CN220413709U - Needle feeding switching and presser foot driving mechanism of sewing machine - Google Patents

Abstract

The utility model provides a needle feeding switching and presser foot driving mechanism of a sewing machine, which comprises a tooth frame, a feeding tooth, a needle bar, a machine needle, a presser foot lifting mechanism, a tooth lifting mechanism, a feeding mechanism, a main shaft, a main motor, a needle swing adjusting driving source, a needle feeding adjusting switching unit, a presser foot lifting transmission unit, and a needling mechanism and a needle swing mechanism which are all connected between the main shaft and the needle bar, wherein the main motor, the tooth lifting driving source, the feeding driving source and the needle swing adjusting driving source are four independent driving sources, the needle swing mechanism comprises a needle swing seat, the position angle of the needle swing seat determines the transmission efficiency of the needle swing mechanism, the needle swing adjusting driving source is in transmission connection with the needle swing seat through the needle feeding adjusting switching unit, and the needle swing adjusting driving source is connected with the presser foot lifting mechanism through the presser foot lifting transmission unit. The needle swing adjusting driving source is also used for lifting the presser foot driving, the functions are increased, and the competitiveness of products is improved.

Description

Needle feeding switching and presser foot driving mechanism of sewing machine

Technical Field

The utility model relates to the technical field of sewing machines, in particular to a needle feeding switching and presser foot driving mechanism of a sewing machine.

Background

At present, sewing machines include a common feeding sewing machine and a needle feeding sewing machine according to different feeding modes. The common feeding sewing machine only feeds by feeding teeth, and the needle only pierces cloth. The needle feeding sewing machine is fed by the needle and the feeding teeth together, namely, the needle is moved forward while needling cloth, and needle feeding is carried out. The needle feeding sewing machine has great improvement effect on the aspect of staggered layers of cloth, and is widely applied to sewing of high-end clothes. However, the common feeding sewing machine and the needle feeding sewing machine are both special types, the common feeding sewing machine is difficult to adapt to the sewing working conditions of some needle feeding sewing machines, and the needle feeding sewing machine is difficult to adapt to the sewing working conditions of some common machines, so that the respective technical limitations are relatively large, the cloth feeding mode of the same sewing machine is single, the common feeding sewing machine cannot be compatible, and the use scene of the sewing machine is limited.

In addition, in some common feeding sewing machines, the power of the feeding cloth and the lifting teeth is derived from the main shaft, so that the initial phase angles of the feeding cloth and the lifting teeth are determined relative to the phase angle of the main shaft, and cannot be adjusted, the sewing requirements with different feeding moment requirements cannot be met, and the use scene of the sewing machine is limited.

Disclosure of Invention

In view of the above-mentioned drawbacks of the prior art, the present utility model is to provide a needle feeding switching and presser foot driving mechanism for a sewing machine, which has both normal feeding and needle feeding functions, and implements needle feeding switching and presser foot lifting driving by using the same driving source.

In order to achieve the above-mentioned purpose, the present utility model provides a needle feeding switching and presser foot driving mechanism of a sewing machine, including a feed gear rack, a needle bar, a needle, a presser foot lifting mechanism, a feed gear rack, a main shaft, a main motor, a needle swing adjusting driving source, a needle feed adjusting switching unit, a presser foot lifting driving unit, a needling mechanism and a needle swing mechanism, wherein the feed gear rack is installed on the feed gear rack, the needle bar, the feed gear rack, the needle lifting mechanism, the presser foot lifting mechanism, the needle swing driving source, the needle swing mechanism, the needle swing driving source and the needle swing adjusting driving source are four independent driving sources, the needle swing mechanism comprises a needle swing seat with a fixed swing fulcrum, the position angle of the needle swing seat determines the transmission efficiency of the needle swing mechanism, and the needle swing adjusting driving source is connected with the needle swing seat through the needle feed adjusting switching unit;

The operating range of the needle swing adjusting driving source comprises a needle swing adjusting interval and a presser foot lifting interval which are mutually independent, wherein the needle swing adjusting interval comprises a zero needle distance feeding position; when the needle swing adjusting driving source is positioned at a zero needle distance position, the needle bar is positioned in a vertical state, and the transmission efficiency of the needle swing mechanism is zero.

Further, the needle swing adjusting driving source is a motor, the needle delivery adjusting switching unit comprises a needle swing adjusting cam, a needle swing adjusting crank with a fixed rotating fulcrum, a needle swing adjusting ball rotatably arranged at one end of the needle swing adjusting crank, and a needle swing adjusting connecting rod, the needle swing adjusting cam is fixed on a motor shaft of the needle swing adjusting driving source and can be in contact fit with the needle swing adjusting ball, and two ends of the needle swing adjusting connecting rod are hinged with the other end of the needle swing adjusting crank and the needle swing swinging seat respectively.

Preferably, when the needle swing adjusting driving source operates in a needle swing adjusting section, the needle swing adjusting ball is in contact fit with a reducing surface on the periphery of the needle swing adjusting cam;

when the needle swing adjusting driving source operates in the presser foot lifting interval, the needle swing adjusting ball is in contact fit with the constant diameter surface on the periphery of the needle swing adjusting cam, or the needle swing adjusting ball is separated from the needle swing adjusting cam.

Further, the needle pendulum adjusting driving source is a motor, the presser foot lifting driving unit comprises a presser foot lifting driving cam, a presser foot lifting driving crank with a fixed rotating fulcrum, a presser foot lifting driving ball rotatably arranged at one end of the presser foot lifting driving crank, and a presser foot lifting driving push rod, the presser foot lifting driving cam is fixed on a motor shaft of the needle pendulum adjusting driving source and can be in contact fit with the presser foot lifting driving ball, one end of the presser foot lifting driving push rod is hinged with the other end of the presser foot lifting driving crank, and the other end of the presser foot lifting driving push rod is connected with the presser foot lifting mechanism.

