting driving crank pin is provided with a limiting protruding edge, the lower end is fixedly connected with the machine shell through a screw, and the thread cutting driving crank is axially limited between the machine shell and the limiting protruding edge.

[0018] In the above-described binding machine, the first branch arm of the thread cutting driving crank abuts against the cam surface of the thread cutting cam through a roller;

[0019] The suspended end of the stitch length adjusting crank abuts against the cam surface of the stitch length adjusting cam through a stitch length adjusting steel ball;

[0020] The suspended end of the presser foot lifting crank abuts against the cam surface of the presser foot lifting cam through a presser foot lifting adjusting steel ball.

[0021] Compared with the prior art, the utility model has the advantages of:

[0022] The utility model discloses a rotating drive piece is combined with the position relation of needle pitch adjusting cam, thread trimming cam and presser foot lifting cam, respectively realizes the execution of needle pitch adjusting, thread trimming, thread loosening and presser foot lifting action and does not interfere with each other, compact structure, simplify structure, reduce the number of parts, reduce the cost of parts. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is the three -dimensional schematic diagram of the utility model, and the three -dimensional schematic diagram of the utility model is shown in the figure.

[0024] Figure 2 It is one of the schematic diagram that the presser foot lifting cam of the utility model is connected with the presser foot mechanism through the presser foot driving assembly.

[0025] Figure 3 It is two of the schematic diagram that the presser foot lifting cam of the utility model is connected with the presser foot mechanism through the presser foot driving assembly.

[0026] Figure 4 It is one of the schematic diagram that the thread trimming cam of the utility model is connected with the thread trimming mechanism and thread loosening component through the thread trimming driving assembly.

[0027] Figure 5 It is the partial enlarged schematic diagram of Figure 4

[0028] Figure 6 It is two of the schematic diagram that the thread trimming cam of the utility model is connected with the thread trimming mechanism and thread loosening component through the thread trimming driving assembly.

[0029] Figure 7 It is one of the schematic diagram that the needle pitch adjusting cam of the utility model is connected with the needle pitch adjusting mechanism through the needle pitch adjusting driving assembly.

[0030] Figure 8 It is two of the schematic diagram that the needle pitch adjusting cam of the utility model is connected with the needle pitch adjusting mechanism through the needle pitch adjusting driving assembly.

[0031] Figure 9 It is three of the schematic diagram that the needle pitch adjusting cam of the utility model is connected with the needle pitch adjusting mechanism through the needle pitch adjusting driving assembly.

[0032] Figure 10 It is the position relation diagram between the presser foot lifting cam and the presser foot adjusting steel ball, the thread trimming cam and the roller and the needle pitch adjusting cam and the needle pitch adjusting steel ball of the utility model under the thread trimming state.

[0033] Figure 11 It is one of the schematic diagram that the needle pitch adjusting cam and thread trimming cam of the utility model are integral structure.

[0034] Figure 12 ​is a schematic view of the needle spacing adjusting cam and the thread cutting cam of the utility model in an integrated structure;

[0035] Figure 13 is a schematic view of the presser foot lifting cam of the utility model;

[0036] Figure 14 is a position relation view of the three cams of the utility model;

[0037] Figure 15 is a position relation view of the three cams of the utility model;

[0038] Figure 16 is a position relation view of the three cams of the utility model.

