CN214572633U - Joint adjustment mechanism and sewing machine - Google Patents

Abstract

The utility model relates to a joint adjusting mechanism and sewing machine. The joint adjusting mechanism is connected with a driving source of the sewing machine and used for controlling the operation of a thread cutting mechanism and a presser foot lifting mechanism of the sewing machine, the joint adjusting mechanism comprises a driving cam, a thread cutting driving connecting rod and a presser foot driving assembly, and the driving cam comprises a thread cutting area and a presser foot lifting area; the driving cam is connected to the output end of the driving source and can rotate along with the driving source; the trimming driving connecting rod comprises a connecting rod part and a sliding part which are fixed with each other, the connecting rod part and the trimming area of the driving cam are in follow-up fit, and the connecting rod part drives the sliding part to swing; the sliding part is in sliding fit with a cutter shaft crank of the thread trimming mechanism and drives the thread trimming mechanism to operate through the cutter shaft crank; the presser foot driving component and the presser foot lifting area form follow-up matching and control the presser foot lifting mechanism to switch the presser foot lifting state.

Description

Joint adjustment mechanism and sewing machine

Technical Field

The utility model relates to a sewing machine technical field especially relates to a joint adjusting mechanism and sewing machine.

Background

In the existing sewing machine, the adjusting mechanism capable of adjusting the thread cutting mechanism and the presser foot lifting mechanism simultaneously has a complex structure, and the internal electromagnet structure has higher noise when cutting threads or lifting the presser foot, and is easy to abrade other components in the sewing machine.

SUMMERY OF THE UTILITY MODEL

In view of the above, there is a need to provide an improved joint adjusting mechanism and a sewing machine. This allies oneself with transfers mechanism can correspondingly avoid the drawback that brings because the electro-magnet drive, makes the corresponding reduction of wearing and tearing of other parts in the sewing machine simultaneously to prolong sewing machine's life.

The joint adjusting mechanism is connected with a driving source of the sewing machine and used for controlling the operation of a thread cutting mechanism and a presser foot lifting mechanism of the sewing machine, the joint adjusting mechanism comprises a driving cam, a thread cutting driving connecting rod and a presser foot driving assembly, and the driving cam comprises a thread cutting area and a presser foot lifting area; the driving cam is connected to the output end of the driving source and can rotate along with the driving source;

the trimming driving connecting rod comprises a connecting rod part and a sliding part which are fixed with each other, the connecting rod part and the trimming area of the driving cam are in follow-up fit, and the connecting rod part drives the sliding part to swing; the sliding part is in sliding fit with a cutter shaft crank of the thread trimming mechanism and drives the thread trimming mechanism to operate through the cutter shaft crank;

the presser foot driving component and the presser foot lifting area form follow-up matching and control the presser foot lifting mechanism to switch the presser foot lifting state.

Furthermore, the joint adjusting mechanism further comprises a connecting pin inserted in the cutter shaft crank, the sliding part is provided with a sliding groove, the sliding groove is used for the connecting pin to stretch into and be connected with the sliding part in a sliding manner, and the wire cutting driving connecting rod stirs the cutter shaft crank to rotate through the sliding fit of the connecting pin and the sliding groove.

Furthermore, the joint adjustment mechanism further comprises a trimming roller, the trimming roller is rotatably arranged at a position where the trimming driving connecting rod is contacted with the driving cam, and the trimming driving connecting rod is contacted with the driving cam through the trimming roller.

Further, the presser foot drive assembly includes:

the presser foot driving crank is matched with the presser foot lifting area in a follow-up manner and can rotate around the fixed shaft under the driving of the driving cam;

the presser foot swing rod is connected to a presser foot shaft in the presser foot lifting mechanism and is in circumferential linkage with the presser foot shaft;

and two ends of the pull rod are respectively connected to the presser foot driving crank and the presser foot oscillating bar and can drive the presser foot oscillating bar to rotate along with the rotation of the presser foot driving crank so as to drive the presser foot lifting mechanism to switch the presser foot lifting state.

Further, the joint adjusting mechanism further comprises a presser foot roller, the presser foot roller is arranged at the position where the presser foot driving crank is contacted with the driving cam in a rolling mode, and the presser foot driving assembly is contacted with the driving cam through the presser foot roller.

Further, the presser foot driving assembly further comprises a presser foot crank arranged between the presser foot oscillating bar and the presser foot shaft, the presser foot crank is fixedly sleeved on the presser foot shaft, and the presser foot crank is abutted to the presser foot oscillating bar along a first direction.

