CN111434821A

CN111434821A - Sewing machine

Info

Publication number: CN111434821A
Application number: CN201910033520.5A
Authority: CN
Inventors: 林燕平; 鲍增金; 楼俏军; 黄玉敏; 赵越; 黄贤木
Original assignee: Zhejiang Zoje Sewing Machine Co Ltd
Current assignee: Zhejiang Zoje Sewing Machine Co Ltd
Priority date: 2019-01-14
Filing date: 2019-01-14
Publication date: 2020-07-21

Abstract

The invention provides a sewing machine, comprising: a housing; the outer presser foot is movably arranged along the vertical direction; the inner presser foot is movably arranged along the vertical direction; the connecting assembly is connected with the outer presser foot and the inner presser foot and comprises a swinging piece; the driving structure is in driving connection with the swinging piece; the driving structure drives the swinging piece to swing, so that the inner presser foot and the outer presser foot move towards opposite directions under the driving of the connecting assembly; the limiting connecting rod is pivotally arranged in the machine shell and is connected with the driving structure and used for limiting the swinging piece to swing within a preset angle; the rotation center of the limiting connecting rod can be adjusted, so that the size of a preset angle can be adjusted by adjusting the position of the rotation center of the limiting connecting rod, and the alternating quantity between the inner presser foot and the outer presser foot can be adjusted. The invention solves the problem that the sewing machine in the prior art cannot adjust the alternating quantity of the inner presser foot and the outer presser foot.

Description

Sewing machine

Technical Field

The invention relates to the technical field of sewing machine manufacturing, in particular to a sewing machine.

Background

In a sewing machine which does not use a feeding tooth to drive the cloth to move, in order to prevent the friction between the cloth and the needle, which causes the cloth to rise together with the needle and generates needle skipping, an inner presser foot is usually arranged in an outer presser foot. When the sewing machine works normally, the inner presser foot and the outer presser foot alternately press the sewed object on the needle plate.

In the prior art, the alternating quantity between the inner presser foot and the outer presser foot of the sewing machine cannot be adjusted, and when materials have thickness difference at different positions, the fabric is too thick or the fabric climbs, if the alternating quantity of the inner presser foot and the outer presser foot is not increased, the sewing cannot be normally carried out.

Disclosure of Invention

The invention mainly aims to provide a sewing machine, which solves the problem that the sewing machine in the prior art cannot adjust the alternating quantity of inner and outer presser feet.

In order to achieve the above object, the present invention provides a sewing machine comprising: a housing; the outer presser foot is movably arranged along the vertical direction; the inner presser foot is movably arranged along the vertical direction; the connecting assembly is connected with the outer presser foot and the inner presser foot and comprises a swinging piece; the driving structure is in driving connection with the swinging piece; the driving structure drives the swinging piece to swing, so that the inner presser foot and the outer presser foot move towards opposite directions under the driving of the connecting assembly; the limiting connecting rod is pivotally arranged in the machine shell and is connected with the driving structure and used for limiting the swinging piece to swing within a preset angle; the rotation center of the limiting connecting rod can be adjusted, so that the size of a preset angle can be adjusted by adjusting the position of the rotation center of the limiting connecting rod, and the alternating quantity between the inner presser foot and the outer presser foot can be adjusted.

Further, the connection assembly further comprises: the first end of the first connecting rod is hinged with the swinging piece; the mounting block is provided with three connecting ends arranged around the circumference of the mounting block, one connecting end of the mounting block is hinged with the second end of the first connecting rod, and the other connecting end of the mounting block is hinged with the top of the outer presser foot; and the first end of the second connecting rod is hinged with the other connecting end of the mounting block, and the second end of the second connecting rod is hinged with the top of the inner presser foot.

Further, the sewing machine further includes: the adjusting motor is fixedly arranged in the shell; the output shaft of the adjusting motor is in driving connection with the first end of the adjusting block, and the limiting connecting rod is hinged with the second end of the adjusting block; wherein, the output shaft through control adjusting motor rotates, drives the regulating block and rotates around the first end of regulating block to change the position of the second end of regulating block, thereby change the position of the rotation center of spacing connecting rod.

