A control method for a serging machine

Abstract

The application relates to a control method of an overlock machine, which comprises the following steps: obtaining a current state of the overlock machine; based on a target state of the overlock machine, controlling a driving member to drive a cam member to rotate, so that a presser foot lifting contour, a thread trimming contour, a tooth underfeed contour or a stitch length adjusting contour on the cam member drives corresponding presser foot mechanism, thread trimming mechanism, tooth underfeed mechanism or stitch length adjusting mechanism to act, so that the overlock machine is switched from the current state to the target state. During work, the rotation angle of the cam member can be controlled by the driving member, the cam member can selectively act on the presser foot mechanism, the thread trimming mechanism, the tooth underfeed mechanism and the stitch length adjusting mechanism, the automatic control of the presser foot, the thread trimming, the tooth underfeed and the stitch length adjusting of the overlock machine can be realized by one driving member, and the structure is simplified and the cost is reduced.

Description

Technical Field

[0001] This invention relates to the technical field of sewing, and in particular to a control method for an overlock sewing machine. Background Technology

[0002] Existing automated overlock sewing machines have automatic presser foot lifting and thread trimming functions. Some even use a single motor (servo / stepper) to drive two machines in both forward and reverse directions, achieving this function with relatively low noise levels. However, the stitch length adjustment and feed mechanism in existing overlock sewing machines remain mechanical. Adding a motor or power source to automate these functions would significantly increase the cost of the machine's electrical control system and components, thereby reducing its market competitiveness. Summary of the Invention

[0003] In view of this, it is necessary to provide a control method for overlock sewing machines to solve the above-mentioned technical problems.

[0004] A control method for an overlock sewing machine, the overlock sewing machine comprising a drive component, a cam component, a presser foot lifting mechanism, a thread cutting mechanism, a feed tooth mechanism, and a stitch length adjustment mechanism, wherein the cam component is mounted on the drive component, and the cam component has presser foot contours, thread cutting contours, feed tooth mechanisms, and stitch length adjustment contours respectively capable of correspondingly cooperating with the presser foot lifting mechanism, the thread cutting mechanism, the feed tooth mechanism, and the stitch length adjustment mechanism; the control method for the overlock sewing machine includes:

[0005] Get the current status of the overlock sewing machine;

[0006] Based on the target state of the overlock sewing machine, the control drive unit drives the cam component to rotate, causing the presser foot lifting profile, thread cutting profile, feed profile or stitch length adjustment profile on the cam component to drive the corresponding presser foot lifting mechanism, thread cutting mechanism, feed tooth mechanism or stitch length adjustment mechanism to switch the overlock sewing machine from the current state to the target state.

[0007] In this application, through the above-mentioned reasonable structural setting, the overlock sewing machine can control the rotation angle of the cam component through the drive component during operation, so as to realize the cam component's selective action on the presser foot lifting mechanism, thread cutting mechanism, tooth feeding mechanism and stitch length adjustment mechanism. In this way, the overlock sewing machine can realize automatic control of presser foot lifting, thread cutting, tooth feeding and stitch length adjustment with one drive component, which has the effect of simplifying the structure and reducing costs.

[0008] In one embodiment, the stitch length adjustment mechanism includes a main shaft motor, a fabric feeding assembly, a first crank, a crank connecting assembly, a drive shaft, and a second crank. The fabric feeding assembly is mounted on the rotating shaft of the main shaft motor. The fabric feeding assembly is provided with a needle opening groove. One end of the first crank is provided with a stitch length adjustment component, and the first crank can drive the stitch length adjustment component to engage in the needle opening groove. The other end of the first crank is connected to the drive shaft through the crank connecting assembly. The second crank is mounted on the drive shaft, and the stitch length roller is rotatably mounted on the second crank.

[0009] It is understandable that the above-described structural design is used to specifically realize the structural configuration of the needle spacing adjustment mechanism.

[0010] In one embodiment, the cam member has a timing zero position, and when the drive member controls the cam member to be in the timing zero position, the presser foot lifting mechanism, the thread cutting mechanism, the tooth feeding mechanism, and the needle pitch adjustment mechanism are all inactive.

[0011] It is understandable that the above structural design enables the setting of the initial position of the cam component during the operation of the overlock sewing machine, which facilitates the control of the overlock sewing machine while meeting the usage requirements during normal operation.

[0012] In one embodiment, when the drive unit controls the cam to rotate counterclockwise from the timing zero position within a preset angle A, the cam acts on the presser foot lifting mechanism to put the overlock sewing machine in the presser foot lifting timing segment. During this process, the thread cutting mechanism, the tooth feeding mechanism, and the stitch length adjustment mechanism do not operate.

[0013] It is understandable that the above structural design is used to specifically control the lifting of the presser foot during the operation of the overlock sewing machine.

[0014] In one embodiment, when the drive unit controls the cam to rotate counterclockwise within a preset angle B after a preset angle A, the cam acts on the tooth feeding mechanism to put the overlock sewing machine into the tooth feeding sequence. During this process, the thread cutting mechanism and the stitch length adjustment mechanism do not operate, and the presser foot lifting mechanism is in the completed operation state.

[0015] It is understandable that the above structural design is used to specifically control the downward feed of the teeth during the operation of the overlock sewing machine.

[0016] In one embodiment, when the drive unit controls the cam to rotate counterclockwise within a preset angle C after the preset angle A plus the preset angle B, the cam acts on the stitch length adjustment mechanism to put the overlock sewing machine into the stitch length adjustment sequence. During this process, the thread cutting mechanism does not operate, and the presser foot lifting mechanism and the tooth lowering mechanism are both in the completed operation state.

