CN217809936U - Differential tooth feeding mechanism and differential sewing machine - Google Patents

Abstract

The utility model provides a differential tooth feeding mechanism and differential sewing machine for among the differential sewing machine, differential tooth feeding mechanism includes differential tooth drive unit, differential tooth drive unit includes differential tooth drive wheel, back transmission drive assembly, differential tooth drive oscillating axle and preceding transmission drive assembly, differential tooth drive wheel is installed on driving motor, back transmission drive assembly is connected driving motor and differential tooth drive oscillating axle transmission, preceding transmission drive assembly is connected differential tooth drive oscillating axle and differential tooth transmission; the rear transmission driving assembly comprises a rear transmission crank component and a tension spring. The utility model discloses in through the rotation angle that changes driving motor, realize the electronic control to differential tooth gauge needle, avoided adopting the artifical regulation of gauge needle dial form among the prior art, and need calculate the phase angle between motor and the main shaft, optimized aircraft nose inner chamber mechanism, be convenient for installation and maintenance, control procedure is simple, easy and simple to handle.

Description

Differential tooth feeding mechanism and differential sewing machine

Technical Field

The utility model relates to a sewing machine technical field especially relates to a differential tooth feeding mechanism and differential sewing machine.

Background

The differential sewing machine with the upper differential feeding structure is sewing equipment with feeding teeth and upper differential teeth for feeding together, and has the advantages of crease resistance, crease shrinkage and suitability for special sewing processes of sewing cuffs and the like. At present, most of the differential sewing machines in the market adopt manual adjustment in a needle gage dial mode when adjusting the differential quantity, a knee rest is adopted to lift the presser foot when lifting the presser foot, or the presser foot is lifted by pneumatic drive, or the presser foot is lifted by electromagnet drive, and only a small part of the differential sewing machines adopt independent drive of a motor to adjust the differential quantity. The differential sewing machine having the above-described structure can adjust the differential amount and lift the presser foot assembly, but has the following problems.

1. The differential adjustment motor is used for independently driving the adjustment of the differential quantity, so that the cost is high and the resource is wasted.

2. The knee is driven by manpower when the presser foot is lifted, which is relatively laborious; when the presser foot is lifted in pneumatic drive or the presser foot is lifted in the electro-magnet drive, the cylinder or the electro-magnet is external, influences outward appearance and maintenance, and some user departments do not have the air supply, leads to unable the use.

3. The defect of inconvenient differential adjustment exists, and the appearance and the maintenance of equipment can be influenced when the differential adjustment motor is placed on the front side of the machine head or the side of the rear window plate (the maintenance is inconvenient because the rear window plate is detached).

The utility model discloses a utility model patent that publication number CN216274656U submitted to the intellectual property office of China among the prior art discloses a differential motion sewing machine, be provided with the differential swing seat that changes the transmission efficiency of last differential feeding mechanism, be provided with the differential shaft, including a motor, an end cap, a controller, and a cover plate, connect the first differential transmission unit of differential shaft and main shaft, connect the second differential transmission unit of differential shaft and differential presser foot subassembly, thereby realize the regulation to differential shaft deflection angle through motor, main shaft, differential swing seat, and then realize the regulation of sewing machine differential quantity, but realize the cooperation of angle between motor, the main shaft through differential swing seat in above-mentioned structure, the structure is complicated, need calculate the phase angle between motor, main shaft, the differential swing seat three simultaneously, aircraft nose inner chamber component is complicated and numerous, installation and maintenance are difficult, the while control procedure is complicated, complex operation.

SUMMERY OF THE UTILITY MODEL

In view of the above-mentioned shortcomings of the prior art, the technical problem to be solved by the present invention is to provide a differential tooth feeding mechanism and a differential sewing machine which can adjust the differential tooth needle pitch, and have simple structure and simple operation.

In order to achieve the above object, the present invention provides a differential tooth feeding mechanism for use in a differential sewing machine, the differential sewing machine includes a machine head, a driving motor, a main pressure rod, a presser foot assembly, and differential teeth, the driving motor is installed in the machine head, the differential teeth are in transmission connection with the driving motor; the main pressure lever can be vertically arranged in the machine head, a pressure lever seat is arranged on the outer peripheral side of the main pressure lever, and the pressure lever component is fixedly connected to the pressure lever seat; a pressure bar guide frame is arranged on the upper side of the pressure bar seat, the pressure bar guide frame is arranged on the outer peripheral side of the main pressure bar, and the pressure bar guide frame is used for lifting the pressure bar assembly; the differential tooth driving unit comprises a differential tooth driving wheel, a rear transmission driving component, a differential tooth driving oscillating shaft and a front transmission driving component, wherein the differential tooth driving wheel is arranged on a driving motor; the rear transmission driving assembly comprises a rear transmission crank component and a tension spring, one end of the rear transmission crank component is connected with the differential tooth driving wheel, and the other end of the rear transmission crank component is connected with the differential tooth driving swing shaft; one end of the tension spring is connected with the rear transmission crank component, and the other end of the tension spring is connected with the machine head.

Preferably, the rear transmission crank component comprises a differential tooth driving rear handle and a differential tooth driving crank, the differential tooth driving rear handle is rotatably supported in the machine head, a driving roller is arranged at one end of the differential tooth driving rear handle, the differential tooth driving rear handle is in transmission connection with a differential tooth driving wheel through the driving roller, the end part, far away from the driving roller, of the differential tooth driving rear handle is hinged with one end of the differential tooth driving crank, and the other end of the differential tooth driving crank is connected with the differential tooth driving swing shaft; one end of the tension spring is connected with the differential tooth driving rear handle, and the other end of the tension spring is connected with the machine head.

Preferably, the front transmission driving assembly comprises a differential tooth driving front crank, a differential tooth rocker arm crank, a first slider hinged at the upper end of the differential tooth rocker arm crank, a differential tooth rocker shaft rotatably supported in the machine head, a differential tooth rocker arm shaft extending up and down, a single-rod arm shaft, a second slider hinged at the outer peripheral side of the single-rod arm shaft, and a differential tooth fixing assembly hinged at the lower end of the single-rod arm shaft; a first differential sliding groove in sliding fit with the first sliding block is formed in the differential tooth driving front crank, one end, far away from the differential tooth driving front crank, of the differential tooth rocker arm crank is fixedly connected with a differential tooth rocker shaft, the differential tooth rocker shaft is parallel to a differential tooth driving swing shaft, and the differential tooth rocker arm shaft is fixed in the differential tooth rocker shaft; the single-rod arm shaft penetrates through the differential tooth rocker arm shaft from top to bottom and is connected with the pressure rod seat in a sliding mode through the second sliding block, and the differential tooth is connected with the single-rod arm shaft through the differential tooth fixing assembly.