[0039] In the figure: 1, rotating driving part; 2, rotating part; 3, presser foot lifting cam; 4, thread cutting cam; 5, needle spacing adjusting cam; 6, machine shell; 7, thread cutting driving crank; 8, first branch arm; 9, second branch arm; 10, thread cutting driving block; 11, thread cutting shaft; 12, connecting rod; 13, thread cutting shaft crank; 14, thread cutting shaft transmission block; 15, stud; 16, cutter disc front and back position adjusting seat; 17, lower cutting knife driving connecting rod; 18, cutter disc flat plate; 19, lower cutting knife bracket; 20, notch; 21, upper fixed cutter bracket; 22, lower cutting knife bracket sliding block; 23, guide column; 24, guide groove; 25, lower movable cutter; 26, main pressure spring sheet; 27, upper fixed cutter frame guide frame; 28, upper fixed cutter; 29, base; 30, first installation boss; 31, second installation boss; 32, first reset spring; 33, thread loosening push plate seat; 34, thread loosening push plate; 35, sliding hole; 36, thread loosening crank; 37, thread loosening shaft; 38, thread loosening plate; 39, roller; 40, thread cutting driving crank pin; 41, limiting convex edge; 42, needle spacing adjusting crank; 43, needle spacing adjusting shaft; 44, feeding control crank; 45, needle spacing adjusting connecting rod; 46, cloth feeding control frame; 47, second reset spring; 48, pin shaft; 49, short connecting rod; 50, feeding connecting rod; 51, cloth feeding crank; 52, main cloth feeding shaft; 53, cloth feeding connecting rod; 54, lower shaft main shaft; 55, tooth frame sliding block; 56, differential tooth frame; 57, cloth feeding tooth frame; 58, main feeding connecting rod; 59, rocker; 60, sliding groove; 61, differential connecting rod; 62, guide sliding frame; 63, difference adjusting crank; 64, differential wrench shaft; 65, needle spacing adjusting steel ball; 66, presser foot lifting crank; 67, presser foot lifting lever shaft; 68, reset torsional spring; 69, crank section; 70, pressure rod guide frame connecting plate; 71, pressure rod guide frame; 72, presser foot shaft; 73, presser foot; 74, presser foot lifting adjusting steel ball; 75, connecting sleeve; 76, first base circle section; 77, thread cutting lift section; 78, thread cutting return section; 79, maximum needle spacing section; 80, transition section; 81, minimum needle spacing section; 82, needle spacing adjusting section; 83, second base circle section; 84, presser foot lifting driving section. DETAILED DESCRIPTION

[0040] The utility model is further described below with specific examples, referring to Figure 1 -16:

[0041] The utility model provides a binding machine, this binding machine includes rotary drive 1, lifts the pressure foot drive subassembly, shears the line drive subassembly and needle distance adjustment drive subassembly, rotary drive 1 includes rotary part 2, is provided with lift the pressure foot cam 3, shears the line cam 4 and needle distance adjustment cam 5 on rotary part 2, need to explain, the rotary drive 1 of this binding machine is set up as motor, and rotary part 2 is motor shaft.

[0042] As Figure 1 , Figure 3 , Figure 4 And Figure 5 Indicated, the shears the line drive subassembly including shears the line drive crank 7 that rotates and sets up on the casing 6, is provided with first branch 8 and second branch 9 on shears the line drive crank 7, and first branch 8 and the cam face of shears the line cam 4 are in abutment, and second branch 9 drives the shearing shaft 11 of shears the line mechanism along its axis and moves through the shears the line drive block 10, and the shears the line drive block 10 is fixed and set up on the shearing shaft 11;

[0043] Further, the second branch 9 is connected with the shears the line drive block 10 through connecting rod 12.Both ends of connecting rod 12 are hinged with second branch 9 and the shears the line drive block 10 through screw.

[0044] Specifically, the shears the line mechanism includes shearing shaft 11, shearing shaft crank 13, shearing shaft crank 13 is connected with one end of stud 15 through shearing shaft drive block 14, the other end of stud 15 is hinged with one end of lower cutter driving link 17 through cutter head front and rear position adjusting seat 16, the both ends of lower cutter driving link 17 are rotatably installed on cutter head flat plate 18, the other end of lower cutter driving link 17 is inserted in the slot 20 of lower cutter bracket 19, lower cutter bracket 19 is arranged on cutter head flat plate 18, and is limited up and down by upper fixed cutter bracket 21, lower cutter bracket sliding block 22, guide column 23 is arranged on upper fixed cutter bracket 21, guide groove 24 is arranged on lower cutter bracket 19, guide column 23 is arranged in guide groove 24, one end of lower cutter bracket 19 is provided with lower movable cutter 25, main pressure spring piece 26, upper fixed cutter frame guide 27 and upper fixed cutter 28 are sequentially arranged from lower to upper on one end of upper fixed cutter bracket 21, and lower movable cutter 25 is arranged between upper fixed cutter frame guide 27 and upper fixed cutter 28.

[0045] The shearing shaft 11 is slid on the first mounting boss 30 and the second mounting boss 31 which are arranged at intervals on one side of the base 29, the shearing driving block 10 is located on the shearing shaft 11 between the two mounting bosses, and the first reset spring 32 is sleeved on the shearing shaft 11 between the first mounting boss 30 and the shearing driving block 10. The shearing shaft 11 and the stud 15 are coaxially arranged.

