CN115247320B

CN115247320B - Adjusting mechanism and sewing machine

Info

Publication number: CN115247320B
Application number: CN202110470168.9A
Authority: CN
Inventors: 田国兵
Original assignee: Jack Technology Co Ltd
Current assignee: Jack Technology Co Ltd
Priority date: 2021-04-28
Filing date: 2021-04-28
Publication date: 2023-06-20
Anticipated expiration: 2041-04-28
Also published as: CN115247320A

Abstract

The invention relates to an adjusting mechanism-level sewing machine. The adjusting mechanism is used for adjusting a differential adjusting mechanism and a stitch length adjusting mechanism of the sewing machine and is characterized by comprising a driving assembly, a differential adjusting assembly and a stitch length adjusting assembly, wherein the driving assembly is connected with a driving source of the sewing machine, the differential adjusting assembly is connected with the differential adjusting mechanism, the stitch length adjusting assembly is connected with the stitch length adjusting mechanism, and the driving assembly can selectively drive one of the differential adjusting assembly and the stitch length adjusting assembly so as to adjust the differential amount or the stitch length of the sewing machine. By arranging the adjusting mechanism, the sewing machine can independently and selectively control the differential adjusting mechanism or the stitch length adjusting mechanism to run by only arranging a single driving source through the adjusting mechanism, thereby being beneficial to the development of miniaturization and intellectualization of the sewing machine.

Description

Adjusting mechanism and sewing machine

Technical Field

The invention relates to the technical field of sewing equipment, in particular to an adjusting mechanism and a sewing machine.

Background

At present, the stitch length and differential adjustment of the sewing machine are generally realized through external adjusting spanners, and the positions of external spanners of different machine types are inconsistent, but the integral adjusting mode is realized through adjusting the positions of spanners and locking the positions of spanners. The existing scheme is generally realized by manual direct adjustment or by a stepping motor, and the functions of adjusting and maintaining the needle pitch are realized by the stepping motor.

But better sewing effect is achieved, and the cooperation of differential teeth is often needed, especially the sewing of elastic cloth. If the prior art scheme is adopted, at least two stepping motors are needed to realize the full automatic adjustment of the stitch length differential, and the installation of a plurality of motors is unfavorable for the development of the sewing machine towards the low-cost and miniaturized direction.

Disclosure of Invention

In view of the foregoing, it is desirable to provide an improved adjustment mechanism and sewing machine. The sewing machine is provided with the adjusting mechanism, so that only a single driving source is arranged, and the differential adjusting mechanism or the stitch length adjusting mechanism can be independently and selectively controlled to operate through the adjusting mechanism, thereby being beneficial to the development of the sewing machine in the miniaturized and intelligent directions.

The utility model provides an adjustment mechanism for adjust differential adjustment mechanism and needle pitch adjustment mechanism of sewing machine, adjustment mechanism includes drive assembly, differential adjustment subassembly and needle pitch adjustment subassembly, drive assembly connect in sewing machine's drive source, differential adjustment subassembly with differential adjustment mechanism connects, needle pitch adjustment subassembly with needle pitch adjustment mechanism connects, drive assembly can selectively drive differential adjustment subassembly or one of them of needle pitch adjustment subassembly, in order to adjust sewing machine's differential volume or needle pitch.

Further, the driving assembly comprises a first synchronous belt assembly and a second synchronous belt assembly,

the first synchronous belt assembly is respectively connected with the output end of the driving source and the differential adjusting assembly, and can drive the differential adjusting assembly along a first direction so as to drive the differential adjusting mechanism to operate;

the second synchronous belt assembly is respectively connected with the output end of the driving source and the needle distance adjusting assembly, and can drive the needle distance adjusting assembly along a second direction so as to drive the needle distance adjusting mechanism to operate.

Further, the first timing belt assembly includes:

the first driving wheel is connected with the output end of the driving source in a one-way and rotates along a first direction along with the driving source;

a first driven wheel connected to the differential adjustment assembly;

the first synchronous belt is connected with the first driving wheel and the first driven wheel and can drive the first driven wheel to rotate along a first direction under the rotation of the first driving wheel so as to drive the differential adjusting assembly.

Further, the first driven wheel comprises a first wheel part and a first one-way bearing, the first wheel part is connected to the output end of the driving source in a one-way mode through the first one-way bearing, and the first wheel part is connected with the first synchronous belt.

Further, the differential adjusting assembly includes:

a first connecting rod, one end of which is fixed on the first driven wheel,

one end of the first adjusting spanner is hinged to one end, relatively far away from the first driven wheel, of the first connecting rod, and the other end of the first adjusting spanner is in circumferential linkage with a differential adjusting shaft of the differential adjusting mechanism.

Further, the differential adjusting assembly further comprises a first reset piece, one end of the first reset piece is connected to one end, relatively close to the first connecting rod, of the first adjusting spanner, the other end of the first reset piece is connected to the frame of the sewing machine, the first reset piece is in a tensioning state, and the first reset piece is matched with the first one-way bearing and enables the first driven wheel to be in a locking state.

Further, the adjusting mechanism further comprises a first sensor, wherein the first sensor is used for detecting the rotation position of the first driven wheel and feeding back whether the rotation position is in the differential adjusting area or not.

Further, the first timing belt assembly includes:

the second driving wheel is connected with the output end of the driving source in a one-way and rotates along with the driving source in a second direction;

the second driven wheel is connected with the needle distance adjusting assembly; the method comprises the steps of,

The second synchronous belt is connected with the second driving wheel and the second driven wheel and can drive the second driven wheel to rotate along a second direction under the rotation of the second driving wheel so as to drive the needle pitch adjusting assembly.

Further, the second driven wheel comprises a second wheel part and a second one-way bearing, the second wheel part is connected to the output end of the driving source in a one-way mode through the second one-way bearing, and the second wheel part is connected with the second synchronous belt.