Preferably, the differential tooth feeding mechanism further comprises a differential tooth lifting unit, the differential tooth lifting unit comprises a rear transmission lifting assembly connected with the main shaft, a differential tooth lifting transmission shaft and a front transmission lifting assembly, one end of the differential tooth lifting transmission shaft is connected with the rear transmission lifting assembly, and the other end of the differential tooth lifting transmission shaft is connected with the front transmission lifting assembly; the front transmission lifting assembly is hinged with the differential tooth fixing assembly; the differential tooth lifting transmission shaft is rotatably supported in the machine head.

Preferably, back transmission lifting subassembly includes needle bar crank, differential tooth lifting connecting rod and differential tooth lifting back crank, the needle bar crank is fixed on the main shaft, differential tooth lifting connecting rod suit is in needle bar articulate eccentric circle department, crank is articulated with differential tooth lifting connecting rod after the differential tooth lifting, the one end and the differential tooth lifting transmission shaft fixed connection of differential tooth lifting connecting rod are kept away from to crank behind the differential tooth lifting.

Preferably, the front transmission lifting assembly comprises a differential tooth lifting front crank, a lifting rolling member, a differential tooth lifting lever, an auxiliary pressure rod and a guide sleeve pin, wherein one end of the differential tooth lifting front crank is fixedly connected with the differential tooth lifting transmission shaft, and the other end of the differential tooth lifting front crank is hinged with the lifting rolling member; the auxiliary pressure rod penetrates through the main pressure rod, a spring reset piece is arranged between the main pressure rod and the auxiliary pressure rod, a third differential sliding groove is formed in the periphery of the main pressure rod, and a guide sleeve pin penetrates through the third differential sliding groove to be connected with the auxiliary pressure rod; the differential tooth lifting lever is hinged on the pressure rod guide frame;

when the differential tooth lifting transmission shaft swings, the differential tooth lifting front crank drives the lifting rolling piece to abut against one end of a differential tooth lifting lever, the differential tooth lifting lever rotates around a hinged point on the pressure rod guide frame, and one end, far away from the lifting rolling piece, of the differential tooth lifting lever abuts against the guide sleeve pin.

In order to achieve the above object, the utility model also provides a differential sewing machine, including foretell differential tooth feeding mechanism, still including lifting the presser foot unit, lift the presser foot unit including lifting the presser foot drive wheel, lift behind the presser foot drive assembly, lift the presser foot pull rod and lift the preceding drive assembly of presser foot, it installs on driving motor to lift the presser foot drive wheel, lift behind the presser foot drive assembly with driving motor with lift presser foot pull rod transmission and be connected, the drive assembly will lift the presser foot pull rod before lifting the presser foot and be connected with the depression bar guide frame transmission.

Preferably, the rear transmission assembly for lifting the presser foot comprises a rear crank for lifting the presser foot, a lifting roller, a top rod for lifting the presser foot and a rear lever for lifting the presser foot, wherein the rear crank for lifting the presser foot is rotatably supported in the machine head, one end of the rear crank for lifting the presser foot is hinged with the lifting roller, and the other end of the rear crank for lifting the presser foot is hinged with the top rod for lifting the presser foot; the end part of the presser foot lifting ejector rod, which is far away from the presser foot lifting rear crank, is connected with the presser foot lifting pull rod through a presser foot lifting rear lever.

Preferably, the presser foot lifting front transmission assembly comprises a presser foot lifting front lever and a presser foot lifting plate, the presser foot lifting front lever is rotatably supported in the machine head, one end of the presser foot lifting pull rod, which is far away from the presser foot lifting rear lever, is hinged to the presser foot lifting front lever, the presser foot lifting front lever is hinged to the presser foot lifting plate, and the end part of the presser foot lifting plate, which is far away from the presser foot lifting front lever, is connected to the pressure bar guide frame.

Preferably, the peripheral wheel surfaces of the differential tooth driving wheel and the pressure foot lifting driving wheel respectively comprise a reducing driving section and an equal-diameter idle stroke section; the differential tooth driving wheel and the presser foot lifting driving wheel are combined into an integral driving wheel which is fixed on a motor shaft of the driving motor; or the differential tooth driving wheel and the pressure foot lifting driving wheel are two independent parts and are respectively fixed on a motor shaft of the driving motor.

As described above, the utility model relates to a differential tooth feeding mechanism and differential sewing machine has following beneficial effect:

the utility model relates to a differential tooth feeding mechanism and differential sewing machine, differential tooth drive unit include back transmission crank parts, differential tooth drive wheel, driving motor and extension spring, drive the swing of differential tooth drive wheel through driving motor, and differential tooth drive wheel promotes back transmission crank parts, then the extension spring will back transmission crank parts pull back to realize back transmission crank parts's reciprocal swing. The reciprocating swing of the rear transmission crank component is in transmission connection with the differential tooth through the differential tooth driving swing shaft and the front transmission driving component, so that the forward and backward movement of the differential tooth is realized. When the rotation angle of the driving motor is changed, the distance of the forward and backward movement of the differential tooth is changed, so that the electronic adjustment of the needle pitch of the differential tooth is realized, the manual adjustment in the form of a needle pitch dial in the prior art is avoided, the phase angle between the motor and the main shaft needs to be calculated, the mechanism of the inner cavity of the handpiece is optimized, the installation and the maintenance are convenient, the control program is simple, and the operation is simple and convenient.

Drawings

FIG. 1 is a schematic space view of a differential sewing machine according to the present invention;

FIG. 2 is a schematic view of the differential sewing machine according to the present invention; (removing the handpiece case)

FIG. 3 is a schematic space view of the differential tooth feeding mechanism and the differential tooth driving unit of the differential sewing machine of the present invention;

FIG. 4 is a schematic space view of the presser foot lifting unit of the differential sewing machine of the present invention;

FIG. 5 is a schematic space view of the differential feed mechanism and the differential lifting unit of the differential sewing machine of the present invention;

FIG. 6 is a side view of the differential feed mechanism and the differential lifting unit of the differential sewing machine of the present invention;

FIG. 7 is a schematic space view of the differential tooth feeding mechanism and the differential tooth driving wheel and the presser foot lifting driving wheel of the differential sewing machine of the present invention;

fig. 8 is a schematic space view of the differential tooth feeding mechanism and the presser foot lifting rear crank of the differential sewing machine of the present invention;

FIG. 9 is a schematic view showing a first state of the differential feed mechanism and the differential sewing machine according to the present invention;

FIG. 10 is a schematic view showing a second state of the differential tooth feed mechanism and the differential tooth straight seam of the differential sewing machine of the present invention;

fig. 11 is a movement trace diagram of the differential tooth feed mechanism and the differential tooth sewing of the differential sewing machine of the present invention.

