CN219621373U - Adjusting mechanism for presser foot lifting device, presser foot lifting device and sewing machine - Google Patents

Abstract

The utility model relates to an adjusting mechanism for a presser foot lifting device, the presser foot lifting device and a sewing machine, wherein the adjusting mechanism comprises a first transmission arm and a second transmission arm, the first transmission arm and the second transmission arm are respectively provided with a first connecting part and a second connecting part, the first transmission arm is also provided with a first adjusting part, the second transmission arm is also provided with a second adjusting part which is matched with the first adjusting part, the adjusting mechanism also comprises an adjusting part which is matched with the first adjusting part and the second adjusting part, and the first transmission arm and the second transmission arm are coaxially hinged to a bracket through a hinge structure, so that the first connecting part, the second connecting part and the adjusting part form a triangle structure; the adjusting mechanism not only can replace the existing transmission lever to play a role in transmitting power in the presser foot lifting device, but also can effectively adjust the position of the presser foot in the presser foot lifting device so as to meet the requirement of high-precision sewing.

Description

Adjusting mechanism for presser foot lifting device, presser foot lifting device and sewing machine

Technical Field

The utility model relates to the technical field of sewing machines, in particular to an adjusting mechanism for a presser foot lifting device, the presser foot lifting device and a sewing machine.

Background

Sewing machines are commonly used sewing devices that typically utilize one or more sewing threads to form one or more stitches on a material to interweave or stitch one or more layers of material; the sewing machine can be used for sewing fabrics such as cotton, hemp, silk, wool, artificial fiber and the like and products such as leather, plastics, paper and the like, and the sewn stitch is neat, beautiful, flat and firm, has high sewing speed, is simple and convenient to use, and has wide application in the sewing industry.

The presser foot lifting device on the sewing machine is mainly used for lifting or putting down the presser foot, and in the running process, the sewing thread can be arranged on the cloth in a penetrating way through the lifting and the falling of the presser foot lifting device so as to realize sewing. The existing presser foot lifting device generally comprises a transmission lever, as shown in fig. 1, wherein the transmission lever is provided with two transmission arms which are fixedly connected together and form a certain included angle with each other, and one ends of the two transmission arms are respectively provided with a first connecting part and a second connecting part for connecting other transmission parts or transmission mechanisms, as shown in fig. 1. When in assembly, the transmission lever is rotatably connected to the bracket (or the shell) through a hinge structure, and meanwhile, the transmission lever is arranged in the presser foot lifting device through the first connecting part and the second connecting part in a transmission mode, and the transmission lever is not only used for transmission, but also mainly used for changing the transmission direction. In practice, in some presser foot lifting devices, a transmission lever is disposed between a driving motor and a connecting rod, for example, a presser foot and presser foot pressure adjusting device for a sewing machine disclosed in chinese patent CN110983646B, and the transmission lever is disposed between the driving motor and the connecting rod, and is used for changing linear power along a vertical direction into linear power along a length direction of the connecting rod, so that in the presser foot lifting device, the driving motor can drive the transmission lever to rotate, thereby driving the connecting rod to reciprocate along the length direction thereof by using the transmission lever, and driving a pressing rod connected with the transmission lever to lift/lower along the vertical direction by using the connecting rod, so as to finally achieve the purpose of lifting or lowering the presser foot. In some presser foot lifting devices, a transmission lever is disposed between a connecting rod and a pressing rod, for example, in chinese patent CN111379083a, a presser foot lifting device, a sewing machine, and a control method for the presser foot lifting device, where the transmission lever is disposed between the connecting rod and the pressing rod, and is used for changing linear power along the length direction of the connecting rod into linear power along the vertical direction, so that in the presser foot lifting device, a driving motor can drive the connecting rod to reciprocate along the length direction, and the movement of the connecting rod drives the transmission lever to rotate, so as to drive the pressing rod in driving connection with the transmission lever to lift/lower along the vertical direction, and finally achieve the purpose of lifting or lowering the presser foot.

However, due to the influence of factors such as manufacturing errors, assembly errors, abrasion in the running process and the like, the existing transmission lever is difficult to meet the requirement of high-precision sewing, and needs to be solved.