Further, the gauge needle adjusting assembly includes:

one end of the second connecting rod is fixed on the second driven wheel,

and one end of the second adjusting spanner is hinged to one end of the second connecting rod, which is relatively far away from the second driven wheel, and the other end of the second adjusting spanner is in circumferential linkage with the needle pitch adjusting shaft of the needle pitch adjusting mechanism.

Further, the stitch length adjusting assembly further comprises a second reset piece, one end of the second reset piece is connected to one end of the second adjusting wrench, which is relatively close to the second connecting rod, the other end of the second reset piece is connected to the frame of the sewing machine, the second reset piece is in a tensioning state, and the second reset piece is matched with the second one-way bearing and enables the second driven wheel to be in a locking state.

Further, the adjusting mechanism further comprises a second sensor, wherein the second sensor is used for detecting the rotation position of the second driven wheel and feeding back whether the rotation position is in the needle distance adjusting area or not.

An embodiment of the present invention further provides a sewing machine, including a driving source, a differential adjusting mechanism, and a stitch length adjusting mechanism, where the sewing machine further includes an adjusting mechanism as described in any one of the above.

Further, the differential adjusting mechanism includes:

a differential adjusting shaft, which is linked with the differential adjusting component in the circumferential direction;

a differential adjustment crank connected to the differential adjustment shaft;

a differential ratio fork hinged to the differential adjustment crank, the differential ratio fork being provided with a second arcuate slot;

the differential adjusting slide block is slidably arranged in the second arc-shaped groove and is provided with an arc surface matched with the second arc-shaped groove, and the differential adjusting slide block can slide relative to a differential crank of the sewing machine so as to adjust the effective cloth feeding radius of the differential crank of the sewing machine.

Further, the stitch length adjusting mechanism includes:

The needle distance adjusting shaft is in circumferential linkage with the needle distance adjusting assembly;

a stitch length adjusting crank connected to the stitch length adjusting shaft;

a feed ratio fork hinged to the gauge adjustment crank, the feed ratio fork being provided with a first arcuate slot;

the cloth feeding adjusting slide block is slidably arranged in the first arc-shaped groove and is provided with an arc surface matched with the first arc-shaped groove, and the cloth feeding adjusting slide block can slide relative to a cloth feeding crank of the sewing machine so as to adjust the effective cloth feeding radius of the cloth feeding crank of the sewing machine.

Further, the differential adjusting shaft and the gauge adjusting shaft are coaxially arranged and can rotate relatively.

Drawings

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

FIG. 2 is a schematic view of the sewing machine of FIG. 1 with parts omitted;

FIG. 3 is a schematic exploded view of the stitch length adjustment mechanism of the sewing machine of FIG. 2 with parts omitted;

FIG. 4 is a schematic exploded view of the differential adjustment mechanism of the sewing machine of FIG. 2 with parts omitted;

FIG. 5 is a schematic view of the structure of the adjusting mechanism of the sewing machine shown in FIG. 1;

FIG. 6 is a schematic view of the structure of the adjusting mechanism of the sewing machine shown in FIG. 5 with part of the elements omitted;

FIG. 7 is a partially disassembled schematic illustration of the adjustment mechanism of FIG. 6;

FIG. 8 is a schematic diagram of the adjustment mechanism of FIG. 5;

FIG. 9 is a schematic view of another part of the adjusting mechanism of the sewing machine shown in FIG. 5, with parts of the adjusting mechanism omitted;

fig. 10 is a schematic diagram of the adjustment mechanism of fig. 9.

Description of element reference numerals

100. A sewing machine; 10. a frame; 11. a cover plate; 12. a driving source; 20. a main shaft; 21. an eccentric wheel; 30. a transmission mechanism; 31. a first drive link; 32. a second drive link; 40. a cloth feeding mechanism; 41. a first shaft; 42. a first connecting crank; 43. a cloth feeding crank; 431. a first arc portion; 44. a cloth feeding slide block; 45. a cloth feeding connecting rod; 46. a feed dog frame; 47. a feed dog; 50. a needle pitch adjusting mechanism; 51. a cloth feeding adjusting slide block; 52. a feed ratio fork; 521. a first elongated slot; 522. a first arc-shaped groove; 53. a needle pitch adjusting crank; 54. a needle pitch adjusting shaft; 60. a differential mechanism; 61. a second shaft; 62. a second connecting crank; 63. a differential crank; 631. a second arc portion; 64. a differential slide block; 65. a differential link; 66. differential dental articulators; 67. differential teeth; 70. a differential adjustment mechanism; 71. a differential adjustment slider; 72. differential ratio fork; 721. a second elongated slot; 722. a second arc-shaped groove; 73. a differential adjustment crank; 74. a differential adjusting shaft; 80. an adjusting mechanism; 81. a drive assembly; 811. a first timing belt assembly; 8111. a first drive wheel; 81111. a first wheel section; 81112. a first one-way bearing; 8112. a first driven wheel; 8113. a first synchronization belt; 812. a second timing belt assembly; 8121. a second driving wheel; 81211. a second wheel section; 81212. a second one-way bearing; 8122. a second driven wheel; 8123. a second timing belt; 82. a differential adjustment assembly; 821. a first link; 822. a first adjustment wrench; 823. a first reset member; alpha, differential regulation zone; 83. a gauge needle adjusting assembly; 831. a second link; 832. a second adjusting spanner; 833. a second reset member; beta, stitch length adjusting area.

The foregoing general description of the invention will be described in further detail with reference to the drawings and detailed description.

Detailed Description

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

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

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

One embodiment of the present invention provides a sewing machine for forming one or more stitches on a material to be sewn, the machine interweaving or stitching one or more layers of material to be sewn.

