WO2021057216A1 - 一种缝纫机 - Google Patents

一种缝纫机 Download PDF

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Publication number
WO2021057216A1
WO2021057216A1 PCT/CN2020/103373 CN2020103373W WO2021057216A1 WO 2021057216 A1 WO2021057216 A1 WO 2021057216A1 CN 2020103373 W CN2020103373 W CN 2020103373W WO 2021057216 A1 WO2021057216 A1 WO 2021057216A1
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WO
WIPO (PCT)
Prior art keywords
lifting
link
tooth
presser foot
transmission
Prior art date
Application number
PCT/CN2020/103373
Other languages
English (en)
French (fr)
Inventor
管建平
林晓晓
徐帅
程传扬
Original Assignee
杰克缝纫机股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Application filed by 杰克缝纫机股份有限公司 filed Critical 杰克缝纫机股份有限公司
Publication of WO2021057216A1 publication Critical patent/WO2021057216A1/zh

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    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B29/00—Pressers; Presser feet
    • D05B29/02—Presser-control devices
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B27/00—Work-feeding means
    • D05B27/24—Feed-dog lifting and lowering devices
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B69/00—Driving-gear; Control devices
    • D05B69/10—Electrical or electromagnetic drives
    • D05B69/12—Electrical or electromagnetic drives using rotary electric motors
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B69/00—Driving-gear; Control devices
    • D05B69/20—Control devices responsive to the number of stitches made

Definitions

  • the invention relates to a sewing machine.
  • Sewing machines include lockstitch sewing machines, overlock sewing machines, interlock sewing machines, etc., which use one or more sewing threads to form one or more stitches on the sewing material to interweave or sew one or more layers of sewing material stand up.
  • the computerized lockstitch sewing machine is equipped with an automatic reverse stitching mechanism, an automatic dense stitching mechanism and an automatic presser foot lifting mechanism, and each mechanism is driven by an electromagnet to realize the function of automatic control.
  • the electromagnet is used to drive that the existing sewing machine has the following defects: 1.
  • the adjuster When the electromagnet drives the automatic reverse stitching mechanism, the adjuster is required to swing and strike the stud to change the stitch length, but the adjuster and the stud Noise will be emitted when impacted, which will affect the user experience; 2.
  • the automatic encryption stitching mechanism requires an independent electromagnet, and because of the continuous action with other reverse stitching and thread trimming, the power supply is insufficient, which affects the action effect; 3. Automatic After the presser foot lifting mechanism is driven by an electromagnet, the sound is louder, which affects the customer experience, and the current built-in automatic presser foot lifting mechanism causes the volume of the electromagnet to be small due to space constraints, which in turn makes the electromagnet insufficient and affects the use effect , And also shorten the service life of the electromagnet.
  • some sewing machines that use stepping motors to adjust the stitch length and use stepping motors to lift the presser feet have been introduced on the market. They use a stepping motor and a set of transmission mechanisms. Control the swing of the swing seat to adjust the stitch length. Another stepping motor is used to drive the presser foot up through another set of transmission mechanism. Therefore, a sewing machine is equipped with two stepping motors and corresponding control devices, which leads to higher costs. , It occupies a large space and generates heat, which makes it difficult to promote the technology in large quantities.
  • the Chinese invention patent with application number 201510515041.9 discloses a lockstitch sewing machine, which uses a stepping motor to simultaneously realize the two functions of stitch length adjustment and automatic presser foot lifting. It has a reciprocating rotation driven by a stepping motor.
  • the cam has a step-up and press-up convex part for pushing the step-up and pressing crank and for pushing the needle pitch Adjust the needle pitch adjustment protrusion of the crank.
  • the cam configured in the lockstitch machine has two functional protrusions, and the two functional protrusions are arranged misaligned along the axial direction of the cam, which is difficult to process, especially the needle pitch mechanism is prone to deviations in cam processing and installation accuracy. As a result, the needle pitch is inaccurate, and the cam surface transmission is easy to wear compared with the conventional pin hole fitting, which will also cause the needle pitch deviation.
  • the needle and the feed dog in the existing lockstitch machine are driven by the main shaft, and the needle and the feed dog are in a synchronous linkage relationship.
  • the needle and presser foot in the lockstitch machine Before sewing on the lockstitch machine, in order to ensure that the sewing material is placed under the presser foot and the needle plate normally, the needle and presser foot in the lockstitch machine must be located above the needle plate, and the needle is rotated by the operator
  • the hand wheel fixed at the end of the main shaft drives the movement to make the needle move to the highest point; when the needle is above the needle plate and moves to the highest point (that is, the upper needle stop position), due to the synchronous connection between the needle and the feed dog
  • the feeding teeth also emerge from the tooth groove of the needle plate upwards, that is, a part of the feeding teeth is exposed upward on the needle plate. At this time, the feeding teeth will hinder the sewing material from being put in, and the sewing material cannot be placed on the needle plate evenly. The above, especially for elastic thin materials, which further affects the sewing
  • the object of the present invention is to provide a sewing machine that is driven by the same driving source to adjust the stitch length, raise the presser foot, and lower the feed dog.
  • the present invention provides a sewing machine including a main shaft, a tooth frame, a feeding tooth mounted on the tooth frame, a feeding mechanism connected between the main shaft and one end of the tooth frame, and a feeding mechanism connected between the main shaft and the other end of the tooth frame
  • the feeding mechanism includes a A needle pitch seat with a fixed swing fulcrum
  • the first transmission clutch mechanism acts between the driving cam and the needle pitch seat
  • the second transmission clutch mechanism acts on a driving cam and a presser foot lifting mechanism.
  • the second transmission clutch mechanism causes the drive cam and the presser foot transmission component to be between the drive cam and the tooth lifting transmission component. There is no power transmission at all; at this time, the driving source drives the driving cam to rotate, and the driving cam drives the pitch seat to rotate around the first fixed swing fulcrum through the first transmission clutch mechanism;
  • the first transmission clutch mechanism causes the driving cam and the needle pitch seat to be There is no power transmission; at this time, the driving source drives the driving cam to rotate, and the driving cam drives the presser foot mechanism to move through the second transmission clutch mechanism to lift the presser foot upward, and the driving cam is through the second transmission clutch
  • the mechanism simultaneously drives the action of the tooth lifting mechanism to lower the tooth frame and the feeding tooth.
  • the driving source is a motor
  • the driving cam is fixed on the motor shaft of the motor.
  • the first transmission clutch mechanism includes a first connecting rod, a second connecting rod, a stop plate fixed to the needle pitch seat, a fixed support fixed to the sewing machine housing, and a first spring.
  • the two ends of the connecting rod are respectively hinged with the driving cam and the second connecting rod, the second connecting rod is hinged with the needle pitch seat, and the stop plate is provided with a limit part capable of abutting against the fixed support.
  • the two ends of the first spring are respectively connected to the stop plate and the fixed support, so that the stop plate has the movement tendency of the stopper to move closer to the fixed support; when the first connecting rod and the second connecting rod are collinear, The first transmission clutch mechanism enables power transmission between the driving cam and the needle pitch seat, and the limit part does not abut the fixed support; when the first connecting rod and the second connecting rod are not collinear, The first transmission clutch mechanism causes no power transmission between the driving cam and the needle pitch seat, and the limit part abuts against the fixed support.
  • a driving torsion spring is sleeved at the hinge joint of the first connecting rod and the second connecting rod.
  • the limiting portion is located above the fixed support.
  • the end surface of the fixed support facing the limiting portion is fixed with a limited shock absorbing block, and the limiting portion has a contact surface facing the fixed support, and the contact surface is a straight surface and can interact with the limiting portion.
  • the shock-absorbing block abuts.
  • the feeding mechanism includes a feeding shaft parallel to the main shaft, a first feeding transmission unit connected between the main shaft and the feeding shaft, and a second feeding transmission unit connected between the feeding shaft and the bracket;
  • a feeding transmission unit includes a feeding eccentric fixed on the main shaft, a feeding connecting rod, a first swinging plate, a second swinging plate, a feeding crank fixed on the feeding shaft, and the needle pitch seat, the feeding connecting rod
  • One end is rotatably mounted on the outer periphery of the feeding eccentric, the other end of the feeding link, one end of the first swinging plate, and one end of the second swinging plate are coaxially hinged, and the other end of the first swinging plate is coaxially hinged with the needle
  • the distance seat is hinged, and the other end of the second swing plate is hinged with the feeding crank.
  • the second transmission clutch mechanism includes a drive plate with a second fixed swing fulcrum, a roller rotatably installed at one end of the drive plate, a presser foot drive link, and a lower supply drive link.
  • the other end of the plate, one end of the presser foot drive link, and one end of the lower supply drive link are coaxially hinged, and the other end of the presser foot drive link is connected to the presser foot transmission component, and the lower
  • the other end of the driving link is connected with the tooth lifting transmission component, and the outer peripheral surface of the driving cam has a variable diameter driving surface; when the roller contacts and cooperates with the variable diameter driving surface on the driving cam,
  • the second transmission clutch mechanism enables power transmission between the drive cam and the presser foot-lifting transmission component, and between the drive cam and the tooth-lifting transmission component; when the roller does not contact and cooperate with the reducing drive surface on the drive cam At this time, the second transmission clutch mechanism causes no power transmission between the drive cam and the presser foot lifting transmission component, and between the drive cam
  • the outer peripheral surface of the driving cam has a groove portion, and the groove portion is arranged adjacent to the diameter-reducing driving surface; when the roller and the diameter-reducing driving surface on the driving cam are not in contact with each other, The roller is located in the groove and does not contact the driving cam.
  • the lower supply driving link and the tooth lifting transmission part are hinged by a first axial screw parallel to the main shaft, and the lower end of the lower supply driving link is provided with a first sliding groove extending up and down.
  • An axial screw passes through the first sliding groove and can abut the upper and lower ends of the first sliding groove.
  • the tooth-lifting mechanism includes a tooth-lifting shaft parallel to the main shaft, a first tooth-lifting transmission unit connected between the main shaft and the tooth-lifting shaft, and a second tooth-lifting shaft connected between the tooth-lifting shaft and the tooth frame.
  • the first gear lifting transmission unit includes a lifting eccentric wheel fixed on the main shaft, a first lifting connecting rod, a second lifting connecting rod, and a lifting crank fixed on the lifting shaft, the One end of the first lifting link is rotatably mounted on the outer circumference of the lifting eccentric, and the other end of the first lifting link, the second lifting link, and the lifting crank are coaxially hinged, and the The second tooth-lifting link is also hinged with the first tooth-lifting link, and the second tooth-lifting link also constitutes the tooth-lifting transmission component.
  • first lifting link, the second lifting link, and the lifting crank are hinged by a second axial screw parallel to the main shaft, and the lower end of the first lifting link is provided with A second sliding groove extending up and down, the second axial screw is inserted in the second sliding groove; the first and second lifting links also pass through a third axial position parallel to the main shaft
  • the screw is hinged, a horizontally extending third sliding groove is opened in the second tooth lifting link, and the third axial screw is penetrated in the third sliding groove.
  • the second tooth lifting link is concave, and includes a rod body part extending up and down, an upper rod arm part extending horizontally from the upper end of the rod body part, and a lower rod arm part extending horizontally from the lower end of the rod body part
  • the second axial screw passes through the junction of the rod body and the lower rod arm, and the third sliding groove is opened at the upper end of the rod body and the side facing away from the upper rod arm.
  • the first tooth lifting transmission unit further includes a second spring, both ends of the second spring are respectively connected with the first tooth lifting link and the second tooth lifting link, so that the third axial screw has a direction Movement trend near the bottom of the third chute.
  • the presser foot lifting mechanism has a right lever with a third fixed swing fulcrum, a presser foot pull rod, a left lever with a fourth fixed swing fulcrum, a presser foot lifting plate, a press rod guide, and a presser that extends up and down.
  • the right lever constitutes the presser foot lifting transmission part, the other end of the right lever is hinged with one end of the presser foot lever, the other end of the presser foot lever is hinged with one end of the left lever, and the left
  • the other end of the lever is hinged to the upper end of the presser foot lifting plate, the presser foot lifting plate is provided with a lifting hook, and the press rod guide frame is provided with a connecting protrusion that engages with the lifting hook, and
  • the pressing rod guide frame is fixed at the upper end of the pressing rod, and the pressing foot is installed at the lower end of the pressing rod.
  • the sewing machine related to the present invention has the following beneficial effects:
  • This application uses one drive source to control the stitch length of the sewing machine, lift the presser foot, and the automatic lowering of the feeding teeth during feeding.
  • the adjustment of the stitch length also realizes the sewing machine's forward stitching, reverse stitching and dense stitching.
  • the present application can greatly reduce the cost, has a more compact structure, and occupies a smaller space, which is conducive to the popularization and application of the technology.