Disclosure of Invention

The first aspect of the utility model solves the problem that the prior transmission lever is difficult to realize high-precision sewing due to structural limitation, and provides an adjusting mechanism which not only can replace the prior transmission lever to play a role in transmitting power in a presser foot lifting device, but also can effectively adjust the position of a presser foot in the presser foot lifting device so as to meet the requirement of high-precision sewing, and has the main conception that:

an adjusting mechanism for a presser foot lifting device comprises a first transmission arm and a second transmission arm, wherein the first transmission arm and the second transmission arm are respectively provided with a first connecting part and a second connecting part,

the first transmission arm is also provided with a first adjusting part, the second transmission arm is also provided with a second adjusting part which is matched with the first adjusting part,

also comprises an adjusting component which is matched with the first adjusting part and the second adjusting part,

the first transmission arm and the second transmission arm are coaxially hinged to a bracket through a hinge structure, so that the first connecting part, the second connecting part and the adjusting part form a triangle structure,

the adjusting component is used for locking the first transmission arm and the second transmission arm so as to enable the first transmission arm and the second transmission arm to synchronously act, and is used for unlocking the first transmission arm and the second transmission arm so as to adjust the relative positions of the first transmission arm and the second transmission arm. In the scheme, the first transmission arm and the second transmission arm are two parts and can be independently formed; the first transmission arm and the second transmission arm are coaxially hinged to the bracket through the hinge structure, so that the first transmission arm and the second transmission arm can respectively coaxially rotate relative to the bracket, and the problem that the relative positions of the first transmission arm and the second transmission arm are adjustable is solved; the first connecting part and the second connecting part are respectively arranged on the first transmission arm and the second transmission arm so as to be respectively connected with other transmission parts in the presser foot lifting device by the first connecting part and the second connecting part, thereby solving the problems of convenient installation and transmission; the first adjusting part, the second adjusting part and the adjusting part are configured, and the first connecting part, the second connecting part and the adjusting part form a triangular structure, so that on one hand, the first transmission arm and the second transmission arm can be locked through the cooperation of the first adjusting part, the second adjusting part and the adjusting part, the first transmission arm and the second transmission arm can act synchronously as a whole, the transmission power is transmitted in the presser foot lifting device, and the adjusting mechanism can replace a transmission lever in the existing presser foot lifting device; on the other hand, the first transmission arm and the second transmission arm can be unlocked through the cooperation of the first transmission arm and the second transmission arm, so that the first transmission arm and the second transmission arm can rotate relatively, the included angle between the first transmission arm and the second transmission arm can be adjusted, the purpose of adjusting the relative positions of the first connecting part and the second connecting part is achieved, the position of the presser foot can be adjusted, and the problem that the position of the presser foot in the existing presser foot lifting device is inconvenient to adjust is effectively solved; after adjusting in place, the first transmission arm and the second transmission arm are locked by the adjusting part, so that the sewing machine is very convenient, and the requirement of high-precision sewing can be met. In addition, because the included angle between the first transmission arm and the second transmission arm is adjustable, the transmission requirements of different presser foot lifting devices can be met, and the universality can be remarkably improved.

Further, the first connecting portion and the second connecting portion are respectively configured at one ends of the first transmission arm and the second transmission arm, and the first adjusting portion and the second adjusting portion are respectively configured at the other ends of the first transmission arm and the second transmission arm. Not only is favorable to optimizing the structure, but also is favorable to finely adjusting the contained angle between first transmission arm and the second transmission arm, is favorable to improving the regulation precision.

In order to solve the problem of locking/unlocking the first transmission arm and the second transmission arm, preferably, the first adjusting part is a bar hole, the second adjusting part is a through hole for adapting to the bar hole, and the adjusting part is a bolt pair for adapting to the through hole;

or the first adjusting part is a through hole, the second adjusting part is a strip hole matched with the through hole, the adjusting part is a bolt pair matched with the through hole,

or, the first adjusting part and the second adjusting part are mutually matched strip holes respectively, and the adjusting part is a bolt pair matched with the strip holes.

Preferably, the strip hole is an arc-shaped strip hole, and the circle center corresponding to the arc-shaped strip hole coincides with the rotation center of the first transmission arm.

In order to solve the problem of coaxially hinging the first transmission arm and the second transmission arm to the bracket, in some schemes, the hinging structure comprises a hinging piece and hinging holes which are respectively formed in the first transmission arm and the second transmission arm and are matched with the hinging piece, the first transmission arm and the second transmission arm are respectively sleeved on the hinging piece through the hinging holes, and the hinging piece is fixed to the bracket.

For the convenience of fixing the hinge, preferably, the hinge comprises a hinge column and a head arranged at one end of the hinge column, a limit groove is formed in the side face of the hinge column, a support is provided with an assembly hole adapted to the hinge column and a lock hole vertically communicated with the assembly hole, the lock hole is provided with an internal thread, and the hinge is locked in the assembly hole through a bolt inserted into the limit groove.

In other schemes, the hinge structure comprises a hinge post arranged on the bracket, a nut and hinge holes respectively formed in the first transmission arm and the second transmission arm and adapted to the hinge post, the first transmission arm and the second transmission arm are respectively sleeved on the hinge post through the hinge holes, the hinge post is provided with external threads adapted to the nut, the nut is in threaded connection with the hinge post, and the first transmission arm and the second transmission arm are rotationally restrained on the hinge post.

