Double-drive linkage structure for sewing machine

Abstract

The application discloses a double-drive linkage structure for a sewing machine, which comprises a cutter movement assembly, a presser foot movement assembly, a double-drive linkage device, a cutter linkage assembly and a presser foot linkage assembly. The cutter movement assembly comprises a cutter seat which is arranged in a sliding mode. The presser foot movement assembly comprises a presser foot seat which is arranged in a sliding mode. The double-drive linkage device is arranged in a rotating mode and is provided with a first guide rail and a second guide rail. The cutter linkage assembly comprises a first driving member which is provided with a first switching linkage part. The switching linkage part is matched with the first guide rail or the second guide rail. The presser foot linkage assembly comprises a fifth driving member which is provided with a second switching linkage part. The second switching linkage part is arranged in an eccentric rotating mode on the double-drive linkage device. The double-drive linkage structure for the sewing machine can control whether the cutter works and whether the presser foot is lifted through the double-drive linkage device.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of sewing machine structure, and particularly relates to a double-drive linkage structure for a sewing machine and the sewing machine. BACKGROUND

[0002] A sewing machine is a machine that uses one or more sewing threads to form one or more stitches on a piece of fabric, interlocking or joining together one or more pieces of fabric.

[0003] The sewing machine comprises a frame, an upper linkage mechanism and a lower linkage mechanism. The upper linkage mechanism comprises a sewing needle movement assembly, a presser foot movement assembly and a cutter movement assembly. The lower linkage mechanism comprises a feed dog movement assembly and a rotating shuttle movement assembly. The sewing machine places the fabric to be sewn between the feed dog and the presser foot. During the operation of the sewing machine, the sewing needle movement assembly drives the sewing needle to pierce downward through the fabric, and the rotating shuttle movement assembly cooperates to complete the orderly threading of the sewing thread. Simultaneously, the presser foot movement assembly and the feed dog movement assembly move to flatten the fabric during the downward piercing of the sewing needle, thereby achieving accurate sewing, and to transmit the fabric after a single sewing of the sewing needle, thereby achieving continuous sewing.

[0004] In addition, the sewing machine includes two special actions: 1. a presser foot lifting action, which controls the presser foot to lift up to facilitate the removal of the fabric from between the presser foot and the feed dog or the adjustment of the direction; and 2. a sewing thread cutting action, which connects the cutter movement assembly to act after the sewing is completed, thereby cutting the sewing thread during the operation of the sewing machine. The presser foot lifting action and the sewing thread cutting action can be combined in four ways: 1. the presser foot is lifted and the sewing thread is cut; 2. the presser foot is not lifted and the sewing thread is cut; 3. the presser foot is lifted and the sewing thread is not cut; and 4. the presser foot is not lifted and the sewing thread is not cut.

[0005] However, in the existing sewing machine, the two special actions are independently set, i.e., a separate linkage is provided to control the lifting of the presser foot, and a separate linkage is provided to control the connection of the cutter assembly, thereby causing the need to control two linkages and confirm the state when adjusting to any of the four states described above, which makes the adjustment operation complex and prone to errors. SUMMARY

[0006] In view of the deficiencies of the prior art, the present application aims to provide a double-drive linkage structure for a sewing machine that controls the operation of the cutter and the lifting of the presser foot through a double-drive linkage.

[0007] To achieve the above-mentioned purpose, the present application provides the following technical solutions:

[0008] The application discloses a double-drive linkage structure for a sewing machine, which comprises a cutter movement assembly, a presser foot movement assembly, a double-drive linkage device, a cutter linkage assembly and a presser foot linkage assembly.

[0009] The application further provides that the cutter movement assembly comprises a first connecting member, a second connecting member and a third connecting member, the first connecting member is rotationally installed, the first connecting member is provided with a first connecting part and a second connecting part, the first connecting part is used for being driven by a power mechanism, the second connecting member is provided with a third connecting part and a fourth connecting part, the third connecting part is connected with the second connecting part to link the first connecting member and the second connecting member, the third connecting member is provided with a fifth connecting part and a sixth connecting part, a connecting shaft is arranged between the fifth connecting part and the fourth connecting part to hinge the second connecting member and the third connecting member, the sixth connecting part is hinged to the cutter seat to link and drive the sliding movement of the cutter seat, and the cutter linkage assembly is hinged to the connecting shaft, so that when the first driving member is matched in the first guide rail, the connecting shaft is driven to be coaxial with the rotation axis of the first connecting member, and when the first driving member is matched in the second guide rail, the connecting shaft is driven to be non-coaxial with the rotation axis of the first connecting member.