Referring to fig. 1 to 5, fig. 1 is a schematic structural diagram of a sewing machine 100 according to an embodiment of the invention; FIG. 2 is a schematic view of the sewing machine 100 of FIG. 1 with parts omitted; FIG. 3 is a schematic exploded view of the stitch length adjustment mechanism 50 of the sewing machine 100 of FIG. 2 with parts omitted; fig. 4 is a schematic exploded view of the differential adjusting mechanism 70 of the sewing machine 100 shown in fig. 2 with parts omitted.

The sewing machine 100 includes a frame 10, a main shaft 20, a transmission mechanism 30, a cloth feeding mechanism 40, a stitch length adjusting mechanism 50, a differential mechanism 60, and a differential adjusting mechanism 70.

Of course, the sewing machine 100 may also include other mechanisms such as a thread cutting mechanism, a needle mechanism, etc. for assisting in completing the sewing operation of the sewing machine 100.

The spindle 20 is provided on the frame 10 so as to be rotatable about its own central axis, but not axially movable. Furthermore, the spindle 20 is provided with an eccentric 21 and a lifting slide (not shown), wherein the eccentric 21 is fixed relative to the spindle 20 and serves for the connection of the transmission mechanism 30, and the lifting slide is eccentrically articulated on the spindle 20 and supports the feed dog 46 and the differential dog 66 for the lifting movement in the vertical direction as the spindle 20 rotates. The tooth lifting sliding block can be axially limited through the check ring (not numbered) and the gasket (not numbered).

The transmission mechanism 30 is connected between the main shaft 20 and the cloth feeding mechanism 40, and between the main shaft 20 and the differential mechanism 60. The transmission mechanism 30 includes a first transmission link 31 and a second transmission link 32. Wherein the first end of the first transmission link 31 is sleeved on the eccentric wheel 21 and can rotate relative to the eccentric wheel 21, so that the first end and the second end of the first transmission link 31 are hinged to the first end of the second transmission link 32, and meanwhile, the second end of the first transmission link 31 is also connected to the differential mechanism 60. Further, a second end of the second transmission link 32 is connected to the cloth feed mechanism 40.

The cloth feeding mechanism 40 includes a first shaft 41 provided on the frame 10, the first shaft 41 being rotatable about its own axis but not movable in the axial direction. For this purpose, a sleeve (not numbered) is fixedly provided on the frame 10, and both ends of the first shaft 41 are respectively inserted into the sleeve, and are axially limited at each end by a retainer ring. The first shaft 41 is sleeved with a first connecting crank 42, and the first connecting crank 42 is fixed relative to the first shaft 41. The first connecting crank 42 is hinged to the second end of the second transmission link 32 by a pin (not numbered). The rotary motion of the main shaft 20 is transmitted to the first shaft 41 through the first and second transmission links 31 and 32, thereby driving the rotary motion of the first shaft 41.

A cloth feed crank 43 is fixedly provided on the first shaft 41. The cloth feed crank 43 has a first arc portion 431 extending in a direction away from the first shaft 41. The recess of the first arc portion 431 faces the axis of the feed shaft 20. A cloth feed slider 44 is slidably fitted over the first arc portion 431. The inner hole of the feed shoe 44 has a profile adapted to the curvature of the first arc portion 431. The cloth feeding slide block 44 is hinged with the first end of the cloth feeding connecting rod 45 through a pivot shaft, for example, the cloth feeding slide block 44 is provided with a first round platform which protrudes, and the first end of the cloth feeding connecting rod 45 is rotatably sleeved on the first round platform, so that the two are hinged; meanwhile, the second end of the feed link 45 is hinged to the feed dog frame 46 by a pivot shaft. Thus, the rotary movement of the first shaft 41 drives the feed dog 46 in the feed direction. The feed dog 46 is fixedly connected with a feed dog 47, and the feed dog 47 realizes active feed operation in the feed direction along with the movement of the feed dog 46.

The concave portion of the first arc portion 431 of the cloth feed crank 43 faces the cloth feed dog 46, and the center of the first arc portion 431 of the cloth feed crank 43 is located on the hinge axis between the cloth feed link 45 and the cloth feed dog 46, and at the same time, the radius of the first arc portion 431 of the cloth feed crank 43 is the same as the length between the two hinge ends of the cloth feed link 45, so that the position of the cloth feed dog 47 at the start of the cloth feed is always maintained regardless of the size of the gauge. When the cloth feeding starts, the cloth feeding crank 43 swings to the front limit position, and when the cloth feeding ends, the cloth feeding crank 43 swings to the rear limit position.

The stitch length adjusting mechanism 50 is connected to the feed mechanism 40 for adjusting the amount of movement of the feed dog frame 46 together with the feed dog 47 in the feed direction. In the stitch length adjusting mechanism 50, a feed adjusting slider 51 is hinged to the feed slider 44. For example, the feed slider 44 has a protruding second circular table, and the feed adjustment slider 51 is rotatably sleeved on the circular table to realize the hinge connection therebetween. The feed ratio fork 52 is connected to the feed adjustment slider 51. In the illustrated embodiment, the feed ratio fork 52 has a first elongated slot 521 and a first arcuate slot 522. The first shaft 41 is inserted into the first long groove 521, and the first shaft 41 is movable along the first long groove 521 with respect to the feed ratio fork 52. The feed ratio fork 52 is axially restrained by means of a feed crank 43 and a retainer ring (not numbered) fixedly fitted over the first shaft 41. In combination with the construction and cooperation of the feed ratio fork 52 and the feed adjustment slider 51 shown in the reference figures, the recess of the first arc-shaped groove 522 is directed toward the axis of the spindle 20, and the feed adjustment slider 51 is movably disposed in the first arc-shaped groove 522 along the first arc-shaped groove 522. The cloth feed adjusting slider 51 has an arc surface adapted to the shape of the first arc groove 522. The first end of the stitch length adjusting crank 53 is hinged with the end of the feed ratio fork 52 far from the first arc-shaped groove 522 through a pivot shaft, and the second end of the stitch length adjusting crank 53 is fixedly connected to the stitch length adjusting shaft 54. The stitch length adjusting shaft 54 is generally cylindrical, with one end fixedly connected to the second end of the stitch length adjusting crank 53 and the other end connected to the stitch length adjusting drive member.