Preferably, the first connecting portion is a connecting hole or a connecting column, and/or the second connecting portion is a connecting hole or a connecting column.

To simplify the structure, further, the first transmission arm is a sheet-like structure, and/or the second transmission arm is a sheet-like structure.

The second aspect of the present utility model aims to solve the problem of improving the motion precision of the presser foot, and further comprises a limiting structure, wherein the limiting structure comprises a first limiting part arranged on the first transmission arm or the second transmission arm, and a second limiting part constructed on the bracket and adapted to the first limiting part, and the second limiting part is constructed on the motion path of the first limiting part and is used for blocking the first limiting part, so that the first limiting part and the second limiting part form limiting fit. Through the cooperation of first spacing portion and second spacing portion, can play spacing effect to the action process of first transmission arm and second transmission arm, not only can accurate control presser foot's minimum position, presser foot's initial pressure etc. can prevent moreover that the excessive problem of action from appearing because of factors such as inertia, be favorable to further improving the action precision of presser foot.

For making spacing position adjustable, preferably, first spacing portion includes stop screw, and connect in the journal stirrup of first transmission arm or second transmission arm, the journal stirrup is constructed and is had the screw hole of adaptation stop screw, and stop screw threaded connection is in the screw hole, and stop screw's tip and the spacing portion of second form spacing cooperation. In this scheme, can realize the spacing to first transmission arm and second transmission arm through the cooperation of stop screw and second spacing portion for first transmission arm and second transmission arm can only move spacing position department, and through the screw hole with stop screw threaded connection in the journal stirrup, make when in actual use, can adjust stop screw's position, thereby can adjust stop screw and the relative position of second spacing portion, finally realize spacing position adjustable purpose, not only can satisfy the position adjustment demand of presser foot, be favorable to improving this adjustment mechanism's commonality moreover.

Further, the second limiting part is also provided with a groove which is matched with the limiting screw, and the end part of the limiting screw corresponds to the notch profile of the groove. In this scheme, the setting of recess not only can avoid interfering the spacing cooperation of stop screw and notch profile, makes stop screw's tip can support in the profile department of notch moreover, is favorable to improving stop screw's atress condition.

A presser foot lifting device comprises the adjusting mechanism. In this scheme, adjustment mechanism can replace the transmission lever in the present presser foot device that lifts, not only can play the effect of transmission power in lifting the presser foot device, can adjust and revise the position of lifting the presser foot in the presser foot device moreover to be favorable to improving the sewing precision.

Further, the device also comprises a driving motor, a connecting rod, a vertically arranged pressure rod and a presser foot connected to the lower end of the pressure rod, wherein an output shaft of the driving motor is in transmission connection with the first transmission arm, one end of the connecting rod is in transmission connection with the second transmission arm, the other end of the connecting rod is in transmission connection with the pressure rod, and the driving motor is used for lifting or putting down the presser foot;

or, still include driving motor, connecting rod, the depression bar of vertical setting and connect in the presser foot of depression bar lower extreme, driving motor's output shaft transmission connects the one end of connecting rod, and the second transmission arm is connected in the other end transmission of connecting rod, and the depression bar is connected in the transmission of first transmission arm, and driving motor is used for raising or putting down the presser foot.

A sewing machine comprises the presser foot lifting device.

Compared with the prior art, the adjusting mechanism for the presser foot lifting device, the presser foot lifting device and the sewing machine provided by the utility model can not only replace the existing transmission lever to play a role in transmitting power in the presser foot lifting device, but also can effectively adjust the position of the presser foot in the presser foot lifting device so as to meet the requirement of high-precision sewing.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present utility model and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structural view of a conventional transmission lever.

Fig. 2 is a schematic structural diagram of a first driving arm in an adjusting mechanism according to embodiment 1 of the present utility model.

Fig. 3 is a schematic structural diagram of a second driving arm in the adjusting mechanism according to embodiment 1 of the present utility model.

Fig. 4 is a schematic structural diagram of an adjusting mechanism according to embodiment 1 of the present utility model.

Fig. 5 is a schematic partial structure of a presser foot lifting device according to embodiment 1 of the present utility model.

Fig. 6 is a front view of fig. 5.

Fig. 7 is a cross-sectional view at A-A in fig. 6.

Fig. 8 is a schematic structural diagram of an adjusting mechanism according to embodiment 2 of the present utility model.

Fig. 9 is a schematic structural view of a second driving arm in an adjusting mechanism according to embodiment 2 of the present utility model.

Fig. 10 is a schematic partial structure of a presser foot lifting device according to embodiment 2 of the present utility model.

Fig. 11 is a right side view of fig. 10.

Fig. 12 is a cross-sectional view at B-B in fig. 11.