Description of reference numerals:

1. a machine head; 101. a main shaft; 102. a main pressure lever; 103. a pressure bar seat; 104. a compression bar guide frame; 105. a presser foot assembly securing assembly; 106. a presser foot assembly;

2. a base plate; 201. a needle plate; 202. the feeding tooth drives the actuating mechanism; 203. a feed dog link assembly;

3. a drive motor; 301. a motor mounting plate;

4. a differential tooth drive unit; 401. a differential tooth drive wheel; 402. driving the roller; 403. a spring pull pin; 404. a strut pin; 405. the differential tooth drives the rear handle; 406. a tension spring; 407. a spring pulling plate; 408. a differential tooth drive crank; 409. a retainer ring; 410. The differential tooth drives the swing shaft; 411. the differential gear drives the front crank; 412. a first slider; 413. a differential tooth rocker arm crank; 414. A differential rocker shaft; 415. a rocker shaft sleeve; 416. a differential tooth rocker arm shaft; 417. a single-lever arm shaft; 418. a differential tooth fixing component; 419. differential teeth; 420. a second slider; 4001. a differential tooth driving wheel reducing section; 4002. a differential tooth driving wheel idle stroke section;

5. a presser foot lifting unit; 501. lifting a presser foot driving wheel; 502. lifting and pressing the roller; 503. lifting a rear crank of the presser foot; 504. a spacer; 505. Lifting a presser foot ejector rod; 506. lifting a rear lever of the presser foot; 507. lifting a presser foot pull rod; 508. lifting a presser foot front lever; 509. lifting the presser foot lifting plate; 5001. lifting the presser foot driving wheel reducing section; 5002. lifting the presser foot to drive the idle stroke section of the wheel;

6. a differential tooth lifting unit; 601. a needle bar crank; 602. a differential tooth lifting link; 603. the differential tooth lifts the rear crank; 604. Lifting the transmission shaft sleeve; 605. the differential tooth lifts the front crank; 606. the differential tooth lifts the transmission shaft; 607. a differential tooth lift lever; 608. lifting the rolling member; 609. an auxiliary pressure lever; 610. a guide sleeve pin; 611. a pressure bar roller; 612. and a spring return member.

Detailed Description

The following description is provided for illustrative purposes, and other advantages and features of the present invention will become apparent to those skilled in the art from the following detailed description.

It should be understood that the drawings of the present application are only used to match the contents disclosed in the specification, so as to be known and read by those skilled in the art, and not to limit the practical limitations of the present invention, so that the present application does not have any technical significance, and any modification of the structure, change of the ratio relationship, or adjustment of the size should still fall within the scope of the present application without affecting the function and the achievable purpose of the present application. Meanwhile, the terms such as "upper", "lower", "left", "right", "middle", and the like used in the present specification are for convenience of description, and are not intended to limit the scope of the present invention, and changes or adjustments of the relative relationship thereof may be considered as the scope of the present invention without substantial changes in the technical content.

As shown in fig. 1, the present invention provides a differential tooth feeding mechanism, for convenience of description, the length direction of the bottom plate 2 is defined as the left-right direction, the width direction of the bottom plate 2 is the front-back direction, the height direction of the bottom plate 2 is the up-down direction, so that in fig. 9, the up-down direction and the up-down direction of the paper are respectively the up-down direction and the down-down direction, the left-right direction and the front-back direction of the paper are respectively the front-back direction and the left-right direction.

As shown in fig. 1-4, the utility model provides a differential tooth feeding mechanism, which is used in a differential sewing machine, the differential sewing machine comprises a machine head 1, a driving motor 3, a main pressure rod 102, a presser foot component 106 and differential teeth 419, the driving motor 3 is installed on the left side of the machine head 1 through a motor installation plate 301, and the differential teeth 419 are in transmission connection with the driving motor 3 through the differential tooth feeding mechanism; the main pressure rod 102 can be installed in the machine head 1 in a vertical movement mode, the outer periphery side of the main pressure rod 102 is fastened with a pressure rod seat 103 through a bolt, and a pressure foot assembly 106 is connected to the pressure rod seat 103 through a pressure foot assembly fixing assembly 105; a pressure bar guide 104 is arranged above the pressure bar seat 103, the pressure bar guide 104 is fastened on the outer periphery of the main pressure bar 102 through bolts, and the pressure bar guide 104 is used for lifting the pressure bar assembly 106. The differential tooth feeding mechanism comprises a differential tooth driving unit 4, the differential tooth driving unit 4 comprises a differential tooth driving wheel 401, a rear transmission driving component, a differential tooth driving swing shaft 410 and a front transmission driving component, the differential tooth driving wheel 401 is installed on a motor shaft of the driving motor 3, the rear transmission driving component is used for driving and connecting the driving motor 3 and the differential tooth driving swing shaft 410, and the front transmission driving component is used for driving and connecting the differential tooth driving swing shaft 410 and the differential tooth 419; the rear transmission driving component comprises a rear transmission crank component and a tension spring 406, the bottom end of the rear transmission crank component is connected with the differential tooth driving wheel 401, and the top end of the rear transmission crank component is connected with the differential tooth driving swing shaft 410; the rear end of the tension spring 406 is connected with the rear transmission crank component, and the front end is connected with the machine head 1.

The utility model discloses a differential tooth feeding mechanism drives differential tooth drive wheel 401 through driving motor 3 and swings, and differential tooth drive wheel 401 pushes away back transmission crank parts, and then extension spring 406 will back transmission crank parts draws back, realizes back transmission crank parts's reciprocal swing, then is realizing the seesaw of differential tooth 419 through mechanical transmission parts. When the needle pitch (i.e., the forward and backward movement displacement) of the differential tooth 419 needs to be adjusted, the needle pitch of the differential tooth 419 can be adjusted by accurately adjusting the rotation angle of the driving motor 3, so that the manual adjustment and the mode of adjusting the phase angle between the motor and the spindle 101 in the prior art are effectively avoided, and the device is simple and convenient to operate and high in applicability.

Further, in this embodiment, the driving motor 3 is further connected with an angle control assembly such as a rotary encoder, which is used for accurately controlling the rotation angle of the driving motor 3.