[0010] The application further provides that the power mechanism comprises a power member, the power member is provided with a seventh connecting part and an eighth connecting part, the seventh connecting part is driven to act, and the eighth connecting part is connected with the first connecting part to drive the first connecting member by the power mechanism.

[0011] The application further provides that the power member is provided with an eccentric seat at the seventh connecting part, the eccentric seat is provided with an eccentric hole, and the eccentric hole is used for being connected with the upper shaft to rotate the upper shaft and drive the power member to move by eccentricity.

[0012] The sewing machine further comprises a sewing needle movement assembly, the sewing needle movement assembly comprises a sewing needle seat provided with a sewing needle, a fourth connecting piece and a fifth connecting piece, the sewing needle seat is slidably arranged, the fourth connecting piece is eccentrically rotatably arranged on an eccentric seat, and the fifth connecting piece is hingedly connected with the sewing needle seat and the fourth connecting piece respectively, so that rotation of the eccentric seat drives the sewing needle seat to reciprocatingly slide through the fourth connecting piece and the fifth connecting piece.

[0013] The sewing machine further comprises a sewing needle movement assembly, the sewing needle movement assembly comprises a sewing needle seat provided with a sewing needle, a fourth connecting piece and a fifth connecting piece, the sewing needle seat is slidably arranged, the fourth connecting piece is eccentrically rotatably arranged on an eccentric seat, and the fifth connecting piece is hingedly connected with the sewing needle seat and the fourth connecting piece respectively, so that rotation of the eccentric seat drives the sewing needle seat to reciprocatingly slide through the fourth connecting piece and the fifth connecting piece.

[0014] The sewing machine further comprises a sewing needle movement assembly, the sewing needle movement assembly comprises a sewing needle seat provided with a sewing needle, a fourth connecting piece and a fifth connecting piece, the sewing needle seat is slidably arranged, the fourth connecting piece is eccentrically rotatably arranged on an eccentric seat, and the fifth connecting piece is hingedly connected with the sewing needle seat and the fourth connecting piece respectively, so that rotation of the eccentric seat drives the sewing needle seat to reciprocatingly slide through the fourth connecting piece and the fifth connecting piece.

[0015] The sewing machine further comprises a sewing needle movement assembly, the sewing needle movement assembly comprises a sewing needle seat provided with a sewing needle, a fourth connecting piece and a fifth connecting piece, the sewing needle seat is slidably arranged, the fourth connecting piece is eccentrically rotatably arranged on an eccentric seat, and the fifth connecting piece is hingedly connected with the sewing needle seat and the fourth connecting piece respectively, so that rotation of the eccentric seat drives the sewing needle seat to reciprocatingly slide through the fourth connecting piece and the fifth connecting piece.

[0016] The sewing machine further comprises a sewing needle movement assembly, the sewing needle movement assembly comprises a sewing needle seat provided with a sewing needle, a fourth connecting piece and a fifth connecting piece, the sewing needle seat is slidably arranged, the fourth connecting piece is eccentrically rotatably arranged on an eccentric seat, and the fifth connecting piece is hingedly connected with the sewing needle seat and the fourth connecting piece respectively, so that rotation of the eccentric seat drives the sewing needle seat to reciprocatingly slide through the fourth connecting piece and the fifth connecting piece.

[0017] The sewing machine further comprises a sewing needle movement assembly, the sewing needle movement assembly comprises a sewing needle seat provided with a sewing needle, a fourth connecting piece and a fifth connecting piece, the sewing needle seat is slidably arranged, the fourth connecting piece is eccentrically rotatably arranged on an eccentric seat, and the fifth connecting piece is hingedly connected with the sewing needle seat and the fourth connecting piece respectively, so that rotation of the eccentric seat drives the sewing needle seat to reciprocatingly slide through the fourth connecting piece and the fifth connecting piece. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application or in the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description only show some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without any creative effort.