Description of the drawings

The transmission arm 100, the first transmission arm 101, the second transmission arm 102, the first connection portion 103, the second connection portion 104, the hinge hole 105, the arc-shaped bar hole 106, and the through hole 107

Hinge structure 200, hinge 201, head 202, hinge post 203, limit groove 204, and bolt 205

Adjusting part 300

Bracket 400, assembly hole 401 and lock hole 402

Lugs 501, nuts 502, threaded holes 503, grooves 504, notch profiles 505, limit faces 506, limit screws 507, a first transmission 601 and a connecting rod 602.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. The components of the embodiments of the present utility model generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the utility model, as presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, which can be made by a person skilled in the art without making any inventive effort, are intended to be within the scope of the present utility model.

Example 1

In this embodiment, an adjusting mechanism for a presser foot lifting device is provided, which includes a first actuating arm 101, a second actuating arm 102, an adjusting member 300, and a bracket 400, wherein,

the first transmission arm 101 is configured with a first adjusting part and a first connecting part 103, while the second transmission arm 102 is configured with a second adjusting part and a second connecting part 104 which are adapted to the first adjusting part, wherein the arrangement of the first connecting part 103 and the second connecting part 104 is mainly convenient for the transmission connection of other transmission parts in the presser foot lifting device so as to facilitate the installation and assembly of the presser foot lifting device. In implementation, the first connection portion 103 and the second connection portion 104 have various embodiments, for example, the first connection portion 103 may preferably adopt a connection hole (including a unthreaded hole or a threaded hole 503) or a connection post, and of course, a connection groove, a hook, or the like may also be adopted; similarly, the second connection portion 104 may preferably be a connection hole or a connection post, or may be a connection groove, a hook, or the like. As shown in fig. 2 and 3, in the present embodiment, the first connection portion 103 and the first connection portion 103 are respectively connection holes, which facilitate both fixed connection with other transmission members and hinging (i.e., rotatable connection) with other transmission members.

In this embodiment, the first transmission arm 101 and the second transmission arm 102 are coaxially hinged to a bracket 400 through the hinge structure 200, that is, the first transmission arm 101 and the second transmission arm 102 are respectively rotatably constrained to the bracket 400, and the rotation centers of the first transmission arm 101 and the second transmission arm 102 coincide, as shown in fig. 4 and 5. The bracket 400 mainly serves to support and restrain the first and second actuator arms 101 and 102, and in practice, the bracket 400 may be a housing of a sewing machine or a frame provided in the housing of the sewing machine.

In order to coaxially hinge the first and second driving arms 101 and 102 to the bracket 400, the hinge structure 200 has various embodiments, for example, in one embodiment, the hinge structure 200 may include a hinge post 203 provided to the bracket 400, a nut 502, and hinge holes 105 respectively configured to the first and second driving arms 101 and 102 and adapted to the hinge post 203, the first and second driving arms 101 and 102 are respectively sleeved to the hinge post 203 through the hinge holes 105, the hinge post 203 is configured with external threads adapted to the nut 502, the nut 502 is screwed to the hinge post 203, and the first and second driving arms 101 and 102 are rotatably constrained to the hinge post 203, so that coaxial hinge of the first and second driving arms 101 and 102 may be achieved.

In another embodiment, the hinge structure 200 may include a hinge 201 and hinge holes 105 respectively formed on the first and second transmission arms 101 and 102 and adapted to the hinge 201, as shown in fig. 2 and 3, where the first and second transmission arms 101 and 102 are respectively sleeved on the hinge 201 through the hinge holes 105, and the hinge 201 is fixed to the bracket 400, so that coaxial hinge of the first and second transmission arms 101 and 102 can be achieved. In this case, the hinge 201 has various embodiments, for example, the hinge 201 may be a fastener configured with external threads such as a bolt or a screw, which is screwed to the screw hole 503 configured on the bracket 400, so as to rotatably constrain the first and second driving arms 101 and 102 by using the fastener such as the bolt or the screw, thereby achieving coaxial hinge of the first and second driving arms 101 and 102. As another example, in a preferred implementation manner provided in this embodiment, as shown in fig. 4 and 6, the hinge 201 includes a hinge post 203 and a head 202 disposed at one end of the hinge post 203, a limit groove 204 is formed on a side surface of the hinge post 203, meanwhile, a mounting hole 401 for adapting to the hinge post 203 and a lock hole 402 vertically communicating with the mounting hole 401 are formed on the bracket 400, an inner diameter of the mounting hole 401 is larger than an outer diameter of the hinge post 203, so that the hinge post 203 of the hinge 201 can be clamped into the mounting hole 401, as shown in fig. 6 and 7, meanwhile, the lock hole 402 is formed with an internal thread, the hinge post 203 of the hinge 201 can be inserted into a position corresponding to the lock hole 402 in the lock hole 402, a bolt 205 is screwed into the lock hole 402, and an end of the bolt 205 can be inserted into the corresponding limit groove 204, so that the hinge 201 can be locked to the mounting hole 401 by the bolt 205 inserted into the limit groove 204; at this time, the distance between the head 202 of the hinge 201 and the bracket 400 is greater than the sum of the thicknesses of the first and second transmission arms 101 and 102, so that the first and second transmission arms 101 and 102 can be rotatably constrained to the hinge 201, as shown in fig. 7, by adopting the hinge structure 200, the structure is simple, the processing is convenient, and the assembly is very convenient and firm.

