CN214142797U - Linkage adjusting mechanism and sewing machine with same - Google Patents

Abstract

The utility model relates to a linkage adjustment mechanism and have its sewing machine, this linkage adjustment mechanism include drive component, lift presser foot drive assembly and adjust drive assembly, wherein: a driving member connected to the movement output end of the driving source and rotatable with the driving source, the driving member including a first cam having a first region and a second cam having a second region; the first area is used for forming follow-up fit with the presser foot lifting driving assembly so as to drive the presser foot mechanism to act; and the adjusting drive assembly comprises a first adjusting connecting rod, a second adjusting connecting rod and an adjusting crank which are connected in sequence, the first adjusting connecting rod can be matched with the second area in a follow-up mode, and the second adjusting connecting rod drives the adjusting crank to swing so as to change the position of the feed dog on the feed dog rack.

Description

Linkage adjusting mechanism and sewing machine with same

Technical Field

The utility model relates to a sewing machine field especially relates to a linkage adjustment mechanism and have its sewing machine.

Background

The existing sewing machine structure often comprises a plurality of motion mechanisms for realizing different functions, such as a cloth feeding mechanism, a presser foot mechanism, a thread cutting mechanism, a lubricating mechanism and the like, and the motion mechanisms are coordinated and matched to complete the complete sewing function of the sewing machine.

In the structure of the sewing machine, the cloth feeding mechanism has the main function of continuously jacking and pulling the cloth on the needle plate through the reciprocating elliptical motion of the cloth feeding tooth frame, so that the cloth to be processed is continuously dragged and conveyed to the machine head to complete the whole feeding process; the main functions of the presser foot mechanism are to complete the dragging of the cloth in the feeding process in cooperation with the feed dog frame, to press the cloth in the sewing process so as to complete the sewing work smoothly, and to lift the presser foot after the sewing is completed so as to add the material. In the structure of the sewing machine disclosed in the related art, the lifting of the presser foot plate in the presser foot mechanism is generally driven by an electromagnet, and the driving and the orientation adjustment of the cloth feeding mechanism are realized by driving by a separate stepping motor.

The above-mentioned form of driving two mechanisms independently can make sewing machine obtain complete function, and can be matched with proper electric control detection means, and can implement correct matching between two mechanisms. However, the driving device and the transmission structure connected with the driving device occupy a large space, which easily causes the overall volume and size of the sewing machine to be larger.

SUMMERY OF THE UTILITY MODEL

In view of the above, it is desirable to provide a linkage adjusting mechanism and a sewing machine having the same, in which the feed dog frame and the presser foot mechanism can be driven by one driving member, and the sewing machine having the linkage adjusting mechanism has a smaller volume as a whole than a case where the two mechanisms are driven independently.

The utility model provides a first aspect provides a linkage adjustment mechanism for drive presser foot mechanism and the feed dog frame action in the sewing machine, linkage adjustment mechanism includes the drive component, lifts presser foot drive assembly and adjusts drive assembly, wherein:

the driving member is connected to a movement output end of a driving source and can rotate along with the driving source, and comprises a first cam and a second cam, wherein the first cam is provided with a first area, and the second cam is provided with a second area;

the first area is used for forming follow-up fit with the presser foot lifting driving assembly so as to drive the presser foot mechanism to act; and a process for the preparation of a coating,

the adjusting driving assembly comprises a first adjusting connecting rod, a second adjusting connecting rod and an adjusting crank which are connected in sequence, the first adjusting connecting rod can be matched with the second area in a follow-up mode, and the second adjusting connecting rod drives the adjusting crank to swing so as to change the position of the feed dog on the feed dog frame.

According to the arrangement, the first area and the second area on the first cam and the second cam are respectively used as the matching positions of the presser foot lifting driving assembly and the adjusting driving assembly, so that one driving source can drive the two cams to rotate, and the presser foot lifting driving assembly and the adjusting driving assembly are driven to move simultaneously; meanwhile, the adjusting driving assembly comprises a first adjusting connecting rod, a second adjusting connecting rod and an adjusting crank which are connected in sequence, and when the first adjusting connecting rod is matched with the second area in a follow-up mode, the adjusting crank can drive the cloth feeding tooth frame to move by a preset amplitude more sensitively. Compared with the mode of independently driving the feed dog frame to be adjusted through the electromagnetic driving pressure raising and pressing foot and the stepping motor, the integral linkage adjusting mechanism has fewer parts and more compact structure.

In one embodiment, the second area comprises a non-feeding area and a feeding area, and when the adjusting driving component is matched with the non-feeding area in a follow-up mode, the feed dog on the feed dog rack is kept in a non-feeding state; when the adjusting driving assembly is matched with the lower supply area in a follow-up mode, the feed dog on the feed dog rack is switched to a lower supply state.

In one embodiment, the second area comprises a gear adjusting area, and the adjusting driving assembly can be in follow-up fit with the gear adjusting area to drive the feed dog to rotate for gear shifting.

In one embodiment, the first region includes at least a first presser foot lifting region and a second presser foot lifting region corresponding to the non-lower supply region and the lower supply region, respectively, and the presser foot mechanism can be switched to the presser foot lifting state by the presser foot lifting driving assembly along with the rotation of the driving member when the presser foot lifting driving assembly is in follow-up fit with the first presser foot lifting region or the second presser foot lifting region.

In one embodiment, the first region further comprises a pressing holding area corresponding to the gear adjusting area, and the lifting presser foot driving assembly cooperates with the pressing holding area and holds the presser foot to be pressed down when the adjusting driving assembly is in follow-up cooperation with the gear adjusting area.

In one embodiment, one end of the adjusting crank is connected to an eccentric shaft for adjusting the rotation angle of the feed dog frame and is linked with the eccentric shaft in a circumferential direction.

In one embodiment, one end of the first adjusting link is provided with a second rotation center piece, and the first adjusting link can rotate around the central axis of the second rotation center piece.

In one embodiment, the first adjusting link is a bent rod, an adjusting roller for rolling-fitting with the second area is connected to the bent position of the rod, and the second rotation center piece and the second adjusting link are respectively located at two sides of the bent position.

So set up, compare in the first regulation connecting rod that the straight-bar set up, the member of buckling enables its whole length littleer, then has its regulation drive assembly self structure also more compact.

In one embodiment, the adjustment drive assembly further comprises a second resilient retainer for retaining the first adjustment link in follower engagement with the second region of the second cam.

In one embodiment, the lift and press foot drive assembly comprises:

the pressure raising and pressing foot crank is matched with the first area in a follow-up manner and can rotate around a fixed shaft under the driving of the driving member;

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

and the two ends of the pull rod are respectively connected to the presser foot lifting crank and the presser foot lifting swing rod, and the pull rod can drive the presser foot lifting swing rod to rotate along with the rotation of the presser foot lifting crank so as to drive the presser foot shaft to rotate.

In one embodiment, the presser foot lift drive assembly further comprises a first resilient member for maintaining said presser foot lift crank in follow-up engagement with said first region of said drive member.

The utility model discloses the second aspect still provides a sewing machine, sewing machine includes foretell linkage adjustment mechanism.