[0019] Figure 1 It is an assembly view of the first embodiment of the present application;

[0020] Figure 2 It is an exploded view of the first embodiment of the present application;

[0021] Figure 3 It is a partial enlarged view of A in the figure; Figure 2

[0022] Figure 4 ​Parts drawing of the double drive linkage in the first embodiment of the present application;

[0023] Figure 5 Assembly drawing of the sewing needle movement assembly part in the first embodiment of the present application;

[0024] Figure 6 Parts drawing of the eccentric seat in the first embodiment of the present application;

[0025] Figure 7 Assembly drawing of the presser foot movement assembly part in the first embodiment of the present application;

[0026] Figure 8 Parts drawing of Figure 1 Enlarged view of B;

[0027] Figure 9 Assembly drawing of the cutter movement assembly and the cutter linkage assembly in the first embodiment of the present application;

[0028] Figure 10 Exploded view of the cutter movement assembly and the cutter linkage assembly in the first embodiment of the present application;

[0029] Figure 11 Assembly drawing of the cutter movement assembly and the power mechanism in the first embodiment of the present application;

[0030] Figure 12 Assembly drawing of the cutter movement assembly and the power mechanism in the first embodiment of the present application;

[0031] Figure 13 Parts drawing of the power member in the first embodiment of the present application.

[0032] Labels: 1. Dual-drive linkage; 11. First guide rail; 12. Second guide rail; 2. Sewing needle motion assembly; 21. Sewing needle holder; 22. Fourth connecting piece; 23. Fifth connecting piece; 3. Cutting knife motion assembly; 31. Cutting knife holder; 32. First connecting piece; 33. Second connecting piece; 34. Third connecting piece; 35. Coupling shaft; 321. First connecting part; 322. Second connecting part; 331. Third connecting part; 332. Fourth connecting part; 341. Fifth connecting part; 342. Sixth connecting part; 4. Presser foot motion assembly; 41. Presser foot seat; 42. Feed fork; 43. First crank; 44. Feed swing shaft; 45. Feed rod sleeve; 46. Feed swing rod; 47. Pressure rod; 48. Pressure rod frame; 411. Second 451. First hole; 461. Sliding pin; 462. Rocker arm slider; 5. Cutter linkage assembly; 51. First drive component; 52. First switching linkage part; 53. Second drive component; 54. Third drive component; 55. Fourth drive component; 6. Presser foot linkage assembly; 61. Fifth drive component; 62. Second switching linkage part; 63. Sixth drive component; 64. Seventh drive component; 7. Power component; 71. Seventh connecting part; 72. Eighth connecting part; 73. Ninth connecting part; 81. Tooth lifting output component; 82. Sixth connecting part; 83. Tooth lifting crank; 91. Upper shaft; 92. Differential shaft; 93. Motor plate; 94. Eccentric seat; 95. Eccentric hole; 96. First rotating shaft; 97. Tension spring; 98. First hinge point. Detailed Implementation

[0033] To enable those skilled in the art to better understand the present invention and to more clearly define the scope of protection of the present invention, the present invention will be described in detail below with reference to certain specific embodiments. It should be noted that the following are only some specific embodiments of the present invention, and are merely a part of the embodiments of the present invention. The specific and direct descriptions of related structures are only for the convenience of understanding the present invention, and the specific features do not necessarily or directly limit the scope of the present invention. Conventional choices and substitutions made by those skilled in the art under the guidance of the present invention should be considered within the scope of protection of the present invention.

[0034] Example 1:

[0035] like Figures 1-4 As shown, this invention discloses a dual-drive linkage structure for a sewing machine, comprising:

[0036] The upper shaft 91 (power mechanism) is set to rotate circumferentially after being assembled into the sewing machine, and its length extends to the left and right sides;

[0037] The differential shaft 92 (power mechanism) is installed in the sewing machine and is set to reciprocate, with its length extending to the left and right.

[0038] Sewing needle movement assembly 2, which comprises a sewing needle seat 21 provided with a sewing needle, the sewing needle seat 21 is assembled to the sewing machine and arranged to slide vertically;

[0039] Cutter movement assembly 3, which comprises a cutter seat 31 provided with a cutter, the cutter seat 31 is assembled to the sewing machine and arranged to slide vertically;

[0040] Presser foot movement assembly 4, which comprises a presser foot seat 41 provided with a presser foot, the presser foot seat 41 is assembled to the sewing machine and arranged to slide vertically;

[0041] So that the upper shaft 91 drives the sewing needle seat 21 and the cutter seat 31 respectively, so that the circumferential rotation of the upper shaft 91 drives the sewing needle seat 21 and the cutter seat 31 to reciprocatingly move up and down, and the differential shaft 92 drives the cutter seat 31, so that the reciprocating rotation of the differential shaft 92 drives the presser foot seat 41 to reciprocatingly move up and down.