[0017] It is understandable that the above structural design is used to specifically control the stitch length adjustment during the operation of the overlock sewing machine.

[0018] In one embodiment, when the drive unit controls the cam to rotate clockwise from the zero position within a preset angle D, the cam acts on the thread-cutting mechanism to put the overlock sewing machine into the thread-cutting sequence. During this process, the presser foot lifting mechanism, the tooth feeding mechanism, and the stitch length adjustment mechanism do not operate.

[0019] It is understandable that the above structural design is used to control the thread cutting during the operation of the overlock sewing machine.

[0020] In one embodiment, when the drive unit controls the cam to rotate clockwise within a preset angle E after a preset angle D, the cam acts on the stitch length adjustment mechanism to put the overlock sewing machine into the stitch length adjustment sequence. During this process, the presser foot lifting mechanism and the tooth feeding mechanism do not operate, and the thread cutting mechanism is in the thread cutting position at this time.

[0021] It is understandable that the above structural design is used to specifically control another stitch length adjustment when the overlock sewing machine is working.

[0022] In one embodiment, the timing zero position of the cam element is set to a preset range.

[0023] It is understandable that the timing zero position of the cam component is set to a preset range so that the drive component can control the cam component to be at the position of the timing zero position.

[0024] In one embodiment, the cam member has a presser foot profile corresponding to the presser foot lifting mechanism, a thread cutting profile corresponding to the thread cutting mechanism, a lower supply profile corresponding to the lower supply mechanism for teeth, and a stitch length adjustment profile corresponding to the stitch length adjustment mechanism. The drive member can act on the presser foot lifting mechanism, the thread cutting mechanism, the lower supply mechanism for teeth, and the stitch length adjustment mechanism respectively through the presser foot lifting profile, the thread cutting profile, the lower supply profile, and the stitch length adjustment profile on the cam member.

[0025] It is understandable that the above structural design enables the transmission and coordination between the cam component and the presser foot lifting mechanism, the wire cutting mechanism, the tooth feeding mechanism, and the needle pitch adjustment mechanism.

[0026] In one embodiment, the cam component includes a first cam portion, a second cam portion, and a third cam portion, wherein the rotation center lines of the first cam portion, the second cam portion, and the third cam portion are arranged on the same straight line; the lifting foot contour and the lower supply contour are arranged on the outer peripheral surface of the first cam portion, the stitch length adjustment contour is arranged on the outer peripheral surface of the second cam portion, and the thread cutting contour is arranged on the outer peripheral surface of the third cam portion.

[0027] It is understandable that the above structural settings specifically realize the structural settings of the lifting foot contour, the shearing contour, the lower feed contour, and the stitch pitch adjustment contour on the cam component. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structure of an overlock sewing machine provided in an embodiment of this application.

[0029] Figure 2 This is a schematic diagram of the lifting foot mechanism in this application.

[0030] Figure 3 for Figure 2 Enlarged view of part P in the image.

[0031] Figure 4 This is a schematic diagram of the wire-cutting mechanism in this application.

[0032] Figure 5 This is a schematic diagram of the drive component, cam component, and tooth lowering mechanism in this application.

[0033] Figure 6 This is a schematic diagram of the needle pitch adjustment mechanism in this application.

[0034] Figure 7 This is a partial structural diagram of the needle pitch adjustment mechanism in this application.

[0035] Figure 8 This is the front view of the cam component in this application.

[0036] Figure 9 This is a right view of the cam component in this application.

[0037] Figure 10 This is a rear view of the cam component in this application.

[0038] Figure 11 , Figure 12 This is the control logic of an embodiment of the overlock sewing machine in this application.

[0039] Figure 13 , Figure 14 This is the control logic for another embodiment of the overlock sewing machine in this application.

[0040] Among them, 10. Housing; 20. Presser foot lifting mechanism; 21. Presser foot roller; 22. Presser foot lifting crank; 23. Connecting hook; 24. Lever; 241. Pushing protrusion; 25. Return ring; 251. Stop block; 26. Presser foot shaft; 27. Presser foot arm; 28. Presser foot assembly; 30. Wire cutting mechanism; 31. Wire cutting roller; 32. Guide seat; 33. Sliding shaft; 34. Wire cutting slide fork; 35. Wire cutting connecting rod; 36. Wire cutting... 37. Thread Crank; 40. Thread Cutter Assembly; 41. Lower Feed Mechanism; 42. Lower Feed Roller; 43. Connecting Sleeve; 44. Drive Shaft; 45. Eccentric Part; 46. Lower Feed Crank; 47. Thread Holder; 48. Opening Slot; 49. Main Shaft; 50. Stitch Pitch Adjustment Mechanism; 51. Stitch Pitch Roller; 52. Main Shaft Motor; 53. Rotating Shaft Part; 54. Fabric Feed Assembly; 55. Opening Slot; 56. First Crank; 57. Stitch Pitch Adjustment Mechanism Components; 55. Crank connecting assembly; 551. Third crank; 552. Crank connecting rod; 553. Fourth crank; 554. Mounting shaft; 56. Drive shaft; 57. Second crank; 60. Drive component; 61. Rotating part; 70. Cam component; 701. First cam part; 702. Second cam part; 703. Third cam part; 71. Presser foot profile; 711. Presser foot base circle segment; 712. First presser foot involute segment 713. Second presser foot involute segment; 72. Thread trimming profile; 721. Thread trimming base circle segment; 722. First thread trimming involute segment; 723. Second thread trimming involute segment; 73. Lower feed profile; 731. First lower feed base circle segment; 732. Lower feed involute segment; 733. Second lower feed base circle segment; 74. Stitch pitch adjustment profile; 741. First stitch pitch base circle segment; 742. Stitch pitch involute segment; 743. Second stitch pitch base circle segment. Detailed Implementation

[0041] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0042] It should be noted that when a component is said to be "set on" another component, it can be directly set on the other component or there may be an intervening component. When a component is considered to be "set on" another component, it can be directly set on the other component or there may be an intervening component. When a component is considered to be "fixed to" another component, it can be directly fixed to the other component or there may be an intervening component.