[0046] It should be noted that the shearing driving crank 13 is arranged on the casing 6 through the shearing driving crank pin 40, the upper end of the shearing driving crank pin 40 is provided with the limiting protruding edge 41, and the lower end is fixedly connected with the casing 6 through a screw, and the shearing driving crank 13 is axially limited between the casing 6 and the limiting protruding edge 41.

[0047] When the motor shaft rotates, the shearing driving section of the shearing cam abuts against the first supporting arm 8, the shearing driving crank 7 swings around its axis, the shearing driving block 10 is pulled by the second supporting arm 9 and the connecting rod 12 to compress the reset spring, at this time, the shearing shaft 11 slides towards the position of the electric control box of the sewing machine, and one end of the lower cutter driving connecting rod 17 and the cutter disc front and rear position adjusting seat 16 also move towards the position of the electric control box of the sewing machine, the other end of the lower cutter driving connecting rod 17 moves towards the position of the needle, pushes the lower cutter bracket 19 and the lower movable cutter 25 to move towards the position of the needle, and cooperates with the upper fixed cutter 28 to perform the shearing action.

[0048] When reversely rotating, the reset of the lower movable cutter 25 is realized.

[0049] It should be noted that the thread loosening action is needed at the same time of shearing the thread. Therefore, the binding sewing machine can also drive the thread loosening assembly to perform the thread loosening action at the same time of loosening the thread.

[0050] Specifically, one end of the shearing shaft 11 protrudes from the first mounting boss 30, the thread loosening push plate seat 33 is fixedly arranged at the end, one end of the thread loosening push plate 34 is fixedly arranged on the thread loosening push plate seat 33 and the other end is suspended, the slide hole 35 is arranged on the suspended end of the thread loosening push plate 34, one end of the thread loosening crank 36 is slidably arranged in the slide hole 35 and slidably connected with the thread loosening push plate 34, and the other end is connected with the thread loosening plate 38 of the thread loosening assembly through the thread loosening shaft 37.

[0051] In order to reduce the friction force between the shearing cam 4 and the first supporting arm 8 when the shearing cam 4 rotates, the first supporting arm 8 of the utility model abuts against the cam surface of the shearing cam 4 through the roller 39.

[0052] As Figure 1 , Figure 7 and Figure 8As shown, the needle spacing adjustment assembly comprises a needle spacing adjustment crank 42, one end of which is fixed on a needle spacing adjustment shaft 43 of the needle spacing adjustment mechanism, and the other end is suspended, and the suspended end of the needle spacing adjustment crank 42 abuts against a cam surface of the needle spacing adjustment cam 5.

[0053] Specifically, the needle spacing adjustment shaft 43 is connected with one end of a feeding control crank 44 and a needle spacing adjustment connecting rod 45, the other end of the needle spacing adjustment connecting rod 45 is connected with a fabric feeding control frame 46, and the needle spacing adjustment connecting rod 45 is further connected with the base 29 through a second reset spring 47. The two ends of the fabric feeding control frame 46 are connected with the base 29 through a pin shaft 48, the fabric feeding control frame 46 is further connected with one end of a short connecting rod 49 through a first connecting rod pin, the other end of the short connecting rod 49 is connected with a second connecting rod pin, the second connecting rod pin is further connected with a main fabric feeding shaft 52 through a feeding connecting rod 50, a fabric feeding crank 51, and the second connecting rod pin is connected with a lower shaft main shaft 54 through a fabric feeding connecting rod 53 and a fabric feeding eccentric wheel, a tooth rack sliding block 55 is arranged at the front end of the lower shaft main shaft 54, the tooth rack sliding block 55 is arranged in a slot of a differential tooth rack 56 and a fabric feeding tooth rack 57, the front end of the main fabric feeding shaft 52 is connected with the fabric feeding tooth rack 57 through a main feeding connecting rod 58, and a rocker 59 is arranged on the main fabric feeding shaft 52, a sliding groove 60 is arranged on the rocker 59, one end of a rocker sliding block is arranged on the sliding groove 60 and connected with a differential connecting rod 61, and the other end of the rocker sliding block is slidably connected with a guide sliding frame 62, the guide sliding frame 62 is fixedly connected with the differential tooth rack 56, the differential connecting rod 61 is connected with a differential wrench shaft 64 through a differential adjustment crank 63, and the differential wrench shaft 64 is arranged on the base 29.