[0042] In addition, the embodiment also includes a double-drive linkage 1 (in the shape of a disc), the center of the double-drive linkage 1 is arranged to rotate, in addition, one end of the double-drive linkage 1 is provided with a first guide rail 11 (slotted) and a second guide rail 12 (slotted) that are in communication with each other, the first guide rail 11 and the second guide rail 12 are arranged in an arc shape coaxial with the rotation axis of the double-drive linkage 1, and the radii of the first guide rail 11 and the second guide rail 12 are different.

[0043] In addition, the embodiment also includes a cutter linkage assembly 5, which comprises a first driving member 51 in the shape of a long strip, the length of the first driving member 51 is assembled to the motor plate 93 (a structure on the sewing machine) in the middle by means of a latch or the like, and is arranged to rotate, and one end of the length is provided with a first switching linkage part 52 in the shape of a cylinder, the first switching linkage part 52 is fitted in the first guide rail 11 and the second guide rail 12 in the form of insertion, and can slide and switch between the first guide rail 11 and the second guide rail 12, so that under the rotation of the double-drive linkage 1, the first switching linkage part 52 cooperates with different guide rails, so that when the first driving member 51 cooperates with the first guide rail 11, the cutter movement assembly 3 is not driven by the power mechanism (upper shaft 91), and when the first driving member 51 cooperates with the second guide rail 12, the cutter movement assembly 3 is driven by the power mechanism (upper shaft 91).

[0044] In addition, the embodiment further comprises a presser foot linkage assembly 6, which comprises a fifth driving member 61 in the shape of a long strip, provided with a second switching linkage part 62 in the form of a cylindrical groove, and the double-drive linkage 1 is provided with a protruding eccentric cylinder, so that the cylindrical groove and the cylinder cooperate to realize eccentric rotation of the second switching linkage part 62 on the double-drive linkage 1, so that under the rotation of the double-drive linkage 1, the second switching linkage part 62 is driven to eccentrically move, so as to drive the fifth driving member 61 to move and drive the presser foot linkage assembly 6 to lift and lower the presser foot base 41.

[0045] Therefore, only one double drive linkage 1 is needed to realize the switching of four states of the combination of whether the presser foot is lifted and whether the sewing thread is cut, and a single driver makes the adjustment operation more convenient and less likely to have an error state. Specifically, 1, when the state of lifting the presser foot and not cutting the sewing thread is needed, rotate the double drive linkage 1 to make the first switching linkage part 52 fit in the first guide rail 11, in this case, the cutter linkage assembly 5 controls the cutter movement assembly 3 to make the rotation of the upper shaft 91 not drive the movement of the cutter movement assembly 3, and the rotation of the double drive linkage 1 is performed without the first switching linkage part 52 being out of the first guide rail 11, to adjust and change the position of the second switching linkage part 62, at this position, the fifth driving part 61 moves to drive the presser foot linkage assembly 6 to lift the presser foot base 41 to a certain height, which is the positioning point of the state of lifting the presser foot and not cutting the sewing thread, 2, when the state of not lifting the presser foot and not cutting the sewing thread is needed, rotate the double drive linkage 1 to make the first switching linkage part 52 fit in the first guide rail 11, in this case, the cutter linkage assembly 5 controls the cutter movement assembly 3 to make the rotation of the upper shaft 91 not drive the movement of the cutter movement assembly 3, and the rotation of the double drive linkage 1 is performed without the first switching linkage part 52 being out of the first guide rail 11, to adjust and change the position of the second switching linkage part 62, at this position, the fifth driving part 61 does not move to drive the presser foot linkage assembly 6 to lift the presser foot base 41, which is the positioning point of the state of not lifting the presser foot and not cutting the sewing thread, 3, when the state of lifting the presser foot and cutting the sewing thread is needed, rotate the double drive linkage 1 to make the first switching linkage part 52 fit in the second guide rail 12, in this case, the cutter linkage assembly 5 controls the cutter movement assembly 3 to make the rotation of the upper shaft 91 drive the movement of the cutter movement assembly 3, and the rotation of the double drive linkage 1 is performed without the first switching linkage part 52 being out of the second guide rail 12, to adjust and change the position of the second switching linkage part 62, at this position, the fifth driving part 61 moves to drive the presser foot linkage assembly 6 to lift the presser foot base 41 to a certain height, which is the positioning point of the state of lifting the presser foot and cutting the sewing thread, 4, when the state of not lifting the presser foot and cutting the sewing thread is needed, rotate the double drive linkage 1 to make the first switching linkage part 52 fit in the second guide rail 12, in this case, the cutter linkage assembly 5 controls the cutter movement assembly 3 to make the rotation of the upper shaft 91 drive the movement of the cutter movement assembly 3, and the rotation of the double drive linkage 1 is performed without the first switching linkage part 52 being out of the second guide rail 12, to adjust and change the position of the second switching linkage part 62, at this position, the fifth driving part 61 does not move to drive the presser foot linkage assembly 6 to lift the presser foot base 41, which is the positioning point of the state of not lifting the presser foot and cutting the sewing thread.