[0043] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0044] The overlock sewing machine control method claimed in this invention is used to control the lifting of the presser foot, thread cutting, lowering of the feed dog, and needle length adjustment of the overlock sewing machine.

[0045] like Figures 1 to 10 As shown, an overlock sewing machine provided in one embodiment of the present invention includes a machine housing 10, a presser foot lifting mechanism 20, a thread cutting mechanism 30, a tooth feeding mechanism 40, and a stitch length adjustment mechanism 50.

[0046] The presser foot lifting mechanism 20, the thread cutting mechanism 30, the tooth feeding mechanism 40, and the needle spacing adjustment mechanism 50 are all mounted on the housing 10.

[0047] In this embodiment, the housing 10 is provided with a drive member 60 and a cam member 70. The cam member 70 is mounted on the rotating part 61 of the drive member 60. When the overlock sewing machine of this embodiment is working, the drive member 60 can drive the presser foot lifting mechanism 20, the thread cutting mechanism 30, the dog feed mechanism 40, and the stitch length adjustment mechanism 50 respectively through the cam member 70. That is, when the overlock sewing machine is working, the automatic control of presser foot lifting, thread cutting, dog feed, and stitch length adjustment can be achieved with a single drive member 60. It should be noted that the drive member 60 on this overlock sewing machine is a motor.

[0048] like Figures 8 to 10 As shown, the cam member 70 of this embodiment has a presser foot profile 71 corresponding to the presser foot lifting mechanism 20, a thread cutting profile 72 corresponding to the thread cutting mechanism 30, a lower feed profile 73 corresponding to the lower feed mechanism 40, and a stitch pitch adjustment profile 74 corresponding to the stitch pitch adjustment mechanism 50. When the cam member 70 rotates, the presser foot profile 71, the thread cutting profile 72, the lower feed profile 73, and the stitch pitch adjustment profile 74 can act on the presser foot lifting mechanism 20, the thread cutting mechanism 30, the lower feed mechanism 40, and the stitch pitch adjustment mechanism 50 respectively, so that one of the presser foot lifting mechanism 20, the thread cutting mechanism 30, the lower feed mechanism 40, and the stitch pitch adjustment mechanism 50 can be operated at a time.

[0049] Specifically, the cam component 70 includes a first cam portion 701, a second cam portion 702, and a third cam portion 703. The rotation center lines of the first cam portion 701, the second cam portion 702, and the third cam portion 703 are arranged on the same straight line. The presser foot lifting profile 71 and the lower feed profile 73 are arranged on the outer peripheral surface of the first cam portion 701, the stitch pitch adjustment profile 74 is arranged on the outer peripheral surface of the second cam portion 702, and the thread cutting profile 72 is arranged on the outer peripheral surface of the third cam portion 703. This specifically realizes the structural arrangement of the presser foot lifting profile 71, the thread cutting profile 72, the lower feed profile 73, and the stitch pitch adjustment profile 74 on the cam component 70.

[0050] like Figure 8 As shown, the presser foot lifting mechanism 20 of this embodiment includes a presser foot roller 21, and a presser foot lifting profile 71 includes a presser foot base circular segment 711, a first presser foot involute segment 712, and a second presser foot involute segment 713. The center of the presser foot base circular segment 711 is located on the rotation center line of the cam member 70. The presser foot lifting profile 71 can push the presser foot roller 21 through the first presser foot involute segment 712 and / or the second presser foot involute segment 713 to make the presser foot lifting mechanism move. This specifically realizes the cooperation between the presser foot lifting profile 71 and the presser foot lifting mechanism 20, so that the cam member 70 can selectively move the presser foot lifting mechanism 20 by using the push of the presser foot roller 21 by the presser foot lifting profile 71.

[0051] It should be noted that when the presser foot roller 21 of the presser foot lifting mechanism 20 is against the presser foot base segment 711 of the presser foot lifting profile 71, since the center of the presser foot base segment 711 is set on the rotation center line of the cam member 70, the cam member 70 can only drive the presser foot roller 21 to rotate, and will not drive the presser foot roller 21 to swing, that is, it will not cause the presser foot lifting mechanism 20 to move. However, when the presser foot roller 21 is against the first presser foot involute segment 712 and / or the second presser foot involute segment 713, the rotation of the cam member 70 can push the presser foot roller 21 to swing, thereby causing the presser foot lifting mechanism 20 to move.

