CN215251626U - Adjusting device and sewing machine - Google Patents

Abstract

The utility model provides an adjusting device and a sewing machine, wherein the adjusting device is used for adjusting the states of a thread trimming cutter and a feed dog in the sewing machine and comprises a driving component, a thread trimming adjusting mechanism and a tooth frame adjusting mechanism; the driving member is connected with the power output end of the driving source and comprises a first driving part and a second driving part which can rotate along with the movement of the driving source; the first driving part and the trimming adjusting mechanism form follow-up fit and are used for driving the trimming adjusting mechanism to act so as to drive the trimming knife to act; and the second driving part and the tooth rack adjusting mechanism form follow-up fit and are used for driving the tooth rack adjusting mechanism to act so as to change the position of the feed dog. The first driving part and the second driving part which are connected with the driving source in a follow-up mode realize independent switching adjustment of the thread trimmer and the feed dog frame, the adjusting device can obviously reduce the number of driving parts in the sewing machine, the structure and arrangement of the transmission parts are simplified, the size and the weight of the sewing machine can be reduced, and the production and transportation cost of the sewing machine can be reduced.

Description

Adjusting device and sewing machine

Technical Field

The utility model relates to a sewing technical field especially relates to an adjusting device and sewing machine.

Background

A plurality of motion mechanisms, such as a thread cutting mechanism and a cloth feeding mechanism, for performing different functions are generally integrated into a sewing machine, and the sewing machine performs a sewing operation by the coordination of the motion mechanisms.

The main function of the thread cutting mechanism is to generate reciprocating motion and drive the thread cutting knife to be continuously switched between a cutter outlet state and a cutter collecting state, so that the thread is continuously hooked and cut off; the main function of the cloth feeding mechanism is to generate reciprocating motion and continuously jack up and drag the cloth on the needle plate through the cloth feeding teeth, so that the cloth is continuously conveyed to the machine head.

The existing sewing machine is respectively provided with different adjusting mechanisms for the functional mechanisms, so that the structures of a driving part and a transmission part in the sewing machine tend to be complex, the occupied space is large, the volume and the weight of the sewing machine are increased, the transportation cost of the sewing machine is increased, and the increased driving part also causes the production cost of the sewing machine to be increased.

SUMMERY OF THE UTILITY MODEL

In view of the above, the present invention provides an adjusting device for adjusting states of a thread trimming cutter and a feed dog in a sewing machine, the adjusting device including a driving member, a thread trimming adjusting mechanism and a thread guide adjusting mechanism; the driving member is connected with the power output end of the driving source and comprises a first driving part and a second driving part which can rotate along with the movement of the driving source; the first driving part and the trimming adjusting mechanism form follow-up fit and are used for driving the trimming adjusting mechanism to act so as to drive the trimming knife to act; and the second driving part and the tooth rack adjusting mechanism form follow-up fit and are used for driving the tooth rack adjusting mechanism to act so as to change the position of the feed dog.

In one embodiment, the driving member includes a first cam and a second cam fixed relatively, and the first driving portion and the second driving portion are respectively and correspondingly disposed on the first cam and the second cam; the first cam and the second cam are connected to a power output end of the driving source and can synchronously rotate under the driving of the driving source.

So set up, adjusting device has realized the power distribution to trimming adjustment mechanism and tooth frame adjustment mechanism through cam drive to improved trimming adjustment mechanism and tooth frame adjustment mechanism to drive component power output's response speed and sensitive degree, therefore adjusting device's regulation efficiency is higher, the action switches faster, is favorable to reducing sewing operation error or postpones, improves sewing quality.

In one embodiment, the first driving part comprises a trimming driving area and a cutting position holding area, wherein the trimming driving area is smoothly connected with the cutting position holding area and is provided with a cutting position relatively close to the cutting position holding area and a cutting position relatively far away from the cutting position holding area; the driving radius of the trimming driving area is increased from the cutter retracting point to the cutter discharging point, and the driving radius of the cutter retracting position maintaining area is consistent with that of the cutter retracting point; the trimming adjusting mechanism is connected with the trimming knife, and when the matching position of the trimming driving area and the trimming adjusting mechanism is transferred from the knife retracting position to the knife discharging position, the trimming adjusting mechanism moves and drives the trimming knife to switch from the knife retracting state to the knife discharging state; when the cutter retracting position holding area and the thread cutting adjusting mechanism form follow-up matching, the thread cutting adjusting mechanism enables the thread cutting cutter to keep a cutter retracting state.

According to the arrangement, the shape of the trimming driving area corresponds to the motion state and position of the trimming knife, and even if the trimming adjusting mechanism operates for multiple times, the trimming knife can still be ensured to have the fixed knife discharging position and the fixed knife collecting position and the fixed knife discharging and collecting stroke, so that the consistency of trimming and hooking actions in each action is ensured; when the cutter retracting position holding area is matched with the thread cutting adjusting mechanism in a follow-up mode, the thread cutting adjusting mechanism can be fixed relative to the sewing machine frame, and then the thread cutting cutter is kept fixed at the cutter retracting position.

In one embodiment, the thread trimming adjusting mechanism comprises a first swinging piece and a first sliding piece, the first swinging piece is in rolling contact with the first driving part to form follow-up fit and is movably connected with the first sliding piece, and the first sliding piece is in sliding fit with the sewing machine frame and is connected with the thread trimming knife; when the matching position of the trimming driving area and the first swinging piece is switched from the cutter retracting position to the cutter discharging position, the first swinging piece swings relative to the sewing machine frame and drives the first sliding piece to move, and the first sliding piece drives the trimming cutter to be switched from the cutter retracting state to the cutter discharging state; when the cutter retracting position holding area and the first swinging piece form follow-up matching, the first swinging piece, the first sliding piece and the thread trimming cutter are relatively fixed.

So set up, trimming adjustment mechanism's structure and assembly process are simple, arrange easily, and the biography power process is simple and pass power steady reliable.