Further, the driving structure includes: the rotating shaft is pivotally arranged in the shell; the eccentric wheel is sleeved on the rotating shaft and is fixedly connected with the rotating shaft; the connecting piece is in contact fit with the eccentric wheel; the first end of the transmission connecting rod is hinged with the connecting piece, the second end of the transmission connecting rod is hinged with the swinging piece, and the limiting connecting rod is hinged with the connecting piece; the connecting piece moves under the pushing action of the eccentric wheel, the transmission connecting rod moves along with the eccentric wheel and drives the swinging piece to swing, and the swinging piece swings within a preset angle under the limiting action of the limiting connecting rod.

Furthermore, the connecting piece comprises a connecting ring, the connecting ring is sleeved on the eccentric wheel, the first end of the transmission connecting rod is hinged to the outer peripheral wall of the connecting ring, and the limiting connecting rod is hinged to the outer peripheral wall of the connecting ring.

Furthermore, the driving structure further comprises a bearing, and the connecting ring is sleeved on the eccentric wheel through the bearing.

Furthermore, the connecting piece still includes the connection arch of being connected with the periphery wall of go-between, and the first end of transmission connecting rod is articulated with the connection arch, and spacing connecting rod is articulated with the connection arch.

Furthermore, the adjusting block is provided with a mounting groove, the connecting bulge extends into the mounting groove, and the transmission connecting rod and the limiting connecting rod are both positioned in the mounting groove and hinged with the connecting bulge through a connecting pin; the mounting groove is provided with two groove walls arranged along the axial direction of the output shaft, and the connecting bulge, the transmission connecting rod and the limiting connecting rod are clamped between the two groove walls to limit the connecting bulge, the transmission connecting rod and the limiting connecting rod from moving along the axial direction of the output shaft.

Furthermore, the number of the transmission connecting rods is two, the connecting bulge is located between the two transmission connecting rods, the number of the limiting connecting rods is two, and the two transmission connecting rods are located between the two limiting connecting rods.

Furthermore, a mounting hole is formed in the adjusting block, the adjusting block is sleeved on the output shaft through the mounting hole, a first fixing hole which extends along the radial direction of the output shaft and is communicated with the mounting hole is formed in the adjusting block, and a second fixing hole which extends along the radial direction of the output shaft is formed in the output shaft; the sewing machine further includes: the fixing piece passes first fixed orifices and second fixed orifices in proper order in order to be connected regulating block and output shaft fixed connection.

Further, the sewing machine further includes: the connecting shaft is fixedly connected with the swinging piece; the connecting sleeve comprises a connecting sleeve body and a protruding portion which are connected, an assembling hole is formed in the connecting sleeve body, the connecting sleeve body is sleeved on the connecting shaft through the assembling hole, and the second end of the transmission connecting rod is hinged to the protruding portion.

According to the technical scheme, the connecting assembly connected with the inner presser foot and the outer presser foot and the driving structure in driving connection with the connecting assembly are arranged, wherein the connecting assembly comprises a swinging piece, and the driving structure is in driving connection with the swinging piece. The swinging piece is driven to swing through the control driving structure, so that the inner presser foot and the outer presser foot move towards opposite directions under the driving of the connecting component. Wherein the angle of oscillation of the oscillating member determines the amount of alternation between the inner and outer presser feet. But this application has set up the spacing connecting rod of the pivot setting connected with drive structure, and spacing connecting rod is used for restricting the swinging member and swings in predetermined angle, and wherein, the rotation center of spacing connecting rod is adjustable, and when the rotation center of spacing connecting rod changed, the swing angle of swinging member can change thereupon, and then can change the alternating quantity between interior presser foot and the external pressure foot. The application provides a sewing machine has solved the problem of the inside and outside presser foot volume of alternating of sewing machine among the prior art can't adjust, when the material that is made up goes out the condition that school thickness increases or surface fabric climbing, can increase the volume of alternating between the inside and outside presser foot through the position of the center of rotation of adjusting spacing connecting rod, guarantees to make and goes on smoothly.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:

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

FIG. 2 shows an enlarged schematic view at A in FIG. 1;

FIG. 3 shows a disassembled schematic view of the sewing machine of FIG. 1;

fig. 4 shows a schematic structural view of an adjusting shaft, a connecting piece, a transmission link, a limiting link and a connecting sleeve of the sewing machine of fig. 1.