In the linkage adjusting mechanism and the sewing machine, the linkage adjusting mechanism drives the first cam and the second cam in the driving component to rotate simultaneously through a single driving source, and the presser foot lifting driving component for controlling the presser foot lifting and the adjusting driving component for driving the cloth feeding tooth frame to rotate are respectively matched with the first cam and the second cam in a follow-up manner, so that the presser foot mechanism and the cloth feeding tooth frame can form a matching relation through the contour curve design of the first area and the second area on the two cams, the presser foot lifting and the presser foot lifting are simultaneously supplied and not supplied, and the cloth feeding tooth frame is adjusted in multiple gears, compared with the traditional form of independent driving of the presser foot lifting driving component and the adjusting driving component, the volume size of the whole linkage adjusting mechanism is smaller, the structure of the sewing machine is more compact, and simultaneously compared with some simple linkage schemes, the linkage adjusting mechanism in the utility model can take into consideration of multiple use working conditions of the sewing machine, rather than simply mechanically stacking multiple motions. In addition, including the first adjusting connecting rod, the second adjusting connecting rod and the adjusting crank that connect in order in the linkage adjusting part, this kind of transmission form makes, even first adjusting connecting rod is less with the regional follow-up complex motion stroke of second, the adjusting crank also can sensitively drive the motion that the feed dog frame took place to predetermine the range to satisfy the adjustment of feed dog position.

Drawings

Fig. 1 is a schematic structural view of a sewing machine provided by the present invention with a housing and a part of the structure thereof hidden, showing a linkage adjusting mechanism and mechanisms associated therewith according to an embodiment;

FIG. 2 is a schematic structural view of a related structure of the cloth feeding mechanism in the structure shown in FIG. 1;

FIG. 3 is a schematic view of the linkage adjustment mechanism of FIG. 1 showing components associated with lifting the presser foot and its connection to the presser foot mechanism;

FIG. 4 is a schematic view of the linkage adjustment mechanism of FIG. 1 in relation to the components associated with the actuation of the adjustment mechanism and its connection to the eccentric shaft of the adjustment mechanism;

FIG. 5 is an exploded view of the adjustment mechanism and feed dog;

fig. 6 is a schematic view of a partial structure of the interlocking adjustment mechanism of the embodiment shown in fig. 1, in which a drive source, a bracket, and the like are omitted;

FIG. 7 is a schematic diagram of the relative position between the driving member and the two rollers in the linkage adjustment mechanism of the embodiment shown in FIG. 1, and the outline area division of the two cams in the driving member is also indicated;

fig. 8 is a schematic structural view of the sewing machine provided by the present invention with the housing and a part of the structure thereof hidden, showing another embodiment of the linkage adjusting mechanism and the mechanisms associated therewith;

fig. 9 is a schematic view of a part of the structure of the interlocking adjustment mechanism shown in fig. 8, in which the structures of a drive source, a bracket, and the like are omitted;

FIG. 10 is a first perspective view of a variant embodiment of the drive member;

FIG. 11 is a second perspective view of the drive member illustrated in FIG. 10;

fig. 12 is a schematic structural view of the sewing machine provided by the present invention with the housing and a part of the structure thereof hidden, wherein the linkage adjustment mechanism shown in the figure is different from the linkage mechanism of the embodiment shown in fig. 8 only in the driving member;

fig. 13 is a schematic view of a part of the structure of the interlocking adjustment mechanism shown in fig. 12, in which the structures of a drive source, a bracket, and the like are omitted;

FIG. 14 is a schematic structural view of yet another linkage adjustment mechanism, which is shown as differing from the linkage mechanism of the embodiment shown in FIG. 1 only at the drive member;

fig. 15 is a schematic view of a partial structure of the interlocking adjustment mechanism shown in fig. 14, in which structures such as a driving source and a bracket are omitted, and a contour region division of the driving member is also indicated;

FIG. 16a is a schematic view of the feed dog carrier in a normal operating condition;

FIG. 16b is a schematic view of the feed dog frame in a thick material working state;

fig. 16c is a schematic view of the feed dog in a thin material working state.

100. A linkage adjusting mechanism;

11. a drive source;

12. a drive member; 121. a first cam; 1211. a first pressure foot lifting area; 1212. a second pressure foot lifting area; 1213. pressing down the holding area; 122. a second cam; 123. a chute;

13. a presser foot lifting drive assembly; 131. lifting a presser foot crank; 1311. a first rotating center member; 132. lifting a presser foot roller; 133. a pull rod; 134. lifting a presser foot swing rod; 135. a first resilient retaining member;

14. adjusting the drive assembly; 141. a first adjusting link; 1411. a second rotating center member; 142. a second adjusting link; 143. adjusting a crank; 144. adjusting the roller; 145. a second resilient retaining member; 146. selecting a connecting piece;

15. a support;

200. a presser foot mechanism; 21. a presser foot shaft; 22. a presser foot arm; 23. a foot pressing plate;

300. an adjustment mechanism;

31. an eccentric shaft; 310. a concentric segment; 311. an eccentric section; 32. adjusting the sliding block; 33. a first retainer ring; 34. a second retainer ring;

400. a cloth feeding mechanism; 41. a first transmission assembly; 42. a second transmission assembly; 43. a third transmission assembly; 44. a feed dog frame; 441. an active dental framework; 4411. a driving tooth; 442. a differential dental articulator; 4421. differential teeth; 443. an extension arm; 444. adjusting the sliding chute;

500. a main shaft; 600. a needle plate.

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 belong to the protection scope of the present invention.

It will be understood that when an element is referred to as being "mounted on" another element, it can be directly mounted 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.

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 in the description of the invention herein 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.

Referring to fig. 1 and 2, the present invention provides a sewing machine, which includes a main shaft 500, wherein the main shaft 500 is connected to an external driving source (e.g., a rotary driving source such as a motor) and can be driven by the external driving source to rotate. The sewing machine may further include a presser foot mechanism 200, an adjusting mechanism 300, a cloth feeding mechanism 400, a needle plate 600, and a head (the head is hidden in the drawing), wherein: the cloth feeding mechanism 400 and the head are connected to the main shaft 500, and can perform a predetermined operation under the driving of the main shaft 500. The cloth feeding mechanism 400 is used for conveying the cloth to be sewn to a proper position on the needle plate 600; the presser foot mechanism 200 is used for pressing the cloth conveyed by the cloth feeding mechanism 400; the head is used for sewing the cloth conveyed by the cloth conveying mechanism 400.

Of course, besides the above mentioned mechanisms, the sewing machine may also include other mechanisms, such as a thread passing mechanism, a lubricating mechanism, a thread cutting mechanism, a material pricking mechanism, a thread hooking mechanism, a material cutting mechanism, etc., and the multiple mechanisms are coordinated and matched with each other to realize the complete function of the sewing machine.

The cloth feeding mechanism 400 comprises a first transmission assembly 41, a second transmission assembly 42, a third transmission assembly 43 and a cloth feeding tooth rack 44, wherein: the feed dog 44 includes a driving dog 441 and a differential dog 442; the first transmission assembly 41 is connected to a corresponding shaft section of the main shaft 500 and is used for driving the feed dog 44 (including the driving dog 441 and the differential dog 442) to reciprocate along the Z-axis direction indicated in fig. 1; the motion of the second transmission assembly 42 comes from the first transmission assembly 41 and can drive the differential dental articulator 442 to reciprocate along the Y-axis direction indicated in fig. 1 under the motion input; the motion of the third transmission assembly 43 comes from the second transmission assembly 42, and the driving rack 441 is driven by the motion input to reciprocate along the Y-axis direction indicated in fig. 1.

It will be appreciated that in the illustrated embodiment, the Z-axis direction is vertical, or perpendicular to the upper surface of the needle board 600; the Y-axis direction is a horizontal direction or a direction along which all the feed dogs on the feed dog holder 44 are arranged. In other embodiments, the two directions can be redesigned according to actual needs.