Preferably, when the needle swing adjusting driving source runs in the presser foot lifting section, the presser foot lifting transmission ball is in contact fit with a reducing surface on the periphery of the presser foot lifting transmission cam;

when the needle swing adjusting driving source runs in the needle swing adjusting section, the presser foot lifting transmission ball is in contact fit with the constant diameter surface on the periphery of the presser foot lifting transmission cam, or the presser foot lifting transmission ball is separated from the presser foot lifting transmission cam.

Further, the needle swing mechanism further comprises a needle swing transmission shaft rotatably supported in the sewing machine shell, a first needle swing transmission unit in transmission connection between the main shaft and the needle swing transmission shaft, and a second needle swing transmission unit in transmission connection between the needle swing transmission shaft and the needle bar, wherein the needle swing transmission shaft is parallel to the main shaft, and the needle swing seat is a component in the first needle swing transmission unit.

Further, the first needle swing transmission unit comprises a needle swing eccentric wheel fixed on the main shaft, a first needle swing connecting rod, a first needle swing rod, a second needle swing rod, a crank rotating shaft rotatably supported in the bottom plate of the sewing machine and parallel to the needle swing transmission shaft, a first needle swing crank fixed on the crank rotating shaft, a second needle swing connecting rod and a second needle swing crank fixed at one end of the needle swing transmission shaft, one end of the first needle swing connecting rod is in rotary fit with the needle swing eccentric wheel, the other end of the first needle swing connecting rod, one end of the first needle swing rod and one end of the second needle swing rod are coaxially hinged, the other end of the first needle swing rod is hinged with the first needle swing crank, the other end of the second needle swing rod is hinged with the needle swing seat, and two ends of the second needle swing connecting rod are respectively hinged with the first needle swing crank and the second needle swing crank.

Further, the second needle swing transmission unit comprises a third needle swing crank, a third needle swing connecting rod, a needle swing guide rail, a needle swing shaft rotatably supported in the sewing machine shell and a needle bar support, wherein the third needle swing crank, the third needle swing connecting rod, the needle swing guide rail and the needle bar support are fixed at the other end of the needle swing transmission shaft, two ends of the third needle swing connecting rod are hinged with the third needle swing crank and the needle swing guide rail respectively, the needle swing guide rail and the needle bar support are fixed on the needle swing shaft, and the needle bar is installed in the needle bar support in a vertically movable mode.

Further, the cloth needling mechanism comprises a needle bar crank fixed on a main shaft, a thread taking-up crank, a needle bar connecting rod, a needle bar sliding block and a needle bar connecting column, wherein one end of the needle bar connecting column is fixed on the needle bar, the thread taking-up crank comprises a first shaft part and a second shaft part which are eccentrically arranged, the first shaft part is eccentric to the main shaft and is fixed in the needle bar crank, two ends of the needle bar connecting rod are respectively in rotary fit with the second shaft part and the needle bar connecting column, the needle bar sliding block is rotatably sleeved on the periphery of the needle bar connecting column, a sliding groove parallel to the needle bar is formed in the needle swing guide rail, and the needle bar sliding block is slidably arranged in the sliding groove of the needle swing guide rail.

Further, the lifting tooth driving source is a motor, the lifting tooth mechanism further comprises a first lifting tooth crank, a first lifting tooth connecting rod, a lifting tooth shaft rotatably supported in the bottom plate of the sewing machine and parallel to the main shaft, a second lifting tooth crank, a third lifting tooth crank and a second lifting tooth connecting rod, wherein the second lifting tooth crank and the third lifting tooth crank are respectively fixed at two ends of the lifting tooth shaft, the first lifting tooth crank is fixed on a motor shaft of the lifting tooth driving source, two ends of the first lifting tooth connecting rod are respectively hinged with the first lifting tooth crank and the second lifting tooth crank, and two ends of the second lifting tooth connecting rod are respectively hinged with the third lifting tooth crank and the tooth frame.

Further, the feeding driving source is a motor, the feeding mechanism further comprises a first feeding crank, a feeding connecting rod, a feeding shaft which is rotatably supported in the bottom plate of the sewing machine and parallel to the main shaft, and a second feeding crank and a dental frame seat which are respectively fixed at two ends of the feeding shaft, the first feeding crank is fixed on a motor shaft of the feeding driving source, two ends of the feeding connecting rod are respectively hinged with the first feeding crank and the second feeding crank, and the dental frame seat is connected with a dental frame.

As described above, the needle feeding switching and presser foot driving mechanism of the sewing machine according to the present utility model has the following advantages:

in the method, the main motor, the lifting tooth driving source and the feeding driving source are mutually independent, so that the phase angles of initial phase angles of the feeding cloth and the lifting tooth relative to the main shaft are adjustable; meanwhile, the output of the needle swing adjusting driving source determines the transmission efficiency of the needle swing mechanism, and the transmission efficiency of the needle swing mechanism can be zero. Thus, the output of the needle swing adjusting driving source is controlled to ensure that the transmission efficiency of the needle swing mechanism is not zero, the main shaft drives the needle rod and the needle to swing back and forth through the needle swing mechanism, and the needle and the feeding teeth jointly feed, so that the sewing machine is in a needle feeding mode; the output of the needle swing adjusting driving source is controlled to enable the transmission efficiency of the needle swing mechanism to be zero, the main shaft can not drive the needle rod and the needle to swing back and forth through the needle swing mechanism, the needle is not fed, and the feeding teeth only feed the needle, so that the sewing machine is in a common feeding mode. Therefore, the sewing machine has the functions of common feeding and needle feeding, can be conveniently switched between the functions of common feeding and needle feeding, expands the use scene of the sewing machine, and can be suitable for different sewing working conditions. In addition, the needle swing adjusting driving source is also used for driving the presser foot, so that the presser foot is lifted, the function is increased, the cost is relatively reduced, and the competitiveness of the product is improved.

Drawings

Fig. 1 is a schematic view of the needle feed switching and presser foot driving mechanism of the sewing machine of the present application.

Fig. 2 is a schematic diagram of the connection between the presser foot lifting mechanism, the needle feeding adjustment switching unit, the presser foot lifting transmission unit, the needle swing mechanism and the cloth needling mechanism in fig. 1.

Fig. 3 is a schematic view of the right section of fig. 2.