  • Figure 1 is a schematic diagram of the structure of the sewing machine in this application.
  • FIG. 2 is a schematic diagram of the structure of FIG. 1 from another perspective, and the casing and driving source in FIG. 1 are omitted.
  • FIG. 3 is a schematic diagram of the structure of FIG. 1 from another perspective, and the casing in FIG. 1 is omitted.
  • Fig. 4 is a schematic diagram of the connection between the driving cam, the first transmission clutch mechanism, and the needle pitch seat in this application.
  • FIG. 5 is a schematic diagram of the connection between the driving cam, the second transmission clutch mechanism, and the second tooth lifting link in this application.
  • FIG. 6 is a schematic diagram of the structure of the first tooth lifting transmission unit in this application.
  • Fig. 7 is a schematic diagram of the structure of the first tooth-raising connecting rod in this application.
  • FIG. 8 is a schematic diagram of the structure of the second tooth-raising connecting rod in this application.
  • Figure 9 is a state diagram of the sewing machine in the application when the stitch length is adjusted.
  • Figure 10 is a state diagram of the sewing machine in this application when the presser foot is raised.
  • Figure 11 is a state diagram of the sewing machine in this application when it is under feeding and unloading.
  • the sewing machine includes a casing 130, a main shaft 10 rotatably installed in the casing 130, and a main motor installed in the casing 130 and driving the main shaft 10 to rotate.
  • the axial direction of the main shaft 10 is defined as the left and right direction
  • the direction of the main shaft 10 facing the sewing machine head is the left direction, that is, the direction in which the main shaft 10 faces the left side of the paper in the view of FIG. 3, and the main shaft 10 faces the end of the sewing machine.
  • the direction is the right direction, that is, the direction in which the main shaft 10 faces the right side of the paper in the view of FIG. 3; the moving direction of the sewing material when the sewing machine is sewing is defined as the front direction.
  • the sewing machine further includes a tooth frame 20, a feeding tooth 30 fixedly mounted on the tooth frame 20, a feeding mechanism 40 connected between the main shaft 10 and the front end of the tooth frame 20, and connected to the main shaft 10 and the tooth frame.
  • the feeding mechanism 40 includes a needle pitch seat 41 with a first fixed swing fulcrum O1;
  • the first transmission clutch mechanism 70 acts between the driving cam 120 and the needle pitch seat 41 to realize the driving cam 120 Whether there is power transmission between the needle base 41 and the needle pitch seat 41;
  • the second transmission clutch mechanism 80 acts on the driving cam 120, a presser foot lifting transmission part in the presser foot lifting mechanism 60, and a tooth lifting transmission part in the tooth lifting mechanism 50 It is used to realize whether there is power transmission between the driving cam 120 and
  • the driving cam 120 When the sewing machine is sewing normally, the driving source 110 does not operate, the driving cam 120 is in a static state, the main motor drives the spindle 10 to rotate, and the spindle 10 drives the tooth frame 20 and the feeding tooth 30 through the feeding mechanism 40 to reciprocate back and forth together.
  • the mechanism 50 drives the tooth frame 20 and the feeding tooth 30 to reciprocate up and down together, so the feeding tooth 30 performs a periodic compound movement of back and forth reciprocating motion and up and down reciprocating motion, and the movement track of the feeding tooth 30 is elliptical.
  • the needle plate 140 in the sewing machine is provided with a plurality of tooth grooves extending back and forth. The feeding teeth 30 can emerge upward in the tooth grooves and are exposed on the upper surface of the needle plate 140.
  • the tooth frame 20 is located on the needle plate. Below 140.
  • the first transmission clutch mechanism 70 enables power transmission between the driving cam 120 and the needle pitch seat 41, but the second transmission clutch mechanism 80 enables the driving cam 120 and the presser foot lifting transmission member to be driven, There is no power transmission between the cam 120 and the gear lifting transmission component; at this time, the driving source 110 drives the driving cam 120 to rotate, and the driving cam 120 drives the needle pitch seat 41 to rotate around the first fixed swing fulcrum O1 through the first transmission clutch mechanism 70,
  • the movement range of the main shaft 10 through the feeding mechanism 40 to drive the tooth frame 20 and the feeding tooth 30 to reciprocate back and forth can be changed to realize the stitch length adjustment; and by changing the stitch length, the sewing machine's forward stitching, reverse stitching and dense stitching can be realized at the same time Function.
  • the second transmission clutch mechanism 80 enables power transmission between the driving cam 120 and the presser foot lifting transmission part, and between the driving cam 120 and the thread lifting transmission part, but the first transmission clutch mechanism 70 There is no power transmission between the driving cam 120 and the stitch base 41; at this time, the driving source 110 drives the driving cam 120 to rotate, and the driving cam 120 drives the presser foot lifting mechanism 60 through the second transmission clutch mechanism 80 to move, so that the presser foot 90 moves upwards
  • the driving cam 120 also drives the lifting mechanism 50 through the second transmission clutch mechanism 80 to lower the bracket 20 and the feeding teeth 30, so that the feeding teeth 30 are automatically moved down to the needle plate 140 while the presser foot is raised. Below the surface, the downward feeding and unwinding action is performed, which is convenient to put the sewing material between the needle plate 140 and the presser foot 90, or to take away the sewing material between the needle plate 140 and the presser foot 90.
  • the present application uses one drive source 110 to control the stitch length adjustment, presser foot lifting, and automatic lowering of the feed dog 30 during feeding (ie, lower feeding and feeding) of the sewing machine.
  • the stitch length adjustment can also be realized at the same time. Switching between forward sewing, reverse sewing and encryption sewing on the sewing machine.
  • the present application uses the first transmission clutch mechanism 70 and the second transmission clutch mechanism 80 to realize that when the driving source 110 controls the sewing machine to adjust the stitch length, the sewing machine does not perform the actions of lifting the presser foot and automatically lowering the feed dog 30, and the driving source 110 controls the sewing machine When the presser foot lifter and the feed dog 30 are automatically lowered, the sewing machine does not perform the stitch length adjustment action (that is, when the drive source 110 controls the sewing machine presser foot lifter and the feed dog 30 to automatically lower and then resets, the stitch pitch of the sewing machine does not change).
  • the present application can greatly reduce the cost, has a more compact structure, and occupies a smaller space, which is conducive to the popularization and application of the technology.
  • the driving source 110 is a motor, which is fixedly installed in the casing 130.
  • a stepping motor is selected; the driving cam 120 is fixed on the motor shaft of the motor, and the motor directly drives the driving cam 120 rotations.
  • the feeding mechanism 40 includes a feeding shaft 42 parallel to the main shaft 10, a first feeding transmission unit connected between the main shaft 10 and the right end of the feeding shaft 42, and a connection In the second feeding transmission unit between the left end of the feeding shaft 42 and the front end of the bracket 20, the feeding shaft 42 is rotatably installed in the sewing machine housing 130.
  • the first feeding transmission unit includes a feeding eccentric 43 fixed on the main shaft 10, a feeding connecting rod 44, a first swinging plate 45, a second swinging plate 46, a feeding crank 47 fixed on the right end of the feeding shaft 42, and a stitch length.
  • the upper end of the feeding link 44 is rotatably mounted on the outer circumference of the feeding eccentric 43, the lower end of the feeding link 44, the rear end of the first swing plate 45, and the rear end of the second swing plate 46 extend left and right
  • the front end of the first swinging plate 45 is hinged with the pitch seat 41 through an axial pin extending left and right
  • the front end of the second swinging plate 46 is hinged with the feed crank 47 through an axial pin extending left and right.
  • the left and right sides of the pitch seat 41 are respectively rotatably mounted on first support pins 48 extending left and right.
  • the first support pins 48 are fixed in the casing 130.
  • the first support pins 48 constitute the first fixed swing of the pitch seat 41
  • the fulcrum O1 and the pitch seat 41 can rotate around the first support pin 48.
  • the second feeding transmission unit includes a bracket seat 49 fixed at the left end of the feeding shaft 42, and the bracket seat 49 is connected to the front end of the bracket 20.
  • the main shaft 10 drives the feeding shaft 42 to swing through the first feeding transmission unit, and the feeding shaft 42 drives the tooth frame 20 to reciprocate back and forth through the second feeding transmission unit.
  • the position angle of the needle pitch seat 41 in the first feeding transmission unit directly determines the main shaft 10 and the feeding
  • the transmission efficiency between the shafts 42 can be changed by changing the position and angle of the needle pitch seat 41 to change the swing amplitude of the spindle 10 driving the feeding shaft 42 to swing, thereby changing the motion amplitude of the reciprocating movement of the tooth frame 20 and the feeding tooth 30 back and forth to realize the needle Pitch adjustment and switching between forward sewing, reverse sewing and encryption sewing.
  • the preferred structure of the first transmission clutch mechanism 70 is: as shown in Figures 2 and 4, the first transmission clutch mechanism 70 includes a first connecting rod 71, a second connecting rod 72, and a stop plate fixed at the rear end of the needle pitch seat 41 73.
  • a fixed support 74 fixed to the sewing machine housing 130, and a first spring 75; between the upper end of the first link 71 and the driving cam 120, and between the lower end of the first link 71 and the upper end of the second link 72 And the lower end of the second link 72 and the needle pitch seat 41 are respectively hinged by axial pins extending left and right, and the hinge point of the second link 72 and the pitch seat 41 is located behind the first fixed swing fulcrum O1
  • the upper end of the rear side of the stop plate 73 is provided with a limiting portion 731, which is located above the rear part of the fixed support 74 and can abut against the fixed support 74; the front end of the first spring 75 and the fixed The front part of the support 74 is connected, and the rear end of
  • the first spring 75 exerts an oblique downward pulling force on the stop plate 73 to keep the stop plate 73 toward the first
  • a spring 75 has a tendency to rotate in the direction of the pulling force; therefore, under the action of the first spring 75, the stop plate 73 and the pitch seat 41 have a tendency to rotate downward about the first support pin 48, that is, the stop plate 73 and
  • the needle pitch seat 41 has a movement tendency that the upper limit portion 731 of the stop plate 73 rotates downward in a direction close to the fixed support 74.
  • first transmission clutch mechanism 70 when the first link 71 and the second link 72 are collinear, that is, the hinge point of the driving cam 120 and the first link 71, the first link 71 and the second link 72 When the hinge point of the second link 72 and the hinge point of the needle pitch seat 41 are collinear at three points, the first link 71 and the second link 72 are equivalent to one link, and the first transmission clutch mechanism 70 drives There is power transmission between the cam 120 and the needle pitch seat 41 to realize the movement of the driving cam 120 and the needle pitch seat 41, that is, to realize the movement of the driving source 110 and the needle pitch seat 41; the limit part 731 and The fixed supports 74 are in a non-abutting and non-contacting state; at this time, when the driving source 110 drives the driving cam 120 to rotate, the driving cam 120 drives the needle pitch seat 41 through the first connecting rod 71 and the second connecting rod 72.
  • the rotation of the first fixed swing fulcrum O1 can change the position angle of the needle pitch seat 41.
  • the first link 71 and the second link 72 are not collinear, that is, the hinge point of the driving cam 120 and the first link 71, the hinge point of the first link 71 and the second link 72, and the second link
  • the first transmission clutch mechanism 70 causes no power transmission between the driving cam 120 and the needle pitch seat 41, and realizes the movement between the driving cam 120 and the needle pitch seat 41
  • the separation of the drive source 110 and the needle pitch seat 41 is realized; at the same time, the limit part 731 and the fixed support 74 are in abutment state; at this time, the drive source 110 drives the drive cam 120 to rotate At this time, no matter how the driving cam 120 rotates, the driving cam 120 through the first link 71 and the second link 72 will not drive the pitch seat 41 to rotate, that is, the pitch seat 41 remains stationary.
  • the sewing machine is located at the maximum stitch length of the forward sewing, that is, the sewing machine has the maximum positive stitch length at this time; the sewing machine is adjusting the needle
  • the hinge point between the driving cam 120 and the first link 71, the hinge point between the first link 71 and the second link 72, and the hinge point between the second link 72 and the needle pitch seat 41 always share the same three points.
  • the three points of the hinge point of the second link 72 and the hinge point of the second link 72 and the pitch seat 41 are always collinear.
  • the driving source 110 drives the driving cam 120 to rotate, and the driving cam 120 drives the needle pitch seat 41 and the stop plate 73 to swing downward through the first link 71 and the second link 72.