[0054] When the motor shaft drives the needle spacing adjustment driving section of the needle spacing adjustment cam 5 to abut against the suspended end of the needle spacing adjustment crank 42, the needle spacing adjustment shaft 43, the feeding control crank 44, the needle spacing adjustment connecting rod 45, and the fabric feeding control frame 46 are sequentially driven to move, the fabric feeding control frame 46 drives the fabric feeding connecting rod 53, the lower shaft main shaft 54, and the tooth rack sliding block 55 to move, the fabric feeding control frame 46 also drives the fabric feeding crank 51, the main fabric feeding shaft 52, the main feeding connecting rod 58, and the fabric feeding tooth rack 57 to move, the main fabric feeding shaft 52 drives the rocker 59 to move, the rocker sliding block connected with the rocker 59 and the guide sliding frame 62 move, and the differential tooth rack 56 is driven to move, thereby realizing the needle spacing adjustment action.

[0055] Similarly, in order to reduce the friction between the needle spacing adjustment cam 5 and the suspended end of the needle spacing adjustment crank 42 when the needle spacing adjustment cam 5 rotates, a needle spacing adjustment steel ball 65 is arranged to abut against the cam surface of the needle spacing adjustment cam 5. The needle spacing adjustment steel ball 65 is rotatably arranged on the suspended end of the needle spacing adjustment crank 42 through a first steel ball supporting pin, and the first steel ball supporting pin is fixed on the suspended end of the needle spacing adjustment crank 42 through a screw.

[0056] As shown in FIG. 1, Figure 1 , Figure 2 and Figure 3As shown, the presser foot lifting driving assembly comprises a presser foot lifting crank 66, one end of which is fixed on a presser foot lever shaft 67 of the presser foot lifting mechanism, and the other end is suspended, and the suspended end of the presser foot lifting crank 66 abuts against a cam surface of the presser foot lifting cam 3. A spacer is arranged on the presser foot lever shaft 67 at one side of the presser foot lifting crank 66, and a return torsion spring 68 is sleeved on the spacer, one end of the return torsion spring 68 is connected to the machine shell 6, and the other end abuts against the presser foot lifting crank 66.

[0057] Specifically, the presser foot lever shaft 67 comprises a crank section 69, the outer end of the crank section 69 is connected with a presser bar guide frame 71 through a presser bar guide frame connecting plate 70, the presser bar guide frame 71 is fixedly connected with a presser shaft 72, and a presser foot is arranged at the lower end of the presser shaft 72.

[0058] When the motor shaft drives the presser foot lifting driving section of the presser foot lifting cam, the presser foot lifting crank 66 is swung to drive the presser foot lever shaft 67 to rotate, the presser bar guide frame 71, the presser shaft 72 and the presser foot 73 are lifted through the presser bar guide frame connecting plate 70, and the purpose of lifting the presser foot is achieved.

[0059] When the motor shaft is reversed or continues to rotate, the presser foot 73 can be reset.

[0060] Similarly, in order to reduce the friction between the presser foot lifting cam 3 and the suspended end of the presser foot lifting crank 66, the suspended end of the presser foot lifting crank 66 abuts against the cam surface of the presser foot lifting cam 3 through a presser foot adjusting steel ball 74. The presser foot adjusting steel ball 74 is rotatably arranged at the suspended end of the presser foot lifting crank 66 through a second steel ball supporting pin, and the second steel ball supporting pin is fixed at the suspended end of the presser foot lifting crank 66 through a screw.

[0061] As can be seen from the above, the rotary driving part 1 is provided with one, and the actions of lifting the presser foot, adjusting the needle distance and cutting the thread are realized. The presser foot lifting cam 3, the thread cutting cam 4 and the needle distance adjusting cam 5 respectively drive the presser foot lifting driving assembly, the thread cutting driving assembly and the needle distance adjusting driving assembly to execute the actions of lifting the presser foot, cutting the thread and adjusting the needle distance, and they do not interfere with each other.

[0062] In order to make the structure compact, and cooperate with the structure of the flat seaming machine, the rotary part 2 of the rotary driving part 1 of the utility model extends out of both ends of the rotary driving part 1, and is specifically provided with a double-head motor, the motor shaft is arranged in the vertical direction, and the motor shaft extends out of the upper and lower ends of the motor. The thread cutting cam 4 and the needle distance adjusting cam 5 are located at one end of the rotary part 2, and the presser foot lifting cam 3 is located at the other end of the rotary part 2.