Fig. 4 is a schematic diagram of the connection among the presser foot lifting mechanism, the needle feeding adjustment switching unit and the presser foot lifting transmission unit in the present application.

Fig. 5 is a schematic structural view of the needling mechanism and the second needle swing transmission unit in the present application.

Fig. 6 is an exploded view of the needle bar crank, the take-up crank and the needle bar link of fig. 5.

Fig. 7 is a schematic structural view of a feed mechanism and a feed mechanism in the present application.

Description of element reference numerals

101. Tooth rack

102. Feeding tooth

103. Needle bar

104. Machine needle

20. Presser foot lifting mechanism

21. Right lever

22. Presser foot lifting pull rod

23. Left lever

24. Presser foot lifting plate

25. Compression bar guide block

26. Presser foot bar

30. Tooth lifting mechanism

31. Lifting tooth driving source

32. First lifting tooth crank

33. First lifting tooth connecting rod

34. Lifting shaft

35. Second lifting crank

36. Third lifting tooth crank

37. Second lifting tooth connecting rod

40. Feeding mechanism

41. Feeding driving source

42. First feeding crank

43. Feeding connecting rod

44. Feeding shaft

45. Second feeding crank

46. Dental frame base

50. Needle feeding adjusting and switching unit

51. Needle swing adjusting cam

52. Needle swing adjusting crank

53. Needle swing adjusting ball

54. Needle swing adjusting connecting rod

60. Foot-lifting transmission unit

61. Presser foot lifting transmission cam

62. Presser foot lifting transmission crank

63. Foot lifting transmission ball

64. Presser foot lifting transmission ejector rod

70. Cloth needling mechanism

71. Needle bar crank

72. Thread take-up crank

721. A first shaft part

722. Second shaft portion

73. Needle bar connecting rod

74. Needle bar sliding block

75. Needle bar connecting column

80. Needle swing mechanism

81. Needle swing seat

82. Needle swing transmission shaft

83. Needle swing eccentric wheel

84. First needle swing connecting rod

85. First needle swing rod

86. Second needle swing rod

87. Crank shaft

88. First needle swing crank

881. Right crank arm

882. Left crank arm

89. Second needle swing connecting rod

810. Second needle swing crank

811. Third needle swing crank

812. Third needle swing connecting rod

813. Needle swing guide rail

814. Needle pendulum shaft

815. Needle bar support

816. Sliding chute

817. Supporting pin

90. Main shaft

110. Main motor

120. Needle swing adjusting driving source

130. Thread take-up lever

Detailed Description

Further advantages and effects of the present utility model will become apparent to those skilled in the art from the disclosure of the present utility model, which is described by the following specific examples.

It should be understood that the structures, proportions, sizes, etc. shown in the drawings are for illustration purposes only and should not be construed as limiting the utility model to the extent that it can be practiced, since modifications, changes in the proportions, or adjustments of the sizes, which are otherwise, used in the practice of the utility model, are included in the spirit and scope of the utility model which is otherwise, without departing from the spirit or scope thereof. Also, the terms such as "upper", "lower", "left", "right", "middle", etc. are used herein for convenience of description, but are not to be construed as limiting the scope of the utility model, and the relative changes or modifications are not to be construed as essential to the scope of the utility model.

It will also be understood that when an element is referred to as being "mounted" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or be indirectly connected to the other element through intervening elements.

Furthermore, the descriptions of "first," "second," and the like, herein are for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be regarded as not exist and not within the protection scope of the present application.

The application relates to the technical field of sewing machines, in particular to a needle feeding switching and presser foot driving mechanism of a sewing machine. As shown in fig. 1, the sewing machine has a main shaft 90 rotatably supported in a sewing machine housing. For convenience of description, in the following embodiments, the following directions are defined as follows: the axial direction of the main shaft 90 in the sewing machine is defined as a left-right direction, the direction of the main shaft 90 facing the machine head is a left direction, and the direction of the main shaft 90 facing the machine tail is a right direction; defining the feeding direction of the sewing machine as the front-back direction, and the feeding direction during normal sewing as the front direction; a direction orthogonal to both the left-right direction and the front-rear direction is defined as an up-down direction.

As shown in fig. 1, the needle feeding switching and presser foot driving mechanism of the sewing machine according to the present application comprises a frame 101, a feeding tooth 102 mounted on the frame 101, a needle bar 103, a needle 104 mounted at the lower end of the needle bar 103, a presser foot lifting mechanism 20 connected with the presser foot, a feed mechanism 40 connected with the front end of the frame 101, a main shaft 90, a main motor 110 connected to the right end of the main shaft 90, a needle swing adjusting driving source 120, a needle feeding adjusting switching unit 50, a presser foot lifting driving unit 60, and a needling mechanism 70 and a needle swing mechanism 80 both connected between the main shaft 90 and the needle bar 103, wherein the main motor 110 drives the main shaft 90 to rotate, and the main motor 110 also forms a needling driving source and a needle swing driving source. The feed lifting mechanism 30 is provided with a feed lifting driving source 31, the feed mechanism 40 is provided with a feed driving source 41, the main motor 110, the feed lifting driving source 31, the feed driving source 41 and the needle swing adjusting driving source 120 are four independent driving sources, and the main motor 110, the feed lifting driving source 31, the feed driving source 41 and the needle swing adjusting driving source 120 are all in communication connection with an electronic control module of the sewing machine.

In particular, as shown in fig. 1, the needle swing mechanism 80 includes a needle swing seat 81 having a fixed swing fulcrum, and the position angle of the needle swing seat 81 determines the transmission efficiency of the needle swing mechanism 80; the needle swing adjusting driving source 120 is in transmission connection with the needle swing seat 81 through the needle delivery adjusting switching unit 50 and is used for changing the position angle of the needle swing seat 81; the needle swing adjusting drive source 120 is connected to the presser foot lifting mechanism 20 through the presser foot lifting transmission unit 60. The operation range of the needle swing adjusting driving source 120 comprises a needle swing adjusting section and a presser foot lifting section which are mutually independent, wherein the needle swing adjusting section comprises a zero needle pitch position; when the needle swing adjusting drive source 120 is at the zero needle pitch position, the needle bar 103 is in the vertical state, and the transmission efficiency of the needle swing mechanism 80 is zero. During the sewing process, the needle swing adjusting driving source 120 outputs the numerical value in the needle swing adjusting section and keeps the numerical value still, so that the needle feed adjusting and switching unit 50 and the presser foot lifting transmission unit 60 are both stationary.