In one embodiment, the second driving part comprises a dental framework height adjusting area and a dental framework high-position holding area, wherein the dental framework height adjusting area is smoothly connected with the dental framework high-position holding area and is provided with a dental framework high-position point relatively close to the dental framework high-position holding area and a dental framework low-position point relatively far away from the dental framework high-position holding area; the driving radius of the dental framework height adjusting area is increased from a dental framework low position point to a dental framework high position point, and the driving radius of the dental framework high position maintaining area is consistent with the driving radius of the dental framework high position point; the tooth frame adjusting mechanism is connected with the feed dog, can be in follow-up fit with the tooth frame high-position holding area to keep the feed dog at the upper limit position, and can also be in follow-up fit with the tooth frame height adjusting area to enable the tooth frame adjusting mechanism to act; when the matching position of the dental articulator height adjusting area and the dental articulator adjusting mechanism is switched between a dental articulator high position and a dental articulator low position, the retracting position holding area is matched with the thread trimming adjusting mechanism in a follow-up manner; when the trimming driving area is matched with the trimming adjusting mechanism in a follow-up manner, the dental articulator high-position holding area is matched with the dental articulator adjusting mechanism in a follow-up manner.

So set up, adjusting device has following two functions: the thread cutter can keep the thread cutting position without action while driving the feed dog to move and adjusting the position of the feed dog; when the thread trimming adjusting mechanism drives the thread trimming knife to act, the cloth feeding tooth is positioned at the upper limit position of the cloth feeding tooth and does not act. Therefore, the cloth feeding tooth and the thread trimming knife can be prevented from simultaneously acting to generate motion interference, the cloth feeding and thread trimming efficiency of the sewing machine is ensured, the operation quality of the sewing machine is improved, and the actual production requirement is better met.

In one embodiment, the dental articulator adjusting mechanism comprises a dental articulator adjusting component, an eccentric shaft component and a dental articulator swinging component, the dental articulator adjusting component is matched with the second driving part in a follow-up manner, the eccentric shaft component is connected with the dental articulator adjusting component and is connected with the main shaft, and the dental articulator swinging component is connected with the eccentric shaft component and the dental articulator adjusting component and is connected with the feed dog; when the matching position of the dental articulator height adjusting area and the dental articulator adjusting component is transferred from a dental articulator high position point to a dental articulator low position point, the dental articulator adjusting component drives the dental articulator swinging component to move so as to enable the feed dog to move from an upper limit position to a lower limit position; when the dental articulator high-position holding area is matched with the dental articulator adjusting component in a follow-up manner, the dental articulator adjusting component and the dental articulator swinging component are relatively fixed.

So set up, dental articulator adjustment mechanism can coordinate in order to drive the action of feed dog with the main shaft drive, changes the position of feed dog simultaneously, and it is more showing to adjust the convenience.

In one embodiment, the dental articulator adjusting assembly comprises a second swinging unit, a first rotating unit and a second rotating unit, wherein the second swinging unit is matched with the second driving part in a follow-up manner and is in universal connection with the first rotating unit; the second swing unit can swing along with the rotation of the second driving part and drives the first rotating unit and the second rotating unit to rotate, and the second rotating unit drives the tooth frame swing assembly to swing so as to change the position of the cloth feeding tooth.

So set up, the power transmission efficiency of dental articulator adjusting part is higher, can reduce the power loss among the transmission process to the range of assaulting to dental articulator swing subassembly when can reduce drive member output power is favorable to prolonging dental articulator adjusting mechanism's life.

In one embodiment, the second swing unit includes a second swing member and a second connecting rod, the second swing member and the second driving portion form a follow-up fit through rolling contact, one end of the second connecting rod is hinged to the second swing member, and the other end of the second connecting rod is connected to the first rotating unit.

So set up, the simple structure of second swing unit connects reliably.

In one embodiment, the first rotating unit includes a universal joint, a first torsion member, and a third link, the universal joint having a fixed mounting portion fixedly connected to the first torsion member and a universal joint portion rotatably connected to the second swing unit; one end of the third connecting rod is hinged to the first torsion piece, the other end of the third connecting rod is hinged to the second rotating unit, a first eccentric distance is formed between the rotating center of the third connecting rod on the first torsion piece and the twisting center of the first torsion piece, and a second eccentric distance is formed between the rotating center of the third connecting rod on the second rotating unit and the twisting center of the second rotating unit.

With the arrangement, the first rotating unit can convert the reciprocating motion of the second swinging unit into the fixed shaft rotation, the power transmission direction is changed, the motion impact from the driving component is alleviated, and the smooth and reliable operation of the second rotating unit is ensured.

In one embodiment, the second rotating unit comprises a second torsion piece and a first crank, one end of the second torsion piece is hinged to the first rotating unit, the other end of the second torsion piece is hinged to the first crank, and the first crank is hinged to the eccentric shaft assembly and the dental articulator swinging assembly; the first crank forms a third eccentricity between the rotating center of the second torsion element and the twisting center of the second torsion element, and the first crank forms a fourth eccentricity between the rotating centers of the first crank and the second torsion element relative to the eccentric shaft assembly and the dental articulator swinging assembly.

With this arrangement, the second rotating unit changes the power transmission direction while transmitting power, and realizes the merging of the power of the main shaft and the power of the driving member at the first crank, and causes the merged power to act on the dental articulator swing assembly.

In one embodiment, the eccentric shaft assembly comprises an eccentric shaft and an eccentric connecting rod, the eccentric shaft is connected to the main shaft, one end of the eccentric connecting rod is rotatably connected to the eccentric shaft, and the other end of the eccentric connecting rod is rotatably connected to the dental articulator adjusting assembly and the dental articulator swinging assembly; and a fifth eccentricity is formed between the rotation center of the eccentric connecting rod relative to the eccentric shaft and the rotation center of the main shaft.

By the arrangement, the eccentric shaft assembly and the tooth rack adjusting assembly are simple to assemble, and even if the power of the main shaft is input into the tooth rack adjusting mechanism and the power of the driving component is input into the tooth rack adjusting mechanism, the eccentric shaft assembly and the tooth rack adjusting assembly can be ensured to run in a coordinated mode.

In one embodiment, the gripper frame swing assembly comprises a feed dog crank, a first feed dog connecting rod and a second feed dog connecting rod, the feed dog crank is hinged to the gripper frame adjusting assembly, two ends of the first feed dog connecting rod are respectively hinged to the feed dog crank and the second feed dog connecting rod, and one end, relatively far away from the first feed dog connecting rod, of the second feed dog connecting rod is connected with the feed dog.

So set up, the simple structure of dental articulator swing subassembly, the assembly is arranged conveniently.

The utility model also provides a sewing machine, including above-mentioned arbitrary adjusting device.