Wherein the figures include the following reference numerals:

10. an outer presser foot; 11. an external pressure foot connecting rod; 20. an inner presser foot; 21. a pressing foot connecting rod; 22. a guide projection; 31. a swinging member; 32. a first link; 33. mounting blocks; 34. a second link; 40. a drive structure; 41. a rotating shaft; 42. an eccentric wheel; 43. a connecting member; 44. a transmission connecting rod; 50. a limiting connecting rod; 60. adjusting the motor; 61. an output shaft; 70. an adjusting block; 71. mounting holes; 72. mounting grooves; 80. a connecting shaft; 90. connecting sleeves; 91. an assembly hole; 100. a motor bracket; 110. a bearing; 120. a fixing member; 150. a guide sleeve; 160. a guide block; 161. a guide groove; 170. a slider; 171. mounting holes; 180. an adjustment shaft; 190. a coupling is provided.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The invention provides a sewing machine, aiming at solving the problem that the sewing machine in the prior art cannot adjust the alternating quantity of inner and outer presser feet.

As shown in fig. 1 to 4, the sewing machine includes a machine shell, an outer presser foot 10, an inner presser foot 20, a connecting assembly, a driving structure 40 and a limiting connecting rod 50, wherein the outer presser foot 10 is movably arranged along a vertical direction, the inner presser foot 20 is movably arranged along the vertical direction, the connecting assembly is connected with both the outer presser foot 10 and the inner presser foot 20, the connecting assembly includes a swinging member 31, and the driving structure 40 is in driving connection with the swinging member 31; the driving structure 40 drives the oscillating piece 31 to oscillate, so that the inner presser foot 20 and the outer presser foot 10 move in opposite directions under the driving of the connecting assembly, the limiting link 50 is pivotally arranged in the machine shell, the limiting link 50 is connected with the driving structure 40 and is used for limiting the oscillating piece 31 to oscillate within a preset angle, wherein the rotation center of the limiting link 50 can be adjusted, so that the size of the preset angle can be adjusted by adjusting the position of the rotation center of the limiting link 50, and the alternating quantity between the inner presser foot 20 and the outer presser foot 10 can be adjusted.

In the present application, a connecting assembly connected to both the inner presser foot 20 and the outer presser foot 10 is provided, and a driving structure 40 in driving connection with the connecting assembly, wherein the connecting assembly comprises an oscillating member 31, and the driving structure 40 is in driving connection with the oscillating member 31. The swinging piece 31 is driven to swing through the control driving structure 40, so that the inner presser foot 20 and the outer presser foot 10 move in opposite directions under the driving of the connecting assembly. Wherein the angle of oscillation of the oscillating member 31 determines the amount of alternation between the inner presser foot 20 and the outer presser foot 10. The present application provides a pivotally disposed limiting link 50 connected to the driving structure 40, the limiting link 50 is used to limit the swinging of the swinging member 31 within a predetermined angle, wherein the rotation center of the limiting link 50 is adjustable, and when the rotation center of the limiting link 50 is changed, the swinging angle of the swinging member 31 will be changed accordingly, so as to change the alternating amount between the inner presser foot 20 and the outer presser foot 10. The application provides a sewing machine has solved the problem of the inside and outside presser foot volume of alternating of sewing machine among the prior art can't adjust, when the material that is made up goes out the condition that school thickness increases or surface fabric climbing, can increase the volume of alternating between the inside and outside presser foot through the position of adjusting limiting connecting rod 50's rotation center, guarantees to make and goes on smoothly.

