CN217438420U - Driving mechanism for thread trimming and presser foot lifting of sewing machine - Google Patents

Abstract

The utility model provides a sewing machine trimming lifts actuating mechanism of presser foot belongs to sewing machine technical field. The thread trimming and presser foot lifting driving mechanism solves the problems that the conventional thread trimming and presser foot lifting driving mechanism is inconvenient to maintain and operate after being arranged on a sewing machine. This actuating mechanism of presser foot is lifted in sewing machine trimming, sewing machine includes the casing and sets up the presser foot axle of lifting in the casing, lift the epaxial fixedly connected with crank of presser foot, actuating mechanism is including fixing the motor on the casing lateral surface, the pivot of motor is fixed with the cam, it has the sliding hole to run through on the conch wall of casing, sliding contact cooperation has the slide bar in the sliding hole, the outer end of slide bar supports and leans on the profile surface of cam, the inner of slide bar supports and leans on the crank and can drive the crank around lifting the axis rotation of presser foot axle. Compare and utilize the pendulum rod directly to lean on with the cam formation in current actuating mechanism, this actuating mechanism sets up behind the slide bar, has improved the convenience of sewing machine routine maintenance operation.

Description

Driving mechanism for thread trimming and presser foot lifting of sewing machine

Technical Field

The utility model belongs to the technical field of sewing machine, a sewing machine trimming lifts actuating mechanism of presser foot is related to.

Background

The sewing machine is a machine for sewing materials by sewing threads, and comprises a needle rod mechanism, a thread take-up mechanism, a feeding mechanism, a thread hooking mechanism, a pressing mechanism, a winding device, a lubricating device and the like. In order to improve the processing efficiency, the existing sewing machine is also provided with a thread trimming mechanism and a presser foot lifting mechanism for realizing automatic thread trimming and automatic presser foot lifting.

Chinese patent literature data discloses a driving mechanism for thread trimming and presser foot lifting of a flat seaming machine [ application number: CN 202122556241.2; the notice number is: CN 216040168U ], including a motor fixed on the casing, a driving member fixed on the rotating shaft of the motor, and a swing link fixed on the presser foot shaft. The motor is arranged along the vertical direction, the motor rotating shaft is provided with an upper end and a lower end, the driving piece comprises a first cam fixed at the upper end of the motor rotating shaft and a second cam fixed at the lower end of the motor rotating shaft, and the top of the first cam is provided with a first cam surface which is abutted against the swing rod and can push the swing rod to swing upwards when the first cam rotates.

Because motor and cam are all fixed in the outside of casing, and the presser foot axle sets up in the casing inner chamber, in order to make the pendulum rod can support with cam one contact formation and lean on, seted up movable logical groove on the shell arm of casing, the pendulum rod is worn to establish in the movable logical groove, and the inner of pendulum rod is fixed with the presser foot axle, and the wobbling outer end supports with cam one and leans on. In order to make the pendulum rod swing smoothly in the activity through groove, avoid the cell wall that the activity leads to the groove to cause the interference to the swing of pendulum rod, the space that needs the activity to lead to the groove is enough big, just so lead to the inner chamber of casing and external world to be in the connected state through the activity through groove, and external debris enters into the casing inner chamber through the activity through groove very easily, and sewing machine's a lot of mechanisms all set up in the casing inner chamber, debris not only can gather near the activity through groove after entering into the casing inner chamber, and can constantly diffuse inwards, cause the threat to the operation of these mechanisms in the casing inner chamber easily, consequently need in time clear up these debris that enter into the casing by the activity through groove when sewing machine routine maintenance. And the interior mechanism of the shell is various and the layout is compact, so that the positions needing to be cleaned are more, the space for cleaning operation is small, and the daily maintenance operation of the sewing machine is inconvenient.

SUMMERY OF THE UTILITY MODEL

The utility model aims at the above-mentioned problem that prior art exists, provide a sewing machine trimming and lift actuating mechanism of presser foot, solved current trimming and lifted presser foot actuating mechanism and set up the technical problem that the back leads to sewing machine routine maintenance operation inconvenient on sewing machine.

The purpose of the utility model can be realized by the following technical proposal:

a driving mechanism for a trimming and presser foot lifting of a sewing machine comprises a machine shell and a presser foot lifting shaft arranged in the machine shell, wherein a crank is fixedly connected to the presser foot lifting shaft, the driving mechanism comprises a motor fixed on the outer side surface of the machine shell, and a cam is fixed to a rotating shaft of the motor.