The utility model provides an adjusting device, through the first drive division and the second drive division of being connected with the driving source follow-up realized the independent switching adjustment to thread trimmer and feed dog frame, this adjusting device can show the quantity that reduces the drive disk assembly in the sewing machine to simplify drive disk assembly's structure and arrangement, therefore can reduce sewing machine's volume and weight, and then be favorable to reducing sewing machine's production and cost of transportation.

Drawings

Fig. 1 is a schematic perspective view of a sewing machine according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a trimming adjusting mechanism according to an embodiment of the present invention;

fig. 3 is a schematic structural view of a dental articulator adjusting mechanism according to an embodiment of the present invention;

FIG. 4 is a schematic structural view of the dental articulator adjustment mechanism shown in FIG. 3 from another perspective;

fig. 5 is a partial schematic structural view of a driving member according to an embodiment of the present invention;

FIG. 6 is a schematic view of a second cam in the drive member of FIG. 5;

FIG. 7 is a schematic view of a first cam in the drive member of FIG. 5;

FIG. 8 is a schematic view of a follower fit of an embodiment of the present invention;

FIG. 9 is a schematic view of the feed dog adjusting mechanism shown in FIG. 3 adjusting the feed dog to an upper limit position;

FIG. 10 is a schematic view of the dental articulator adjustment mechanism of FIG. 3 adjusting a feed dog to a transition position;

fig. 11 is a schematic view of the feed dog adjusting mechanism shown in fig. 3 adjusting the feed dog to a lower limit position. Description of reference numerals:

100. an adjustment device; 10. a drive member; 101. a drive source; 11. a first driving section; 111. a first cam; 12. a second driving section; 121. a second cam; 20. a trimming adjusting mechanism; 211. a first rolling contact; 212. a first swinging member; 213. a first link; 221. a first slider; 222. a first reset member; 223. a first hinge mount; 30. a dental articulator adjustment mechanism; 3111. a second rolling contact; 3112. a second swinging member; 3113. a second link; 3121. a first torsion member; 3122. a universal connection member; 3123. a third link; 3124. a second reset member; 3125. a spring collar; 3126. a first eccentric hinge; 3131. a second torsion member; 3132. a first crank; 3133. a second hinge mount; 3134. a second eccentric hinge section; 321. an eccentric shaft; 322. an eccentric link; 3311. a feed lifting crank; 3312. a feed lifting shaft; 3313. a first feed lifting connecting rod; 3314. a second feed lifting connecting rod; 3315. a third hinge mount; 3321. a tooth lifting slide block; 3322. a first dental articulator; 3323. a second dental articulator; 3324. a driving tooth; 3325. differential teeth; 3326. a needle plate; 200. a sewing machine; 210. a frame; 220. a thread trimming mechanism; 230. a motor mounting seat; 240. a main shaft.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work all belong to the protection scope of the present invention.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "or/and" includes any and all combinations of one or more of the associated listed items.

A plurality of motion mechanisms, such as a thread cutting mechanism and a cloth feeding mechanism, which realize different functions, are usually integrated into a sewing machine, and the sewing machine completes sewing operations through the cooperative cooperation of the motion mechanisms.

The main function of the thread cutting mechanism is to generate reciprocating motion to drive the thread cutter to repeatedly switch between a cutter-out state and a cutter-in state, so that the thread is continuously hooked and cut off; the main function of the cloth feeding mechanism is to generate reciprocating motion and continuously lift and drag the cloth on the needle plate through the cloth feeding teeth, so that the cloth is continuously conveyed to the machine head.

The existing sewing machine is respectively provided with different adjusting mechanisms for the functional mechanisms, which causes the structure of a driving part and a transmission part in the sewing machine to be complicated and the occupied space to be larger, further causes the volume and the weight of the sewing machine to be increased, causes the transportation cost of the sewing machine to be increased, and causes the production cost of the sewing machine to be increased by the increased driving part.

In view of this, the present invention provides an adjusting device 100 and a sewing machine 200 having the adjusting device 100. The adjusting device 100 is used to adjust the states of the thread trimmer and the feed dog of the sewing machine 200. The adjusting device 100 includes a driving member 10, a thread trimming adjusting mechanism 20, and a dental articulator adjusting mechanism 30. The driving member 10 is connected to a power output end of the same driving source 101, and comprises a first driving part 11 and a second driving part 12 which can rotate along with the movement of the driving source 101; the thread trimming adjusting mechanism 20 is connected with a thread trimming cutter set, and the thread trimming cutter set is provided with a thread trimming cutter; the dental articulator adjustment mechanism 30 is connected to the feed dog.

The trimming adjusting mechanism 20 and the first driving part 11 form follow-up fit through rolling contact, and the first driving part 11 moves under the driving of the driving source 101 and immediately drives the trimming adjusting mechanism 20 to act, so as to drive the trimming knife to act; the tooth rack adjusting mechanism 30 and the second driving part 12 form follow-up fit through rolling contact, the second driving part 12 moves under the driving of the same driving source 101 and drives the tooth rack adjusting mechanism 30 to act immediately, and therefore the movement amplitude and the position of the feed dog relative to the needle plate 3326 are changed.

Please refer to fig. 1 to 5. Fig. 1 is a schematic perspective view of a sewing machine according to an embodiment of the present invention; fig. 2 is a schematic structural diagram of a trimming adjusting mechanism according to an embodiment of the present invention; fig. 3 is a schematic structural view of a dental articulator adjusting mechanism according to an embodiment of the present invention; FIG. 4 is a schematic structural view of the dental articulator adjustment mechanism shown in FIG. 3 from another perspective; fig. 5 is a partial structural schematic view of a driving member according to an embodiment of the present invention.

Specifically, in the present embodiment, the driving member 10 includes a first cam 111 and a second cam 121. The first driving part 11 and the second driving part 12 are respectively a cam curved surface of the first cam 111 and a cam curved surface of the second cam 121; the driving source 101 is a stepping motor fixedly mounted on the motor mounting base 230 and has a power output shaft capable of outputting angular displacement motion, and the motor mounting base 230 is a fixed structure provided on the sewing machine frame 210.

The first cam 111 and the second cam 121 are sequentially arranged along the axial direction of the power output shaft and are relatively fixed. The driving source 101 operates and then rotates the driving member 10 around the axis of the power output shaft at a constant rate, in other words, when the driving source 101 operates, the first cam 111 and the second cam 121 both rotate around the same rotation center at the same instantaneous angular velocity.