In the present embodiment, the first adjusting portion and the first connecting portion 103 are respectively configured on both sides of the hinge structure 200 as shown in fig. 4, and similarly, the second adjusting portion and the second connecting portion 104 are respectively configured on both sides of the hinge structure 200 as shown in fig. 4. The second connecting portion 104 is configured at a position corresponding to the first connecting portion 103, and at the same time, the adjusting member 300 is configured to adapt to the first adjusting portion and the second adjusting portion, so that the locking and unlocking functions of the first actuating arm 101 and the second actuating arm 102 are realized through cooperation of the first adjusting portion, the second adjusting portion and the adjusting member 300, specifically, on one hand, the adjusting member 300 can lock the first actuating arm 101 and the second actuating arm 102, so that the first actuating arm 101 and the second actuating arm 102 can act synchronously as a whole, so as to play a role of transmitting power in the presser foot lifting device; on the other hand, the adjusting component 300 can unlock the first transmission arm 101 and the second transmission arm 102, so that the first transmission arm 101 and the second transmission arm 102 can rotate relatively, thereby conveniently adjusting the relative positions of the first transmission arm 101 and the second transmission arm 102, achieving the purpose of adjusting the relative positions of the first connecting part 103 and the second connecting part 104, and further realizing the adjustment and correction of the position of the presser foot. When the position of the presser foot is adjusted in place, the first transmission arm 101 and the second transmission arm 102 are locked by the adjusting component 300, which is very convenient.

The positions of the first connection part 103, the second connection part 104 and the adjusting member 300 may be determined according to actual needs, so that the structure is more reasonable, and in a preferred embodiment, the first connection part 103, the second connection part 104 and the adjusting member 300 may form a triangle structure, as shown in fig. 4 and 6, so as to change the transmission direction of the power, for example, the power transmitted from the first connection part 103 in the vertical direction may be converted into the power in the horizontal direction and transmitted through the second connection part 104.

In the present embodiment, the first transmission arm 101 is mainly used for transmission, and therefore, the shape of the first transmission arm 101 may not be limited, but in the present embodiment, the first transmission arm 101 adopts a sheet-like structure as shown in fig. 2 by way of example. Similarly, in the present embodiment, the second transmission arm 102 is also used for transmission, and therefore, the shape of the second transmission arm 102 may not be limited, but in the present embodiment, the second transmission arm 102 adopts a sheet-like structure as shown in fig. 3 by way of example. In order to make the first connecting portion 103, the second connecting portion 104 and the adjusting member 300 form a triangle structure, in a preferred embodiment, the first actuating arm 101 may be configured with a bend, as shown in fig. 2, the first connecting portion 103 and the first adjusting portion may be configured at two ends of the first actuating arm 101, respectively, while the second actuating arm 102 may be configured in a straight plate shape, as shown in fig. 3, the second connecting portion 104 and the second adjusting portion may be configured at two ends of the second actuating arm 102, respectively, and when the first actuating arm 101 and the second actuating arm 102 are coaxially hinged together, the first connecting portion 103 and the second connecting portion 104 are just in a mutually separated state, as shown in fig. 4 and 6, so that the first connecting portion 103, the second connecting portion 104 and the adjusting member 300 may form a triangle structure more naturally and reasonably.