When the sewing machine is in normal operation, the outer presser foot 10 and the inner presser foot 20 have fixed lifting positions and falling positions, and normally the lifting positions and the falling positions of the outer presser foot 10 and the inner presser foot 20 are the same, when the outer presser foot 10 is in the falling position, the inner presser foot 20 is in the lifting position, and when the outer presser foot 10 is in the lifting position, the inner presser foot 20 is in the falling position. Thus, the outer presser foot 10 and the inner presser foot 20 are alternately lifted and lowered to complete the feeding action of the sewed material in cooperation with the feeding teeth and other mechanisms. And the alternating amount of the inner presser foot and the outer presser foot is the height difference between the lifting position and the falling position.

As shown in fig. 3, the connection assembly further includes a first link 32, a mounting block 33, and a second link 34, a first end of the first link 32 is hinged to the swinging member 31, the mounting block 33 has three connecting ends disposed around a circumference thereof, one connecting end of the mounting block 33 is hinged to a second end of the first link 32, the other connecting end of the mounting block 33 is hinged to a top of the external pressure foot 10, a first end of the second link 34 is hinged to the other connecting end of the mounting block 33, and a second end of the second link 34 is hinged to a top of the internal pressure foot 20.

Taking fig. 3 as an example, when the swinging member 31 rotates clockwise, the swinging member 31 drives the first link 32 to move leftward, the mounting block 33 moves leftward under the pulling of the first link 32, and also rotates counterclockwise, the mounting block 33 drives the inner press foot 20 connected thereto to ascend, and the outer press foot 10 descends; when the swinging member 31 rotates counterclockwise, the swinging member 31 drives the first link 32 to move rightward, the mounting block 33 moves rightward under the pulling of the first link 32, and simultaneously, the mounting block 33 drives the inner press foot 20 connected with the mounting block to descend, and the outer press foot 10 ascends. Alternatively, the swinging member 31 rotates clockwise by the same angle as that of the counterclockwise rotation.

Alternatively, the mounting block 33 is arranged in a triangle, and the three connecting ends are respectively located at three corners of the mounting block 33 arranged in a triangle.

Alternatively, the sewing machine has a guide groove 161 extending in the vertical direction; the inner presser foot 20 comprises an inner presser foot connecting rod 21 and a guide protrusion 22, the second end of the second connecting rod 34 is hinged with the top of the inner presser foot connecting rod 21, the guide protrusion 22 is fixedly connected with the inner presser foot connecting rod 21, and at least part of the guide protrusion 22 extends into the guide groove 161. Thus, the guide projection 22 slides in the guide groove 161, and the inner presser link 21 is guided by the guide groove 161, thereby ensuring the vertical movement of the inner presser link 21.

Alternatively, the guide boss 22 and the inner presser foot link 21 are integrally formed.

The mounting block 33 is directly connected with the outer presser foot link 11, the mounting block 33 is connected with the inner presser foot link 21 through the second link 34, and at the same time, the outer presser foot link 11 and the inner presser foot link 21 are ensured to smoothly move alternately in the vertical direction under the guiding action of the guide groove 161 and the guide sleeve 150.

As shown in fig. 1 and 2, the sewing machine further includes a guide block 160 disposed in the housing, and the guide block 160 is provided with a guide groove 161 extending in a vertical direction. In order to simplify the processing of the machine shell, the position of the guide protrusion 22 is flexibly arranged, an additional guide block 160 is arranged, a guide groove 161 matched with the guide protrusion 22 is formed in the guide block 160, and the guide block 160 can be replaced after the groove wall of the guide groove 161 is worn, so that the maintenance of the sewing machine is facilitated, and the maintenance cost of the sewing machine is reduced.

In an alternative embodiment of the present application, which is not shown in the drawings, a guide groove 161 extending in a vertical direction is formed on an inner wall of the housing. Therefore, the parts of the sewing machine can be reduced, the assembly process of the sewing machine is simplified, and the assembly efficiency of the sewing machine is improved.

As shown in fig. 1 and 2, the sewing machine further includes a slider 170, the slider 170 being movably disposed in the guide groove 161; the slider 170 has a mounting hole 171, and the guide projection 22 protrudes into the mounting hole 171. Thus, the guide protrusion 22 drives the sliding block 170 to slide in the guide groove 161, the guide protrusion 22 does not need to be matched with the guide groove 161, the requirement on the processing precision of the guide protrusion 22 can be reduced, the processing requirement on the inner presser foot 20 is reduced, the inner presser foot 20 is prevented from being integrally replaced after the guide protrusion 22 is abraded, and the maintenance of the sewing machine is facilitated.