[0063] In order to improve the assembly efficiency and reduce the assembly difficulty, the presser foot lifting cam 3, the thread cutting cam 4 and the needle distance adjusting cam 5 are arranged in the rotary part 2 of the rotary driving part 1. Figure 11 and Figure 12The thread trimming cam 4 and the needle spacing adjusting cam 5 are connected through the connecting sleeve 75, and the thread trimming cam 4, the needle spacing adjusting cam 5 and the connecting sleeve 75 are integrated, and the connecting sleeve 75 is fixedly connected with the rotating part 2.

[0064] The position relationship between the cams is shown as follows:

[0065] As shown in Figure 9 , Figure 14 , the thread trimming cam 4 comprises a first base circle segment 76, a thread trimming lift segment 77 and a thread trimming return segment 78 which are distributed along the anticlockwise direction and are sequentially connected. The thread trimming lift segment 77 and the thread trimming return segment 78 are thread trimming driving segments.

[0066] As shown in Figure 9 , Figure 15 , the needle spacing adjusting cam 5 comprises a maximum needle spacing segment 79, a transition segment 80, a minimum needle spacing segment 81 and a needle spacing adjusting segment 82 which are distributed along the anticlockwise direction and are sequentially connected. The maximum needle spacing segment 79 and the minimum needle spacing segment 81 are coaxially arranged with the first base circle segment 76. The maximum needle spacing segment 79, the needle spacing adjusting segment 82 and the minimum needle spacing segment 81 are needle spacing adjusting driving segments.

[0067] As shown in Figure 9 , Figure 13 , the presser foot lifting cam 3 comprises a second base circle segment 83 and a presser foot lifting driving segment 84, and the second base circle segment 83 is coaxially arranged with the first base circle segment 76.

[0068] As shown in Figure 9 , the roller 39 abuts against the high point position of the thread trimming lift segment 77, the needle spacing adjusting ball 65 abuts against the maximum needle spacing segment 79 of the needle spacing adjusting cam 5, and the presser foot adjusting ball 74 abuts against the second base circle segment 83 of the presser foot lifting cam 3. At this time, the thread trimming action is performed by the thread trimming machine, the needle spacing is maximum, and the presser foot 73 does not act.

[0069] The cams continue to rotate clockwise, the thread trimming cam 4 rotates to the position that the roller 39 abuts against the thread trimming return segment 78 until abutting against the adjacent end of the first base circle segment 76 and the thread trimming return segment 78 to drive the thread trimming driving assembly and the thread trimming mechanism to gradually reset, the needle spacing adjusting cam 5 rotates to the position that the needle spacing adjusting ball 65 abuts against the adjacent end of the maximum needle spacing segment 79 and the transition segment 80, and the presser foot adjusting ball 74 continues to abut against the second base circle segment 83 of the presser foot lifting cam 3. The above process is the thread trimming reset stage.

[0070] The cams continue to rotate clockwise, the presser foot lifting cam 3 rotates to the presser foot lifting driving section 84 abutting against the presser foot lifting adjusting ball 74, when the presser foot lifting adjusting ball 74 abuts against the highest point of the presser foot lifting driving section 84, at this time, the presser foot 73 is in the highest lifting state, the needle spacing adjusting ball 65 abuts against the minimum needle spacing section 81 of the needle spacing adjusting cam 5, the roller 39 abuts against the first base circle section 76 of the thread trimming cam. The above process is to perform the presser foot lifting action.

[0071] The cams continue to rotate clockwise, the presser foot lifting adjusting ball 74 abuts against the second base circle section 83 when the needle spacing adjusting ball 65 abuts against the needle spacing adjusting section 82, the roller 39 abuts against the first base circle section 76 of the thread trimming cam 4. The above process is to perform the needle spacing adjusting action.

[0072] In combination with the production needs, the rotation direction and rotation angle of the motor shaft are controlled by the controller, so that the execution of the actions of the mechanisms is realized.