In the needle feeding switching and presser foot driving mechanism, since the main motor 110, the feed lifting driving source 31 and the feed driving source 41 are mutually independent, the operation time sequence of the feed lifting driving source 31 and the feed driving source 41 relative to the main motor 110 is adjustable, and the phase angles of the initial phase angles of the feed feeding and the feed lifting are adjustable relative to the main shaft 90. By controlling the output of the needle swing adjusting drive source 120, the transmission efficiency of the needle swing mechanism 80 and the lifting drive of the presser foot can be controlled, and in combination with the phase control among the main motor 110, the feed lifting drive source 31 and the feed drive source 41, the sewing machine can be operated in the normal feed mode or the sewing machine can be operated in the needle feed mode, as described below.

When the electronic control module controls the needle swing adjusting driving source 120 to be at the zero needle distance position in the needle swing adjusting interval, the transmission efficiency of the needle swing mechanism 80 is zero, the sewing machine is in the normal feeding mode, and the electronic control module controls the feed lifting driving source 31, the feed driving source 41 and the main motor 110 to operate according to the operation parameters in the normal feeding mode. When the sewing machine is used for sewing, the feed lifting mechanism 30 drives the feed rack 101 and the feed dog 102 to reciprocate up and down, so that the feed dog 102 executes the feed lifting action; the feeding mechanism 40 drives the tooth frame 101 and the feeding tooth 102 to reciprocate back and forth, so that the feeding tooth 102 executes cloth feeding action; the main motor 110 drives the main shaft 90 to rotate, and the main shaft 90 drives the needle bar 103 and the needle 104 to reciprocate up and down through the cloth needling mechanism 70, so that the needle 104 performs cloth needling action; however, since the transmission efficiency of the needle swing mechanism 80 is zero, the spindle 90 does not swing back and forth by the needle swing mechanism 80 to drive the needle bar 103 and the needle 104. Therefore, when the sewing machine is used for sewing in the normal feeding mode, the needle 104 only reciprocates up and down, the feeding teeth 102 do the compound motion of up and down reciprocating motion and back and forth reciprocating motion, the feeding teeth 102 only feed materials, and the feeding teeth 102 have tooth feeding pitches; further, by controlling the phase difference between the lift-feed drive source 31, the feed drive source 41, and the main motor 110, the following motion relationship is provided between the needle 104 and the feed dog 102: the needle 104 moves downwards from the highest point, and the feeding tooth 102 also moves downwards; after that, when the needle 104 is just about to pierce the needle plate, the feeding tooth 102 just moves down to a position flush with the needle plate; then, the needle 104 moves downwards to the lowest point, and the feeding tooth 102 also moves downwards to the lowest point, so that the feeding tooth 102 moves below the needle plate when the needle 104 is used for needling cloth, and the feeding tooth 102 cannot feed; finally, the needle 104 moves up from the lowest point and the feed dog 102 also moves up. Namely: in the normal feeding mode, when the needle 104 is above the needle plate, the feeding teeth 102 emerge from the needle plate; the feed dog 102 is submerged under the needle plate as the needle 104 pierces the underside of the needle plate. In addition, since the feeding drive source 41 is an independent drive source, the size of the tooth feed pitch of the feed dog 102 can be adjusted by controlling the output of the feeding drive source 41. When the presser foot needs to be lifted, the electric control module controls the needle swing adjusting driving source 120 to operate in the presser foot lifting interval, and the needle swing adjusting driving source 120 drives the presser foot lifting mechanism 20 to act through the presser foot lifting transmission unit 60 so as to drive the presser foot to move upwards, thereby realizing automatic presser foot lifting.

When the electric control module controls the needle swing adjusting driving source 120 to be positioned at a non-zero needle feeding distance position in a needle swing adjusting interval, the transmission efficiency of the needle swing mechanism 80 is not zero, the sewing machine is in a needle feeding mode, and the electric control module controls the lifting tooth driving source 31, the feeding driving source 41 and the main motor 110 to operate according to operation parameters in the needle feeding mode; the output of the needle swing adjustment drive source 120 matches the set needle pitch, and the needle swing adjustment drive source 120 maintains the output, that is, the needle swing seat 81 is maintained at the current position angle and in a stationary state. When the sewing machine is used for sewing, the feed lifting mechanism 30 drives the feed rack 101 and the feed dog 102 to reciprocate up and down, so that the feed dog 102 executes the feed lifting action; the feeding mechanism 40 drives the tooth frame 101 and the feeding tooth 102 to reciprocate back and forth, so that the feeding tooth 102 executes cloth feeding action; the main motor 110 drives the main shaft 90 to rotate, on the one hand, the main shaft 90 drives the needle bar 103 and the needle 104 to reciprocate up and down through the cloth needling mechanism 70 to enable the needle 104 to perform cloth needling action, and on the other hand, the main shaft 90 drives the needle bar 103 and the needle 104 to swing back and forth through the needle swinging mechanism 80 to enable the needle 104 to perform cloth feeding action. Therefore, when the sewing machine is in the needle feeding mode for sewing, the needle 104 performs the compound motion of up-and-down reciprocating movement and back-and-forth swinging, and the needle 104 has a needle feeding distance; meanwhile, the feeding teeth 102 do compound motion of up-and-down reciprocating motion and back-and-forth reciprocating motion, and the feeding teeth 102 have tooth needle feeding distances; the needle feeding distance of the needle 104 is consistent with the tooth feeding distance of the feeding tooth 102, namely, the feeding amount of the needle 104 is consistent with the feeding amount of the feeding tooth 102. Further, by controlling the phase difference between the lift-feed drive source 31, the feed drive source 41, and the main motor 110, the following motion relationship is provided between the needle 104 and the feed dog 102: the needle 104 moves downwards from the highest point, and the feeding tooth 102 moves upwards from the lowest point; after that, when the needle 104 is about to pierce the needle plate, the feeding tooth 102 is just moved upwards to a position flush with the needle plate; then, the machine needle 104 moves downwards and then upwards to pierce the cloth, and the feeding tooth 102 moves upwards and then downwards, namely, the machine needle 104 moves upwards to feed when piercing the cloth; finally, the needle 104 continues to move up to the highest point and the feed dog 102 continues to move down to the lowest point. Namely: in the needle feeding mode, when the needle 104 is above the needle plate, the feeding teeth 102 sink below the needle plate; when the needle 104 pierces the underside of the needle plate, the feed tooth 102 emerges from the needle plate exactly opposite to that in the normal feed mode. In addition, since the feeding driving source 41 and the needle swing adjusting driving source 120 are independent driving sources, the size of the tooth feeding pitch of the feeding tooth 102 can be adjusted by controlling the output of the feeding driving source 41, and the transmission efficiency of the needle swing mechanism 80, that is, the needle feeding pitch of the needle 104 can be adjusted by controlling the output of the needle swing adjusting driving source 120. When the presser foot needs to be lifted, the electric control module controls the needle swing adjusting driving source 120 to operate in the presser foot lifting interval, and the needle swing adjusting driving source 120 drives the presser foot lifting mechanism 20 to act through the presser foot lifting transmission unit 60 so as to drive the presser foot to move upwards, thereby realizing automatic presser foot lifting.