The first adjusting portion, the second adjusting portion, and the adjusting member 300 have various embodiments, for example, the first adjusting portion may be a strip hole, and preferably an arc-shaped strip hole 106 may be adopted, and a center of a circle corresponding to the arc-shaped strip hole 106 coincides with a rotation center of the first driving arm 101, as shown in fig. 2; meanwhile, the second adjusting part may be a through hole 107 adapted to the arc-shaped bar hole 106, as shown in fig. 3, and at this time, the adjusting part 300 may be a bolt pair adapted to the through hole 107, as shown in fig. 4, so that the bolt in the bolt pair passes through the arc-shaped bar hole 106 and the through hole 107, and the first and second driving arms 101 and 102 may be locked/unlocked by nuts adapted to the bolt. On the contrary, in implementation, the first adjusting portion may be a through hole 107, the second adjusting portion may be a hole adapted to the through hole 107, and the arc-shaped hole 106 may be preferentially adopted, and at this time, the adjusting member 300 may be a bolt pair adapted to the through hole 107, so that the same effect can be achieved. Of course, the first adjusting portion and the second adjusting portion may be mutually adapted strip holes, respectively, and the adjusting member 300 is a bolt pair adapted to the strip holes. As another example, the first adjusting portion may be a threaded post, and the second adjusting portion may be an arc-shaped bar hole 106 adapted to the threaded post, where the adjusting member 300 may be a nut 502 adapted to the threaded post, so that not only the relative positions of the first transmission arm 101 and the second transmission arm 102 may be adjusted, but also the first transmission arm 101 and the second transmission arm 102 may be locked/unlocked by using the nut 502. For example, the second adjusting portion may be a threaded column, the first adjusting portion may be an arc-shaped bar hole 106 adapted to the threaded column, and at this time, the adjusting member 300 may be a nut 502 adapted to the threaded column, so that not only the relative positions of the first transmission arm 101 and the second transmission arm 102 may be adjusted, but also the first transmission arm 101 and the second transmission arm 102 may be locked/unlocked by using the nut 502, and the same effect may be achieved.

The adjusting mechanism provided by the embodiment can replace a transmission lever in the existing presser foot lifting device, can play a role in transmitting power in the presser foot lifting device, can adjust and correct the position of the presser foot in the presser foot lifting device, and is beneficial to accurately executing preset presser foot lifting/releasing actions of a sewing machine and high-precision sewing work.

Example 2

In order to solve the problem of further improving the accuracy of the presser foot, the main difference between the present embodiment 2 and the above embodiment 1 is that the adjusting mechanism provided in this embodiment further includes a limiting structure, where the limiting structure includes a first limiting portion disposed on the first transmission arm 101 or the second transmission arm 102, and a second limiting portion configured on the bracket 400 and adapted to the first limiting portion, and the second limiting portion is configured on the motion path of the first limiting portion, and is used for blocking the first limiting portion, so that the first limiting portion and the second limiting portion can form a limiting fit, such as when the first transmission arm 101 and the second transmission arm 102 jointly rotate to a preset position, the first limiting portion just abuts against the second limiting portion, so that the limiting effect can be played on the motion process of the first transmission arm 101 and the second transmission arm 102, not only can accurately control the lowest position of the presser foot, the initial pressure of the presser foot, and the problem of excessive motion caused by inertia and other factors can be prevented, and the accuracy of the motion of the presser foot is improved.

The limiting structure has various embodiments, for example, the first limiting portion and the second limiting portion may be respectively configured as a stopper, a baffle, a lever, or the like that are mutually adapted, so that the two may achieve limiting fit.

In actual products, due to differences in manufacturing, assembly and wear conditions, it is difficult for the conventional limiting structure to meet the high-precision limiting requirement, so in a preferred embodiment, the first limiting portion includes a limiting screw 507 and a lug 501 connected to the first transmission arm 101 or the second transmission arm 102, as shown in fig. 8 and 9, the lug 501 is configured with a threaded hole 503 adapted to the limiting screw 507, the limiting screw 507 is in threaded connection with the threaded hole 503, and the end of the limiting screw 507 forms a limiting fit with the second limiting portion. Specifically, the second limiting portion may be a stopper, a baffle, a lever, or the like configured on the bracket 400, and the threaded hole 503 may be directly formed on the lug 501, but since the lug 501 may have a sheet structure, it is inconvenient to form the threaded hole 503, and thus in a preferred embodiment, the nut 502 further includes a nut 502 adapted to the limiting screw 507, and the nut 502 is configured with the threaded hole 503, as shown in fig. 10, at this time, the lug 501 is formed with a hole, the nut 502 is connected to one side of the lug 501, and the threaded hole 503 of the nut 502 corresponds to the hole, as shown in fig. 10, so that not only the limiting screw 507 can be restrained and adjusted, but also the threaded hole 503 can be formed on the lug 501 rapidly. During assembly, the limit screw 507 is in threaded connection with the threaded hole 503 of the support lug 501, and the distance between the end part of the limit screw 507 and the second limit part is adjustable, so that the limit position can be adjusted according to actual requirements, the position adjustment requirement of the presser foot can be met, the universality of the adjusting mechanism is improved, the limit requirement of higher precision can be met, and the position precision of the presser foot is improved.