[0073] The above embodiment is only one of the preferred embodiments of the present application, and does not limit the implementation range of the present application, so that: equivalent changes made according to the shape, structure and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A cover-up sewing machine, characterized in that: It includes a rotary drive (1), a presser foot lifting drive assembly, a thread cutting drive assembly, and a stitch length adjustment drive assembly. The rotary drive (1) includes a rotating part (2), on which a presser foot lifting cam (3), a thread cutting cam (4), and a stitch length adjustment cam (5) are provided. The wire cutting drive assembly includes a wire cutting drive crank (7) rotatably mounted on the housing (6). The wire cutting drive crank (7) is provided with a first arm (8) and a second arm (9). The first arm (8) abuts against the cam surface of the wire cutting cam (4). The second arm (9) drives the wire cutting shaft (11) of the wire cutting mechanism to move along its axis through the wire cutting drive block (10). The wire cutting drive block (10) is fixed on the wire cutting shaft (11). The stitch pitch adjustment assembly includes a stitch pitch adjustment crank (42), one end of which is fixed on the stitch pitch adjustment shaft (43) of the stitch pitch adjustment mechanism, and the other end is suspended. The suspended end of the stitch pitch adjustment crank (42) abuts against the cam surface of the stitch pitch adjustment cam (5). The lifting foot drive assembly includes a lifting foot crank (66), one end of which is fixed on the lifting foot lever shaft (67) of the lifting foot mechanism, and the other end is suspended. The suspended end of the lifting foot crank (66) abuts against the cam surface of the lifting foot cam (3). The presser foot lifting cam (3), the thread cutting cam (4), and the stitch length adjustment cam (5) drive the presser foot lifting drive assembly, the thread cutting drive assembly, and the stitch length adjustment drive assembly to perform presser foot lifting, thread cutting, and stitch length adjustment actions respectively without interfering with each other.

2. A cover-up sewing machine according to claim 1, characterized in that: The wire-cutting shaft (11) is provided with a wire-releasing push plate seat (33). One end of the wire-releasing push plate (34) is fixed on the wire-releasing push plate seat (33), and the other end is suspended. A sliding hole (35) is provided at the suspended end of the wire-releasing push plate (34). One end of the wire-releasing crank (36) is slidably connected to the wire-releasing push plate (34) in the sliding hole (35) through a pin, and the other end is connected to the wire-releasing plate (38) of the wire-releasing assembly through the wire-releasing shaft (37).

3. A cover-up sewing machine according to claim 1 or 2, characterized in that: The second arm (9) is connected to the wire-cutting drive block (10) via a connecting rod (12).

4. A cover-up sewing machine according to claim 1 or 2, characterized in that: The thread-cutting cam (4) and the stitch-pitch adjustment cam (5) are connected by a connecting sleeve (75). The thread-cutting cam (4), the stitch-pitch adjustment cam (5) and the connecting sleeve (75) are an integral structure. The connecting sleeve (75) is fixedly connected to the rotating part (2).

5. A cover-up sewing machine according to claim 4, characterized in that: The wire-cutting cam (4) includes a first base circle segment (76), a wire-cutting lift segment (77), and a wire-cutting return segment (78), which are distributed counterclockwise and connected in sequence.

6. A cover-up sewing machine according to claim 5, characterized in that: The stitch length adjustment cam (5) includes a maximum stitch length section (79), a transition section (80), a minimum stitch length section (81), and a stitch length adjustment section (82) that are distributed counterclockwise and connected in sequence. The maximum stitch length section (79) and the minimum stitch length section (81) are both coaxially arranged with the first base circle section (76).

7. A cover-up sewing machine according to claim 4, characterized in that: The lifting foot cam (3) includes a second base circle segment (83) and a lifting foot drive segment (84), wherein the second base circle segment (83) is coaxially arranged with the first base circle segment (76).

8. A cover-up sewing machine according to claim 1, 2, 5, 6, or 7, characterized in that: The rotating part (2) extends out of both ends of the driving member. The wire cutting cam (4) and the needle pitch adjustment cam (5) are located at one end of the rotating part (2), and the pressure foot lifting cam (3) is located at the other end of the rotating part (2).

9. A cover-up sewing machine according to claim 1 or 2, characterized in that: The wire-cutting drive crank (7) is rotatably mounted on the housing (6) via the wire-cutting drive crank pin (40). The upper end of the wire-cutting drive crank pin (40) is provided with a limiting flange (41), and the lower end is fixedly connected to the housing (6) by screws. The wire-cutting drive crank (7) is axially limited between the housing (6) and the limiting flange.

10. A cover-up sewing machine according to claim 1 or 2, characterized in that: The first arm (8) of the wire-cutting drive crank (7) abuts against the cam surface of the wire-cutting cam (4) via a roller (39); The suspended end of the needle pitch adjusting crank (42) abuts against the cam surface of the needle pitch adjusting cam (5) through the needle pitch adjusting steel ball (65); The suspended end of the lifting foot crank (66) abuts against the cam surface of the lifting foot cam (3) via the lifting foot adjusting steel ball (74).

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