The presser foot lifting shaft is connected with a presser foot lifting assembly of the sewing machine. When the driving mechanism works, the motor rotates in a reciprocating way to drive the cam to rotate in a reciprocating way; in the reciprocating rotation process of the cam, the profile surface of the cam acts on the sliding rod and drives the sliding rod to slide in the sliding hole in a reciprocating mode, and the inner end of the sliding rod abuts against the crank, the crank is fixed on the presser foot lifting shaft, and the presser foot lifting shaft rotates along with the sliding of the sliding rod, so that the presser foot lifting assembly is driven to move to achieve lifting of the presser foot. Because the sliding rod is in sliding contact with the sliding hole, sundries are blocked outside the machine shell, the sundries in the machine shell do not need to be cleaned during the daily maintenance of the sewing machine, only the sundries outside the sliding rod need to be cleaned, and the cam and the outer end of the sliding rod are not provided with other barriers, so that the cleaning is very convenient. Therefore, compare in utilizing the pendulum rod directly to lean on with the cam formation among the current actuating mechanism, this actuating mechanism sets up behind the slide bar, has improved the convenience of sewing machine routine maintenance operation.

In the above driving mechanism for the thread trimming and presser foot lifting of the sewing machine, the shaft sleeve is fixed in the sliding hole, the sliding rod includes the sliding portion arranged corresponding to the shaft sleeve, and the sliding portion is arranged in the shaft sleeve in a penetrating manner and forms sliding contact fit. The machining precision of axle sleeve is high, compares in and directly forms sliding contact cooperation with the slide bar with the sliding hole, and the setting of axle sleeve can reduce the friction and wear of slide bar, makes the slide bar slide smoothly in the axle sleeve.

In the driving mechanism for the thread trimming and presser foot lifting of the sewing machine, the inner end hole of the sliding hole extends inwards to form an inner convex cylinder, the outer end hole of the sliding hole extends outwards to form an outer convex cylinder, a baffle is arranged on the inner side of the shaft sleeve on the inner convex cylinder, a convex shoulder is arranged on the sliding part, a small hole is formed in the baffle, and the inner end of the sliding rod penetrates through the small hole.

The length of the sliding hole is prolonged by the inner convex cylinder and the outer convex cylinder, so that the sliding rod can stably slide in the sliding hole. The baffle plate is matched with the convex shoulder to have a limiting effect, so that the sliding rod can be prevented from sliding inwards to pass the position. Meanwhile, the shaft sleeve and the baffle form a secondary shielding effect, so that sundries are prevented from entering the shell through the sliding hole, and the sewing machine is convenient to maintain and operate.

In the driving mechanism for the thread trimming and presser foot lifting of the sewing machine, the inner end of the sliding rod is provided with a hemispherical ball head part abutted against the crank, and the outer end of the sliding rod is provided with a rotatable rolling sleeve abutted against the cam profile surface. The ball head part and the crank form point contact, and the rolling sleeve and the cam form rolling friction, so that the friction and the abrasion can be reduced, and the service life of the sliding rod is prolonged.

In the driving mechanism for the thread trimming and presser foot of the sewing machine, the sewing machine further comprises a thread trimming assembly, a sliding frame is further fixed on the outer side surface of the machine shell, a slidable thread trimming shaft connected with the thread trimming assembly penetrates through the sliding frame, a rotating shaft of the motor is further fixedly connected with a shifting rod, the shifting rod comprises a driving part extending towards the direction far away from the machine shell, a shifting part arranged corresponding to the driving part is fixed on the thread trimming shaft, and the driving part can abut against the shifting part to drive the thread trimming shaft to slide on the sliding frame; the profile surface of the cam comprises a base surface and a driving surface, when the driving part is abutted against the shifting piece, the outer end of the sliding rod is abutted against the base surface, and when the outer end of the sliding rod is abutted against the driving surface, the driving part is separated from the shifting piece.