The driving member 10 may include a first cam 111 and a second cam 121 that are separately molded and then fixed to each other, or may be an integrally molded structure. When the driving member 10 is an integrally formed structure, the curved surface of the first cam 111 and the curved surface of the second cam 121 are respectively machined, so as to obtain the first driving portion 11 and the second driving portion 12.

It is understood that in other embodiments, the driving source 101 may also adopt other forms of motors, and a speed reduction device may be disposed between the driving source 101 and the driving member 10 to realize speed reduction and torque increase of the output power of the driving source 101.

Please refer to fig. 6 to 8. FIG. 6 is a schematic view of a second cam in the drive member of FIG. 5; FIG. 7 is a schematic view of a first cam in the drive member of FIG. 5; fig. 8 is a schematic view of a follow-up fit according to an embodiment of the present invention.

The first driving portion 11 shown in fig. 7 includes a trimming driving region β 'and a cutting position holding region α'. The trimming driving area β 'is smoothly connected to the cutting position holding area α', which is an arc surface coaxial with the rotation center of the first driving portion 11. The trimming driving region β ' has a cutting retracting position L ' relatively close to the cutting retracting position holding region α ' and a cutting discharging position H ' relatively far from the cutting retracting position holding region α '.

The driving radius R1 'of the tool retracting position holding area alpha' is consistent with the driving radius of the tool retracting position L ', and the numerical values are the radius of the arc surface where the tool retracting position holding area alpha' is located; the driving radius R2 'of the cutting drive region β' gradually increases from the cutting point L 'toward the cutting point H'. It should be noted that the driving radius of the retracting point L 'and the driving radius of the cutting point H' are distances from the retracting point L 'or the cutting point H' to the rotation center of the first driving part 11.

The second driving part 12 shown in fig. 6 includes a dental framework height adjusting region α and a dental framework high-position holding region β. The dental articulator height adjusting region alpha is smoothly connected with the dental articulator high-position holding region beta, wherein the dental articulator high-position holding region beta is an arc surface coaxial with the rotation center of the second driving part. The dental framework height adjusting region α has a dental framework high site H relatively close to the dental framework high retention region β and a dental framework low site L relatively far from the dental framework high retention region β.

The driving radius R2 of the dental framework high-level holding area beta is consistent with the driving radius of the dental framework high-level point H, and the numerical values are the radius of the arc surface where the dental framework high-level holding area beta is located; the driving radius R1 of the dental framework height adjusting region α gradually increases from the dental framework low position L to the dental framework high position H. It should be noted that the driving radius of the dental framework low position L and the driving radius of the dental framework high position H are distances from the dental framework low position L or the dental framework high position H to the rotation center of the second driving portion 12.

The tooth frame adjusting mechanism 30 is connected with a tooth frame mechanism which is provided with a feed dog. When the dental articulator adjusting mechanism 30 is in follow-up fit with the dental articulator high-position holding area beta, the dental articulator adjusting mechanism 30 can constrain the dental articulator mechanism to keep the feed dog at the upper limit position, and at this time, the feed dog jacks up the cloth and reaches the maximum jack-up height; when the dental articulator adjusting mechanism 30 is in follow-up fit with the dental articulator height adjusting area alpha and the contact position between the two changes with the rotation of the second cam 121, the dental articulator adjusting mechanism 30 moves and drives the feed dog to move and switch between the upper limit position and the lower limit position.

Please refer to fig. 9-11. FIG. 9 is a schematic view of the feed dog adjusting mechanism shown in FIG. 3 adjusting the feed dog to an upper limit position; FIG. 10 is a schematic view of the dental articulator adjustment mechanism of FIG. 3 adjusting a feed dog to a transition position;

fig. 11 is a schematic view of the feed dog adjusting mechanism shown in fig. 3 adjusting the feed dog to a lower limit position.

Specifically, when the rack adjusting mechanism 30 is in contact with the rack height adjusting area α at the rack high point H, the feed dog is at the upper limit position where the feed dog protrudes out of the needle plate 3326, as shown in fig. 9; when the contact position of the dental articulator adjusting mechanism 30 and the dental articulator height adjusting area alpha is between the dental articulator high position H and the dental articulator low position L, the feed dog is in a transition position between the upper limit position and the lower limit position, as shown in fig. 10, at which time the height of the feed dog for jacking up the cloth is reduced compared to that at the upper limit position; when the tooth holder adjusting mechanism 30 contacts with the tooth holder height adjusting area α at the tooth holder low position L, the feed dog is at the lower limit position, and the height of the feed dog in the vertical direction is lower than the height of the needle plate 3326, and the feed dog releases the cloth so that the feed mechanism (not shown) can drag the cloth and can put the cloth in, as shown in fig. 11.

The thread trimming adjusting mechanism 20 is connected with the thread trimming mechanism 220, and the thread trimming mechanism 220 is provided with a thread trimming knife. When the cutting position holding area alpha' is matched with the trimming adjusting mechanism 20 in a follow-up manner, the trimming adjusting mechanism 20 and the trimming mechanism 220 do not act, and the trimming cutter keeps a cutting state under the constraint of the trimming adjusting mechanism 20; when the trimming driving region β 'is in follow-up fit with the trimming adjusting mechanism 20 and the contact position of the trimming driving region β' and the trimming adjusting mechanism is shifted from the cutting retracting position L 'to the cutting discharging position H', the trimming adjusting mechanism 20 drives the trimming knife to move forward, and the cutting retracting state is switched to the cutting discharging state.

After the matching position of the trimming adjusting mechanism 20 and the first driving portion 11 reaches the cutting-out position H ' from the cutting-out position L ' through the trimming driving region β ', the driving source 101 continues to operate and continues to drive the first cam 111 to rotate, so that the matching position of the first driving portion 11 and the trimming adjusting mechanism 20 is again shifted from the cutting-out position H ' to the cutting-out position holding region α ' along the counterclockwise direction of the first cam 111 shown in fig. 6, at this time, the trimming adjusting mechanism 20 drives the trimming knife to move in the reverse direction, and the trimming knife is switched from the cutting-out state to the cutting-in state.