In a further scheme, the second limiting part is further provided with a groove 504 which is matched with the limiting screw 507, and the end part of the limiting screw 507 corresponds to the notch contour 505 of the groove 504, as shown in fig. 11 and 12; in practice, the size of the groove 504 may be larger than the outer diameter of the shank in the stop screw 507 so as not to interfere with the stop fit of the stop screw 507 with the notch profile 505. The shape of the groove 504 may be preferably configured to be adapted to the limit screw 507, as shown in fig. 12, the groove 504 may preferably be a round hole, and the outer diameter of the screw in the limit screw 507 is smaller than the inner diameter of the groove 504, so that the end of the limit screw 507 may abut against the contour of the notch, thereby achieving the purpose of limiting. By means of the design, the end part of the limit screw 507 and the second limit part can be matched, and the stress condition of the limit screw 507 can be improved.

In a more complete solution, the second limiting portion is further configured with a limiting surface 506 facing the limiting screw 507, and the groove 504 is configured in the limiting surface 506, where the notch profile 505 is an edge angle formed between the notch and the limiting surface 506, as shown in fig. 12.

Example 3

The embodiment provides a lift presser foot device, including above-mentioned adjustment mechanism, when implementing, adjustment mechanism can replace the transmission lever in the present lift presser foot device, not only can play the effect of transmission power in lifting the presser foot device, can adjust and revise the position of lifting the presser foot in the presser foot device moreover to satisfy the needs of high accuracy sewing.

In one embodiment, the adjusting mechanism may be disposed between the driving motor and the link 602, for example, the presser foot lifting device further includes a driving motor, a link 602, a vertically disposed pressing bar, and a presser foot connected to a lower end of the pressing bar, as shown in fig. 6 and 10, wherein,

the output shaft of the driving motor may be in driving connection with the first connection portion 103 of the first driving arm 101 through the first driving mechanism 601, as shown in fig. 6 and 10, in implementation, the first driving mechanism 601 may be one or more of the existing driving components (such as a driving rod, a driving plate, a driving rope, etc.), a cam mechanism, a gear mechanism, a link 602 mechanism, etc., and at the same time, the first driving mechanism 601 may be hinged to the first connection portion 103 for smoother driving.

One end of the connecting rod 602 is in driving connection with the second connecting part 104 of the second driving arm 102, and in implementation, one end of the connecting rod 602 may be directly hinged to the second connecting part 104 of the second driving arm 102, as shown in fig. 6 and 10; in addition, one end of the connecting rod 602 may also implement a transmission connection between the connecting rod 602 and the second transmission arm 102 through an existing transmission component or transmission mechanism, and may be hinged, as shown in fig. 10, so as to enable smoother transmission; meanwhile, the other end of the connecting rod 602 is in transmission connection with the pressing rod, and in implementation, the connecting rod 602 can be in transmission connection with the pressing rod through an existing third transmission mechanism so as to drive the pressing rod to lift/lower along the vertical direction, so that the driving motor can be in transmission connection with the presser foot so as to be used for lifting or lowering the presser foot.

In practice, the linkage 602 is generally disposed horizontally or at an angle oblique to the horizontal, as shown in fig. 6 and 10.

Of course, it should be understood that, in some embodiments, the adjusting mechanism may be installed in the presser foot lifting device in a direction, for example, the output shaft of the driving motor may be connected to the second driving arm 102 through the first driving mechanism 601 in a driving manner, and the connecting rod 602 may be connected to the first driving arm 101 in a driving manner, which will not be described herein.

Similarly, in another embodiment, the adjusting mechanism may be disposed between the connecting rod 602 and the pressing rod, for example, the presser foot lifting device further includes a driving motor, the connecting rod 602, a vertically disposed pressing rod, and a presser foot connected to the lower end of the pressing rod, where an output shaft of the driving motor may be connected with one end of the connecting rod 602 through the transmission of the first transmission mechanism 601, and the other end of the connecting rod 602 may be connected with the second connection portion 104 of the second transmission arm 102 through the transmission of the second connection portion 103 of the first transmission arm 101, so that the driving motor may also be used to lift or lower the presser foot.

Of course, it will be appreciated that in other embodiments, the presser foot lifting device may include two sets of adjusting mechanisms, one set of adjusting mechanism is disposed between the driving motor and the connecting rod 602, and the other set of adjusting mechanism is disposed between the connecting rod 602 and the pressing rod, so that two adjusting mechanisms in the presser foot lifting device may be used to adjust or correct the position of the presser foot, which is more beneficial to improving sewing precision.

Example 4

This embodiment provides a sewing machine comprising the presser foot lifting device described in embodiment 3. In practice, the bracket 400 may be a housing of the sewing machine, as shown in fig. 5 and 10, or may be a stand provided in the sewing machine housing.

The foregoing is merely illustrative of the present utility model, and the present utility model is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present utility model.