The needle pitch adjustment shaft 54 is sleeved with a needle pitch adjustment sleeve (not numbered) which rotatably sets the needle pitch adjustment shaft 54 on the frame 10. In some embodiments, an oil-resistant measure, such as an O-ring, may be applied between the gauge adjustment shaft 54 and the gauge adjustment sleeve. The stitch length adjusting shaft 54 is connected to a stitch length adjusting driving member.

It is understood that, if the feed fork ratio does not penetrate the first shaft 41 and bends correspondingly to avoid the first shaft 41, the corresponding first long groove 521 may be omitted correspondingly.

The feeding process of the feeding mechanism 40 is specifically described below:

as shown in fig. 3, the rotary motion of the spindle 20 drives the first connecting crank 42 to swing rotationally through the eccentric wheel 21, the first transmission link 31 and the second transmission link 32, and then drives the feed crank 43 to swing through the first shaft 41, and the feed crank 43 drives the feed dog holder 46 to move in the feed direction together with the feed dog 47 through the feed slider 44 and the feed link 45. If it is desired to adjust the gauge, the gauge adjustment shaft 54 is rotated and the gauge adjustment shaft 54 is rotated to a predetermined angle to correspond to the position of a particular desired gauge. At this time, the stitch length adjusting crank 53 drives the feed ratio fork 52 to move upward or downward, and after the stitch length adjusting shaft 54 is fixed, the feed ratio fork 52 is also fixed at the adjusted position. The feed ratio fork 52 adjusts the positions of the feed slider 44 and the feed adjustment slider 51. Since the rotational swing amount of the first shaft 41 is not changed, but the distance between the hinge axis between the feed slider 44 and the feed link 45 and the central axis of the first shaft 41 (i.e., the effective feed radius of the feed crank 43) has been changed, the movement amount of the feed dog 46 in the feed direction along with the feed dog 47 is also changed, and finally, the adjustment of the needle pitch is achieved.

The differential mechanism 60 includes a second shaft 61 provided on the frame 10, the second shaft 61 being parallel to the first shaft 41 and rotatable about its own axis but not movable in the axial direction. For this purpose, a sleeve (not numbered) is fixedly provided on the frame 10, and both ends of the second shaft 61 are respectively inserted into the sleeve, and are axially restrained at each end by a retainer ring. The second shaft 61 is sleeved with a second connecting crank 62, and the second connecting crank 62 is fixed relative to the second shaft 61. The second connecting crank 62 is hinged to the second end of the first transmission link 31 by a pin. In the embodiment shown, the second connecting crank 62 and the first end of the second transmission link 32 are rotatably journalled on the same pivot axis and are hinged to the second end of the first transmission link 31 by means of the pivot axis, so that the rotary movement of the main shaft 20 brings about a synchronous rotary movement of the first shaft 41 and the second shaft 61 by means of the first transmission link 31 and the second transmission link 32.

As shown in fig. 4, a differential crank 63 is fixedly provided on the second shaft 61. The differential crank 63 has a second circular arc portion 631 extending in a direction away from the second shaft 61. The concave portion of the second circular arc portion 631 faces the axis of the main shaft 20. The differential slider 64 is slidably fitted over the second circular arc portion 631. The inner bore of the differential slide 64 has a profile that matches the curvature of the second arcuate portion 631. The differential sliding block 64 is hinged with the first end of the differential connecting rod 65 through a pivot shaft, for example, the differential sliding block 64 is provided with a protruding third round table, and the first end of the differential connecting rod 65 is rotatably sleeved on the third round table, so that the two are hinged; meanwhile, the second end of the differential link 65 is hinged to the differential dental bracket 66 by a pivot shaft. Thus, the differential carrier 66 can be driven to move in the feed direction by the rotational movement of the second shaft 61. The differential tooth frame 66 is fixedly connected with differential teeth 67, and the differential teeth 67 realize differential cloth feeding operation in the cloth feeding direction along with the movement of the differential tooth frame 66. As described above, the rotary motion of the spindle 20 drives the first shaft 41 and the second shaft 61 to synchronously rotate and oscillate, and simultaneously drives the feed crank 43 and the differential crank 63 to oscillate through the first shaft 41 and the second shaft 61, respectively, so as to drive the feed dog 46 and the differential dog 66 to move in the feed direction, respectively. The rotary motion of the spindle 20 drives the feed dog 46 and the differential dog 66 to perform the lifting motion in the vertical direction. The movement of the feed dog 46 and the differential dog 66 in the feed direction cooperates with the vertical feed lifting movement to achieve a complete feed path.

In the illustrated embodiment, the concave portion of the second circular arc portion 631 of the differential crank 63 faces the axis of the spindle 20, and the center of the second circular arc portion 631 of the differential crank 63 is located on the hinge axis between the differential link 65 and the differential carrier 66, while the radius of the second circular arc portion 631 of the differential crank 63 is the same as the length between the two hinge ends of the differential link 65, so that the position of the differential tooth 67 at the end of feeding is always maintained regardless of the differential distance.