Both the active dental articulator 441 and the differential dental articulator 442 of the feed dental articulator 44 have a motion along the Z-axis direction and a motion along the Y-axis direction, so that the motions in both directions are combined to make the feed dental articulator 44 perform a reciprocating circular motion in a plane defined by the Y-axis and the Z-axis, and in particular, in the present embodiment, the motion amplitude of the feed dental articulator 44 along the Y-axis direction is greater than the motion amplitude along the Z-axis direction, so that the feed dental articulator 44 performs a reciprocating elliptical motion in the plane defined by the Y-axis and the Z-axis, and the elliptical motion makes the feed dental articulator 44 drag the cloth in the Y-axis direction, thereby implementing the function of feeding the cloth.

The motion of the driving rack 441 and the differential rack 442 along the Z-axis direction are synchronized, and the motion along the Y-axis direction is driven by the third transmission assembly 43 and the second transmission assembly 42 respectively to allow a differential motion, by which a better sewing effect can be obtained by the sewing machine.

In current sewing machine, work feed mechanism generally designs to the processing demand of certain specific thickness cloth, when the thickness of cloth compares when having the thickness difference in this specific thickness, can have the circumstances that the power of dragging of feed dog frame to the cloth is not enough or single work feed volume is too big at sewing in-process, and this can make the cloth layering/stitch excessively dense, or the fold appears in the cloth. In order to make the sewing machine better adapt to the sewing operation of the cloth with different thicknesses, the sewing machine can be further provided with an adjusting mechanism 300, the adjusting mechanism 300 can correspondingly adjust the inclination angle of the feed dog rack 44 according to the thickness degree of the cloth, so as to change the inclination angle of the feed dog on the feed dog rack 44 (the feed dog is a tooth-shaped structure protruding on the feed dog rack 44, the inclination angle of the feed dog rack 44 changes along with the change of the upper surface of the needle plate 600), meanwhile, the inclined rotation of the feed dog rack 44 also causes the height of the upper end of the feed dog exceeding the upper surface of the needle plate 600 to change, and the feed dog adapts to the cloth with different thickness degrees through the height and inclination angle change of the feed dog.

Referring to fig. 2, the feed dog 44 is provided with an extension arm 443 at an end away from the needle plate 600, and the driving dog 441 and the differential dog 442 are provided with two extension arms 443 spaced up and down, so that an adjusting slide 444 extending along the length direction of the feed dog 44 (or the Y-axis direction indicated in fig. 2) is formed between the two sets of extension arms 443, and the adjusting slide 444 is used for setting the adjusting mechanism 300.

Referring to fig. 1 and 5, the adjusting mechanism 300 includes an eccentric shaft 31, an adjusting slider 32, a first retainer ring 33, and a second retainer ring 34, wherein: the eccentric shaft 31 includes a concentric section 310 and an eccentric section 311, and the motion for driving the motion of the adjustment mechanism 300 can be input from the concentric section 310 to the eccentric shaft 31, thereby rotating the eccentric shaft 31 around the concentric section 310; the adjusting slide block 32 is correspondingly arranged in the adjusting slide groove 444 shown in fig. 2 and can slide in the adjusting slide groove 444, and the adjusting slide block 32 is mounted on the eccentric section 311 of the eccentric shaft 31.

When the eccentric shaft 31 rotates, the adjustment slider 32 can move in two directions simultaneously: the sliding along the adjustment runner 444, and the movement of biasing the feed dog 44 in a direction perpendicular to this sliding direction, the latter movement causing the raising or lowering of the end of the feed dog 44 provided with the extension arm 443 (indicated in fig. 2), thus causing an angular rotation of the feed dog 44 as a whole about its rotational connection with the main shaft 500.

Referring to fig. 2, since the active dental articulator 441 and the differential dental articulator 442 extend in the Y-axis direction at different lengths, the active teeth 4411 on the active dental articulator 441 and the differential teeth 4421 on the differential dental articulator 442 are spaced back and forth in the Y-axis direction. The needle plate 600 is provided with notches (not marked in the figure) for the driving teeth 4411 and the differential teeth 4421 to extend out. Further, in combination with fig. 5, when one end of the feed dog holder 44 (i.e., the adjusting chute 444) away from the feed dog is lifted or pressed down by the adjusting slider 32, the height of the active dog 4411 and the differential dog 4421 exposed out of the upper surface of the needle plate 600 and the inclination angle of the teeth are different, so as to form the effect of adapting to sewing of cloth with different thicknesses, the "change of the feed dog position" referred to in the present invention includes the height of the active dog 4411 and the differential dog 4421 exposed out of the upper surface of the needle plate 600 and the inclination angle of the teeth.

Specifically, referring to fig. 16a to 16c, fig. 16a is a schematic diagram illustrating the feed dog 44 in a normal operation state, fig. 16b is a schematic diagram illustrating the feed dog 44 in a thick operation state, and fig. 16c is a schematic diagram illustrating the feed dog 44 in a thin operation state. In the figure, sign S indicates an elliptical motion trajectory of the driving teeth 4411 and the differential teeth 4421, V indicates a tangential direction of the driving teeth 4411 and the differential teeth 4421 when cutting the upper surface of the needle plate 600, and F indicates a direction of elastic force of the driving teeth 4411 and the differential teeth 4421 against the cloth.

(1) When the feed dog 44 is in the normal operating state: the cloth feeding tooth rack 44 is not lifted up and pressed down, and keeps a horizontal state, at the moment, the driving teeth 4411 and the differential teeth 4421 are kept horizontally and level, the driving teeth 4411 and the differential teeth 4421 synchronously contact with the cloth, therefore, the direction of the elastic force F acted on the cloth by the driving teeth 4411 and the differential teeth 4421 is the same as the tangential angle direction when the driving teeth 4411 and the differential teeth 4421 cut the upper surface of the needle plate 600, and is a vertical direction, and the state is suitable for sewing and processing the cloth with ordinary thickness and moderate hardness.

(2) When the feed dog 44 is in the thick material working state: when the thick material working condition needs to be adapted, the feed dog 44 needs to be rotated to an inclined state as shown in fig. 5. The cloth feeding tooth rack 44 is inclined by adjusting one end (namely, the position of an adjusting chute 444 marked in fig. 2) of the cloth lifting tooth rack 44 on the slide block 32, which is far away from the cloth feeding tooth, so that the height of the driving tooth 4411 is lower than that of the differential tooth 4421 (when the swing angle is the same, the driving tooth 4411 is closer to the swing center of the cloth feeding tooth rack 44, therefore, the height of the movement of the driving tooth 4411 to the needle plate 600 is smaller than that of the differential tooth 4421 which is relatively far away from the swing center of the cloth feeding tooth rack 44), at this time, the direction of the elastic force F acted on the cloth by the driving tooth 4411 and the differential tooth 4421 still keeps the vertical direction, but the tangential angle direction of the driving tooth 4411 and the differential tooth 4421 when cutting a working plane is not kept the vertical direction any more, but the cloth feeding is performed in a beveling manner;

because the height of the driving tooth 4411 is lower than that of the differential tooth 4421, the differential tooth 4421 ascends above the needle plate 600 before the driving tooth 4411 and contacts with the cloth in advance, and the cloth feeding efficiency of the differential tooth 4421 is higher than that of the driving tooth 4411, when the driving tooth 4411 and the differential tooth 4421 carry the cloth, the differential tooth 4421 has a certain catching effect relative to the driving tooth 4411, so that the cloth is pushed, the cloth feeding of thick materials such as multiple layers, peduncles and seams is smooth, the needle pitch is uniform, and the sewing quality is better.