When the driving mechanism works, the motor rotates to drive the cam and the shifting lever to synchronously rotate. When the motor rotates to enable the driving part to abut against the shifting piece to drive the shifting piece to slide, the thread cutting assembly cuts threads, the sliding rod abuts against the base surface at the moment, and the presser foot lifting assembly is fixed; when the motor rotates to enable the driving surface of the cam to abut against the sliding rod, the cam drives the sliding rod to slide, the sliding rod drives the crank to rotate, the presser foot lifting component acts to lift the presser foot, the driving portion of the shifting rod is separated from the shifting component, and the thread trimming component is fixed. Just so can realize that a motor both controls the trimming and controls and lift the presser foot, compare in setting up two driving sources and control the trimming respectively and lift the presser foot, can simplify the structure, reduce cost reduces the fault rate.

Because the driving part of the shifting rod extends towards the direction far away from the shell and is matched with the shifting piece to form a kinematic pair, the interference of the shell and other parts on maintenance operation is reduced in the process of carrying out daily maintenance (adding lubricating grease or cleaning sundries) on the kinematic pair. Therefore, compared with a second cam and a connecting rod assembly which are arranged in the prior art, the shifting rod and the shifting piece which are arranged in the thread cutting and presser foot lifting driving mechanism improve the convenience of daily maintenance operation, reduce parts between the motor and the thread cutting shaft, simplify the structure and facilitate the assembly of the driving mechanism.

In the driving mechanism for the thread trimming and presser foot lifting of the sewing machine, the deflector rod is located between the motor shell and the sliding frame, a through hole is formed in the sliding frame, the thread trimming shaft penetrates through the through hole and can slide, a sliding groove parallel to the thread trimming shaft is further formed in the sliding frame, and a sliding block which is embedded into the sliding groove and can slide along the sliding groove is arranged on the poking piece.

The cooperation of spout and slider has the guide effect, and the spout is parallel with the shear-line axle, makes the whole of dialling the fixed formation of piece and shear-line axle receive the fenestrate guide effect of spout and installation piece simultaneously, makes and dials the piece and shear-line axle stability of sliding on the carriage, is favorable to guaranteeing going on smoothly of trimming action. Meanwhile, the matching of the sliding groove and the sliding block has a circumferential limiting effect on the thread-cutting shaft, so that the thread-cutting shaft is prevented from rotating in the through hole.

In the driving mechanism for the thread cutting and presser foot lifting of the sewing machine, the sliding frame is provided with a mounting groove, part of the shaft lever of the thread cutting shaft and one end, fixed with the thread cutting shaft, of the stirring piece are both positioned in the mounting groove, the thread cutting shaft is sleeved with a spring, the spring is positioned in the mounting groove, two ends of the spring are respectively abutted against the side wall of the mounting groove and the stirring piece, and the driving part and the spring are respectively positioned on two sides of the stirring piece.

When the shifting rod rotates towards one side close to the spring, the driving portion abuts against the shifting piece to drive the shifting piece to approach the spring, the thread cutting shaft slides to drive the thread cutting assembly to cut threads, and meanwhile the spring is compressed and stores compression potential energy. After the sewing thread is cut off, when the deflector rod rotates in the reverse direction (namely, rotates towards the side far away from the spring), the elastic force generated by the spring drives the thread cutting shaft to slide in the reverse direction, and the thread cutting assembly moves in the reverse direction and resets. The spring is arranged in the mounting groove of the mounting block, so that the spring and the shifting rod are mutually separated and far away, the spring and the shifting rod do not interfere with the daily maintenance operation, and the daily maintenance operation is convenient.

In the driving mechanism for the thread trimming and presser foot lifting of the sewing machine, the motor is vertically arranged, the deflector rod is fixedly connected to the lower end of the rotating shaft of the motor, and the cam is fixedly connected to the upper end of the rotating shaft of the motor.

The shifting rod and the cam are separately arranged at two ends of the motor rotating shaft, interference between the shifting rod and the cam is avoided, sundries are conveniently cleaned, lubricating grease is conveniently added, and convenience is brought to daily maintenance and operation.

In the driving mechanism for the thread trimming and presser foot lifting of the sewing machine, the poking piece is provided with the rotatable roller, and the driving part can abut against the outer side surface of the roller. The rolling wheel and the deflector rod form a rolling friction pair, so that friction and abrasion can be reduced, consumption of lubricating grease can be reduced, and the adding times of the lubricating grease are reduced.

In the driving mechanism for the thread trimming and presser foot lifting of the sewing machine, the outer side surface of the machine shell is provided with the accommodating groove, the lower end of the motor shell is fixed in the accommodating groove, the upper end of the motor shell extends out of the accommodating groove, the two ends of the motor shell are respectively fixed with the upper fixing frame and the lower fixing frame, one end of the lower fixing frame, which faces the bottom surface of the accommodating groove, is fixedly connected with the bottom surface of the accommodating groove, and the driving part of the driving lever extends out of the accommodating groove.