In the illustrated embodiment, a differential adjustment mechanism 70 is connected to the differential mechanism 60 for adjusting the amount of movement of the differential carrier 66 in the feed direction along with the differential teeth 67. In the differential adjusting mechanism 70, a differential adjusting slider 71 is hinged to the differential slider 64. For example, the differential slide 64 has a protruding fourth circular table on which the differential adjusting slide 71 is rotatably sleeved to effect articulation therebetween. The differential ratio fork 72 is connected to the differential adjusting slider 71. In the illustrated embodiment, the differential ratio fork 72 has a second elongated slot 721 and a second arcuate slot 722. The second shaft 61 is disposed through the second elongated slot 721, and the second shaft 61 is movable along the second elongated slot 721 with respect to the differential ratio fork 72. The differential ratio fork 72 is axially restrained by means of a differential crank 63 and a retainer ring (not numbered) fixedly sleeved on the second shaft 61. The recess of the second arc-shaped groove 722 faces the second shaft 61, and the differential adjusting slider 71 is movably disposed in the second arc-shaped groove 722 along the second arc-shaped groove 722. The differential adjusting slider 71 has an arc surface adapted to the shape of the second arc groove 722. The structure of the differential ratio fork 72 and the differential adjusting slider 71 and the fitting manner thereof can be referred to as the structure of the feed ratio fork 52 and the feed adjusting slider 51 and the fitting manner thereof. The first end of the differential adjusting crank 73 is hinged to the end of the differential ratio fork 72 remote from the second arc-shaped groove 722 by a pivot shaft, and the second end of the differential adjusting crank 73 is formed with a cylindrical portion rotatably fitted over the stitch length adjusting shaft 54, the cylindrical portion being fixedly connected to the differential adjusting shaft 74.

In some embodiments, an oil-proof measure, such as an O-ring, may be applied between the barrel portion of the differential adjusting crank 73 and the stitch adjusting shaft 54. The differential adjusting shaft 74 has a substantially columnar shape, and has one end fixedly connected to the second end of the differential adjusting crank 73 and the other end connected to a differential-adjusting driving member.

It is understood that, in other embodiments, if the differential fork ratio does not penetrate the second shaft 61 and bends to avoid the second shaft 61, the corresponding second slot 721 may be omitted.

Further, the stitch length adjusting shaft 54 and the differential adjusting shaft 74 are coaxially sleeved with each other and can relatively rotate in order to save the installation space inside the sewing machine 100. Here, the differential adjustment shaft 74 may be sleeved on the stitch length adjustment shaft 54, or the stitch length adjustment shaft 54 may be sleeved on the differential adjustment shaft 74, so long as the stitch length adjustment crank 53 and the differential adjustment crank 73 can be driven separately.

The following describes the motion principle of the cloth feeding mechanism 40 and the differential mechanism 60 of the sewing machine 100:

as shown in fig. 2, the rotary motion of the main shaft 20 drives the second connecting crank 62 to swing through the eccentric wheel 21 and the first transmission connecting rod 31, and then drives the differential crank 63 to swing through the second shaft 61, and the differential crank 63 drives the differential tooth rack 66 and the differential tooth 67 to move in the feeding direction through the differential sliding block 64 and the differential connecting rod 65. If the differential distance (i.e., the movement gap between the differential teeth 67 and the feed teeth 47) needs to be adjusted, the differential adjusting shafts 74 are rotated to the proper positions by the driving components of differential adjustment, and different rotational positions of each differential adjusting shaft 74 correspond to different differential amounts. At this time, the differential adjusting crank 73 drives the differential ratio fork 72 upward or downward, and after the differential adjusting shaft 74 is fixed, the differential ratio fork 72 is also fixed in the adjusted position. The differential ratio fork 72 adjusts the positions of the differential slide 64 and the differential adjustment slide 71. Because the amount of swing of the second shaft 61 does not change, but the distance between the hinge axis between the differential slider 64 and the differential link 65 and the center axis of the second shaft 61 (i.e., the effective feed radius of the differential crank 63) has changed, the amount of movement of the differential dental frame 66 in the feed direction along with the differential teeth 67 will also change, eventually achieving differential adjustment.

The feed mechanism 40 and the differential mechanism 60 individually drive the operations of the feed dog 47 and the differential dog 67 through two different first shafts 41 and second shafts 61, respectively, so that the above-described amounts of difference and the pitches can be individually adjusted by different mechanisms, respectively. Therefore, if the differential adjusting mechanism 70 and the stitch length adjusting mechanism 50 are appropriately driven by the driving source 12 for electrically controlling the mechanisms, the development of the sewing machine is facilitated in the direction of intelligence. However, if the driving sources are respectively attached to the different mechanisms, the sewing machine is disadvantageous in terms of downsizing and cost reduction.

Referring to fig. 6 to 10 together, fig. 6 is a schematic structural view of the adjusting mechanism 80 of the sewing machine 100 shown in fig. 5, in which part of the components are omitted; FIG. 7 is a partially disassembled schematic illustration of the adjustment mechanism 80 of FIG. 6; FIG. 8 is a schematic diagram of the adjustment mechanism 80 shown in FIG. 5; fig. 9 is a schematic view of another part of the adjusting mechanism 80 of the sewing machine 100 shown in fig. 5, in which part of the components are omitted; fig. 10 is a schematic diagram of the adjusting mechanism 80 shown in fig. 9.

In order to solve the above-described problem, the sewing machine 100 further includes a driving source 12 and an adjusting mechanism 80, as shown in fig. 1. The adjusting mechanism 80 is selectively connected to the differential adjusting mechanism 70 or the stitch length adjusting mechanism 50, so that the sewing machine 100 can adjust the difference and the stitch length by providing only a single driving source 12. When the separate driving source 12 is adopted, in order to make the adjustment of the difference and the stitch length in the adjustment process be two mutually independent processes (the adjustment of the difference can only realize the adjustment of the gap between the feed dog 47 and the differential dog 67, and the adjustment of the gap can not influence the stitch length), the invention can only be realized by designing a specific mechanical structure, and the mechanical structure in the existing sewing machine can not realize the separate adjustment function.

In the present embodiment, the driving source 12 may be a driving device such as a stepping motor having a horsepower level adapted.