[0052] like Figure 2As shown, the presser foot lifting mechanism 20 also includes a presser foot lifting crank 22, a connecting hook 23, a lever 24, a return ring 25, a presser foot shaft 26, a presser foot arm 27, and a presser foot assembly 28. Both the presser foot lifting crank 22 and the presser foot shaft 26 are rotatably mounted on the machine housing 10. One end of the presser foot shaft 26 is connected to the presser foot assembly 28 via the presser foot arm 27, and the other end of the presser foot shaft 26 selectively engages with the lever 24 via the return ring 25. The presser foot lifting crank 22 is connected to the lever 24 via the connecting hook 23, and the presser foot roller 21 is rotatably mounted on the end of the presser foot lifting crank 22 away from the connecting hook 23. It should be noted that the specific structure of the presser foot assembly 28, and how the presser foot assembly 28 ultimately achieves the presser foot lifting operation of the overlock sewing machine after being driven by the presser foot arm 27, adopts conventional structures of existing technology and will not be elaborated upon here.

[0053] As can be seen from the above, when the first presser foot involute segment 712 and / or the second presser foot involute segment 713 on the presser foot contour 71 of the cam component 70 abut against the presser foot roller 21 and rotate, the presser foot crank 22 can be pushed by the presser foot roller 21 to swing on the housing 10, and the lever component 24 can be rotated on the presser foot shaft 26 through the connecting hook 23. By utilizing the cooperation between the lever component 24 and the reset ring 25 on the presser foot shaft 26, the rotation of the presser foot shaft 26 on the housing 10 can be realized, and the presser foot assembly 28 can be driven by the transmission of the presser foot arm 27.

[0054] like Figure 3 As shown, the lever 24 is rotatably mounted on the presser foot shaft 26. The lever 24 is provided with a pushing protrusion 241, and the reset ring 25 is provided with a stop 251 that matches the pushing protrusion 241. The lever 24 can drive the pushing protrusion 241 to push the stop 251, and can drive the presser foot shaft 26 to rotate relative to the housing 10 through the reset ring 25.

[0055] Specifically, when the lever 24 rotates counterclockwise, the abutting protrusion 241 on the lever 24 can push the stop block 251 and drive the reset ring 25 to rotate counterclockwise, but the counterclockwise rotation of the reset ring 25 will not drive the rotation of the lever 24; when the reset ring 25 rotates clockwise, the stop block 251 on the reset ring 25 can push the abutting protrusion 241 and drive the lever 24 to rotate clockwise, but the clockwise rotation of the lever 24 will not drive the clockwise rotation of the reset ring 25.

[0056] like Figure 10As shown, the wire cutting mechanism 30 includes a wire cutting roller 31, and the wire cutting profile 72 includes a wire cutting base circular segment 721, a first wire cutting involute segment 722, and a second wire cutting involute segment 723. The center of the wire cutting base circular segment 721 is located on the rotation center line of the cam member 70. The wire cutting profile 72 can push the wire cutting roller 31 through the first wire cutting involute segment 722 and / or the second wire cutting involute segment 723 to make the wire cutting mechanism 30 move. This specifically realizes the cooperation between the wire cutting profile 72 and the wire cutting mechanism 30, so that the cam member 70 can selectively move the wire cutting mechanism 30 by using the pushing of the wire cutting roller 31 by the wire cutting profile 72. It should be noted that the working principle of the cooperation between the shearing profile 72 on the cam component 70 and the shearing roller 31 abutting against the shearing profile 72 is the same as the working principle of the cooperation between the lifting foot profile 71 and the pressing foot roller 21 abutting against the lifting foot profile 71, and will not be elaborated here.

[0057] like Figure 4 As shown, the thread cutting mechanism 30 also includes a guide seat 32, a sliding shaft 33, a thread cutting fork 34, a thread cutting connecting rod 35, a thread cutting crank 36, and a thread cutting knife assembly 37. The sliding shaft 33 is slidably mounted on the guide seat 32. The thread cutting fork 34 is mounted on one end of the sliding shaft 33 extending out of the guide seat 32. One end of the thread cutting fork 34 is connected to the thread cutting crank 36 via the thread cutting connecting rod 35. The thread cutting roller 31 is rotatably mounted on the other end of the thread cutting fork 34. The thread cutting knife assembly 37 is mounted on the end of the thread cutting crank 36 away from the thread cutting connecting rod 35. It should be noted that the specific structure of the thread cutting knife assembly 37, and how the thread cutting knife assembly 37 ultimately achieves the thread cutting operation of the overlock sewing machine after being driven by the thread cutting crank 36, adopts the conventional structure of existing technology, and will not be elaborated here.

[0058] As can be seen from the above, when the first involute segment 722 and / or the second involute segment 723 on the wire-cutting profile 72 of the cam member 70 abut against the wire-cutting roller 31 and rotate, the wire-cutting roller 31 can push the wire-cutting slide fork 34 to swing, and under the transmission of the wire-cutting connecting rod 35 and the wire-cutting crank 36, the wire-cutting knife assembly 37 can be driven. It should be noted that the sliding shaft 33 of the wire-cutting mechanism 30 is engaged with a retaining spring (not shown) on the guide seat 32, and a spring (not shown) is provided in a pre-compressed manner between the retaining spring and the guide seat 32. The elastic force of the spring is used to achieve elastic reset of the sliding shaft 33, thereby ensuring that the wire-cutting roller 31 on the wire-cutting mechanism 30 always abuts against the wire-cutting profile 72 of the cam member 70.