The lower fixing frame is fixed with the bottom surface of the containing groove, so that the driving part of the shifting rod cannot be shielded, the shifting rod and the shifting part kinematic pair cannot be hindered in daily maintenance operation, and the daily maintenance operation is convenient.

Compared with the prior art, the utility model has the advantages of it is following:

the shell wall of the shell is provided with a sliding hole, a sliding rod is matched in the sliding hole in a sliding contact mode, and two ends of the sliding rod are abutted against the crank and the cam respectively to block sundries outside the shell, so that the daily maintenance operation of the sewing machine is facilitated. The driving rod is fixed to one end of the motor rotating shaft, the driving portion extending out in the direction far away from the shell is arranged on the driving rod, the poking piece corresponding to the driving portion is fixed to the shear wire shaft, the driving portion of the driving rod can drive the poking piece to slide along with the shear wire shaft when abutting against the poking piece, the obstruction of the shell and other parts to the driving rod and the poking piece moving pair daily maintenance operation is reduced, and the convenience of the daily maintenance operation is improved. The driving lever is arranged between the sliding frame and the motor shell, and is convenient for daily maintenance operation. The sliding frame is provided with a sliding chute, and the stirring piece is provided with a sliding block, so that the stirring piece and the shear wire shaft can slide stably. The deflector rod and the cam are fixed on the rotating shaft of the motor, so that the wire shearing and the presser foot lifting can be controlled by one motor simultaneously, the structure can be simplified, and the cost can be reduced.

Drawings

FIG. 1 is a perspective view of the present drive mechanism as installed in a sewing machine;

FIG. 2 is a top plan view of the present drive mechanism as installed in a sewing machine;

FIG. 3 is a perspective view of the present drive mechanism;

FIG. 4 is an exploded perspective view of the present drive mechanism;

FIG. 5 is a view showing the positional relationship between the cam and the shift lever in the present driving mechanism;

fig. 6 is a sectional view at the slide lever in the present drive mechanism.

In the figure, 1, a housing; 1a, accommodating grooves; 1b, a sliding hole; 1c, a convex cylinder; 1d, an inner convex cylinder; 1e, a baffle plate; 1f, small holes; 2. a thread trimming assembly; 3. a motor; 3a, a rotating shaft; 4. a carriage; 4a, a chute; 4b, punching; 4c, mounting grooves; 5. a deflector rod; 5a, a driving part; 6. a toggle piece; 6a, a roller; 6b, a sliding block; 7. a spring; 8. a slide bar; 8a, a sliding part; 8b, a shoulder; 8c, a ball head portion; 8d, rolling a sleeve; 9. a cam; 9a, a contour surface; 9a1, base surface; 9a2, drive face; 10. lifting the presser foot shaft; 11. a crank; 12. an upper fixing frame; 13. a lower fixing frame; 14. a thread cutting shaft; 15. and a shaft sleeve.

Detailed Description

The following are specific embodiments of the present invention and the accompanying drawings are used to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

Example one

As shown in fig. 1-4, the sewing machine includes a machine shell 1, a presser foot lifting assembly and a thread trimming assembly 2, and the reference to CN 215440947U patent document is made for the presser foot lifting assembly and the thread trimming assembly 2. A driving mechanism for thread trimming and presser foot lifting of a sewing machine is arranged on a machine shell 1 of the sewing machine and comprises a motor 3 and a sliding frame 4 which are fixed on the outer side surface of the machine shell 1. Be provided with holding tank 1a on the trailing flank of casing 1, the vertical setting of motor 3, and the lower extreme fixed connection of motor 3 is in holding tank 1 a. The motor 3 is a double-head motor 3, and the upper end and the lower end of a rotating shaft 3a of the motor 3 extend out of the shell of the motor 3. An upper fixing frame 12 and a lower fixing frame 13 are respectively fixed at two ends of the shell of the motor 3, the lower fixing frame 13 is fixed in the accommodating groove 1a, and one end, facing the bottom surface of the accommodating groove 1a, of the lower fixing frame 13 is fixedly connected with the bottom surface of the accommodating groove 1 a. The upper fixing frame 12 is of an L shape and comprises an upper horizontal portion and an upper vertical portion, the upper vertical portion is arranged upwards, a notch is formed in the upper vertical portion, the upper horizontal portion is fixedly connected with the motor 3 shell, and the upper vertical portion is attached to the outer side face of the machine shell 1 and is fixedly connected with the machine shell 1 through a fixing bolt. Lower mount 13 also is the L type, including lower horizontal portion and lower vertical portion, lower vertical portion sets up down, lower horizontal portion and motor 3 casing fixed connection, and lower vertical portion pastes and leans on the bottom surface of holding tank 1a and through fixing bolt and casing 1 fixed connection.