As shown in fig. 6, the adjustment mechanism 80 includes a drive assembly 81, a differential adjustment assembly 82, and a stitch length adjustment assembly 83. The driving assembly 81 is connected to an output of the driving source 12. The differential adjustment assembly 82 is circumferentially coupled to the differential adjustment shaft 74 and is capable of driving rotation of the differential adjustment shaft 74. The stitch length adjusting assembly 83 is circumferentially interlocked with the stitch length adjusting shaft 54 and is capable of driving the stitch length adjusting shaft 54 to rotate. The driving unit 81 is connected to the differential adjusting unit 82 and the gauge adjusting unit 83, and is capable of selectively driving one of the differential adjusting unit 82 and the gauge adjusting unit 83 to adjust the differential amount or the gauge. Here, the driving unit 81 and the differential adjusting unit 82 serve as driving members of the differential adjusting mechanism 70; and drive assembly 81 and stitch length adjustment assembly 83 serve as the drive components of stitch length adjustment mechanism 50.

It should be explained that: the circumferential linkage between the differential adjusting assembly 82 and the differential adjusting shaft 74 means that the outer circumference of the differential adjusting shaft 74 and the differential adjusting assembly 82 form a linkage relationship, for example, the differential adjusting assembly 82 can drive the differential adjusting shaft 74 to rotate around its own axis by fixing part of the elements of the differential adjusting assembly 82 and the outer circumference of the differential adjusting shaft 74, and the rotation of the differential adjusting shaft 74 can also correspondingly cause the movement of the differential adjusting assembly 82. The circumferential linkage action between the stitch length adjustment assembly 83 and the stitch length adjustment shaft 54 is similar.

The drive assembly 81 includes a first timing belt assembly 811 and a second timing belt assembly 812. The first timing belt assembly 811 is connected to the output of the drive source 12 and the differential adjusting assembly 82, respectively. The second timing belt assemblies 812 are respectively connected to the output end of the driving source 12 and the stitch length adjusting assembly 83. The first timing belt assembly 811 and the second timing belt assembly 812 are connected to the output end of the driving source 12, respectively. The output of the drive source 12 is capable of driving the first timing belt assembly 811 in a first direction and the second timing belt assembly 812 in a second direction, thereby enabling independent adjustment of the two corresponding mechanisms. In the present embodiment, the first direction and the second direction are two opposite rotational directions.

It will be appreciated that in other embodiments, if the output end is provided with a cam member, the first timing belt 8113 and the second timing belt 8123 can be connected to different regions of the cam member, so as to achieve the purpose of separate driving, and in this case, the first direction and the second direction may be the same rotation direction.

In the present embodiment, the differential adjusting mechanism 70 and the stitch length adjusting mechanism 50 are adjusted in similar manners (the rotational directions or the adjusting process are substantially the same), and it is not easy to operate the differential adjusting unit 82 and the stitch length adjusting unit 83 by driving the driving source 12 in different rotational directions independently.

In one embodiment, as shown in fig. 7 and 8, the first timing belt assembly 811 includes a first drive pulley 8111, a first driven pulley 8112, and a first timing belt 8113. The first driving wheel 8111 is unidirectionally connected to an output end of the driving source 12, and rotates along a first direction along with the driving source 12. First driven wheel 8112 is coupled to differential adjustment assembly 82. The first timing belt 8113 is connected to the first driving pulley 8111 and the first driven pulley 8112, and is capable of driving the first driven pulley 8112 to rotate under the rotation of the first driving pulley 8111. The first capstan 8111 serves as an active driving member for outputting power of the driving source 12. First driven wheel 8112 is configured to correspondingly rotate with first driving wheel 8111 and transmit power to differential adjustment assembly 82. The first timing belt 8113 is used to transmit power of the first driving pulley 8111 to the first driven pulley 8112. The first direction is a counterclockwise direction indicated by an arrow F1 in fig. 8.

In one embodiment, as shown in fig. 9, the second timing belt assembly 812 includes a second drive pulley 8121, a second driven pulley 8122, and a second timing belt 8123. The second driving wheel 8121 is unidirectionally connected to the output end of the driving source 12, and rotates along the second direction along with the driving source 12. Second driven wheel 8122 is coupled to stitch length adjustment assembly 83. The second timing belt 8123 is connected to the second driving wheel 8121 and the second driven wheel 8122, and can drive the second driven wheel 8122 to rotate under the rotation of the second driving wheel 8121. The second driving wheel 8121 serves as an active driving member for outputting power of the driving source 12. Second driven wheel 8122 is configured to correspondingly rotate with second driving wheel 8121 and transmit power to stitch control assembly 83. The second timing belt 8123 is used to transmit power of the second driving wheel 8121 to the second driven wheel 8122. The second direction is clockwise as indicated by arrow F2 in fig. 10.

The first driving wheel 8111 and the second driving wheel 8121 are stacked along the axial direction of the output end, so when the first driving wheel 8111 and the second driving wheel 8121 are respectively connected to the output end along two directions, the driving source 12 controls the unidirectional rotation of the output end to only enable the first driving wheel 8111 or the second driving wheel 8121 to rotate, thereby realizing the selective driving of the differential adjusting assembly 82 or the stitch length adjusting assembly 83.

Further, the first driving wheel 8111 includes a first wheel portion 81111 and a first one-way bearing 81112. The first wheel portion 81111 is connected to the first driven wheel 8112 by a first timing belt 8113, and the first wheel portion 81111 is unidirectionally connected to an output end of the driving source 12 by a first unidirectional bearing 81112. When the driving source 12 controls the output end to rotate counterclockwise, the output end can drive the first wheel portion 81111 along the first direction through the first one-way bearing 81112, and then transmit the rotating power to the first driven wheel 8112 through the first synchronous belt 8113; when the drive source 12 controls the output end to rotate clockwise, the first wheel portion 81111 cannot be driven to operate due to the restriction of the first one-way bearing 81112, and the output end only idles with respect to the first wheel portion 81111.