[0059] like Figure 5 , Figure 8As shown, the lower tooth supply mechanism 40 includes a lower supply roller 41, and the lower supply profile 73 includes a first lower supply base circle segment 731, a lower supply involute segment 732, and a second lower supply base circle segment 733. The center of the first lower supply base circle segment 731 is located on the rotation center line of the cam member 70. The lower supply profile 73 can push the lower supply roller 41 through the lower supply involute segment 732 and / or the second lower supply base circle segment 733 to make the lower tooth supply mechanism 40 move. This specifically realizes the cooperation between the lower supply profile 73 and the lower tooth supply mechanism 40, so that the cam member 70 can selectively move the lower tooth supply mechanism 40 by using the pushing of the lower supply roller 41 by the lower supply profile 73. It should be noted that a preset distance is provided between the center of the second lower supply base segment 733 and the first lower supply base segment 731. The working principle of the cooperation between the upper and lower supply contours 73 of the cam component 70 and the lower supply roller 41 that abuts against the lower supply contour 73 is the same as the working principle of the cooperation between the lifting foot contour 71 and the pressing foot roller 21 that abuts against the lifting foot contour 71, and will not be elaborated here.

[0060] like Figure 5 As shown, the lower feed mechanism 40 includes a connecting sleeve 42, a drive shaft 43, a lower feed crank 44, and a feed holder 45. The connecting sleeve 42 is mounted on the housing 10. The drive shaft 43 passes through the connecting sleeve 42, with one end of the drive shaft 43 extending out of the connecting sleeve 42 having an eccentric portion 431 that passes through the opening slot 451 of the feed holder 45. The lower feed crank 44 is mounted on the other end of the drive shaft 43 extending out of the connecting sleeve 42, and the lower feed roller 41 is rotatably mounted on the lower feed crank 44. It should be noted that a torsion spring is provided on the lower feed crank 44 so that the lower feed roller 41 on the lower feed crank 44 can always be in contact with the lower feed profile 73 of the cam member 70. The specific structure of the feed holder 45, as well as the connection relationship between the feed holder 45 and other components such as the main shaft 46, adopts the conventional structure of the prior art and will not be elaborated here.

[0061] As can be seen from the above, when the lower feed contour 73 of the cam member 70, the lower feed involute segment 732 and / or the second lower feed base circle segment 733, abut against the lower feed roller 41 and rotate, the lower feed roller 41 can push the lower feed crank 44 to swing. Since the lower feed crank 44 is fixedly connected to the drive shaft 43, the drive shaft 43 and the eccentric part 431 can be driven to rotate. Then, by utilizing the eccentricity of the eccentric part 431, the eccentric part 431 drives the gear frame 45 to move up and down around the main shaft 46.

[0062] like Figure 6 , Figure 10As shown, the stitch pitch adjustment mechanism 50 includes a stitch pitch roller 51, and the stitch pitch adjustment profile 74 includes a first stitch pitch base circle segment 741, a stitch pitch involute segment 742, and a second stitch pitch base circle segment 743. The center of the first stitch pitch base circle segment 741 is located on the rotation center line of the cam member 70. The stitch pitch adjustment profile 74 can push the stitch pitch roller 51 through the stitch pitch involute segment 742 and / or the second stitch pitch base circle segment 743 to activate the stitch pitch adjustment mechanism 50. It should be noted that there is a certain distance between the center of the second stitch pitch base circle segment 743 and the center of the first stitch pitch base circle segment 741. The working principle of the engagement between the stitch pitch adjustment profile 74 on the cam member 70 and the stitch pitch roller 51 abutting against the stitch pitch adjustment profile 74 is the same as the working principle of the engagement between the presser foot profile 71 and the presser foot roller 21 abutting against the presser foot profile 71, which will not be elaborated here.

[0063] like Figure 6 As shown, the stitch length adjustment mechanism 50 includes a main shaft motor 52, a fabric feeding assembly 53, a first crank 54, a crank connecting assembly 55, a drive shaft 56, and a second crank 57. The fabric feeding assembly 53 is mounted on the rotating shaft 521 of the main shaft motor 52. The fabric feeding assembly 53 is provided with a needle opening groove 531. One end of the first crank 54 is provided with a stitch length adjustment component 541. The first crank 54 can drive the stitch length adjustment component 541 to engage in the needle opening groove 531. The other end of the first crank 54 is connected to the drive shaft 56 through the crank connecting assembly 55. The second crank 57 is mounted on the drive shaft 56, and the stitch length roller 51 is rotatably mounted on the second crank 57. It should be noted that when the stitch length adjustment component 541 on the first crank 54 is engaged in the needle slot 531 of the fabric feeding assembly 53, the fabric feeding assembly 53 can be in a stitch length adjustment state. Afterwards, the main shaft motor 52 drives the fabric feeding assembly 53 to rotate a certain angle through the rotating shaft part 521, thereby realizing the stitch length adjustment of the fabric feeding assembly 53. When the stitch length adjustment component 541 on the first crank 54 is disengaged from the needle slot 531 of the fabric feeding assembly 53, the fabric feeding assembly 53 is in a stitch length locked state. It should also be noted that the stitch length adjustment mechanism 50 is also provided with a torsion spring (not shown in the figure). The torsion spring can be specifically set on one of the transmission components of the stitch length adjustment mechanism 50. Utilizing the elastic effect of the torsion spring, the stitch length roller 51 on the stitch length adjustment mechanism 50 can always be in contact with the stitch length adjustment contour 74 of the cam component 70.