Preferably, as shown in fig. 3, the rear transmission crank component includes a differential tooth driving rear handle 405 and a differential tooth driving crank 408, the differential tooth driving rear handle 405 is rotatably supported in the handpiece 1, a driving roller 402 is disposed at the bottom end of the differential tooth driving rear handle 405, the differential tooth driving rear handle 405 is in transmission connection with the differential tooth driving wheel 401 through the driving roller 402, the top end of the differential tooth driving rear handle 405 is hinged to the bottom end of the differential tooth driving crank 408, and the top end of the differential tooth driving crank 408 is fixedly sleeved at the left end of the differential tooth driving swing shaft 410; the rear end of the tension spring 406 is connected with the differential tooth driving rear handle 405, and the front end is connected with the handpiece 1. Further, in this embodiment, a through hole is formed in the middle of the differential tooth driving rear handle 405, a support pin 404 is inserted into the through hole, and the support pin 404 is fixed in the handpiece 1 to provide a fulcrum for the deflection of the differential tooth driving rear handle 405. A roller screw penetrates through the central shaft of the driving roller 402, and the driving roller 402 is hinged at the bottom of the differential tooth driving rear handle 405 through the roller screw. A through hole is further formed between the middle part and the bottom part of the differential tooth driving rear handle 405, a spring pull pin 403 penetrates through the through hole, and the rear end of the tension spring 406 is hooked on the spring pull pin 403. Further, in the present embodiment, the differential tooth driving swing shaft 410 is inserted into the handpiece 1, and two retaining rings 409 are further disposed on the differential tooth driving swing shaft 410 for limiting the axial movement of the differential tooth driving swing shaft 410. Further, the front end of the tension spring 406 is further provided with a spring pulling plate 407, the spring pulling plate 407 is fixed in the handpiece 1 through a screw, and the front end of the tension spring 406 is hooked on the spring pulling plate 407. The tension spring 406 provides tension to the differential tooth drive rear handle 405 by means of the elastic potential energy of the tension spring.

Preferably, as shown in fig. 3, the front transmission driving assembly includes a differential tooth driving front crank 411, a differential tooth rocker arm crank 413, a first slider 412 hinged on the upper end of the differential tooth rocker arm crank 413 through a pin, a differential tooth rocker shaft 414 rotatably supported in the handpiece 1, a differential tooth rocker arm shaft 416 extending up and down, a single-lever arm shaft 417, a second slider 420 hinged on the outer periphery side of the single-lever arm shaft 417, and a differential tooth fixing assembly 418 hinged on the lower end of the single-lever arm shaft 417; a first differential sliding groove in sliding fit with the first sliding block 412 is formed in the differential tooth driving front crank 411 in an up-down extending mode, the bottom end of the differential tooth rocker arm crank 413 is fixedly connected with a differential tooth rocker shaft 414 through a bolt, the differential tooth rocker shaft 414 is parallel to the differential tooth driving swing shaft 410, and the differential tooth rocker arm shaft 416 is fixed in the differential tooth rocker shaft 414 in an up-down extending mode; a second differential sliding groove in sliding fit with the second slider 420 is formed in the pressure lever seat 103, the single-lever arm shaft 417 is vertically inserted into the differential tooth rocker arm shaft 416 and is in sliding connection with the pressure lever seat 103 through the second slider 420, and the differential tooth 419 is connected with the single-lever arm shaft 417 through the differential tooth fixing component 418.

Further, in the present embodiment, the differential tooth driving front crank 411 is fixed to the right end of the differential tooth driving swing shaft 410 by a bolt. The differential rocker shaft 414 is provided with a rocker boss 415 on the outer periphery thereof, and the rocker boss 415 is inserted into the head 1, thereby achieving the rotation of the differential rocker shaft 414 in the head 1. A through hole is formed in the right end of the differential tooth rocker shaft 414 in a vertically penetrating manner, a differential tooth rocker arm shaft 416 is inserted into the through hole, and the differential tooth rocker arm shaft 416 is a hollow piece. The pressure bar seat 103 is a U-shaped part, the second differential sliding grooves are formed in two opposite side walls of the pressure bar seat 103, the sliding grooves extending up and down are formed in the periphery of the differential tooth rocking bar arm shaft 416 in a left-right penetrating mode, the two second sliding blocks 420 are clamped in the second differential sliding grooves and connected through pin shafts between the two second sliding blocks 420, and the pin shafts penetrate through the sliding grooves in the differential tooth rocking bar arm shaft 416 to be fixedly connected with the single-bar arm shaft 417. When the differential tooth rocker arm shaft 416 swings, the single-lever arm shaft 417 swings along with the swing, so that the differential tooth fixing component 418 is driven to swing back and forth. When the single-lever arm shaft 417 swings, the second slider 420 moves in the second differential link, and guides the swing of the single-lever arm shaft 417.

Preferably, as shown in fig. 5 and 6, the differential tooth feeding mechanism further includes a differential tooth lifting unit 6, the differential tooth lifting unit 6 includes a rear transmission lifting assembly in transmission connection with the main shaft 101, a differential tooth lifting transmission shaft 606, and a front transmission lifting assembly, the left end of the differential tooth lifting transmission shaft 606 is connected with the rear transmission lifting assembly, and the right end is connected with the front transmission lifting assembly; the front transmission lifting assembly is hinged with the differential tooth fixing assembly 418; a differential tooth lifting drive shaft 606 is rotatably supported in the handpiece 1. In the present embodiment, the main shaft 101 is installed in the head 1, and the main shaft 101 is restricted in axial movement and can rotate in the radial direction.

Preferably, as shown in fig. 5 and 6, the rear transmission lifting assembly includes a needle bar crank 601, a differential tooth lifting connecting rod 602, and a differential tooth lifting rear crank 603, the needle bar crank 601 is sleeved on the main shaft 101 through a bearing, the differential tooth lifting connecting rod 602 is sleeved on an eccentric circle of the needle bar crank 601 and limits axial movement of the differential tooth lifting connecting rod 602 to be limited, the differential tooth lifting rear crank 603 is hinged to the differential tooth lifting connecting rod 602, and one end of the differential tooth lifting rear crank 603, which is far away from the differential tooth lifting connecting rod 602, is fixedly connected to the differential tooth lifting transmission shaft 606. Further, in this embodiment, the differential tooth lifting transmission shaft 606 is parallel to the main shaft 101, and a lifting transmission shaft sleeve 604 is disposed on the periphery of the differential tooth lifting transmission shaft 606, and the lifting transmission shaft sleeve 604 is fixed in the handpiece 1, so as to ensure that the differential tooth lifting transmission shaft 606 rotates in the handpiece 1. The bottom end of the differential tooth lifting connecting rod 602 is hinged with a differential tooth lifting rear crank 603 through a connecting pin; when the main shaft 101 rotates, the differential tooth lifting connecting rod 602 moves up and down through the needle bar crank 601, so as to drive the differential tooth lifting back crank 603 to move up and down, and the differential tooth 419 lifting crank moves up and down to drive the differential tooth lifting transmission shaft 606 to rotate.