Furthermore, the presser foot swing rod extends along the radial direction and forms a first connecting convex part, the presser foot swing rod correspondingly forms a second connecting convex part, and the first connecting convex part is abutted against the second connecting convex part.

Furthermore, the presser foot driving assembly further comprises a presser foot elastic member, the thread trimming driving connecting rod and the presser foot driving crank are respectively located on two opposite sides of the driving cam, the thread trimming driving connecting rod abuts against the thread trimming area through the thread trimming elastic member, and the presser foot driving crank abuts against the presser foot lifting area of the driving cam through the presser foot elastic member.

Furthermore, the driving cam further comprises an idle area arranged in the thread trimming area and the presser foot lifting area, and when the thread trimming area of the driving cam corresponds to the thread trimming driving connecting rod, the idle area corresponds to the presser foot driving component; when the presser foot lifting area of the driving cam corresponds to the presser foot driving component, the idle area corresponds to the thread cutting driving connecting rod.

The utility model discloses an embodiment still provides a sewing machine, sewing machine include thread trimming mechanism, lift presser foot mechanism and as above-mentioned arbitrary one allies oneself with accent mechanism.

Drawings

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

FIG. 2 is a disassembled view of the sewing machine of FIG. 1 with some components omitted;

FIG. 3 is a disassembled schematic view of a joint debugging mechanism in the sewing machine shown in FIG. 1;

fig. 4 is a schematic structural view of a driving cam in the joint adjusting mechanism shown in fig. 3.

Description of the element reference numerals

100. A sewing machine; 101. a needle plate; 102. a fixed seat; 10. a thread trimming mechanism; 11. a cutter shaft crank; 111. connecting grooves; 112. a connecting pin; 12. a thread trimming cutter set; 121. a drive shaft; 13. a tool holder assembly; 131. a tool holder; 20. a presser foot lifting mechanism; 21. a presser foot shaft; 22. a presser foot arm; 23. a foot pressing plate; 24. a presser foot shaft sleeve; 30. a drive source; 40. a joint adjusting mechanism; 41. a drive cam; alpha, a trimming area; beta, lifting a presser foot area; gamma, empty row region; 411. rotating points; 42. a trimming drive link; 421. a link section; 422. a sliding part; 4221. a chute; 423. trimming rollers; 424. a thread trimming elastic member; 43. a presser foot drive assembly; 431. a presser foot elastic member; 432. the presser foot drives the crank; 4321. a presser foot roller; 433. a presser foot swing rod; 434. a pull rod; 435. a presser foot crank.

The present invention is described in further detail with reference to the drawings and the detailed description.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail with reference to the accompanying drawings and the following detailed description. It should be understood that the detailed description and specific examples, while indicating the scope of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention.

It will be understood that when an element is referred to as being "mounted on" another element, it can be directly on the other element or intervening elements may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present. When an element is referred to as being "secured to" another element, it can be directly secured to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.

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.

An embodiment of the present invention provides a sewing machine 100, and the sewing machine 100 is used for sewing cloth. The sewing machine 100 may be a flat-seam machine, or a overedger.

Referring to fig. 1 and 2 together, fig. 1 is a schematic structural diagram of a sewing machine 100 according to an embodiment of the present invention; fig. 2 is a disassembled view of the sewing machine 100 shown in fig. 1 with some elements omitted.

The sewing machine 100 includes a housing (not shown), a thread trimming mechanism 10, and a presser foot lifting mechanism 20. The housing is used to form a housing space for each mechanism in the sewing machine 100. The thread cutting mechanism 10 is used to perform a cutting action of the sewing thread. The presser foot lifting mechanism 20 is used for performing corresponding actions on a device for pressing the cloth.

The thread trimming mechanism 10 includes a cutter shaft crank 11 and a thread trimming cutter group 12. The cutter shaft crank 11 is connected with a driving part and a thread trimming cutter group 12. The arbor crank 11 is used for driving the thread trimmer cutter group 12 to run. The thread cutting blade group 12 is used for cutting off the sewing thread. The driving component is connected with and drives the cutter shaft crank 11 to operate so as to enable the thread cutting knife group 12 to carry out thread cutting action.