[0046] Wherein, one end of the first guide rail 11 is communicated with one end of the second guide rail 12.

[0047] Preferably, the embodiment further comprises a switching motor (step motor, not shown in the figure), which is fixedly installed on the motor plate 93 (structure on the sewing machine) by means of bolts or the like. The output shaft of the switching motor is fixedly connected with the double-drive linkage 1 by means of key connection or the like, and is used to drive the double-drive linkage 1 to rotate.

[0048] Specifically, as shown in Figures 5-6 Specifically, as shown in

[0049] Specifically, as shown in Figure 7As shown, the presser foot movement assembly 4 in the embodiment further comprises a feeding fork 42, a first crank 43, a feeding swing shaft 44, a feeding rod sleeve 45, a feeding swing rod 46, a press rod 47, and a press rod holder 48. One end of the feeding fork 42 is locked and fixed to one end of the differential shaft 92 by means of bolts, and the other end clamps one end of the first crank 43, so that the first crank 43 can slide and rotate relative to the feeding fork 42. The other end of the first crank 43 is locked and fixed to one end of the feeding swing shaft 44 by means of bolts, and the axial direction of the feeding swing shaft 44 is parallel to the axial direction of the differential shaft 92. The other end of the feeding swing shaft 44 is inserted and fixed to one end of the feeding rod sleeve 45, and the axial direction of the feeding rod sleeve 45 extends vertically. In addition, the feeding swing rod 46 is inserted into the feeding rod sleeve 45 and extends downward out of the feeding rod sleeve 45. The feeding rod sleeve 45 is provided with a first hole 451 (extending vertically) along the axial direction of the differential shaft 92. The presser foot base 41 is provided with a second hole 411 (extending forward and backward) along the axial direction of the differential shaft 92. The feeding swing rod 46 is hinged with a sliding pin 461, and the sliding pin 461 is inserted into the first hole 451 and the second hole 411, and a square swing block 462 is arranged in the second hole 411. When the presser foot is in the lowered state, the sliding pin 461 abuts against the lowermost part of the first hole 451, so that the swing of the differential shaft 92 drives the feeding fork 42, the first crank 43, the feeding swing shaft 44, and the feeding rod sleeve 45 in turn, and drives the feeding swing rod 46 to move forward and backward while moving upward and downward (the downward movement of the sliding pin 461 is driven by the upward movement of the first hole 451, and the downward movement is caused by the gravity and the spring not disclosed, which can adopt the structure of the existing sewing machine). In this way, the presser foot base 41 moves upward and downward to lift and lower the presser foot. In addition, the press rod 47 is fixed to the upper part of the presser foot base 41 by clamping, and extends upward. The press rod holder 48 is fixed to the outer periphery of the press rod 47. In addition, the presser foot movement assembly 4 further comprises a pull rod assembly and a pressure adjusting assembly, which will not be disclosed further and can refer to the structure of the existing sewing machine.

[0050] Specifically, in combination with Figure 8As shown, the presser foot linkage assembly 6 in the embodiment includes a sixth driving member 63 and a seventh driving member 64, the seventh driving member 64 is vertically slotted and vertically slidingly arranged under the clamping of the protruding square lugs of the presser bar holder 48, and the sixth driving member 63 is hingedly connected to the right end of the fifth driving member 61 and the upper end of the seventh driving member 64 by using a hinge pin, so that the movement of the fifth driving member 61 drives the seventh driving member 64 to slide through the sixth driving member 63, the seventh driving member 64 slides upward to drive the presser bar holder 48 to move upward to drive the presser bar 41 upward, and the upward movement of the presser bar 41 drives the movable pin (the feeding swing lever) to move upward to the upper and lower middle part of the first hole 451, so that under the operation of the sewing machine, although the differential shaft 92 swings to drive the feeding lever sleeve 45 to move vertically, the vertical movement cannot drive the movable pin, so that the vertical position of the movable pin is fixed and the presser bar 41 cannot move up and down, keeping the stable lifting presser foot state.