Preferably, as shown in fig. 5 and 6, the front transmission lifting assembly comprises a differential tooth lifting front crank 605, a lifting rolling member 608, a differential tooth lifting lever 607, a secondary pressure bar 609 and a guide sleeve pin 610, wherein the bottom end of the differential tooth lifting front crank 605 is fixedly connected with the differential tooth lifting transmission shaft 606 through a bolt, and the top end of the differential tooth lifting front crank is hinged with the lifting rolling member 608; the auxiliary pressure lever 609 is arranged in the main pressure lever 102 in a penetrating manner, a spring reset piece 612 is arranged between the main pressure lever 102 and the auxiliary pressure lever 609, a third differential sliding groove is formed in the periphery of the main pressure lever 102, and a guide sleeve pin 610 is arranged in the third differential sliding groove in a penetrating manner and connected with the auxiliary pressure lever 609; the differential tooth lifting lever 607 is hinged on the pressure lever guide 104; when the differential tooth lifting transmission shaft 606 swings, the differential tooth lifting front crank 605 drives the lifting rolling piece 608 to abut against the front end of the differential tooth lifting lever 607, the differential tooth lifting lever 607 rotates around the hinge point on the pressure lever guide 104, and the rear end of the differential tooth lifting lever 607 abuts against the guide sleeve pin 610. Further, the differential tooth lift lever 607 is an L-shaped piece.

Further, in this embodiment, the lift roller 608 is a bearing fixed to the tip of the differential lift front crank 605 via a connecting shaft. In other embodiments, the lift roller 608 may also employ balls, rollers, or the like. In the present embodiment, as shown in fig. 6, a fourth differential sliding slot is formed through the rear end of the differential tooth fixing assembly 418, a pressing rod roller 611 is disposed at the bottom of the secondary pressing rod 609, and the pressing rod roller 611 is clamped in the fourth differential sliding slot.

When the rear end of the differential tooth lifting lever 607 abuts against the guide sleeve pin 610, the differential tooth lifting lever 607 lifts the sub pressure lever 609 upwards through the guide sleeve pin 610, the pressure lever roller 611 at the bottom of the sub pressure lever 609 lifts upwards to abut against the top surface of the fourth differential sliding groove, so that the differential tooth fixing component 418 is lifted upwards, and the differential tooth 419 is pulled up.

Further, as shown in fig. 7, in the present embodiment, the differential tooth drive wheel 401 includes a differential tooth drive wheel diameter-changing section 4001 and a differential tooth drive wheel idle stroke section 4002. The outer peripheral surface of the differential tooth driving wheel reducing section 4001 is a reducing surface, and the motion of the differential tooth driving wheel 401 in the feeding process of the differential tooth 419 is reciprocating swing motion, and is not 360-degree rotation motion.

The utility model relates to a differential tooth feeding mechanism has differential tooth drive unit 4 and differential tooth lifting unit 6 simultaneously, and differential tooth drive unit 4 makes differential tooth 419 seesaw, and differential tooth lifting unit 6 makes differential tooth 419 up-and-down motion.

The differential tooth feeding mechanism has the following specific working process:

1. the differential tooth 419 moves forward (feeding state). As shown in fig. 3, the driving motor 3 is operated to drive the differential tooth driving wheel 401 to swing, the differential tooth driving wheel 401 abuts against the driving roller 402 to push the bottom end of the differential tooth driving rear handle 405 to swing backward, the differential tooth driving rear handle 405 rotates around the support pin 404 while the tension spring 406 is stretched, the differential tooth driving rear handle 405 swings forward, the differential tooth driving swing shaft 410 drives the differential tooth driving front crank 411 to swing forward, the differential tooth driving front crank 411 drives the differential tooth rocker arm crank 413 to swing forward through the first slider 412, the differential tooth rocker arm shaft 414 drives the differential tooth rocker arm shaft 416 and the single-rod arm shaft 417 to swing forward synchronously, and the differential tooth fixing component 418 at the bottom of the single-rod arm shaft 417 drives the differential tooth 419 to move forward, so as to realize forward feeding of the differential tooth 419. During the forward swing of the single-lever arm shaft 417, the second slider 420 guides the second differential sliding groove of the pressure lever seat 103, so as to avoid the collision of the differential tooth 419 with the presser foot assembly 106 during the feeding process.

2. The differential tooth 419 moves backward (reset state). As shown in fig. 3, the driving motor 3 operates to drive the differential tooth driving wheel 401 to swing in a reverse direction, the differential tooth driving wheel 401 is far away from the driving roller 402, the tension spring 406 is restored from the stretching state to the normal state, and the tension spring 406 pulls the bottom end of the differential tooth driving rear handle 405 to swing forward, so that the driving roller 402 is always abutted to the differential tooth driving wheel reducer 4001. The bottom end of the differential tooth driving rear handle 405 swings forwards, the differential tooth driving rear handle 405 rotates around the support pin 404, the top end of the differential tooth driving rear handle 405 swings backwards, and then the differential tooth driving swing shaft 410 drives the differential tooth driving front crank 411 to swing backwards, the differential tooth driving front crank 411 drives the differential tooth rocker arm crank 413 to swing backwards through the first slider 412, and then the differential tooth rocker arm shaft 414 drives the differential tooth rocker arm shaft 416 and the single-rod arm shaft 417 to swing backwards synchronously, the differential tooth fixing component 418 at the bottom of the single-rod arm shaft 417 drives the differential tooth 419 to move backwards, so that the reset of the differential tooth 419 is realized, and the cyclic feeding of the differential tooth 419 is facilitated.

3. The differential tooth 419 is in a floating state (reset state). As shown in fig. 5 and 6, the main shaft 101 rotates to drive the needle rod crank 601 to rotate, the differential tooth lifting connecting rod 602 is installed at an eccentric circle of the needle rod crank 601, when the differential tooth lifting connecting rod 602 moves upward, the differential tooth lifting connecting rod 602 drives the differential tooth lifting rear crank 603 to move upward, further, the differential tooth lifting transmission shaft 606 drives the differential tooth lifting front crank 605 to deflect forward, and the lifting rolling element 608 at the top end of the differential tooth lifting front crank 605 abuts against the front end of the differential tooth lifting lever 607. When the lifting rolling element 608 continues to move forward, the differential tooth lifting lever 607 rotates around the fulcrum of the differential tooth lifting lever 607 and the pressure lever guide frame 104, the rear end of the differential tooth lifting lever 607 lifts the secondary pressure lever 609 through the guide sleeve pin 610, the spring reset element 612 between the main pressure lever 102 and the secondary pressure lever 609 is compressed, and the pressure lever roller 611 at the bottom of the secondary pressure lever 609 abuts against the top surface of the fourth differential sliding groove in the differential tooth fixing component 418, so that the differential tooth 419 is in a suspended state.