The knife shaft crank 11 is a waist-shaped crank, and two ends of the knife shaft crank are respectively fixed with the driving part and the thread trimming knife group 12. Specifically, the arbor crank 11 is provided with a connecting groove 111 along the length direction, and the connecting groove 111 is used for penetrating the driving component and the thread trimmer cutter group 12, so that the driving component and the thread trimmer cutter group 12 can be linked through the arbor crank 11.

Further, a fixing hole (not numbered) is formed in the middle of the arbor crank 11. The fixing hole is positioned on the side surface of the cutter shaft crank 11 and is opened in the direction vertical to the connecting groove 111. A threaded fastener (not numbered) is arranged in the fixing hole in a penetrating way and locks and fixes the cutter shaft crank 11 and the thread trimming cutter group 12. The thread trimming cutter set 12 is fixed with the cutter shaft crank 11 through the mutual matching between the threaded fastener and the fixing hole, so that the integral connection relation is compact and firm, and the processing of parts is convenient.

It is understood that in other embodiments, the thread trimmer 12 may be fixed to the knife crank 11 by other fastening methods, as long as the thread trimmer 12 can be fixed to the knife crank 11.

In one embodiment, the guillotine cutter assembly 12 includes a drive shaft 121, a rotating knife (not numbered), and a stationary knife (not numbered). One end of the driving shaft 121 is connected to the cutter shaft crank 11, and the other end is fixedly connected to the rotating cutter; the arbor crank 11 and the driving shaft 121 form circumferential linkage. The stationary blade is fixed to a housing of the sewing machine 100. The cutting edges of the rotating knife and the fixed knife are arranged oppositely; and both are disposed corresponding to the needle position of the sewing machine 100 so that the sewing thread can fall between the fixed knife and the rotary knife. The rotary knife can rotate around the axis of the driving shaft 121 relative to the fixed knife under the driving of the driving shaft 121, and the rotary knife and the fixed knife are matched with each other to cut off sewing threads.

Specifically, the drive shaft 121 is substantially rod-shaped, is rotatably provided in the housing of the sewing machine 100, and is capable of rotating about the axis of the drive shaft 121 itself. One end of the driving shaft 121 extends into and is fixed in the connecting groove 111, and the other end thereof penetrates through and is fixed with the rotating knife. The knife shaft crank 11 is shifted to make the driving shaft 121 rotate around the axis of the driving shaft 121, so that the rotating knife can be driven to rotate around the axis of the driving shaft 121.

It is understood that in other embodiments, the structural arrangement of the driving shaft 121 may be correspondingly arranged according to actual installation requirements, and is not particularly limited herein.

Specifically, the rotary knife has a substantially willow-leaf-shaped blade structure, and one end of the rotary knife having a larger width is fixed to the drive shaft 121. The fixed knife is approximately L-shaped. The side of the L-shaped long edge of the fixed knife facing the rotating knife is a knife edge and is arranged in parallel with the knife edge of the rotating knife, namely arranged along the radial direction of the driving shaft 121; the short side of the fixed blade "L" shape is fixed to the housing of the sewing machine 100 by a threaded fastener. The rotary knife is movable toward and away from the stationary knife by rotation of the drive shaft 121.

The rotary knife is in a knife-retracting state of staying at an initial position and not contacting with the fixed knife; the rotating knife also has a wire cutting state which moves towards the fixed knife, is in contact with the fixed knife and is in the resetting process. With such an arrangement, the thread trimming blade set 12 is simple in structure, can stably perform thread trimming, and is easy to maintain and replace parts.

It is understood that in other embodiments, the shape of the rotating knife or the fixed knife may be set according to actual requirements, as long as the rotating knife can move relative to the fixed knife under the action of the driving shaft 121, and the rotating knife and the fixed knife cooperate to cut the sewing thread.

In one embodiment, the thread trimming mechanism 10 further includes a blade carrier assembly 13. The thread trimmer 12 is attached to the housing of the sewing machine 100 by a carriage assembly 13. Specifically, the tool holder assembly 13 includes a tool holder 131 and an adjustment screw (not shown). The blade holder 131 is provided to the housing of the sewing machine 100 by an adjustment screw. The fixed knife is fixed to a housing of the sewing machine 100 by a knife holder 131. The drive shaft 121 is inserted into two shaft holes (not shown) of the tool holder 131 and is slidable relative to the tool holder 131. When the blade holder 131 slides with respect to the housing of the sewing machine 100, the position of the drive shaft 121 remains unchanged. With this arrangement, the drive shaft 121 can be stably rotatably coupled to the housing of the sewing machine 100.