In an alternative embodiment of the present application, not shown, the mounting block 33 is directly connected to the inner presser foot link 21, the mounting block 33 is connected to the outer presser foot link 11 through a second link, the inner presser foot link 21 is guided by a guide sleeve, and the outer presser foot link 11 is guided by a guide projection and a guide groove in cooperation.

As shown in fig. 1 and 3, the sewing machine further comprises an adjusting motor 60 and an adjusting block 70, the adjusting motor 60 is fixedly arranged in the machine shell, an output shaft 61 of the adjusting motor 60 is in driving connection with a first end of the adjusting block 70, and the limiting connecting rod 50 is hinged with a second end of the adjusting block 70; wherein, the output shaft 61 of the adjusting motor 60 is controlled to rotate, so as to drive the adjusting block 70 to rotate around the first end of the adjusting block 70, so as to change the position of the second end of the adjusting block 70, thereby changing the position of the rotation center of the limiting connecting rod 50. In this way, the position of the rotation center of the stopper link 50 is adjusted by the adjustment motor 60, thereby changing the amount of alternation between the inner and outer presser feet.

Alternatively, the adjustment motor 60 is fixedly connected to the top of the housing through the motor bracket 100. As shown in fig. 1, a fixing hole for fixedly connecting with the housing is formed in the motor bracket 100, the motor bracket 100 is fixed to the housing by a fixing member such as a bolt, and the adjustment motor 60 is fixed to the motor bracket 100.

As shown in fig. 1 to 4, the driving structure 40 includes a rotating shaft 41, an eccentric wheel 42, a connecting member 43 and a transmission connecting rod 44, the rotating shaft 41 is pivotally disposed in the housing, the eccentric wheel 42 is sleeved on the rotating shaft 41 and is fixedly connected with the rotating shaft 41, the connecting member 43 is in contact fit with the eccentric wheel 42, a first end of the transmission connecting rod 44 is hinged to the connecting member 43, a second end of the transmission connecting rod 44 is hinged to the swinging member 31, and the limiting connecting rod 50 is hinged to the connecting member 43; wherein, the rotating shaft 41 drives the eccentric wheel 42 to rotate synchronously with the axis of the rotating shaft 41 as the rotation center, the connecting piece 43 moves under the pushing action of the eccentric wheel 42, the transmission connecting rod 44 moves along with the eccentric wheel 42 and drives the swinging piece 31 to swing, and the swinging piece 31 swings within a preset angle under the limiting action of the limiting connecting rod 50. When the position of the rotation center of the limit link 50 is changed, the angle of the swing member 31 is changed, and the alternating amount between the inner and outer presser feet is changed.

As shown in fig. 1 and 3, the connecting member 43 includes a connecting ring, the connecting ring is sleeved on the eccentric wheel 42, the first end of the transmission connecting rod 44 is hinged to the outer peripheral wall of the connecting ring, and the limiting connecting rod 50 is hinged to the outer peripheral wall of the connecting ring. Therefore, the connecting ring is sleeved on the eccentric wheel 42, and the connection stability between the connecting piece 43 and the eccentric wheel 42 can be improved.

As shown in fig. 3, the driving structure 40 further includes a bearing 110, and the connecting ring is sleeved on the eccentric wheel 42 through the bearing 110. Thus, the friction force between the connecting ring and the eccentric 42 can be reduced, and the connecting ring and the eccentric 42 are prevented from being worn.

Optionally, the connecting member 43 further comprises a connecting protrusion connected to the outer circumferential wall of the connecting ring, the first end of the transmission link 44 is hinged to the connecting protrusion, and the limiting link 50 is hinged to the connecting protrusion. In order to facilitate the connection between the connection ring and the transmission connecting rod 44, a connection protrusion is provided, optionally, a connection through hole is provided on the connection protrusion, a connection pin is inserted in the connection through hole, and the transmission connecting rod 44 and the limiting connecting rod 50 are both hinged to the connection ring through the connection pin.