Similarly, the second driving wheel 8121 includes a second wheel portion 81211 and a second one-way bearing 81212. The connection between the second wheel portion 81211 and the second one-way bearing 81212, and between the output end and the second timing belt 8123 is similar, except that: the second wheel portion 81211 is reversely connected to the output end of the driving source 12 through a second one-way bearing 81212. When the driving source 12 controls the output end to rotate clockwise, the output end can drive the second wheel portion 81211 along the second direction through the second one-way bearing 81212, and then transmit the rotating power to the second driven wheel 8122 through the second synchronous belt 8123; when the driving source 12 controls the output end to rotate counterclockwise, the second wheel 81211 cannot be driven to operate due to the restriction of the second one-way bearing 81212, and the output end only idles with respect to the second wheel 81211. At this time, the counterclockwise movement of the output end drives the first wheel portion 81111 to rotate.

The first driven wheel 8112 and the second driven wheel 8122 are rotatably connected to the head cover 11 of the frame 10.

The driving source 12 unidirectionally drives the first timing belt assembly 811 or the second timing belt assembly 812 to operate, thereby achieving the purpose of individually adjusting the amount of difference or the gauge.

The differential adjustment assembly 82 includes a first link 821 and a first adjustment wrench 822. The first link 821 is eccentrically fixed to an end surface of the first driven wheel 8112, and the other end is hinged to a first adjustment wrench 822. The first adjusting wrench 822 is connected to an end of the differential adjusting shaft 74 relatively far from the differential adjusting crank 73, and is circumferentially interlocked with the differential adjusting shaft 74. The first link 821 forms a movement pattern similar to a crank-rocker mechanism with the first adjustment wrench 822 under the action of the first driven wheel 8112. When the first driven wheel 8112 rotates, the connecting end of the first connecting rod 821 eccentrically rotates around the rotation center of the first driven wheel 8112, so as to drive the first connecting rod 821 to move towards or away from the center of the first driving wheel 8111, and further toggle the first adjusting wrench 822 to rotate around the axis of the differential adjusting shaft 74; rotation of the first adjustment wrench 822 can drive the differential adjustment shaft 74 to rotate about its own axis, thereby driving the differential adjustment crank 73 to rotate, and adjusting the position of the differential adjustment slider 71 through the differential ratio fork 72 to further adjust the position of the differential slider 64 in the second circular arc portion 631. The rotational positions of first driven wheel 8112 can correspond to the rotational positions of differential adjustment shaft 74, respectively, so that adjustment of the amount of difference can correspond to the rotational positions of first driven wheel 8112.

In one embodiment, the differential adjustment assembly 82 further includes a first reset member 823. Both ends of the first restoring member 823 act on the first adjusting spanner 822 and the head cover 11 of the sewing machine 100, respectively. The first restoring member 823 is always in a tensed state. As shown in fig. 8, the first adjusting wrench 822 always has a pulling force in the direction S1 in fig. 8 by the elastic action of the first restoring member 823; the combined action of first one-way bearing 81112 and first reset element 823 enables first timing belt assembly 811 to be in a locked state as long as the rotational position of first driven wheel 8112 is within differential adjustment region α; at this time, the output end can be in a non-forced stop state. By the arrangement, the output end of the driving source 12 can be free from being in a state of always exerting force in the differential quantity adjusting process, so that the heat generation defect caused by the fact that the motor is always in a running state of exerting force in the prior art is avoided.

Preferably, first driven wheel 8112 is provided with a first inductor (not shown). The first sensor is used to detect and feed back the rotational position of the first driven wheel 8112. The rotation position information is transmitted to a data center and compared with the final value of the differential quantity adjustment, and if the rotation position information and the final value are consistent, the first driven wheel 8112 stops rotating; if the two are inconsistent, the driving source 12 drives the first driven wheel 8112 to rotate along the first direction, and makes the first driven wheel 8112 rotate to a specific rotation position corresponding to the preset difference. Further, the first sensor can also determine whether the first driven wheel 8112 is within the differential adjustment region α, thereby ensuring that the first timing belt assembly 811 is in a locked state.

Similarly, gauge adjustment assembly 83 includes a second link 831 and a second adjustment wrench 832. The second connecting rod 831 is eccentrically fixed on the end surface of the second driven wheel 8122, and the other end is hinged with the second adjusting spanner 832. The manner in which the pitch adjustment assembly 83 is connected to and operates the second timing belt assembly 812 is substantially the same as the manner in which the differential adjustment assembly 82 is connected to and operates the first timing belt assembly 811, and will not be described in detail herein. The rotational positions of second driven wheel 8122 can correspond to the rotational positions of needle pitch adjustment shaft 54, respectively, so that the adjustment of the needle pitch can correspond to the rotational positions of second driven wheel 8122.

In one embodiment, the stitch length adjustment assembly 83 further includes a second reset member 833. Both ends of the second restoring member 833 elastically act on the second adjusting wrench 832 and the head cover 11 of the sewing machine 100, respectively. The second restoring member 833 is always in a tensed state. As shown in fig. 10, the second adjusting wrench 832 always has a pulling force in the direction S2 in fig. 10 by the elastic action of the second restoring member 833; as long as the rotational position of the second driven wheel 8122 is within the gauge adjustment region β, the combined action of the second one-way bearing 81212 and the second reset 833 can put the second timing belt assembly 812 in a locked state; at this time, the output end can be in a non-forced stop state. By the arrangement, the output end of the driving source 12 can be free from being in a state of always exerting force in the process of adjusting the needle distance, so that the heat generation defect caused by the fact that the motor is always in a running state of exerting force in the prior art is avoided.