As shown, the presser foot lifting mechanism 20 includes a presser foot shaft 21, a presser foot arm 22, and a presser foot plate 23. The presser foot shaft 21 is rotatably connected in the housing and rotates by taking the axis of the presser foot shaft as the center; one end of the presser arm 22 is connected to the presser shaft 21 and swings around the axis of the presser shaft 21 along with the rotation of the presser shaft 21; presser foot plate 23 is attached to one end of presser foot arm 22 relatively distant from presser foot shaft 21 and is disposed opposite to needle plate 101 of the housing. The presser foot shaft 21 is used for connecting the driving end and rotating around the axis of the presser foot shaft; the presser foot arm 22 is used for transmitting the rotation of the presser foot shaft 21 to the presser foot plate 23; the presser foot plate 23 is used to hold the cloth on the needle plate 101. When a driving member connected to the presser shaft 21 drives the presser shaft 21 to rotate, the presser shaft 21 drives the presser arm 22 to lift up or swing down, thereby pressing the presser plate 23 against the upper surface of the needle plate 101 or lifting the presser plate 23 away from the needle plate 101. Correspondingly, a presser foot shaft sleeve 24 is arranged in the shell of the sewing machine 100, and the presser foot shaft sleeve 24 is fixed in the shell. The presser foot shaft 21 is rotatably provided in the housing via a presser foot shaft sleeve 24.

The presser foot plate 23 is driven by the presser foot shaft 21 and the presser foot arm 22 to lift in a direction away from the needle plate 101, which is referred to as a presser foot lifting action hereinafter and corresponds to a state that the presser foot plate 23 is lifted; alternatively, the presser foot plate 23 is pushed down in the direction of the needle plate 101 by the presser shaft 21 and the presser arm 22, and the presser foot plate 23 moves toward the needle plate 101. The two types of presser foot plates 23 are in a state of being in a process of being lifted up or pressed down, and are both referred to as a presser foot lifting state. The position where presser foot shaft 21 and presser foot arm 22 are kept stationary and presser foot plate 23 is always at the lowest point is referred to as a pressed-down state.

In the existing sewing machine 100, the adjusting mechanism capable of adjusting the two functional mechanisms simultaneously has a complex structure, and the internal electromagnet structure has a high noise when cutting threads or lifting presser feet, and is easy to wear other components in the sewing machine 100.

Referring to fig. 3 and 4 together, fig. 3 is a disassembled schematic view of the joint adjusting mechanism 40 in the sewing machine 100 shown in fig. 1; fig. 4 is a schematic structural view of the driving cam 41 in the joint adjusting mechanism 40 shown in fig. 3.

In order to solve the above problem, the sewing machine 100 further includes a driving source 30 and a joint adjusting mechanism 40 correspondingly connected to the driving source 30. The joint adjusting mechanism 40 can be used to control the thread cutting mechanism 10 and the presser foot lifting mechanism 20 respectively, so as to control the sewing machine 100 to perform thread cutting operation or switch the presser foot lifting state. The structure of the joint adjusting mechanism 40 and the driving source 30 connected with the joint adjusting mechanism do not relate to the control of the electromagnet, so that the noise of the sewing machine 100 when executing the actions can be reduced, meanwhile, the abrasion to other parts in the sewing machine 100 can be reduced, and the service life of the sewing machine 100 can be prolonged. In the present embodiment, the driving source 30 may be any motor having power adapted to the sewing machine 100.

It should be explained that: the switching of the presser foot raising state means switching the presser foot plate 23 from the depressed state to the presser foot raising state, or switching the presser foot plate 23 from the presser foot raising state to the depressed state.

Specifically, as shown in fig. 4, the joint adjusting mechanism 40 includes a driving cam 41, a trimming driving link 42, and a presser foot driving assembly 43. The driving cam 41 is connected to an output end of the driving source 30, and outputs and transmits power of the driving source 30. The driving cam 41 includes a thread cutting area α and a presser foot lifting area β. The thread cutting driving connecting rod 42 forms a follow-up fit with the thread cutting area alpha and drives the thread cutting mechanism 10 connected with the thread cutting driving connecting rod 42 to operate. The presser foot driving component 43 forms a follow-up fit with the presser foot lifting area beta and drives the presser foot lifting mechanism 20 connected with the presser foot driving component 43 to operate. The thread cutting drive link 42 is used for outputting the power of the drive source 30 to the thread cutting mechanism 10; the presser foot drive assembly 43 outputs the power of the drive source 30 to the presser foot lifting mechanism 20. The driving cam 41 and the trimming driving link 42 connected thereto serve as a driving member of the trimming mechanism 10, and the driving cam 41 and the presser foot driving assembly 43 connected thereto serve as a driving member of the presser foot lifting mechanism 20.