  • the limit part 731 When the limit part 731 is close to the fixed support 74, the stitch length of the sewing machine gradually increases, and the limit part 731 gradually approaches the fixed support 74; when the limit part 731 abuts against the fixed support 74, it follows the driving cam 120 Continue to rotate, the sewing machine crosses the maximum positive stitch length, and drives the hinge point between the cam 120 and the first link 71, the hinge point between the first link 71 and the second link 72, and the second link 72 and the stitch length
  • the three points of the hinge point of the seat 41 are changed from a three-point collinear state to a three-point non-collinear state, and accordingly the first link 71 and the second link 72 are changed from a collinear state to an angled state;
  • the presser foot 90, the feed dog 30, the driving cam 120, the stitch base 41 and the stop plate 73 will all reset, and the limit part 731 and the fixed support 74 will be reset from the contact state to the disengaged state ,
  • both the stop plate 73 and the fixed support 74 are provided with a hook portion connected to the first spring 75.
  • a drive torsion spring 76 is sleeved at the hinge joint of the first link 71 and the second link 72. The two ends of the drive torsion spring 76 are respectively connected to the first link 71 and the second link 72.
  • the drive torsion spring 76 makes the second link
  • the one connecting rod 71 and the second connecting rod 72 maintain a non-collinear bending tendency, and then when the presser foot is raised and the material is fed, the first connecting rod 71 and the second connecting rod 72 change from a collinear state to a clamping Give the turning direction in the corner state.
  • the upper end surface of the fixed support 74 facing the limit portion 731 fixes the limit shock-absorbing block 77
  • the lower end surface of the limit portion 731 is a contact surface facing the fixed support 74
  • the contact surface is a straight surface and can be reduced from the limit.
  • the shock block 77 abuts; therefore, when the contact surface of the limit portion 731 and the fixed support 74 change from the disengaged state to the abutting state, the contact surface on the limit portion 731 hits the limit shock absorbing block 77, and the limit reduces
  • the shock block 77 serves as a buffer and can reduce the noise generated by the impact.
  • the preferred structure of the second transmission clutch mechanism 80 is: as shown in Figures 2 and 5, the second transmission clutch mechanism 80 includes a drive plate 81 with a second fixed swing fulcrum O2, and a roller rotatably installed at the rear end of the drive plate 81.
  • the column 82, the presser foot drive link 83, and the lower supply drive link 84, the front end of the drive plate 81, the lower end of the presser foot drive link 83, and the upper end of the lower supply drive link 84 pass through a shaft extending back and forth
  • the position pin is coaxially hinged, the upper end of the presser foot driving link 83 is connected with the presser foot lifting transmission part of the presser foot lifting mechanism 60, and the lower end of the lower supply driving link 84 is connected with the tooth lifting transmission part of the tooth lifting mechanism 50 ,
  • the outer peripheral surface of the driving cam 120 has a section of a diameter-reducing driving surface 121.
  • the roller 82 does not contact and cooperate with the reducing driving surface 121 on the driving cam 120. At this time, there is no power transmission between the roller 82 and the driving cam 120.
  • the second transmission clutch mechanism 80 enables no power transmission between the driving cam 120 and the presser foot lifting transmission part, and between the driving cam 120 and the tooth lifting transmission part, and realizes between the driving cam 120 and the presser foot lifting transmission part, and the driving cam
  • the movement separation between 120 and the tooth-lifting transmission component is realized between the driving source 110 and the presser foot-lifting mechanism 60, and between the driving source 110 and the tooth-lifting mechanism 50.
  • the roller 82 contacts and cooperates with the reducing driving surface 121 on the driving cam 120.
  • the driving cam 120 changes The radial driving surface 121 pushes the roller 82, and the driving plate 81 rotates around the second fixed swing fulcrum O2 through the roller 82, and the driving plate 81 will drive the presser foot lifting transmission part through the presser foot drive link 83, and the drive plate 81 will simultaneously
  • the lower drive link 84 will also drive the tooth lifting transmission part to move, so the second transmission clutch mechanism 80 makes the driving cam 120 and the presser foot lifting transmission part, and between the driving cam 120 and the lifting transmission part have power.
  • the non-power transmission of the roller 82 and the driving cam 120 can be realized as follows: Method 1, as shown in FIG. 5, the driving cam 120 There is a groove portion 122 on the outer peripheral surface, which is arranged adjacent to the reducing driving surface 121; when the driving source 110 drives the driving cam 120 to rotate, the groove portion 122 on the driving cam 120 rotates below the roller 82 , The roller 82 is located in the groove 122, but there is no contact between the roller 82 and the outer peripheral surface of the driving cam 120, and the two are in a disengaged state, thereby realizing the diameter-reducing driving surface of the roller 82 and the driving cam 120 There is no power transmission between the roller 82 and the driving cam 120 when 121 is not in contact with each other.
  • Manner 2 An equal-diameter drive surface adjacent to the variable-diameter drive surface 121 is provided on the outer peripheral surface of the drive cam 120; when the drive source 110 drives the drive cam 120 to rotate, the equal-diameter drive surface on the drive cam 120 rotates to the roller When below 82, the roller 82 contacts and cooperates with the equal-diameter driving surface, so that when the roller 82 and the variable-diameter driving surface 121 on the driving cam 120 do not contact and cooperate, there is no power transmission between the roller 82 and the driving cam 120.
  • the right end surface of the drive plate 81 is rotatably mounted on a second support pin 85 extending left and right.
  • the second support pin 85 is fixed in the casing 130, and the second support pin 85 constitutes the drive plate.
  • the driving plate 81 can rotate around the second supporting pin 85.
  • the lower driving link 84 and the gear lifting transmission part are hinged by a first axis screw 150 parallel to the main shaft 10, and the lower end of the lower driving link 84 is provided with a first sliding groove 841 extending up and down.
  • the screw 150 is inserted in the first sliding groove 841 and the two are slidingly matched, and the first axial screw 150 can abut the upper and lower ends of the first sliding groove 841.
  • the first axis is located at the lower end of the first chute 841; when the presser foot starts to be lifted, the drive plate 81 drives the presser foot drive link 83 and the lower supply drive link 84 to move down to lift the presser foot
  • the transmission component starts to move and starts to lift the presser foot, but the first sliding groove 841 of the lower driving link 84 moves down relative to the first axis screw 150, so the lower driving link 84 will not drive the lifting transmission member to move;
  • the lower feed drive connecting rod 84 will drive the tooth lifting transmission component to start the lower feed and discharge.
  • the preferred structure of the tooth-lifting mechanism 50 is: as shown in FIGS. 2 and 3, and FIGS. 5 and 6, the tooth-lifting mechanism 50 includes a tooth-lifting shaft 51 parallel to the main shaft 10, connected to the right end of the main shaft 10 and the tooth-lifting shaft 51
  • the first gear raising transmission unit between the two and a second gear raising transmission unit connected between the left end of the gear raising shaft 51 and the rear end of the support frame 20 are rotatably installed in the sewing machine housing 130.
  • the first tooth lifting transmission unit includes a tooth lifting eccentric 52 fixed on the main shaft 10, a first lifting link 53, a second lifting link 54, and a lifting crank 55 fixed on the lifting shaft 51 ,
  • the upper end of the first lifting link 53 is rotatably mounted on the outer periphery of the lifting eccentric 52, the lower end of the first lifting link 53, the lower end of the second lifting link 54, and the lifting crank 55 pass through a
  • the second axial screw 160 extending left and right is hinged coaxially.
  • the upper end of the second lifting link 54 is also hinged with the middle part of the first lifting link 53 by a third axial screw 170 extending left and right.
  • the tooth connecting rod 54 also constitutes a tooth-lifting transmission component and is connected to the second transmission clutch mechanism 80, that is, the lower end of the lower supply driving link 84 and the second tooth-lifting link 54 are hinged by the above-mentioned first axial screw 150.
  • the second tooth-lifting transmission unit includes a tooth-lifting fork 57 fixed at the left end of the tooth-lifting shaft 51, a tooth-lifting chute opened in the tooth-lifting fork 57, and a tooth-lifting slider 58 slidingly matched with the tooth-lifting chute.
  • the sliding block 58 and the rear end of the tooth frame 20 are hinged by an axial pin extending left and right.
  • the lower end of the first tooth lifting link 53 is provided with a second sliding groove 531 extending up and down, and the first tooth lifting link 53 and the second tooth lifting link 54 are coaxially hinged.
  • the second axis screw 160 of the lifting crank 55 is inserted in the second sliding groove 531, and the two slidingly cooperated;
  • the second lifting connecting rod 54 is provided with a horizontally extending third sliding groove 544, which is hinged to the first lifting
  • the third axial screw 170 of the tooth connecting rod 53 and the second tooth lifting connecting rod 54 is inserted in the third chute 544, so that the first tooth lifting connecting rod 53 does not interfere with the second tooth lifting connecting rod when feeding and unloading. 54 sports.
  • the second tooth lifting link 54 is concave, and includes a rod portion 541 extending up and down, an upper rod arm portion 542 extending horizontally forward from the upper end of the rod portion 541, and horizontally forward from the lower end of the rod portion 541
  • the extended lower lever arm portion 543, the second axial screw 160 penetrates the joint of the lever body portion 541 and the lower lever arm portion 543, and the third sliding groove 544 is opened on the upper end of the lever body portion 541 and the back of the lever arm
  • the third sliding groove 544 is a U-shaped groove with an opening facing rearward.
  • the first lifting transmission unit further includes a second spring 56.
  • a spring hanging pin 59 is fixed on the middle section of the first lifting link 53 and the front end of the upper lever arm 542 in the second lifting link 54.
  • the rear end of the second spring 56 is connected with the spring hanging pin 59 on the first lifting link 53
  • the front end of the second spring 56 is connected with the spring hanging pin 59 on the upper lever arm 542 of the second lifting link 54 Connected, so that the second spring 56 is connected between the first lifting link 53 and the second lifting link 54; under the pulling force of the second spring 56, the first lifting link 53 and the third axial position
  • the screw 170 has a forward movement tendency, so that the third axial screw 170 has a forward movement tendency to be close to the bottom of the third sliding groove 544, keeping the third axial screw 170 at the bottom of the third sliding groove 544 .
  • the preferred structure of the presser foot mechanism 60 is: as shown in FIGS. 2 and 3, and FIG. 10, the presser foot mechanism 60 has a right lever 61 with a third fixed swing fulcrum O3, a presser foot lever 62, and a fourth fixed The left lever 63 of the swing fulcrum O4, the presser foot lifting plate 64, the press rod guide 65, and the press rod 66 extending up and down; wherein, the right lever 61 and the left lever 63 are hinged to the casing through the axial pin extending forward and backward.
  • the right lever 61 constitutes the presser foot drive component, and is connected to the second transmission clutch mechanism 80, that is, the upper end of the presser foot drive link 83 is hinged to the right end of the right lever 61; the left end of the right lever 61 and the presser foot lever 62
  • the right end of the presser foot lifting lever 62 is hinged to the upper right of the left lever 63, the lower left end of the left lever 63 is hinged to the upper end of the presser foot lifting plate 64, and the presser foot lifting plate 64 is provided with a lifting hook
  • the pressing rod guide 65 is provided with a connecting protrusion that engages with the lifting hook.
  • the pressing rod guide 65 is fixed at the upper end of the pressing rod 66, the pressing foot 90 is installed at the lower end of the pressing rod 66, and the pressing foot 90 is located on the needle plate. 140 above.
  • the feeding eccentric wheel 43 and the tooth lifting eccentric wheel 52 can be two independent eccentric wheels, or they can be combined into one eccentric wheel.
  • the eccentric wheel has a feeding eccentric part connected with the feeding connecting rod 44 and a tooth lifting eccentric part connected with the first lifting connecting rod 53.
  • the stitch length of the sewing machine has negative and positive values.
  • the sewing machine is in the reverse stitching mode.
  • the smaller the stitch length the larger the stitch length of the reverse stitch; the stitch length of the sewing machine is 0 or close to 0.
  • the sewing machine is in the dense sewing mode; when the stitch length of the sewing machine is positive, the sewing machine is in the forward sewing mode.
  • the larger the stitch length the larger the forward stitching.
  • the limit part 731 on the stop plate 73 and the limit shock block 77 on the fixed support 74 are always in a disengaged state, and the drive cam 120 is hinged with the first link 71
  • the three points, the hinge point between the first link 71 and the second link 72, and the hinge point between the second link 72 and the pitch seat 41, are always collinear.
  • the driving source 110 drives the driving cam 120 to rotate counterclockwise, and the groove 122 on the driving cam 120 is located below the roller 82, so the driving cam 120 and the roller There is no contact or suspension between 82, the roller 82 and the driving plate 81 remain stationary, and there is no power transmission between the driving cam 120 and the presser foot lifting transmission part, and between the driving cam 120 and the tooth lifting transmission part, so the presser foot is lifted
  • the mechanism 60 and the tooth lifting mechanism 50 do not work; at the same time, the driving cam 120 drives the needle pitch seat 41 through the first link 71 and the second link 72 to rotate clockwise around the first fixed swing fulcrum O1, changing the pitch seat 41
  • the position angle of the needle pitch seat 41 directly controls the swing amplitude of the feeding crank 47 and the feeding shaft 42, that is, the movement range of the tooth frame 20 and the feeding tooth 30 in the front and rear directions, so as to control the stitch length of the sewing machine .