[0064] As can be seen from the above, when the involute segment 742 and / or the base circle segment 743 of the stitch pitch on the stitch pitch adjustment profile 74 of the cam 70 abut against the stitch pitch roller 51 and rotate, the stitch pitch roller 51 can push the second crank 57 to swing, thereby driving the rotation of the transmission shaft 56. Then, under the transmission of the crank connecting assembly 55, the first crank 54 is oscillated, thereby achieving the purpose of controlling the stitch pitch adjustment member 541 on the first crank 54 to selectively engage with the needle slot 531 on the fabric feeding assembly 53.

[0065] like Figure 7 As shown, the crank connection assembly 55 includes a third crank 551, a crank connecting rod 552, a fourth crank 553, and a mounting shaft 554. One end of the third crank 551 is mounted on the drive shaft 56 away from the end of the second crank 57. The other end of the third crank 551 is connected to the fourth crank 553 through the crank connecting rod 552. The mounting shaft 554 is rotatably mounted on the housing 10. The fourth crank 553 and the first crank 54 are respectively connected to the mounting shaft 554, thereby specifically realizing the structural setting of the crank connection assembly 55.

[0066] As can be seen from the above, the overlock sewing machine control method of the present invention includes:

[0067] Get the current status of the overlock sewing machine;

[0068] Based on the target state of the overlock sewing machine, the control drive 60 drives the cam 70 to rotate, causing the presser foot lifting profile 71, thread cutting profile 72, feed profile 73 or stitch length adjustment profile 74 on the cam 70 to drive the corresponding presser foot lifting mechanism 20, thread cutting mechanism 30, feed tooth mechanism 40 or stitch length adjustment mechanism 50 to switch the overlock sewing machine from the current state to the target state.

[0069] The cam component 70 has a timing zero position. When the drive component 60 controls the cam component 70 to be in the timing zero position, the presser foot lifting mechanism 20, the thread cutting mechanism 30, the tooth feed mechanism 40, and the stitch length adjustment mechanism 50 are all inactive. This specifically achieves the initial position setting of the cam component 70 during the operation of the overlock sewing machine, facilitating the control of the overlock sewing machine while meeting the normal operation requirements. It should be noted that when the cam component 70 is in the timing zero position, it specifically means that the contour corresponding to the cam component 70 being in the timing zero position causes the presser foot lifting mechanism 20, the thread cutting mechanism 30, the tooth feed mechanism 40, and the stitch length adjustment mechanism 50 to be inactive.

[0070] Furthermore, the timing zero position of the cam component 70 is set to a preset range so that the drive component 60 can control the cam component 70 to be at the position of the timing zero position.

[0071] When the drive unit 60 controls the cam 70 to rotate counterclockwise from its timing zero position within a preset angle A, the cam 70 acts on the presser foot lifting mechanism 20, so that the overlock sewing machine is in the presser foot lifting sequence. During this process, the thread cutting mechanism 30, the tooth feeding mechanism 40, and the stitch length adjustment mechanism 50 do not operate, thus specifically realizing the presser foot lifting control during the operation of the overlock sewing machine. It should be noted that the preset angle A is the angle range in which the cam 70 rotates counterclockwise from its timing contour, and the rotation of the cam 70 within this range constitutes the presser foot lifting sequence of the overlock sewing machine.

[0072] When the drive unit 60 controls the cam unit 70 to rotate counterclockwise within a preset angle B after the preset angle A, the cam unit 70 acts on the tooth feeding mechanism 40 to put the overlock sewing machine into the tooth feeding sequence. During this process, the thread cutting mechanism 30 and the stitch length adjustment mechanism 50 do not operate, and the presser foot lifting mechanism 20 is in the completed state, that is, the presser foot lifting mechanism 20 has completed lifting the presser foot. This specifically realizes the control of the tooth feeding during the operation of the overlock sewing machine. It should be noted that the preset angle B is the angle range of the cam unit 70's counterclockwise rotation after the preset angle A, and the rotation of the cam unit 70 within this range is the tooth feeding sequence of the overlock sewing machine.

[0073] When the drive unit 60 controls the cam 70 to rotate counterclockwise within a preset angle C after the preset angle A plus a preset angle B, the cam 70 acts on the stitch length adjustment mechanism 50 to put the overlock sewing machine into the stitch length adjustment sequence. During this process, the thread cutting mechanism 30 does not operate, and the presser foot lifting mechanism 20 and the tooth lowering mechanism 40 are in the completed operation state, thereby specifically realizing the control of stitch length adjustment during the operation of the overlock sewing machine. It should be noted that the preset angle C is the angle range of the cam 70 rotating counterclockwise after the preset angle A plus the preset angle B, and the rotation of the cam 70 within this range is the stitch length adjustment sequence of the overlock sewing machine.

[0074] When the drive unit 60 controls the cam unit 70 to rotate clockwise within a preset angle D at the timing zero position, the cam unit 70 acts on the thread-cutting mechanism 30 to put the overlock sewing machine into the thread-cutting sequence. During this process, the presser foot lifting mechanism 20, the tooth feeding mechanism 40, and the stitch length adjustment mechanism 50 do not operate, thereby specifically realizing the control of thread cutting during the operation of the overlock sewing machine. It should be noted that the preset angle D is the angle range of clockwise rotation of the cam unit 70 after the timing zero position, and the rotation of the cam unit 70 within this range is the thread-cutting sequence of the overlock sewing machine.