When the driving cam 41 rotates with the output end along the direction indicated by the arrow F1 in fig. 3, the trimming driving link 42 forms a follow-up fit with the trimming area α of the driving cam 41, thereby driving the trimming mechanism 10 to operate. When the driving cam 41 rotates with the output end in the reverse direction indicated by the arrow F1 in fig. 3, the presser foot driving assembly 43 forms a follow-up fit with the presser foot lifting area β of the driving cam 41 and drives the presser foot lifting mechanism 20 to switch the presser foot lifting state.

It should be explained that: the driving cam 41 serves as a driving member, the profile shape of the driving cam 41 determines the motion law of a driven member matched with the driving cam, and the motion matching relationship of the driven member moving along with the profile shape of the driving cam 41 is called follow-up matching. For example, the motion trajectory of the trimming drive link 42 changes correspondingly with the change in the contour shape of the trimming area α of the drive cam 41. In the present embodiment, the contour shape refers to the outer contour shape of the drive cam 41, and it is understood that in other embodiments, the contour shape may be the shape of a groove or a hole formed in the drive cam 41.

Further, as shown in fig. 4, in order to allow the driving cam 41 to independently drive one of the thread trimming mechanism 10 and the presser foot lifting mechanism 20, an idle region γ is provided between the thread trimming region α and the presser foot lifting region β of the driving cam 41. When the trimming area α corresponds to the trimming drive link 42, the blank space γ corresponds to the presser foot drive assembly 43; when the presser foot lifting area β corresponds to the presser foot driving assembly 43, the blank line area γ corresponds to the thread cutting driving link 42. In this arrangement, the driving cam 41 independently drives the respective connected functional mechanisms (the thread trimming mechanism 10 and the presser foot lifting mechanism 20) through the functional regions (the thread trimming region α and the presser foot lifting region β).

It should be explained that: the above "corresponding to" in the first case means that the trimming area α and the trimming driving link 42 are abutting against each other, and the trimming driving link 42 forms a follow-up engagement with the trimming area α and drives the trimming mechanism to perform the trimming operation; this space-time travel area acts on the presser foot drive assembly 43 and is in a state of non-operation with respect to the presser foot drive assembly 43. Similarly, the presser foot lifting area β has substantially the same operation principle as the presser foot driving assembly 43, and is not described herein again.

Wherein, the idle zone γ is a segment of equal-diameter arc with the rotation point 411 of the driving cam 41 as the center of circle; the distance between the line cutting area alpha and the rotating point 411 of the driving cam 41 gradually increases along the direction far away from the idle area gamma; the distance between the presser foot lifting area β and the rotation point 411 of the drive cam 41 gradually increases in a direction away from the blank area γ. The arrangement is such that when the position of the thread cutting driving link 42 contacting the thread cutting area α is rotated along with the rotation of the driving cam 41, the position is gradually far away from or close to the rotation point 411 of the driving cam 41, and the position of the rotation point 411 of the driving cam 41 is not changed, then the position of the thread cutting driving link 42 contacting the thread cutting area α is correspondingly far away from or close to the rotation point 411 of the driving cam 41, so that the end of the thread cutting driving link 42 connected to the thread cutting mechanism 10 is correspondingly moved.

Similarly, the manner of driving the presser foot driving assembly 43 by the presser foot lifting area β is similar, and is not described herein. When the blank region γ corresponds to the thread cutting driving link 42 or the presser foot driving assembly 43, the position where the blank region γ contacts the thread cutting driving link 42 or the presser foot driving assembly 43 does not move away from or close to the rotation point 411 of the driving cam 41 along with the rotation of the driving cam 41; therefore, when the blank area γ corresponds to the thread cutting driving link 42 or the presser foot driving unit 43, the thread cutting driving link 42 or the presser foot driving unit 43 cannot be driven to operate, the thread cutting mechanism 10 is correspondingly in the thread retracting state, and the presser foot lifting mechanism 20 is correspondingly in the pressing state.