  • the needle pitch seat 41 drives the stop plate 73 to rotate clockwise around the first fixed swing fulcrum O1, overcomes the pulling force of the first spring 75, and the stop 731 on the stop plate 73 moves upward and further away from the fixed support 74 Limit damping block 77.
  • the driving source 110 stops, the driving cam 120 remains at the current position, the stitch seat 41 is stationary through the first connecting rod 71 and the second connecting rod 72, and the sewing machine maintains the adjusted stitch length value .
  • the stitch length of the sewing machine gradually decreases from the maximum stitch length of the forward stitching, after passing the zero stitch length in the dense stitching mode, and then entering the negative value in the reverse stitching mode.
  • the stitch length is reduced to the maximum stitch length of the reverse stitching; in this process, the stitch length value is gradually reduced, the smaller the stitch length value during forward sewing, the smaller the stitch length of the sewing machine, the greater the stitch length value during reverse stitching Smaller, the larger the back stitch length of the sewing machine. Therefore, within the allowable stitch length range of the sewing machine, the driving source 110 controls the counterclockwise rotation and clockwise rotation of the driving cam 120 to quickly realize the stitch length adjustment, including the maximum stitch length (+5) from the positive stitching and the zero stitch length. The adjustment operation between the maximum stitch length (-5) and the zero stitch length of the reverse stitching, and the adjustment operation to adjust the stitch length close to zero.
  • the driving source 110 drives the driving cam 120 to rotate clockwise, and the reducing driving surface 121 on the driving cam 120 contacts the roller 82
  • the driving cam 120 drives the needle gauge base 41 to rotate counterclockwise around the first fixed swing fulcrum O1 through the first link 71 and the second link 72
  • the needle gauge base 41 drives the stop plate 73 to swing downward
  • the stop plate The limit part 731 on the 73 abuts and contacts with the limit damping block 77 on the fixed support 74.
  • the driving source 110 drives the driving cam 120 to continue to rotate clockwise, the first connecting part is driven by the driving torsion spring 76.
  • An included angle is formed between the rod 71 and the second link 72, the hinge point of the driving cam 120 and the first link 71, the hinge point of the first link 71 and the second link 72, and the second link 72 and the needle
  • the three points from the hinge point of the seat 41 are not collinear.
  • variable-diameter driving surface 121 on the driving cam 120 makes the driving plate 81 rotate clockwise about the first fixed swing fulcrum O1 through the ball, and the driving plate 81 makes the presser foot driving link 83 and the lower supply driving link 84 lower
  • the presser foot lifting driving link 83 pulls the presser foot lifting rod 62 to the right through the right lever 61, and drives the presser foot lifting plate 64 to move upward through the left lever 63, thereby driving the presser guide 65, the presser rod 66 and the presser foot 90 moves up together to realize the presser foot lifting;
  • the first sliding groove 841 at the lower end of the lower driving link 84 moves down relative to the first axial screw 150, until the upper end of the first sliding groove 841 and the first After the axial screw 150 abuts, as the lower feed driving link 84 continues to move down, the lower feed driving link 84 pushes the second lifting link 54 to swing through the first axial screw 150, and the second lifting link
  • the second tooth lifting connecting rod 54 drives the tooth lifting crank 55 to swing downward through the second axial screw 160, but the first lifting connecting rod 53 does not move under the action of the second chute 531.
  • the tooth-lifting crank 55 drives the tooth-lifting shaft 51 to swing together, and the tooth-lifting shaft 51 then drives the tooth frame 20 and the feeding tooth 30 to move down through the second tooth-lifting transmission unit to make the feeding tooth 30 drops below the upper surface of the needle plate 140, does not emerge from the tooth grooves of the needle plate 140, and realizes the downward feeding and unwinding action.
  • the pitch seat 41 remains stationary, and the driving source 110 and the pitch seat 41 between the movement separation. Further, when the sewing machine is lifting the presser foot and feeding and discharging, if the sewing machine is not at the maximum stitch length of the forward sewing, when the driving source 110 drives the driving cam 120 to rotate clockwise, the driving cam 120 will pass through the first connecting rod 71 first.
  • the second connecting rod 72 drives the stitch length base 41 to rotate counterclockwise, the stitch length value of the sewing machine gradually increases, and the limit part 731 on the stop plate 73 approaches the direction of the limit shock absorbing block 77 on the fixed support 74 Moving downwards, the first link 71 and the second link 72 are collinear, but there is no power transmission between the driving cam 120 and the roller 82, that is, the driving cam 120 and the presser foot mechanism 60, the driving cam 120 and the tooth lifting mechanism 50 are in a state of separation of motion. After that, the sewing machine crosses the maximum stitch length of the forward sewing.
  • the driving source 110 drives the driving cam 120 to continue to rotate clockwise, the contact surface on the limiting portion 731 abuts against the limiting shock-absorbing block 77, and a clamp is formed between the first connecting rod 71 and the second connecting rod 72 Angle, the driving cam 120 and the stitch base 41 are in a state of separation of motion, and the stitch base 41 does not rotate; but the driving cam 120 pushes the roller 82 upward, so that the driving cam 120 and the presser foot mechanism 60, the driving cam 120 and The tooth lifting mechanism 50 is in a state of kinematic engagement, and the feeding tooth 30 is automatically lowered below the upper surface of the needle plate 140 while lifting the presser foot.
  • the driving source 110 is reset, driving the driving cam 120 to rotate and reset counterclockwise, so that the first connecting rod 71 and the second connecting rod 72 are reset to a collinear state, the driving plate 81, the presser foot driving connecting rod 83.