[0051] Specifically, in combination with Figures 9-10 As shown, the cutter movement assembly 3 in the embodiment includes a first connecting member 32, a second connecting member 33 and a third connecting member 34, the length of the first connecting member 32 is provided with a first rotating shaft 96 (axially along the left and right directions) to realize the rotation of the first connecting member 32 after being assembled to the sewing machine, and the first connecting member 32 is rotationally installed, the first connecting member 32 is provided with a first connecting part 321 and a second connecting part 322, the first connecting part 321 is driven by the power mechanism; the second connecting member 33 is provided with a third connecting part 331 and a fourth connecting part 332, the third connecting part 331 and the second connecting part 322 are hingedly connected by using a hinge rod to link the first connecting member 32 and the second connecting member 33; the third connecting member 34 is provided with a fifth connecting part 341 and a sixth connecting part 342, a connecting shaft 35 is arranged between the fifth connecting part 341 and the fourth connecting part 332 to hinge the second connecting member 33 and the third connecting member 34, and the sixth connecting part 342 is hingedly connected to the cutter holder 31 to drive the cutter holder 31 to slide; when the first driving member 51 is fitted in the first guide rail 11, the connecting shaft 35 is driven to make its axis coaxial with the rotating axis of the first connecting member 32, and when the first driving member 51 is fitted in the second guide rail 12, the connecting shaft 35 is driven to make its axis non-coaxial with the rotating axis of the first connecting member 32.

[0052] Therefore, the first connecting part 321 is driven by the power mechanism to move, and always drives the first connecting part 32 and the second connecting part 33 to move, but 1, when the cutter seat 31 does not need to reciprocate to cut the sewing thread, the first driving part 51 is matched in the first guide rail 11 by adjusting the double-drive linkage 1, the position of the connecting shaft 35 is adjusted, so that the axis of the connecting shaft 35 is coaxial with the axis of the first rotating shaft 96, so that although the first connecting part 32 and the second connecting part 33 move, the axis of the connecting shaft 35 is coaxial with the axis of the first rotating shaft 96, which causes the fourth connecting part 332 to fail to transmit the bending moment to the fifth connecting part 341, so that the third connecting part 34 is always in a static state, and the cutter seat 31 does not move, 2, when the cutter seat 31 needs to reciprocate to cut the sewing thread, the first driving part 51 is matched in the second guide rail 12 by adjusting the double-drive linkage 1, the position of the connecting shaft 35 is adjusted, so that the axis of the connecting shaft 35 is non-coaxial with the axis of the first rotating shaft 96, so that the movement of the first connecting part 32 and the second connecting part 33 drives the third connecting part 34 to move, and the cutter seat 31 can be driven by the sixth connecting part 342 to reciprocate vertically.

[0053] The above structure cleverly adopts the clutch switching mode of whether the axis of the connecting shaft 35 is coaxial with the axis of the first rotating shaft 96, and the connecting shaft 35 stably connects the second connecting part 33 and the third connecting part 34 at all times, which guarantees the smoothness of switching and does not exist the wear condition.

[0054] Preferably, the first connecting part 321 and the second connecting part 322 in the embodiment are respectively arranged on the two sides of the radial direction of the first rotating shaft 96, so that the swinging direction of the first connecting part 321 will output in the reverse way of the second connecting part 322, so as to make the action more diverse, and the arrangement on the two sides will realize that the first connecting part 321 and the second connecting part 322 do not interfere with each other in the design of the transmission ratio.

[0055] Specifically, the cutter linkage assembly 5 in the embodiment comprises a second driving part 53, a third driving part 54 and a fourth driving part 55, wherein the third driving part 54 is rotatably installed in the mode of sleeving the differential shaft 92, in addition, the upper end of the second driving part 53 is hingedly connected to the first driving part 51 in the mode of ball hinge, and the lower end is hingedly connected to the third driving part 54 in the mode of hinged rod, the upper end of the fourth driving part 55 is hingedly connected to the third driving part 54 in the mode of hinged rod, and the lower end is hingedly connected to the connecting shaft 35, so that the swinging of the first driving part 51 drives the position adjustment of the connecting shaft 35 through the second driving part 53, the third driving part 54 and the fourth driving part 55 in turn.

[0056] Preferably, a tension spring 97 is arranged between the third driving member 54 and the fifth driving member 61 in the embodiment, so that the tension spring 97 is taut between the third driving member 54 and the fifth driving member 61, preventing the cutter linkage assembly 5 and the presser foot linkage assembly 6 from moving and making noise.