To this end, the thread trimming adjustment mechanism 20 drives the thread trimming blade to perform an operation of [ extending-retracting ] in which the thread trimming blade cuts and hooks the thread, respectively. The driving source 101 continuously operates and drives the first driving portion 11 to continuously rotate, so that the action process can be repeated, the thread trimmer reciprocates and repeatedly performs the action process, and the thread trimming adjusting mechanism 20 repeatedly switches the thread trimmer between the thread feeding state and the thread retracting state, so that the sewing operation is continuously performed.

The action process and principle of thread trimming mechanism 220 and thread trimming sword are not the utility model discloses the scheme that will protect adopts the well-known thread trimming mechanism 220 of tradition can realize above-mentioned action process, consequently no longer details to the connection and the action process of thread trimming mechanism 220 and thread trimming sword.

The following are the specific structure and connection relationship of the trimming adjusting mechanism 20 of the present invention. Specifically, the trimming adjustment mechanism 20 includes a first swing member 212 and a first sliding member 221, and the first swing member 212 is disposed in a moving space of the motor mount 230, which is formed by a cavity opened on a side of the motor mount 230 facing the motor. The first swinging member 212 is in rolling contact with the inner wall surface of the motor mount 230, and forms a follow-up fit with the first driving portion 11 through rolling contact; the first sliding part 221 is movably connected with the first swinging part 212, is in sliding fit with the sewing machine frame 210, and can move relative to the frame 210 along the axial direction under the driving of the first swinging part 212; the thread trimming mechanism 220 is movably connected to an end of the first slider 221.

When the contact position between the first driving portion 11 and the first swinging member 212 is shifted from the cutting position to the cutting position holding region or the cutting position holding region through the trimming driving region, the first swinging member 212 swings relative to the frame 210 and drives the first sliding member 221 to move, and the first sliding member 221 drives the trimming blade to switch from the cutting state to the cutting state through the trimming mechanism 220.

Further, the trimming adjusting mechanism 20 further includes a first returning member 222, and the first returning member 222 can elastically act on the first swinging member 212 or the first sliding member 221 so as to keep the first swinging member 212 in rolling contact with the first driving portion 11, thereby keeping the follow-up fit.

Specifically, in the present embodiment, the first restoring member 222 is an extension spring sleeved on the first sliding member 221, one end of the first restoring member 222 abuts against the first hinge seat 223, and the other end abuts against the sewing machine frame 210, and is in an elastic compression state, and has an elastic deformation tendency that the first swinging member 212 keeps contact with the knife retracting position holding area of the first driving portion 11, that is, the first restoring member 222 has a tendency that the thread trimmer keeps in a knife retracting state.

Optionally, a first hinge seat 223 and a first connecting rod 213 are further disposed between the first swinging member 212 and the first sliding member 221, the first hinge seat 223 is fixedly sleeved on the outer peripheral wall of the first sliding member 221, and two ends of the first connecting rod 213 are respectively hinged to the first swinging member 212 and the first hinge seat 223; the first oscillating member 212 is also fixedly attached with a first rolling contact element 211, and the first rolling contact element 211 is preferably a bearing whose outer circumferential wall is in rolling contact with the first drive part 11.

Please refer to fig. 6-8 again. When the matching position of the dental articulator height adjusting area alpha and the dental articulator adjusting mechanism 30 is switched between the dental articulator high site H and the dental articulator low site L, the closing position holding area alpha' is matched with the trimming adjusting mechanism 20 in a follow-up manner; when the trimming driving region β' is in follow-up engagement with the trimming adjustment mechanism 20, the dental articulator high-position holding region β is in follow-up engagement with the dental articulator adjustment mechanism 30.

So configured, the adjustment device 100 has the following two functions: the thread cutting knife can keep a knife retracting state and does not act at a receiving position while the thread cutting knife drives the feed dog to move and adjusts the position of the feed dog relative to the needle plate 3326; during the action of the thread trimming adjusting mechanism 20 driving the thread trimming knife, the feed dog can be kept at the upper limit position without action. Therefore, the adjusting device 100 can prevent the feed dog and the thread trimming knife from acting simultaneously, avoid the motion interference between the feed dog and the thread trimming knife, ensure the feed and thread trimming efficiency of the sewing machine 200, improve the operation quality of the sewing machine 200 and better meet the actual production requirement.

As shown in fig. 8, at this time, the dental articulator height adjustment area α contacts with the dental articulator adjustment mechanism 30, the trimming drive area α' contacts with the trimming adjustment mechanism 20, the drive source 101 drives the second cam 121 to rotate, and the second cam 121 drives the dental articulator adjustment assembly to perform feed dog height adjustment. The second cam 121 rotates in a clockwise direction of the second cam 121 shown in fig. 8 to raise the feed dog, and rotates in a counterclockwise direction to lower the feed dog. When the second cam 121 continues to rotate to enable the dental articulator adjusting mechanism 30 to be matched with the dental articulator high-position holding area β, the driving member 10 continues to rotate clockwise in fig. 8, so that the trimming driving area β 'starts to contact with the trimming adjusting mechanism 20, and as the driving source 101 rotates, the trimming driving area β' drives the trimming adjusting mechanism 20 to drive the trimming knife to extend out, and after the driving source 101 is driven to a preset position, the driving source 101 reversely rotates and drives the trimming knife to retract, so that the trimming and hooking actions are completed.

It should be noted that the schematic structural diagrams of the first cam and the second cam shown in fig. 6-7 and the follow-up cooperation of the driving member 10 with the trimming adjusting mechanism 20 and the rack adjusting mechanism 30 shown in fig. 8 are only the combination of the preferred embodiments of the present invention. In other embodiments, the driving member, the trimming adjusting mechanism and the dental articulator adjusting mechanism can have more different follow-up matching arrangements, and are not limited to the above-mentioned arrangements. In other words, the above arrangement should not be understood as the only possible embodiment of the drive member 10 in a follow-up fit with the thread trimming adjustment mechanism 20 and the dental articulator adjustment mechanism 30.

The following is a specific structure and connection relationship of the dental articulator adjustment mechanism 30 in the present embodiment. The dental articulator adjusting mechanism 30 comprises a dental articulator adjusting assembly, an eccentric shaft assembly and a dental articulator swinging assembly. The dental articulator adjusting component is matched with the second driving part 12 in a follow-up manner; the eccentric shaft assembly is connected with the thread frame adjusting assembly and is connected with a main shaft 240 of the sewing machine 200; the tooth frame swinging assembly is connected with the eccentric shaft assembly and the tooth frame adjusting assembly and is connected with the feed dog through the tooth frame mechanism.