Therefore, the sewing machine has the functions of common feeding and needle feeding, can be conveniently switched between the functions of common feeding and needle feeding, expands the use scene of the sewing machine, can be suitable for different sewing working conditions, greatly enhances the adaptability of the machine to different fabrics and working conditions, has multiple purposes, simplifies the adjustment operation, improves the working efficiency and improves the competitiveness of products. In addition, the needle swing adjusting driving source 120 is also used for driving the presser foot, so that the presser foot is lifted, the function is increased, the cost is relatively reduced, and the competitiveness of the product is further improved.

Further, the needle feeding switching and presser foot driving mechanism further comprises a switching button arranged on the sewing machine shell, the switching button is in communication connection with the electronic control module, and an instruction for switching the feeding mode of the sewing machine is input by pressing the switching button, so that the aim of switching the sewing mode by one key is fulfilled, and the switching operation is simplified.

Preferably, as shown in fig. 3, the needle swing seat 81 has a substantially concave structure, and support pins 817 extending from left to right are fixed to both left and right sides thereof, and the support pins 817 are rotatably supported in the sewing machine base plate, so that the needle swing seat 81 is rotatably supported in the sewing machine base plate, and the support pins 817 constitute a fixed swing fulcrum of the needle swing seat 81.

Further, as shown in fig. 2 to 4, the needle swing adjusting drive source 120 is a motor, preferably a stepping motor, and the needle swing adjusting drive source 120 is fixed to the sewing machine housing. The needle feeding adjustment switching unit 50 has a preferable structure: the needle feeding adjustment switching unit 50 includes a needle swing adjustment cam 51, a needle swing adjustment crank 52 having a fixed pivot, a needle swing adjustment ball 53 rotatably mounted at the rear end of the needle swing adjustment crank 52, and a needle swing adjustment link 54, the needle swing adjustment cam 51 being fixed on a motor shaft of the needle swing adjustment driving source 120 and being capable of contact-fit with the needle swing adjustment ball 53, the lower end of the needle swing adjustment link 54 being hinged to the front end of the needle swing adjustment crank 52, the upper end of the needle swing adjustment link 54 being hinged to the right side surface of the needle swing seat 81.

Further, the presser foot lifting mechanism 20 is preferably configured as follows: as shown in fig. 4, the presser foot lifting mechanism 20 includes a right lever 21 having a fixed pivot, a presser foot lifting lever 22, a left lever 23 having a fixed pivot, a presser foot lifting plate 24, a presser foot guide 25, and a presser foot bar 26 mounted in the sewing machine housing so as to be movable up and down, the right and left ends of the presser foot lifting lever 22 are hinged to the right and left levers 21 and 23, respectively, the left lever 23 and the presser foot lifting plate 24 are hinged, a lifting hook portion is provided on the presser foot lifting plate 24, a connection protrusion portion engaged with the lifting hook portion is provided on the presser foot guide 25, the presser foot guide 25 is fastened to the presser foot bar 26 by a screw, and the presser foot guide 25 is near the upper end of the presser foot bar 26, and the presser foot is mounted at the lower end of the presser foot bar 26.

Further, the structure of the presser foot lifting transmission unit 60 is preferably: as shown in fig. 2 to 4, the presser foot lifting transmission unit 60 includes a presser foot lifting transmission cam 61, a presser foot lifting transmission crank 62 having a fixed rotation fulcrum, a presser foot lifting transmission ball 63 rotatably mounted at the rear end of the presser foot lifting transmission crank 62, and a presser foot lifting transmission jack 64, the presser foot lifting transmission cam 61 is fixed on the motor shaft of the needle swing adjusting drive source 120 and can be in contact fit with the presser foot lifting transmission ball 63, the presser foot lifting transmission cam 61 is distributed on the left side of the needle swing adjusting cam 51, the lower end of the presser foot lifting transmission jack 64 is hinged with the front end of the presser foot lifting transmission crank 62, and the upper end of the presser foot lifting transmission jack 64 is hinged with the right lever 21 in the presser foot lifting mechanism 20.