As shown in fig. 1 and 2, the adjusting block 70 is provided with an installation groove 72, the connecting protrusion extends into the installation groove 72, and the transmission link 44 and the limiting link 50 are both located in the installation groove 72 and hinged to the connecting protrusion through a connecting pin; the mounting groove 72 has two groove walls arranged along the axial direction of the output shaft 61, and the connecting protrusion, the transmission connecting rod 44 and the limiting connecting rod 50 are clamped between the two groove walls to limit the movement of the connecting protrusion, the transmission connecting rod 44 and the limiting connecting rod 50 along the axial direction of the output shaft 61, so as to improve the motion stability of each component.

As shown in fig. 4, there are two transmission links 44, two connection protrusions are located between the two transmission links 44, two limit links 50 are located, and two transmission links 44 are located between the two limit links 50. In order to ensure the transmission stability between the parts, two transmission connecting rods 44 and two limiting connecting rods 50 are arranged.

As shown in fig. 1 and fig. 2, a mounting hole 71 is formed in the adjusting block 70, the adjusting block 70 is sleeved on the output shaft 61 through the mounting hole 71, a first fixing hole extending along the radial direction of the output shaft 61 and communicating with the mounting hole 71 is formed in the adjusting block 70, and a second fixing hole extending along the radial direction of the output shaft 61 is formed in the output shaft 61; the sewing machine further includes a fixing member 120, and the fixing member 120 sequentially passes through the first fixing hole and the second fixing hole to fixedly connect the adjusting block 70 with the output shaft 61.

Optionally, as shown in fig. 1, the output shaft 61 and the adjusting block 70 are connected through an adjusting shaft 180 and a coupling 190, wherein the adjusting shaft 180 is inserted into the mounting hole 71, and the adjusting shaft 180 and the output shaft 61 are connected through the coupling 190, because the length of the output shaft 61 of the adjusting motor 60 is limited, in order to flexibly set the position of the adjusting motor 60 and avoid interference between various parts, the adjusting shaft 180 and the coupling 190 are added.

As shown in fig. 1, 2 and 4, the sewing machine further includes a connecting shaft 80 and a connecting sleeve 90, the connecting shaft 80 is fixedly connected with the swinging member 31, the connecting sleeve 90 includes a connecting sleeve body and a protruding portion connected with each other, an assembling hole 91 is formed in the connecting sleeve body, the connecting sleeve body is sleeved on the connecting shaft 80 through the assembling hole 91, and the second end of the transmission connecting rod 44 is hinged to the protruding portion.

As shown in fig. 1, when the sewing machine normally works, the rotating shaft 41 rotates clockwise and drives the eccentric wheel 42 to rotate, the connecting ring moves under the pushing action of the eccentric wheel 42, and simultaneously the connecting ring rotates relative to the eccentric wheel 42 under the pulling action of the limiting connecting rod 50, the connecting ring rotates to drive the connecting sleeve 90 to swing through the transmission connecting rod 44, the connecting sleeve 90 drives the swinging piece 31 to swing through the connecting shaft 80, and the limit angle of the swinging of the connecting ring can be limited because the rotating center of the limiting connecting rod 50 is unchanged, so that the swinging angle of the swinging piece 31 is limited, and the value of the inner and outer presser foot alternating quantity is further limited. When the inner presser foot alternating quantity and the outer presser foot alternating quantity need to be changed, the adjusting motor 60 drives the adjusting block 70 to rotate and drives the limiting connecting rod 50 to rotate, the rotating center of the limiting connecting rod 50 is changed, and after the inner presser foot alternating quantity and the outer presser foot alternating quantity are adjusted, the normal working process of the sewing machine is repeated.

Optionally, the sewing machine further comprises a motor for driving the rotation shaft 41 to rotate. Taking fig. 1 as an example, the motor drives the rotating shaft 41 to rotate clockwise, and the connecting sleeve 90 is driven to swing by the transmission connecting rod 44 and the limiting connecting rod 50, so as to drive the swinging member 31 to swing.