  • the lower feed driving link 84 and the second lifting link 54 are all reset, so that the lifting crank 55, the lifting shaft 51, the bracket 20 and the feeding teeth 30 are reset.
  • the rotation of the driving cam 120 can be controlled by controlling the driving source 110, and the first transmission clutch mechanism 70 and the second transmission clutch mechanism 80 are combined to adjust the stitch length, dense stitch, forward stitch, reverse stitch, presser foot lifting and lower supply and release.
  • the roller 82 and the variable-diameter driving surface 121 on the driving cam 120 roll and cooperate with each other when the presser foot is lifted and the lower feeding and unloading, and there is no collision phenomenon, and there is no collision phenomenon when adjusting the needle distance. In order to avoid noise and crash problems.
  • a driving source 110 is adopted to realize the adjustment of stitch length, dense stitching, forward stitching, reverse stitching, presser foot lifting and lower feeding and unwinding, and only one reducing driving surface 121 is required to be processed on the driving cam 120, namely, the driving cam 120
  • the driving cam 120 There is only one cam function part, its structure is compact and simple, the accuracy of the mechanism and parts is easier to realize, the overall space is smaller, and the cost of the sewing machine can be greatly reduced.
  • the first transmission clutch mechanism 70 composed of the first connecting rod 71, the second connecting rod 72, the driving torsion spring 76, the stop plate 73, the fixed support 74 and the first spring 75, when the sewing machine is in the state of lifting the presser foot In the feeding and unloading state, the first connecting rod 71 and the second connecting rod 72 are in an angled state, no matter how the driving source 110 moves, the needle pitch seat 41 will remain stationary, realizing the driving source 110 and the needle pitch seat Separation of movement between 41.
  • the first link 71 and the second link 72 are in a collinear state, and the driving source 110 pulls the first link 71, the second link 72 and the needle upward through the driving cam 120.
  • the distance seat 41 overcomes the pulling force of the first spring 75 to realize the control of the position and angle of the needle distance seat 41 by the driving source 110, thereby realizing the control of the stitch length of the sewing machine.
  • the lower feed driving link 84 is provided with a first slide groove 841 which has the following functions: first, when the sewing machine is sewing normally, the drive plate 81 Does not move, but the second lifting link 54 moves with the lifting mechanism 50.
  • the first axial screw 150 slides on the first sliding groove 841, but does not hit the bottom of the first sliding groove 841, so that the mechanism Do not interfere with each other; second, play the role of idle stroke, sometimes it is necessary to raise the thread presser foot 90 a little during the sewing process to facilitate the rotation of the sewing material direction, but at this time, there is no need to lower the feeding thread 30, so a small amount of lifting is required
  • the first chute 841 of the lower driving link 84 moves down relative to the first axis screw 150 when the foot is underfoot, and the lower driving link 84 will not drive the tooth-lifting transmission component to move, only when the presser foot 90 is lifted to a higher height ,
  • the upper end of the first chute 841 can be abutted with the first axial screw 150, and then the downward feeding and unwinding action can be performed.
  • the present invention effectively overcomes various shortcomings in the prior art and has a high industrial value.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Sewing Machines And Sewing (AREA)

Abstract

一种缝纫机，包括主轴(10)、牙架(20)、安装在牙架(20)上的送料牙(30)、连接在主轴(10)和牙架(20)一端之间的送料机构(40)、连接在主轴(10)和牙架(20)另一端之间的抬牙机构(50)、压脚(90)、以及与压脚(90)相连的抬压脚机构(60)，送料机构(40)包括具有第一固定摆动支点(O1)的针距座(41)，还包括驱动源(110)、由驱动源(110)驱动转动的驱动凸轮(120)、第一传动离合机构(70)、以及第二传动离合机构(80)，第一传动离合机构(70)作用在驱动凸轮(120)和针距座(41)之间，第二传动离合机构(80)作用在驱动凸轮(120)、抬压脚机构(60)中的一抬压脚传动部件、以及抬牙机构(50)中的一抬牙传动部件之间；采用一个驱动源能够分别控制缝纫机的调针距、抬压脚、以及放料时送料牙(30)自动下降这三个功能，针距的调节同时还实现了缝纫机的正缝、倒缝和加密缝，大幅度降低成本，占据的空间更小。

Description

一种缝纫机
本申请要求于2019年9月24日提交中国专利局、申请号为201910906884.X、发明名称为“一种缝纫机”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本发明涉及一种缝纫机。
背景技术
缝纫机有平缝机、包缝机、绷缝机等机型，其用一根或多根缝纫线在缝料上形成一种或多种线迹，使一层或多层缝料交织或缝合起来。目前，电脑平缝机中配置有自动倒缝机构、自动加密缝机构和自动抬压脚机构，且各机构都是由电磁铁驱动，实现自动控制的功能。但是，正是由于采用电磁铁驱动，使得现有的缝纫机存在下述缺陷：1、电磁铁驱动自动倒缝机构时，需要调节器摆动撞击螺柱，以改变针距，但调节器和螺柱撞击时会发出噪声，影响用户使用体验；2、自动加密缝机构需要独立的电磁铁，且因为和其他倒缝、剪线等连续动作，从而造成电源电量不足，进而影响动作效果；3、自动抬压脚机构采用电磁铁驱动后，其声音较响，影响客户体验，且目前内置式自动抬压脚机构因空间限制而导致电磁铁体积做不大，进而使得电磁铁吸力不足，影响使用效果，且还缩短电磁铁的使用寿命。
进一步地，为了解决采用电磁铁所引起的一些不足，目前市场上推出了一些采用步进电机调针距和采用步进电机抬压脚的缝纫机，其采用一个步进电机、通过一套传动机构控制摆动座摆动实现针距调节，采用另一个步进电机、通过另一套传动机构驱动压脚抬起，故一个缝纫机中配置有两个步进电机及相应的控制装置，从而导致成本较高、占空间、发热较大，致使该技术难以大量推广。
进一步地，申请号为201510515041.9的中国发明专利公开了一种平缝机，其采用一个步进电机同时实现针距调节和自动抬压脚这两个功能，其 具有由步进电机驱动往复旋转的凸轮、作用于压杆的步进抬压曲柄、以及作用于送料轴的针距调节曲柄，凸轮上具有用于顶推步进抬压曲柄的步进抬压凸部和用于顶推针距调节曲柄的针距调节凸部。因此，该平缝机中配置的凸轮具有两个功能凸部，两个功能凸部沿凸轮的轴向错位设置，其加工难度大，尤其是调针距机构容易因凸轮加工偏差和安装精度偏差而造成针距调不准，且凸轮面传动相对常规的销孔配合易磨损，其也会造成针距偏差。
进一步地，现有平缝机中的机针和送料牙都是由主轴驱动的，机针和送料牙为同步连动关系。平缝机在缝纫开始之前，为了能保证正常地将缝料放入压脚下、针板上，平缝机中的机针和压脚都必须位于针板的上方，机针由操作工通过转动固定在主轴端部的手轮驱动运动，使机针运动至最高点；当机针位于针板上方运动至最高点(即上停针位)时，由于机针和送料牙之间的同步连动关系，送料牙也从针板的齿槽中向上冒出，即送料牙有一部分向上露出于针板，此时，送料牙会阻碍缝料放入，无法将缝料平整地放在针板上，尤其对于弹性薄料，进而影响缝纫质量，大大降低了缝纫体验。
发明内容
鉴于以上所述现有技术的缺点，本发明的目的在于提供一种缝纫机，由同一驱动源驱动调针距、抬压脚及送料牙下降。
为实现上述目的，本发明提供一种缝纫机，包括主轴、牙架、安装在牙架上的送料牙、连接在主轴和牙架一端之间的送料机构、连接在主轴和牙架另一端之间的抬牙机构、压脚、与压脚相连的抬压脚机构、驱动源、由驱动源驱动转动的驱动凸轮、第一传动离合机构、以及第二传动离合机构，所述送料机构包括具有第一固定摆动支点的针距座，所述第一传动离合机构作用在驱动凸轮和针距座之间，所述第二传动离合机构作用在驱动凸轮、抬压脚机构中的一抬压脚传动部件、以及抬牙机构中的一抬牙传动部件之间；
当所述第一传动离合机构使驱动凸轮和针距座之间有动力传递时，所 述第二传动离合机构使驱动凸轮和抬压脚传动部件之间、以及驱动凸轮和抬牙传动部件之间都无动力传递；此时，所述驱动源带动驱动凸轮转动，所述驱动凸轮通过第一传动离合机构驱动针距座绕第一固定摆动支点转动；
当所述第二传动离合机构使驱动凸轮和抬压脚传动部件之间、以及驱动凸轮和抬牙传动部件之间有动力传递时，所述第一传动离合机构使驱动凸轮和针距座之间无动力传递；此时，所述驱动源带动驱动凸轮转动，所述驱动凸轮通过第二传动离合机构驱动抬压脚机构动作、使压脚向上抬起，所述驱动凸轮通过第二传动离合机构同时驱动抬牙机构动作、使牙架和送料牙下降。
进一步地，所述驱动源为电机，所述驱动凸轮固定在电机的电机轴上。
进一步地，所述第一传动离合机构包括第一连杆、第二连杆、固定于针距座的止动板、固定于缝纫机机壳的固定支座、以及第一弹簧，所述第一连杆的两端分别与驱动凸轮和第二连杆铰接，所述第二连杆与针距座铰接，所述止动板上设有能够与固定支座抵接的限位部，所述第一弹簧的两端分别与止动板和固定支座相连、使止动板具有限位部向靠近固定支座方向运动的运动趋势；当第一连杆和第二连杆共线时，所述第一传动离合机构使驱动凸轮和针距座之间有动力传递，所述限位部与固定支座之间不抵接；当第一连杆和第二连杆不共线时，所述第一传动离合机构使驱动凸轮和针距座之间无动力传递，所述限位部与固定支座之间抵接。