When the feeding mode of the sewing machine needs to be switched and the needle feeding distance of the needle 104 needs to be adjusted, the electronic control module controls the needle swing adjusting driving source 120 to operate in the needle swing adjusting interval and rotate by a corresponding angle. In this process, the needle swing adjusting ball 53 is in contact fit with the reducing surface on the outer periphery of the needle swing adjusting cam 51, so that the needle swing adjusting cam 51 drives the needle swing adjusting crank 52 to rotate around the fixed rotation pivot through the needle swing adjusting ball 53, drives the needle swing seat 81 to rotate around the supporting pin 817 through the needle swing adjusting connecting rod 54, changes the position angle of the needle swing seat 81, and also changes the transmission efficiency of the needle swing mechanism 80, and the purposes of adjusting the needle feeding distance of the machine needle 104 and enabling the needle feeding distance of the machine needle 104 to be zero are achieved by combining the phase adjustment of the lifting tooth driving source 31 and the feeding driving source 41. Meanwhile, the presser foot lifting transmission ball 63 is in contact fit with the constant diameter surface on the periphery of the presser foot lifting transmission cam 61, or the presser foot lifting transmission ball 63 is separated from the presser foot lifting transmission cam 61, even if the presser foot lifting transmission cam 61 is driven to rotate by the needle pendulum adjusting driving source 120, the presser foot lifting transmission crank 62 is not driven to rotate by the presser foot lifting transmission ball 63, the presser foot lifting transmission crank 62 and the presser foot lifting transmission push rod 64 are kept still, the presser foot lifting mechanism 20 is not operated, and the presser foot lifting mechanism 20 is not operated when the sewing mode is switched and when the needle feeding distance of the needle 104 is adjusted.

When the presser foot needs to be lifted, the electronic control module controls the needle swing adjusting driving source 120 to operate in the presser foot lifting interval and rotate by a corresponding angle. In the process, the needle swing adjusting ball 53 is in contact fit with the constant diameter surface of the outer periphery of the needle swing adjusting cam 51, or the needle swing adjusting ball 53 is separated from the needle swing adjusting cam 51, even if the needle swing adjusting cam 51 is driven to rotate by the needle swing adjusting driving source 120, the needle swing adjusting crank 52 cannot be driven to rotate by the needle swing adjusting ball 53, namely, the needle swing adjusting crank 52 and the needle swing adjusting connecting rod 54 are kept motionless, and the aim of keeping the position angle of the needle swing seat 81 unchanged in the process of lifting the presser foot is achieved. Meanwhile, the presser foot lifting transmission ball 63 is in contact fit with the reducing surface on the periphery of the presser foot lifting transmission cam 61, so that the presser foot lifting transmission cam 61 drives the presser foot lifting transmission crank 62 to rotate at a fixed rotation pivot through the presser foot lifting transmission ball 63, and drives the right lever 21 to rotate through the presser foot lifting transmission ejector rod 64, and the presser foot lifting mechanism 20 acts to drive the presser foot to lift and lower, so that automatic presser foot lifting is realized. The tapered surface refers to the offset circle of the cam, and the constant diameter surface refers to the base circle of the cam.

Further, as shown in fig. 2 and 3, the needle swing mechanism 80 further includes a needle swing transmission shaft 82 rotatably supported in the sewing machine housing, a first needle swing transmission unit drivingly connected between the main shaft 90 and the needle swing transmission shaft 82, and a second needle swing transmission unit drivingly connected between the needle swing transmission shaft 82 and the needle bar 103, the needle swing transmission shaft 82 is parallel to the main shaft 90, and the needle swing seat 81 is a component in the first needle swing transmission unit, and the position angle of the needle swing seat 81 directly determines the transmission efficiency of the first needle swing transmission unit, thereby determining the transmission efficiency of the needle swing mechanism 80.

Further, as shown in fig. 2 and 3, the first needle swing transmission unit includes a needle swing eccentric 83 fixed on a main shaft 90, a first needle swing link 84, a first needle swing link 85, a second needle swing link 86, a crank shaft 87 rotatably supported in a bottom plate of the sewing machine and parallel to the needle swing transmission shaft 82, a first needle swing crank 88 fixed on the crank shaft 87, a second needle swing link 89, and a second needle swing crank 810 fixed on a right end of the needle swing transmission shaft 82, an upper end of the first needle swing link 84 is rotatably fitted with an eccentric portion of the needle swing eccentric 83, a lower end of the first needle swing link 84, one end of the first needle swing link 85 and one end of the second needle swing link 86 are coaxially hinged by pins extending left and right, the other end of the first needle swing link 85 is hinged with the first needle swing crank 88, the other end of the second needle swing link 86 is hinged with the needle swing seat 81, and lower and upper ends of the second needle swing link 89 are respectively hinged with the first needle swing crank 88 and the second needle swing crank 810. The two first needle swing rods 85 and the two second needle swing rods 86 are respectively arranged at the left and right of the lower end of the first needle swing connecting rod 84, and the two second needle swing rods 86 are distributed and arranged between the first needle swing connecting rod 84 and the needle swing seat 81.

Preferably, as shown in fig. 3, a right crank arm 881 is integrally provided at the right end of the first needle swing crank 88, and a left crank arm 882 is integrally provided at the left end, the right crank arm 881 and the left crank arm 882 are distributed in a circumferentially staggered manner, the outer end of the crank arm is hinged with the first needle swing link 85, the outer end of the left crank arm 882 is hinged with the lower end of the second needle swing link 89, so that the hinge point of the first needle swing crank 88 and the first needle swing link 85 and the hinge point of the first needle swing crank 88 and the second needle swing link 89 are distributed in a circumferentially staggered manner.

Further, as shown in fig. 5, the second needle swing transmission unit includes a third needle swing crank 811 fixed to the left end of the needle swing transmission shaft 82, a third needle swing link 812, a needle swing guide 813, a needle swing shaft 814 rotatably supported in the sewing machine housing through a boss, and a needle bar bracket 815, both ends of the third needle swing link 812 are hinged with the third needle swing crank 811 and the needle swing guide 813, respectively, the needle swing guide 813 and the needle bar bracket 815 are fixed to the needle swing shaft 814, the needle swing shaft 814 is parallel to the main shaft 90, the needle swing shaft 814 constitutes a fixed swing fulcrum of the needle swing guide 813 and the needle bar bracket 815, and the needle bar 103 is installed in the needle bar bracket 815 to be movable up and down.