Part of power generated by the driving source 101 is transmitted to the dental articulator swinging assembly through the dental articulator adjusting assembly; meanwhile, part of the power generated by the main shaft 240 is transmitted to the dental articulator swing assembly through the eccentric shaft 321, and the part of the power generated by the main shaft 240 is used for driving the feed dog to continuously reciprocate and is combined with the power of the driving source 101 to jointly act on the dental articulator swing assembly so as to ensure that the position adjustment and the reciprocating motion of the feed dog are mutually coordinated.

The dental articulator adjusting assembly comprises a second swinging unit, a first rotating unit and a second rotating unit, the second swinging unit is in follow-up fit with the second driving portion 12 and is in universal connection with the first rotating unit, the first rotating unit is in rotating connection with the second rotating unit, the second rotating unit is connected with the eccentric shaft assembly and the dental articulator swinging assembly, and the power of the driving source 101 and the power of the main shaft 240 are converged at the second rotating unit and jointly act on the dental articulator swinging assembly.

The second swing unit can swing along with the rotation of the second driving part 12 and drives the first rotating unit and the second rotating unit to rotate, and the second rotating unit drives the tooth frame swing assembly to swing so as to change the position of the feed dog.

Specifically, the second swing unit includes a second swing member 3112 and a second connecting rod 3113, the second swing member 3112 and the second driving portion 12 form a follow-up fit through rolling contact, one end of the second connecting rod 3113 is hinged to the second swing member 3112, and the other end is connected to the first swing unit through a universal connection.

Preferably, in the present embodiment, the second swing unit further includes a second rolling contact 3111, and the second rolling contact 3111 is fixedly disposed with respect to the second swing member 3112 and is in follow-up engagement with the second driving portion 12. The second rolling elements are preferably bearings, which are in rolling contact with the second drive 12 via their outer circumferential wall.

The first rotating unit includes a universal joint 3122, a first torsion member 3121, and a third link 3123, the universal joint 3122 has a fixed mounting portion fixedly connected to the first torsion member 3121, and a universal joint portion rotatably connected to the second link 3113, and the universal joint portion preferably adopts a ball joint. The first torsion member 3121 is a rod member, and one end thereof relatively far from the second link 3113 is fixedly provided with a first eccentric hinge portion 3126 protruding outward in a radial direction, and one end of the third link 3123 is hinged to the first eccentric hinge portion 3126 and the other end is hinged to the second rotating unit.

The rotation center of the third link 3123 on the first torque member 3121, that is, the rotation axis between the third link 3123 and the first eccentric hinge 3126 forms a first eccentric distance with the rotation center of the first torque member 3121, and the rotation center of the first torque member 3121 is the axis of the first torque member 3121; the third link 3123 forms a second eccentricity between a rotation center on the second rotation unit and a torsion center of the second rotation unit.

Preferably, in this embodiment, the first rotating unit further includes a second returning member 3124 and a spring retaining ring 3125, the spring retaining ring 3125 is fixedly sleeved on the first torsion member 3121, the spring retaining ring 3125 is preferably a torsion spring, and two ends of the torsion spring are respectively connected to the sewing machine frame 210 and the spring retaining ring 3125. The second restoring member 3124 is capable of generating an elastic restoring force to the first torsion member 3121, which has a tendency to bring the second swinging member 3112 into contact engagement with the rack low position holding area on the second driving portion 12, that is, the second restoring member 3124 has a tendency to bring the feed dog to move to the lower limit position and hold the feed dog at the lower limit position.

The second rotating unit includes a second torsion element 3131 and a first crank 3132, the second torsion element 3131 is a rod, a second eccentric hinge 3134 protruding outward in a radial direction is fixed on one end of the second torsion element 3131 opposite to the end far away from the first crank 3132, the third connecting rod 3123 is hinged to the second eccentric hinge 3134, a second eccentric distance is formed between a rotation axis between the third connecting rod 3123 and the second eccentric hinge 3134 and a torsion center of the second torsion element 3131, and the torsion center of the second torsion element 3131 is a torsion center of the second rotating unit, specifically, an axis of the second torsion element 3131.

The first crank 3132 is hinged to the second torsion element 3131, and is hinged to the eccentric shaft assembly and the rack swing assembly. The first crank 3132 forms a third eccentricity between the rotation center of the second torsion element 3131 and the torsion center of the second torsion element 3131, and the first crank 3132 forms a fourth eccentricity between the rotation center of the second torsion element 3131 and the rotation center of the first crank 3132 with respect to the eccentric shaft assembly and the dental articulator oscillating assembly. The power transmitted from the driving source 101 to the rack adjusting mechanism 30 and the power transmitted from the main shaft 240 through the eccentric shaft 321 meet at the first crank 3132 and act on the rack swing assembly.

Preferably, in this embodiment, the second rotating unit further includes a second hinge base 3133, and the second hinge base 3133 is fixedly sleeved on the second torsion element 3131 and is hinged to the first crank 3132.

The eccentric shaft assembly comprises an eccentric shaft 321 and an eccentric connecting rod 322, the eccentric shaft 321 is sleeved on the peripheral wall of the main shaft 240, one end of the eccentric connecting rod 322 is sleeved and rotatably connected to the eccentric shaft 321, and the other end of the eccentric connecting rod is rotatably connected to the dental articulator swinging assembly and the dental articulator adjusting assembly. Specifically, the eccentric link 322 forms a fifth eccentricity between the rotation center of the eccentric shaft 321 and the rotation center of the main shaft 240.

In the present embodiment, the eccentric shaft 321 is formed separately from the main shaft 240. It is understood that in other embodiments, the eccentric shaft 321 may also be an eccentric shaft 321 segment disposed on the main shaft 240, that is, the eccentric shaft 321 segment may also be a structure integrally formed with the main shaft 240, and the fifth eccentricity mentioned above is formed between the rotation center of the eccentric link 322 relative to the eccentric shaft 321 segment and the rotation center of the main shaft 240.