In one embodiment, the housing of the sewing machine 100 further includes a holder 102. The driving source 30 is mounted in the housing of the sewing machine 100 through a fixing base 102. The trimming drive link 42 and the partial presser foot drive assembly 43 are respectively hinged to the fixed seat 102. The position where the trimming drive link 42 is hinged to the fixing seat 102 is an end portion of the trimming drive link 42, and the position where the trimming drive link 42 contacts the drive cam 41 is approximately located in the middle of the trimming drive link 42. The rotation of the trimming driving link 42 around the fixed axis means that the trimming driving link 42 rotates around the hinge point thereof. When the trimming drive link 42 is in follow-up engagement with the trimming area α of the drive cam 41, the portion capable of acting on the trimming mechanism 10 is a position where the trimming drive link 42 is relatively far from the hinge point. Therefore, the driving end of the thread trimming drive link 42 moves in the same direction as the position where the thread trimming drive link 42 contacts the drive cam 41. The presser foot drive assembly 43 follows the movement of the drive cam 41 in a substantially similar manner and will not be described in detail herein.

In one embodiment, the positions where the trimming drive link 42 and the presser foot drive assembly 43 contact the drive cam 41 are located on opposite sides of the drive cam 41 above and below. The up-down position is a position in which the driving cam 41 is up-down as shown in fig. 3 or 4 when the sewing machine 100 is placed on a certain table in the forward direction. The trimming drive link 42 is in contact with the outer contour of the drive cam 41 via the trimming elastic member 424. And the presser foot driving assembly 43 below the driving cam 41 makes the presser foot driving assembly 43 always contact with the outer contour of the driving cam 41 through the presser foot elastic member 431.

It will be appreciated that in other embodiments, the cutting drive link 42 may also be configured to always contact the outer profile of the drive cam 41 via other return elements in the cutting mechanism 10. When the trimming driving link 42 is kept in contact with the driving cam 41 through other trimming resetting elements, the positions where the trimming driving link 42 and the presser foot driving assembly 43 are in contact with the driving cam 41 may be the left and right sides of the driving cam 41, and the installation position of the driving cam 41 should be rotated by 90 ° along the present direction; of course, the positions of the trimming drive link 42 and the presser foot drive assembly 43 in contact with the drive cam 41 may be arranged in other ways as long as the purpose of independently driving the trimming mechanism 10 and the presser foot lifting mechanism 20 can be achieved.

In one embodiment, the trimming drive link 42 includes a link portion 421 and a sliding portion 422. The link 421 is a substantially long straight rod; one end of the link 421 is hinged to the fixing base 102, and the other end forms a fork-shaped sliding part 422. The middle position of the link 421 contacts the driving cam 41 and drives the sliding part 422 to move correspondingly with the change of the contact position.

Further, in order to reduce the frictional loss between the link portion 421 and the driving cam 41, a trimming roller 423 is provided at a position where the link portion 421 contacts the driving cam 41. The thread trimming roller 423 is rotatably mounted to the link portion 421 and is rotatable relative to the link portion 421. When the link portion 421 contacts the outer contour of the driving cam 41 through the thread trimming roller 423, the rolling friction between the thread trimming roller 423 and the driving cam 41 can reduce the sliding friction between the link portion 421 and the driving cam 41 in direct contact, and thus the friction loss between the components can be reduced accordingly.

In one embodiment, when the driving cam 41 drives the trimming driving link 42 to move, the sliding portion 422 of the trimming driving link 42 forms a circular arc-shaped moving track around the hinge point thereof. If the sliding part 422 is directly hinged to the arbor crank 11, the sliding part 422 will pull the arbor crank 11 to form a circular arc-shaped motion track, and further may pull the driving shaft 121 to change the position of the central axis thereof. In order to enable the sliding part 422 to only drive the arbor crank 11 to rotate around the axis of the driving shaft 121 and release the movement of the arbor crank 11 along other directions, the sliding part 422 is provided with a sliding slot 4221; correspondingly, the connecting pin 112 of the arbor crank 11 is inserted into the connecting groove 111 at a position relatively far from the driving shaft 121, and the connecting pin 112 of the arbor crank 11 extends into the sliding groove 4221 and forms a sliding fit with the sliding groove 4221. The movement of the arbor crank 11 in the other direction can be released by sliding the connecting pin 112 in the slide slot 4221.