Further, as shown in fig. 5 and 6, the cloth punching mechanism 70 includes a needle bar crank 71, a take-up crank 72, a needle bar link 73, a needle bar slider 74, and a needle bar connecting post 75. Wherein, the needle bar crank 71 is fixedly locked at the left end of the main shaft 90 in the sewing machine through a screw; the take-up crank 72 includes a first shaft portion 721 and a second shaft portion 722 which are eccentrically provided, the first shaft portion 721 and the second shaft portion 722 are both parallel to the main shaft 90, and the first shaft portion 721 is eccentric to the main shaft 90 and fixed in the shank crank 71; the upper end of the needle bar connecting rod 73 is in rotary fit with the second shaft portion 722, the lower end of the needle bar connecting rod 73 is in rotary fit with the needle bar connecting column 75, and the left end of the needle bar connecting column 75 is fixedly locked on the needle bar 103 through a screw; the needle bar slider 74 is rotatably fitted around the outer periphery of the right end of the needle bar connecting post 75, a slide groove 816 parallel to the needle bar 103 is provided in the needle swing rail 813, and the needle bar slider 74 is slidably disposed in the slide groove 816 of the needle swing rail 813. Preferably, a take-up lever 130 is also mounted on the first shaft portion 721 of the take-up crank 72 for taking up.

Further, as shown in fig. 7, the lift-pin driving source 31 is a motor, preferably a stepping motor, and the lift-pin driving source 31 is fixed to the bottom plate of the sewing machine. The lifting mechanism 30 further includes a first lifting crank 32, a first lifting connecting rod 33, a lifting shaft 34 rotatably supported in the bottom plate of the sewing machine and parallel to the main shaft 90, a second lifting crank 35 and a third lifting crank 36 respectively fixed to the right end and the left end of the lifting shaft 34, and a second lifting connecting rod 37, the first lifting crank 32 is fixed to the motor shaft of the lifting driving source 31, two ends of the first lifting connecting rod 33 are respectively hinged to the first lifting crank 32 and the second lifting crank 35, and two ends of the second lifting connecting rod 37 are respectively hinged to the third lifting crank 36 and the rear end of the frame 101.

Further, as shown in fig. 7, the feeding driving source 41 is a motor, preferably a stepping motor, and the feeding driving source 41 is fixed to the sewing machine base plate. The feeding mechanism 40 further comprises a first feeding crank 42, a feeding connecting rod 43, a feeding shaft 44 rotatably supported in the bottom plate of the sewing machine and parallel to the main shaft 90, and a second feeding crank 45 and a bracket seat 46 respectively fixed at the right end and the left end of the feeding shaft 44, wherein the first feeding crank 42 is fixed on a motor shaft of the feeding driving source 41, two ends of the feeding connecting rod 43 are respectively hinged with the first feeding crank 42 and the second feeding crank 45, and the bracket seat 46 is connected with the front end of the bracket 101.

In conclusion, the sewing mode is switched and the presser foot is lifted by adopting one motor to drive, so that the sewing requirements of two functional scenes during sewing are met, and the cost is low; and the common feeding mode and the needle feeding mode are switched by one key, so that the machine is suitable for different sewing materials, has multiple functions, and further strengthens the universality and adaptability of the machine.

In summary, the present utility model effectively overcomes the disadvantages of the prior art and has high industrial utility value.

The above embodiments are merely illustrative of the principles of the present utility model and its effectiveness, and are not intended to limit the utility model. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the utility model. Accordingly, it is intended that all equivalent modifications and variations of the utility model be covered by the claims, which are within the ordinary skill of the art, be within the spirit and scope of the present disclosure.

Claims (11)

1. The utility model provides a sewing machine's needle pay-off switches and presser foot actuating mechanism, includes tooth frame (101), installs feeding tooth (102) on tooth frame (101), needle bar (103), installs needle (104) at needle bar (103) lower extreme, presser foot and lifts presser foot mechanism (20) that link to each other with the presser foot, its characterized in that: the needle swing mechanism (80) comprises a needle swing seat (81) with a fixed swing fulcrum, the position angle of the needle swing seat (81) determines the transmission efficiency of the needle swing mechanism (80), the needle swing driving source (120) is connected with the needle swing seat (20) through the needle swing adjusting unit (50), and the needle swing driving source (120) is connected with the needle swing seat (20) through the needle swing adjusting unit (50);

The operating range of the needle swing adjusting driving source (120) comprises a needle swing adjusting interval and a presser foot lifting interval which are mutually independent, wherein the needle swing adjusting interval comprises a zero needle distance position; when the needle swing adjusting driving source (120) is positioned at a needle distance position of zero needle feeding, the needle rod (103) is positioned in a vertical state, and the transmission efficiency of the needle swing mechanism (80) is zero.

2. The needle feed switching and presser foot drive mechanism of claim 1, wherein: the needle swing adjusting driving source (120) is a motor, the needle delivery adjusting switching unit (50) comprises a needle swing adjusting cam (51), a needle swing adjusting crank (52) with a fixed rotating fulcrum, a needle swing adjusting ball (53) rotatably arranged at one end of the needle swing adjusting crank (52) and a needle swing adjusting connecting rod (54), the needle swing adjusting cam (51) is fixed on a motor shaft of the needle swing adjusting driving source (120) and can be in contact fit with the needle swing adjusting ball (53), and two ends of the needle swing adjusting connecting rod (54) are hinged with the other end of the needle swing adjusting crank (52) and the needle swing swinging seat (81) respectively.

3. The needle feed switching and presser foot drive mechanism of claim 2, wherein: when the needle swing adjusting driving source (120) operates in a needle swing adjusting section, the needle swing adjusting ball (53) is in contact fit with a reducing surface on the periphery of the needle swing adjusting cam (51);

When the needle swing adjusting driving source (120) operates in the presser foot lifting section, the needle swing adjusting ball (53) is in contact fit with a constant diameter surface of the outer periphery of the needle swing adjusting cam (51), or the needle swing adjusting ball (53) is separated from the needle swing adjusting cam (51).