Preferably, a second inductor (not shown) is provided on second driven wheel 8122. The second sensor is used to detect and feed back the rotational position of the second driven wheel 8122. The rotation position information is transmitted to a data center and compared with the final value of the stitch length adjustment, and if the two values are consistent, the second driven wheel 8122 stops rotating; if the two are inconsistent, the driving source 12 drives the second driven wheel 8122 to rotate along the second direction, and the second driven wheel 8122 rotates to a specific rotation position corresponding to the preset needle pitch. In addition, the second sensor can also determine whether the second driven wheel 8122 is within the gauge adjustment region β, thereby ensuring that the second timing belt assembly 812 is in a locked state.

The process of adjusting the amount of difference or gauge of the adjustment mechanism 80 is specifically described below:

when the output end of the driving source 12 rotates counterclockwise and drives the first wheel portion 81111 to rotate under the action of the first unidirectional bearing 81112, the first wheel portion 81111 drives the first driven wheel 8112 to rotate counterclockwise through the first synchronous belt 8113 and drives the first link 821 to eccentrically rotate in the first direction; the eccentric rotation of the first link 821 rotates the first adjustment wrench 822 with respect to the axis of the differential adjustment shaft 74 and drives the differential adjustment shaft 74 to rotate to adjust the position of the differential adjustment slider 71. In this process, if the first sensor detects that the rotational position of the first driven wheel 8112 is in the differential adjustment region α, two opposite forces of the first resetting member 823 and the first one-way bearing 81112 act on the first driven wheel 8112, and the first driven wheel 8112 is in a locked state. If the first sensor detects that the rotational position of the first driven wheel 8112 is not within the differential adjustment region α, the driving source 12 drives the first wheel portion 81111 to rotate into the differential adjustment region α.

The driving source 12 drives the stitch length adjusting assembly 83 through the second timing belt assembly 812 to operate in the same manner as the differential adjusting assembly 82 described above, but in the opposite direction, which is not described herein.

An embodiment of the present invention provides a sewing machine. The sewing machine is provided with the adjusting mechanism, so that only a single driving source is arranged, and the differential adjusting mechanism or the stitch length adjusting mechanism can be independently and selectively controlled to operate through the adjusting mechanism, thereby being beneficial to the development of the sewing machine in the miniaturized and intelligent directions.

The technical features of the above-described embodiments may be combined in any manner, and for brevity, all of the possible combinations of the technical features of the above-described embodiments are not described, however, all of the combinations of the technical features should be considered as being within the scope of the present disclosure as long as there is no contradiction between the combinations of the technical features.

The above embodiments represent only a few embodiments of the present invention, which are described in more detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.

Claims

1. An adjusting mechanism for adjusting a differential adjusting mechanism and a stitch length adjusting mechanism of a sewing machine is characterized in that the adjusting mechanism comprises a driving component, a differential adjusting component and a stitch length adjusting component, wherein the driving component is connected with a driving source of the sewing machine, the differential adjusting component is connected with the differential adjusting mechanism, the stitch length adjusting component is connected with the stitch length adjusting mechanism, the driving component is used for being connected with an independent driving source and comprises a first unidirectional bearing and a second unidirectional bearing,

the driving assembly is connected to the output end of the driving source through the first one-way bearing and connected to the output end of the driving source through the second one-way bearing, so that the driving assembly can selectively drive one of the differential adjusting assembly and the stitch length adjusting assembly to adjust the differential amount or the stitch length of the sewing machine.

2. The adjustment mechanism of claim 1, wherein the drive assembly comprises a first timing belt assembly and a second timing belt assembly,

3. The adjustment mechanism of claim 2, wherein the first timing belt assembly comprises:

a first driven wheel connected to the differential adjustment assembly;

4. An adjustment mechanism as set forth in claim 3 wherein said first driven wheel includes a first wheel portion and said first one-way bearing, said first wheel portion being unidirectionally connected to an output of said drive source via said first one-way bearing, and said first wheel portion being connected to said first timing belt.

5. The adjustment mechanism of claim 4, wherein the differential adjustment assembly comprises:

A first connecting rod, one end of which is fixed on the first driven wheel,

6. An adjustment mechanism as recited in claim 5, further comprising a first return member having one end connected to an end of the first adjustment wrench that is relatively closer to the first link and another end connected to a frame of the sewing machine, the first return member being in tension and the first return member engaging the first one-way bearing and locking the first driven wheel.

7. The adjustment mechanism of claim 6, further comprising a first sensor for detecting a rotational position of the first driven wheel and feeding back whether the rotational position is within a differential adjustment zone.

8. The adjustment mechanism of claim 2, wherein the first timing belt assembly comprises:

9. The adjustment mechanism of claim 8, wherein the second driven wheel includes a second wheel portion and the second one-way bearing, the second wheel portion is unidirectionally connected to the output end of the drive source through the second one-way bearing, and the second wheel portion is connected to the second timing belt.

10. The adjustment mechanism of claim 9, wherein the stitch length adjustment assembly comprises:

one end of the second connecting rod is fixed on the second driven wheel,

11. The adjustment mechanism of claim 10, wherein the stitch length adjustment assembly further comprises a second return member having one end connected to an end of the second adjustment wrench that is relatively close to the second link and another end connected to the frame of the sewing machine, the second return member being in tension and the second return member engaging the second one-way bearing and locking the second driven wheel.

12. The adjustment mechanism of claim 11, further comprising a second sensor for detecting a rotational position of the second driven wheel and feeding back whether the rotational position is within a stitch adjustment zone.

13. A sewing machine comprising a drive source, a differential adjustment mechanism, and a stitch length adjustment mechanism, wherein the sewing machine further comprises an adjustment mechanism as claimed in any one of claims 1 to 12.

14. The sewing machine of claim 13, wherein the differential adjustment mechanism comprises:

a differential adjustment crank connected to the differential adjustment shaft;

15. The sewing machine of claim 14, wherein the stitch length adjustment mechanism comprises:

a stitch length adjusting crank connected to the stitch length adjusting shaft;

16. The sewing machine of claim 15, wherein the differential adjustment shaft and the stitch length adjustment shaft are coaxially disposed and rotatable relative to each other.