Further, a thread cutting elastic member 424 is disposed at a hinge point of the thread cutting driving link 42 and the fixing base 102. The thread cutting elastic member 424 is respectively abutted against the housing of the sewing machine and the thread cutting driving link 42. The elastic thread trimming member 424 is provided to allow the thread trimming driving link 42 to always abut against the outer contour of the driving cam 41.

In one embodiment, the presser foot drive assembly 43 includes a presser foot drive crank 432, a presser foot swing bar 433, and a pull rod 434. The presser foot driving crank 432 is hinged to the housing of the sewing machine 100, and is in follow-up fit with the presser foot lifting area β, and can rotate around the hinge point under the driving of the driving cam 41. The presser foot swing link 433 is connected to a presser foot shaft 21 in the presser foot mechanism, and is linked with the presser foot shaft 21 in the circumferential direction. Two ends of the pull rod 434 are respectively connected to the presser foot driving crank 432 and the presser foot lifting swing rod 433, and can drive the presser foot lifting swing rod 433 to rotate along with the rotation of the presser foot driving crank 432, so as to drive the presser foot lifting mechanism 20 to switch the presser foot lifting state. Preferably, the presser foot drive crank 432 is in contact with the outer profile of the drive cam 41 via the presser foot roller 4321. The arrangement of the presser foot roller 4321 is substantially the same as the function of the thread trimming roller 423, and will not be described herein.

In this embodiment, the two ends of the pull rod 434 are respectively bent to form hook portions, so that the presser foot driving crank 432 and the presser foot swing lever 433 are linked. Further, since an angle is formed between the presser foot swing link 433 and the rotation plane of the presser foot driving crank 432, the hook portion of the pull rod 434 is also formed with a corresponding angle, so that the pull rod 434 is conveniently connected to the presser foot driving crank 432 and the presser foot swing link 433.

In one embodiment, the presser foot drive assembly 43 further comprises a presser foot crank 435. The presser foot crank 435 is fixedly secured to the outer periphery of the presser foot shaft 21 and can drive the presser foot shaft 21 to rotate. The presser foot swing link 433 is adjacent to the presser foot crank 435 and sleeved on the presser foot shaft 21, and the presser foot swing link 433 can rotate relative to the presser foot shaft 21. The presser foot swing rod 433 drives the presser foot crank 435 to rotate by the abutting of the presser foot crank 435 and the presser foot swing rod 433, thereby driving the presser foot shaft 21 fixed with the presser foot crank 435 to rotate. When the presser foot lifting area β of the driving cam 41 acts on the presser foot driving crank 432, the presser foot swing rod 433 is driven by the pull rod 434 to rotate around the axis of the presser foot shaft 21, so that the presser foot crank 435 and the presser foot shaft 21 are driven to rotate along the first direction. The first direction is the direction indicated by the arrow F2 in fig. 3.

Preferably, the presser foot swing link 433 extends in a radial direction and forms a first connecting protrusion (not numbered); the presser foot crank 435 correspondingly forms a second connecting protrusion (not numbered). The first connecting convex part is abutted against the second connecting convex part.

In the present embodiment, the reset of the presser foot crank 435 can be reset by the elastic contact of the presser foot pressure adjusting mechanism to the presser foot arm 22 in the sewing machine 100.

The working process of the joint adjusting mechanism 40 is specifically described as follows:

when the driving end of the driving source 30 rotates in the counterclockwise direction indicated by an arrow F1 in fig. 3, the driving cam 41 drives the trimming driving link 42 to swing through the trimming roller 423, the connecting pin 112 slides in the sliding slot 4221 of the trimming driving link 42, and drives one end of the knife shaft crank 11 away from the driving shaft 121 to lift upwards, thereby completing the trimming operation; at this time, the presser foot lifting mechanism 20 does not operate. When the driving end of the driving source 30 rotates clockwise in the direction indicated by the arrow F1 in fig. 3, the driving cam 41 drives the presser foot driving crank 432 to move downward via the presser foot roller 4321, and further drives the presser foot crank 435 to rotate in the direction indicated by the arrow F2 in fig. 3 via the pull rod 434 and the presser foot swing rod 433, so as to complete the presser foot lifting operation by the rotation of the presser foot shaft 21, and at this time, the thread trimming mechanism 10 does not operate.

In the present embodiment, the reset of the presser foot lifting mechanism 20 can be performed by the elastic member presser foot shaft 21 and the presser foot driving crank 432 in the presser foot pressure adjusting mechanism.