Claims (10)

1. An adjusting mechanism for a presser foot lifting device comprises a first driving arm and a second driving arm, wherein the first driving arm and the second driving arm are respectively provided with a first connecting part and a second connecting part, and the adjusting mechanism is characterized in that the first driving arm is also provided with a first adjusting part, the second driving arm is also provided with a second adjusting part which is matched with the first adjusting part,

also comprises an adjusting component which is matched with the first adjusting part and the second adjusting part,

the first transmission arm and the second transmission arm are coaxially hinged to a bracket through a hinge structure, so that the first connecting part, the second connecting part and the adjusting part form a triangle structure,

the adjusting component is used for locking the first transmission arm and the second transmission arm so as to enable the first transmission arm and the second transmission arm to synchronously act, and is used for unlocking the first transmission arm and the second transmission arm so as to adjust the relative positions of the first transmission arm and the second transmission arm.

2. The adjusting mechanism for a presser foot lifting device according to claim 1, wherein the first adjusting portion is a bar hole, the second adjusting portion is a through hole for fitting the bar hole, and the adjusting member is a bolt pair for fitting the through hole;

or the first adjusting part is a through hole, the second adjusting part is a strip hole matched with the through hole, the adjusting part is a bolt pair matched with the through hole,

or, the first adjusting part and the second adjusting part are respectively strip holes which are mutually matched, and the adjusting part is a bolt pair which is matched with the strip holes.

3. The adjusting mechanism for the presser foot lifting device according to claim 2, wherein the strip hole is an arc-shaped strip hole, and a circle center corresponding to the arc-shaped strip hole coincides with a rotation center of the first transmission arm;

and/or, the first connecting part is a connecting hole or a connecting column;

and/or, the second connecting part is a connecting hole or a connecting column;

and/or the first connecting part and the second connecting part are respectively configured at one ends of the first transmission arm and the second transmission arm, and the first adjusting part and the second adjusting part are respectively configured at the other ends of the first transmission arm and the second transmission arm.

4. An adjustment mechanism for a presser foot lifting device as claimed in any one of claims 1 to 3 wherein the hinge structure comprises a hinge member and hinge holes respectively formed in the first and second transmission arms and adapted to the hinge member, the first and second transmission arms respectively being fitted over the hinge member through the hinge holes, the hinge member being fixed to the bracket;

or, the hinge structure comprises a hinge post arranged on the bracket, a nut and hinge holes respectively formed in the first transmission arm and the second transmission arm and adapted to the hinge post, the first transmission arm and the second transmission arm are respectively sleeved on the hinge post through the hinge holes, the hinge post is provided with external threads adapted to the nut, the nut is in threaded connection with the hinge post, and the first transmission arm and the second transmission arm are rotationally restrained on the hinge post.

5. The adjusting mechanism for a presser foot lifting device as recited in claim 4, wherein the hinge member includes a hinge post and a head portion provided at one end of the hinge post, a limit groove is formed in a side surface of the hinge post, the bracket is configured with an assembly hole adapted to the hinge post and a lock hole vertically communicating with the assembly hole, the lock hole is configured with an internal thread, and the hinge member is locked to the assembly hole by a bolt inserted into the limit groove.

6. The adjusting mechanism for a presser foot lifting device as recited in any one of claims 1-3, further comprising a limiting structure, wherein the limiting structure comprises a first limiting portion disposed on the first or second driving arm, and a second limiting portion configured on the bracket and adapted to the first limiting portion, and the second limiting portion is configured on an action path of the first limiting portion, for blocking the first limiting portion, such that the first limiting portion and the second limiting portion form a limiting fit.

7. The adjustment mechanism for a presser foot lifting device as set forth in claim 6 wherein said first stop portion includes a stop screw and a lug connected to either the first or second drive arm, said lug being configured with a threaded bore adapted for receiving the stop screw, the stop screw being threadably received in the threaded bore, the end of the stop screw forming a stop fit with the second stop portion.

8. A presser foot lifting device comprising an adjustment mechanism as claimed in any one of claims 1 to 7.

9. The presser foot lifting device according to claim 8, further comprising a driving motor, a connecting rod, a vertically arranged pressing rod and a presser foot connected to the lower end of the pressing rod, wherein an output shaft of the driving motor is in transmission connection with the first transmission arm, one end of the connecting rod is in transmission connection with the second transmission arm, the other end of the connecting rod is in transmission connection with the pressing rod, and the driving motor is used for lifting or lowering the presser foot;

or, still include driving motor, connecting rod, the depression bar of vertical setting and connect in the presser foot of depression bar lower extreme, driving motor's output shaft transmission connects the one end of connecting rod, and the second transmission arm is connected in the other end transmission of connecting rod, and the depression bar is connected in the transmission of first transmission arm, and driving motor is used for raising or putting down the presser foot.

10. A sewing machine comprising a presser foot lifting device as claimed in any one of claims 8 to 9.