4. The needle feed switching and presser foot drive mechanism of claim 1, wherein: the needle swing adjusting driving source (120) is a motor, the presser foot lifting driving unit (60) comprises a presser foot lifting driving cam (61), a presser foot lifting driving crank (62) with a fixed rotating fulcrum, a presser foot lifting driving ball (63) rotatably arranged at one end of the presser foot lifting driving crank (62) and a presser foot lifting driving push rod (64), the presser foot lifting driving cam (61) is fixed on a motor shaft of the needle swing adjusting driving source (120) and can be in contact fit with the presser foot lifting driving ball (63), one end of the presser foot lifting driving push rod (64) is hinged with the other end of the presser foot lifting driving crank (62), and the other end of the presser foot lifting driving push rod (64) is connected with the presser foot lifting mechanism (20).

5. The needle feed switching and presser foot drive mechanism of claim 4, wherein: when the needle swing adjusting driving source (120) operates in the presser foot lifting interval, the presser foot lifting transmission ball (63) is in contact fit with a reducing surface on the periphery of the presser foot lifting transmission cam (61);

When the needle swing adjusting driving source (120) operates in the needle swing adjusting section, the presser foot lifting transmission ball (63) is in contact fit with a constant diameter surface on the periphery of the presser foot lifting transmission cam (61), or the presser foot lifting transmission ball (63) is separated from the presser foot lifting transmission cam (61).

6. The needle feed switching and presser foot drive mechanism of claim 1, wherein: the needle swing mechanism (80) further comprises a needle swing transmission shaft (82) rotatably supported in the sewing machine shell, a first needle swing transmission unit in transmission connection between the main shaft (90) and the needle swing transmission shaft (82), and a second needle swing transmission unit in transmission connection between the needle swing transmission shaft (82) and the needle rod (103), the needle swing transmission shaft (82) is parallel to the main shaft (90), and the needle swing seat (81) is a component in the first needle swing transmission unit.

7. The needle feed switching and presser foot drive mechanism of claim 6, wherein: the first needle swing transmission unit comprises a needle swing eccentric wheel (83) fixed on a main shaft (90), a first needle swing connecting rod (84), a first needle swing rod (85), a second needle swing rod (86), a crank rotating shaft (87) rotatably supported in a sewing machine bottom plate and parallel to the needle swing transmission shaft (82), a first needle swing crank (88) fixed on the crank rotating shaft (87), a second needle swing connecting rod (89) and a second needle swing crank (810) fixed at one end of the needle swing transmission shaft (82), one end of the first needle swing connecting rod (84) is in running fit with the needle swing eccentric wheel (83), the other end of the first needle swing connecting rod (84), one end of the first needle swing rod (85) and one end of the second needle swing rod (86) are coaxially hinged, the other end of the first needle swing rod (85) is hinged with the first needle swing crank (88), the other end of the second needle swing rod (86) is hinged with the needle swing seat (81), and one end of the second needle swing connecting rod (89) is hinged with the first needle swing crank (88) and two ends of the second needle swing rod (88).

8. The needle feed switching and presser foot drive mechanism of claim 6, wherein: the second needle swing transmission unit comprises a third needle swing crank (811) fixed at the other end of the needle swing transmission shaft (82), a third needle swing connecting rod (812), a needle swing guide rail (813), a needle swing shaft (814) rotatably supported in the sewing machine shell and a needle bar support (815), two ends of the third needle swing connecting rod (812) are respectively hinged with the third needle swing crank (811) and the needle swing guide rail (813), the needle swing guide rail (813) and the needle bar support (815) are both fixed on the needle swing shaft (814), and the needle bar (103) is installed in the needle bar support (815) in a vertically movable mode.

9. The needle feed switching and presser foot drive mechanism of claim 8, wherein: the needling mechanism (70) comprises a needle bar crank (71) fixed on a main shaft (90), a thread taking-up crank (72), a needle bar connecting rod (73), a needle bar sliding block (74) and a needle bar connecting column (75) with one end fixed on a needle bar (103), the thread taking-up crank (72) comprises a first shaft part (721) and a second shaft part (722) which are eccentrically arranged, the first shaft part (721) is eccentric to the main shaft (90) and fixed in the needle bar crank (71), two ends of the needle bar connecting rod (73) are respectively in running fit with the second shaft part (722) and the needle bar connecting column (75), the needle bar sliding block (74) is rotatably sleeved on the periphery of the needle bar connecting column (75), a sliding groove (816) parallel to the needle bar (103) is formed in a needle bar swinging guide rail (813), and the needle bar sliding block (74) is slidably arranged in the sliding groove (816) of the needle bar swinging guide rail (813).

10. The needle feed switching and presser foot drive mechanism of claim 1, wherein: the lifting tooth driving source (31) is a motor, the lifting tooth mechanism (30) further comprises a first lifting tooth crank (32), a first lifting tooth connecting rod (33), a lifting tooth shaft (34) rotatably supported in a sewing machine bottom plate and parallel to the main shaft (90), a second lifting tooth crank (35) and a third lifting tooth crank (36) which are respectively fixed at two ends of the lifting tooth shaft (34), and a second lifting tooth connecting rod (37), the first lifting tooth crank (32) is fixed on a motor shaft of the lifting tooth driving source (31), two ends of the first lifting tooth connecting rod (33) are hinged with the first lifting tooth crank (32) and the second lifting tooth crank (35) respectively, and two ends of the second lifting tooth connecting rod (37) are hinged with the third lifting tooth crank (36) and the tooth frame (101) respectively.

11. The needle feed switching and presser foot drive mechanism of claim 1, wherein: the feeding mechanism is characterized in that the feeding driving source (41) is a motor, the feeding mechanism (40) further comprises a first feeding crank (42), a feeding connecting rod (43), a feeding shaft (44) rotatably supported in a bottom plate of the sewing machine and parallel to the main shaft (90), and a second feeding crank (45) and a dental frame seat (46) which are respectively fixed at two ends of the feeding shaft (44), the first feeding crank (42) is fixed on a motor shaft of the feeding driving source (41), two ends of the feeding connecting rod (43) are hinged with the first feeding crank (42) and the second feeding crank (45) respectively, and the dental frame seat (46) is connected with the dental frame (101).