[0057] In addition, in combination with Figures 11-13 As shown in the drawings, the embodiment further comprises a power member 7 (power mechanism), which is provided with a seventh connecting portion 71 and an eighth connecting portion 72. The seventh connecting portion 71 is driven to swing by the upper shaft 91, and the eighth connecting portion 72 is connected with the first connecting portion 321 to drive the power mechanism to drive the first connecting member 32. Specifically, the eighth connecting portion 72 is provided in the form of a long slot, and the first connecting portion 321 is correspondingly provided with a square connecting block, so that the connecting block is arranged to slide in the long slot to realize the coupling between the eighth connecting portion 72 and the first connecting portion 321.

[0058] Therefore, the seventh connecting portion 71 is driven to realize the movement of the power member 7, and then the power member 7 drives the first connecting member 32 to move through the coupling between the eighth connecting portion 72 and the first connecting portion 321, and drives or does not drive the third connecting member 34 to move according to the position of the connecting shaft 35.

[0059] Specifically, the power member 7 is provided in the form of a circular hole at the seventh connecting portion 71, so that the eccentric seat 94 is hingedly installed, thereby driving the power member 7 to move under the rotation of the upper shaft 91.

[0060] Preferably, the first connecting member 32 and the second connecting member 33 in the embodiment are respectively arranged on the two sides of the power member 7 along the axial direction of the first rotating shaft 96, so as to reasonably utilize the space on the two sides of the power member 7, make the structure more compact, reduce the distance between the first connecting member 32 and the second connecting member 33, thereby reducing the bending moment and making the movement more smooth.

[0061] In addition, the embodiment further comprises a presser foot output member 81 and a sixth connecting member 82. The power member 7 is provided with a ninth connecting portion 73. The presser foot output member 81 is arranged to rotate around the sewing machine after being assembled. The sixth connecting member 82 is coupled with the ninth connecting portion 73 and the presser foot output member 81 in the form of a hinged rod. Therefore, the movement of the power member 7 drives the presser foot output member 81 to rotate and output through the sixth connecting member 82, so that the power member 7 is driven by the upper shaft 91 to realize double output.

[0062] In addition, the other end of the presser foot output member 81 in the embodiment is fixed with a presser foot crank 83 in the form of bolt locking, so that the presser foot crank 83 is linked to realize the function of reciprocating lifting and lowering of the differential teeth (not shown in the existing structure of the sewing machine).

[0063] Preferably, the seventh connecting part 71, the eighth connecting part 72 and the ninth connecting part 73 in the embodiment are arranged in sequence and downward.

[0064] Embodiment two:

[0065] A double-drive linkage structure for a sewing machine, which has the same main structure as that of Embodiment one, except that the two ends of the first guide rail 11 and the second guide rail 12 are respectively communicated.

[0066] Embodiment three:

[0067] A sewing machine, which comprises the double-drive linkage structure for a sewing machine according to any one of Embodiments one to two.

[0068] The above description of disclosed embodiments enables those skilled in the art to make or use the invention. Numerous modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be applied to other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A dual-drive linkage structure for a sewing machine, characterized in that, Include: Cutting knife movement assembly (3), the cutting knife movement assembly (3) includes cutting knife seat (31) provided with cutting knife, cutting knife seat (31) is slidingly arranged; Presser foot movement assembly (4), the presser foot movement assembly (4) includes presser foot seat (41) provided with presser foot, presser foot seat (41) is slidingly arranged; Double drive linkage (1), the double drive linkage (1) is rotationally mounted, the double drive linkage (1) is provided with first guide rail (11) and second guide rail (12) that are mutually communicated, the first guide rail (11) and the second guide rail (12) are arranged in the shape of arc coaxial with the rotation axis of the double drive linkage (1), and the first guide rail (11) and the second guide rail (12) are different in radius; Cutting knife linkage assembly (5), the cutting knife linkage assembly (5) includes first driving member (51), the first driving member (51) is provided with first switching linkage (52), and the first switching linkage (52) is matched with the first guide rail (11) or the second guide rail (12); and, Presser foot linkage assembly (6), the presser foot linkage assembly (6) includes fifth driving member (61), the fifth driving member (61) is provided with second switching linkage (62), and the second switching linkage (62) is eccentrically rotationally mounted on the double drive linkage (1); The first driving member (51) is matched with the first guide rail (11) so that the cutting knife movement assembly (3) is not driven by the power mechanism, and the first driving member (51) is matched with the second guide rail (12) so that the cutting knife movement assembly (3) is driven by the power mechanism; The double drive linkage (1) is rotated to drive the fifth driving member (61) to move and drive the presser foot linkage assembly (6) to lift the presser foot seat (41); The cutter motion assembly (3) comprises a first connecting member (32), a second connecting member (33) and a third connecting member (34). The first connecting member (32) is rotatably installed and provided with a first connecting portion (321) and a second connecting portion (322). The first connecting portion (321) is used to be driven by a power mechanism. The second connecting member (33) is provided with a third connecting portion (331) and a fourth connecting portion (332). The third connecting portion (331) is connected with the second connecting portion (322) to link the first connecting member (32) and the second connecting member (33). The third connecting member (34) is provided with a fifth connecting portion (341) and a sixth connecting portion (342). A connecting shaft (35) is arranged between the fifth connecting portion (341) and the fourth connecting portion (332) to hinge the second connecting member (33) and the third connecting member (34). The sixth connecting portion (342) is hinged to the cutter seat (31) to link and drive the cutter seat (31) to slide. When the first driving member (51) is matched in the first guide rail (11), the connecting shaft (35) is driven to arrange its axis coaxially with the rotation axis of the first connecting member (32). When the first driving member (51) is matched in the second guide rail (12), the connecting shaft (35) is driven to arrange its axis non-coaxially with the rotation axis of the first connecting member (32).