进一步地，所述第一连杆和第二连杆的铰接处套设有驱动扭簧。
进一步地，所述限位部位于固定支座的上方。
进一步地，所述固定支座面向限位部的端面上固定有限位减震块，所述限位部上具有面向固定支座的接触面，所述接触面为一平直面、并能够与限位减震块抵接。
进一步地，所述送料机构包括平行于主轴的送料轴、连接在主轴和送料轴之间的第一送料传动单元、以及连接在送料轴和牙架之间的第二送料传动单元；所述第一送料传动单元包括固定在主轴上的送料偏心轮、送料连杆、第一摆动板、第二摆动板、固定在送料轴上的送料曲柄、以及所述 针距座，所述送料连杆的一端可转动地安装在送料偏心轮的外周，所述送料连杆的另一端、第一摆动板的一端、以及第二摆动板的一端同轴铰接，所述第一摆动板的另一端与针距座铰接，所述第二摆动板的另一端与送料曲柄铰接。
进一步地，所述第二传动离合机构包括具有第二固定摆动支点的驱动板、可转动地安装在驱动板一端的滚柱、抬压脚驱动连杆、以及下供驱动连杆，所述驱动板的另一端、抬压脚驱动连杆的一端、以及下供驱动连杆的一端同轴铰接，所述抬压脚驱动连杆的另一端与所述抬压脚传动部件相连，所述下供驱动连杆的另一端与所述抬牙传动部件相连，所述驱动凸轮的外周面上具有一段变径驱动面；当所述滚柱与驱动凸轮上的变径驱动面接触配合时，所述第二传动离合机构使驱动凸轮和抬压脚传动部件之间、以及驱动凸轮和抬牙传动部件之间都有动力传递；当所述滚柱与驱动凸轮上的变径驱动面不接触配合时，所述第二传动离合机构使驱动凸轮和抬压脚传动部件之间、以及驱动凸轮和抬牙传动部件之间无动力传递。
进一步地，所述驱动凸轮的外周面上具有凹槽部，所述凹槽部与变径驱动面相邻设置；当所述滚柱与驱动凸轮上的变径驱动面不接触配合时，所述滚柱位于凹槽部内、与驱动凸轮之间不接触。
进一步地，所述下供驱动连杆与抬牙传动部件通过一平行于主轴的第一轴位螺钉铰接，所述下供驱动连杆的下端开设有上下延伸的第一滑槽，所述第一轴位螺钉穿设在第一滑槽中、并能够与第一滑槽的上下两端抵接。
进一步地，所述抬牙机构包括平行于主轴的抬牙轴、连接在主轴和抬牙轴之间的第一抬牙传动单元、以及连接在抬牙轴和牙架之间的第二抬牙传动单元；所述第一抬牙传动单元包括固定在主轴上的抬牙偏心轮、第一抬牙连杆、第二抬牙连杆、以及固定在抬牙轴上的抬牙曲柄，所述第一抬牙连杆的一端可转动地安装在抬牙偏心轮的外周，所述第一抬牙连杆的另一端、第二抬牙连杆、以及抬牙曲柄同轴铰接，所述第二抬牙连杆还与第一抬牙连杆铰接，所述第二抬牙连杆还构成所述抬牙传动部件。
进一步地，所述第一抬牙连杆、第二抬牙连杆、以及抬牙曲柄三者通过一平行于主轴的第二轴位螺钉铰接，所述第一抬牙连杆的下端开设有上 下延伸的第二滑槽，所述第二轴位螺钉穿设在第二滑槽中；所述第一抬牙连杆与第二抬牙连杆还通过一平行于主轴的第三轴位螺钉铰接，所述第二抬牙连杆中开设有水平延伸的第三滑槽，所述第三轴位螺钉穿设在第三滑槽中。
进一步地，所述第二抬牙连杆呈凹形，包括上下延伸的杆体部、从杆体部的上端水平延伸出的上杆臂部、以及从杆体部的下端水平延伸出的下杆臂部，所述第二轴位螺钉穿设在杆体部与下杆臂部的相接处，所述第三滑槽开设在杆体部的上端、且背向上杆臂部的一侧。
进一步地，所述第一抬牙传动单元还包括第二弹簧，所述第二弹簧的两端分别与第一抬牙连杆和第二抬牙连杆相连、使第三轴位螺钉具有向靠近第三滑槽底部运动的运动趋势。
进一步地，所述抬压脚机构具有第三固定摆动支点的右杠杆、抬压脚拉杆、具有第四固定摆动支点的左杠杆、抬压脚提升板、压杆导架、以及上下延伸的压杆，所述右杠杆构成所述抬压脚传动部件，所述右杠杆的另一端与抬压脚拉杆的一端铰接，所述抬压脚拉杆的另一端与左杠杆的一端铰接，所述左杠杆的另一端与抬压脚提升板的上端相铰接，所述抬压脚提升板上设有提升钩部，所述压杆导架上设有与提升钩部相卡合的连接突部，所述压杆导架固定在压杆的上端，所述压脚安装在压杆的下端。
如上所述，本发明涉及的缝纫机，具有以下有益效果：
本申请采用一个驱动源能够分别控制缝纫机的调针距、抬压脚、以及放料时送料牙自动下降这三个功能，针距的调节同时还实现了缝纫机的正缝、倒缝和加密缝，相对于现有技术采用一个驱动源控制缝纫机的一个或两个功能而言，本申请能够大幅度降低成本，且结构更紧凑，占据的空间更小，有利于技术的推广应用。
附图说明
图1为本申请中缝纫机的结构示意图。
图2为图1在另一视角下的结构示意图，且省略了图1中的机壳和驱动源。
图3为图1在又一视角下的结构示意图，且省略了图1中的机壳。
图4为本申请中驱动凸轮、第一传动离合机构、以及针距座之间的连接示意图。
图5为本申请中驱动凸轮、第二传动离合机构、以及第二抬牙连杆之间的连接示意图。
图6为本申请中第一抬牙传动单元的结构示意图。
图7为本申请中第一抬牙连杆的结构示意图。
图8为本申请中第二抬牙连杆的结构示意图。
图9为本申请中缝纫机在调针距时的状态图。
图10为本申请中缝纫机在抬压脚时的状态图。
图11为本申请中缝纫机在下供放料时的状态图。
元件标号说明
10                 主轴
20                 牙架
30                 送料牙
40                 送料机构
41                 针距座
42                 送料轴
43                 送料偏心轮
44                 送料连杆
45                 第一摆动板
46                 第二摆动板
47                 送料曲柄
48                 第一支撑销
49                 牙架座
50                 抬牙机构
51                 抬牙轴
52                 抬牙偏心轮
53                 第一抬牙连杆
531                第二滑槽
54                 第二抬牙连杆
541                杆体部
542                上杆臂部
543                下杆臂部
544                第三滑槽
55                 抬牙曲柄
56                 第二弹簧
57                 抬牙叉
58                 抬牙滑块
59                 弹簧挂销
60                 抬压脚机构
61                 右杠杆
62                 抬压脚拉杆
63                 左杠杆
64                 抬压脚提升板
65                 压杆导架
66                 压杆
70                 第一传动离合机构
71                 第一连杆
72                 第二连杆
73                 止动板
731                限位部
74                 固定支座
75                 第一弹簧
76                 驱动扭簧
77                 限位减震块
80                 第二传动离合机构
81                  驱动板
82                  滚柱
83                  抬压脚驱动连杆
84                  下供驱动连杆
841                 第一滑槽
85                  第二支撑销
90                  压脚
110                 驱动源
120                 驱动凸轮
121                 变径驱动面
122                 凹槽部
130                 机壳
140                 针板
150                 第一轴位螺钉
160                 第二轴位螺钉
170                 第三轴位螺钉
具体实施方式
以下由特定的具体实施例说明本发明的实施方式，熟悉此技术的人士可由本说明书所揭露的内容轻易地了解本发明的其他优点及功效。
须知，本说明书附图所绘的结构、比例、大小等，均仅用以配合说明书所揭示的内容，以供熟悉此技术的人士了解与阅读，并非用以限定本发明可实施的限定条件，故不具技术上的实质意义，任何结构的修饰、比例关系的改变或大小的调整，在不影响本发明所能产生的功效及所能达成的目的下，均应仍落在本发明所揭示的技术内容能涵盖的范围内。同时，本说明书中所引用的如“上”、“下”、“左”、“右”、“中间”及“一”等的用语，亦仅为便于叙述明了，而非用以限定本发明可实施的范围，其相对关系的改 变或调整，在无实质变更技术内容下，当亦视为本发明可实施的范畴。
本申请提供一种缝纫机，如图1至图3所示，缝纫机包括机壳130、可转动地安装在机壳130内的主轴10、以及安装于机壳130且驱动主轴10转动的主电机。为便于叙述，将主轴10的轴向定义为左右方向，且主轴10朝向缝纫机机头的方向为左方向、即图3视图中主轴10朝向纸面左侧的方向，主轴10朝向缝纫机机尾的方向为右方向、即图3视图中主轴10朝向纸面右侧的方向；将缝纫机正缝时缝料的移动方向定义为前方向。
如图1至图3所示，缝纫机还包括牙架20、固定安装在牙架20上的送料牙30、连接在主轴10和牙架20前端之间的送料机构40、连接在主轴10和牙架20后端之间的抬牙机构50、压脚90、与压脚90相连的抬压脚机构60、驱动源110、由驱动源110驱动转动的驱动凸轮120、第一传动离合机构70、以及第二传动离合机构80，送料机构40包括具有第一固定摆动支点O1的针距座41；第一传动离合机构70作用在驱动凸轮120和针距座41之间，用于实现驱动凸轮120和针距座41之间有无动力传递；第二传动离合机构80作用在驱动凸轮120、抬压脚机构60中的一抬压脚传动部件、以及抬牙机构50中的一抬牙传动部件之间，用于实现驱动凸轮120和抬压脚传动部件之间有无动力传递、以及驱动凸轮120和抬牙传动部件之间有无动力传递。
缝纫机在正常缝纫时，驱动源110不动作，驱动凸轮120处于静止状态，主电机驱动主轴10转动，主轴10通过送料机构40驱动牙架20和送料牙30一起前后往复运动，主轴10通过抬牙机构50驱动牙架20和送料牙30一起上下往复运动，故送料牙30做前后往复运动和上下往复运动的周期性复合运动，送料牙30的运动轨迹为椭圆形。如图3所示，缝纫机中的针板140上开设有多道前后延伸的齿槽，送料牙30能够在齿槽中向上冒出、露出于针板140的上表面，牙架20位于针板140的下方。缝纫机需要调针距时，第一传动离合机构70使驱动凸轮120和针距座41之间有动力传递，但第二传动离合机构80使驱动凸轮120和抬压脚传动部件之间、以及驱动凸轮120和抬牙传动部件之间都无动力传递；此时，驱动源110带动驱动凸轮120转动，驱动凸轮120通过第一传动离合机构70驱动针距座 41绕第一固定摆动支点O1转动，可改变主轴10通过送料机构40驱动牙架20和送料牙30前后往复运动的运动幅度，实现针距调节；并且，通过针距的改变，同时还实现了缝纫机的正缝、倒缝和加密缝的功能。缝纫机需要抬压脚时，第二传动离合机构80使驱动凸轮120和抬压脚传动部件之间、以及驱动凸轮120和抬牙传动部件之间都有动力传递时，但第一传动离合机构70使驱动凸轮120和针距座41之间无动力传递；此时，驱动源110带动驱动凸轮120转动，驱动凸轮120通过第二传动离合机构80驱动抬压脚机构60动作、使压脚90向上抬起，驱动凸轮120通过第二传动离合机构80同时还驱动抬牙机构50动作、使牙架20和送料牙30下降，实现在抬压脚的同时送料牙30自动下移至针板140上表面的下方，执行下供放料动作，便于将缝料放入针板140和压脚90之间、或便于将针板140和压脚90之间的缝料取走。
因此，本申请采用一个驱动源110能够分别控制缝纫机的调针距、抬压脚、以及放料时送料牙30自动下降(即下供放料)这三个功能，针距的调节同时还实现了缝纫机正缝、倒缝和加密缝之间的切换。特别地，本申请通过第一传动离合机构70和第二传动离合机构80实现驱动源110控制缝纫机调针距时缝纫机不执行抬压脚和送料牙30自动下降的动作、以及驱动源110控制缝纫机抬压脚和送料牙30自动下降时缝纫机不执行调针距的动作(即驱动源110控制缝纫机抬压脚和送料牙30自动下降后再复位时，缝纫机的针距未发生变化)。本申请相对于现有技术采用一个驱动源110控制缝纫机的一个或两个功能而言，本申请能够大幅度降低成本，且结构更紧凑，占据的空间更小，有利于技术的推广应用。
优选地，如图1和图3所示，驱动源110为电机、固定安装于机壳130，本实施例中选用步进电机；驱动凸轮120固定在电机的电机轴上，电机直接带动驱动凸轮120转动。
送料机构40的优选结构为：如图2至图4所示，送料机构40包括平行于主轴10的送料轴42、连接在主轴10和送料轴42右端之间的第一送料传动单元、以及连接在送料轴42左端和牙架20前端之间的第二送料传动单元，送料轴42可转动地安装在缝纫机机壳130中。其中，第一送料传 动单元包括固定在主轴10上的送料偏心轮43、送料连杆44、第一摆动板45、第二摆动板46、固定在送料轴42右端的送料曲柄47、以及针距座41，送料连杆44的上端可转动地安装在送料偏心轮43的外周，送料连杆44的下端、第一摆动板45的后端、以及第二摆动板46的后端通过一左右延伸的轴位销同轴铰接，第一摆动板45的前端与针距座41通过一左右延伸的轴位销铰接，第二摆动板46的前端与送料曲柄47通过一左右延伸的轴位销铰接。针距座41的左右两侧分别可转动地安装于左右延伸的第一支撑销48，第一支撑销48固定在机壳130中，第一支撑销48构成针距座41的第一固定摆动支点O1，针距座41能够绕第一支撑销48转动。第二送料传动单元包括固定在送料轴42左端的牙架座49，牙架座49与牙架20的前端相连。主轴10通过第一送料传动单元驱动送料轴42摆动，送料轴42通过第二送料传动单元驱动牙架20前后往复运动，第一送料传动单元中针距座41的位置角度直接决定主轴10与送料轴42之间的传动效率，故可通过改变针距座41的位置角度来改变主轴10带动送料轴42摆动的摆幅，从而改变牙架20和送料牙30前后往复运动的运动幅度，实现针距调节、以及正缝、倒缝和加密缝之间的切换。