As shown in fig. 1 to 4, a sliding cutting spool 14 connected to the cutting wire assembly 2 is inserted into the carriage 4. The sliding frame 4 is located below the motor 3, the lower end of a rotating shaft 3a of the motor 3 is fixedly connected with a shifting lever 5, the shifting lever 5 is perpendicular to the rotating shaft 3a of the motor 3, and the shifting lever 5 is located between a shell of the motor 3 and the sliding frame 4. The shift lever 5 includes a driving portion 5a extending away from the housing 1, and the driving portion 5a extends out of the accommodating groove 1 a. A toggle piece 6 arranged corresponding to the driving part 5a is fixed on the cutting-line shaft 14, and the driving part 5a can abut against the toggle piece 6 to drive the cutting-line shaft 14 to slide on the sliding frame 4. The vertical setting of carriage 4, carriage 4 pass through bolt or screw fixed connection on casing 1, and carriage 4 both sides have the fixed part respectively, and bolt or screw are worn to be equipped with by the fixed part. The wire cutting shaft 14 penetrates through the upper end of the sliding frame 4, a through hole 4b is formed in the upper end of the sliding frame 4, the wire cutting shaft 14 penetrates through the through hole 4b and can slide, and the right end of the wire cutting shaft 14 extends out of the sliding frame 4 and then is connected with the wire cutting assembly 2. The upper end of the sliding frame 4 is also provided with a mounting groove 4c, and part of the shaft lever of the cutting-line shaft 14 and one end of the poking piece 6 fixed with the cutting-line shaft 14 are both positioned in the mounting groove 4 c. The cutting spool 14 is sleeved with a spring 7, the spring 7 is positioned in the mounting groove 4c, two ends of the spring 7 respectively abut against the side wall of the mounting groove 4c and the toggle piece 6, and the driving part 5a and the spring 7 are respectively positioned at two sides of the toggle piece 6. In the figure, the driving portion 5a is located on the right side of the dial 6, and the spring 7 is located on the left side of the dial 6. The upper end of the sliding frame 4 is also provided with a sliding chute 4a which is arranged in parallel with the shearing bobbin 14, the sliding chute 4a is positioned between the shearing bobbin 14 and the machine shell 1, and the poking piece 6 is provided with a sliding block 6b which is embedded into the sliding chute 4a and can slide along the sliding chute 4 a. The stirring piece 6 is blocky, the sliding block 6b is arranged on the rear side face of the stirring piece 6, the lower end of the stirring piece 6 is fixedly connected to the shearing spool 14 and is located in the mounting groove 4c, the rotatable roller 6a is installed at the upper end of the stirring piece 6, the rolling shaft of the roller 6a is vertically arranged and faces upwards, and the driving portion 5a can abut against the outer side face of the roller 6 a.

As shown in fig. 1-5, a cam 9 capable of driving the presser foot lifting assembly to move is fixed on the upper end of the rotating shaft 3a of the motor 3. The cam 9 has a contour surface 9a on the outer surface thereof, and the cam 9 has a substantially fan shape. The profile surface 9a of the cam 9 comprises a base surface 9a1 and a driving surface 9a2, wherein the base surface 9a1 is in a circular arc shape and is closest to the rotating shaft of the cam 9, the driving surface 9a2 is positioned at the right side of the base surface 9a1, the driving surface 9a2 is obliquely arranged, and the radius of the driving surface 9a2 is gradually increased in a direction away from the base surface 9a 1. In this embodiment, the cam 9 has a symmetrical structure, that is, the driving surfaces 9a2 are provided on both sides of the base surface 9a1, so that the position of the driving surface 9a2 does not need to be distinguished when the cam 9 is installed, and the installation of the cam 9 is facilitated. A rotatable presser foot lifting shaft 10 penetrates through the machine shell 1, the presser foot lifting shaft 10 is positioned in the machine shell 1, and the presser foot lifting shaft 10 is connected with the presser foot lifting assembly. For the mounting structure of the presser foot shaft 10 on the housing 1 and the connecting structure of the presser foot shaft 10 and the presser foot assembly, reference is made to CN 215440947U patent document. A crank 11 is fixed on the pressure foot lifting shaft 10, one end of the crank 11 is fixed on the pressure foot lifting shaft 10, and the other end of the crank 11 is close to the motor 3 and faces downwards.