2. The double drive linkage structure for a sewing machine according to claim 1, characterized in that: The power mechanism comprises a power member (7) provided with a seventh connecting portion (71) and an eighth connecting portion (72). The seventh connecting portion (71) is driven to act. The eighth connecting portion (72) is connected with the first connecting portion (321) to drive the power mechanism to drive the first connecting member (32).

3. The double drive linkage structure for a sewing machine according to claim 2, characterized in that: The power member (7) is provided with an eccentric seat (94) at the seventh connecting portion (71). The eccentric seat (94) is provided with an eccentric hole (95) used to be connected with an upper shaft (91) to rotate the upper shaft (91) to eccentrically drive the power member (7) to move.

4. The double drive linkage structure for a sewing machine according to claim 3, characterized in that: The sewing needle motion assembly (2) comprises a sewing needle seat (21) provided with a sewing needle, a fourth connecting member (22) and a fifth connecting member (23). The sewing needle seat (21) is slidably arranged. The fourth connecting member (22) is eccentrically and rotatably installed in the eccentric seat (94). The fifth connecting member (23) is hinged to the sewing needle seat (21) and the fourth connecting member (22) to drive the sewing needle seat (21) to reciprocate by the rotation of the eccentric seat (94) through the fourth connecting member (22) and the fifth connecting member (23) in sequence.

5. The double drive linkage structure for a sewing machine according to claim 1, characterized in that: The cutter linkage assembly (5) comprises a second driving member (53), a third driving member (54) and a fourth driving member (55), the first driving member (51) and the third driving member (54) are both rotationally installed, the second driving member (53) is hingedly connected with the first driving member (51) and the third driving member (54) respectively, and the fourth driving member (55) is hingedly connected with the third driving member (54) and the connecting shaft (35) respectively, so that the swing of the first driving member (51) drives the position adjustment of the connecting shaft (35) through the second driving member (53), the third driving member (54) and the fourth driving member (55) in sequence.

6. The double drive linkage structure for a sewing machine according to claim 5, characterized in that: A tension spring (97) is arranged between the third driving member (54) and the fifth driving member (61).

7. The double drive linkage structure for a sewing machine according to claim 1, characterized in that: The presser foot linkage assembly (6) comprises a sixth driving member (63) and a seventh driving member (64), the seventh driving member (64) is arranged to slide in the same direction as the sliding direction of the presser foot base (41), the sixth driving member (63) is hingedly connected with the fifth driving member (61) and the seventh driving member (64) respectively, so that the movement of the fifth driving member (61) drives the seventh driving member (64) to slide through the sixth driving member (63); The seventh driving member (64) slides to control the sliding of the presser foot base (41).

8. The double drive linkage structure for a sewing machine according to any one of claims 1 to 7, characterized in that: The double-drive linkage structure comprises a switching motor, and the switching motor is used to drive the double-drive linkage (1) to rotate.

9. A sewing machine characterized by: The double-drive linkage structure is used for a sewing machine. The double-drive linkage structure is used for a sewing machine.

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