(3) When the feed dog 44 is in the thin material working state: similarly, as still shown in connection with fig. 5, when it is desired to accommodate a gauze or similar thin material condition, it is desired to reverse the rotation of the feed dog 44 to the inclined state compared to the previous condition. At this time, the adjusting slider 32 presses down one end (i.e. the adjusting chute 444 marked in fig. 2) of the feed dog frame 44 away from the feed dog to incline the feed dog frame 44, so that the height of the driving dog 4411 is higher than that of the differential dog 4421, at this time, the direction of the elastic force F acting on the cloth by the driving dog 4411 and the differential dog 4421 still keeps the vertical direction, but the tangential direction of the driving dog 4411 and the differential dog 4421 when cutting out the upper surface of the needle plate 600 does not keep the vertical direction any more, and the driving dog 4411 and the differential dog 4421 perform the feeding in a beveling manner;

because the height of the driving tooth 4411 is higher than that of the differential tooth 4421, the driving tooth 4411 ascends above the needle plate 600 before the differential tooth 4421 and contacts with the cloth in advance, and the cloth feeding efficiency of the driving tooth 4411 is higher than that of the differential tooth 4421, when the driving tooth 4411 and the differential tooth 4421 feed the cloth, the driving tooth 4411 has a certain separation effect relative to the differential tooth 4421, so that a dragging effect on the cloth is formed, thin materials such as gauze and the like are smooth and not wrinkled, and the sewing quality is better.

The three states of the feed dog 44 shown in fig. 16a to 16c correspond to three gear positions referred to as feed dogs, wherein: the position of the feed dog frame corresponding to the working condition of the thin material is called as the first gear position of the feed dog frame; the position of the feed dog frame corresponding to the common working condition is called as the second gear position of the feed dog frame; the position of the feed dog frame corresponding to the thick material working condition is called as the third gear position of the feed dog frame. The switching process of the sewing machine between the three states is called a three-gear adjusting process of the feed dog frame or gear adjusting of the feed dog frame. In other embodiments, the feed dog may have more subdivided gears, that is, the selectable gears are not more than the above three gears, but the adjustment principle is substantially the same as that described above, and the details are not described here.

Further, when the cloth is placed on the needle plate 600, and in some other necessary cases, the feed dog 44 is deflected to a state where the active dog 4411 and the differential dog 4421 are substantially dropped below the needle plate 600, which is hereinafter referred to as a down-feed state. The gear adjustment and the lower supply of the feed dog 44 are both realized by biasing the feed dog 44 to rotate so as to drive the position change of the feed dog thereon.

With continued reference to that shown in fig. 1, presser foot mechanism 200 includes presser foot shaft 21, presser foot arm 22, and presser foot plate 23, wherein: the presser foot shaft 21 is able to rotate about its own axis, thereby causing the presser foot arm 22 to lift up or swing down, thereby pressing the presser foot plate 23 against the upper surface of the needle plate 600 or lifting the presser foot plate 23 away from the needle plate 600. It can be understood that the operation of lifting the presser foot plate 23 in a direction away from the needle plate 600 by the presser shaft 21 and the presser arm 22 is hereinafter referred to as a presser foot lifting operation, and the state in which the corresponding presser foot plate 23 is lifted is referred to as a presser foot lifting state. Accordingly, the state in which the presser foot plate 23 is pressed against the needle plate 600 is referred to as a pressed-down state.

Before sewing is started, the cloth to be sewn needs to be placed on the needle plate 600, and at the moment, the cloth feeding tooth frame 44 needs to be switched to a lower supply state so as to be convenient for placing the cloth above the needle plate; in the middle of sewing, there are some occasions of adding materials in the middle, for example, when sewing a trademark on the cloth, the sewing process needs to be suspended, the trademark is put on the cloth on the needle plate 600, then the sewing is continued, and in the occasion of adding materials in the middle, the presser foot lifting action needs to be carried out, so that the trademark and the like can be put under the presser foot plate 23 and at the proper position on the cloth on the needle plate 600; at the same time, however, the feed dog 44 needs to maintain contact with the cloth during this midway feeding, i.e. the feed dog is not down-fed. Otherwise, when the presser foot mechanism 200 is in the presser foot lifting state, the feed dog frame 44 is switched to the lower supply state, and when the material feeding is finished and the sewing is continued, the feed dog on the feed dog frame 44 slightly pushes the cloth when extending out of the upper surface of the needle plate 600 again, and the subsequent sewing causes the stitch on the cloth to change, so that the aesthetic property of the sewing fabric is greatly reduced.

In other words, the sewing machine needs to have the following three operating states: (1) the pressure foot is lifted and simultaneously supplied downwards so as to meet the requirement of discharging; (2) the presser foot is lifted without supplying, so that the requirement of feeding materials in midway is met, and the problem that the subsequent sewing effect is influenced due to the fact that the cloth moves because the cloth feeding tooth is contacted with the cloth again after the cloth feeding tooth is not contacted with the cloth for a short time before and after stopping in midway is avoided; (3) the feed dog holder 44 can be adjusted among a plurality of stages so that the distance between the feed dog and the presser foot plate 23 and the angle of the feed dog are adapted to different cloth thicknesses, and the presser foot mechanism 200 is kept in a pressed-down state during the stage adjustment.

In order to achieve the above three operating states of the sewing machine, the most direct way is to drive the sewing machine by independent drives. For example: in applicant's own prior application, the presser foot lifting action is typically driven by an electromagnet; the applicant has proposed two ways of switching the state of the feed dog carrier: firstly, a mode that a stepping motor drives an eccentric shaft is utilized to drive a cloth feeding tooth rack to rotate to an inclined state or reset, so that a common working state (moderate cloth thickness) and a thick material working state are realized; on the basis, the applicant finds that when the cloth feeding tooth rack is suitable for thin material sewing, the cloth feeding tooth rack can be driven to rotate reversely, so that the detection and the electric control of the rotation angle of the eccentric shaft are added in the later scheme, and the gear adjustment of the cloth feeding tooth rack is realized.

Although the sewing machine can obtain the three working states through the form of independent driving, the driving device and the transmission structure connected with the driving device occupy larger space, and the overall volume size of the sewing machine is easy to be larger. Thus, the applicant has proposed: the pressure foot lifting action and the lower supply are realized simultaneously. In the scheme, a lever for lifting the pressure foot and a downward moving driving crank for driving the tooth frame to swing are connected to the same pressure foot lifting wrench through a first lifting hook and a second lifting hook respectively, so that when the pressure foot lifting wrench rotates, the pressure foot lifting wrench and the tooth frame can be driven to swing through the first lifting hook and the second lifting hook simultaneously to realize downward supply.

However, in specific uses it was found that: because first lifting hook and second lifting hook are connected to same lift presser foot spanner on, in order to satisfy the stroke needs of lifting the presser foot, should lift the swing stroke of presser foot spanner and predetermine, consequently, in this structure, the dental articulator can only have two kinds of operating modes of reset condition and lower confession state, can't realize adapting to the gear adjustment of cloth thickness difference. Meanwhile, generally, when the swing of the tooth frame is supplied to the action of the presser foot lifting and moving through the same structure, the tooth frame and the presser foot plate are in linkage relation, namely, the movement of the presser foot lifting and moving wrench inevitably causes the preset action of both the presser foot plate and the cloth feeding tooth frame. However, in the above-described midway feeding condition, it is necessary to hold the feed dog rack without supplying the feed dog rack while lifting the presser foot, that is, at this time, it is necessary to operate the presser foot and to supply the feed dog rack without supplying the feed dog rack, which is contradictory to the way that the same driving structure drives the feed dog rack and the feed dog rack to be linked. Therefore, in the conventional sewing machine, it is impossible to simultaneously obtain the above three operating states by one driving structure.