第一传动离合机构70的优选结构为：如图2和图4所示，第一传动离合机构70包括第一连杆71、第二连杆72、固定在针距座41后端的止动板73、固定于缝纫机机壳130的固定支座74、以及第一弹簧75；第一连杆71的上端与驱动凸轮120之间、第一连杆71的下端与第二连杆72的上端之间、以及第二连杆72的下端与针距座41之间分别通过左右延伸的轴位销铰接，且第二连杆72与针距座41的铰接点位于第一固定摆动支点O1的后方侧；止动板73后侧的上端设有限位部731，该限位部731位于固定支座74后段部分的上方、并能够与固定支座74抵接；第一弹簧75的前端与固定支座74的前段部分相连，第一弹簧75的后端与止动板73后侧的下端相连，第一弹簧75对止动板73施加斜向下的拉力，使止动板73保持向第一弹簧75拉力方向转动的趋势；因此，在第一弹簧75拉力的作用下，止动板73和针距座41具有绕第一支撑销48向下转动的趋势，也即止动板73和针距座41具有止动板73上限位部731向靠近固定支座74方向向下 转动的运动趋势。
上述第一传动离合机构70中，当第一连杆71和第二连杆72共线时，即驱动凸轮120与第一连杆71的铰接点、第一连杆71与第二连杆72的铰接点、以及第二连杆72与针距座41的铰接点三点共线时，第一连杆71和第二连杆72等同于一根连杆，第一传动离合机构70使驱动凸轮120和针距座41之间有动力传递，实现驱动凸轮120与针距座41之间运动的接合，也即实现驱动源110和针距座41之间运动的接合；限位部731与固定支座74之间处于不抵接、不接触的状态；此时，驱动源110带动驱动凸轮120转动时，驱动凸轮120通过第一连杆71和第二连杆72驱动针距座41绕其第一固定摆动支点O1转动，能够改变针距座41的位置角度。当第一连杆71和第二连杆72不共线时，即驱动凸轮120与第一连杆71的铰接点、第一连杆71与第二连杆72的铰接点、以及第二连杆72与针距座41的铰接点三点不共线时，第一传动离合机构70使驱动凸轮120和针距座41之间无动力传递，实现驱动凸轮120与针距座41之间运动的分离，也即实现驱动源110和针距座41之间运动的分离；同时，限位部731与固定支座74之间处于抵接的状态；此时，驱动源110带动驱动凸轮120转动时，不论驱动凸轮120如何转动，驱动凸轮120通过第一连杆71和第二连杆72都不会驱动针距座41转动，即针距座41保持不动。
进一步地，当限位部731与固定支座74从抵接、接触的状态变化为脱离状态时，缝纫机位于正缝最大针距处，即缝纫机此时具有最大正值针距；缝纫机在调针距过程中，驱动凸轮120与第一连杆71的铰接点、第一连杆71与第二连杆72的铰接点、以及第二连杆72与针距座41的铰接点三点始终共线，驱动凸轮120和针距座41之间始终有动力传递；并且，驱动源110带动驱动凸轮120转动时，驱动凸轮120通过第一连杆71和第二连杆72驱动针距座41和止动板73向上摆动，使限位部731进一步远离固定支座74；故驱动凸轮120与第一连杆71的铰接点、第一连杆71与第二连杆72的铰接点、以及第二连杆72与针距座41的铰接点三点仍然共线；或者说，在缝纫机允许的机针范围内，驱动凸轮120与第一连杆71的铰接点、第一连杆71与第二连杆72的铰接点、以及第二连杆72与针距座41的铰 接点三点始终共线。而缝纫机在抬压脚和下供送料时，驱动源110带动驱动凸轮120转动，驱动凸轮120通过第一连杆71和第二连杆72驱动针距座41和止动板73向下摆动，使限位部731靠近固定支座74，缝纫机的针距值逐渐增大，限位部731逐渐靠近固定支座74；当限位部731与固定支座74抵接后，随着驱动凸轮120的继续转动，缝纫机越过最大正值针距，并且驱动凸轮120与第一连杆71的铰接点、第一连杆71与第二连杆72的铰接点、以及第二连杆72与针距座41的铰接点这三点由三点共线的状态变化为三点不共线的状态，相应地使第一连杆71和第二连杆72由共线状态变化为夹角状态；在抬压脚和下供送料结束后，压脚90、送料牙30、驱动凸轮120、针距座41和止动板73都会复位，限位部731与固定支座74由接触状态复位至脱离状态，第一连杆71和第二连杆72由夹角状态复位至共线状态，缝纫机恢复抬压脚和下供送料前的当前针距。
优选地，如图2和图4所示，止动板73和固定支座74上都设有与第一弹簧75相连的挂钩部。第一连杆71和第二连杆72的铰接处套设有驱动扭簧76，驱动扭簧76的两端分别与第一连杆71和第二连杆72相连，驱动扭簧76使第一连杆71和第二连杆72之间保持不共线弯转的趋势，进而在抬压脚和下供送料时，第一连杆71和第二连杆72由共线状态变化为夹角状态时给予弯转方向。固定支座74面向限位部731的上端面上固定有限位减震块77，限位部731的下端面为面向固定支座74的接触面，接触面为一平直面、并能够与限位减震块77抵接；故限位部731的接触面与固定支座74从脱离状态变化为抵接状态时，限位部731上的接触面撞击在限位减震块77上，限位减震块77起到缓冲作用、并能够减少因撞击而产生的噪声。
第二传动离合机构80的优选结构为：如图2和图5所示，第二传动离合机构80包括具有第二固定摆动支点O2的驱动板81、可转动地安装在驱动板81后端的滚柱82、抬压脚驱动连杆83、以及下供驱动连杆84，驱动板81的前端、抬压脚驱动连杆83的下端、以及下供驱动连杆84的上端通过一前后延伸的轴位销同轴铰接，抬压脚驱动连杆83的上端与抬压脚机构60中的抬压脚传动部件相连，下供驱动连杆84的下端与抬牙机构50中的 抬牙传动部件相连，驱动凸轮120的外周面上具有一段变径驱动面121。缝纫机在正常缝纫过程中、以及缝纫机在调整过程中，滚柱82与驱动凸轮120上的变径驱动面121不接触配合，此时，滚柱82与驱动凸轮120之间无动力传递，故第二传动离合机构80使驱动凸轮120和抬压脚传动部件之间、以及驱动凸轮120和抬牙传动部件之间都无动力传递，实现驱动凸轮120和抬压脚传动部件之间、以及驱动凸轮120和抬牙传动部件之间运动的分离，也即实现驱动源110和抬压脚机构60之间、以及驱动源110和抬牙机构50之间运动的分离。缝纫机在抬压脚和下供放料时，滚柱82与驱动凸轮120上的变径驱动面121接触配合，此时，滚柱82与驱动凸轮120之间有动力传递，驱动凸轮120通过变径驱动面121推动滚柱82，通过滚柱82使驱动板81绕第二固定摆动支点O2转动，驱动板81会通过抬压脚驱动连杆83驱动抬压脚传动部件动作，驱动板81同时还会通过下供驱动连杆84驱动抬牙传动部件动作，故第二传动离合机构80使驱动凸轮120和抬压脚传动部件之间、以及驱动凸轮120和抬牙传动部件之间都有动力传递，实现驱动凸轮120和抬压脚传动部件之间、以及驱动凸轮120和抬牙传动部件之间运动的接合，也即实现驱动源110和抬压脚机构60之间、以及驱动源110和抬牙机构50之间运动的接合。
优选地，滚柱82与驱动凸轮120上的变径驱动面121不接触配合时滚柱82与驱动凸轮120无动力传递的实现方式可以为：方式一、如图5所示，驱动凸轮120的外周面上具有凹槽部122，凹槽部122与变径驱动面121相邻设置；当驱动源110带动驱动凸轮120转动，使驱动凸轮120上的凹槽部122转动至滚柱82下方时，滚柱82位于凹槽部122内，但滚柱82与驱动凸轮120的外周面之间不接触、两者处于脱离的状态，由此实现滚柱82与驱动凸轮120上的变径驱动面121不接触配合时滚柱82与驱动凸轮120之间无动力传递。方式二、在驱动凸轮120的外周面上设置相邻于变径驱动面121的等径驱动面；当驱动源110带动驱动凸轮120转动，使驱动凸轮120上的等径驱动面转动至滚柱82下方时，滚柱82与等径驱动面接触配合，由此实现滚柱82与驱动凸轮120上的变径驱动面121不接触配合时滚柱82与驱动凸轮120之间无动力传递。
进一步地，如图5所示，驱动板81的右端面可转动地安装于一左右延伸的第二支撑销85，第二支撑销85固定在机壳130中，第二支撑销85构成驱动板81的第二固定摆动支点O2，驱动板81能够绕第二支撑销85转动。另外，由于抬压脚行程和下供送料行程之间的区别，在抬压脚时需要下供驱动连杆84与抬牙传动部件之间先具有一段空行程；基于此，如图5所示，下供驱动连杆84与抬牙传动部件通过一平行于主轴10的第一轴位螺钉150铰接，下供驱动连杆84的下端开设有上下延伸的第一滑槽841，第一轴位螺钉150穿设在第一滑槽841中、两者滑动配合，且第一轴位螺钉150能够与第一滑槽841的上下两端抵接。未抬压脚时，第一轴位位于第一滑槽841的下端处；开始抬压脚时，驱动板81带动抬压脚驱动连杆83和下供驱动连杆84下移，抬压脚传动部件开始动作、开始抬压脚，但下供驱动连杆84的第一滑槽841相对于第一轴位螺钉150下移，故下供驱动连杆84不会带动抬牙传动部件动作；当第一滑槽841的上端与第一轴位螺钉150抵接后，下供驱动连杆84才会驱动抬牙传动部件动作、开始下供放料。
抬牙机构50的优选结构为：如图2和图3、以及图5和图6所示，抬牙机构50包括平行于主轴10的抬牙轴51、连接在主轴10和抬牙轴51右端之间的第一抬牙传动单元、以及连接在抬牙轴51左端和牙架20后端之间的第二抬牙传动单元，抬牙轴51可转动地安装在缝纫机机壳130中。其中，第一抬牙传动单元包括固定在主轴10上的抬牙偏心轮52、第一抬牙连杆53、第二抬牙连杆54、以及固定在抬牙轴51上的抬牙曲柄55，第一抬牙连杆53的上端可转动地安装在抬牙偏心轮52的外周，第一抬牙连杆53的下端、第二抬牙连杆54的下端、以及抬牙曲柄55通过一左右延伸的第二轴位螺钉160同轴铰接，第二抬牙连杆54的上端还与第一抬牙连杆53的中间部分通过一左右延伸的第三轴位螺钉170铰接，第二抬牙连杆54还构成抬牙传动部件、与第二传动离合机构80相连，即下供驱动连杆84的下端与第二抬牙连杆54通过上述第一轴位螺钉150铰接。第二抬牙传动单元包括固定在抬牙轴51左端的抬牙叉57、开设在抬牙叉57中的抬牙滑槽、以及与抬牙滑槽滑动配合的抬牙滑块58，抬牙滑块58和牙架20的后 端通过一左右延伸的轴位销铰接。
进一步地，如图6至图8所示，第一抬牙连杆53的下端开设有上下延伸的第二滑槽531，同轴铰接第一抬牙连杆53、第二抬牙连杆54和抬牙曲柄55的第二轴位螺钉160穿设在第二滑槽531中、两者滑动配合；第二抬牙连杆54中开设有水平延伸的第三滑槽544，铰接第一抬牙连杆53和第二抬牙连杆54的第三轴位螺钉170穿设在第三滑槽544中，实现下供放料时第一抬牙连杆53不干涉第二抬牙连杆54的运动。优选地，第二抬牙连杆54呈凹形，包括上下延伸的杆体部541、从杆体部541的上端水平向前延伸出的上杆臂部542、以及从杆体部541的下端水平向前延伸出的下杆臂部543，第二轴位螺钉160穿设在杆体部541与下杆臂部543的相接处，第三滑槽544开设在杆体部541的上端、且背向上杆臂部542的一侧，第三滑槽544为一开口朝后的U形槽。另外，第一抬牙传动单元还包括第二弹簧56，第一抬牙连杆53的中间段上、以及第二抬牙连杆54中上杆臂部542的前端都固定有弹簧挂销59，第二弹簧56的后端与第一抬牙连杆53上的弹簧挂销59相连，第二弹簧56的前端与第二抬牙连杆54中上杆臂部542上的弹簧挂销59相连，从而使第二弹簧56连接在第一抬牙连杆53和第二抬牙连杆54之间；在第二弹簧56的拉力作用下，第一抬牙连杆53和第三轴位螺钉170具有向前运动的运动趋势，进而使第三轴位螺钉170具有向靠近第三滑槽544底部向前运动的运动趋势，将第三轴位螺钉170保持在第三滑槽544的底部。
抬压脚机构60的优选结构为：如图2和图3、以及图10所示，抬压脚机构60具有第三固定摆动支点O3的右杠杆61、抬压脚拉杆62、具有第四固定摆动支点O4的左杠杆63、抬压脚提升板64、压杆导架65、以及上下延伸的压杆66；其中，右杠杆61和左杠杆63都通过前后延伸的轴位销铰接于机壳130；右杠杆61构成抬压脚传动部件、与第二传动离合机构80相连，即抬压脚驱动连杆83的上端与右杠杆61的右端铰接；右杠杆61的左端与抬压脚拉杆62的右端铰接，抬压脚拉杆62的左端与左杠杆63的右上铰接，左杠杆63的左下端与抬压脚提升板64的上端相铰接，抬压脚提升板64上设有提升钩部，压杆导架65上设有与提升钩部相卡合的连 接突部，压杆导架65固定在压杆66的上端，压脚90安装在压杆66的下端，压脚90位于针板140的上方。
进一步地，本申请涉及的缝纫机中，送料偏心轮43和抬牙偏心轮52可以为两个相互独立的偏心轮、也可以合为一个偏心轮，当送料偏心轮43和抬牙偏心轮52合为一个偏心轮时，该偏心轮上具有与送料连杆44相连的送料偏心部、以及与第一抬牙连杆53相连的抬牙偏心部。
以驱动凸轮120上具有凹槽部122为例，具有上述结构的缝纫机的工作原理如下：
缝纫机的针距具有负值和正值，缝纫机的针距为负值时，缝纫机处于倒缝模式，针距值越小、倒缝针距越大；缝纫机的针距为0或接近与0时，缝纫机处于加密缝模式；缝纫机的针距为正值时，缝纫机处于正缝模式，针距值越大、正缝针距越大。缝纫机位于正缝最大针距处时，止动板73上的限位部731与固定支座74上的限位减震块77恰好脱离、两者不抵接。缝纫机在其允许的针距范围内时，止动板73上的限位部731与固定支座74上的限位减震块77始终是脱离状态，驱动凸轮120与第一连杆71的铰接点、第一连杆71与第二连杆72的铰接点、以及第二连杆72与针距座41的铰接点这三点始终共线。
图9至图11所示的视图中，此时缝纫机恰巧位于正缝最大针距处。
缝纫机针距调节时，从图9所示的视图角度看，驱动源110带动驱动凸轮120逆时针转动，驱动凸轮120上的凹槽部122位于滚柱82的下方，故驱动凸轮120与滚柱82之间不接触、悬空，滚柱82和驱动板81保持不动，驱动凸轮120和抬压脚传动部件之间、以及驱动凸轮120和抬牙传动部件之间无动力传递，故抬压脚机构60和抬牙机构50不动作；与此同时，驱动凸轮120通过第一连杆71和第二连杆72驱动针距座41绕第一固定摆动支点O1顺时针转动，改变针距座41的位置角度，针距座41的位置角度直接控制送料曲柄47和送料轴42的摆幅，也即控制牙架20和送料牙30在前后方向上的运动幅度，以此来控制缝纫机的针距。针距座41带动止动板73一起绕第一固定摆动支点O1顺时针转动，克服第一弹簧75的拉力，止动板73上的限位部731向上移动、进一步远离固定支座74上的 限位减震块77。调节到需要的针距值后，驱动源110停止动作，驱动凸轮120保持在当前位置，通过第一连杆71和第二连杆72使针距座41静止，缝纫机保持调节后的针距值。随着图9视图中针距座41的顺时针转动，缝纫机的针距值从正缝最大针距逐渐减小，经过加密缝模式下的零针距，之后再进入倒缝模式下的负值针距，直至减小到倒缝最大针距；在此过程中，针距值是逐渐减小的，正缝时针距值越小、缝纫机的正缝针距越小，倒缝时针距值越小、缝纫机的倒缝针距越大。因此，在缝纫机允许的针距范围内，驱动源110控制驱动凸轮120的逆时针转动和顺时针转动即可快速实现针距调节，包括从正缝最大针距(+5)与零针距之间的调整操作、倒缝最大针距(-5)与零针距之间的调整操作、以及调节至接近零针距的调整操作。并且，在缝纫机允许的针距范围内调节针距的过程中，在驱动源110和第一弹簧75相互拉动的作用下，第一连杆71和第二连杆72的铰接处套设的驱动扭簧76的力被克服，使驱动凸轮120与第一连杆71的铰接点、第一连杆71与第二连杆72的铰接点、以及第二连杆72与针距座41的铰接点这三点始终共线。