4. The differential teeth 419 are in a depressed state (feed state). As shown in fig. 5 and 6, the main shaft 101 rotates to drive the needle rod crank 601 to rotate, the differential tooth lifting connecting rod 602 is installed at the eccentric circle of the needle rod crank 601, when the differential tooth lifting connecting rod 602 moves downward, the differential tooth lifting connecting rod 602 drives the differential tooth lifting rear crank 603 to move downward, and then the differential tooth lifting transmission shaft 606 drives the differential tooth lifting front crank 605 to deflect backward, the lifting rolling element 608 at the top end of the differential tooth lifting front crank 605 is separated from the front end of the differential tooth lifting lever 607, the secondary pressure rod 609 moves downward in the main pressure rod 102 under the action of the spring resetting element 612, so that the pressure rod roller 611 at the bottom of the secondary pressure rod 609 abuts against the bottom surface of the fourth differential sliding groove in the differential tooth fixing assembly 418, and the differential tooth 419 is in a downward pressing state.

5. The operator matches the forward movement of the differential tooth 419 with the pressing-down state, so that the differential tooth 419 is contacted with the needle plate 201 to feed the sewing material, and the feeding track of the differential tooth 419 is shown in fig. 9. The backward movement of the differential tooth 419 is matched with the suspension state, the suspension restoration of the differential tooth 419 is realized, and the suspension restoration track of the differential tooth 419 is shown in fig. 10.

By controlling the phase angle between the main shaft 101 and the drive motor 3, the up-and-down movement and the forward-and-backward movement of the differential teeth 419 are synchronized, and the differential teeth 419 perform cyclic feeding in a reciprocating manner forward and backward. The feeding track when the differential teeth 419 are in the normal position is shown in fig. 11.

6. An operator controls a rotary encoder or the like to precisely adjust and control the rotation angle of the drive motor 3, so that the swing amplitude of the differential tooth drive wheel 401 is varied to change the pitch of the differential teeth 419. When the motion time sequence of the driving motor 3 is matched with the work time sequence of the main shaft 101 (namely the pressing state of the differential tooth 419 is matched with the forward motion state, and the suspension state of the differential tooth 419 is matched with the backward motion state), the differential tooth 419 performs forward feeding; when the motion time sequence of the driving motor 3 is different from the working time sequence of the main shaft 101 by 180 degrees (namely, the pressing state of the differential tooth 419 is matched with the backward motion state, and the suspension state of the differential tooth 419 is matched with the forward motion state), the differential tooth 419 performs backstitch feeding.

In order to realize above-mentioned purpose and other objects, the utility model provides a differential sewing machine still, including foretell differential tooth feeding mechanism, as shown in fig. 4, still including lifting presser foot unit 5, lift presser foot unit 5 including lifting presser foot drive wheel 501, lift transmission assembly behind the presser foot, lift presser foot pull rod 507 and lift transmission assembly before the presser foot, lift presser foot drive wheel 501 and install on driving motor 3's motor shaft, lift transmission assembly behind the presser foot with driving motor 3 with lift presser foot pull rod 507 transmission and be connected, lift presser foot preceding transmission assembly and will lift presser foot pull rod 507 and be connected with depression bar guide 104 transmission.

Furthermore, the utility model relates to a differential sewing machine has differential feeding mechanism and pay-off tooth feeding mechanism simultaneously. The surface of the bottom plate 2 is provided with a needle plate 201, the bottom plate 2 is provided with a feeding tooth transmission actuating mechanism 202, the feeding tooth transmission actuating mechanism 202 is in transmission connection with the main shaft 101 through a feeding tooth connecting rod assembly 203, and the feeding tooth is driven to feed and drive sewing materials.

Preferably, as shown in fig. 4, the presser foot lifting rear transmission assembly includes a presser foot lifting rear crank 503, a presser foot lifting roller 502, a presser foot lifting ejector rod 505, and a presser foot lifting rear lever 506, the presser foot lifting rear crank 503 is rotatably supported in the machine head 1, one end of the presser foot lifting rear crank 503 is hinged to the presser foot lifting roller 502 through a roller screw, and the other end of the presser foot lifting rear crank 503 is hinged to the presser foot lifting ejector rod 505; the end of presser foot lifting ram 505 remote from presser foot lifting rear crank 503 is connected to presser foot lifting pull rod 507 via presser foot lifting rear lever 506. In this embodiment, as shown in fig. 8, three through holes are formed in the presser foot lifting rear crank 503, and the connecting lines of the centers of the three through holes form a triangle. One through hole is used for connecting the pressure raising roller 502, the other through hole is used for connecting the pressure raising pin ejector rod 505, and the other through hole is sleeved on the support pin 404. The pressure foot lifting rear lever 506 is hinged in the machine head through an axis screw.

Preferably, as shown in fig. 4, the presser foot lifting front transmission assembly includes a presser foot lifting front lever 508 rotatably supported in the head 1, and a presser foot lifting plate 509, the right end of the presser foot lifting pull rod 507 is hinged to the presser foot lifting front lever 508, the presser foot lifting front lever 508 is hinged to the presser foot lifting plate 509, and the end of the presser foot lifting plate 509 far from the presser foot lifting front lever 508 is connected to the press rod guide 104. Further, in this embodiment, three through holes are formed in the front lever 508 of the presser foot lifting device, and the connection lines of the centers of the three through holes form a triangle. One through hole is hinged with a presser foot lifting pull rod 507, one through hole is hinged with a presser foot lifting plate 509, and the other through hole is hinged with the machine head 1; when the presser foot lifting pull rod 507 applies force to the presser foot lifting front lever 508, the presser foot lifting front lever 508 rotates around the hinge point with the machine head 1, thereby driving the deflection of the presser foot lifting plate 509. Further, in this embodiment, a protrusion is further disposed at the front end of the pressing rod guide 104, a hook groove is disposed on the pressing rod lifting plate 509, and the protrusion is clamped in the hook groove, so that the pressing rod guide 104 is lifted by lifting the pressing rod lifting plate 509, and the pressing rod assembly 106 is driven to be lifted.

Preferably, as shown in fig. 7, the peripheral wheel surfaces of the differential tooth driving wheel 401 and the pressure foot lifting and driving wheel 501 both include a reducing driving section and an equal-diameter idle stroke section; the differential tooth driving wheel 401 and the presser foot lifting driving wheel 501 are combined into an integral driving wheel which is fixed on a motor shaft of the driving motor 3; alternatively, the differential tooth driving wheel 401 and the presser foot lifting driving wheel 501 are two independent members and are fixed to the motor shaft of the driving motor 3. Further, in this embodiment, the presser foot lifting driving wheel 501 includes a presser foot lifting driving wheel diameter-changing section 5001 and a presser foot lifting driving wheel idle stroke section 5002.