As shown in fig. 1 and 6, a sliding hole 1b penetrates through the wall of the housing 1, a sliding rod 8 is slidably engaged in the sliding hole 1b, the outer end of the sliding rod 8 abuts against the contour surface 9a of the cam 9, and the inner end of the sliding rod 8 abuts against the crank 11 and can drive the crank 11 to rotate around the axis of the presser foot lifting shaft 10. A shaft sleeve 15 is fixed in the sliding hole 1b, the sliding rod 8 comprises a sliding part 8a which is arranged corresponding to the shaft sleeve 15, and the sliding part 8a is arranged in the shaft sleeve 15 in a penetrating way and forms sliding contact fit. The size between the sleeve 15 and the sliding part 8a is a shaft hole clearance fit. The arrangement of the shaft sleeve 15 can reduce the friction and abrasion of the sliding rod 8, so that the sliding rod 8 can smoothly slide in the shaft sleeve 15. In order to simplify the structure, the sleeve 15 may not be used, and the size between the slide hole 1b and the slide portion 8a may be a shaft hole clearance fit, and the slide hole 1b and the slide portion 8a may be in a sliding contact fit. The inner end hole of the sliding hole 1b extends inwards to form an inner convex cylinder 1d, and the outer end hole of the sliding hole 1b extends outwards to form an outer convex cylinder 1 c. The outer end of the outer cylinder 1c and the sliding rod 8 are located in the gap of the upper fixing frame 12. A baffle plate 1e is arranged on the inner side of the shaft sleeve 15 on the inner convex cylinder 1d, a convex shoulder 8b is arranged on the sliding part 8a, a small hole 1f is formed in the baffle plate 1e, and the inner end of the sliding rod 8 penetrates through the small hole 1 f. The inner end of the sliding rod 8 is provided with a spherical head part 8c which is in a hemispherical shape and is abutted against the crank 11, and the outer end of the sliding rod 8 is provided with a rotatable roller 8d which is abutted against the contour surface 9a of the cam 9. The rolling shaft of the roller 8d is vertically arranged and fixed on the outer end of the sliding rod 8, and the outer side surface of the roller is abutted against the profile surface 9a of the cam 9. The roller 8d on the slide lever 8 abuts against the base surface 9a1 when the drive section 5a abuts against the dial 6, and the drive section 5a is separated from the dial 6 when the roller 8d on the slide lever 8 abuts against the drive surface 9a 2.