In order to solve the contradiction, the present invention firstly provides a linkage adjusting mechanism 100, and the linkage adjusting mechanism 100 can make the sewing machine have the above three working states at the same time.

Referring to fig. 1 and 3 to 7, the linkage adjusting mechanism 100 includes a driving source 11, a driving member 12 connected to a movement output end of the driving source 11, a presser foot lifting driving assembly 13 for driving a presser foot shaft 21 in a presser foot mechanism 200 to rotate, and an adjusting driving assembly 14 for driving an eccentric shaft 31 in an adjusting mechanism 300 to rotate.

In the illustrated embodiment, the drive source 11 is mounted to the bracket 15, and the pivot axis s1 of the drive member 12 is also fixed relative to the bracket 15. The drive member 12 includes a first cam 121 and a second cam 122 fixed relative to each other for driving the presser foot lifting drive assembly 13 and the adjustment drive assembly 14, respectively.

Referring to fig. 1 and 3, the related structure of the first cam 121 for driving the presser foot lifting drive assembly 13 is shown. With reference to the orientation shown in the figures, the drive member 12 is capable of being rotated clockwise or counterclockwise by a drive source (indicated in FIG. 1). The presser foot lifting driving assembly 13 comprises a presser foot lifting crank 131, a presser foot lifting roller 132, a pull rod 133 and a presser foot lifting swing rod 134, and the presser foot lifting crank 131, the pull rod 133 and the presser foot lifting swing rod 134 are all of a substantially rod-shaped structure, wherein:

the presser foot lifting crank 131 has a first centre of gyration 1311 for pivotal connection to the support 15 about which first centre of gyration 1311 the presser foot lifting crank 131 is able to pivot; the presser foot lifting roller 132 is rotatably connected to one end of the presser foot lifting crank 131, which is relatively far from the first pivoting center 1311, and the presser foot lifting roller 132 can maintain contact with the outer contour of the first cam 121, so that a cam mechanism is formed between the first cam 121, the presser foot lifting crank 131 and the presser foot lifting roller 132, in which the first cam 121 is a driving member, the presser foot lifting crank 131 is a driven member, and contact between the two is achieved by the presser foot lifting roller 132.

One end of the presser foot lifting and swinging rod 134 is connected to the presser foot shaft 21 in the presser foot mechanism 200, and the one end of the presser foot lifting and swinging rod 134 can drive the presser foot shaft 21 to rotate in the arrow direction indicated in fig. 3; a pull rod 133 is connected between the presser foot lifting pendulum 134 and the presser foot lifting crank 131 for motion transmission between the two rods. In order to maintain the reliable contact between the presser foot lifting roller 132 and the outer contour of the first cam 121, in the illustrated embodiment, the presser foot lifting driving assembly 13 further includes a first elastic retaining member 135, and the first elastic retaining member 135 is configured as a torsion spring and is used for lifting one end of the presser foot lifting lever 134 connected to the pull rod 133, so that one end of the presser foot lifting crank 131 connected to the presser foot lifting roller 132 is kept in lifting contact with the first cam 121.

The outer profile of the first cam 121 includes a first region, which may be a continuous segment of the outer profile of the first cam 121, and which is adapted to cooperate with the presser foot drive assembly 13. The first region is functionally divided, including a press-up foot region and a press-down holding region 1213, wherein: when the presser foot lifting driving assembly 13 is matched with the presser foot lifting area in a follow-up manner, the presser foot lifting driving assembly 13 completes the action, so that the presser foot lifting mechanism 200 is switched to a presser foot lifting state; when the presser foot raising drive assembly 13 is in follow-up engagement with the hold-down area 1213, the presser foot raising drive assembly 13 does not operate, and the presser foot mechanism 200 is held in a hold-down state.

In one embodiment, the first region includes a first presser foot lifting region 1211, a second presser foot lifting region 1212, and a lower pressure holding region 1213 connected therebetween. Specifically, in the initial state, the presser foot lifting roller 132 may stop in the hold-down area 1213, and when the presser foot lifting roller 132 moves in the hold-down area 1213, the presser foot lifting lever 134 is not actuated, and the presser foot mechanism 200 is held in the above-defined hold-down state; the first cam 121 rotates clockwise or counterclockwise, so that the presser foot lifting roller 132 contacts with any one of the first presser foot lifting area 1211 and the second presser foot lifting area 1212, and at this time, the presser foot lifting swing rod 134 can drive the presser foot mechanism 200 to perform the presser foot lifting action.

Referring to fig. 1 and 4, the structure of the second cam 122 for driving the adjustment driving assembly 14 is shown. Referring to the arrow direction indicated in the drawing, when the driving member 12 is rotated by the driving source 11, the second cam 122 rotates clockwise about the direction indicated in fig. 4. The adjustment drive assembly 14 includes a first adjustment link 141, a second adjustment link 142, an adjustment crank 143, an adjustment roller 144, and a second elastic holder 145 (labeled in fig. 1) which are arranged in a substantially rod-like shape and are connected in series. Wherein:

the first adjusting link 141 has a second rotation center piece 1411 for connecting to the bracket 15, and the first adjusting link 141 is rotatable about a center axis of the second rotation center piece 1411; one end of the first adjusting link 141 away from the second rotation center 1411 is connected to one end of the second adjusting link 142, and the adjusting roller 144 is rotatably connected to the vicinity of the middle portion of the first adjusting link 141, in the illustrated embodiment, the first adjusting link 141 is configured as a bent rod, and the adjusting roller 144 is rotatably connected to the bent portion thereof; the other end of the second adjusting link 142 is connected to one end of an adjusting crank 143; the other end of the adjusting crank 143 is connected to the eccentric shaft 31 in the adjusting mechanism 300 for rotating the eccentric shaft 31.

A second resilient retaining member 145 is mounted on the bracket 15 (both shown in fig. 1) for maintaining the adjustment roller 144 in contact with the outer profile of the second cam 122 in a follower engagement. The second cam 122 is provided with a second region, which may also be provided with a continuous section of the profile of the second cam 122. The adjustment roller 144 is adapted to follow the second region, and when the driving member 12 rotates around the axis s1, the second cam 122 rotates and causes the adjustment roller 144 to roll in the second region, so that the first adjustment link 141 is driven to swing around the central axis of the second rotation center 1411 by the rolling contact of the two, and further, the second adjustment link 142 moves substantially in the direction indicated by the arrow in the figure, and the adjustment crank 143 and the eccentric shaft 31 connected thereto are driven to rotate in the direction indicated in the figure, thereby performing the operation of the adjustment mechanism 300, in this structure, the driving member 12 is also a driving member, and the first adjustment link 141 is a driven member.