In this embodiment, the differential tooth driving wheel 401 and the presser foot lifting driving wheel 501 are combined into an integral driving wheel, the differential tooth driving wheel diameter-changing section 4001 corresponds to the presser foot lifting driving wheel idle stroke section 5002, and the differential tooth driving wheel idle stroke section 4002 corresponds to the presser foot lifting driving wheel diameter-changing section 5001; that is, when the driving roller 402 of the rear handle 405 driven by the differential teeth swings on the variable diameter section 4001 of the differential teeth driving wheel, the pressure lifting roller 502 on the rear crank 503 of the pressure lifting foot always abuts against the empty stroke section 5002 of the pressure lifting foot driving wheel, and the pressure foot component 106 does not act; when the pressure raising roller 502 on the pressure raising rear crank 503 swings on the pressure raising driving wheel diameter-changing section 5001, the driving roller 402 of the differential tooth driving rear handle 405 always abuts against the differential tooth driving wheel idle stroke section 4002, and the differential tooth 419 does not move in the front-rear direction.

Further, in this embodiment, the differential tooth driving rear handle 405 and the pressure foot lifting rear crank 503 are both sleeved on the same support pin 404, and the differential tooth driving rear handle 405 and the pressure foot lifting rear crank 503 are separated by the spacer 504, so that the axial movement of the differential tooth driving rear handle 405 and the pressure foot lifting rear crank 503 on the support pin 404 is avoided, and the movement interference occurs.

The utility model relates to a differential sewing machine, differential tooth feeding mechanism when driving the sewing material, the drive roller 402 of differential tooth drive back handle 405 swings on differential tooth drive wheel reducing section 4001, lifts the pressure foot back on the crank 503 lift the pressure roller 502 and support all the time and lean on and lift pressure foot drive wheel idle stroke section 5002, and presser foot subassembly 106 does not move.

When the presser foot is required to be lifted, the driving motor 3 drives the presser foot lifting driving wheel 501 to rotate, so that the lifting roller 502 on the presser foot lifting rear crank 503 swings on the presser foot lifting driving wheel diameter-changing section 5001, the lifting roller 502 drives the presser foot lifting rear crank 503 to rotate upwards around the support pin 404, the presser foot lifting ejector rod 505 pushes the presser foot lifting rear lever 506 upwards, the presser foot lifting rear lever 506 drives one end of the presser foot lifting pull rod 507 to rotate downwards, and then the presser foot lifting front lever 508 and the presser foot lifting plate 509 at the other end of the presser foot lifting pull rod 507 are driven to move upwards, so that the pressure bar guide frame 104 is lifted upwards, and the main pressure bar 102 drives the pressure bar seat 103 and the presser foot assembly 106 to ascend.

When an operator presses the presser foot component 106 on a sewing material through the elastic pin, the threaded shaft pin and the external threaded shaft pin (the elastic pin, the threaded shaft pin and the external threaded shaft pin are common parts in a sewing machine), the pressure lever guide 104 drives the presser foot lifting plate 509 to move downwards, so that the presser foot lifting plate drives one end of the presser foot lifting pull rod 507 to rotate downwards through the presser foot lifting front lever 508, the presser foot lifting rear lever 506 at the other end of the presser foot lifting pull rod 507 moves upwards to drive the presser foot lifting ejector rod 505 to move downwards, the presser foot lifting roller 502 on the presser foot lifting rear crank 503 moves downwards until the presser foot lifting roller 502 abuts against the presser foot lifting driving wheel reducing section 5001, and therefore the circulation of the presser foot lifting action is achieved.

The rotation angle of the driving motor 3 is changed by an operator through a rotary encoder and the like, so that the displacement of the diameter-changing section 5001 of the presser foot lifting driving wheel and the pressing roller 502 is changed, the lifting height of the presser foot component 106 is adjusted, the height of the presser foot component 106 can be adjusted electronically, the presser foot component is suitable for sewing materials with different thicknesses, and the application range is wide.

The utility model relates to a differential tooth feeding mechanism and differential sewing machine, which can realize the electronic feeding of differential tooth 419 and the automatic pressure lifting function of the presser foot component 106 by a driving motor 3; the rotation angle of the driving motor 3 can be adjusted through angle adjusting parts such as a rotary encoder, so that the needle distance of feeding of the differential teeth 419 and the lifting height of the presser foot assembly 106 are adjusted electronically, complex operation of calculating phase angles among the motor, the spindle 101 and the differential swing seat three simultaneously through manpower in the prior art is avoided, operation is convenient, the structure is simple, the problem that parts in the inner cavity of the machine head 1, which are brought by the differential swing seat, are complex, and disassembly, assembly and maintenance are convenient is solved.

To sum up, the utility model effectively overcomes various defects in the prior art and has high industrial utilization value.

The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Any person skilled in the art can modify or change the above embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which may be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.

Claims (10)

1. A differential tooth feeding mechanism is used in a differential sewing machine, the differential sewing machine comprises a machine head (1), a driving motor (3), a main pressure rod (102), a pressure foot assembly (106) and differential teeth (419), the driving motor (3) is installed in the machine head (1), and the differential teeth (419) are in transmission connection with the driving motor (3); the main pressure lever (102) can be vertically arranged in the machine head (1), a pressure lever seat (103) is arranged on the outer peripheral side of the main pressure lever (102), and the pressure foot assembly (106) is fixedly connected to the pressure lever seat (103); a pressure lever guide frame (104) is arranged on the upper side of the pressure lever seat (103), the pressure lever guide frame (104) is arranged on the outer peripheral side of the main pressure lever (102), and the pressure lever guide frame (104) is used for lifting the pressure foot assembly (106); the method is characterized in that:

the differential tooth driving device comprises a differential tooth driving unit (4), wherein the differential tooth driving unit (4) comprises a differential tooth driving wheel (401), a rear transmission driving component, a differential tooth driving swing shaft (410) and a front transmission driving component, the differential tooth driving wheel (401) is installed on a driving motor (3), the rear transmission driving component is used for driving and connecting the driving motor (3) and the differential tooth driving swing shaft (410), and the front transmission driving component is used for driving and connecting the differential tooth driving swing shaft (410) and a differential tooth (419);

the rear transmission driving assembly comprises a rear transmission crank component and a tension spring (406), one end of the rear transmission crank component is connected with the differential tooth driving wheel (401), and the other end of the rear transmission crank component is connected with the differential tooth driving swing shaft (410); one end of the tension spring (406) is connected with the rear transmission crank component, and the other end of the tension spring is connected with the machine head (1).

2. The differential tooth feed mechanism of claim 1, wherein: the rear transmission crank component comprises a differential tooth driving rear handle (405) and a differential tooth driving crank (408), the differential tooth driving rear handle (405) is rotatably supported in the handpiece (1), one end of the differential tooth driving rear handle (405) is provided with a driving roller (402), the differential tooth driving rear handle (405) is in transmission connection with a differential tooth driving wheel (401) through the driving roller (402), the end part, far away from the driving roller (402), of the differential tooth driving rear handle (405) is hinged with one end of the differential tooth driving crank (408), and the other end of the differential tooth driving crank (408) is connected with a differential tooth driving swing shaft (410); one end of the tension spring (406) is connected with the differential tooth driving rear handle (405), and the other end of the tension spring is connected with the machine head (1).