[0075] When the drive unit 60 controls the cam 70 to rotate clockwise within a preset angle E after the preset angle D, the cam 70 acts on the stitch length adjustment mechanism 50 to put the overlock sewing machine into the stitch length adjustment sequence. During this process, the presser foot lifting mechanism 20, the thread cutting mechanism 30, and the tooth feeding mechanism 40 do not operate. The thread cutting mechanism 30 is in the thread cutting position, thereby specifically realizing the control of stitch length adjustment during the operation of the overlock sewing machine. It should be noted that the preset angle E is the angle range of clockwise rotation of the cam 70 after the preset angle D, and the rotation of the cam 70 within this range is the stitch length adjustment sequence of the overlock sewing machine.

[0076] As can be seen from the above, the control method of this overlock sewing machine specifically divides the 360° rotation of the cam component 70 into time sequences.

[0077] like Figure 11 , Figure 12As shown, when the overlock sewing machine is working, the drive unit 60 controls the cam unit 70 to rotate counterclockwise from the timing zero position within a preset angle A, thereby realizing the lifting action of the presser foot of the overlock sewing machine. Specifically, the height of the presser foot can be adjusted by controlling the angle of the cam unit 70 within the preset angle A through the drive unit 60. After the action is completed, the drive unit 60 drives the cam unit 70 to rotate clockwise and reset to the timing zero position.

[0078] When the overlock sewing machine encounters thick material and the presser foot has been raised to the highest position, the drive unit 60 controls the cam unit 70 to continue to drive counterclockwise on the basis of the original counterclockwise rotation preset angle A. Specifically, the cam unit 70 is controlled to rotate counterclockwise within the preset angle B to achieve the tooth feeding sequence. After the action is completed, the drive unit 60 drives the cam unit 70 to rotate clockwise and reset to the timing zero position.

[0079] When the overlock sewing machine needs to adjust the stitch length, the drive unit 60 controls the cam unit 70 to rotate counterclockwise by a preset angle A plus a preset angle B. That is, after the presser foot is lifted and the teeth are fed downwards, the overlock sewing machine continues to drive the cam unit 70 to adjust counterclockwise within a preset angle C and achieve the stitch length adjustment sequence. After the action is completed, the drive unit 60 drives the cam unit 70 to rotate clockwise and reset to the timing zero position.

[0080] When the overlock sewing machine needs to cut the thread, the drive unit 60 controls the cam unit 70 to rotate clockwise from the timing zero position within a preset angle D to achieve the thread cutting timing and realize the thread cutting action. After the action is completed, the drive unit 60 drives the cam unit 70 to rotate counterclockwise and reset to the timing zero position.

[0081] like Figure 13 , Figure 14 As shown, when the overlock sewing machine is working, the drive unit 60 controls the cam unit 70 to rotate counterclockwise from the timing zero position within a preset angle A, thereby realizing the lifting action of the presser foot of the overlock sewing machine. Specifically, the height of the presser foot can be adjusted by controlling the angle of the cam unit 70 within the preset angle A through the drive unit 60. After the action is completed, the drive unit 60 drives the cam unit 70 to rotate clockwise and reset to the timing zero position.

[0082] When the overlock sewing machine encounters thick material and the presser foot has been raised to the highest position, the drive unit 60 controls the cam unit 70 to continue to drive counterclockwise on the basis of the original counterclockwise rotation preset angle A. Specifically, the cam unit 70 is controlled to rotate counterclockwise within the preset angle B to achieve the tooth feeding sequence. After the action is completed, the drive unit 60 drives the cam unit 70 to rotate clockwise and reset to the timing zero position.

[0083] When the overlock sewing machine needs to cut the thread, the drive unit 60 controls the cam unit 70 to rotate clockwise from the timing zero position within a preset angle D to achieve the thread cutting timing and realize the thread cutting action. After the action is completed, the drive unit 60 drives the cam unit 70 to rotate counterclockwise and reset to the timing zero position.

[0084] When the overlock sewing machine needs to adjust the stitch length, the drive unit 60 controls the cam unit 70 to rotate clockwise by a preset angle D. That is, after the overlock sewing machine has cut the thread, it continues to drive the cam unit 70 to adjust clockwise within a preset angle E and achieve the stitch length adjustment sequence. After the action is completed, the drive unit 60 drives the cam unit 70 to rotate counterclockwise and reset to the timing zero position.

[0085] In summary, the overlock sewing machine of the present invention, through the above-mentioned reasonable structural design, enables the overlock sewing machine to control different rotation angles with a single drive unit 60, thereby achieving automatic control of lifting the presser foot, cutting the thread, feeding the needle, and adjusting the stitch length. This simplifies the structure and reduces costs.

[0086] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0087] Those skilled in the art should recognize that the above embodiments are merely illustrative of the present invention and are not intended to limit the present invention. Any appropriate changes and variations made to the above embodiments within the essential spirit of the present invention fall within the scope of protection claimed by the present invention.