The swing component of the dental articulator comprises a feed lifting crank 3311, a first feed lifting connecting rod 3313 and a second feed lifting connecting rod 3314, wherein the feed lifting crank 3311 is hinged to a first crank 3132, and the rotation axis of the feed lifting crank 3311 relative to the first crank 3132 is collinear with the rotation axis of the eccentric connecting rod 322 relative to the feed lifting crank 3311 and the first crank 3132, i.e. the first crank 3132, the eccentric connecting rod 322 and the feed lifting crank 3311 are hinged to each other. Two ends of the first feed lifting connecting rod 3313 are respectively hinged with the feed lifting crank 3311 and the second feed lifting connecting rod 3314, and one end of the second feed lifting connecting rod 3314, which is relatively far away from the first feed lifting connecting rod 3313, is hinged with the feed lifting shaft 3312, so that the feed lifting shaft 3312 is connected with the feed lifting teeth.

Preferably, in this embodiment, a third hinge seat 3315 is fixedly secured to the outer peripheral wall of the feed lifting shaft 3312, and the second feed lifting link 3314 is hinged to the third hinge seat 3315.

The power of the driving source 101 and the power of the main shaft 240 jointly act on the dental articulator adjustment mechanism 30. The main shaft 240 drives the tooth rack swinging assembly to swing through the eccentric shaft assembly, and the tooth rack swinging assembly enables the cloth feeding teeth to move in the vertical direction through the tooth rack mechanism; the driving source 101 moves the feed dog adjusting assembly such that the positions of the hinge points of the first crank 3132, the eccentric link 322, and the feed dog crank 3311 with respect to the frame 210 are changed, thereby changing the swing amplitude of the feed dog swing assembly and changing the position of the feed dog in the vertical direction with respect to the needle plate 3326.

Furthermore, the tooth holder mechanism comprises a tooth lifting shaft 3312, a tooth lifting slider 3321, a third hinge base 3315, a first tooth holder 3322 and a second tooth holder 3323, wherein the first tooth holder 3322 and the second tooth holder 3323 are respectively provided with a driving tooth 3324 and a differential tooth 3325 which penetrate through and extend out of a needle plate 3326, and the driving tooth 3324 and the differential tooth 3325 form a feed tooth together; the tooth lifting shaft 3312 is fixedly arranged on the third hinge base 3315 in a penetrating way and is rotatably connected with the tooth rack adjusting mechanism 30 through the third hinge base 3315; the tooth lifting sliding block 3321 is rotatably connected with the end part of the tooth lifting shaft 3312; the first tooth frame 3322 and the second tooth frame 3323 are respectively provided with a first slide way and a second slide way, and the tooth lifting slide block 3321 is arranged in the first slide way and the second slide way in a sliding manner.

The feed dog shaft 3312 can swing under the driving of the rack adjusting mechanism 30 and the main shaft 240, and the first rack 3322 and the second rack 3323 guide the feed dog slider 3321 to move in the horizontal direction in the first slide way and the second slide way, so that the horizontal displacement component in the swing of the feed dog shaft 3312 is released, and the vertical displacement component is retained and the feed dog is driven to move in the vertical direction. The vertical movement path of the feed dog has an upper limit position for jacking up the cloth and a lower limit position for releasing the cloth, and when the feed dog moves from the lower limit position to the upper limit position, the feed dog extends out of the needle plate 3326, whereas the feed dog moves in a sinking manner in a direction away from the needle plate 3326.

The utility model provides an adjusting device, through the first drive division and the second drive division of being connected with the driving source follow-up realized the independent switching adjustment to thread trimmer and feed dog frame, this adjusting device can show the quantity that reduces the drive disk assembly in the sewing machine to simplify drive disk assembly's structure and arrangement, therefore can reduce sewing machine's volume and weight, and then be favorable to reducing sewing machine's production and cost of transportation.

The features of the above-described embodiments may be arbitrarily combined, and for the sake of brevity, all possible combinations of the features in the above-described embodiments are not described, but should be construed as being within the scope of the present disclosure as long as there is no contradiction between the combinations of the features.

It will be appreciated by those skilled in the art that the above embodiments are only for illustrating the present invention and are not to be taken as limiting the present invention, and that suitable modifications and variations of the above embodiments are within the scope of the invention as claimed.

Claims (13)

1. An adjusting device for adjusting the state of a thread trimming knife and a feed dog in a sewing machine, characterized in that the adjusting device comprises a driving member (10), a thread trimming adjusting mechanism (20) and a thread rack adjusting mechanism (30);

the driving member (10) is connected to a power output end of the driving source (101) and comprises a first driving part (11) and a second driving part (12) which can rotate along with the movement of the driving source (101);

the first driving part (11) and the trimming adjusting mechanism (20) form follow-up fit and are used for driving the trimming adjusting mechanism (20) to act so as to drive the trimming knife to act; and a process for the preparation of a coating,

the second driving part (12) and the tooth frame adjusting mechanism (30) form follow-up fit and are used for driving the tooth frame adjusting mechanism (30) to act so as to change the position of the cloth feeding teeth.

2. The adjusting device according to claim 1, wherein the driving member (10) comprises a first cam (111) and a second cam (121) which are fixed relatively, and the first driving portion (11) and the second driving portion (12) are respectively and correspondingly arranged on the first cam (111) and the second cam (121);

the first cam (111) and the second cam (121) are connected to a power output end of the driving source (101) and can synchronously rotate under the driving of the driving source (101).

3. The adjusting device according to claim 1, characterized in that the first driving part (11) comprises a cutting line driving area and a cutting position holding area, the cutting line driving area is smoothly connected with the cutting position holding area and is provided with a cutting position point relatively close to the cutting position holding area and a cutting position point relatively far away from the cutting position holding area; the driving radius of the trimming line driving area is increased from the cutting retracting point to the cutting discharging point, and the driving radius of the cutting retracting position maintaining area is consistent with the driving radius of the cutting retracting point;

the trimming adjusting mechanism (20) is connected with the trimming knife, and when the matching position of the trimming driving area and the trimming adjusting mechanism (20) is transferred from the knife retracting position to the knife discharging position, the trimming adjusting mechanism (20) moves and drives the trimming knife to switch from the knife retracting state to the knife discharging state;

when the cutter retracting position holding area and the trimming adjusting mechanism (20) form follow-up matching, the trimming adjusting mechanism (20) enables the trimming cutter to keep a cutter retracting state.