With reference to fig. 1, 6 and 7, only one driving source 11 of the interlocking adjustment mechanism 100, and therefore, the driving member 12 rotates with the driving source 11, three operating states of the sewing machine can be achieved: the presser foot mechanism 200 is kept in a pressed-down state while the presser foot is lifted and the feed is not lifted and the feed dog 44 is adjusted in the gear position. Specifically, as shown with reference to the markings in fig. 7, the second region on the second cam 122 includes a no-under feed region a, a shift adjustment region b, a transition region c, and an under feed region d. As described above, in the initial state, the pressure raising/lowering roller 132 is stopped in the pressure holding area 1213, and the adjustment roller 144 is located in the shift position adjustment area b.

(1) When the adjusting roller 144 rotates within the range of the gear adjusting area b, the adjusting drive assembly 14 can be jogged to rotate the feed dog to any one of a plurality of gear positions. As indicated previously, in one embodiment, the feed dog has an angle corresponding to three conditions of normal thickness cloth, thin material and thick material, and therefore, correspondingly, the feed dog has three gear positions. When the adjustment roller 144 moves in the gear adjustment area b, the presser foot lifting roller 132 moves in the hold-down area 1213, the presser foot lifting drive assembly 13 does not operate, so that the presser foot mechanism 200 is held in the hold-down state, and the sewing work of the cloth can be smoothly performed by the head of the sewing machine after the gear adjustment is completed. In addition, during sewing, gear adjustment is sometimes required, and at this time, gear switching of the feed dog holder can be performed in the above manner.

(2) When the material needs to be added halfway, the driving source 11 drives the driving member 12 to rotate a certain angle, the adjusting roller 144 moves in the non-downward supply area a of the second cam 122 (referring to the orientation shown in fig. 7, the second cam 122 rotates counterclockwise), and at the same time, the pressure raising roller 132 moves from the downward pressing holding area 1213 to the first pressure raising area 1211 of the first cam 121, so as to realize the pressure raising action. In the process, the adjusting roller 144 passes through the gear adjusting area b and then enters the non-downward supply area a, at the moment, the feed dog frame is kept at the third gear (thick material working condition) position, and the presser foot plate is lifted at the same time, so that the purpose of lifting the presser foot and simultaneously preventing downward supply is realized. After the feeding is finished, the action of the pressure lifting foot resets, and the cloth feeding tooth rack is also reset to the original gear.

It will be appreciated that no matter which of the three positions the feed dog is in before, during the midway feeding, it is first adjusted to three (i.e. the thick stock condition) and then, with further rotation of the drive member 12, the adjustment roller 144 is moved from this three position into the no-lower feed area a, the feed dog being held in the three position without further rotation. The mode well solves the contradiction that the presser foot is lifted but the feed is not supplied downwards, if the material is added midway, the presser foot is lifted and the feed dog frame is supplied downwards, when the sewing is started again, and the feed dog frame returns to a certain gear again, the feed dog can drive the cloth to generate micro motion, and the sewing effect can be influenced. In the embodiment with a plurality of gears, when the material is added in the midway, the feed dog frame is adjusted to any gear, and the feed dog on the feed dog frame can keep contacting with the cloth at the gear.

(3) When cloth needs to be added to the needle plate, the presser foot needs to be lifted and the cloth needs to be fed downwards, at this time, the driving source 11 drives the driving member 12 to rotate clockwise (with reference to the orientation in fig. 7), and the adjusting roller 144 moves through the transition region c and then enters the lower feeding region d, so that the adjusting mechanism 300 can adjust the cloth feeding tooth rack to a lower feeding state; at the same time, the presser foot lifting roller 132 moves to the second presser foot lifting area 1212 of the first cam 121, so as to realize the presser foot lifting action.

It can be understood that although there are a plurality of gears of the feed dog frame, relatively speaking, the thickness change of the cloth is not obvious, therefore, the profile length of the gear adjusting area b (or the central angle corresponding to the gear adjusting area b) is not large, and the profile length of the lower supply area d is long (or the central angle corresponding to the lower supply area d is large) in order to match the stroke requirement of the presser foot lifting, and through the arrangement of the transition area connected between the gear adjusting area b and the lower supply area d, the effect of buffering and noise reduction can be achieved, and the feed dog frame is prevented from generating noise or moving too fast in the state switching process. Specifically, the adjustment roller 144 on the first adjustment link 141 is in follow-up engagement with the second cam 122, and if the transition region c is not provided, at a position between the shift position adjustment region b and the lower supply region d, it may occur that the adjustment roller 144 is temporarily disengaged from the follow-up engagement with the second cam 122, and when the two are in contact engagement again, the adjustment roller 144 collides with the second cam 122, generating noise, and reducing the service lives of the adjustment roller 144 and the second cam 122.

Referring to fig. 8 and 9, another embodiment of a ganged adjustment mechanism 100 is shown in fig. 8 and 9, the ganged adjustment mechanism 100 being capable of performing substantially the same function. Which differs from the linkage adjustment mechanism of the embodiment shown in fig. 1-6 only in that the structure of the adjustment drive assembly 14 differs slightly. Specifically, referring to fig. 9, the adjusting driving assembly 14 shown in the figure comprises an adjusting crank 143, and an adjusting roller 144 connected to one end of the adjusting crank 143, and the other end of the adjusting crank 143 is connected to the concentric section 310 of the eccentric shaft 31 to drive the eccentric shaft 31 to rotate to complete the gear adjustment of the feed dog carrier.

In contrast to the previous embodiment, the embodiment shown in fig. 8 and 9 corresponds to omitting the first and second adjusting links 141 and 142 of the adjusting drive assembly 14 and directly mounting the adjusting roller 144 to the adjusting crank 143. In response to the above structural change of the adjustment driving assembly 14, the two ends of the second elastic holding member 145 are respectively pulled on the bracket 15 and the adjustment crank 143 to keep the adjustment roller 144 reliably attached to the outer profile of the second cam 122.

The difference between the two embodiments of the linkage adjustment mechanism 100 can be seen: the modified embodiments of the presser foot lift drive assembly 13 and the adjustment drive assembly 14 may be varied as long as the correct transfer of motion from the drive member 12 to the adjustment mechanism 300 and the presser foot mechanism 200 is achieved. Suitably, the resilient retaining members for retaining the presser foot roller 132 and the adjustment roller 144 in secure engagement with the respective outer contours of the drive member 12 may also be selected from springs or torsion springs as required, and suitably selected mounting positions as required during design.

Furthermore, in the two embodiments of the linkage adjustment mechanism 100, the followers in cooperative contact with the two cams in the driving member 12 are rollers, which can reduce contact wear between the driving member 12 and the presser foot lifting crank 131 (shown in fig. 3 and 9), the first adjustment link 141 (shown in fig. 3), and the adjustment crank 143 (shown in fig. 9). In other embodiments, bearings may be used in place of the pressure foot roller and adjustment roller structures to reduce contact friction. In addition, the presser foot lifting roller 132 and the adjustment roller 144 may be omitted without considering wear.

Referring to fig. 10 and 11, there is shown another embodiment of the structure of the driving member 12, which differs from the driving member 12 in the two previous embodiments of the linkage adjustment mechanism 100 only in that: the first cam 121 and the second cam 122 are both provided with a slide groove 123, and the profile shape of the slide groove 123 is completely the same as that shown in fig. 7, so that the driving member 12 shown in the figure can be applied to the two interlocking adjustment mechanisms 100.