Optionally, the sewing machine further comprises a sensor in signal connection with the adjustment motor 60, the sensor being configured to detect a thickness of the cloth, so as to control the output shaft 61 of the adjustment motor 60 to rotate when the sensor detects an increase in the thickness of the cloth.

The application provides a sewing machine when making up leather or thick material, when meetting a certain section and making up the phenomenon that the surface fabric thickens suddenly, can adjust interior outer presser foot volume in turn through adjusting motor 60 in real time, the problem of the unable interior outer presser foot volume in turn of adjusting of sewing machine among the prior art has been solved. When the fabric with over-thick thickness or the fabric climbs a slope, the inner presser foot alternating quantity and the outer presser foot alternating quantity are increased by controlling the output shaft 61 of the adjusting motor 60 to rotate for a certain angle; when the thickness of the fabric returns to be normal, the output shaft 61 of the control adjusting motor 60 rotates to the initial position, and the inner presser foot and the outer presser foot alternate quantity are returned to the initial numerical value, so that the sewing is more convenient, the adjusting mode of the inner presser foot alternate quantity and the outer presser foot alternate quantity is simple and easy to operate, and the sewing machine provided by the application can realize the stepless adjustment of the inner presser foot alternate quantity and the outer presser foot alternate quantity.

When the output shaft 61 of the adjusting motor 60 rotates to the theoretically designed maximum angle, the adjusting block 70 rotates to the maximum rotation fixing position, so that the swing angle of the swing member 31 is adjusted to the maximum, and the alternating amount of the inner and outer presser feet is adjusted to the maximum.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

The relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

In the description of the present invention, it is to be understood that the orientation or positional relationship indicated by the orientation words such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc. are usually based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and in the case of not making a reverse description, these orientation words do not indicate and imply that the device or element being referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore, should not be considered as limiting the scope of the present invention; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.

Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and the terms have no special meanings unless otherwise stated, and therefore, the scope of the present invention should not be construed as being limited.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular is intended to include the plural unless the context clearly dictates otherwise, and it should be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of features, steps, operations, devices, components, and/or combinations thereof.

It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in sequences other than those illustrated or described herein.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A sewing machine, comprising:

a housing;

an outer presser foot (10), the outer presser foot (10) being movably arranged in a vertical direction;

an inner presser foot (20), wherein the inner presser foot (20) is movably arranged along the vertical direction;

a connecting assembly connected to both the outer presser foot (10) and the inner presser foot (20) and comprising an oscillating piece (31);

a drive structure (40), wherein the drive structure (40) is in drive connection with the swinging piece (31); the driving structure (40) drives the swinging piece (31) to swing, so that the inner presser foot (20) and the outer presser foot (10) move towards opposite directions under the driving of the connecting assembly;

the limiting connecting rod (50) is pivotally arranged in the machine shell, and the limiting connecting rod (50) is connected with the driving structure (40) and used for limiting the swinging piece (31) to swing within a preset angle;

wherein the rotation center of the limit link (50) is adjustable to adjust the size of the predetermined angle by adjusting the position of the rotation center of the limit link (50), thereby adjusting the amount of alternation between the inner presser foot (20) and the outer presser foot (10).

2. The sewing machine of claim 1, wherein the attachment assembly further comprises:

a first connecting rod (32), wherein a first end of the first connecting rod (32) is hinged with the swinging piece (31);

a mounting block (33), wherein the mounting block (33) is provided with three connecting ends arranged around the circumference of the mounting block, one connecting end of the mounting block (33) is hinged with the second end of the first connecting rod (32), and the other connecting end of the mounting block (33) is hinged with the top of the outer presser foot (10);

a second connecting rod (34), wherein a first end of the second connecting rod (34) is hinged with the other connecting end of the mounting block (33), and a second end of the second connecting rod (34) is hinged with the top of the inner presser foot (20).