4. The adjusting device according to claim 3, characterized in that the trimming adjusting mechanism (20) comprises a first oscillating member (212) and a first sliding member (221), the first oscillating member (212) forms a follow-up fit with the first driving part (11) through rolling contact and is movably connected with the first sliding member (221), and the first sliding member (221) is slidably fitted with the sewing machine frame (210) and is connected with the trimming knife;

when the matching position of the trimming driving area and the first swinging piece (212) is switched from the cutting retracting position to the cutting discharging position, the first swinging piece (212) swings relative to the sewing machine frame (210) and drives the first sliding piece (221) to move, and the first sliding piece (221) drives the trimming knife to be switched from the cutting retracting state to the cutting discharging state;

when the tool retracting position holding area and the first swinging piece (212) form follow-up fit, the first swinging piece (212), the first sliding piece (221) and the thread trimmer are relatively fixed.

5. The adjustment device according to claim 3, characterized in that the second drive part (12) comprises a dental framework height adjustment zone and a dental framework high retention zone, the dental framework height adjustment zone being smoothly connected to the dental framework high retention zone and having a dental framework high point relatively close to the dental framework high retention zone and a dental framework low point relatively far from the dental framework high retention zone; the driving radius of the dental framework height adjusting area is increased from the dental framework low position point to the dental framework high position point, and the driving radius of the dental framework high position maintaining area is consistent with the driving radius of the dental framework high position point;

the tooth frame adjusting mechanism (30) is connected with a feed dog, can be in follow-up fit with the tooth frame high-position holding area to enable the feed dog to be held at an upper limit position, and can also be in follow-up fit with the tooth frame height adjusting area to enable the tooth frame adjusting mechanism to act;

when the matching position of the dental articulator height adjusting area and the dental articulator adjusting mechanism (30) is switched between the dental articulator high position and the dental articulator low position, the cutter retracting position maintaining area is matched with the thread trimming adjusting mechanism (20) in a follow-up manner;

when the trimming driving area is matched with the trimming adjusting mechanism (20) in a follow-up manner, the dental articulator high-position holding area is matched with the dental articulator adjusting mechanism (30) in a follow-up manner.

6. The adjusting device according to claim 5, characterized in that the dental articulator adjusting mechanism (30) comprises an articulator adjusting assembly, an eccentric shaft assembly, and an articulator swinging assembly, the articulator adjusting assembly being in follow-up fit with the second drive part (12), the eccentric shaft assembly being connected to the articulator adjusting assembly and to the main shaft (240), the articulator swinging assembly being connected to the eccentric shaft assembly and the articulator adjusting assembly and to the feed dog;

when the matching position of the dental frame height adjusting area and the dental frame adjusting assembly is transferred from the dental frame high position to the dental frame low position, the dental frame adjusting assembly drives the dental frame swinging assembly to move, so that the feed dog moves from an upper limit position to a lower limit position;

when the dental articulator high-position holding area is matched with the dental articulator adjusting component in a follow-up mode, the dental articulator adjusting component and the dental articulator swinging component are relatively fixed.

7. The adjusting device according to claim 6, characterized in that the dental articulator adjusting assembly comprises a second oscillating unit, a first rotating unit and a second rotating unit, the second oscillating unit being in follow-up engagement with the second drive part (12) and being universally connected with the first rotating unit, the first rotating unit being in rotational connection with the second rotating unit, the second rotating unit connecting the eccentric shaft assembly and the dental articulator oscillating assembly;

the second swing unit can swing along with the rotation of the second driving part (12) and drives the first rotating unit and the second rotating unit to rotate, and the second rotating unit drives the tooth frame swing assembly to swing so as to change the position of the cloth feeding teeth.

8. The adjusting apparatus according to claim 7, characterized in that the second swing unit comprises a second swing member (3112) and a second link (3113), the second swing member (3112) and the second driving portion (12) forming a follower engagement by rolling contact, one end of the second link (3113) being hinged to the second swing member (3112) and the other end being connected to the first swing unit.

9. The adjusting apparatus according to claim 7, characterized in that the first rotary unit comprises a universal joint (3122), a first torsion member (3121) and a third link (3123), the universal joint (3122) having a fixed mounting fixedly connected to the first torsion member (3121) and a universal connection rotatably connected to the second swing unit;

the third link (3123) is hinged at one end to the first rotation member (3121) and at the other end to the second rotation unit, the third link (3123) forms a first eccentricity between a rotation center on the first rotation member (3121) and a torsion center of the first rotation member (3121), and the third link (3123) forms a second eccentricity between a rotation center on the second rotation unit and a torsion center of the second rotation unit.

10. The adjusting device according to claim 7, wherein the second rotating unit comprises a second torsion element (3131) and a first crank (3132), one end of the second torsion element (3131) being hinged to the first rotating unit and the other end being hinged to the first crank (3132), the first crank (3132) being hinged to the eccentric shaft assembly and the dental articulator oscillating assembly;

the first crank (3132) forms a third eccentricity between a rotation center on the second torsion element (3131) and a torsion center of the second torsion element (3131), and the first crank (3132) forms a fourth eccentricity between a rotation center of the second torsion element (3131) and a rotation center of the first crank (3132) with respect to the eccentric shaft assembly and the dental articulator oscillating assembly.

11. The adjustment device according to claim 6, characterized in that the eccentric shaft assembly comprises an eccentric shaft (321) and an eccentric connecting rod (322), the eccentric shaft (321) is connected to the main shaft (240), one end of the eccentric connecting rod (322) is rotatably connected to the eccentric shaft (321), and the other end is rotatably connected to the dental articulator adjustment assembly and the dental articulator swinging assembly;

the eccentric connecting rod (322) forms a fifth eccentricity between the rotation center of the eccentric shaft (321) and the rotation center of the main shaft (240).

12. The adjusting device according to claim 6, wherein the dental articulator swing assembly comprises a feed dog crank (3311), a first feed dog link (3313) and a second feed dog link (3314), the feed dog crank (3311) being hinged to the dental articulator adjusting assembly, the feed dog crank (3311) and the second feed dog link (3314) being hinged to the first feed dog link (3311) and the second feed dog link (3314) at opposite ends of the first feed dog link (3313), respectively, and the feed dog being connected to the second feed dog link (3314) at an end thereof opposite to the end thereof remote from the first feed dog link (3313).

13. A sewing machine, characterized in that it comprises an adjustment device according to any one of claims 1-12.

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