In the case of the drive member 12 shown in fig. 10 and 11, the pressure raising and lowering roller 132 and the adjustment roller 144 form a sliding portion which can be engaged with the groove section of the slide groove 123 in a following manner, but since such a sliding portion can rotate by itself, the friction with the slide groove 123 is in the form of rolling friction. It is understood that in this embodiment with the sliding slot 123, the pressure raising and pressing roller 132 and the adjusting roller 144 may be configured as a non-rotatable sliding part structure, and directly slide and rub with the sliding slot 123. Further, compared to the form of fitting the outer contour of the cam, when the slide groove 123 is fitted, the presser foot lifting roller 132 and the adjustment roller 144 can be kept from being disengaged from the slide groove 123 at all times, and therefore, when the driving member 12 shown in fig. 10 and 11 is used, two elastic holders can be omitted.

It should be noted that in the aforementioned three embodiments of the linkage adjusting mechanism 100, the driving members 12 each include a two-part cam structure, in other embodiments, the driving members 12 may include two mutually independent cams, and both cams are mounted on both motion output ends of the output shaft of the same driving source 11, for example, in one embodiment, the driving source 11 is configured as a motor, the output shaft of the motor extends to both sides, and two cams disposed separately may be respectively connected to both end sides of the output shaft.

In addition, in the cam mechanism, the cam is used as a driving part, the outer contour shape of the sliding groove on the cam or the cam determines the motion rule of the driven part matched with the cam, and the motion matching relationship that the driven part moves along with the outer contour shape of the sliding groove on the cam or the cam is called follow-up matching. For example, the fitting relationship between the adjustment crank 143 to which the adjustment roller 144 is attached and the outer ring of the second cam 122, the fitting relationship between the first adjustment link 141 to which the adjustment roller 144 is attached and the outer ring of the second cam 122, the fitting relationship between the presser foot lifting crank 131 to which the presser foot lifting roller 132 is attached and the first cam 121, and the like in the present invention are all referred to as the follow-up fitting between the corresponding lever and the corresponding cam. Similarly, when these levers are directly in contact engagement with the first cam 121 and the second cam 122 without rollers, this is also referred to as follower engagement of the corresponding lever with the corresponding cam. In addition, in the scheme of providing the sliding groove 123 on the cam, the corresponding rod may be held in the sliding groove 123 through other forms, and the matching relationship still belongs to the following matching along with the regular movement of the shape of the sliding groove 123.

Referring to fig. 12 and 13, there is shown a further alternative embodiment of the ganged adjustment mechanism 100, which is substantially identical in construction to the ganged adjustment mechanism 100 shown in fig. 8 and 9, except that: the drive member 12 employs a single cam structure. Those skilled in the art will appreciate that the drive member 12 of fig. 12 and 13 is also suitable for use in the coordinated adjustment mechanism 100 of fig. 1-6.

Referring to fig. 13, when the driving member 12 rotates clockwise, the adjusting roller 144 moves to fit the gear adjusting area on the driving member 12, and drives the adjusting crank 143 to move to adjust the gear of the feed dog rack; when the driving member 12 rotates counterclockwise, the adjusting roller 144 is attached to the lower feeding area of the driving member 12, and drives the adjusting crank 143 to move to switch the feed dog carrier to the lower feeding state, and at the same time, the presser foot lifting roller 132 is attached to the driving member 12 to move, so as to realize the presser foot lifting operation.

In the embodiment shown in fig. 12 and 13, one end of the adjustment crank 143 cooperates with a second area on the second drive member 12, the other end being provided with a connection portion for connection to the eccentric shaft 31. The connecting portion is provided with a selector link 146, and the adjustment crank 143 can be connected/disconnected with the concentric section 310 of the eccentric shaft 31 through the selector link 146. In the illustrated embodiment, the connection portion is provided as an open ring, and the option connector 146 is inserted through the opening of the ring. When the selective link 146 releases the opening of the ring member, the engaging relationship between the ring member and the eccentric shaft 31 is released, and the eccentric shaft 31 does not rotate with the movement of the adjustment crank 143.

When the working condition of feeding in midway is met, the selective connecting piece 146 can be adjusted, for example, the connecting part arranged as an annular piece is loosened to be in a sleeved state with the eccentric shaft 31, so that the connecting relation between the adjusting crank 143 and the eccentric shaft 31 is temporarily disconnected, at the moment, the eccentric shaft 31 does not deflect along with the swinging of the adjusting crank 143, namely, the linkage adjusting mechanism 100 only can drive the presser foot to lift up, but does not drive the feed dog frame to rotate.

In addition, the selective connecting piece 146 can be loosened temporarily, the relative angle between the adjusting crank 143 and the eccentric shaft 31 can be adjusted, and then the eccentric shaft 31 can be pressed again, and the swinging of the adjusting crank 143 after the angle adjustment can not be driven to rotate, so that the cloth feeding tooth rack can not rotate while the foot pressing plate is lifted.

Referring to fig. 14 and 15, there is shown a further alternative embodiment of the linkage adjustment mechanism 100, which is substantially identical in construction to the linkage adjustment mechanism 100 shown in fig. 1-6, except that: the drive member 12 employs a single cam structure having another profile. It will be appreciated that although the illustrated embodiment employs the structure shown in fig. 1 and 6 for the adjustment drive assembly 14, the drive member 12 of fig. 14 and 15 is equally applicable to the linkage adjustment mechanism 100 shown in fig. 8 and 9.

Referring to fig. 15, the driving member 12 is driven by the driving source 11 in fig. 14 to rotate clockwise or counterclockwise, and three working states of the sewing machine can be realized as the linkage adjusting mechanism 100 in fig. 1 to 6: the feed dog 44 is not supplied and the gear position is adjusted when the presser foot is lifted and the presser foot is supplied and lifted. In particular, with reference to the numbering in fig. 15, the cam structure as the driving member 12 mainly comprises a five-segment outer profile (for the sake of convenience corresponding to the embodiment in fig. 1 to 6, the profiles for achieving the same function are given the same numbering): the second area for engaging the adjustment roller 144 includes a non-lower supply area a, a shift adjustment area b, and a lower supply area d; the first region for engaging the presser foot lifting roller 132 includes a first presser foot lifting region 1211 and a second presser foot lifting region 1212.

(1) In the initial state, the presser foot raising roller 132 is stopped in the pressing holding area 1213, and the adjustment roller 144 is located in the shift adjustment area b correspondingly.

(2) When the adjusting roller 144 rotates within the range of the gear adjusting area b, the adjusting driving assembly can be slightly moved to rotate the feed dog frame to any one of the three gear positions, meanwhile, the presser foot lifting roller 132 moves in the pressing holding area 1213, the presser foot lifting driving assembly does not act, so that the presser foot mechanism 200 is kept in the pressing state, and when the gear adjustment is completed, the head of the sewing machine can smoothly perform sewing work. In addition, during sewing, gear adjustment is sometimes required, and at this time, gear switching of the feed dog holder can be performed in the above manner.

(3) When the material needs to be added halfway, the driving source 11 drives the driving member 12 to rotate by a certain angle, the adjusting roller 144 moves in the non-downward supply area a of the second cam 122 (referring to the orientation shown in fig. 15, the second cam 122 rotates clockwise), and at the same time, the presser foot lifting roller 132 moves the first presser foot lifting area 1211 from the pressing holding area 1213, so that the presser foot lifting action is realized. In the process, the adjusting roller 144 passes through the gear adjusting area b and then enters the non-downward supply area a, at the moment, the feed dog frame is kept in a non-downward supply state, and the foot pressing plate is lifted up, so that the purpose of lifting the foot pressing plate and not supplying the foot pressing plate at the same time is achieved.