3. The differential tooth feed mechanism of claim 1, wherein: the front transmission driving assembly comprises a differential tooth driving front crank (411), a differential tooth rocker arm crank (413), a first sliding block (412) hinged at the upper end of the differential tooth rocker arm crank (413), a differential tooth rocker shaft (414) rotatably supported in the machine head (1), a differential tooth rocker arm shaft (416) extending up and down, a single-rod arm shaft (417), a second sliding block (420) hinged at the outer peripheral side of the single-rod arm shaft (417) and a differential tooth fixing assembly (418) hinged at the lower end of the single-rod arm shaft (417); a first differential sliding groove in sliding fit with the first slider (412) is formed in the differential tooth driving front crank (411), one end, far away from the differential tooth driving front crank (411), of the differential tooth rocker arm crank (413) is fixedly connected with a differential tooth rocker shaft (414), the differential tooth rocker shaft (414) is parallel to the differential tooth driving swing shaft (410), and the differential tooth rocker arm shaft (416) is fixed in the differential tooth rocker shaft (414); a second differential sliding groove in sliding fit with a second sliding block (420) is formed in the pressure rod seat (103), the single-rod arm shaft (417) vertically penetrates through the differential tooth rocker arm shaft (416) and is in sliding connection with the pressure rod seat (103) through the second sliding block (420), and the differential tooth (419) is connected with the single-rod arm shaft (417) through the differential tooth fixing component (418).

4. A differential tooth feed mechanism as claimed in claim 3, wherein: the differential tooth lifting mechanism is characterized by further comprising a differential tooth lifting unit (6), wherein the differential tooth lifting unit (6) comprises a rear transmission lifting assembly connected with the main shaft (101), a differential tooth lifting transmission shaft (606) and a front transmission lifting assembly, one end of the differential tooth lifting transmission shaft (606) is connected with the rear transmission lifting assembly, and the other end of the differential tooth lifting transmission shaft is connected with the front transmission lifting assembly; the front transmission lifting assembly is hinged with a differential tooth fixing assembly (418); the differential tooth lifting transmission shaft (606) is rotatably supported in the handpiece (1).

5. The differential tooth feed mechanism of claim 4, wherein: back transmission lifting subassembly includes needle bar crank (601), differential tooth lifting connecting rod (602) and differential tooth lifting back crank (603), needle bar crank (601) are fixed on main shaft (101), differential tooth lifting connecting rod (602) suit is in the eccentric circle department of needle bar crank (601), crank (603) are articulated with differential tooth lifting connecting rod (602) behind the differential tooth lifting, differential tooth lifting back crank (603) keep away from the one end and the differential tooth lifting transmission shaft (606) fixed connection of differential tooth lifting connecting rod (602).

6. The differential tooth feed mechanism of claim 4, wherein: the front transmission lifting assembly comprises a differential tooth lifting front crank (605), a lifting rolling piece (608), a differential tooth lifting lever (607), an auxiliary pressure rod (609) and a guide sleeve pin (610), wherein one end of the differential tooth lifting front crank (605) is fixedly connected with a differential tooth lifting transmission shaft (606), and the other end of the differential tooth lifting front crank (605) is hinged with the lifting rolling piece (608); the auxiliary pressure lever (609) is arranged in the main pressure lever (102) in a penetrating manner, a spring reset piece (612) is arranged between the main pressure lever (102) and the auxiliary pressure lever (609), a third differential sliding groove is formed in the periphery of the main pressure lever (102), and a guide sleeve pin (610) is arranged in the third differential sliding groove in a penetrating manner and connected with the auxiliary pressure lever (609); the differential tooth lifting lever (607) is hinged on the pressure lever guide frame (104);

when the differential tooth lifting transmission shaft (606) swings, the differential tooth lifting front crank (605) drives the lifting rolling piece (608) to abut against one end of a differential tooth lifting lever (607), the differential tooth lifting lever (607) rotates around a hinge point on the pressure lever guide frame (104), and one end, far away from the lifting rolling piece (608), of the differential tooth lifting lever (607) abuts against a guide sleeve pin (610).

7. A differential sewing machine is characterized in that: the differential tooth feeding mechanism comprises the differential tooth feeding mechanism as claimed in any one of claims 1 to 6, and further comprises a presser foot lifting unit (5), wherein the presser foot lifting unit (5) comprises a presser foot lifting driving wheel (501), a rear presser foot lifting transmission assembly, a presser foot lifting pull rod (507) and a front presser foot lifting transmission assembly, the presser foot lifting driving wheel (501) is installed on the driving motor (3), the rear presser foot lifting transmission assembly is used for connecting the driving motor (3) with the presser foot lifting pull rod (507) in a transmission manner, and the front presser foot lifting transmission assembly is used for connecting the presser foot lifting pull rod (507) with the pressure rod guide frame (104) in a transmission manner.

8. The differential sewing machine of claim 7, wherein: the rear transmission assembly for lifting the presser foot comprises a rear crank (503) for lifting the presser foot, a lifting roller (502), a top rod (505) for lifting the presser foot and a rear lever (506) for lifting the presser foot, wherein the rear crank (503) for lifting the presser foot is rotatably supported in the machine head (1), one end of the rear crank (503) for lifting the presser foot is hinged with the lifting roller (502), and the other end of the rear crank (503) for lifting the presser foot is hinged with the top rod (505) for lifting the presser foot; the end part of the presser foot lifting ejector rod (505) far away from the presser foot lifting rear crank (503) is connected with a presser foot lifting pull rod (507) through a presser foot lifting rear lever (506).

9. The differential sewing machine of claim 8, wherein: the presser foot lifting front transmission assembly comprises a presser foot lifting front lever (508) and a presser foot lifting plate (509), the presser foot lifting front lever (508) is rotatably supported in the machine head (1), one end, far away from the presser foot lifting rear lever (506), of the presser foot lifting pull rod (507) is hinged to the presser foot lifting front lever (508), the presser foot lifting front lever (508) is hinged to the presser foot lifting plate (509), and the end, far away from the presser foot lifting front lever (508), of the presser foot lifting plate (509) is connected with the pressure lever guide frame (104).

10. The differential sewing machine of claim 7, wherein: the peripheral wheel surfaces of the differential tooth driving wheel (401) and the pressure raising and pressing foot driving wheel (501) comprise a reducing driving section and an equal-diameter idle stroke section; the differential tooth driving wheel (401) and the pressure raising and pressing foot driving wheel (501) are combined into an integral driving wheel which is fixed on a motor shaft of the driving motor (3); or the differential tooth driving wheel (401) and the pressure raising and pressing foot driving wheel (501) are two independent parts and are respectively fixed on a motor shaft of the driving motor (3).

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