As shown in fig. 5 and 2, the rotation of the rotating shaft 3a of the motor 3 can drive the cam 9 and the shift lever 5 to rotate synchronously. When the rotating shaft 3a of the motor 3 rotates clockwise as seen in fig. 2, the shift lever 5 and the cam 9 rotate clockwise synchronously, the driving portion 5a of the shift lever 5 abuts against the shift member 6 to drive the shift member 6 and the trimming shaft 14 to slide leftwards, the spring 7 is compressed, the trimming assembly 2 acts to trim, the roller sleeve 8d on the sliding rod 8 abuts against the base surface 9a1 of the contour surface 9a of the cam 9 in the process, and the presser foot is in a lowering state and presses the cloth. After trimming, the rotating shaft 3a of the motor 3 rotates anticlockwise, the shifting lever 5 and the cam 9 rotate anticlockwise synchronously, under the action of the elastic force of the spring 7, the shifting piece 6 and the trimming shaft 14 slide rightwards, at the moment, the shifting piece 6 is also abutted against the driving part 5a of the shifting lever 5 under the action of the elastic force of the spring 7, until the spring 7 is restored to a natural state or the shifting piece 6 is abutted against the right side wall of the mounting groove 4c, the trimming assembly 2 is reset, in the process, the rolling sleeve 8d on the sliding rod 8 is still abutted against the base surface 9a1 of the profile surface 9a of the cam 9, and the presser foot is in a lowering state and compresses cloth. After the spring 7 is restored to the natural state or the toggle piece 6 abuts against the right side wall of the mounting groove 4c, the rotating shaft 3a of the motor 3 continues to rotate anticlockwise, the toggle rod 5 and the cam 9 rotate anticlockwise synchronously, the toggle rod 5 is separated from the toggle piece 6 and continuously separated, as the driving surface 9a2 is on the right side of the base surface 9a1, the roller sleeve 8d on the sliding rod 8 abuts against the driving surface 9a2 of the contour surface 9a of the cam 9, the sliding rod 8 is driven by the driving surface 9a2 and slides inwards, and the sliding rod 8 pushes the crank 11 to rotate, so that the presser foot is lifted. After the presser foot is lifted, the rotating shaft 3a of the motor 3 rotates clockwise, the deflector rod 5 and the cam 9 rotate clockwise synchronously, the deflector rod 5 and the toggle piece 6 are continuously close, the roller sleeve 8d on the sliding rod 8 abuts against the driving surface 9a2 of the profile surface 9a of the cam 9, the sliding rod 8 slides outwards until the roller sleeve 8d on the sliding rod 8 returns to the base surface 9a1 again, the presser foot lifting assembly is reset, and the presser foot is lowered and pressed on the cloth. Therefore, when the driving mechanism drives the thread trimming component 2 to trim threads, the presser foot lifting component is in a downward placing state and is not moved, and when the presser foot lifting component is driven to lift the presser foot, the thread trimming component 2 is not moved. Therefore, the purpose that one motor 3 controls both trimming and presser foot lifting is achieved, and compared with the mode that two driving sources are arranged to respectively control trimming and presser foot lifting, the structure can be simplified, the cost is reduced, and the failure rate is reduced.

Because slide bar 8 and sliding hole 1b sliding contact cooperation, debris are blockked in the casing 1 outside, need not clear up the interior debris of casing 1 when sewing machine routine maintenance, only need clear up the debris in the slide bar 8 outside can, cam 9 does not set up other blockages with 8 outer ends of slide bar department in addition, and the clearance is got up also very conveniently. Therefore, compared with the prior driving mechanism which directly forms a connecting structure with the cam 9 by utilizing the swing rod, the driving mechanism is provided with the sliding rod 8, and the convenience of daily maintenance operation of the sewing machine is improved. And because the driving part 5a of the deflector rod 5 extends towards the direction far away from the machine shell 1, and the driving part 5a and the deflector 6 are matched to form a kinematic pair, the interference of the machine shell 1 and other parts on maintenance operation is reduced in the process of carrying out daily maintenance [ adding lubricating grease or cleaning sundries ] on the kinematic pair. Therefore, compared with a second cam and a connecting rod assembly arranged in the prior art, the shifting rod 5 and the shifting piece 6 arranged in the trimming and pressing foot lifting driving mechanism further improve the convenience of daily maintenance operation, and parts between the motor 3 and the trimming shaft 14 are reduced, so that the driving mechanism is simple in structure and convenient to assemble.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications, additions and substitutions for the specific embodiments described herein may be made by those skilled in the art without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.

Claims (10)

1. The utility model provides a sewing machine trimming lifts actuating mechanism of presser foot, sewing machine include casing (1) and set up in casing (1) lift presser foot axle (10), lift fixedly connected with crank (11) on presser foot axle (10), actuating mechanism is including fixing motor (3) on casing (1) lateral surface, pivot (3a) of motor (3) are fixed with cam (9), characterized in that, run through on the conch wall of casing (1) sliding hole (1b), sliding contact cooperation has slide bar (8) in sliding hole (1b), the outer end of slide bar (8) supports and leans on profile surface (9a) of cam (9), the inner of slide bar (8) supports and leans on crank (11) and can drive crank (11) and lift the axis rotation of presser foot axle (10).

2. The driving mechanism for the trimming and presser foot of the sewing machine according to claim 1, wherein a bushing (15) is fixed in the sliding hole (1b), the sliding rod (8) comprises a sliding portion (8a) corresponding to the bushing (15), and the sliding portion (8a) is inserted in the bushing (15) and forms a sliding contact fit.