3. The sewing machine of claim 1, further comprising:

the adjusting motor (60), the adjusting motor (60) is fixedly arranged in the shell;

an output shaft (61) of the adjusting motor (60) is in driving connection with a first end of the adjusting block (70), and the limiting connecting rod (50) is hinged with a second end of the adjusting block (70);

the adjusting block (70) is driven to rotate around the first end of the adjusting block (70) by controlling the output shaft (61) of the adjusting motor (60) to rotate, so that the position of the second end of the adjusting block (70) is changed, and the position of the rotating center of the limiting connecting rod (50) is changed.

4. Sewing machine as in claim 3, characterized in that said driving structure (40) comprises:

a rotating shaft (41), wherein the rotating shaft (41) is pivotably arranged in the machine shell;

the eccentric wheel (42), the said eccentric wheel (42) is fitted over the said spindle (41) and fixedly connected with said spindle (41);

a connecting piece (43), wherein the connecting piece (43) is in contact fit with the eccentric wheel (42);

the first end of the transmission connecting rod (44) is hinged to the connecting piece (43), the second end of the transmission connecting rod (44) is hinged to the swinging piece (31), and the limiting connecting rod (50) is hinged to the connecting piece (43);

the rotating shaft (41) drives the eccentric wheel (42) to synchronously rotate by taking the axis of the rotating shaft (41) as a rotating center, the connecting piece (43) moves under the pushing action of the eccentric wheel (42), the transmission connecting rod (44) moves along with the eccentric wheel (42) and drives the swinging piece (31) to swing, and the swinging piece (31) swings within a preset angle under the limiting action of the limiting connecting rod (50).

5. Sewing machine as in claim 4, characterized in that said connection element (43) comprises a connection ring, which is fitted over said eccentric (42), said first end of said transmission link (44) being hinged to the peripheral wall of said connection ring, said limit link (50) being hinged to the peripheral wall of said connection ring.

6. Sewing machine as in claim 5, characterized in that said driving structure (40) further comprises a bearing (110), said connecting ring being fitted over said eccentric (42) through said bearing (110).

7. The sewing machine according to claim 5, wherein the connecting member (43) further comprises a connecting projection connected to the outer peripheral wall of the connecting ring, the first end of the transmission link (44) is hinged to the connecting projection, and the stopper link (50) is hinged to the connecting projection.

8. The sewing machine of claim 7,

the adjusting block (70) is provided with a mounting groove (72), the connecting protrusion extends into the mounting groove (72), and the transmission connecting rod (44) and the limiting connecting rod (50) are both positioned in the mounting groove (72) and hinged with the connecting protrusion through a connecting pin;

the mounting groove (72) is provided with two groove walls arranged along the axial direction of the output shaft (61), and the connecting protrusion, the transmission connecting rod (44) and the limiting connecting rod (50) are clamped between the two groove walls to limit the connecting protrusion, the transmission connecting rod (44) and the limiting connecting rod (50) from moving along the axial direction of the output shaft (61).

9. Sewing machine as in claim 8, characterized in that said transmission links (44) are two, said connecting projection being located between said two transmission links (44), said two stop links (50) being two, said two transmission links (44) being located between said two stop links (50).

10. The sewing machine according to claim 3, wherein the adjusting block (70) is provided with a mounting hole (71), the adjusting block (70) is sleeved on the output shaft (61) through the mounting hole (71), the adjusting block (70) is provided with a first fixing hole which extends along the radial direction of the output shaft (61) and is communicated with the mounting hole (71), and the output shaft (61) is provided with a second fixing hole which extends along the radial direction of the output shaft (61); the sewing machine further includes:

the fixing piece (120) penetrates through the first fixing hole and the second fixing hole in sequence, so that the adjusting block (70) is fixedly connected with the output shaft (61).

11. The sewing machine of claim 3, further comprising:

the connecting shaft (80), the said connecting shaft (80) and said swing part (31) are fixedly connected;

the connecting sleeve (90), connecting sleeve (90) are including the connecting sleeve body and the bulge that are connected, pilot hole (91) have been seted up on the connecting sleeve body, the connecting sleeve body passes through pilot hole (91) cover is established on connecting axle (80), the second end of drive connecting rod (44) with the bulge is articulated.