(4) When cloth needs to be added to the needle plate, the presser foot needs to be lifted and the cloth needs to be fed downwards, at this time, the driving source 11 drives the driving member 12 to rotate anticlockwise (with reference to the orientation in fig. 15), and the adjusting roller 144 moves to the lower feeding area d, so that the adjusting mechanism 300 can adjust the cloth feeding tooth rack to the lower feeding state; at the same time, the presser foot lifting roller 132 moves to the second presser foot lifting area 1212, so as to realize the presser foot lifting action.

Referring to fig. 14, the first region and the second region are disposed spaced apart or adjacent to each other in the axial direction in which the drive member 12 rotates with the drive source 11. In the illustrated embodiment, the driving member 12 is provided as a body having a uniform cross section, that is, the cross section of the driving member 12 is the same at every point along the axial direction in which the driving member 12 rotates with the driving source 11. In this arrangement, the first and second regions may be offset or adjacent to one another back and forth along the axis, i.e., in the illustrated manner, the pressure and lift roller 132 is in follow-up engagement with the illustrated front outer contour of the drive member 12, while the adjustment roller 144 is in follow-up engagement with the illustrated rear outer contour of the drive member 12, which allows the two regions of the drive member 12 to be set back from one another and facilitates the installation of the coordinated adjustment mechanism 100.

It will be appreciated that although the adjustment drive assembly of fig. 14 and 15 employs the linkage arrangement shown in fig. 1 to 6, the drive member 12 of fig. 14 and 15 is equally applicable to the linkage adjustment mechanism 100 of fig. 8 and 9.

The utility model also provides a sewing machine, this sewing machine contains the linkage adjustment mechanism 100 of any preceding embodiment. Moreover, due to the use of the linkage adjusting mechanism 100, the sewing machine simultaneously has the functions of lifting the presser foot, supplying the presser foot downwards, lifting the presser foot, not supplying the presser foot downwards and adjusting the working state of the gear of the cloth feeding tooth frame.

It should be noted that: the utility model discloses in through the regional ingenious design of each profile of drive component 12 for a driving source 11 can drive the nimble switching of three kinds of states of sewing machine. Compared with the mode that the functions are realized by mutually independent driving sources in the prior structure, the sewing machine of the utility model can obtain more compact volume; and simultaneously, the utility model provides a driving source 11 has actually realized three kinds of functions: the gear adjustment of the cloth feeding presser foot, the rotation of the cloth feeding tooth rack are provided for the presser foot lifting action of the presser foot mechanism. In comparison, in the prior art, one motor can only realize the pressure foot lifting and downward supply at the same time, but cannot realize the gear adjustment of the feed dog rack and the pressure foot lifting but not downward supply. The utility model provides a scheme has solved well and has lifted the presser foot and keep the work feed dental articulator not supplying down and keep in the position of third gear (thick material operating mode promptly), when adapting to the work condition of adding material midway, can be when lifting the presser foot blowing, avoids lifting the removal that causes the cloth on supplying the back once more under the dental articulator.

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 (12)

1. A linkage adjustment mechanism for driving a presser foot mechanism (200) and a feed dog carrier (44) in a sewing machine to act, characterized in that the linkage adjustment mechanism (100) comprises a driving member (12), a presser foot lifting driving assembly (13) and an adjustment driving assembly (14), wherein:

the drive member (12) is connected to a movement output end of a drive source (11) and is rotatable with the drive source (11), the drive member (12) includes a first cam (121) and a second cam (122), the first cam (121) has a first region, and the second cam (122) has a second region;

the first area is used for forming follow-up fit with the presser foot lifting driving component (13) so as to drive the presser foot mechanism (200) to act; and a process for the preparation of a coating,

the adjusting driving assembly (14) comprises a first adjusting connecting rod (141), a second adjusting connecting rod (142) and an adjusting crank (143), the first adjusting connecting rod (141) can be matched with the second area in a follow-up mode, and the second adjusting connecting rod (142) drives the adjusting crank (143) to swing so as to change the position of the feed dog on the feed dog frame (44).

2. The coordinated adjustment mechanism according to claim 1, wherein the second area comprises a non-feeding area (a) and a feeding area (d), when the adjustment drive component (14) is in follow-up fit with the non-feeding area (a), the feed dog on the feed dog holder (44) is kept in a non-feeding state; when the adjusting driving component (14) is matched with the lower feeding area (d) in a following mode, the feed dog on the feed dog rack (44) is switched to a lower feeding state.

3. The linkage adjustment mechanism according to claim 1, characterized in that the second region comprises a gear adjustment zone (b), with which the adjustment drive assembly (14) can be in a follow-up engagement for bringing about a rotation of the feed dog (44) for gear shifting.

4. The ganged adjustment mechanism according to claim 2, wherein the first area comprises at least a first presser foot lifting area (1211) and a second presser foot lifting area (1212) corresponding to the non-lower supply area (a) and the lower supply area (d), respectively, the presser foot mechanism (200) being switchable to a presser foot lifting state by the presser foot lifting drive assembly (13) in accordance with the rotation of the drive member (12) when the presser foot lifting drive assembly (13) is in follow-up engagement with the first presser foot lifting area (1211) or the second presser foot lifting area (1212).

5. The ganged adjustment mechanism according to claim 3, wherein the first region further comprises a hold-down area (1213), the hold-down area (1213) corresponding to the gear adjustment area (b), the presser foot lifting drive assembly (13) engaging the hold-down area and holding a presser foot down when the adjustment drive assembly (14) is in follow-up engagement with the gear adjustment area (b).

6. The coordinated adjustment mechanism according to any one of claims 1 to 5, wherein one end of the adjustment crank (143) is connected to an eccentric shaft (31) for adjusting the rotation angle of the feed dog carrier (44), and is circumferentially coordinated with the eccentric shaft (31).

7. The linkage adjustment mechanism according to claim 6, characterized in that one end of the first adjustment link (141) is provided with a second centre of rotation piece (1411), the first adjustment link (141) being rotatable around a centre axis of the second centre of rotation piece (1411).

8. The linkage adjusting mechanism according to claim 7, wherein the first adjusting link (141) is provided as a bent rod, and an adjusting roller (144) for rolling-fitting with the second area is connected to the bent portion of the rod, and the connection portions of the second rotation center (1411) and the second adjusting link (142) are respectively located at both sides of the bent portion.

9. The linkage adjustment mechanism according to claim 6, wherein the adjustment drive assembly (14) further comprises a second resilient retainer (145) for retaining the first adjustment link (141) in follower engagement with the second region of the second cam (122).

10. A ganged adjustment mechanism according to any of claims 1-5, characterized in that the presser foot lift drive assembly (13) comprises:

the pressure raising and pressing foot crank (131) is matched with the first area in a follow-up mode and can rotate around a fixed shaft under the driving of the driving component (12);

the presser foot lifting swing rod (134) is connected to a presser foot shaft (21) in the presser foot mechanism (200) and is in circumferential linkage with the presser foot shaft (21);

and two ends of the pull rod (133) are respectively connected to the presser foot lifting crank (131) and the presser foot lifting swing rod (134), and the pull rod can drive the presser foot lifting swing rod (134) to rotate along with the rotation of the presser foot lifting crank (131) so as to drive the presser foot shaft (21) to rotate.

11. The ganged adjustment mechanism according to claim 10, wherein the presser foot lift drive assembly (13) further comprises a first resilient retainer (135) for retaining the presser foot lift crank (131) in follow-up engagement with the first region of the drive member (12).

12. A sewing machine, characterized in that it comprises a coordinated adjustment mechanism according to any one of claims 1-11.

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