3. The driving mechanism for the thread trimming and presser foot lifting of the sewing machine according to claim 2, wherein an inner end hole of the sliding hole (1b) extends inwards to form an inner convex cylinder (1d), an outer end hole of the sliding hole (1b) extends outwards to form an outer convex cylinder (1c), a baffle (1e) is arranged on the inner convex cylinder (1d) and positioned on the inner side of the shaft sleeve (15), the sliding part (8a) is provided with a convex shoulder (8b), the baffle (1e) is provided with a small hole (1f), and the inner end of the sliding rod (8) penetrates through the small hole (1 f).

4. The driving mechanism for the thread trimming and presser foot lifting of sewing machine according to any one of claims 1 to 3, wherein the inner end of the sliding rod (8) has a spherical head portion (8c) in a hemispherical shape and abutted against the crank (11), and the outer end of the sliding rod (8) is provided with a rotatable roller (8d) abutted against the contour surface (9a) of the cam (9).

5. The driving mechanism for the thread trimming and presser foot lifting of the sewing machine according to any one of claims 1 to 3, wherein the sewing machine further comprises a thread trimming assembly (2), a sliding frame (4) is further fixed on the outer side surface of the machine shell (1), a slidable thread trimming shaft (14) connected with the thread trimming assembly (2) penetrates through the sliding frame (4), a shifting rod (5) is further fixedly connected with a rotating shaft (3a) of the motor (3), the shifting rod (5) comprises a driving part (5a) extending towards the direction away from the machine shell (1), a shifting member (6) arranged corresponding to the driving part (5a) is fixed on the thread trimming shaft (14), and the driving part (5a) can abut against the shifting member (6) to drive the thread trimming shaft (14) to slide on the sliding frame (4); the profile surface (9a) of the cam (9) comprises a base surface (9a1) and a driving surface (9a2), the outer end of the sliding rod (8) abuts against the base surface (9a1) when the driving part (5a) abuts against the toggle piece (6), and the driving part (5a) is separated from the toggle piece (6) when the outer end of the sliding rod (8) abuts against the driving surface (9a 2).

6. The driving mechanism for the trimming and presser foot of the sewing machine according to claim 5, wherein the deflector rod (5) is located between the housing of the motor (3) and the sliding frame (4), the sliding frame (4) is provided with a through hole (4b), the trimming shaft (14) is inserted into the through hole (4b) and can slide, the sliding frame (4) is further provided with a sliding groove (4a) which is parallel to the trimming shaft (14), and the deflector (6) is provided with a sliding block (6b) which is embedded into the sliding groove (4a) and can slide along the sliding groove (4 a).

7. The driving mechanism for the thread cutting and presser foot lifting of the sewing machine according to claim 5, wherein the sliding frame (4) is provided with a mounting groove (4c), a part of the shaft rod of the thread cutting shaft (14) and one end of the toggle member (6) fixed with the thread cutting shaft (14) are both positioned in the mounting groove (4c), the thread cutting shaft (14) is sleeved with a spring (7), the spring (7) is positioned in the mounting groove (4c), two ends of the spring (7) respectively abut against the side wall of the mounting groove (4c) and the toggle member (6), and the driving part (5a) and the spring (7) are respectively positioned at two sides of the toggle member (6).

8. The driving mechanism for the thread trimming and presser foot lifting of a sewing machine as claimed in claim 5, wherein said motor (3) is vertically disposed, said lever (5) is fixedly connected to the lower end of the rotating shaft (3a) of the motor (3), and said cam (9) is fixedly connected to the upper end of the rotating shaft (3a) of the motor (3).

9. The driving mechanism for the trimming and presser foot of the sewing machine according to claim 5, wherein the poking member (6) is provided with a rotatable roller (6a), and the driving part (5a) can abut against the outer side surface of the roller (6 a).

10. The driving mechanism for the thread trimming and presser foot lifting of the sewing machine according to claim 8, wherein an accommodating groove (1a) is provided on an outer side surface of the housing (1), a lower end of the housing of the motor (3) is fixed in the accommodating groove (1a), an upper end of the housing of the motor (3) extends out of the accommodating groove (1a), an upper fixing frame (12) and a lower fixing frame (13) are respectively fixed on two ends of the housing of the motor (3), one end of the lower fixing frame (13) facing to the bottom surface of the accommodating groove (1a) is fixedly connected with the bottom surface of the accommodating groove (1a), and a driving portion (5a) of the deflector rod (5) extends out of the accommodating groove (1 a).

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