缝纫机抬压脚和下供放料时，从图10和图11所示的视图角度看，驱动源110带动驱动凸轮120顺时针转动，驱动凸轮120上的变径驱动面121与滚柱82接触配合，并且驱动凸轮120通过第一连杆71和第二连杆72驱动针距座41绕第一固定摆动支点O1逆时针转动，针距座41带动止动板73向下摆动，止动板73上的限位部731与固定支座74上的限位减震块77抵接、接触，随着驱动源110带动驱动凸轮120继续顺时针转动，在驱动扭簧76的作用下第一连杆71和第二连杆72之间形成夹角，驱动凸轮120与第一连杆71的铰接点、第一连杆71与第二连杆72的铰接点、以及第二连杆72与针距座41的铰接点这三点不共线。与此同时，驱动凸轮120上的变径驱动面121通过滚珠使驱动板81绕第一固定摆动支点O1顺时针转动，驱动板81使抬压脚驱动连杆83和下供驱动连杆84下移，抬压脚驱动连杆83通过右杠杆61向右拉动抬压脚拉杆62，通过左杠杆63驱动抬压脚提升板64上移，进而带动压杆导架65、压杆66和压脚90一起上移，实现抬压脚；与此同时，下供驱动连杆84下端的的第一滑槽841相对于第 一轴位螺钉150下移，待第一滑槽841的上端与第一轴位螺钉150抵接后，随着下供驱动连杆84的继续下移，下供驱动连杆84通过第一轴位螺钉150推动第二抬牙连杆54摆动，第二抬牙连杆54中第三滑槽544的底部相对于穿设在第一抬牙连杆53中的第三轴位螺钉170运动，使第三滑槽544的后端开口角度朝上，也即使第二抬牙连杆54绕第二轴位螺钉160顺时针摆动时呈向下移动，第二抬牙连杆54通过第二轴位螺钉160带动抬牙曲柄55向下摆动，但第一抬牙连杆53在第二滑槽531的作用不运动，抬牙曲柄55带动抬牙轴51一起摆动，抬牙轴51再通过第二抬牙传动单元驱动牙架20和送料牙30下移，使送料牙30下降至针板140的上表面以下、不从针板140的齿槽中冒出，实现下供放料动作。另外，由于第一连杆71和第二连杆72之间形成夹角，使得驱动凸轮120和针距座41之间无动力传递，针距座41保持不动，驱动源110和针距座41之间的运动分离。进一步地，缝纫机抬压脚和下供放料时，若缝纫机不位于正缝最大针距处，则当驱动源110带动驱动凸轮120顺时针转动时，驱动凸轮120会先通过第一连杆71和第二连杆72带动针距座41逆时针转动，缝纫机的针距值逐渐增大，止动板73上的限位部731向靠近固定支座74上的限位减震块77的方向向下运动，第一连杆71和第二连杆72共线，但驱动凸轮120和滚柱82之间无动力传递，即驱动凸轮120和抬压脚机构60、驱动凸轮120和抬牙机构50都处于运动分离的状态。之后，缝纫机会越过正缝最大针距。再之后，随着驱动源110带动驱动凸轮120继续顺时针转动，限位部731上的接触面与限位减震块77抵接，第一连杆71和第二连杆72之间形成夹角，驱动凸轮120和针距座41之间处于运动分离的状态，针距座41不转动；但驱动凸轮120向上推动滚柱82，使驱动凸轮120和抬压脚机构60、驱动凸轮120和抬牙机构50都处于运动接合的状态，在抬压脚的同时还将送料牙30自动下降至针板140的上表面以下。待放料结束后，驱动源110复位，带动驱动凸轮120逆时针转动、复位，从而使得第一连杆71和第二连杆72复位至共线状态，驱动板81、抬压脚驱动连杆83、下供驱动连杆84、第二抬牙连杆54都复位，使抬牙曲柄55、抬牙轴51、牙架20和送料牙30复位。
综上所述，本申请涉及的缝纫机具有下述优点：
1、通过控制驱动源110可控制驱动凸轮120的转动，结合第一传动离合机构70和第二传动离合机构80进行调针距、加密缝、正缝、倒缝、抬压脚和下供放料，并可适时进行互相切换，抬压脚和下供放料时滚柱82与驱动凸轮120上的变径驱动面121之间滚动配合、无撞击现象，调针距时也无撞击现象，进而规避噪音和撞坏的问题。
2、采用一个驱动源110实现调针距、加密缝、正缝、倒缝、抬压脚和下供放料，且驱动凸轮120上只需加工出一个变径驱动面121，即驱动凸轮120上仅有一个凸轮功能部件，其结构紧凑、简单，机构和零件的精度更加容易实现，整体占据的空间更小，并且能大幅度降低缝纫机的成本。
3、由第一连杆71、第二连杆72、驱动扭簧76、止动板73、固定支座74和第一弹簧75组成的第一传动离合机构70，在缝纫机处于抬压脚状态和下供取料状态时，第一连杆71和第二连杆72之间处于夹角状态，驱动源110不论如何动作，针距座41都会保持不动，实现驱动源110和针距座41之间运动的分离。在缝纫机处于压脚90放下状态时，第一连杆71和第二连杆72之间处于共线状态，驱动源110通过驱动凸轮120向上拉动第一连杆71、第二连杆72和针距座41，克服第一弹簧75的拉力，实现驱动源110对针距座41位置角度的控制，由此实现对缝纫机针距的控制。
4、下供驱动连杆84与第二抬牙连杆54的相接处在下供驱动连杆84上设置第一滑槽841具有下述作用：第一、缝纫机在正常缝纫时，驱动板81不运动，但第二抬牙连杆54随抬牙机构50运动，此过程中第一轴位螺钉150在第一滑槽841上滑动、但不撞击第一滑槽841的槽底，使机构之间不相互干涉；第二、起到空行程的作用，有时需要在缝纫过程中少量抬牙压脚90便于转动缝料方向，但此时是不需要送料牙30下降的，则少量抬压脚时下供驱动连杆84的第一滑槽841相对于第一轴位螺钉150下移，下供驱动连杆84不会带动抬牙传动部件动作，只有在压脚90抬起高度较高时，能使第一滑槽841的上端与第一轴位螺钉150抵接，才执行下供放料的动作。
所以，本发明有效克服了现有技术中的种种缺点而具高度产业利用价 值。
上述实施例仅例示性说明本发明的原理及其功效，而非用于限制本发明。任何熟悉此技术的人士皆可在不违背本发明的精神及范畴下，对上述实施例进行修饰或改变。因此，举凡所属技术领域中具有通常知识者在未脱离本发明所揭示的精神与技术思想下所完成的一切等效修饰或改变，仍应由本发明的权利要求所涵盖。

Claims (15)

  1. 一种缝纫机，包括主轴(10)、牙架(20)、安装在牙架(20)上的送料牙(30)、连接在主轴(10)和牙架(20)一端之间的送料机构(40)、连接在主轴(10)和牙架(20)另一端之间的抬牙机构(50)、压脚(90)、以及与压脚(90)相连的抬压脚机构(60)，所述送料机构(40)包括具有第一固定摆动支点(O1)的针距座(41)，其特征在于：还包括驱动源(110)、由驱动源(110)驱动转动的驱动凸轮(120)、第一传动离合机构(70)、以及第二传动离合机构(80)，所述第一传动离合机构(70)作用在驱动凸轮(120)和针距座(41)之间，所述第二传动离合机构(80)作用在驱动凸轮(120)、抬压脚机构(60)中的一抬压脚传动部件、以及抬牙机构(50)中的一抬牙传动部件之间；
    当所述第一传动离合机构(70)使驱动凸轮(120)和针距座(41)之间有动力传递时，所述第二传动离合机构(80)使驱动凸轮(120)和抬压脚传动部件之间、以及驱动凸轮(120)和抬牙传动部件之间都无动力传递；此时，所述驱动源(110)带动驱动凸轮(120)转动，所述驱动凸轮(120)通过第一传动离合机构(70)驱动针距座(41)绕第一固定摆动支点(O1)转动；
    当所述第二传动离合机构(80)使驱动凸轮(120)和抬压脚传动部件之间、以及驱动凸轮(120)和抬牙传动部件之间有动力传递时，所述第一传动离合机构(70)使驱动凸轮(120)和针距座(41)之间无动力传递；此时，所述驱动源(110)带动驱动凸轮(120)转动，所述驱动凸轮(120)通过第二传动离合机构(80)驱动抬压脚机构(60)动作、使压脚(90)向上抬起，所述驱动凸轮(120)通过第二传动离合机构(80)同时驱动抬牙机构(50)动作、使牙架(20)和送料牙(30)下降。
  2. 根据权利要求1所述的缝纫机，其特征在于：所述驱动源(110)为电机，所述驱动凸轮(120)固定在电机的电机轴上。
  3. 根据权利要求1所述的缝纫机，其特征在于：所述第一传动离合机构(70)包括第一连杆(71)、第二连杆(72)、固定于针距座(41)的止动板(73)、固定于缝纫机机壳(130)的固定支座(74)、以及第一弹簧(75)，所述第一连杆(71)的两端分别与驱动凸轮(120)和第二连杆(72)铰接，所述第二连杆(72)与针距座(41)铰接，所述止动板(73)上设有能够与固定支座(74)抵接的限位部(731)，所述第一弹簧(75)的两端分别与止动板(73)和固定支座(74)相连、使止动板(73)具有限位部(731)向靠近固定支座(74)方向运动的运动趋势；当第一连杆(71)和第二连杆(72)共线时，所述第一传动离合机构(70)使驱动凸轮(120)和针距座(41)之间有动力传递，所述限位部(731)与固定支座(74)之间不抵接；当第一连杆(71)和第二连杆(72)不共线时，所述第一传动离合机构(70)使驱动凸轮(120)和针距座(41)之间无动力传递，所述限位部(731)与固定支座(74)之间抵接。
  4. 根据权利要求3所述的缝纫机，其特征在于：所述第一连杆(71)和第二连杆(72)的铰接处套设有驱动扭簧(76)。
  5. 根据权利要求3所述的缝纫机，其特征在于：所述限位部(731)位于固定支座(74)的上方。
  6. 根据权利要求3所述的缝纫机，其特征在于：所述固定支座(74)面向限位部(731)的端面上固定有限位减震块(77)，所述限位部(731)上具有面向固定支座(74)的接触面，所述接触面为一平直面、并能够与限位减震块(77)抵接。
  7. 根据权利要求1所述的缝纫机，其特征在于：所述送料机构(40) 包括平行于主轴(10)的送料轴(42)、连接在主轴(10)和送料轴(42)之间的第一送料传动单元、以及连接在送料轴(42)和牙架(20)之间的第二送料传动单元；所述第一送料传动单元包括固定在主轴(10)上的送料偏心轮(43)、送料连杆(44)、第一摆动板(45)、第二摆动板(46)、固定在送料轴(42)上的送料曲柄(47)、以及所述针距座(41)，所述送料连杆(44)的一端可转动地安装在送料偏心轮(43)的外周，所述送料连杆(44)的另一端、第一摆动板(45)的一端、以及第二摆动板(46)的一端同轴铰接，所述第一摆动板(45)的另一端与针距座(41)铰接，所述第二摆动板(46)的另一端与送料曲柄(47)铰接。
  8. 根据权利要求1所述的缝纫机，其特征在于：所述第二传动离合机构(80)包括具有第二固定摆动支点(O2)的驱动板(81)、可转动地安装在驱动板(81)一端的滚柱(82)、抬压脚驱动连杆(83)、以及下供驱动连杆(84)，所述驱动板(81)的另一端、抬压脚驱动连杆(83)的一端、以及下供驱动连杆(84)的一端同轴铰接，所述抬压脚驱动连杆(83)的另一端与所述抬压脚传动部件相连，所述下供驱动连杆(84)的另一端与所述抬牙传动部件相连，所述驱动凸轮(120)的外周面上具有一段变径驱动面(121)；当所述滚柱(82)与驱动凸轮(120)上的变径驱动面(121)接触配合时，所述第二传动离合机构(80)使驱动凸轮(120)和抬压脚传动部件之间、以及驱动凸轮(120)和抬牙传动部件之间都有动力传递；当所述滚柱(82)与驱动凸轮(120)上的变径驱动面(121)不接触配合时，所述第二传动离合机构(80)使驱动凸轮(120)和抬压脚传动部件之间、以及驱动凸轮(120)和抬牙传动部件之间无动力传递。
  9. 根据权利要求8所述的缝纫机，其特征在于：所述驱动凸轮(120)的外周面上具有凹槽部(122)，所述凹槽部(122)与变径驱动面(121) 相邻设置；当所述滚柱(82)与驱动凸轮(120)上的变径驱动面(121)不接触配合时，所述滚柱(82)位于凹槽部(122)内、与驱动凸轮(120)之间不接触。
  10. 根据权利要求8所述的缝纫机，其特征在于：所述下供驱动连杆(84)与抬牙传动部件通过一平行于主轴(10)的第一轴位螺钉(150)铰接，所述下供驱动连杆(84)的下端开设有上下延伸的第一滑槽(841)，所述第一轴位螺钉(150)穿设在第一滑槽(841)中、并能够与第一滑槽(841)的上下两端抵接。
  11. 根据权利要求1所述的缝纫机，其特征在于：所述抬牙机构(50)包括平行于主轴(10)的抬牙轴(51)、连接在主轴(10)和抬牙轴(51)之间的第一抬牙传动单元、以及连接在抬牙轴(51)和牙架(20)之间的第二抬牙传动单元；所述第一抬牙传动单元包括固定在主轴(10)上的抬牙偏心轮(52)、第一抬牙连杆(53)、第二抬牙连杆(54)、以及固定在抬牙轴(51)上的抬牙曲柄(55)，所述第一抬牙连杆(53)的一端可转动地安装在抬牙偏心轮(52)的外周，所述第一抬牙连杆(53)的另一端、第二抬牙连杆(54)、以及抬牙曲柄(55)同轴铰接，所述第二抬牙连杆(54)还与第一抬牙连杆(53)铰接，所述第二抬牙连杆(54)还构成所述抬牙传动部件。
  12. 根据权利要求11所述的缝纫机，其特征在于：所述第一抬牙连杆(53)、第二抬牙连杆(54)、以及抬牙曲柄(55)三者通过一平行于主轴(10)的第二轴位螺钉(160)铰接，所述第一抬牙连杆(53)的下端开设有上下延伸的第二滑槽(531)，所述第二轴位螺钉(160)穿设在第二滑槽(531)中；所述第一抬牙连杆(53)与第二抬牙连杆(54)还通过一平行于主轴(10)的第三轴位螺钉(170)铰接，所述第二抬牙连杆(54)中开设有水平延伸的第三滑槽(544)，所述第三轴 位螺钉(170)穿设在第三滑槽(544)中。
  13. 根据权利要求12所述的缝纫机，其特征在于：所述第二抬牙连杆(54)呈凹形，包括上下延伸的杆体部(541)、从杆体部(541)的上端水平延伸出的上杆臂部(542)、以及从杆体部(541)的下端水平延伸出的下杆臂部(543)，所述第二轴位螺钉(160)穿设在杆体部(541)与下杆臂部(543)的相接处，所述第三滑槽(544)开设在杆体部(541)的上端、且背向上杆臂部(542)的一侧。
  14. 根据权利要求12所述的缝纫机，其特征在于：所述第一抬牙传动单元还包括第二弹簧(56)，所述第二弹簧(56)的两端分别与第一抬牙连杆(53)和第二抬牙连杆(54)相连、使第三轴位螺钉(170)具有向靠近第三滑槽(544)底部运动的运动趋势。
  15. 根据权利要求1所述的缝纫机，其特征在于：所述抬压脚机构(60)具有第三固定摆动支点(O3)的右杠杆(61)、抬压脚拉杆(62)、具有第四固定摆动支点(O4)的左杠杆(63)、抬压脚提升板(64)、压杆导架(65)、以及上下延伸的压杆(66)，所述右杠杆(61)构成所述抬压脚传动部件，所述右杠杆(61)的另一端与抬压脚拉杆(62)的一端铰接，所述抬压脚拉杆(62)的另一端与左杠杆(63)的一端铰接，所述左杠杆(63)的另一端与抬压脚提升板(64)的上端相铰接，所述抬压脚提升板(64)上设有提升钩部，所述压杆导架(65)上设有与提升钩部相卡合的连接突部，所述压杆导架(65)固定在压杆(66)的上端，所述压脚(90)安装在压杆(66)的下端。
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