Claims

1. A control method for an overlock sewing machine, the overlock sewing machine comprising a drive component (60), a cam component (70), a presser foot lifting mechanism (20), a thread cutting mechanism (30), a tooth feed mechanism (40), and a stitch length adjustment mechanism (50), wherein the cam component (70) is mounted on the drive component (60), and the cam component (70) is provided with a presser foot profile (71), a thread cutting profile (72), a feed profile (73), and a stitch length adjustment profile (74) respectively corresponding to and cooperating with the presser foot lifting mechanism (20), the thread cutting mechanism (30), the tooth feed mechanism (40), and the stitch length adjustment mechanism (50); characterized in that, The overlock sewing machine control method includes: Get the current status of the overlock sewing machine; Based on the target state of the overlock sewing machine, the control drive (60) drives the cam (70) to rotate, so that the presser foot contour (71), thread trimming contour (72), feed contour (73) or stitch length adjustment contour (74) on the cam (70) drive the corresponding presser foot mechanism (20), thread trimming mechanism (30), tooth feed mechanism (40) or stitch length adjustment mechanism (50) to move, so that the overlock sewing machine switches from the current state to the target state; The lower feed mechanism (40) includes a lower feed roller (41) abutting against the lower feed contour (73), a connecting sleeve (42), a drive shaft (43), a lower feed crank (44), and a tooth frame (45). The connecting sleeve (42) is installed on the housing (10) of the overlock sewing machine, and the drive shaft (43) is installed through the connecting sleeve (42). The end of the drive shaft (43) extending out of the connecting sleeve (42) has an eccentric part (431), which passes through the opening slot (451) of the tooth frame (45). The lower feed crank (44) is installed on the other end of the drive shaft (43) extending out of the connecting sleeve (42), and the lower feed roller (41) is rotatably installed on the lower feed crank (44). The lower feed profile (73) includes a first lower feed base circle segment (731), a lower feed involute segment (732), and a second lower feed base circle segment (733). The center of the first lower feed base circle segment (731) is located on the rotation center line of the cam member (70). The lower feed profile (73) can push the lower feed roller (41) through the lower feed involute segment (732) and / or the second lower feed base circle segment (733) to make the tooth lower feed mechanism (40) move.

2. The overlock sewing machine control method according to claim 1, characterized in that: The cam (70) has a timing zero position, and when the drive (60) controls the cam (70) to be in the timing zero position, the presser foot lifting mechanism (20), the wire cutting mechanism (30), the tooth feeding mechanism (40) and the needle length adjustment mechanism (50) do not operate.

3. The overlock sewing machine control method according to claim 2, characterized in that: When the drive member (60) controls the cam member (70) to rotate counterclockwise from the zero position within a preset angle A, the cam member (70) acts on the presser foot lifting mechanism (20) to put the overlock sewing machine in the presser foot lifting timing segment. During this process, the thread cutting mechanism (30), the tooth feeding mechanism (40), and the stitch length adjustment mechanism (50) do not operate.

4. The overlock sewing machine control method according to claim 3, characterized in that: When the drive member (60) controls the cam member (70) to rotate counterclockwise within a preset angle B after the preset angle A, the cam member (70) acts on the tooth feeding mechanism (40) to make the overlock sewing machine in the tooth feeding sequence. During this process, the thread cutting mechanism (30) and the stitch length adjustment mechanism (50) do not operate, and the presser foot lifting mechanism (20) is in the state of completed operation.

5. The overlock sewing machine control method according to claim 4, characterized in that: When the drive member (60) controls the cam member (70) to rotate counterclockwise within a preset angle C after the preset angle A plus the preset angle B, the cam member (70) acts on the stitch length adjustment mechanism (50) to put the overlock sewing machine in the stitch length adjustment sequence. During this process, the thread cutting mechanism (30) does not operate, and the presser foot lifting mechanism (20) and the tooth lowering mechanism (40) are in the state of completed operation.

6. The overlock sewing machine control method according to claim 2, characterized in that: When the drive member (60) controls the cam member (70) to rotate clockwise from the zero position within a preset angle D, the cam member (70) acts on the thread cutting mechanism (30) to put the overlock sewing machine in the thread cutting sequence. During this process, the presser foot lifting mechanism (20), the tooth feeding mechanism (40), and the stitch length adjustment mechanism (50) do not operate.

7. The overlock sewing machine control method according to claim 6, characterized in that: When the drive member (60) controls the cam member (70) to rotate clockwise within a preset angle E after a preset angle D, the cam member (70) acts on the stitch length adjustment mechanism (50) to put the overlock sewing machine in the stitch length adjustment sequence. During this process, the presser foot lifting mechanism (20), the thread cutting mechanism (30) and the tooth feeding mechanism (40) do not operate, wherein the thread cutting mechanism (30) is in the thread cutting position.

8. The overlock sewing machine control method according to any one of claims 2-7, characterized in that: The timing zero position of the cam component (70) is set to a preset range.

9. The overlock sewing machine control method according to claim 1, characterized in that: The cam member (70) has a presser foot profile (71) corresponding to the presser foot lifting mechanism (20), a wire cutting profile (72) corresponding to the wire cutting mechanism (30), a lower supply profile (73) corresponding to the lower supply mechanism (40), and a stitch length adjustment profile (74) corresponding to the stitch length adjustment mechanism (50). The drive member (60) can act on the presser foot lifting mechanism (20), the wire cutting mechanism (30), the lower supply mechanism (40), and the stitch length adjustment mechanism (50) respectively through the presser foot lifting profile (71), the wire cutting profile (72), the lower supply profile (73), and the stitch length adjustment profile (74) on the cam member (70).

10. The overlock sewing machine control method according to claim 9, characterized in that: The cam component (70) includes a first cam portion (701), a second cam portion (702), and a third cam portion (703). The rotation center line of the first cam portion (701), the rotation center line of the second cam portion (702), and the rotation center line of the third cam portion (703) are arranged on the same straight line. The lifting foot contour (71) and the lower supply contour (73) are arranged on the outer peripheral surface of the first cam portion (701), the stitch length adjustment contour (74) is arranged on the outer peripheral surface of the second cam portion (702), and the thread cutting contour (72) is arranged on the outer peripheral surface of the third cam portion (703).

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