It is understood that in other embodiments, the joint adjusting mechanism 40 is also applicable to other existing thread trimming mechanisms 10 or presser foot lifting mechanisms 20.

This allies oneself with transfers mechanism can correspondingly avoid the drawback that brings because the electro-magnet drive, makes the corresponding reduction of wearing and tearing of other parts in the sewing machine simultaneously to prolong sewing machine's life.

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

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims (10)

1. The joint adjusting mechanism is connected with a driving source of the sewing machine and used for controlling the operation of a thread cutting mechanism and a presser foot lifting mechanism of the sewing machine, the joint adjusting mechanism comprises a driving cam, a thread cutting driving connecting rod and a presser foot driving assembly, and the driving cam comprises a thread cutting area and a presser foot lifting area; the driving cam is connected to the output end of the driving source and can rotate along with the driving source; it is characterized in that the preparation method is characterized in that,

the trimming driving connecting rod comprises a connecting rod part and a sliding part which are fixed with each other, the connecting rod part and the trimming area of the driving cam are in follow-up fit, and the connecting rod part drives the sliding part to swing; the sliding part is in sliding fit with a cutter shaft crank of the thread trimming mechanism and drives the thread trimming mechanism to operate through the cutter shaft crank;

the presser foot driving component and the presser foot lifting area form follow-up matching and control the presser foot lifting mechanism to switch the presser foot lifting state.

2. The joint adjusting mechanism according to claim 1, further comprising a connecting pin inserted into the knife shaft crank, wherein the sliding portion is provided with a sliding groove, the sliding groove allows the connecting pin to extend into and be slidably connected to the sliding portion, and the trimming driving connecting rod shifts the knife shaft crank to rotate through the sliding fit of the connecting pin and the sliding groove.

3. The joint debugging mechanism of claim 1, further comprising a trimming roller rotatably disposed at a position where the trimming driving link contacts the driving cam, and the trimming driving link contacts the driving cam through the trimming roller.

4. The joint adjustment mechanism of claim 1, wherein the presser foot drive assembly comprises:

the presser foot driving crank is matched with the presser foot lifting area in a follow-up manner and can rotate around the fixed shaft under the driving of the driving cam;

the presser foot swing rod is connected to a presser foot shaft in the presser foot lifting mechanism and is in circumferential linkage with the presser foot shaft;

and two ends of the pull rod are respectively connected to the presser foot driving crank and the presser foot oscillating bar and can drive the presser foot oscillating bar to rotate along with the rotation of the presser foot driving crank so as to drive the presser foot lifting mechanism to switch the presser foot lifting state.

5. The joint debugging mechanism of claim 4, further comprising a presser foot roller, wherein the presser foot roller is arranged at a position where the presser foot driving crank is in contact with the driving cam in a rolling manner, and the presser foot driving component is in contact with the driving cam through the presser foot roller.

6. The joint debugging mechanism of claim 4, wherein the presser foot driving component further comprises a presser foot crank disposed between the presser foot swing rod and the presser foot shaft, the presser foot crank is fixedly sleeved on the presser foot shaft, and the presser foot crank abuts against the presser foot swing rod along a first direction.

7. The joint debugging mechanism according to claim 6, wherein the presser foot swing link extends in a radial direction and forms a first connecting convex portion, the presser foot swing link correspondingly forms a second connecting convex portion, and the first connecting convex portion abuts against the second connecting convex portion.

8. The joint debugging mechanism according to claim 4, wherein the presser foot driving assembly further comprises a presser foot elastic member, the trimming driving connecting rod and the presser foot driving crank are respectively located at two opposite sides of the driving cam, the trimming driving connecting rod is abutted against the trimming area through the trimming elastic member, and the presser foot driving crank is abutted against the presser foot lifting area of the driving cam through the presser foot elastic member.

9. The joint debugging mechanism according to claim 1, wherein the driving cam further comprises an idle zone disposed in the trimming zone and the presser foot lifting zone, and the idle zone corresponds to the presser foot driving component when the trimming zone of the driving cam corresponds to the trimming driving link; when the presser foot lifting area of the driving cam corresponds to the presser foot driving component, the idle area corresponds to the thread cutting driving connecting rod.

10. A sewing machine comprising a thread trimming mechanism, a presser foot lifting mechanism and a joint adjustment mechanism as claimed in any one of claims 1 to 9.

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